JP2018048297A - Coke strength estimation method - Google Patents
Coke strength estimation method Download PDFInfo
- Publication number
- JP2018048297A JP2018048297A JP2017083895A JP2017083895A JP2018048297A JP 2018048297 A JP2018048297 A JP 2018048297A JP 2017083895 A JP2017083895 A JP 2017083895A JP 2017083895 A JP2017083895 A JP 2017083895A JP 2018048297 A JP2018048297 A JP 2018048297A
- Authority
- JP
- Japan
- Prior art keywords
- coal
- inferior
- fracture strength
- caking
- specific volume
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Coke Industry (AREA)
Abstract
【課題】劣質炭を配合した配合炭を用いて製造するコークスの表面破壊強度を正確に推定する方法を提供する。【解決手段】コークスの表面破壊強度の推定方法において、用いる配合炭は、ビトリニット平均反射率０.８％以上、全膨張率０％超の粘結炭と、ビトリニット平均反射率０.８％未満、全膨張率０％超の非微粘結炭と、全膨張率０％の劣質炭とからなり、粘結炭の空隙充填度を用いて粘結炭に基づく表面破壊強度を推定し、劣質な石炭の空隙充填度を用いて劣質な石炭に基づく表面破壊強度を推定し、劣質炭の高速昇温膨張比容積と配合率を求め、高速昇温膨張比容積及び配合率を強度発現阻害要因とする劣質炭に関する粒子間接着影響の関係から補正値を求め、粘結炭に基づく表面破壊強度の推定値と補正値で補正した劣質な石炭に基づく表面破壊強度の推定値とを粘結炭と劣質な石炭の配合率で加重平均することを特徴とするコークス表面破壊強度の推定方法。【選択図】図５A method for accurately estimating the surface fracture strength of coke produced using blended coal blended with inferior coal is provided. In the method for estimating the surface fracture strength of coke, the blended coal used is caking coal with a vitrinite average reflectance of 0.8% or more and a total expansion coefficient of more than 0%, and a vitrinite average reflectance of less than 0.8%. The non-slightly caking coal with a total expansion rate of over 0% and the inferior quality coal with a total expansion rate of 0%, and the surface fracture strength based on the caking coal is estimated by using the degree of void filling of the caking coal. The surface fracture strength based on inferior coal is estimated using the degree of void filling of the inferior coal, and the high temperature temperature expansion and expansion specific volume and compounding rate of the inferior coal are obtained. The correction value is obtained from the relationship between the interparticle adhesion effects on the inferior coal, and the estimated value of the surface fracture strength based on the caking coal and the estimated value of the surface fracture strength based on the inferior coal corrected by the correction value are caking. Coke table characterized by weighted average with blending ratio of low quality and poor quality coal Estimation method of breaking strength. [Selection] Figure 5
Description
本発明は、膨張性を有さない劣質炭が配合された配合炭を用いて製造される高炉用コークスの強度を推定する方法に関する。 The present invention relates to a method for estimating the strength of blast furnace coke produced using blended coal blended with inferior quality coal having no expansibility.
高炉の通気性を確保し、安定的に操業するために、高炉で用いられるコークスには、所要の強度が求められる。近年、高炉容積の大型化やＣＯ2削減を目指して低還元材比で操業するために、益々高強度のコークスが求められている。 Coke used in the blast furnace is required to have a required strength in order to ensure the air permeability of the blast furnace and operate stably. In recent years, coke with higher strength has been demanded in order to operate with a low reducing material ratio in order to increase the blast furnace volume and reduce CO 2 .
高炉用コークスを製造する際には、多種多様な銘柄の石炭を配合した原料石炭（配合炭）をコークス炉内に装入し、乾留する。コークス炉の中で加熱された配合炭は、３５０〜５００℃の温度域で一旦軟化溶融・膨張して、石炭粒子同士が結合した後、再度固化することで、コークスを生成する。 When producing coke for blast furnace, raw coal (mixed coal) containing various brands of coal is charged into the coke oven and dry-distilled. The coal blend heated in the coke oven is once softened, melted and expanded in a temperature range of 350 to 500 ° C., and coal particles are combined and then solidified again to generate coke.
石炭が軟化溶融する性質のことを粘結性といい、配合炭は、通常、粘結性の高い石炭（粘結炭）と粘結性の低い石炭（非微粘結炭）が十数種類配合された構成となっている。なお、粘結炭は高石炭化度炭であり、非微粘結炭は全てが低石炭化度炭とは限らないが、低石炭化度炭が多い。 The property that coal softens and melts is called caking, and blended coal usually contains more than 10 types of coal with high caking properties (caking coal) and coal with low caking properties (non-caking coal). It has been configured. In addition, caking coal is a high coal degree coal, and all the non-slightly caking coal is not necessarily a low coal degree coal, but there are many low coal degree coals.
強度の高いコークスを製造するには、配合炭に一定の粘結性が必要とされることから、粘結炭を多く配合することが必要である。しかし、良質な粘結炭は高価であり、また資源的に枯渇状態にあるのに対して、粘結性の劣る非微粘結炭は、埋蔵量が豊富であり、安価に入手できることから、非微粘結炭の配合率を高くすることが望まれている。更に、より劣質な非微粘結炭を配合する傾向が近年強まっている。 In order to produce coke with high strength, it is necessary to mix a large amount of caking coal, since a certain caking property is required for the blended coal. However, high-quality caking coal is expensive and resource-depleted, whereas non-minor caking coal with poor caking properties is rich in reserves and available at low cost. It is desired to increase the blending ratio of non-slightly caking coal. Furthermore, the tendency to mix | blend a more inferior non-slightly caking coal is increasing in recent years.
しかし、粘結性に乏しい非微粘結炭を配合すると、上記のコークス化機構から理解されるように、石炭粒子の膨張及び結合が不十分となり、コークス強度の低下を招く。コークス強度の低下は、高炉操業に多大なる影響を及ぼすため、配合する石炭の性状から事前にコークス強度を予測する技術は、粘結性に乏しい非微粘結炭を配合する、現在の石炭配合事情において非常に重要である。 However, when non-slightly caking coal with poor caking properties is blended, as understood from the coking mechanism described above, expansion and bonding of the coal particles become insufficient, leading to a reduction in coke strength. Since the reduction of coke strength has a significant effect on blast furnace operation, the technology for predicting coke strength in advance from the properties of coal to be blended is to blend non-slightly caking coal with poor caking properties. Very important in circumstances.
一方、コークス強度の指標として、ＪＩＳ Ｋ２１５１に記載のドラム強度が使用されている。ドラム強度は、所定量のコークス（１０ｋｇ）を装入した回転ドラムを１５０回転させた後、篩目１５ｍｍの篩でふるい分けた篩上（粒径１５ｍｍ超）のコークス質量の全装入コークス質量に対する百分率（１５ｍｍ指数）で評価するものであり、ＤＩ150 15と表記している。 On the other hand, the drum strength described in JIS K2151 is used as an index of coke strength. The drum strength was determined by rotating the rotating drum charged with a predetermined amount of coke (10 kg) 150 times and then sieving with a sieve having a sieve size of 15 mm on the sieve (particle size exceeding 15 mm) with respect to the total charged coke mass. It is evaluated as a percentage (15 mm index) and is expressed as DI 150 15 .
また、ドラム回転時に発生する篩目１５ｍｍの篩でふるい分けた篩下（粒径１５ｍｍ以下）の粉には、表面破壊により生成する粉（表面破壊粉：粒径６ｍｍ以下）及び体積破壊により生成する粉（体積破壊粉：粒径６−１５ｍｍ）が混在していることも明らかにされている。 In addition, the powder under the sieve (particle size of 15 mm or less) screened with a sieve having a mesh size of 15 mm generated when the drum rotates is generated by surface destruction (surface destruction powder: particle diameter of 6 mm or less) and volume destruction. It has also been clarified that powder (volume fracture powder: particle size 6-15 mm) is mixed.
表面破壊は、平均粒度１ｍｍ程度に粉砕された原料石炭の軟化溶融・膨張が不十分なことに起因し、原料石炭の粒子同士の不完全な接着や、装炭時の原料石炭の粒子間空隙の不十分な充填が、欠陥としてコークス中に残存することにより生じる。また、体積破壊は、コークス全体の収縮の不均一さから発生する熱応力によって生成する亀裂により生じ、その生成量は、コークス炉内の温度分布やコークス収縮係数（単位温度あたりの収縮量の大小）に影響される。 Surface destruction is caused by insufficient softening, melting and expansion of raw coal pulverized to an average particle size of about 1 mm, and incomplete adhesion between raw coal particles and inter-particle voids in raw coal during coal loading. Insufficient filling is caused by remaining in the coke as defects. In addition, volume fracture is caused by cracks generated by thermal stress generated from non-uniform shrinkage of the entire coke, and the amount of generation is determined by the temperature distribution in the coke oven and the coke shrinkage coefficient (the amount of shrinkage per unit temperature is small or large). ).
このような、表面破壊に関する強度（表面破壊強度）及び体積破壊に関する強度（体積破壊強度）を個々に求めることで、コークス強度ＤＩ150 15を推定する方法が知られている。
例えば、特許文献１には、石炭の膨張比容積と装入嵩密度から石炭軟化溶融時の空隙充填度を求め、この空隙充填度からコークスの表面破壊強度を推定する方法が開示されている。また、コークスの表面破壊強度を推定するに際し、石炭軟化時の膨張比容積は、配合炭の場合、各石炭の実測値の加重平均値を用いればよいとされている。
There is known a method for estimating the coke strength DI 150 15 by individually obtaining the strength related to surface fracture (surface fracture strength) and the strength related to volume fracture (volume fracture strength).
For example, Patent Document 1 discloses a method for obtaining the degree of void filling at the time of coal softening and melting from the expansion specific volume and charging bulk density of coal and estimating the surface fracture strength of coke from this degree of void filling. Moreover, when estimating the surface fracture strength of coke, it is said that the weighted average value of the measured values of each coal may be used as the expansion specific volume during coal softening in the case of blended coal.
なお、表面破壊強度とは、ドラム強度の６ｍｍ指数（ＤＩ150 6）、すなわちドラムを１５０回転させた後の篩目６ｍｍの篩でふるい分けた篩上（粒径６ｍｍ超）のコークス質量の全装入コークス質量に対する百分率である。以下では、表面破壊強度をＤＩ150 6と表記することがある。 The surface breaking strength is the drum strength 6 mm index (DI 150 6 ), that is, the total amount of coke mass on the sieve (particle size greater than 6 mm) sieved with a 6 mm sieve after rotating the drum 150 times. It is a percentage of the incoming coke mass. Hereinafter, the surface fracture strength may be expressed as DI 150 6 .
しかしながら、非微粘結炭の配合割合が増大すると、石炭の膨張比容積には加成性が成立しないため、特許文献１に開示の方法では、十分な正確性で表面破壊強度を推定できないことがあった。 However, if the blending ratio of non-slightly caking coal increases, additivity is not established in the expansion specific volume of coal, and therefore the method disclosed in Patent Document 1 cannot estimate the surface fracture strength with sufficient accuracy. was there.
そこで、特許文献２では、高石炭化度炭（粘結炭）と、低石炭化度炭（非微粘結炭）のそれぞれに基づく表面破壊強度を、それぞれの膨張比容積と装入嵩密度から推定し、これらを高石炭化度炭と低石炭化度炭の配合割合で加重平均することにより、コークスの表面破壊強度を推定する方法が開示されている。 Therefore, in Patent Document 2, the surface fracture strength based on each of high-coalized coal (caking coal) and low-coalizing coal (non-caustic coal) is used as the expansion specific volume and charging bulk density. And a method for estimating the surface fracture strength of coke by weighting and averaging these at a blending ratio of high- and low-carbonized coals.
また、特許文献３では、膨張性を有しない低石炭化度炭を配合炭の一部に用いて製造するコークスの表面破壊強度の推定をするにあたり、３℃／分以上の昇温速度で測定した低石炭化度炭の膨張比容積の値を用いて粘結炭の表面破壊強度に関するイナートファクターを求め、これを用いて粘結炭の表面破壊強度の推定値を算出し、低石炭化度炭の表面破壊強度の推定値を用いて、配合炭中の粘結炭と低石炭化度炭の配合割合で加重平均することにより、コークスの表面破壊強度を推定する方法が開示されている。 Moreover, in patent document 3, when estimating the surface fracture strength of the coke manufactured using the low coal degree coal which does not have expansibility as a part of blended coal, it measures with the temperature increase rate of 3 degree-C / min or more. Using the value of the expansion specific volume of the low-carbonized coal, the inert factor related to the surface fracture strength of caking coal was calculated, and using this, the estimated value of the surface fracture strength of caking coal was calculated, A method for estimating the surface fracture strength of coke is disclosed by performing weighted averaging on the blending ratio of caking coal and low-coalized coal in blended coal using the estimated value of the surface fracture strength of coal.
