WO2018070681A1 - Method for manufacturing briquette and apparatus for manufacturing briquette - Google Patents

Abstract

The present invention relates to a method for manufacturing a briquette, which is to be charged in a dome part of a melting gasification furnace and to be rapidly heated in an apparatus for manufacturing molten iron, the apparatus comprising: a melting gasification furnace in which reduced iron is charged; and a reduction furnace connected to the melting gasification furnace and providing reduced iron. According to one embodiment of the present invention, the method for manufacturing a briquette comprises the steps of: providing pulverized coal; manufacturing mixed coal by mixing an acid-treated starch powder with the pulverized coal; heat-treating the mixed coal; and manufacturing a briquette by molding the heat-treated mixed coal.

Description

 【Specification】

 [Name of invention]

 Method for producing coal briquettes and apparatus for producing coal briquettes

 Technical Field

 The present invention relates to coal briquettes and a method of manufacturing the same. More specifically, the present invention relates to coal briquettes to which bioplastics are applied and a method of manufacturing the same.

 [Technique to become background of invention]

 In the molten iron reduction method, iron ore is used as a reducing furnace and a molten gasifier for melting the reduced iron ore. When iron ore is melted in a melt gasifier, coal briquettes are charged into the melt gasifier as a heat source for melting iron ore. Here, the reduced iron is melted in the molten gasifier, converted to molten iron and slag and then discharged to the outside. The coal briquettes charged into the melt gasifier form a coal seam layer. Oxygen is blown through the tuyere provided in the melt gasifier, and then burns the coal seam layer to generate combustion gas. The combustion gas is converted into a high temperature reducing gas while rising through the coal seam bed. The high temperature reducing gas is discharged to the outside of the melt gasification furnace and supplied to the reduction furnace as reducing gas.

 Coal briquettes are made by mixing coal and a binder. In this case, molasses is used as the binder. The components of the molasses vary depending on the region of production, and it is difficult to control the components according to the sugar production process. Therefore, when the coal briquettes are manufactured using molasses as a binder, the quality of the coal briquettes cannot be constantly controlled. In particular, when molasses having high moisture is used, the quality of coal briquettes is deteriorated.

 [Content of invention]

 Problem to be solved

 The present invention provides a coal briquette to which bioplastics are applied and a method of manufacturing the same.

 [Measures of problem]

A molten gasifier in which reduced iron is charged and a molten gasifier connected to a molten gasifier, and a method for producing coal briquettes which are charged into a dome of a molten gasifier and rapidly heated in a molten iron manufacturing apparatus including a reducing furnace for providing reduced iron. Method for producing coal briquettes according to an embodiment of the step of providing pulverized coal; Mixing starch powder acid-treated with pulverized coal to prepare a blended coal; Heat treating the blended coal; And forming the coal briquettes by molding the heat-treated blended coal.

 In the step of preparing the coal blend, the acid treated starch powder is a step of pulverizing the biomass, immersing the pulverized biomass in an aqueous acid solution to separate the filtrate containing starch, the separated filtrate to pH 3 to 5.5 Washing and drying the washed filtrate. In the step of preparing the coal blend, the acid treated starch powder may have a pH of 3 to 5.5 when dissolved in water at a concentration of 30% by volume.

In the step of preparing the blended coal, the acid treated starch powder may have an average particle size of 0.01 to 1 country.

 In the step of preparing the blended coal, 1 to 10 parts by weight of the acidified starch powder may be added to 100 parts by weight of pulverized coal.

Preparing the blended coal may be carried out at a temperature of 50 to 65 ^° C. In the step of heat treatment, the acid treated starch powder in the coal briquettes may be transformed into bioplastics by heat treatment.

 The heat treatment step may include supplying steam to the coal blend.

 The water in the steam may be supplied to 1 to 5 parts by weight based on 100 parts by weight of pulverized coal.

The temperature of the steam may be 120 to 300 ^° C.

The temperature of the coal blend in the heat treatment step may be 60 to 200 ^° C.

 After the heat treatment, the method may further include drying the heat-treated coal blend.

 The coal briquettes prepared may contain 1 to 10% by weight of bioplastics, 3 to 15% by weight of moisture and remainder coal, and the bioplastics may be comprised of 25 to 70% by weight of amylopectin and 30 to 75% by weight of amylose.

