JPH06147404A - Boiler furnace monitoring method and device - Google Patents
Boiler furnace monitoring method and deviceInfo
- Publication number
- JPH06147404A JPH06147404A JP29890392A JP29890392A JPH06147404A JP H06147404 A JPH06147404 A JP H06147404A JP 29890392 A JP29890392 A JP 29890392A JP 29890392 A JP29890392 A JP 29890392A JP H06147404 A JPH06147404 A JP H06147404A
- Authority
- JP
- Japan
- Prior art keywords
- corrosion
- sample
- boiler
- furnace
- water wall
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000012544 monitoring process Methods 0.000 title claims abstract description 10
- 238000005260 corrosion Methods 0.000 claims abstract description 48
- 230000007797 corrosion Effects 0.000 claims abstract description 48
- 238000002485 combustion reaction Methods 0.000 claims abstract description 10
- 239000000446 fuel Substances 0.000 claims abstract description 9
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 6
- 239000011593 sulfur Substances 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 36
- 238000001816 cooling Methods 0.000 claims description 7
- 239000004071 soot Substances 0.000 claims description 3
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 abstract description 7
- 239000007789 gas Substances 0.000 description 17
- 238000005259 measurement Methods 0.000 description 12
- 238000012806 monitoring device Methods 0.000 description 11
- 238000009529 body temperature measurement Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 238000009841 combustion method Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000005486 sulfidation Methods 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 239000002803 fossil fuel Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 229910000809 Alumel Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 229910001179 chromel Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910001120 nichrome Inorganic materials 0.000 description 1
- 239000010742 number 1 fuel oil Substances 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ボイラの火炉を監視す
る方法および装置に係り、特に水壁管の腐食による減肉
の発生の有無および進展度合いを監視することのできる
ボイラ火炉監視方法および装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for monitoring a boiler furnace, and more particularly to a boiler furnace monitoring method and method capable of monitoring the presence or absence and the degree of progress of wall thinning due to corrosion of water wall pipes. It relates to the device.
【０００２】[0002]
【従来の技術】石炭や重油等の化石燃料を使用するボイ
ラ装置では、燃焼によって窒素酸化物（以下、ＮＯｘと
いう）が発生することが知られている。このＮＯｘを低
減する方法としては、燃焼の際発生するＮＯｘ量、すな
わちＮＯｘ発生量そのものを低減する方法と、発生した
ＮＯｘを分解、除去する方法に大別される。前者は高温
かつ酸素濃度の高い状態で発生するサーマルＮＯｘを低
減する方法で、低ＮＯｘバーナによる燃焼法、２段燃焼
法が有効とされており、燃料リッチの還元性ガスを発生
させることによりＮＯｘ量の低減を図るものである。2. Description of the Related Art It is known that nitrogen oxides (hereinafter referred to as NOx) are generated by combustion in a boiler device that uses fossil fuel such as coal or heavy oil. The methods for reducing the NOx are roughly classified into a method of reducing the NOx amount generated during combustion, that is, a NOx generation amount itself, and a method of decomposing and removing the generated NOx. The former is a method of reducing thermal NOx generated at a high temperature and a high oxygen concentration, and a combustion method using a low NOx burner and a two-stage combustion method are effective, and NOx is generated by generating a fuel-rich reducing gas. It is intended to reduce the amount.
【０００３】一方、化石燃料には硫黄（Ｓ）分が含まれ
ており、サーマルＮＯｘを低減するために燃料リッチの
還元性ガスを生成させて低ＮＯｘ化を図ろうとすると、
生成した還元性ガス中にＨ2 ＳやＣＯＳ等の腐食性の強
い成分が含まれるようになり、通常の酸化性ガスに較べ
て腐食性が強くなり、例えばボイラ装置の水壁管で腐食
が発生するという問題が生じる。On the other hand, fossil fuels contain sulfur (S), and in order to reduce thermal NOx, a fuel-rich reducing gas is produced to reduce NOx.
The generated reducing gas contains a highly corrosive component such as H 2 S and COS, and becomes more corrosive than a normal oxidizing gas. For example, the water wall pipe of a boiler device is corroded. The problem occurs.