特許文献２に開示の方法は、コークスの表面破壊強度の推定において有効な技術である。しかし、ＪＩＳ ８８０１に規定されているジラトメータにより測定される全膨張率が０％である粘結性を僅かしか有さない非微粘結炭（以下、「劣質炭」という）を配合した配合炭において、膨張比容積と装入嵩密度の積から求められた空隙充填度を用いて、コークスの表面破壊強度を推定したところ、十分な正確性で推定できないことがあった。 The method disclosed in Patent Document 2 is an effective technique in estimating the surface fracture strength of coke. However, blended coal blended with non-slightly caking coal (hereinafter referred to as “poor coal”) having only a caking property with a total expansion rate of 0% measured by a dilatometer specified in JIS 8801. However, when the surface fracture strength of coke was estimated using the degree of void filling obtained from the product of the expansion specific volume and the charged bulk density, it could not be estimated with sufficient accuracy.
特許文献３に開示の手法は、ＪＩＳ ８８０１に規定されているジラトメータにより測定される全膨張率が０％である低石炭化度炭、所謂劣質炭を配合炭の一部に用いる際のコークス表面破壊強度推定において有効な手法であるが、劣質炭の配合率が多い場合や３℃／分以上の昇温速度で測定した膨張比容積が著しく低い銘柄を用いた場合などは、十分な正確性で推定できないことがあった。 The method disclosed in Patent Document 3 is a coke surface when using low-carbonized coal with a total expansion rate of 0% measured by a dilatometer specified in JIS 8801, so-called inferior coal, as a part of blended coal. This is an effective method for estimating fracture strength, but it is sufficiently accurate when there is a large proportion of inferior coal, or when a brand with a remarkably low expansion specific volume measured at a heating rate of 3 ° C / min or higher is used. There was a case that could not be estimated.
本発明は、このような実情に鑑み、劣質炭を多く配合した配合炭や、膨張比容積が著しく低い劣質炭を配合した配合炭を用いて製造するコークスであっても、その表面破壊強度を正確に推定する方法を提供することを課題とする。 In view of such a situation, the present invention has the surface fracture strength even in the case of coke produced using blended coal containing a large amount of inferior coal or blended coal containing inferior coal having a remarkably low expansion specific volume. It is an object of the present invention to provide a method for accurately estimating.
本発明者らは、上記課題を解決する手段について鋭意検討した。劣質炭は、全膨張率が０％であるため、膨張性では劣質炭同士を区別することができない。そこで、３℃／分よりも高い昇温速度で劣質炭の膨張比容積（以下、「高速昇温膨張比容積」という）を測定して、劣質炭同士を区別した。 The present inventors diligently studied a means for solving the above problems. Inferior charcoal has an overall expansion rate of 0%, and therefore, inferior coal cannot be distinguished from each other in terms of expansibility. Therefore, the expansion specific volume of the inferior coal (hereinafter referred to as “high-speed temperature increase expansion specific volume”) was measured at a temperature rising rate higher than 3 ° C./min to distinguish the inferior coals.
そして、非微粘結炭と劣質炭とを配合した劣質な石炭中の劣質炭の配合率及び劣質炭の高速昇温膨張比容積に対する、表面破壊強度の実測値と推定値との誤差について調査したところ、高速昇温膨張比容積が低いほど、また劣質炭の配合率が高いほど、誤差が大きくなることを知見し、その誤差を解消する手段についてさらに検討した。 And, survey the error between the measured value and the estimated value of the surface fracture strength with respect to the mixing ratio of the inferior coal in the inferior coal blended with the non-slightly caking coal and the inferior coal, and the high temperature heating expansion specific volume of the inferior coal As a result, it was found that the error increases as the high-temperature heating expansion specific volume is lower and the blending ratio of inferior coal is higher, and a means for eliminating the error was further studied.
そこで、高速昇温膨張比容積が後述の閾値（Ｔ）よりも大きい石炭を用いた場合は、予め、劣質炭の高速昇温膨張比容積及び劣質な石炭中の劣質炭の配合率を強度発現阻害要因とする劣質炭に関する粒子間接着影響（補正値）の関係を求めておき、用いる劣質炭の高速昇温膨張比容積及び劣質な石炭中の劣質炭の配合率と、該関係から補正値を求め、劣質な石炭に基づく表面破壊強度の推定値から該補正値を減じたところ、コークスの表面破壊強度を正確に推定できることを見出した。 Therefore, when using a coal whose high-temperature temperature rise and expansion specific volume is larger than the threshold value (T) described later, the high-speed temperature rise and expansion specific volume of the poor quality coal and the blending ratio of the poor quality coal in the poor quality are expressed in advance. The relationship between the interparticle adhesion effect (correction value) on the poor coal as an inhibiting factor is determined, and the high-temperature heating expansion specific volume of the poor coal used, the blending ratio of the poor coal in the poor coal, and the correction value based on the relationship. When the correction value was subtracted from the estimated value of surface fracture strength based on inferior coal, it was found that the surface fracture strength of coke can be accurately estimated.
また、高速昇温膨張比容積が閾値（Ｔ）以下の低い石炭を用いた場合は、上記の補正値でも誤差が生じることが判明した。このため、前記の閾値（Ｔ）よりも低い石炭を用いた場合は、劣質炭の粘結力指数（ＣＩ）及び劣質な石炭中の劣質炭の配合率を強度発現阻害要因とする劣質炭に関する粒子間接着影響（補正値）の関係を求めておき、用いる劣質炭の粘結力指数（ＣＩ）及び劣質な石炭中の劣質炭の配合率と、該関係から補正値を求め、劣質な石炭に基づく表面破壊強度の推定値から該補正値を減じたところ、コークスの表面破壊強度を正確に推定できることを見出した。 Further, it was found that even when the above-described correction value is used, an error occurs when coal having a low high-speed temperature expansion / expansion specific volume of a threshold value (T) or less is used. For this reason, when coal lower than the said threshold value (T) is used, it is related with the poor quality coal which uses the caking power index (CI) of poor quality coal, and the compounding rate of the poor quality coal in poor quality coal as a strength expression inhibition factor. The relationship between the adhesion effect between particles (correction value) is obtained, the caking force index (CI) of the poor quality coal used, the blending ratio of the poor quality coal in the poor quality coal, and the correction value is obtained from the relationship, and the poor quality coal is obtained. When the correction value was subtracted from the estimated value of the surface fracture strength based on the above, it was found that the surface fracture strength of coke can be accurately estimated.
このような検討を通してなされた本発明の要旨は、以下の通りである。
［１］ 劣質炭を配合した配合炭を用いて製造するコークスの表面破壊強度の推定方法において、
前記配合炭は、ビトリニット平均反射率Ｒｏが０.８％以上、ＪＩＳ Ｍ ８８０１で規定される方法によって測定される全膨張率が０％超の粘結炭、及び、劣質な石炭として、ビトリニット平均反射率Ｒｏが０.８％未満で当該全膨張率が０％超の非微粘結炭と当該全膨張率が０％の劣質炭からなり、
（ａ）予め、複数の粘結炭の膨張比容積と装入嵩密度との積から求められる空隙充填度と、得られるコークスの表面破壊強度との関係を求め、
（ｂ）予め、複数の非微粘結炭と劣質炭とを配合した劣質な石炭の膨張比容積と装入嵩密度との積から求められる空隙充填度と、得られるコークスの表面破壊強度との関係を求め、
（ｃ）予め、劣質炭の強度発現阻害要因と粒子間接着影響の補正値との関係を以下のようにして求め、
（c1）劣質炭を３℃／分よりも高い所定の昇温速度で昇温したときの膨張比容積を高速昇温膨張比容積ＳV’として測定し、
（c2）測定した劣質炭の膨張比容積ＳV’が閾値Ｔよりも大きい場合、予め、当該膨張比容積ＳV’と劣質な石炭中の当該劣質炭の配合率とを強度発現阻害要因とし、その要因に基づく劣質炭に関する粒子間接着影響を表す補正値１との関係を求め、
（c3）測定した劣質炭の膨張比容積ＳV’が前記閾値Ｔ以下の場合、さらに当該劣質炭の粘結力指数ＣＩを測定し、予め、測定した粘結力指数ＣＩと劣質な石炭中の当該劣質炭の配合率とを強度発現阻害要因とし、その要因に基づく劣質炭に関する粒子間接着影響を補正値２との関係を求め、
コークスの表面破壊強度の推定にあたり、
（ｄ）用いる配合炭中の粘結炭の空隙充填度を同様に求め、前記（ａ）の関係から当該粘結炭に基づく表面破壊強度の推定値を求め、
（ｅ）用いる配合炭中の劣質な石炭の空隙充填度を同様に求め、前記（ｂ）の関係から当該劣質な石炭に基づく表面破壊強度の推定値を求め、
（ｆ）用いる配合炭中の劣質炭の膨張比容積ＳV’を求め、前記閾値Ｔとの関係に応じて、以下のようにして補正値を求め、
（f1）用いる配合炭中の劣質炭の膨張比容積ＳV’が前記閾値Ｔよりも大きい場合は、当該膨張比容積ＳV’と劣質な石炭中の当該劣質炭の配合率を求め、前記（c2）の関係から補正値１を求め、
（f2）用いる配合炭中の劣質炭の膨張比容積ＳV’が前記閾値Ｔ以下の場合は、当該膨張比容積ＳV’と劣質な石炭中の当該劣質炭の配合率を求め、前記（c3）の関係から補正値２を求め、
（ｇ）前記（ｅ）で求めた劣質な石炭に基づく表面破壊強度の推定値から、劣質炭の膨張比容積ＳV’に応じて、前記（f1）または（f2）で求めた補正値１または補正値２を減じて劣質な石炭に基づく表面破壊強度の補正推定値を求め、
（ｈ）前記（ｄ）で求めた粘結炭に基づく表面破壊強度の推定値と、前記（ｇ）で求めた劣質な石炭に基づく表面破壊強度の補正推定値とを、用いる配合炭中の粘結炭と劣質な石炭の配合率で加重平均する
ことを特徴とするコークス表面破壊強度の推定方法。
The gist of the present invention made through such examination is as follows.
[1] In the method for estimating the surface fracture strength of coke produced using blended coal blended with inferior coal,
The blended coal is a caking coal having a vitrinite average reflectance Ro of 0.8% or more and a total expansion coefficient of more than 0% measured by a method defined in JIS M 8801. A non-slightly caking coal having a reflectance Ro of less than 0.8% and a total expansion rate of more than 0% and an inferior coal having a total expansion rate of 0%,
(A) In advance, obtain the relationship between the degree of void filling obtained from the product of the expansion specific volume and charging bulk density of a plurality of caking coal, and the surface fracture strength of the resulting coke,
(B) The degree of void filling obtained from the product of the expansion specific volume and the charge bulk density of inferior coal previously blended with a plurality of non-slightly caking coal and inferior coal, and the surface fracture strength of the resulting coke. Seeking a relationship
(C) In advance, the relationship between the factor for inhibiting the strength expression of the inferior coal and the correction value for the interparticle adhesion effect is determined as follows,
(C1) The expansion specific volume when the inferior coal is heated at a predetermined temperature increase rate higher than 3 ° C./min is measured as a high-speed temperature increase expansion specific volume SV ′.
(C2) When the measured expansion specific volume SV ′ of the inferior coal is larger than the threshold value T, the expansion specific volume SV ′ and the blending ratio of the inferior coal in the inferior coal are set as strength development inhibiting factors in advance. Find the relationship with the correction value 1 representing the interparticle adhesion effect on the poor coal based on the factors,
(C3) When the measured expansion specific volume SV ′ of the inferior coal is equal to or less than the threshold T, the caking strength index CI of the inferior coal is further measured, and the caking strength index CI measured in advance and the inferior coal Using the blending ratio of the inferior charcoal as a factor that inhibits strength expression, and determining the relationship between the interparticle adhesion effect on the inferior charcoal based on that factor and the correction value 2,
In estimating the surface fracture strength of coke,
(D) Finding the degree of void filling of caking coal in the blended coal to be used in the same manner, obtaining an estimated value of surface fracture strength based on the caking coal from the relationship of (a),
(E) The void filling degree of the poor quality coal in the blended coal to be used is similarly determined, and the estimated value of the surface fracture strength based on the poor quality coal is obtained from the relationship (b),
(F) Obtain the expansion specific volume SV ′ of the inferior coal in the blended coal to be used, and obtain the correction value as follows according to the relationship with the threshold value T,
(F1) When the expansion specific volume SV ′ of the inferior coal in the blended coal to be used is larger than the threshold value T, the ratio of the expansion specific volume SV ′ and the inferior coal in the inferior coal is obtained, and (c2 ) To obtain a correction value of 1
(F2) When the expansion specific volume SV ′ of the inferior coal in the blended coal to be used is equal to or less than the threshold value T, the expansion specific volume SV ′ and the blending ratio of the inferior coal in the inferior coal are obtained, and (c3) The correction value 2 is obtained from the relationship of
(G) From the estimated value of the surface fracture strength based on the inferior coal obtained in (e), the correction value 1 obtained in (f1) or (f2) or according to the expansion specific volume SV ′ of the inferior coal Subtract correction value 2 to obtain a corrected estimate of surface fracture strength based on inferior coal,
(H) In the blended coal using the estimated value of the surface fracture strength based on the caking coal obtained in (d) and the corrected estimated value of the surface fracture strength based on the inferior coal obtained in (g). A method for estimating coke surface fracture strength, characterized by weighted averaging with a blending ratio of caking coal and inferior coal.