The apparatus for producing coal briquettes according to an embodiment of the present invention is charged into a dome portion of a molten gasifier in a molten gas manufacturing apparatus including a molten gasifier in which reduced iron is charged, and a reducing furnace connected to the molten gasifier and providing reduced iron. rapidity An apparatus for producing coal briquettes to be heated, comprising: pulverized coal supply bins; Acid treated starch powder feed bin; A mixer for receiving pulverized coal and acid treated starch powder from the pulverized coal feed bin and the acid treated starch powder feed bin and mixing them to produce a blended coal; A kneader for receiving heat from the blended coal from a mixer; And a molding machine which receives the mixed coal heat-treated from the kneader and performs molding.

Between the mixer and the kneader, it may further include a preheating mixer to mix while preheating the coal mixture ^at a temperature of 50 to 65 ^° C.

 The kneader is connected to a steam supply pipe, and receives steam from the steam supply pipe to heat-treat the coal briquettes.

 Between the kneader and the molding machine may further include a dryer for drying the heat-treated coal coal.

 【Effects of the Invention】

 Coal briquettes having excellent strength can be produced.

Since there is no K component in the binder, clogging of the pipe does not occur. The absence of quicklime or slaked lime reduces the C0 ₂ reaction and improves the fuel efficiency of coal.

 By minimizing the binder compounding ratio, the economy is improved compared to the existing binder. [Brief Description of Drawings]

 1 is a schematic flowchart of a method of manufacturing coal briquettes according to an exemplary embodiment of the present invention.

 2 is a view schematically showing an apparatus for manufacturing coal briquettes according to an embodiment of the present invention.

 3 is a schematic diagram of an apparatus for manufacturing molten iron using the coal briquettes manufactured in FIG. 1.

 4 is a schematic diagram of another apparatus for manufacturing molten iron using the coal briquettes manufactured in FIG. 1.

 5 is a result of ultraviolet spectrometer (UV spectrometer) of the remaining binder material after the coal was separated from the coal briquettes prepared in Examples and Comparative Examples.

 [Specific contents to carry out invention]

The terms first, second, and crab 3 are used to describe various parts, components, regions, and layers. And / or sections, but are not limited to these. These terms are only used to distinguish one part, component, region, layer or section from another part, component, region, layer or section. Accordingly, the first portion, component, region, layer or section described below may be referred to as the second portion, component, region, layer or section without departing from the scope of the invention.

 The terminology used herein is for reference only to specific embodiments and is not intended to limit the invention. As used herein, the singular forms “a,” “an,” and “the” include plural forms as well, unless the phrases clearly indicate the opposite. As used herein, the meaning of "comprising" embodies a particular characteristic, region, integer, step, operation, element and / or component, and the presence of another characteristic, region, integer, step, operation, element and / or component or It does not exclude the addition.

 Although not defined otherwise, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. Commonly defined terms used are additionally interpreted to have a meaning consistent with the related technical literature and the presently disclosed contents, and are not interpreted in an ideal or very formal sense unless defined.

 Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

 1 schematically shows a flowchart of a method of manufacturing coal briquettes according to the present invention and an embodiment. The flowchart of the manufacturing method of the coal briquettes of FIG. 1 is for illustration only, and this invention is not limited to this. Therefore, the manufacturing method of the coal briquettes can be variously modified.

As shown in Figure 1, the method for producing coal briquettes includes the steps of providing pulverized coal (S10), mixing starch powder acid-treated with pulverized coal to prepare coal briquettes (S20), and heat treating the coal briquettes (S30). ) And forming the coal briquettes by molding the heat-treated mixed coal (S40). In addition, as required The manufacturing method may further comprise other steps.

 First, in step S10, pulverized coal is provided. Here, pulverized coal is crushed coal, and in general, coal has a weak carbon content depending on the degree of carbonization.

60% peat, about 7OT peat and lignite, about 70% to 80% subbituminous coal, about 80% to 90% bituminous coal, and more than anthracite coal. The kind of coal used here is not specifically limited, A single coal type or various types of coal can be mixed and used. In order to reduce the quality variation, it is preferable that the particle size of pulverized coal is constant. As a specific standard, the particle size of 3mm or less is 80wt or more and the particle size is 5 隱. Pulverized coal having a particle size distribution of 90 wt% or less can be used.

 Next, the mixed coal is prepared by mixing the starch powder treated with fine coal in the step (S20). According to an embodiment of the present invention, instead of directly mixing the manufactured bioplastics with pulverized coal and applying them as a binder of coal briquettes, an acid-treated starch powder that is a raw material of bioplastics is blended and described later (S30). By synthesizing bioplastics in the back, it serves as a coal briquette binder. When the bioplastics are already mixed with pulverized coal, it is not smooth to apply them to the surface of the pulverized coal, and the process of remelting the bioplastic at high temperature is required. At this time, the re-melted bioplastics have low elastic recovery force and thus have low instantaneous strength of the coal briquettes manufactured. On the other hand, in one embodiment of the present invention to prepare a blended coal containing the acid-treated starch powder as a raw material, by synthesizing the bio-plastic in the step (S30) and the like to be described later, smoothly applied to the surface of the pulverized coal, It is possible to improve the strength immediately of the produced coal briquettes.