【０００４】一般にボイラ装置の水壁管としては炭素
鋼、低合金Ｃｒ−Ｍｏ鋼が使用されており、水壁管で腐
食が生じる位置はバーナ近傍である。また、発明者のこ
れまでの研究結果によると、腐食部位表面には硫化物ス
ケール（ＦｅＳ）が形成されていることが特徴で、その
表面にはカーボンやパーライト（ＦｅＳ2 ）を含む未燃
粒子が多数付着している。このことから、腐食機構とし
ては燃焼火炎の水壁管への直撃による還元性雰囲気の形
成および未燃分の付着による硫化の促進が挙げられる。
また、アルカリ成分やＳ分の多い燃料を使用する場合に
は水壁管表面に低融点化合物が形成され腐食が促進され
る。Generally, carbon steel and low alloy Cr-Mo steel are used as the water wall pipe of the boiler apparatus, and the position where corrosion occurs in the water wall pipe is near the burner. In addition, according to the results of the research conducted by the inventor, the characteristic feature is that sulfide scale (FeS) is formed on the surface of the corroded portion, and unburned particles containing carbon and pearlite (FeS 2 ) are formed on the surface. Are attached. From this, the corrosion mechanism includes formation of a reducing atmosphere by direct hit of the combustion flame to the water wall tube and promotion of sulfidation by adhesion of unburned components.
Further, when a fuel containing a large amount of alkaline components or S is used, a low melting point compound is formed on the surface of the water wall tube, and corrosion is promoted.
【０００５】このような水壁管の硫化腐食の発生および
進展速度は燃焼条件と密接に関係する。しかし、燃焼条
件は使用燃料により種々変化するため、水壁管の減肉を
防止または軽減するためには、水壁管近傍の環境変化を
監視し、燃焼方法を最適化する必要がある。Occurrence and progress rate of sulfide corrosion of such a water wall tube are closely related to combustion conditions. However, since the combustion conditions vary depending on the fuel used, it is necessary to monitor the environmental changes in the vicinity of the water wall tube and optimize the combustion method in order to prevent or reduce the wall thinning of the water wall tube.
【０００６】[0006]
【発明が解決しようとする課題】そうした監視装置とし
ては、例えば特願平２−２６７８６１“ボイラ装置およ
びその運転方法”に記載されているような酸素センサー
により水壁管表面の酸素分圧を測定する方法がある。し
かしながら、火炎の温度が通常１０００℃以上になるこ
と、ガスにはＨ2 ＳやＣＯＳといった腐食性ガスが含ま
れていることから、市販の酸素センサーでは長時間の使
用に耐えることができないといった問題点がある。さら
に上記方法は材料の腐食量を直接測定する方法でないた
め、測定データと材料の腐食量は必ずしも対応しないと
いう問題点がある。As such a monitoring device, for example, the oxygen partial pressure on the surface of the water wall tube is measured by an oxygen sensor as described in Japanese Patent Application No. 2-267861 "Boiler device and its operating method". There is a way to do it. However, since the flame temperature is usually 1000 ° C. or higher and the gas contains corrosive gases such as H 2 S and COS, the commercially available oxygen sensor cannot withstand long-term use. There is a point. Further, since the above method is not a method of directly measuring the amount of corrosion of the material, there is a problem that the measured data and the amount of corrosion of the material do not necessarily correspond.
【０００７】本発明の目的は、上記従来技術の問題点を
解決し、低ＮＯｘ燃焼による水壁管の腐食の発生の有無
および進展速度を定量的に監視するボイラ火炉監視方法
および装置を提供することを目的とする。An object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a boiler furnace monitoring method and apparatus for quantitatively monitoring the presence or absence of corrosion of a water wall pipe due to low NOx combustion and the progress rate thereof. The purpose is to
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するため
本願の第１の発明は、硫黄成分を含む燃料を使用するボ
イラ水壁部火炉内にさらして設けた試料を冷却手段によ
り所定温度に制御し、該試料近傍のガス温度を測定する
とともに、この試料に電流を流して試料両端の電圧を計
測することにより試料の腐食の発生または腐食量または
腐食速度を検知し、これに基づきバーナの燃焼条件の変
更、またはスートブロアの作動を指示するようにしたこ
とを特徴とするボイラ火炉内監視方法に関する。In order to achieve the above object, the first invention of the present application is to bring a sample, which is provided by being exposed in a boiler water wall furnace using a fuel containing a sulfur component, to a predetermined temperature by a cooling means. Controlling, measuring the gas temperature in the vicinity of the sample, and detecting the corrosion of the sample or the corrosion amount or the corrosion rate of the sample by measuring the voltage across the sample by passing a current through this sample, and based on this, the burner The present invention relates to a method for monitoring the inside of a boiler furnace, characterized in that a change in combustion conditions or an operation of a soot blower is instructed.