［２］前記の３℃／分よりも高い所定の昇温速度が１２℃／分であり、その場合の高速昇温膨張比容積ＳＶ’の閾値Ｔが１．２０であることを特徴とする上記［１］に記載のコークス表面破壊強度の推定方法。 [2] The predetermined temperature increase rate higher than the above 3 ° C./min is 12 ° C./min, and the threshold T of the high temperature temperature increase / expansion specific volume SV ′ in this case is 1.20. The method for estimating the coke surface fracture strength according to the above [1].
本発明によれば、劣質炭に関する粒子間接着影響を補正値として、劣質な石炭に基づく表面破壊強度の推定値から減じるので、劣質炭を配合した配合炭を用いて製造するコークスの表面破壊強度を正確に推定することができる。 According to the present invention, the effect of interparticle adhesion on inferior coal is used as a correction value, and is subtracted from the estimated value of surface fracture strength based on inferior coal, so the surface fracture strength of coke produced using a blended coal blended with inferior coal. Can be estimated accurately.
本発明のコークスの表面破壊強度の推定方法（以下、「本発明の推定法」という）は、粘結炭、非微粘結炭、及び、劣質炭とからなる配合炭を用いて製造するコークスの表面破壊強度の推定方法であり、
（i）粘結炭に基づく表面破壊強度の推定値を求め、
（ii）非微粘結炭と劣質炭とを配合した劣質な石炭に基づく表面破壊強度の推定値を求め、
（iii）劣質炭の高速昇温膨張比容積（ＳV’）が閾値（Ｔ）よりも大きい場合、劣質炭の高速昇温膨張比容積及び劣質な石炭中の配合率を求め、高速昇温膨張比容積及び劣質な石炭中の配合率を強度発現阻害要因とする劣質炭に関する粒子間接着影響の関係から補正値１を求め、
劣質炭の高速昇温膨張比容積（ＳV’）が閾値（Ｔ）以下の場合、劣質炭の粘結力指数（ＣＩ）及び劣質な石炭中の配合率を求め、劣質炭の粘結力指数（ＣＩ）及び劣質な石炭中の配合率を強度発現阻害要因とする劣質炭に関する粒子間接着影響の関係から補正値２を求め、
（iv）劣質な石炭に基づく表面破壊強度の推定値から補正値を減じて補正推定値を求め、
（v）粘結炭に基づく表面破壊強度の推定値と劣質な石炭に基づく表面破壊強度の補正推定値とを、粘結炭と劣質な石炭の配合率で加重平均する
ものである。
The method for estimating the surface fracture strength of coke according to the present invention (hereinafter referred to as “estimation method of the present invention”) is a coke produced using a blended coal comprising caking coal, non-slightly caking coal, and inferior coal. Is a method of estimating the surface fracture strength of
(I) Obtain an estimate of surface fracture strength based on caking coal,
(Ii) Obtain an estimated value of surface fracture strength based on poor quality coal containing non-slightly caking coal and poor quality coal,
(Iii) When the high-temperature temperature-expanding specific volume (SV ′) of the inferior coal is larger than the threshold (T), the high-temperature temperature-expanding specific volume of the inferior coal and the blending ratio in the inferior coal are obtained, The correction value 1 is obtained from the relationship between the interparticle adhesion effect on the inferior coal with the specific volume and the blending ratio in the inferior coal as the strength expression inhibiting factor,
When the high temperature heating expansion specific volume (SV ') of the inferior coal is less than the threshold (T), the caking strength index (CI) of the inferior coal and the blending ratio in the inferior coal are obtained, and the caking strength index of the inferior coal. (CI) and the correction value 2 is obtained from the relationship between the interparticle adhesion effects on the inferior coal having the compounding ratio in the inferior coal as the strength expression inhibiting factor,
(Iv) subtracting the correction value from the estimated value of surface fracture strength based on inferior coal to obtain a correction estimation value;
(V) A weighted average of the estimated value of the surface fracture strength based on caking coal and the corrected estimated value of the surface fracture strength based on inferior coal at the blending ratio of caking coal and inferior coal.
以下、本発明の推定法に至った検討の経緯について説明するとともに、本発明の推定法について説明する。
従来、表面破壊強度は、粘結炭と非微粘結炭のそれぞれについて、膨張比容積と装入嵩密度の積から求められた空隙充填度を用いて、それぞれに基づく表面破壊強度を推定し、粘結炭と非微粘結炭の配合率で加重平均することにより、推定されていた。石炭軟化時の膨張比容積ＳＶは、ＪＩＳ Ｍ８８０１の膨張性試験に用いるジラトメータ装置を用いた試験（昇温速度３℃／分）により、以下の（１）式で算出される。
Hereinafter, the background of the study that led to the estimation method of the present invention will be described, and the estimation method of the present invention will be described.
Conventionally, the surface fracture strength is estimated based on each of the caking coal and the non-slightly caking coal using the degree of void filling obtained from the product of the expansion specific volume and the charged bulk density. It was estimated by weighted averaging with the blending ratio of caking coal and non-caking caking coal. The expansion specific volume SV at the time of coal softening is calculated by the following equation (1) by a test using a dilatometer device used in the expansibility test of JIS M8801 (temperature increase rate 3 ° C./min).
膨張比容積ＳＶ［ｃｍ3／ｇ］＝最大膨張時の石炭体積［ｃｍ3］／石炭装入量［ｇ］
・・・（１）
Expansion specific volume SV [cm 3 / g] = Coal volume at maximum expansion [cm 3 ] / Coal charge [g]
... (1)
また、石炭軟化時の空隙充填度は、（１）式により求めた膨張比容積ＳＶと装入嵩密度ＢＤを用い、以下の（２）式から算出することができる。 Moreover, the void filling degree at the time of coal softening can be calculated from the following equation (2) using the expansion specific volume SV and the charging bulk density BD obtained by the equation (1).
空隙充填度［−］＝膨張比容積ＳＶ［ｃｍ3／ｇ］×装入嵩密度ＢＤ［ｇ／ｃｍ3］
・・・（２）
Void filling degree [−] = expansion specific volume SV [cm 3 / g] × charged bulk density BD [g / cm 3 ]
... (2)
しかしながら、全膨張率が０％の劣質炭を配合した配合炭に対して、粘結炭と非微粘結炭（劣質炭を含む）のそれぞれに基づく表面破壊強度を推定し、粘結炭と非微粘結炭の配合率で加重平均することによりコークスの表面破壊強度を推定したところ、正確に推定できないことがあった。 However, for coal blended with inferior coal with a total expansion rate of 0%, surface fracture strength based on caking coal and non-minor caking coal (including inferior coal) is estimated, and caking coal When the surface fracture strength of coke was estimated by weighted averaging with the blending ratio of non-slightly caking coal, it could not be estimated accurately.
これは、全膨張率が０％の同じ劣質炭の括りの中でも、実際には僅かな粘結性の違いが存在し、接着不良の度合いが異なるためと考えた。すなわち、劣質炭の性状により、同一の配合率でも強度低下への影響が異なると考えた。 This was thought to be due to the fact that there was actually a slight difference in caking property among the same poor coals with a total expansion rate of 0%, and the degree of adhesion failure was different. That is, it was considered that the influence on strength reduction was different even at the same blending ratio depending on the properties of the inferior quality coal.
そこで、３℃／分よりも高い昇温速度で劣質炭の高速昇温膨張比容積を求め、劣質炭同士を区別し、劣質炭間の性状の違いによる強度低下への影響について次のような試験を行った。 Therefore, the high temperature heating expansion specific volume of the inferior coal is obtained at a temperature rising rate higher than 3 ° C./min, the inferior coals are distinguished from each other, and the influence on the strength reduction due to the difference in properties between the inferior coals is as follows. A test was conducted.
まず、非微粘結炭及び４種の劣質炭を準備した。非微粘結炭のビトリニット平均反射率Ｒｏは０.７％である。表１に、非微粘結炭及び劣質炭の揮発分量ＶＭ、全膨張率ＴＤ、及び、高速昇温膨張比容積（ＳV’）を示す。
以下、揮発分ＶＭは、ＪＩＳ Ｍ８８１２で規定される方法、全膨張率ＴＤは、ＪＩＳ Ｍ ８８０１で規定される方法により測定したものを示す。高速昇温膨張比容積の測定法については、以下に簡潔に説明する。
First, non-slightly caking coal and four types of inferior coal were prepared. The vitrinite average reflectance Ro of non-slightly caking coal is 0.7%. Table 1 shows the volatile matter amount VM, the total expansion rate TD, and the high-temperature temperature-expanding specific volume (SV ′) of non-slightly caking coal and inferior coal.
Hereinafter, the volatile matter VM is measured by a method defined by JIS M8812, and the total expansion coefficient TD is measured by a method defined by JIS M8801. The method for measuring the fast temperature increase / expansion specific volume will be briefly described below.
高速昇温膨張比容積（ＳV’）は、ＪＩＳ Ｍ８８０１で規定される膨張性試験方法に用いる細管に、劣質炭を粒度１ｍｍ篩下１００％及び嵩密度０．８５ｇ／ｃｍ3で充填し、少なくとも４００℃に達した時点から５００℃に達するまでの平均昇温速度が３℃／分よりも高い昇温速度（ここでは、１２℃／ｍｉｎ）になるように昇温させ、その際のピストンの変位量を測定し、この変位量から膨張率を求め、この膨張率から求めた。 The high-temperature heating expansion specific volume (SV ′) is obtained by filling a thin tube used in the expansibility test method defined in JIS M8801 with inferior coal at a particle size of 1 mm under 100% sieve and a bulk density of 0.85 g / cm 3. The temperature is raised so that the average rate of temperature rise from the point of reaching 400 ° C. to the point of reaching 500 ° C. is higher than 3 ° C./min (here, 12 ° C./min). The amount of displacement was measured, the expansion rate was determined from the amount of displacement, and the rate of expansion was determined.
表２に示す配合率及び装入嵩密度の条件において、石炭約５０ｋｇを有効寸法Ｗ２４０ｍｍ×Ｌ５４０ｍｍ×Ｈ５００ｍｍのＳＵＳ製乾留容器に充填し、石炭中部の昇温パターンが実コークス炉のそれとほぼ対応するよう、初期炉温８２０℃−最終炉温１０４０℃で昇温し１８時間乾留を行った。乾留後のコークスは窒素冷却後、表面破壊強度（ＤＩ150 6）を測定した。 Under the conditions of the blending ratio and charging bulk density shown in Table 2, about 50 kg of coal is filled into a SUS dry distillation vessel having an effective dimension of W240 mm × L540 mm × H500 mm, and the temperature rising pattern in the middle of the coal almost corresponds to that of the actual coke oven. Thus, the temperature was raised from an initial furnace temperature of 820 ° C. to a final furnace temperature of 1040 ° C., and dry distillation was performed for 18 hours. The coke after dry distillation was cooled with nitrogen, and the surface fracture strength (DI 150 6 ) was measured.
図１に、非微粘結炭単味及び非微粘結炭と劣質炭からなる劣質な石炭の空隙充填度（ＳＶ×ＢＤ）に対する、表面破壊強度（ＤＩ150 6）の関係を示す。なお、膨張比容積ＳＶ［ｃｍ3／ｇ］は、通常測定時の昇温速度である３℃／分で昇温することにより測定したものである。 FIG. 1 shows the relationship of the surface fracture strength (DI 150 6 ) to the degree of void filling (SV × BD) of non-slightly caking coal and poor quality coal consisting of non-slightly caking coal and inferior coal. In addition, expansion specific volume SV [cm < 3 > / g] is measured by heating up at 3 degree-C / min which is the temperature increase rate at the time of a normal measurement.
