WO2017052042A1

WO2017052042A1 - Molded coal, manufacturing method and manufacturing apparatus therefor, and molten iron manufacturing method

Info

Publication number: WO2017052042A1
Application number: PCT/KR2016/007135
Authority: WO
Inventors: 박우일; 김상현; 김홍산; 김현정; 최무업
Original assignee: 주식회사 포스코
Priority date: 2015-09-25
Filing date: 2016-07-01
Publication date: 2017-03-30
Also published as: BR112018005949A2; WO2017052042A8; CN108138064A; EP3354712A4; EP3354712B1; KR101696628B1; EP3354712A1

Abstract

Molded coal, a manufacturing method therefor, and a molten iron manufacturing method are provided. The molded coal is charged in the dome part of a melting gasification furnace, in an apparatus for manufacturing molten iron, and is rapidly heated, wherein the apparatus for manufacturing molten iron comprises: i) the melting gasification furnace in which reduced iron is to be charged; and ii) a reduction furnace connected to the melting gasification furnace and providing reduced iron. The molded coal manufacturing method comprises: i) a step of providing fine coal; ii) a step of providing a mixture by mixing the fine coal and a binder; iii) a step of providing molded coal by molding the mixture; and iv) a heat treatment step of increasing compressive strength by heating the molded coal.

Description

【Specification】

[Name of invention]

Coal briquettes, a method of manufacturing the same, a manufacturing apparatus, and a method

Technical Field

The present invention relates to coal briquettes, a method for producing the same, a manufacturing apparatus, and a method for producing molten iron. More specifically, the present invention relates to a coal briquettes, a method for manufacturing the same, a manufacturing apparatus, and a method for manufacturing molten iron, which are capable of securing compressive strength even for coal briquettes having a high moisture content.

[Technique to become background of invention]

In the molten iron reduction method, a reduction furnace for reducing iron ore and a melt gasification furnace for melting reduced iron ore are used. 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. 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 installed in the melt gasifier and then burns the coal packed bed to produce combustion gas. Combustion gas is converted into hot reducing gas while rising through the coal-filled 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 prepared by mixing pulverized coal and a binder. In order to use molten iron, it is necessary to manufacture coal briquettes having excellent cold strength and hot strength. Therefore, coal briquettes are manufactured using a binder having excellent viscosity such as molasses.

[Content of invention]

Problem to be solved

It is intended to provide coal briquettes having excellent hot strength and cold strength by heat-treating the coal briquettes prepared by mixing water with a binder or a binder having a high moisture content to increase compressive strength. The present invention also provides a method and a manufacturing apparatus for the coal briquettes described above. And to provide a molten iron manufacturing method including the above-described method for producing coal briquettes.

[Measures of problem] Coal briquettes according to an embodiment of the present invention is charged into the dome portion of the molten gasifier in the molten gasifier in the molten iron manufacturing apparatus including i) a molten gasifier is charged with reduced iron, and ii) a molten gasifier, and a reducing furnace providing reduced iron. It is heated rapidly.

Method for producing coal briquettes according to an embodiment of the present invention, i) providing a fine coal, ii) mixing a binder in the fine coal to provide a mixture, iii) forming a mixture to provide coal briquettes, And iv) heating the coal briquettes to increase compressive strength.

The method for manufacturing coal briquettes according to the embodiment of the present invention may further include a step of mixing water by adding water to the mixture after the providing of the mixture. In providing the mixture, the binder may be a water soluble binder. In the step of providing the mixture, the binder may be at least one selected from cellulose ether compound, PVA, Lignin, starch.

Cellulose ether compounds include methylcellulose (this hydroxyethylcellulose (HEC), hydroxypropylcellulose (HPC), hydroxypropylmethylcellulose (HPMC). And hydroxyethylmethylcell. It may include at least one compound selected from the group consisting of (HEMC).

The cellulose ether compound may not include carboxymethyl cel lulose (CMC). The viscosity of the cellulose ether compound may be between 4, 000 cps and 80, 000 cps. Method for producing coal briquettes according to an embodiment of the present invention may further comprise the step of drying the mixture after the step of mixing by adding water to the mixture.

In the providing of the coal briquettes, the amount of moisture contained in the coal briquettes may be 8wt% to 15wt%.

In the heat treatment step, the heating for the coal briquettes may be performed for 1 to 24 hours at a temperature of 80 to 150 ^° C.

In the heat treatment step, the coal briquettes may be heated to have a moisture content of 5 wt% or less.

In the heat treatment step, the coal briquettes are heated to have a compressive strength of 100 kgf or more. Can be.

In the heat treatment step, the coal briquettes ^ may be heated using at least one selected from hot air, steam, near infrared rays, and microwaves.

The heat treatment step may include transferring the coal briquettes to the storage bin, supplying hot hot air into the storage bin, heating the coal briquettes, and discharging the heat-treated coal briquettes from the storage bin.

In the heat treatment step, the temperature of the hot air introduced into the storage bin may be 80 to 150 ^° C.

The heat treatment step may further include discharging the water vapor evaporated from the coal briquettes by the hot hot air through the upper part of the storage bin.

Apparatus for manufacturing coal briquettes according to an embodiment of the present invention comprises a coal briquette machine manufactured in a briquette machine and a briquette machine for producing coal briquettes by mixing a mixture including fine coal and a water-soluble binder and a mixture mixed in the mixer. It may include a heat treatment to increase the compressive strength by heating.