【０００９】本願の第２の発明は、硫黄分を含む燃料を
使用するボイラの火炉内水壁近傍のガス温度を測定する
手段と、火炉内にさらして設けた試料と、該試料の電気
抵抗の変化から腐食の発生または腐食量もしくは腐食速
度を測定する手段とを前記ボイラの水壁部に設けたこと
を特徴とするボイラ火炉内監視装置に関する。A second invention of the present application is a means for measuring a gas temperature near a water wall in a furnace of a boiler using a fuel containing sulfur, a sample exposed in the furnace, and an electric resistance of the sample. And a means for measuring the amount of corrosion or the amount of corrosion or the corrosion rate from the change in the water temperature of the boiler.
【００１０】[0010]
【作用】電圧Ｖ、電流Ｉ、抵抗Ｒの間には（１）式のオ
ームの法則が成り立つ。The Ohm's law of the equation (1) is established between the voltage V, the current I, and the resistance R.
【００１１】[0011]
【数１】Ｖ＝Ｒ・Ｉ …（１） また、抵抗Ｒは(1) V = R · I (1) Further, the resistance R is
【００１２】[0012]
【数２】Ｒ＝ρ・ｌ／ｓ …（２） ｌ：試料の長さ、ｓ：断面積、ρ：比抵抗 であるから、電圧Ｖは## EQU00002 ## R = .rho..multidot.l / s (2) where l is the length of the sample, s is the cross-sectional area, and ρ is the specific resistance.
【００１３】[0013]
【数３】Ｖ＝ρ・ｌ・Ｉ／ｓ …（３） で与えられる。比抵抗ρは寸法に無関係の物質定数であ
るから、試料に一定の電流Ｉを流して端子間の電圧Ｖを
測定すれば、試料の電気抵抗Ｒを測定することができ
る。電気抵抗Ｒは試料の断面積ｓの逆数１／ｓに比例す
る。したがって腐食で断面積が低下すると電気抵抗は増
加する。## EQU3 ## V = ρlI / s (3) Since the specific resistance ρ is a material constant irrelevant to the size, the electric resistance R of the sample can be measured by flowing a constant current I through the sample and measuring the voltage V between the terminals. The electric resistance R is proportional to the reciprocal 1 / s of the cross-sectional area s of the sample. Therefore, when the cross-sectional area decreases due to corrosion, the electric resistance increases.
【００１４】ボイラの水壁管は通常酸化雰囲気で、メタ
ル温度も４００℃程度であることから、腐食による断面
積ｓの低下はほとんどない。しかし、火炎が直撃し硫化
腐食が発生すると、断面積ｓは低下し始める。硫化腐食
では、腐食により硫化物が試料表面に生成するが、この
硫化物は試料との密着性が悪く、容易に剥離する。この
ため、断面積の低下割合は時間に対してほぼ直線とな
り、硫化腐食が発生している間の試料の電圧Ｖは時間に
対してほぼ直線的に増加する。したがって、電圧の変化
を測定することによって、腐食の発生の有無および腐食
速度を測定することができる。Since the water wall tube of the boiler is usually in an oxidizing atmosphere and the metal temperature is about 400 ° C., the cross-sectional area s hardly decreases due to corrosion. However, when the flame hits directly and sulfide corrosion occurs, the cross-sectional area s starts to decrease. In sulfide corrosion, sulfide is generated on the surface of the sample due to corrosion, but this sulfide has poor adhesion to the sample and easily peels off. Therefore, the reduction rate of the cross-sectional area becomes almost linear with time, and the voltage V of the sample during the sulfide corrosion increases almost linearly with time. Therefore, by measuring the change in voltage, the presence or absence of corrosion and the corrosion rate can be measured.