図１に点線で示す関係線は、別途に複数の非微粘結炭を用いて求められた、空隙充填度（ＳＶ×ＢＤ）と表面壊強度（ＤＩ150 6）との関係であり、空隙充填度（ＳＶ×ＢＤ）の低下に伴って、表面破壊強度（ＤＩ150 6）は低下する。一方、劣質炭は、膨張性を有さないため、膨張性を有する非微粘結炭に配合すると、膨張比容積ＳＶは低下する。 The relationship line indicated by a dotted line in FIG. 1 is a relationship between the degree of void filling (SV × BD) and the surface fracture strength (DI 150 6 ) separately obtained using a plurality of non-micro-coking coals. As the filling degree (SV × BD) decreases, the surface breaking strength (DI 150 6 ) decreases. On the other hand, since inferior coal does not have expansibility, if it mix | blends with the non-slightly caking coal which has expansibility, expansion specific volume SV will fall.
図１において、銘柄Ｂ３の劣質炭を配合した場合に、１５質量％、３０質量％と配合するに従い、つまり、空隙充填度（ＳＶ×ＢＤ）が低下するに従い、関係線から乖離する現象が確認された。また、銘柄Ｂ４の劣質炭を配合した場合は、１５質量％、３０質量％と配合するに従い、関係線から乖離する現象が確認された。すなわち、銘柄Ｂ３およびＢ４の劣質炭において、膨張性以外の強度影響因子が顕在化することを知見した。 In Fig. 1, when blended with grade B3 inferior charcoal, a phenomenon that deviates from the relational line as 15% by mass or 30% by mass, that is, as the degree of void filling (SV × BD) decreases is confirmed. It was done. In addition, when blended with grade B4 inferior charcoal, a phenomenon deviating from the relationship line was confirmed as blended with 15% by mass and 30% by mass. That is, it was found that strength-influencing factors other than expansibility become apparent in the inferior coals of brands B3 and B4.
図２に、銘柄Ｂ３の劣質炭を配合して得られたコークスのＳＥＭ写真の撮像を示す。図２（ａ）は、粒子間の状態を示す撮像であり、図２（ｂ）は、粒子表面の撮像である。図２（ａ）に示すように、劣質炭粒子を配合して得られたコークスの粒子同士は、接触しているが融着していない部分があり、図２（ｂ）に示すように、コークスの表面から剥がれ落ちた形跡がみられ、劣質炭粒子間の接着不良が示唆される。 In FIG. 2, the imaging of the SEM photograph of the coke obtained by mix | blending the poor quality coal of brand B3 is shown. FIG. 2A is an image showing a state between particles, and FIG. 2B is an image of the particle surface. As shown in FIG. 2 (a), coke particles obtained by blending inferior coal particles are in contact with each other but are not fused, and as shown in FIG. 2 (b), There is evidence of peeling off from the surface of the coke, suggesting poor adhesion between the inferior carbon particles.
そこで、本発明者らは、非微粘結炭単味および劣質炭からなる配合炭中の、劣質炭配合率及び劣質炭の性状（昇温速度１２℃／分での高速昇温膨張比容積）に対する、表面破壊強度（ＤＩ150 6）の実測値と推定値（図１の関係線）との誤差（ＤＩ150 6実計差）について調査した。図３に、劣質炭の配合率Ｘに対するＤＩ150 6実計差の関係を示す。図４に、劣質炭の高速昇温膨張比容積ＳＶ’に対するＤＩ150 6実計差の関係を示す。 Therefore, the present inventors have determined that the blend ratio of the inferior coal and the properties of the inferior coal in the blended coal consisting of the non-slightly caking coal simple and the inferior coal (the fast temperature rising expansion specific volume at a heating rate of 12 ° C./min). ), The error (DI 150 6 actual difference) between the measured value and the estimated value (relation line in FIG. 1) of the surface fracture strength (DI 150 6 ) was investigated. FIG. 3 shows the relationship of the actual difference of DI 150 6 to the blending ratio X of inferior coal. FIG. 4 shows the relationship of the actual difference of DI 150 6 with respect to the high-speed temperature expansion and expansion specific volume SV ′ of inferior coal.
図３及び図４に示すように、配合率Ｘが高いほど、高速昇温膨張比容積ＳＶ’が低いほど、ＤＩ150 6実計差が大きくなった。そこで、本発明者らは、この知見に基づき、劣質炭の配合率Ｘと高速昇温膨張比容積ＳＶ’とを強度発現阻害要因とし、その要因と劣質炭の粒子間接着影響の相互の関係を求め、この関係を用いて劣質な石炭に基づく表面破壊強度の推定値を補正することに着想した。そして、それを実現するために劣質炭の粒子間接着影響（補正値）を以下のように式化した。 As shown in FIGS. 3 and 4, the higher the blending ratio X and the lower the fast temperature rising expansion specific volume SV ′, the greater the actual difference in DI 150 6 . Therefore, based on this finding, the present inventors made the blending ratio X of the poor quality coal and the fast temperature rising expansion specific volume SV ′ as factors that inhibit the strength expression, and the relationship between the factors and the interparticle adhesion effect of the poor quality coal. The idea was to use this relationship to correct estimates of surface fracture strength based on poor quality coal. And in order to implement | achieve it, the adhesion effect (correction value) between the particles of inferior quality charcoal was formulated as follows.
粒子間接着影響＝ａ×（Ｘ／ｂ）ｃ×（ｄ／ＳＶ’）ｅ ・・・（３）
Ｘ：劣質炭の配合率［質量％］
ＳＶ’：劣質炭の高速昇温膨張比容積ＳＶ’［ｇ／ｃｍ3］
Interparticle adhesion effect = a × (X / b) c × (d / SV ′) e (3)
X: Mixing ratio of inferior coal [mass%]
SV ′: High-temperature expansion specific volume SV ′ [g / cm 3 ] of inferior coal
この（３）式において定数ａ、ｂ、ｃ、ｄ及びｅは、試行錯誤的に決定することができ、劣質な石炭の膨張比容積ＳＶの測定時の昇温速度が１２℃／分の条件において、ａ＝０．４、ｂ＝１５、ｃ＝３、ｄ＝１．２４、ｅ＝２０であった。 In this equation (3), the constants a, b, c, d and e can be determined by trial and error, and the rate of temperature rise when measuring the expansion specific volume SV of inferior coal is 12 ° C./min. In this case, a = 0.4, b = 15, c = 3, d = 1.24, and e = 20.
図４中の点線は、（３）式における計算値（上側の点線：Ｘが１５質量％、下側の点線：Ｘが３０質量％）であり、劣質炭Ｂ３（ＳＶ’＝１．２４）は、配合率１５％、３０％ともＤＩ150 6実計差をよく推定できているが、劣質炭Ｂ４（ＳＶ’＝１．１８）については、いずれの配合率とも推定できないことが確認された。 The dotted line in FIG. 4 is the calculated value in the formula (3) (upper dotted line: X is 15% by mass, lower dotted line: X is 30% by mass), and inferior coal B3 (SV ′ = 1.24). Has been able to estimate the actual difference of DI 150 6 for both 15% and 30%, but it was confirmed that neither of the blending ratios could be estimated for inferior coal B4 (SV ′ = 1.18). .
そこで、発明者らは劣質炭Ｂ４に関しては、強度発現阻害要因を劣質炭の粘結力指数(ＣＩ)と配合率として粒子間接着影響を（４）式のように式化した。
なお、粘結力指数ＣＩとは、石炭１ｇ（粒度０．２５mm以下）に粉コークス９ｇ（粒度０．２５〜０．３mm）を配合したものを磁性るつぼ内に入れ９００℃で７分間乾留して得られたコークスを０．４２mmの篩にかけて、その篩上に溜まった質量を百分率で表した値である。
Therefore, the inventors formulated the effect of intergranular adhesion as shown in the equation (4) with respect to the inferior coal B4, using the causticity index (CI) of the inferior coal and the blending ratio as factors for inhibiting the strength expression.
The cohesive strength index CI is a mixture of 1 g of coal (particle size 0.25 mm or less) and 9 g of powdered coke (particle size 0.25 to 0.3 mm) placed in a magnetic crucible and carbonized at 900 ° C. for 7 minutes. The coke obtained above was passed through a 0.42 mm sieve, and the mass accumulated on the sieve was expressed as a percentage.
粒子間接着影響＝ｆ＋ｇ×ＣＩ＋ｈ×Ｘ ・・・（４）
X：劣質炭の配合率［質量％］
ＣＩ：劣質炭の粘結力指数［−］
この（４）式において、定数ｆ、ｇ、ｈは試行錯誤的に求めることができ、本実験結果からは、ｆ＝−１３．９７、ｇ＝０．３５、ｈ＝−０．３９であった。
Interparticle adhesion effect = f + g × CI + h × X (4)
X: Mixing ratio of inferior coal [mass%]
CI: Bonding index of inferior coal [-]
In this equation (4), the constants f, g, and h can be obtained by trial and error. From the results of this experiment, f = −13.97, g = 0.35, and h = −0.39. It was.
次に、この粒子間接着影響を加味したコークスの表面破壊強度の推定値と、コークスの表面破壊強度の実測値との関係を調査した。
まず、粘結炭Ｘと、表１に示す非微粘結炭及び劣質炭を準備した。粘結炭のビトリニット平均反射率Ｒｏは１．２４％で、全膨張率は１０１％である。表３に示す配合率の配合炭とした。そして、配合炭を前述と同様の条件により乾留容器で乾留し、表面破壊強度（ＤＩ150 6）を測定した。
Next, the relationship between the estimated value of the surface fracture strength of coke considering the adhesion between particles and the measured value of the surface fracture strength of coke was investigated.
First, caking coal X and non-slightly caking coal and inferior coal shown in Table 1 were prepared. The vitrinite average reflectance Ro of caking coal is 1.24%, and the total expansion coefficient is 101%. The blended charcoal with the blending ratio shown in Table 3 was used. The blended coal was carbonized in a carbonization vessel under the same conditions as described above, and the surface fracture strength (DI 150 6 ) was measured.
また、粘結炭Ｘと、表３に示す配合率で、非微粘結炭Ａと、劣質炭Ｂ１、Ｂ３、Ｂ４のいずれかとが配合された劣質な石炭について、それぞれの膨張比容積と装入嵩密度を求め、それらの積から求められた空隙充填度と、予め求められた空隙充填度と表面破壊強度の関係とから、粘結炭と劣質な石炭それぞれに基づく表面破壊強度の推定値を得た。そして、コークスの表面破壊強度の推定値は、次のようにして求めた。 Further, regarding the caking coal X and the inferior coal in which the non-slightly caking coal A and any of the inferior coals B1, B3, and B4 are blended at the blending ratios shown in Table 3, the respective expansion specific volumes and loadings are set. Estimated surface fracture strength based on caking coal and inferior coal from the filling degree of void density obtained from those products and the relationship between the filling degree of void filling degree and surface fracture strength obtained in advance. Got. And the estimated value of the surface fracture strength of coke was calculated | required as follows.
従来の推定値１として、粘結炭に基づく表面破壊強度の推定値を膨張比容積にイナートファクターを加味して求め、劣質な石炭に基づく表面破壊強度の推定値とを配合炭中の粘結炭と劣質な石炭の配合率で加重平均して求めた。
従来の推定値２として、粘結炭に基づく表面破壊強度の推定において、膨張比容積に加味するイナートファクターを、劣質炭についてはＳＶ’の関数から求め（特許文献３の手法による）、その粘結炭に基づく表面破壊強度の推定と、劣質な石炭に基づく表面破壊強度の推定値とを配合炭中の粘結炭と劣質な石炭の配合率で加重平均して求めた。
As the conventional estimated value 1, the estimated value of the surface fracture strength based on the caking coal is obtained by adding the inert factor to the expansion specific volume, and the estimated value of the surface fracture strength based on the inferior coal is caking in the blended coal. The weighted average was calculated by the blending ratio of charcoal and inferior coal.
As the conventional estimated value 2, in the estimation of the surface fracture strength based on caking coal, the inert factor added to the expansion specific volume is obtained from the SV ′ function for the inferior coal (by the method of Patent Document 3), and its viscosity The estimation of the surface fracture strength based on coal coal and the estimated value of the surface fracture strength based on inferior coal were obtained by weighted averaging with the blending ratio of caking coal and inferior coal in the blended coal.