Starch is 20 to 30% by weight amylose and 70 to 80% by weight amylo pectin? It consists of ¾. Amylose has a linear Helix (ix) structure and is elastic and can be applied to the medium effectively. It is also very effective as a binder because it is applied at a high density. Amylo pectin, however, has a branched structure that is hard to apply to the material to be bound. In addition, since the branch structure has a lower density than the linear structure, the strength of the binder portion after binding is weak, so that the branch structure is susceptible to deformation due to external pressure. Viscoelastic ability is weak. In one embodiment of the present invention, starch is synthesized into bioplastics in step S30 and the like, and the beneficial amylose structure is increased as a binder, and the amylopectin structure is reduced, thereby improving the cold.strength and hot strength of the coal briquettes.

 In one embodiment of the present invention, the acid-treated powdered starch is a step of pulverizing the biomass, immersing the pulverized biomass in an aqueous acid solution to separate the filtrate containing starch, washing the separated filtrate to pH 3 to 5.5 And drying the washed filtrate. At this time, the biomass may include one or more selected from the group consisting of cassava, corn, wheat, rice, barley and potatoes. Specifically, corn may be used.

If corn is used, it is immersed using 0.2-0.5% by volume sulfurous acid solution. When soaked, it swells slowly as it is absorbed and becomes saturated when the water reaches 40% by weight. As it becomes saturated, the soluble substance in the raw material begins to elute in the immersion liquid, and the lactic acid bacteria develop and the eluted sugar is fermented into lactic acid. Fermented lactic acid and sulfurous acid decompose the protein, which leads to softening of the starch and protein bonds, thereby facilitating the separation of starch. Corn immersed in the sulfurous acid solution is crushed using a crusher. Sending to the crushed article ssinun separation ^"is separation of starch. At this time, a rotary filter using a centrifuge can be used, and the separated starch filtrate is sent to the next step. At this time, the filtrate is washed to pH 3 to 5.5. And the drying is to include less than 15% by weight of moisture. This will result in the presence of sulfuric acid and lactic acid in some corn starch powder. Sulfuric acid may contain 0.01% by weight or more, and lactic acid may contain 0.01% by weight or more. That is, the acid treated starch powder may contain 0.01 to 1% by weight of sulfuric acid and 0.01 to 1% by weight of lactic acid.

In general, when preparing starch, at least 100% by weight of the acid component in the aqueous acid solution is used as the extractant in the step of extracting acid from starch. Since one embodiment of the present invention uses acid treated starch instead of starch, it is sufficient to use 40-60 wt% of the acid component in the aqueous acid solution. In one embodiment of the present invention the process for preparing acid-treated starch is general Compared to the process for preparing starch, rather simple, there is an advantage in the manufacturing process.

 Acid treated starch powder should have a pH of 3 to 5.5 when dissolved in water at a concentration of 30% by volume. If the pH is too high, problems may arise in which it is difficult to adequately obtain the viscoelasticity of the bioplastics. If the pH of the binder compound is too low, the viscoelasticity of the bioplastics may be lowered and the equipment may be corroded. Therefore, pH can be adjusted in the above-described range. More specifically, the acid treated starch powder may have a pH of 4-5 when dissolved in water at a concentration of 30% by volume.

 The acid treated starch powder may have an average particle size of 0.01 to 1 mm 3. If the average particle size of the acid-treated starch powder is too small, the acid-treated starch powder may be agglomerated, and may not be smoothly mixed with the pulverized coal. If the average particle size of the acid treated starch powder is too large, the mixing with the pulverized coal may not be smooth. Therefore, the average particle size of the starch powder acid-treated in the above-described range can be adjusted.

The addition amount of the acid-treated starch powder may add 1 to 10 parts by weight of the acid-treated starch powder with respect to 100 parts by weight of pulverized coal. If the amount of acid treated starch powder is added too much, it may be difficult to uniformly mix the acid treated starch powder with the pulverized coal. If too little acid treated starch powder is added, the binding effect may be negligible. Therefore, the addition amount of the acid-treated starch powder can be adjusted to the above-mentioned range. More specifically, 2 to 8 parts by weight of the acidified starch powder may be added to 100 parts by weight of pulverized coal. Step (S20) may be carried out at a temperature of 50 to 65 ^° C. If the temperature is too low, it may take a long time to increase the temperature to the appropriate heat treatment temperature in step (S30) to be described later. If the temperature is too high, the acid-treated starch powder that is not closely mixed with pulverized coal may be transformed into bioplastic in step S30 to be described later.