【００１５】また、腐食の発生に大きく影響するのは火
炎が水壁管を直撃するかどうかであるが、火炎が直撃す
る場合には水壁管近傍のガス温度が上昇する。したがっ
て、上記電気抵抗の変化と合わせて、水壁管火炉側のガ
ス温度を測定することによって、水壁管の腐食進行度合
いを精度よく監視することが可能となる。さらに、この
測定信号に基づき、燃焼条件を最適化することによっ
て、水壁管の腐食を防止または大幅に軽減することがで
きる。Further, it is whether or not the flame directly hits the water wall pipe that has a great influence on the occurrence of corrosion. When the flame hits directly, the gas temperature near the water wall pipe rises. Therefore, by measuring the gas temperature on the water wall tube furnace side together with the change in the electric resistance, it becomes possible to accurately monitor the degree of corrosion progress of the water wall tube. Furthermore, by optimizing the combustion conditions based on this measurement signal, corrosion of the water wall tube can be prevented or greatly reduced.
【００１６】[0016]
【実施例】以下、本発明の一実施例を図面を参照にして
説明する。図１から図３に本発明の一実施例を示す。図
１は本発明の一実施例の構成および水壁管への設置方法
を説明する図で、図２は監視装置を火炉側から見た図
で、図３は図２のIII − III線矢視方向断面図である。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 3 show an embodiment of the present invention. FIG. 1 is a diagram for explaining the configuration of one embodiment of the present invention and a method for installing it on a water wall pipe, FIG. 2 is a diagram of a monitoring device viewed from the furnace side, and FIG. 3 is a line III-III of FIG. FIG.
【００１７】図１において、水壁を構成する水壁管１は
通常フィン２を介して接合される構造となっているが、
監視装置が水壁管と水壁管の間に設置され、監視装置の
表面が火炉へ露出する構造となっている。監視装置の外
管３には温度測定用熱電対４および５と電気抵抗測定用
試料６が設置されており、外管３の内部は冷却空気で常
時冷却されている。温度測定は水壁管近傍のガス温度を
測定する熱電対４と電気抵抗測定用試料６の温度を測定
する熱電対５から構成されている。熱電対としては白金
熱電対またはアルメルクロメル等が使用できるが、ガス
温度は通常１０００以上となるので、白金熱電対が有効
である。In FIG. 1, the water wall tube 1 constituting the water wall is usually joined by the fins 2.
The monitoring device is installed between the water wall pipes, and the surface of the monitoring device is exposed to the furnace. Thermocouples 4 and 5 for temperature measurement and a sample 6 for electrical resistance measurement are installed in the outer tube 3 of the monitoring device, and the inside of the outer tube 3 is constantly cooled by cooling air. The temperature measurement is composed of a thermocouple 4 for measuring the gas temperature near the water wall tube and a thermocouple 5 for measuring the temperature of the electrical resistance measurement sample 6. A platinum thermocouple or an alumel chromel can be used as the thermocouple, but the platinum thermocouple is effective because the gas temperature is usually 1000 or more.
【００１８】電気抵抗測定は４端子法で実施した。本方
法は電気抵抗測定用試料６の両端１３に一定の電流を流
し（図２参照）、試料両端１４の電圧を測定することに
よって試料６の電気抵抗を測定するものである。電気抵
抗測定試料用の材料としては（１）硫化腐食に対して敏
感なこと、（２）経年変化が小さいこと、（３）耐熱性
に優れることが必要となる。こうした条件を満足する材
料としては８０Ｎｉ２０Ｃｒに代表されるニクロムがよ
い。本材料の場合、試料温度が低いとほとんど腐食しな
いので、試料表面温度は７００〜８００℃程度になるよ
うに、冷却空気の温度を常時制御する必要がある。The electrical resistance was measured by the 4-terminal method. In this method, a constant current is applied to both ends 13 of the sample 6 for measuring electrical resistance (see FIG. 2), and the voltage at both ends 14 of the sample is measured to measure the electrical resistance of the sample 6. The material for the electrical resistance measurement sample must be (1) sensitive to sulfidation corrosion, (2) small in aging, and (3) excellent in heat resistance. Nichrome typified by 80Ni20Cr is preferable as a material satisfying such conditions. In the case of this material, if the sample temperature is low, it hardly corrodes, so it is necessary to constantly control the temperature of the cooling air so that the sample surface temperature is about 700 to 800 ° C.