一方、粒子間接着影響を加味した推定値１として、（３）式を用い、劣質炭の粒子間接着影響（補正値１）を求め、劣質な石炭に基づく表面破壊強度の推定値から補正値１を減じて補正推定値とし、粘結炭に基づく表面破壊強度の推定値と、劣質な石炭に基づく表面破壊強度の補正推定値とを配合炭中の粘結炭と劣質な石炭の配合率で加重平均して求めた。 On the other hand, as the estimated value 1 including the interparticle adhesion effect, the interparticle adhesion effect (correction value 1) of the inferior coal is obtained using the equation (3), and the correction value is obtained from the estimated value of the surface fracture strength based on the inferior coal. 1 is used as the corrected estimated value, and the estimated value of the surface fracture strength based on caking coal and the corrected estimated value of the surface fracture strength based on inferior coal are blended ratios of caking coal and inferior coal in the blended coal. Was obtained by weighted average.
また、粒子間接着影響を加味した推定値２として、劣質炭Ｂ４については（４）式を用い、劣質炭の粒子間接着影響（補正値２）を求め、劣質な石炭に基づく表面破壊強度の推定値から補正値２を減じて補正推定値とし、粘結炭に基づく表面破壊強度の推定値と、劣質な石炭に基づく表面破壊強度の補正推定値とを配合炭中の粘結炭と劣質な石炭の配合率で加重平均して求めた。 In addition, as an estimated value 2 in consideration of the adhesion effect between particles, the equation (4) is used for the inferior coal B4, and the adhesion effect between the particles of the inferior coal (correction value 2) is obtained, and the surface fracture strength based on the inferior coal is calculated. The correction value 2 is subtracted from the estimated value to obtain a corrected estimated value, and the estimated value of surface fracture strength based on caking coal and the corrected estimated value of surface fracture strength based on inferior coal are combined with caking coal and inferior in blended coal. It was obtained by weighted average with the blending ratio of various coals.
図５に、ＤＩ150 6実測値とＤＩ150 6推定値との関係を示す。このように、従来の推定値１、従来の推定値２では、実測値との誤差が大きくなる場合があったが、（３）式により粒子間接着影響を加味した推定値１では、Ｎｏ．１〜５のいずれの配合炭においても実測値とほぼ一致した。また、（４）式により粒子間接着影響を加味した推定値２では、No.６〜７の配合炭においても推定値は実測値とほぼ一致した。 Figure 5 shows the relationship between DI 0.99 6 actual measured value and the DI 0.99 6 estimated value. As described above, in the conventional estimated value 1 and the conventional estimated value 2, there was a case where an error from the actually measured value becomes large. However, in the estimated value 1 in which the influence of adhesion between particles is added according to the equation (3), No. In any of the blended coals 1 to 5, the measured values almost coincided. Moreover, in the estimated value 2 which considered the adhesion effect between particle | grains by (4) Formula, the estimated value also substantially corresponded with the measured value also in the No. 6-7 coal blend.
このように、粒子間接着影響を、劣質な石炭に基づく表面破壊強度の推定値からから減ずることで、コークスの表面破壊強度を正確に推定することができることを見出した。 Thus, it was found that the surface fracture strength of coke can be accurately estimated by subtracting the interparticle adhesion effect from the estimated value of surface fracture strength based on poor quality coal.
本発明は、以上のような検討過程を経て上記（１）に記載の発明に至ったものであり、そのような本発明について、本発明の推定法の流れを説明するとともに、必要な要件や好ましい要件について順次説明する。 The present invention has reached the invention described in the above (1) through the examination process as described above. For such the present invention, the flow of the estimation method of the present invention is explained, and the necessary requirements and Preferred requirements will be described sequentially.
まず、表面破壊強度を推定するコークスを製造する配合炭は、次の石炭とする。
粘結炭：ビトリニット平均反射率Ｒｏが０.８％以上、全膨張率が０％超
非微粘結炭：ビトリニット平均反射率Ｒｏが０.８％未満、全膨張率が０％超
劣質炭：全膨張率が０％
なお、ビトリニット反射率Ｒｏは、ＪＩＳ Ｍ８８１６で規定される方法によって測定されるものである。
First, the coal blend for producing coke for estimating the surface fracture strength is the following coal.
Coking coal: Vitrinite average reflectance Ro is 0.8% or more and total expansion rate is more than 0% Non-slightly caking coal: Vitrinite average reflectance Ro is less than 0.8% and total expansion rate is more than 0% : Total expansion rate is 0%
The vitrinite reflectance Ro is measured by a method defined in JIS M8816.
そして、粘結炭と、非微粘結炭及び劣質炭を配合した劣質な石炭とに分けて、それぞれに関する表面破壊強度を推定する。これは、上記の性状の非微粘結炭及び劣質炭の場合、粘結炭の膨張を阻害するため、膨張比容積の加成性が成立せず、表面破壊強度の推定に影響を与えるためである。また、劣質な石炭を、非微粘結炭と劣質炭とに分けることで、非微粘結炭に基づく表面破壊強度の推定に影響する劣質炭による粒子間接着影響を補正する。 And it divides into caking coal and the inferior coal which mix | blended non-slightly caking coal and inferior coal, and the surface fracture strength about each is estimated. This is because in the case of non-slightly caking coal and inferior coal with the above properties, the caking coal expansion is inhibited, so the additivity of the expansion specific volume is not established, and the estimation of the surface fracture strength is affected. It is. Further, by dividing inferior coal into non-slightly caking coal and inferior coal, the interparticle adhesion effect due to the inferior coal that affects the estimation of surface fracture strength based on non-slightly caking coal is corrected.
＜（ａ）予め求める粘結炭の空隙充填度とコークスの表面破壊強度との関係＞
複数種の粘結炭の膨張比容積を、ＪＩＳ Ｍ８８０１に規定されている測定法により測定し、複数種の粘結炭をコークス炉に装入する時の装入嵩密度を求め、上記（２）式で定義される石炭軟化時の空隙充填度を求めるとともに、乾留して表面破壊強度ＤＩ150 15を測定し、空隙充填度と粘結炭に基づく表面破壊強度との関係を予め求める。なお、粘結炭が複数銘柄の石炭を含む場合には、粘結炭の膨張比容積は、各石炭の膨張比容積を配合比率で加重平均して求めることができる。
<(A) Relationship between void filling degree of caking coal obtained in advance and surface fracture strength of coke>
The expansion specific volume of plural types of caking coal is measured by the measuring method prescribed in JIS M8801, and the charging bulk density when charging plural types of caking coal into a coke oven is obtained, and the above (2 The degree of void filling at the time of coal softening defined by the formula is determined, and the surface fracture strength DI 150 15 is measured by dry distillation, and the relationship between the degree of void filling and the surface fracture strength based on caking coal is obtained in advance. In addition, when caking coal contains several brands of coal, the expansion specific volume of caking coal can be calculated | required by carrying out the weighted average of the expansion specific volume of each coal with a compounding ratio.
＜（ｂ）予め求める劣質な石炭の空隙充填度とコークスの表面破壊強度との関係＞
上述の予め求める粘結炭の空隙充填度とコークスの表面破壊強度との関係の求め方と同様に、複数種の劣質な石炭の膨張比容積を測定し、複数種の劣質な石炭をコークス炉に装入する時の装入嵩密度を求め、空隙充填度を求めるとともに、乾留して表面破壊強度ＤＩ150 15を測定し、空隙充填度と劣質な石炭に基づく表面破壊強度との関係を予め求める。なお、非微粘結炭が複数銘柄の石炭を含む場合には、非微粘結炭の膨張比容積は、各石炭の膨張比容積を配合比率で加重平均して求めることができる。
<(B) Relationship between Pore Filling Degree of Poor Coal and Surface Fracture Strength of Coke>
Similar to the above-described method for determining the relationship between the degree of void filling of caking coal obtained in advance and the surface fracture strength of coke, the expansion specific volume of multiple types of inferior coal is measured, and multiple types of inferior coal are converted into a coke oven. The charge bulk density at the time of charging is obtained, the degree of void filling is obtained, the surface fracture strength DI 150 15 is measured by dry distillation, and the relationship between the degree of void filling and the surface fracture strength based on inferior coal is determined in advance. Ask. In the case where the non-slightly caking coal includes a plurality of brands of coal, the expansion specific volume of the non-slightly caking coal can be obtained by weighted averaging the expansion specific volume of each coal by the blending ratio.
＜（ｃ）予め求める劣質炭の強度発現阻害要因と粒子間接着影響の関係＞
［（ｃ１）劣質炭の高速昇温膨張比容積（ＳV’）の測定］
劣質炭を３℃／分よりも高い所定の昇温速度（ｖ’）で昇温して、その比容積を高速昇温膨張比容積（ＳV’）として測定する。測定した劣質炭の膨張比容積（ＳV’）と閾値（Ｔ）を比較する。
<(C) Relationship between Inhibition Factor of Inferior Charcoal Strength Expression and Interparticle Adhesion Effect Obtained in advance>
[(C1) Measurement of high temperature heating expansion specific volume (SV ') of inferior coal]
The inferior coal is heated at a predetermined temperature increase rate (v ′) higher than 3 ° C./min, and the specific volume is measured as a high-speed temperature increase / expansion specific volume (SV ′). The measured expansion specific volume (SV ') of the poor quality coal is compared with the threshold value (T).
ここで、閾値（Ｔ）は、３℃／分よりも高い所定の昇温温度（例えば１２℃／分）で測定した劣質炭の膨張比容積を用いて、上記（３）式により粒子間接着影響を加味した推定値１が、実測値とほぼ一致する領域と、推定値１と実測値が乖離する領域とを区分する値である。
この閾値（Ｔ）は、全膨張率が０％の複数の劣質炭を対象として、３℃／minよりも高い所定の昇温温度（例えば１２℃／分）で測定した劣質炭の膨張比容積を用いて、前記の推定値１と実測値とを比較することで、求めることができる。
ちなみに、昇温温度が１２℃／分であれば、閾値（Ｔ）は１．２０であることを、本発明者は実験的に確認している。
Here, the threshold value (T) is an interparticle adhesion according to the above equation (3) using the expansion specific volume of inferior coal measured at a predetermined temperature rise temperature (for example, 12 ° C./min) higher than 3 ° C./min. The estimated value 1 that takes into account the influence is a value that divides a region that approximately matches the actual measured value and a region where the estimated value 1 and the actual measured value deviate.
This threshold value (T) is an expansion specific volume of inferior coal measured at a predetermined temperature rise (for example, 12 ° C./min) higher than 3 ° C./min for a plurality of inferior coals having a total expansion rate of 0%. Can be obtained by comparing the estimated value 1 and the actually measured value.
Incidentally, the inventor has experimentally confirmed that the threshold value (T) is 1.20 when the temperature rising temperature is 12 ° C./min.
［（ｃ２）予め求める高速昇温膨張比容積と配合率とを強度発現阻害要因とする粒子間接着影響の関係］
膨張比容積（ＳＶ’）が閾値（T）よりも大きい場合、当該膨張比容積ＳＶ’と劣質な石炭中の劣質炭の配合率Ｘとを強度発現阻害要因とし、その要因と劣質炭に関する粒子間接着影響（補正値）の関係を予め求める。
[(C2) Relationship between Adhesion Effect between Particles Using High-Speed Temperature Expansion Expansion Volume and Blending Rate as Predictors of Strength Development]
When the expansion specific volume (SV ′) is larger than the threshold value (T), the expansion specific volume SV ′ and the compounding ratio X of inferior coal in the inferior coal are used as strength-inhibiting factors, and the factors and particles related to the inferior coal The relationship of the inter-bonding effect (correction value) is obtained in advance.
まず、複数種の劣質炭を用い、図３及び図４に示すような、劣質な石炭中の劣質炭の配合率Ｘ及び膨張比容積ＳＶ’に対する、表面破壊強度（ＤＩ150 6）の実測値と推定値と誤差（ＤＩ150 6実計差）の関係を求める。 First, measured values of surface fracture strength (DI 150 6 ) with respect to blending ratio X and expansion specific volume SV ′ of inferior coal in inferior coal as shown in FIGS. 3 and 4 using plural kinds of inferior coal. And the relationship between the estimated value and the error (DI 150 6 actual difference).
次に、劣質炭の配合率Ｘに対するＤＩ150 6実計差の関係及び劣質炭の膨張比容積ＳＶ’に対するＤＩ150 6実計差の関係において、該関係を表現できる粒子間接着影響（補正値）の式の関数形を決める。関数形は任意であり、上記（３）式の形に限定されるものではない。ここでは、上記（３）式の関数形を選択し、説明する。 Next, the relationship between DI 0.99 6 real meter difference for DI 0.99 6 expansion ratio volume SV relationships and poor quality coal real meter difference 'for blending ratio X of poor quality coal, among the particles can be expressed the relationship adhesion effect (correction value ) To determine the function form. The function form is arbitrary and is not limited to the form of the above formula (3). Here, the function form of the above equation (3) is selected and described.