1 again, in step S30, the coal briquettes are heat-treated. In step S30, the acid treated starch powder in the coal briquettes is transformed into bioplastics by heat treatment. Describe the mechanism by which acid-treated starch powder is transformed into bioplastics.

 Amylose and amylo pectin present in starch have a crystalline structure. Amylose is linear and amylopectin is a structure with branches in the amylose structure. If you add heat and add water, the water will penetrate inside the crystal. At room temperature, water is difficult to penetrate between crystals. The water penetrated between the crystals combines amylose and amylo pectin with hydrogen bonding. Amylo pectin is branched by acid to form amylose. When water penetrates into amylose crystals, hydrogen bonding occurs, and hydrophilic group hydrophilic group interaction causes hydrophilic group 0H to go out and hydrophobic group OC bond to inward, transforming to Helix structure. In addition, it combines with the polar lipids present in the starch to form a double helix structure around the polar lipids. Helix, which is not combined with polar fat, forms a double helix structure between the helix. In the case of amylose, it is shared as a double helix, and water is discharged outwards to form a crystal structure.

 The mechanism by which amylo pectin is converted to amylose is as follows. Amylose is composed of glucose (alpha 1, 4-bonding). Amylo pectin is composed of 1, 4-bonding of main backbone, and its branched part is connected to skeletal structure through alpha 1, 6-bonding.

At pH 3 to 5.5 and at temperatures above 60 ^° C, alpha 1, 4-bonding is not incision while a-1, 6-bonding is incision. Therefore, a -1 and 6-bonding incisions can be selectively made in the presence of acid. Therefore, it is possible to cut the branch of amylo pectin and make it linear similar to amylose. Through this process it is possible to synthesize a bioplastic consisting of 25 to 70% by weight of amylopectin and 30 to 75% by weight of amylose. More specifically, the bioplastic consists of 25 to 35% by weight of amylopectin and 65 to 75% by weight of amylose. Bioplastics have a relatively high density, which increases the strength of coal briquettes, and linear molecules form a helix structure. Effective adhesion to the pulverized coal surface is possible.

The step of heat treatment in step (S30) may include supplying steam to the coal blend. By supplying steam, it is possible to supply the moisture and heat required for bioplastic synthesis. In one embodiment of the present invention, since the acid required for bioplastic synthesis is supplied in the form of an acid-treated powder rather than an aqueous solution, a large amount of moisture is not unnecessarily supplied. As a result, the moisture content in the coal briquettes is reduced, thereby improving the strength of the coal briquettes and reducing unnecessary drying steps. Specifically, the water in the steam may be supplied to 1 to 5 parts by weight based on 100 parts by weight of pulverized coal. If too little water is supplied, bioplastic synthesis may not be performed smoothly. If too much water is supplied, the cold strength of the final coal briquettes produced may be adversely affected. Therefore, it is possible to adjust the amount of steam to supply moisture in the above-described range. At this time, the temperature of the steam may be 120 to 300 ^° C.

Due to the heat treatment in step (S30), the temperature of the coal blend is raised to 60 to 200 ^° C. When the temperature of the coal blend does not rise properly, the synthesis of bioplastics may not be performed smoothly.

After step S30, the method may further include drying the heat-treated coal blend. Specifically, the coal briquettes may be dried for 3 to 10 minutes at a temperature of 50 to 200 ^° C. By further comprising the step of drying, the water present in the coal briquettes can be adjusted to include 3 to 15% by weight of water relative to 100% by weight of coal briquettes. More specifically, it can be adjusted to include 5 to 9% by weight. It is possible to improve the strength of coal briquettes in the aforementioned range. Such moisture may be derived from moisture present in the pulverized coal in step S10, moisture present in the starch powder acid treated in step S20 and moisture present in steam in step S30.

Returning to FIG. 1 again, in step S40, the coal briquettes are heat-treated to form coal briquettes. Although not shown in FIG. 1, coal briquettes may be manufactured in the form of pockets or strips by charging coal briquettes between pairs rotating in opposite directions. As a result, coal briquettes having excellent hot strength and cold strength can be produced. Coal briquettes produced by the above manufacturing method comprises 1 to 10% by weight of bioplastics, 3 to 15% by weight of water and the balance of coal, and bioplastics include 25 to 70% by weight of amylopectin and 30 to 75% by weight of amylose. Is done. More specifically, the coal briquettes may include 3 to 7 wt% of bioplastics, 5 to 9 wt% of moisture, and balance coal. Coal briquettes according to an embodiment of the present invention have excellent strength due to the viscoelasticity of bioplastics.