【００１９】腐食速度を精度よく測定するためには電圧
の変化が大きいほどよい。このためにはできるだけ試料
の長さを長くし、反対に断面積を小さくするのが必要で
ある。そこで、本実施例では図２に示すように、試料を
コイル状にしている。また、試料は運転中の剥離を防止
し、さらに過熱を防止するために図３に示すような方法
で装置の外管３に密着されている。すなわち、外管に耐
熱性に優れた酸化物（例えば、アルミナやジルコニア）
をコーティングして酸化物層１５を設けた後、試料６を
設置し、さらにこの電気抵抗測定用試料６を固定するた
めに酸化物をコーティングし、その後表面を研磨し、電
気抵抗測定用試料６が表面に出るようにしている。上記
した温度および電圧の測定データはデータロガー８を介
してコンピュータ１０に収録できるようにしている。ま
た、メタル温度測定用熱電対５から入力された信号によ
り、コンピュータ１０は冷却空気の流量調節弁９を開閉
して、流量調整を行うようになっている。In order to measure the corrosion rate with high accuracy, the larger the change in voltage, the better. For this purpose, it is necessary to make the sample as long as possible and, conversely, to make the cross-sectional area small. Therefore, in this embodiment, the sample is coiled as shown in FIG. Further, the sample is adhered to the outer tube 3 of the apparatus in a manner as shown in FIG. 3 in order to prevent peeling during operation and further prevent overheating. That is, the outer tube has an oxide with excellent heat resistance (eg, alumina or zirconia).
Is coated to form the oxide layer 15, and then the sample 6 is placed. Further, the sample 6 for electrical resistance measurement is coated with oxide to fix the sample 6 for electrical resistance measurement, and then the surface is polished to obtain the sample 6 for electrical resistance measurement. Is exposed on the surface. The temperature and voltage measurement data described above can be recorded in the computer 10 via the data logger 8. Further, the computer 10 opens and closes the flow rate control valve 9 for the cooling air by the signal input from the thermocouple 5 for metal temperature measurement to adjust the flow rate.
【００２０】図４は、本発明の一実施例であるボイラ火
炉監視装置の実機ボイラ水壁管への取付け位置を示した
ものである。本実施例ではバーナ１９の高さの側壁に６
個取付けている。監視装置の設置位置２０は腐食が問題
となる部位、例えば左右側壁中央部でバーナ高さの位置
に設置するのがよいが、設置位置および数はボイラ構造
により異なるため、特に限定するものではない。FIG. 4 shows the mounting position of the boiler furnace monitoring device according to one embodiment of the present invention on the actual boiler water wall pipe. In this embodiment, 6 is provided on the side wall at the height of the burner 19.
I have installed one. The installation position 20 of the monitoring device is preferably installed at a site where corrosion is a problem, for example, at the burner height position at the center of the left and right side walls, but the installation position and the number differ depending on the boiler structure, and are not particularly limited. .
【００２１】次に、上記のように構成された本実施例の
使用例について説明する。図５はガス温度測定例であ
る。図５において、火炎が水壁管を直撃するとガス温度
の上昇が認められ（時間ａ）、水壁管が腐食環境にさら
されるようになったことがわかる。図６は試料６の電気
抵抗測定例である。火炎が直撃されない間は電気抵抗の
変化はほとんどないが、火炎が本監視装置を直撃するよ
うになると、徐々に電気抵抗が増加していく（ｃから
ｄ）。また、火炎が直撃しなくなると電気抵抗の上昇は
なくなる（ｄ）。Next, an example of use of the present embodiment configured as described above will be described. FIG. 5 is an example of gas temperature measurement. In FIG. 5, it can be seen that when the flame hits the water wall tube directly, an increase in gas temperature was observed (time a), and the water wall tube was exposed to the corrosive environment. FIG. 6 shows an example of measuring the electrical resistance of Sample 6. There is almost no change in the electric resistance while the flame is not hit directly, but when the flame comes to hit the monitoring device directly, the electric resistance gradually increases (c to d). Also, when the flame stops hitting directly, the increase in electrical resistance ceases (d).