次に、（３）式において、定数ａ、ｂ、ｃ、ｄ及びｅを求める。
まず、図３及び図４に示すような、関係を求める試験を行った中で、最も高速昇温膨張比容積ＳＶ’の値が小さい銘柄の石炭、図３では、銘柄Ｂ３の石炭（ＳＶ’＝１．２４）について、ａ×（Ｘ／ｂ）ｃの定数を決める。試験条件の中で任意の配合率の数値を定数ｂとすると、Ｘ＝ｂのときのＤＩ150 6実計差が定数ａとなる。次に、他の配合率において、先述のａ及びｂを適用した場合、配合率の影響を説明できる乗数ｃを試行錯誤的に決定する。
Next, constants a, b, c, d, and e are obtained in equation (3).
First, among the tests for obtaining the relationship as shown in FIG. 3 and FIG. 4, the coal of the brand with the smallest value of the high-speed heating expansion specific volume SV ′, in FIG. 3, the coal of the brand B3 (SV ′ = 1.24), a constant of a × (X / b) c is determined. If the numerical value of an arbitrary blending rate in the test conditions is a constant b, the DI 150 6 actual difference when X = b is the constant a. Next, when the above-described a and b are applied at other mixing ratios, a multiplier c that can explain the influence of the mixing ratio is determined by trial and error.
次に、劣質炭の配合率Ｘを固定した場合に、図４の変化を説明できるｄ及びｅを試行錯誤的に決定する。これらは、劣質炭の配合率Ｘと高速昇温膨張比容積ＳＶ’のＤＩ150 6実計差に及ぼす影響感度がひとつの乗数で説明できないために行うのであり、式中の定数ａ、ｂ、ｃ、ｄ、及びｅは、図３及び図４に示す関係を求める試験の条件により異なる。 Next, when the blending ratio X of inferior coal is fixed, d and e that can explain the change in FIG. 4 are determined by trial and error. These are performed because the influence sensitivity on the DI 150 6 actual difference of the blend ratio X of the inferior coal and the high-speed heating expansion specific volume SV ′ cannot be explained by one multiplier, and constants a, b, c, d, and e differ depending on the test conditions for obtaining the relationship shown in FIGS.
図３の例では、劣質な石炭の膨張比容積ＳＶの測定時の昇温速度は１２℃／ｍｉｎとし、その条件においては、ａ＝０．４、ｂ＝１５、ｃ＝３、ｄ＝１．２４、ｅ＝２０となった。 In the example of FIG. 3, the rate of temperature rise when measuring the expansion specific volume SV of inferior coal is 12 ° C./min. Under these conditions, a = 0.4, b = 15, c = 3, d = 1 .24, e = 20.
［（ｃ３）予め求める石炭粘結力指数と配合率とを強度発現阻害要因とする粒子間接着影響の関係］
膨張比容積(ＳＶ’)が閾値（Ｔ）以下の場合、さらに劣質炭の粘結力指数ＣＩを測定しておき、該粘結力指数ＣＩと劣質な石炭中の劣質炭の配合率Ｘとを強度発現阻害要因とし、その要因と劣質炭に関する粒子間接着影響（補正値）の関係を予め求める。
[(C3) Relationship between the adhesion effects between particles using the coal cohesive strength index and the blending ratio determined in advance as factors that inhibit strength expression]
When the expansion specific volume (SV ′) is equal to or less than the threshold (T), the caking strength index CI of the poor quality coal is further measured, and the caking strength index CI and the blending ratio X of the poor quality coal in the poor quality coal Is a factor that inhibits strength expression, and the relationship between the factor and the interparticle adhesion effect (correction value) on the poor quality coal is obtained in advance.
配合炭中の膨張比容積(ＳＶ’)が閾値（Ｔ）以下の劣質炭について、上記（ｃ２）と同様に、配合率Ｘ及び粘結力指数ＣＩに対する表面破壊強度（ＤＩ150 6）の実測値と推定値と誤差（ＤＩ150 6実計差）の関係を求め、次に、劣質炭の配合率Ｘに対するＤＩ150 6実計差の関係及び劣質炭の粘結力指数ＣＩに対するＤＩ150 6実計差の関係において、該関係を表現できる粒子間接着影響（補正値）の式の関数形を決める。そして、その関数を用いて補正値を求める。
用いる関数形は任意であり、前記（４）式の形に限定されるものではないが、（４）式を用いる場合は、定数ｆ、ｇ、ｈは試行錯誤的に求めることができ、本実験結果からはｆ＝−１３．９７、ｇ＝０．３５、ｈ＝−０．３９であった。
Measurement of surface fracture strength (DI 150 6 ) with respect to blending ratio X and cohesive strength index CI in the same manner as in (c2) above for inferior coal with an expansion specific volume (SV ′) equal to or less than the threshold (T) in blended coal Next, the relationship between the estimated value and the error (DI 150 6 actual difference) is obtained, and then the DI 150 6 actual difference with respect to the blend ratio X of the poor quality coal and the DI 150 6 with respect to the caking strength index CI of the poor quality coal. In relation to the actual difference, the function form of the expression of the interparticle adhesion effect (correction value) that can express the relation is determined. Then, a correction value is obtained using the function.
The function form to be used is arbitrary and is not limited to the form of the formula (4). However, when the formula (4) is used, the constants f, g, and h can be obtained by trial and error. From the experimental results, f = −13.97, g = 0.35, and h = −0.39.
上記のように、実際に使用を想定している劣質炭の性状範囲において、上記関係を求める試験を実施し、粒子間接着影響を式化しておけば、使用に際して劣質炭の膨張比容積ＳＶ’を（３）式を導出する際の条件にて測定し、膨張比容積SV’の閾値Ｔに応じて（３）式あるいは（４）式を選択し用いるのみで、粒子間接着影響を評価することができる。 As described above, in the property range of inferior quality coal that is actually assumed to be used, if the test for obtaining the above relationship is performed and the interparticle adhesion effect is formulated, the expansion specific volume SV ′ of the inferior quality coal in use. Is evaluated under the conditions for deriving equation (3), and the influence of adhesion between particles is evaluated only by selecting and using equation (3) or (4) according to the threshold value T of the expansion specific volume SV ′. be able to.
＜（ｄ）用いる配合炭中の粘結炭に基づく表面破壊強度の推定＞
用いる配合炭中の粘結炭に基づく表面破壊強度を、その膨張比容積と装入嵩密度との積から空隙充填度を求め、該空隙充填度と（ａ）の関係から推定する。なお、粘結炭が複数銘柄の石炭を含む場合には、粘結炭の膨張比容積は、各石炭の膨張比容積を配合比率で加重平均して求めることができる。
<(D) Estimation of surface fracture strength based on caking coal in blended coal used>
The surface fracture strength based on the caking coal in the blended coal to be used is determined from the relationship between the degree of void filling and (a) by obtaining the degree of void filling from the product of its expansion specific volume and charged bulk density. In addition, when caking coal contains several brands of coal, the expansion specific volume of caking coal can be calculated | required by carrying out the weighted average of the expansion specific volume of each coal with a compounding ratio.
また、非微粘結炭及び劣質炭は、粘結炭よりも再固化温度が低いものが多く、粘結炭が軟化溶融しているときには、非微粘結炭及び劣質炭は既に再固化しており、粘結炭の膨張が抑制される。そこで、特許文献２に開示されるように、非微粘結炭及び劣質炭の配合率に対して、粘結炭の膨張抑制効果をイナートファクターＩＦとして式化しておき、粘結炭の膨張比容積にイナートファクターＩＦを掛けて、空隙充填度を求める際の膨張比容積としてもよい。これにより、粘結炭に基づく表面破壊強度の推定値の正確性を向上させることができるため好ましい。 In addition, non-slightly caking coal and inferior coal often have a lower resolidification temperature than caking coal, and when caking coal is softened and melted, non-slightly caking coal and inferior coal have already been resolidified. The expansion of caking coal is suppressed. Therefore, as disclosed in Patent Document 2, the expansion suppression effect of caking coal is formulated as an inert factor IF for the blending ratio of non-slightly caking coal and inferior coal, and the expansion ratio of caking coal It is good also as an expansion specific volume at the time of calculating | requiring a void filling degree by multiplying an inert factor IF to a volume. Thereby, since the accuracy of the estimated value of the surface fracture strength based on caking coal can be improved, it is preferable.
＜（ｅ）用いる配合炭中の劣質な石炭に基づく表面破壊強度の推定＞
劣質な石炭に基づく表面破壊強度を、その膨張比容積と装入嵩密度との積から空隙充填度を求め、該空隙充填度と（ｂ）の関係から推定する。なお、非微粘結炭が複数銘柄の石炭を含む場合には、非微粘結炭の膨張比容積は、各石炭の膨張比容積を配合比率で加重平均して求めることができる。
<(E) Estimation of surface fracture strength based on inferior coal in blended coal used>
The surface fracture strength based on inferior coal is estimated from the relationship between the degree of void filling and (b) by obtaining the degree of void filling from the product of the expansion specific volume and the charge bulk density. In the case where the non-slightly caking coal includes a plurality of brands of coal, the expansion specific volume of the non-slightly caking coal can be obtained by weighted averaging the expansion specific volume of each coal by the blending ratio.
＜（ｆ）用いる配合炭中の劣質炭について補正値の導出＞
（f1）用いる劣質炭について、３℃／分よりも高い所定の昇温速度（v’）で測定した高速昇温膨張比容積（SV’）が閾値（Ｔ）よりも大きい場合、当該膨張比容積ＳV’と劣質な石炭中の当該劣質炭の配合率を求める。そして、膨張比容積及び劣質炭の配合率と、前記（ｃ２）の関係とから、粒子間接着影響（補正値１）を求める。なお、３℃／分よりも高い昇温速度としては、６℃／分が好ましく、１２℃／分がより好ましい。
<(F) Derivation of correction value for inferior coal in blended coal used>
(F1) When the high-temperature temperature-expansion expansion specific volume (SV ′) measured at a predetermined temperature increase rate (v ′) higher than 3 ° C./min is greater than the threshold (T), the expansion ratio The volume SV ′ and the blending ratio of the inferior coal in the inferior coal are obtained. And the adhesion effect between particles (correction value 1) is calculated | required from the expansion specific volume, the compounding rate of inferior charcoal, and the relationship of said (c2). In addition, as a temperature increase rate higher than 3 degree-C / min, 6 degree-C / min is preferable and 12 degree-C / min is more preferable.
また、１２℃／分でも劣質炭間の高速昇温膨張比容積の差が大きくない場合は、さらに高速で昇温してもよく、例えば、５０℃／分、さらには１００℃／分が例示できる。
この様に、大きな昇温速度として、例えば、１００℃／分で高速昇温膨張比容積を測定する場合は、特開２０１４−０１９８１４号公報に開示されている方法が推奨される。すなわち、劣質炭を細管に入れ、この細管にピストンを挿入し、少なくとも４００℃に達した時点から５００℃に達するまでの間の平均昇温速度が１００℃／分になるように、５５０℃に保持した加熱炉に細管を装入し、その際のピストンの変位量を測定し、この変位量から膨張率を求め、この膨張率から求める方法が、推奨される。
Further, when the difference in high-temperature temperature-expansion specific volume between inferior coals is not large even at 12 ° C./min, the temperature may be increased at a higher rate, for example, 50 ° C./min, and further 100 ° C./min. it can.
As described above, for example, in the case of measuring the rapid temperature increase / expansion specific volume at 100 ° C./min as a large temperature increase rate, the method disclosed in Japanese Patent Application Laid-Open No. 2014-019814 is recommended. That is, inferior charcoal is put into a thin tube, a piston is inserted into this thin tube, and the temperature is increased to 550 ° C. so that the average rate of temperature increase from the time when it reaches 400 ° C. to 500 ° C. is 100 ° C./min. A method is recommended in which a thin tube is inserted into the held heating furnace, the displacement amount of the piston at that time is measured, the expansion rate is obtained from the displacement amount, and the expansion rate is obtained from the expansion rate.
なお、３℃／分よりも高い所定の昇温速度（v’）で測定した高速昇温膨張比容積（ＳＶ’）が閾値（Ｔ）よりも大きい劣質炭として、高速昇温膨張比容積（ＳＶ’）の上限は特に限定されない。但し、例えば、１２℃／分で測定した場合に１．３５よりも大きい劣質炭は、従来推定値との差があまり大きくないことから、高速昇温膨張比容積（ＳＶ’）の１２℃／分での好ましい上限値としては１．３５が例示される。 In addition, the high-speed temperature-expansion expansion specific volume (SV ') is an inferior coal having a high-speed temperature-expansion expansion specific volume (SV') measured at a predetermined temperature increase rate (v ') higher than 3 ° C / min. The upper limit of SV ′) is not particularly limited. However, for example, inferior coal larger than 1.35 when measured at 12 ° C./min is not so large from the conventional estimated value, and therefore, the high temperature rising expansion specific volume (SV ′) of 12 ° C. / A preferred upper limit in minutes is exemplified by 1.35.