 FIG. 2 schematically shows a coal briquette manufacturing apparatus to which the method of manufacturing coal briquettes illustrated in FIG. 1 is applied. The structure of the coal briquette manufacturing apparatus of FIG. 2 is merely for illustrating the present invention, and the present invention is not limited thereto. Therefore, the coal briquette manufacturing apparatus of FIG. 2 may be modified in various forms.

 The coal briquette manufacturing apparatus 100 according to an embodiment of the present invention includes a pulverized coal supply bin 10, an acid treated starch powder supply bin 20, a pulverized coal supply bin 10, and an acid treated starch powder supply bin 20. Powdered coal and acid-treated starch powders supplied from the mixture and mixed to produce blended coal; A kneader 50 which receives a blended coal from a mixer and heat-treats it; And a molding machine 70 which receives the mixed coal heat-treated from the kneader 50 and shapes the same.

 The coal briquette manufacturing apparatus 100 according to an embodiment of the present invention supplies the pulverized coal supply bin 10 and the acid treated starch powder supply bin 20, and the bins 1 and 20 supply the pulverized coal and the acid treated starch powder. . Pulverized coal and acid treated starch powder have been described above, and thus redundant description will be omitted.

 Pulverized coal and acid treated starch powder are supplied to the mixer 30. The mixer 30 receives pulverized coal and acid treated starch powder from the pulverized coal supply bin 10 and the acid treated starch powder supply bin 20, and mixes them to produce a coal blend.

The mixer 30 is connected to the preheat mixer 40, and can be mixed while preheating the coal briquettes at a temperature of 50 to 65 ^° C. The presence of the preheat mixer 40 allows the heat treatment of the coal briquettes to be rapidly performed in the kneader 50 to be described later. The preheat mixer 40 may supply steam for heat treatment.

The kneader 50 receives heat-mixed coal from the mixer 30 or the preheating mixer 40. Acid treated starch powder due to heat treatment in kneader 50 Transformed into plastic. Since the bioplastics have been described above, overlapping descriptions will be omitted.

 The kneader 50 is connected to a steam supply pipe 51, and receives steam from the steam supply pipe 51 to heat-treat the coal blend. The steam supply pipe 51 may be provided in plural along the vertical direction of the kneader 50. The plurality of installed steam supply pipes 51 may supply steam at different temperatures or different amounts of steam depending on the installation position. For example, it may be configured to supply a high temperature of the steam toward the bottom along the vertical direction, or may be configured to supply a large amount of steam toward the bottom. In one embodiment of the present invention, since the acid is supplied in the form of acid-treated starch powder rather than in the form of an acid aqueous solution, unnecessary moisture in the coal blend is reduced, and energy for heat treatment in the kneader 50 is reduced. For example, when the acid is supplied in the form of an aqueous acid solution, the content of water in the acid aqueous solution increases, so that an additional energy supply for converting the water in the aqueous acid solution into the vapor form in the kneader is required. In addition, the temperature rise for heat treatment in the kneader 50 is not made quickly. As a result, the incision reaction for bioplastic transformation does not occur effectively. On the other hand, in the case of one embodiment of the present invention, since the moisture content in the coal blend is minimized, the energy for heat treatment is reduced in the kneader 50, the temperature rise for the heat treatment is made quickly, the incision reaction for bioplastic deformation It occurs effectively, and consequently, the compressive strength and drop strength of the coal briquettes are improved.

The rear end of the kneader 50 may be connected to a dryer 60 for drying the heat-treated coal coal. Dryer 60 may dry the heat treated coal blend ^at a temperature of 50 to 200 ^° C for 3 to 10 minutes. The dryer 60 may inject hot air above 70 ^° C. and install a vent so that all the moisture evaporates immediately. ^β

The molding machine 70 receives the blended coal heat-treated from the kneader 50 and shapes it. The molding machine 70 may charge the coal briquettes between the twin rolls rotating in opposite directions to form the coal briquettes in the form of pockets or strips. Molding machine 70 can be operated above -5 ^° C. More specifically, at room temperature Can work.