【００２２】したがって、本実施例で火炎の直撃による
水壁管の腐食を精度よく監視することが可能となる。な
お、電気抵抗変化量から腐食速度を予測するためには、
あらかじめ実験室にて使用材料の電気抵抗変化量と断面
積変化量の関係を求めておく必要がある。また、電気抵
抗は温度変化に対して敏感であることから、装置の内部
は常に冷却し、一定温度となるようにするか、または電
気抵抗の温度依存性を実験室的に求めておいて、この結
果で温度に対する電気抵抗の変化を補正し、断面積の変
化のみを検出するようにする。Therefore, in this embodiment, it is possible to accurately monitor the corrosion of the water wall pipe due to the direct hit of the flame. In order to predict the corrosion rate from the amount of change in electrical resistance,
It is necessary to obtain beforehand the relationship between the amount of change in electrical resistance of the material used and the amount of change in cross-sectional area in the laboratory. In addition, since the electric resistance is sensitive to temperature changes, the inside of the device is always cooled so that it has a constant temperature, or the temperature dependence of the electric resistance is obtained in a laboratory. Based on this result, the change in electric resistance with respect to temperature is corrected, and only the change in cross-sectional area is detected.
【００２３】本実施例の監視装置で腐食が検知された場
合には、例えば、側壁よりのバーナに供給する２次空気
の量を増加させて、水壁管表面を還元雰囲気にしない方
法や、スートブロアを作動させ、表面に付着した付着灰
を除去するなどの方法により、腐食の増加を防止するよ
うにする。When corrosion is detected by the monitoring device of this embodiment, for example, the amount of secondary air supplied to the burner from the side wall is increased so that the surface of the water wall tube is not made into a reducing atmosphere, or The soot blower is operated and the ash deposited on the surface is removed to prevent the increase in corrosion.
【００２４】[0024]
【発明の効果】本発明によれば、ボイラの水壁管表面の
ガス温度および腐食程度を運転中に監視するようにした
ため、火炎がインピンジした際に問題となる硫化腐食の
発生の有無および発生した際の腐食速度を定量的に測定
することができる。また、本測定結果に基づき運転方法
を最適化することが可能となり、長時間安全に運転を行
うことができる。According to the present invention, since the gas temperature and the degree of corrosion on the surface of the water wall pipe of the boiler are monitored during operation, the presence or absence of the occurrence of sulfidation corrosion, which is a problem when a flame is impinged, is generated. The corrosion rate at that time can be quantitatively measured. Further, it becomes possible to optimize the driving method based on the result of this measurement, and it is possible to drive safely for a long time.
【図１】本発明の一実施例を示す火炉監視装置の説明
図。FIG. 1 is an explanatory diagram of a furnace monitoring device showing an embodiment of the present invention.
【図２】本発明の一実施例の火炉側から見た説明図。FIG. 2 is an explanatory view of the embodiment of the present invention viewed from the furnace side.
【図３】図２のIII − III線矢視方向断面図。FIG. 3 is a sectional view taken along the line III-III of FIG.
【図４】本発明実施例の実機ボイラにおける設置位置を
示した図。FIG. 4 is a diagram showing installation positions in an actual boiler according to an embodiment of the present invention.
【図５】本発明の一実施例によるガス温度測定例を示し
た図。FIG. 5 is a diagram showing an example of gas temperature measurement according to an embodiment of the present invention.
【図６】本発明の一実施例による電気抵抗測定例を示し
た図。FIG. 6 is a diagram showing an example of electrical resistance measurement according to an embodiment of the present invention.
１…水壁管、２…フィン、３…監視装置の外管、４…ガ
ス温度測定用熱電対、５…電気抵抗測定試料の温度測定
用熱電対、６…電気抵抗測定用試料、７…直流電流供給
装置、８…データロガー、９…冷却空気流量調節弁、１
０…コンピュータ、１１…冷却空気供給装置、１２…内
管、１３…電流端子、１４…電圧端子、１５…酸化物
層、１６…火炉、１７…アフターエアーポート、１８…
ダクト、１９…バーナ、２０…本発明実施例設置位置、
２１…水壁、２２…空気配管。DESCRIPTION OF SYMBOLS 1 ... Water wall pipe, 2 ... Fin, 3 ... Monitoring device outer pipe, 4 ... Gas temperature measurement thermocouple, 5 ... Electric resistance measurement sample temperature measurement thermocouple, 6 ... Electric resistance measurement sample, 7 ... DC current supply device, 8 ... Data logger, 9 ... Cooling air flow rate control valve, 1
0 ... Computer, 11 ... Cooling air supply device, 12 ... Inner tube, 13 ... Current terminal, 14 ... Voltage terminal, 15 ... Oxide layer, 16 ... Furnace, 17 ... After air port, 18 ...