（f2）一方、用いる劣質炭について、３℃／分よりも高い所定の昇温速度（v’）で測定した高速昇温膨張比容積（SV’）が閾値（Ｔ）以下の場合、当該劣質炭について、粘結力指数（ＣＩ）を求め、また、劣質な石炭中の劣質炭の配合率を求める。そして、粘結力指数（ＣＩ）及び劣質炭の配合率と、前記（ｃ３）の関係とから、粒子間接着影響（補正値２）を求める。 (F2) On the other hand, when the high temperature heating expansion specific volume (SV ′) measured at a predetermined heating rate (v ′) higher than 3 ° C./min is less than the threshold (T), About charcoal, caking force index (CI) is calculated | required and the compounding rate of inferior quality coal in inferior quality coal is calculated | required. And the adhesion effect between particle | grains (correction value 2) is calculated | required from the compounding rate of caking force index (CI) and inferior charcoal, and the relationship of said (c3).
＜（ｇ）劣質な石炭に基づく表面破壊強度の補正推定値の導出＞
（ｅ）で求めた劣質な石炭に基づく表面破壊強度の推定値から、（ｆ）で求めた補正値１または補正値２を減じて、劣質な石炭に基づく表面破壊強度の補正推定値を求める。
<(G) Derivation of corrected estimated value of surface fracture strength based on poor quality coal>
By subtracting the correction value 1 or the correction value 2 obtained in (f) from the estimated value of the surface fracture strength based on the inferior coal obtained in (e), a corrected estimated value of the surface fracture strength based on the inferior coal is obtained. .
＜（ｈ）コークス表面破壊強度の推定＞
（ｄ）で求めた粘結炭に基づく表面破壊強度の推定値と、（ｇ）で求めた劣質な石炭に基づく表面破壊強度の補正推定値とを、用いる配合炭中の粘結炭と劣質な石炭の配合率で加重平均して、コークス表面破壊強度を推定する。
なお、求められたコークス表面破壊強度と、例えば、特許文献２に記載された方法に従い求められる体積破壊強度とから、ドラム強度ＤＩ150 15を推定してもよい。
<(H) Estimation of coke surface fracture strength>
The caking coal and the inferior quality in the blended coal using the estimated value of the surface breaking strength based on the caking coal obtained in (d) and the corrected estimated value of the surface breaking strength based on the inferior coal obtained in (g). Coke surface fracture strength is estimated by weighted averaging with the blending ratio of various coals.
The drum strength DI 150 15 may be estimated from the obtained coke surface breaking strength and the volume breaking strength obtained according to the method described in Patent Document 2, for example.
（粘結炭と劣質な石炭との配合比）
粘結炭と劣質な石炭との配合比は、特に限定されるものでないが、粘結炭と劣質な石炭に分けずに表面破壊強度を推定していた場合、配合炭中の劣質な石炭の配合率が３０質量％以上の場合、推定値の正確性が低かったため、本発明の推定法において、配合炭中の劣質な石炭の配合率を３０質量％以上としてもよい。より好ましくは配合率を４５質量％以上としてもよい。
(Compounding ratio of caking coal and poor quality coal)
The blending ratio of caking coal and inferior coal is not particularly limited, but when surface fracture strength is estimated without dividing caking coal and inferior coal, When the blending ratio is 30% by mass or more, the accuracy of the estimated value is low. Therefore, in the estimation method of the present invention, the blending ratio of inferior coal in the blended coal may be 30% by mass or more. More preferably, the blending ratio may be 45% by mass or more.
（劣質な石炭中の劣質炭の配合率）
劣質な石炭中の劣質炭の配合率は、特に限定されるものでないが、劣質な石炭中の劣質炭の配合率が１０質量％以上の場合、劣質な石炭の表面強度の推定値の正確性が低くなることがあるため、本発明の推定法において、劣質な石炭中の劣質炭の配合率を１０質量％以上としてもよい。
(Mixing ratio of inferior coal in inferior coal)
The mixing ratio of the inferior coal in the inferior coal is not particularly limited, but when the mixing ratio of the inferior coal in the inferior coal is 10% by mass or more, the accuracy of the estimated value of the surface strength of the inferior coal is accurate. Therefore, in the estimation method of the present invention, the blending ratio of the inferior coal in the inferior coal may be 10% by mass or more.
次に、本発明の実施例について説明するが、実施例での条件は、本発明の実施可能性及び効果を確認するために採用した一条件例であり、本発明は、この一条件例に限定されるものではない。本発明は、本発明の要旨を逸脱せず、本発明の目的を達成する限りにおいて、種々の条件を採用し得るものである。 Next, examples of the present invention will be described. The conditions in the examples are one example of conditions used for confirming the feasibility and effects of the present invention, and the present invention is based on this one example of conditions. It is not limited. The present invention can adopt various conditions as long as the object of the present invention is achieved without departing from the gist of the present invention.
まず、粘結炭、非微粘結炭及び４種の劣質炭を準備した。表４に、粘結炭、非微粘結炭及び劣質炭の揮発分量ＶＭ、全膨張率ＴＤ、及び、高速昇温膨張比容積ＳＶ’を示す（ここで、高速昇温膨張比容積ＳＶ’は１２℃／分の昇温速度で測定した。また、膨張比容積ＳＶ´の閾値（Ｔ）は１．２０である。）。粘結炭Ｙのビトリニット平均反射率Ｒｏは１．２４％で、非微粘結炭Ｃのビトリニット平均反射率Ｒｏは０．７０％である。 First, caking coal, non-slightly caking coal, and four types of inferior charcoal were prepared. Table 4 shows the volatile matter amount VM, the total expansion rate TD, and the high-temperature temperature-expanding specific volume SV ′ of the caking coal, non-slightly caking coal, and inferior coal (here, the high-speed temperature-rising expansion specific volume SV ′). Was measured at a heating rate of 12 ° C./min., And the threshold value (T) of the expansion specific volume SV ′ is 1.20.) The vitrinite average reflectance Ro of the caking coal Y is 1.24%, and the vitrinite average reflectance Ro of the non-slightly caking coal C is 0.70%.
表５に示す配合率において、石炭約９０ｋｇを有効寸法Ｗ４２０×Ｌ６１０×Ｈ４００ｍｍの焼成缶に充填し、０．８５ｔ／ｍ3（実機０．８０ｔ／ｍ3相当）の嵩密度で装入した後、試験コークス炉にて乾留した。そして、乾留後のコークスについて、表面破壊強度（ＤＩ150 6）を測定した。 In the blending ratio shown in Table 5, about 90 kg of coal was filled in a calcined can having an effective dimension of W420 × L610 × H400 mm and charged at a bulk density of 0.85 t / m 3 (equivalent to 0.80 t / m 3 of actual machine). Then, carbonization was carried out in a test coke oven. The surface fracture strength (DI 150 6 ) of the coke after dry distillation was measured.
予め粘結炭の空隙充填度とコークスの表面破壊強度との関係及び劣質な石炭の空隙充填度とコークスの表面破壊強度との関係を求めた。そして、粘結炭Ｙと、表５に示す配合率で、非微粘結炭Ｃと、劣質炭Ｄ１、Ｄ２、Ｄ３、Ｄ４、Ｄ５とが配合された劣質な石炭の膨張比容積と装入嵩密度を求め、それから求められた空隙充填度と、前記関係から、粘結炭と劣質な石炭それぞれに基づく表面破壊強度の推定値を得た。そして、コークスの表面破壊強度の推定値を次のように求めた。 The relationship between the degree of void filling of caking coal and the surface fracture strength of coke and the relationship between the degree of void filling of poor quality coal and the surface fracture strength of coke were obtained in advance. And the expansion specific volume and charging of the inferior coal in which the caking coal Y and the non-slightly caking coal C and the inferior coals D1, D2, D3, D4, and D5 are blended at the blending ratio shown in Table 5 The bulk density was obtained, and the estimated value of the surface fracture strength based on the caking coal and the inferior coal was obtained from the degree of void filling obtained therefrom and the above relationship. And the estimated value of the surface fracture strength of coke was calculated | required as follows.
比較例では、粘結炭に基づく表面破壊強度を、劣質な石炭による粘結炭の膨張抑制効果を考慮して、すなわちイナートファクターＩＦを粘結炭の膨張比容積に掛けたものから推定し、この粘結炭に基づく表面破壊強度の推定値と、劣質な石炭に基づく表面破壊強度の推定値とを、配合炭中の粘結炭と劣質な石炭の配合率で加重平均して、コークスの表面破壊強度の推定値を求めた。図６に、比較例のＤＩ150 6実測値とＤＩ150 6推定値との関係を示す。 In the comparative example, the surface fracture strength based on caking coal is estimated in consideration of the expansion suppressing effect of caking coal due to poor quality coal, that is, the inert factor IF is multiplied by the expansion specific volume of caking coal, The estimated value of the surface fracture strength based on the caking coal and the estimated value of the surface fracture strength based on the inferior coal are weighted and averaged by the blending ratio of the caking coal and the inferior coal in the blended coal. The estimated value of surface fracture strength was obtained. Figure 6 shows the relationship between DI 0.99 6 actual measured value and the DI 0.99 6 estimated value of the comparative example.
発明例では、１２℃／分で測定した膨張比容積ＳＶ’が１．２０超である劣質炭Ｄ１〜Ｄ４を配合したケースNo.１〜No.７については上記（３）式を、１２℃／分で測定したＳＶ’が１．２０以下である劣質炭Ｄ５を配合したケースNo.８については（４）式を用い、劣質炭の粒子間接着影響（補正値）を求め、劣質な石炭に基づく表面破壊強度の推定値から補正値を減じて補正推定値とし、劣質な石炭による粘結炭の膨張抑制効果を考慮、すなわちイナートファクターＩＦを粘結炭の膨張比容積に掛けたものから求めた粘結炭の表面破壊強度とを、劣質な石炭に基づく表面破壊強度の補正推定値とを配合炭中の粘結炭と劣質な石炭の配合率で加重平均して、コークスの表面破壊強度の推定値を求めた。図７に、発明例のＤＩ150 6実測値とＤＩ150 6推定値との関係を示す。 In invention example, the above-mentioned (3) type | formula is represented about 12 degreeC about case No.1-No.7 which mix | blended the inferior charcoal D1-D4 whose expansion specific volume SV 'measured at 12 degree-C / min is more than 1.20. For case No. 8 blended with inferior coal D5 whose SV ′ measured in 1 / min is 1.20 or less, the interparticle adhesion effect (correction value) of the inferior coal is obtained using equation (4), and the inferior coal Subtracting the correction value from the estimated value of the surface fracture strength based on the result, taking into consideration the effect of suppressing the expansion of caking coal due to poor quality coal, that is, by multiplying the expansion factor volume of caking coal by the inert factor IF The surface fracture strength of the coke obtained is weighted average of the corrected estimated value of the surface fracture strength based on the poor quality coal with the blending ratio of the caking coal and the poor quality coal in the blended coal, and the surface fracture of the coke. Intensity estimates were obtained. Figure 7 shows the relationship between DI 0.99 6 actual measured value and the DI 0.99 6 estimated value of the inventive example.
図６に示すように、比較例の表面破壊強度のＤＩ150 6推定値は、ＤＩ150 6実測値と大きく乖離している。それに対して、図７に示すように、発明例の表面破壊強度のＤＩ150 6推定値は、粒子間接着影響項を反映しているため、ＤＩ150 6実測値と非常に良く一致しており、劣質炭配合時の表面破壊強度急落に対する推定値の正確性が大幅に向上した。 As shown in FIG. 6, the DI 150 6 estimated value of the surface fracture strength of the comparative example is significantly different from the DI 150 6 measured value. On the other hand, as shown in FIG. 7, the estimated value of DI 150 6 for the surface fracture strength of the inventive example reflects the interparticle adhesion effect term, and therefore agrees very well with the measured value of DI 150 6. The accuracy of the estimated value for the sudden drop in surface fracture strength when blending with inferior coal was greatly improved.
本発明によれば、劣質炭に関する粒子間接着影響を補正値として、劣質な石炭に基づく表面破壊強度の推定値から減じるので、劣質炭を配合した配合炭を用いて製造するコークスの表面破壊強度を正確に推定することができる。よって、本発明は、産業上の利用可能性が高いものである。 According to the present invention, the effect of interparticle adhesion on inferior coal is used as a correction value, and is subtracted from the estimated value of surface fracture strength based on inferior coal, so the surface fracture strength of coke produced using a blended coal blended with inferior coal. Can be estimated accurately. Therefore, the present invention has high industrial applicability.