Figure 3 uses the coal briquettes prepared in Figure 1 _; The molten iron manufacturing apparatus 200 is shown schematically. The structure of the apparatus for manufacturing molten iron 200 of FIG. 3 is merely for illustrating the present invention, and the present invention is not limited thereto. Therefore, the apparatus for manufacturing molten iron 200 of FIG. 3 may be modified in various forms.

 The molten iron manufacturing apparatus 200 of FIG. 3 includes a melt gasifier 110 and a reduction furnace 120. In addition, other devices may be included as needed. Iron ore is charged into the reduction furnace 120 to be reduced. Iron ore charged in the reduction furnace 120 is made of reduced iron while passing through the reduction furnace 120 after being pre-dried. Reduction furnace 120 is a layered layer type reduction furnace, receives a reducing gas from the melt gasifier 110 to form a layered layer therein.

 Since the coal briquettes manufactured by the manufacturing method of FIG. 1 are charged into the molten gasifier 110, a coal seam layer is formed inside the molten gasifier 110. The dome part 101 is formed in the upper part of the melt gasifier 110. That is, a wider space is formed than the other parts of the melt gasification furnace 110, where there is a high temperature reducing gas. Therefore, coal briquettes charged into the dome portion 101 by the reducing silver gas can be easily differentiated. However, since the coal briquettes manufactured by the method of FIG. 1 use bioplastic as a binder, the coal briquettes have high hot strength, do not differentiate in the dome portion of the melt gasifier 110, and fall to the lower portion of the melt gasifier 110. The heat generated by the pyrolysis reaction of the coal briquettes moves to the lower part of the melt gasification furnace 110 to react with the exothermic reaction with oxygen supplied through the tuyere 130. As a result, the coal briquettes can be used as a heat source for keeping the melt gasifier 110 at a high temperature. On the other hand, because it provides air permeability, a large amount of gas generated in the lower portion of the melt gasifier 110 and the reduced iron supplied from the reducing furnace 120 can pass through the coal seam layer in the melt gasifier 110 more easily and uniformly. have.

In addition to the coal briquettes described above, a bulk coal material or coke may be charged into the melt gasifier 110 as necessary. An air vent 130 is installed on the outer wall of the melt gasifier 110 to blow oxygen. Oxygen is blown into the coal packed bed to form a combustion zone. The coal briquettes are burned in the combustion zone to generate reducing gas. Can be.

 4 schematically shows an apparatus for manufacturing molten iron 300 using the coal briquettes manufactured in FIG. 1. The structure of the apparatus for manufacturing molten iron 300 of FIG. 4 is merely for illustrating the present invention, and the present invention is not limited thereto. Therefore, the apparatus for manufacturing molten iron 300 of FIG. 4 may be modified in various shapes. Since the structure of the apparatus for manufacturing molten iron 300 of FIG. 3 is similar to that of the apparatus for manufacturing molten iron 200 of FIG. 3, the same reference numerals are used for the same parts, and a detailed description thereof will be omitted.

 As shown in FIG. 4, the molten iron manufacturing apparatus 300 includes a molten gasifier 110, a reducing furnace 122, a reduced iron compression device 140, and a reduced reduced iron storage tank 150. (150) may be omitted.

 The produced coal briquettes are charged into a melt gasifier 110. Here, the coal briquettes generate a reducing gas in the melt gasifier 110 and the generated reducing gas is supplied to a fluidized bed reducing furnace. The iron ore is supplied to the plurality of reducing furnaces 122 having a fluidized bed, and is made of reduced iron while flowing by the reducing gas supplied from the melt gasifier 110 to the reducing furnaces 122. The reduced iron is compressed by the reduced iron compression device 140 and then stored in the reduced reduced iron storage tank 150. The compressed reduced iron is supplied from the compressed reduced iron storage tank 150 to the melt gasifier 110 and melted in the melt gasifier 110. Since the coal briquettes are supplied to the melt gasifier 110 and changed into air permeable, a large amount of gas and compressed reduced iron generated in the lower portion of the melt gasifier 110 make the coal seam layer in the melt gasifier 110 more easily and uniformly. Through this, good molten iron can be produced.

 Hereinafter, the present invention will be described in more detail through experimental examples. These experimental examples are only for illustrating the present invention, and the present invention is not limited thereto.

 Example

 Experimental Example 1

 100 parts by weight of coal having an average property and having a particle size of 90% or more of 3 kPa or less was prepared from pulverized coal (water content of 10wt% or less).