Duct, 19 ... burner, 20 ... installation position of the embodiment of the present invention,
21 ... Water wall, 22 ... Air piping.
Claims (2)
壁部火炉内にさらして設けた試料を冷却手段により所定
温度に制御し、該試料近傍のガス温度を測定するととも
に、この試料に電流を流して試料両端の電圧を計測する
ことにより試料の腐食の発生または腐食量または腐食速
度を検知し、これに基づきバーナの燃焼条件の変更、ま
たはスートブロアの作動を指示するようにしたことを特
徴とするボイラ火炉内監視方法。1. A sample provided by being exposed in a boiler water wall furnace using a fuel containing a sulfur component is controlled to a predetermined temperature by a cooling means to measure a gas temperature in the vicinity of the sample, and an electric current is applied to the sample. Is generated and the voltage across the sample is measured to detect the occurrence of corrosion, the amount of corrosion, or the corrosion rate of the sample, and based on this, the combustion condition of the burner is changed, or the operation of the soot blower is instructed. Monitoring method for boiler furnace.
炉内水壁近傍のガス温度を測定する手段と、火炉内にさ
らして設けた試料と、該試料の電気抵抗の変化から腐食
の発生または腐食量もしくは腐食速度を測定する手段と
を前記ボイラの水壁部に設けたことを特徴とするボイラ
火炉内監視装置。2. A means for measuring a gas temperature near a water wall in a furnace of a boiler using a fuel containing a sulfur content, a sample exposed to the inside of the furnace, and corrosion of the sample due to a change in electric resistance of the sample. Alternatively, a means for measuring a corrosion amount or a corrosion rate is provided on a water wall portion of the boiler to monitor the inside of a boiler furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29890392A JPH06147404A (en) | 1992-11-09 | 1992-11-09 | Boiler furnace monitoring method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29890392A JPH06147404A (en) | 1992-11-09 | 1992-11-09 | Boiler furnace monitoring method and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06147404A true JPH06147404A (en) | 1994-05-27 |
Family
ID=17865663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29890392A Pending JPH06147404A (en) | 1992-11-09 | 1992-11-09 | Boiler furnace monitoring method and device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06147404A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012002551A (en) * | 2010-06-14 | 2012-01-05 | Central Res Inst Of Electric Power Ind | Method for locating corrosion part and method for diagnosing sulfidation corrosion |
| CN112326738A (en) * | 2020-11-23 | 2021-02-05 | 华能国际电力股份有限公司 | An online monitoring device for boiler flue gas side corrosion based on resistance measurement technology |
| WO2022165482A3 (en) * | 2021-01-29 | 2022-09-09 | General Electric Company | Method and system for assessing a condition of a boiler |
| WO2024111265A1 (en) * | 2022-11-22 | 2024-05-30 | 三菱重工業株式会社 | Heat recovery boiler system control device, heat recovery boiler system control method, and program |
-
1992
- 1992-11-09 JP JP29890392A patent/JPH06147404A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012002551A (en) * | 2010-06-14 | 2012-01-05 | Central Res Inst Of Electric Power Ind | Method for locating corrosion part and method for diagnosing sulfidation corrosion |
| CN112326738A (en) * | 2020-11-23 | 2021-02-05 | 华能国际电力股份有限公司 | An online monitoring device for boiler flue gas side corrosion based on resistance measurement technology |
| WO2022165482A3 (en) * | 2021-01-29 | 2022-09-09 | General Electric Company | Method and system for assessing a condition of a boiler |
| US11480332B2 (en) | 2021-01-29 | 2022-10-25 | General Electric Company | Method and system for assessing a condition of a boiler |
| WO2024111265A1 (en) * | 2022-11-22 | 2024-05-30 | 三菱重工業株式会社 | Heat recovery boiler system control device, heat recovery boiler system control method, and program |
| JP2024075284A (en) * | 2022-11-22 | 2024-06-03 | 三菱重工業株式会社 | Heat recovery boiler system control device, heat recovery boiler system control method, and program |
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