Claims (2)
前記配合炭は、ビトリニット平均反射率Ｒｏが０.８％以上、ＪＩＳ Ｍ ８８０１で規定される方法によって測定される全膨張率が０％超の粘結炭、及び、劣質な石炭として、ビトリニット平均反射率Ｒｏが０.８％未満で当該全膨張率が０％超の非微粘結炭と当該全膨張率が０％の劣質炭からなり、
（ａ）予め、複数の粘結炭の膨張比容積と装入嵩密度との積から求められる空隙充填度と、得られるコークスの表面破壊強度との関係を求め、
（ｂ）予め、複数の非微粘結炭と劣質炭とを配合した劣質な石炭の膨張比容積と装入嵩密度との積から求められる空隙充填度と、得られるコークスの表面破壊強度との関係を求め、
（ｃ）予め、劣質炭の強度発現阻害要因と粒子間接着影響の補正値との関係を以下のようにして求め、
（c1）劣質炭を３℃／分よりも高い所定の昇温速度で昇温したときの膨張比容積を高速昇温膨張比容積ＳV’として測定し、
（c2）測定した劣質炭の膨張比容積ＳV’が閾値Ｔよりも大きい場合、予め、当該膨張比容積ＳV’と劣質な石炭中の当該劣質炭の配合率とを強度発現阻害要因とし、その要因に基づく劣質炭に関する粒子間接着影響を補正値１とする相互の関係を求め、
（c3）測定した劣質炭の膨張比容積ＳV’が前記閾値Ｔ以下の場合、さらに当該劣質炭の粘結力指数ＣＩを測定し、予め、測定した粘結力指数ＣＩと劣質な石炭中の当該劣質炭の配合率とを強度発現阻害要因とし、その要因に基づく劣質炭に関する粒子間接着影響を補正値２とする相互の関係を求め、
コークスの表面破壊強度の推定にあたり、
（ｄ）用いる配合炭中の粘結炭の空隙充填度を同様に求め、前記（ａ）の関係から当該粘結炭に基づく表面破壊強度の推定値を求め、
（ｅ）用いる配合炭中の劣質な石炭の空隙充填度を同様に求め、前記（ｂ）の関係から当該劣質な石炭に基づく表面破壊強度の推定値を求め、
（ｆ）用いる配合炭中の劣質炭の膨張比容積ＳV’を求め、前記閾値Ｔとの関係に応じて、以下のようにして補正値を求め、
（f1）用いる配合炭中の劣質炭の膨張比容積ＳV’が前記閾値Ｔよりも大きい場合は、当該膨張比容積ＳV’と劣質な石炭中の当該劣質炭の配合率を求め、前記（c2）の関係から補正値１を求め、
（f2）用いる配合炭中の劣質炭の膨張比容積ＳV’が前記閾値Ｔ以下の場合は、当該膨張比容積ＳV’と劣質な石炭中の当該劣質炭の配合率を求め、前記（c3）の関係から補正値２を求め、
（ｇ）前記（ｅ）で求めた劣質な石炭に基づく表面破壊強度の推定値から、劣質炭の膨張比容積ＳV’に応じて、前記（f1）または（f2）で求めた補正値１または補正値２を減じて劣質な石炭に基づく表面破壊強度の補正推定値を求め、
（ｈ）前記（ｄ）で求めた粘結炭に基づく表面破壊強度の推定値と、前記（ｇ）で求めた劣質な石炭に基づく表面破壊強度の補正推定値とを、用いる配合炭中の粘結炭と劣質な石炭の配合率で加重平均する
ことを特徴とするコークス表面破壊強度の推定方法。 In the method for estimating the surface fracture strength of coke produced using blended coal blended with inferior coal,
The blended coal is a caking coal having a vitrinite average reflectance Ro of 0.8% or more and a total expansion coefficient of more than 0% measured by a method defined in JIS M 8801. A non-slightly caking coal having a reflectance Ro of less than 0.8% and a total expansion rate of more than 0% and an inferior coal having a total expansion rate of 0%,
(A) In advance, obtain the relationship between the degree of void filling obtained from the product of the expansion specific volume and charging bulk density of a plurality of caking coal, and the surface fracture strength of the resulting coke,
(B) The degree of void filling obtained from the product of the expansion specific volume and the charge bulk density of inferior coal previously blended with a plurality of non-slightly caking coal and inferior coal, and the surface fracture strength of the resulting coke. Seeking a relationship
(C) In advance, the relationship between the factor for inhibiting the strength expression of the inferior coal and the correction value for the interparticle adhesion effect is determined as follows,
(C1) The expansion specific volume when the inferior coal is heated at a predetermined temperature increase rate higher than 3 ° C./min is measured as a high-speed temperature increase expansion specific volume SV ′.
(C2) When the measured expansion specific volume SV ′ of the inferior coal is larger than the threshold value T, the expansion specific volume SV ′ and the blending ratio of the inferior coal in the inferior coal are set as strength development inhibiting factors in advance. Find the mutual relationship with the inter-particle adhesion effect on the poor coal based on the factor as the correction value 1,
(C3) When the measured expansion specific volume SV ′ of the inferior coal is equal to or less than the threshold T, the caking strength index CI of the inferior coal is further measured, and the caking strength index CI measured in advance and the inferior coal Using the blending ratio of the inferior charcoal as a factor that inhibits strength expression, and determining the mutual relationship between the interparticle adhesion effects on the inferior charcoal based on that factor as the correction value 2,
In estimating the surface fracture strength of coke,
(D) Finding the degree of void filling of caking coal in the blended coal to be used in the same manner, obtaining an estimated value of surface fracture strength based on the caking coal from the relationship of (a),
(E) The void filling degree of the poor quality coal in the blended coal to be used is similarly determined, and the estimated value of the surface fracture strength based on the poor quality coal is obtained from the relationship (b),
(F) Obtain the expansion specific volume SV ′ of the inferior coal in the blended coal to be used, and obtain the correction value as follows according to the relationship with the threshold value T,
(F1) When the expansion specific volume SV ′ of the inferior coal in the blended coal to be used is larger than the threshold value T, the ratio of the expansion specific volume SV ′ and the inferior coal in the inferior coal is obtained, and (c2 ) To obtain a correction value of 1
(F2) When the expansion specific volume SV ′ of the inferior coal in the blended coal to be used is equal to or less than the threshold value T, the expansion specific volume SV ′ and the blending ratio of the inferior coal in the inferior coal are obtained, and (c3) The correction value 2 is obtained from the relationship of
(G) From the estimated value of the surface fracture strength based on the inferior coal obtained in (e), the correction value 1 obtained in (f1) or (f2) or according to the expansion specific volume SV ′ of the inferior coal Subtract correction value 2 to obtain a corrected estimate of surface fracture strength based on inferior coal,
(H) In the blended coal using the estimated value of the surface fracture strength based on the caking coal obtained in (d) and the corrected estimated value of the surface fracture strength based on the inferior coal obtained in (g). A method for estimating the coke surface fracture strength, characterized by performing weighted averaging with a blending ratio of caking coal and inferior coal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016179470 | 2016-09-14 | ||
| JP2016179470 | 2016-09-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2018048297A true JP2018048297A (en) | 2018-03-29 |
| JP6874502B2 JP6874502B2 (en) | 2021-05-19 |
Family
ID=61765979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2017083895A Active JP6874502B2 (en) | 2016-09-14 | 2017-04-20 | Coke strength estimation method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP6874502B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020026472A (en) * | 2018-08-10 | 2020-02-20 | 日本製鉄株式会社 | Estimation method of surface fracture strength of coke |
| JP2021042378A (en) * | 2019-09-06 | 2021-03-18 | 日本製鉄株式会社 | Method for estimating coal inert factor coefficient and method for estimating coke surface fracture strength |
| JP7255766B1 (en) * | 2021-12-09 | 2023-04-11 | Ｊｆｅスチール株式会社 | Coal grinding method and grinding equipment |
| WO2023106090A1 (en) * | 2021-12-09 | 2023-06-15 | Ｊｆｅスチール株式会社 | Coal grinding method and grinding facility |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002121565A (en) * | 2000-10-13 | 2002-04-26 | Nippon Steel Corp | Estimation method of surface fracture strength of coke |
| JP2005194358A (en) * | 2004-01-06 | 2005-07-21 | Nippon Steel Corp | Coke strength estimation method |
| JP2014019814A (en) * | 2012-07-20 | 2014-02-03 | Nippon Steel & Sumitomo Metal | Strength estimation method of formed coke |
| JP2016069469A (en) * | 2014-09-29 | 2016-05-09 | 新日鐵住金株式会社 | Estimation method for coke strength |
| JP2016079326A (en) * | 2014-10-20 | 2016-05-16 | 新日鐵住金株式会社 | Method for producing coke |
-
2017
- 2017-04-20 JP JP2017083895A patent/JP6874502B2/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002121565A (en) * | 2000-10-13 | 2002-04-26 | Nippon Steel Corp | Estimation method of surface fracture strength of coke |
| JP2005194358A (en) * | 2004-01-06 | 2005-07-21 | Nippon Steel Corp | Coke strength estimation method |
| JP2014019814A (en) * | 2012-07-20 | 2014-02-03 | Nippon Steel & Sumitomo Metal | Strength estimation method of formed coke |
| JP2016069469A (en) * | 2014-09-29 | 2016-05-09 | 新日鐵住金株式会社 | Estimation method for coke strength |
| JP2016079326A (en) * | 2014-10-20 | 2016-05-16 | 新日鐵住金株式会社 | Method for producing coke |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020026472A (en) * | 2018-08-10 | 2020-02-20 | 日本製鉄株式会社 | Estimation method of surface fracture strength of coke |
| JP7070228B2 (en) | 2018-08-10 | 2022-05-18 | 日本製鉄株式会社 | Estimating method of surface fracture strength of coke |
| JP2021042378A (en) * | 2019-09-06 | 2021-03-18 | 日本製鉄株式会社 | Method for estimating coal inert factor coefficient and method for estimating coke surface fracture strength |
| JP7553785B2 (en) | 2019-09-06 | 2024-09-19 | 日本製鉄株式会社 | Method for estimating the inert factor coefficient of coal and the surface destructive strength of coke |
| JP7255766B1 (en) * | 2021-12-09 | 2023-04-11 | Ｊｆｅスチール株式会社 | Coal grinding method and grinding equipment |
| WO2023106090A1 (en) * | 2021-12-09 | 2023-06-15 | Ｊｆｅスチール株式会社 | Coal grinding method and grinding facility |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6874502B2 (en) | 2021-05-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4691212B2 (en) | Coal expansion rate measurement method, coal specific volume estimation method, void filling degree measurement method, and coal blending method | |
| JP2018048297A (en) | Coke strength estimation method | |
| JP6379934B2 (en) | Coke strength estimation method | |
| TWI608092B (en) | Coal evaluation method and coke production method | |
| JP2010209310A (en) | Method for measuring specific volume of blended coal, estimation method of coke surface fracture strength and coal blending method | |
| JP4299680B2 (en) | Coke strength estimation method | |
| JP6065510B2 (en) | Method of blending coke raw material for blast furnace | |
| JP6227482B2 (en) | Method for producing blast furnace coke and blast furnace coke | |
| JP5820668B2 (en) | Method for estimating maximum fluidity of raw material for coke production, blending method for raw material for coke production, and raw material for coke production produced by the blending method | |
| JP6007958B2 (en) | Coke production method | |
| JP5833473B2 (en) | Coke production raw material production method and coke production raw material produced by the production method | |
| JP7070228B2 (en) | Estimating method of surface fracture strength of coke | |
| JP2017171718A (en) | Intensity estimation method of coke and manufacturing method of coke | |
| JP5163247B2 (en) | Coke production method | |
| JP7188245B2 (en) | Method for estimating surface fracture strength of blast furnace coke | |
| JP4888452B2 (en) | Method for producing blast furnace coke | |
| JP5833474B2 (en) | Coke production raw material production method and coke production raw material produced by the production method | |
| JP2021042378A (en) | Method for estimating coal inert factor coefficient and method for estimating coke surface fracture strength | |
| KR101887320B1 (en) | Method for deciding blending amount of ash-free coal, and process for producing coke for blast furnace | |
| JP6678095B2 (en) | Coke strength estimation method and coke production method | |
| JP2025049796A (en) | Coke manufacturing method | |
| WO2013129650A1 (en) | Process for producing raw material for coke production, and raw material for coke production produced by said process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20191204 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20201016 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20201020 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20201218 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20210323 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20210405 |
|
| R151 | Written notification of patent or utility model registration |
Ref document number: 6874502 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R151 |