Starch is prepared from corn flour, which is acid-treated in the manufacturing process. The coal briquettes were prepared by mixing 4 parts by weight of starch powder (pH 4 when dissolved in water with 30 vol ¾>). The coal blend was transferred to a preheat mixer, and the steam was blown into the preheat mixer to preheat and mix to 50 ^° C. or higher. This was added to the kneader again to adjust the temperature inside the kneader to 90 ^° C or more. At this time, the amount of water supplied in the steam was 2 parts by weight, and the kneader residence time was 15 minutes. The mixed coal discharged from the kneader was kept in the dryer Gravi ty Feeder for 3 to 5 minutes, blown with hot air at 120 ^° C, and proceeded with Suct ion.

 The coal briquettes were compressed into a press to produce briquette-shaped briquettes having a size of 64.5 mm × 25.4 mm × 19.1 mm. The compressive strength and the drop strength of the coal briquettes were measured by the following evaluation method and summarized in Table 1 below.

 Experimental Example 2

 It was prepared in the same manner as in Experiment 1 except that the supply amount of water in the steam was adjusted to 3 parts by weight.

 Experimental Example 3

 It was prepared in the same manner as in Experiment 1 except that the supply amount of water in the steam was adjusted to 3.5 parts by weight.

 Experimental Example 4

 The amount of water supplied in the steam was prepared in the same manner as in Experiment 1 except that it was adjusted to 4 parts by weight.

 Experimental Example 5

 Kneader residence time was adjusted to 5 minutes, and was prepared in the same manner as in Experiment 1 except that the amount of water supply in the steam was adjusted to 3 parts by weight.

 Experimental Example 6

 Kneader residence time was adjusted to 10 minutes, and was prepared in the same manner as in Experiment 1 except that the amount of water supply in the steam was adjusted to 3 parts by weight.

 Experimental Example 7

Kneader residence time was adjusted to 20 minutes, and was prepared in the same manner as in Experiment 1 except that the amount of water supply in the steam was adjusted to 3 parts by weight. Comparative example

 100 parts by weight of coal having an average property and having a particle size of 3 kPa or less was prepared from pulverized coal.

 The coal briquettes were prepared by adding 5 parts by weight of 5% by weight aqueous acetic acid solution and 4 parts by weight of starch to the fine coal. The prepared coal briquettes were put into a kneader and heat-treated, and compressed into a press to prepare briquette-shaped coal briquettes having a size of 64.5 mm X 25.4 mm X 19. 1 mm. The compressive strength and the drop strength of the coal briquettes were measured by the following evaluation method and summarized in Table 1 below.

 Binder Ingredient Identification Experiment

 10 g of coal briquettes are removed and crushed. Then, settle in ethanol for more than one day and filter. The resulting solution is concentrated using a rotary evaporator. Then dilute in 10 mL of water. Then drop 1 to 2 drops of iodine solution. A UV spectrometer is used to measure the rate of change in absorption intensity of amylose and amylo pectin. Amylose is 620 nm and amylo pectin is at 540 nm. In Figure 5, Experimental Example 1 (X mark), Experimental Example 2 (mark 0) and Experimental Example 3 ((mark), if amylose / amylo pectin is commonly used, the higher amylose comes out closer to the amylose absorption curve and the bio within the coal briquettes It can be confirmed that the plastic is formed. On the other hand, in the case of the comparative example (Δ mark), the bioplastics do not form and come close to the absorption curve of amylo pectin, and it can be confirmed that the starch remains.

 Compressive strength test

 Thirty pieces of coal briquettes manufactured in Experimental Examples 1 to 7 and Comparative Examples were fixed to the lower part, and the average load was measured by measuring the maximum load until breaking at a constant speed from the upper part.

 Drop strength test

 The weight ratio of the coal briquettes prepared in Experimental Examples 1 to 7 and the comparative example was dropped four times at a height of 5 m from the ground to maintain a shape with a particle size of 10 mm 3 or more as a percentage of the weight of the whole coal briquettes.

Experiment result The experimental results of the coal briquettes prepared in Experimental Examples 1 to 7 and Comparative Examples described above are summarized in Table 1 below.

 Table 1

표 1에서 나타나는 것과 같이， 실험예 1 내지 7에서 제조한 성형탄의 강도가수전분을사용한 비교예에 비해 우수함을 확인할수 있었다.

As shown in Table 1, it was confirmed that the strength of the coal briquettes prepared in Experimental Examples 1 to 7 is superior to the comparative example using the water starch.

 The present invention is not limited to the above embodiments, but may be manufactured in various forms, and a person of ordinary skill in the art to which the present invention pertains does not change the technical spirit or essential features of the present invention. It will be appreciated that the present invention may be practiced as. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

 [Explanation of code]

 10. Pulverized coal supply bin

 20. Acid Treated Starch Powder Supply Bin

 30. Mixer

40. Preheat Mixer 50. Kneader

60. Dryer

70. Molding Machine

 100. Coal briquette manufacturing apparatus 110. Melt gasification furnace 120, 122. Reduction furnace

 130. Fenggu

 140. Reduced iron compression device 150. Compressed reduced iron storage tank 200, 300.

101.

Claims

[Claim]  [Claim 1]  A molten gas furnace in which reduced iron is charged, and  A method of manufacturing coal briquettes connected to the molten gasifier and charged in a dome portion of the molten gasifier in a molten iron manufacturing apparatus including a reducing furnace providing the reduced iron, wherein the coal briquettes are rapidly heated.  Providing pulverized coal;  Preparing a coal briquette by mixing the starch powder acid-treated with the pulverized coal;  Heat treating the blended coal; And  Forming a coal briquette by molding the heat-treated coal;  Method for producing coal briquettes comprising a.  [Claim 2]  The method of claim 1,  In the step of preparing the blended coal, the acid treated starch powder is a step of pulverizing the biomass, immersing the pulverized biomass in an aqueous acid solution to separate the filtrate containing starch, the separated filtrate is pH 3 to 5.5 Method of producing coal briquettes, comprising the step of washing with a step of drying the washed filtrate.  [Claim 3]  The method of claim 1,  In the step of preparing the blended coal, the acid-treated starch powder is dissolved in water at a concentration of 30% by volume of the method for producing coal briquettes having a pH of 3 to 5.5 [Claim 4]  The method of claim 1  In the step of preparing the blended coal, the acid-treated starch powder has a mean particle size of 0.01 to 1mm manufacturing method of coal briquettes.  [Claim 5]  In that U term, In the step of preparing the blended coal, based on 100 parts by weight of the pulverized coal Method for producing coal briquettes is added 1 to 10 parts by weight of the acid-treated starch powder. [Claim 6]  The method of claim 1, The step of preparing the blended coal is a method for producing coal briquettes carried out at a temperature of 50 to 65 ^° C.  [Claim 7]  The method of claim 1,  In the step of heat treatment, the method for producing coal briquettes wherein the acid-treated starch powder in the blended coal is transformed into bioplastics by the heat treatment [Claim 8]  The method of claim 1,  Wherein the heat treatment step of producing coal briquettes comprising the step of supplying steam to the blended coal.  [Claim 9]  The method of claim 8,  Method for producing coal briquettes so that the water in the steam is supplied 1 to 5 parts by weight based on 100 parts by weight of the pulverized coal.  [Claim 10]  The method of claim 8, The temperature of the steam is 120 to 300 ^° C. Method of producing coal briquettes.  [Claim 11]  In that U term,  The degree of silver of the coal blend in the heat treatment step is 60 to 20CTC manufacturing method of coal briquettes.  [Claim 12]  The method of claim 1,  After the heat treatment step, further comprising the step of drying the heat-treated coal coal.  [Claim 13] The method of claim 1, The coal briquettes prepared include 1 to 10% by weight of bioplastics, 3 to 15% by weight of moisture and remainder coal, wherein the bioplastics are made of coal briquettes consisting of 25 to 70% by weight of amylopectin and 30 to 75% by weight of amylose. Way.  [Claim 14]  A molten gas furnace in which reduced iron is charged, and  An apparatus for producing coal briquettes, which is connected to the molten gasifier and is charged into a dome of the molten gasifier in a molten iron manufacturing apparatus including a reducing furnace for providing the reduced iron, and rapidly heated.  Pulverized coal supply bin;  Acid treated starch powder feed bin;  A mixer configured to receive the pulverized coal and the acid treated starch powder from the pulverized coal supply bin and the acid treated starch powder supply bin, and to mix them to produce mixed coal; A kneader for receiving heat from the mixer and heat-treating coal; And  A molding machine which receives the compounded tanol that is heat-treated from the kneader and is molded;  Apparatus for producing coal briquettes comprising a.  [Claim 15]  The method of claim 14, Between the mixer and the kneader, the apparatus for producing coal briquettes further comprises a preheating mixer to mix while preheating the coal mixture ^at a temperature of 50 to 65 ^° C. [Claim 16]  The method of claim 14,  The kneader is connected to the steam supply pipe is supplied with steam from the steam supply pipe for producing coal briquettes heat treatment coal mixture coal. [Claim 17]  The method of claim 14,  Apparatus for producing coal briquettes further comprising a dryer for drying the heat-treated blended coal between the kneader and the molding machine.