It may further include a water supply for supplying water to the combiner. The heat treatment unit is connected to a briquette machine to store the coal briquettes, connected between the lower part of the storage bin and the heat source, and connected to the hot air supply pipe for supplying hot air into the storage bin, and to the upper blowwe storage bin installed in the hot air supply pipe to evaporate from the coal briquettes. It may include a discharge line for discharging the water vapor.

According to an embodiment of the present invention, a method for manufacturing molten iron includes i) providing coal briquettes manufactured according to the aforementioned method, ii) providing reduced iron obtained by reducing iron ore in a reduction furnace, and iii) melting gasification of coal briquettes and reduced iron. Charging the furnace to provide molten iron. In the step of providing reduced iron, the reduction furnace may be a fluidized bed reduction furnace or a packed bed reduction furnace.

Coal briquettes according to an embodiment of the present invention is charged into the dome of the molten gasifier in the molten iron gasifier comprising i) a molten gasifier is charged with reduced iron, and ii) a molten gasifier, and a reducing furnace providing reduced iron. It is heated rapidly. The coal briquettes may contain 5 wt% or less of water. The coal briquettes may have a compressive strength of 100 kgf or more.

【Effects of the Invention】 By increasing the compressive strength of the coal briquettes through heat treatment, the hot and cold strengths of the coal briquettes can be greatly improved also for coal briquettes produced using a water-soluble binder or water.

In addition, it is possible to secure the hot strength and the hot strength by increasing the compressive strength of the coal briquettes in a short time through rapid and efficient heat treatment.

In addition, by using a heat source in a conventional storage bin and steel mill, it is possible to effectively heat-treat the coal briquettes while minimizing the cost.

[Brief Description of Drawings]

1 is a schematic diagram showing a coal briquette manufacturing apparatus according to an embodiment of the present invention.

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

2 is a flowchart schematically illustrating a process of heat-treating the coal briquettes by the method for manufacturing coal briquettes according to an embodiment of the present invention.

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

FIG. 5 is a schematic diagram of another apparatus for manufacturing molten iron using the coal briquettes manufactured in FIG. 1.

Figure 6 is a graph showing the experimental results for the compressive strength of the coal briquettes prepared according to this embodiment.

Figure 7 is a graph showing the experimental results for the compressive strength of the coal briquettes prepared according to this embodiment.

8 is a graph showing the experimental results for the compressive strength of the coal briquettes prepared according to the present embodiment.

9 is a graph showing the experimental results for the compressive strength of the coal briquettes prepared according to the present embodiment.

[Specific contents to carry out invention]

Terms such as first, second, and third include various partial components, regions, 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 present 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.

Unless 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, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains can easily practice 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 an apparatus for manufacturing coal briquettes according to an embodiment of the present invention.

As shown in FIG. 1, the coal briquette manufacturing apparatus 60 includes a mixer 64 for mixing pulverized coal and a binder supplied from a pulverized coal hopper 61 for storing pulverized coal and a binder hopper 62 for storing a binder. Briquette machine 65 for forming a coal briquette by molding the mixture mixed in the mixer 64, a heat treatment unit for heating the coal briquettes produced in the briquette machine to increase the compressive strength. The manufacturing apparatus may further include a water supply unit 63 for supplying water to the combiner.

The briquette machine 65 is made of coal briquettes by compressing the mixture. For example, the briquette machine 65 may be provided with a pair of lorries, and may produce coal briquettes in the form of pockets or strips by inserting and compressing the mixture between the lorries.

The heat treatment unit is intended to increase the compressive strength by applying energy to the coal briquettes, and may have a structure of heating the coal briquettes by using high temperature hot air or by applying steam, near infrared rays or microwaves to the coal briquettes.

In this embodiment, the heat treatment unit is connected to the briquette machine 65 is connected between the storage bin 66, the lower storage bin 66 and the heat source 67 to accommodate the coal briquettes to supply hot air into the storage bin 66. It includes a hot air supply pipe 68, a blower 69 is installed in the hot air supply pipe.

The storage bin 66 stores the coal briquettes manufactured and conveyed in the briquette machine 65. The coal briquettes are supplied to the upper portion of the storage bin 66 and discharged through the lower portion. At the bottom of the storage bin 66, a discharge device for quantitatively discharging the coal briquettes is installed. For example, the discharge device is a constant discharged to 0 ~ 50t / h of coal briquettes stored in the storage bin.

A discharge line 70 for discharging water vapor evaporated from the coal briquettes is installed at an upper portion of the storage bin 66, and a dust collecting equipment 71 is connected to the discharge line 70. Thus, the crystals evaporated from the coal briquettes through heat treatment are discharged to the dust collector 71 for processing. In this case, when the temperature is lowered above the saturated steam pressure, the axial water may be generated, and a boeun device (not shown) may be further provided to prevent the axial water from entering the storage bin again.

The hot air supply pipe 68 is installed at one lower side of the storage bin 66. The hot air supplied into the storage bin 66 through the hot air supply pipe 68 is moved upward to heat the coal briquettes to evaporate the moisture contained in the coal briquettes. The blower 69 forcibly supplies the hot air heated by the heat source 67 to the hot air supply pipe.

The heat source 67 may be a structure using commercial fuel such as LNG or LPG. have. Alternatively, it may be a structure using a by-product gas in the steel mill, such as FOG, COG or BFG.

In addition, the heat source 67 may recover and use waste heat generated in a steel mill, such as a direct heating structure such as an electric heater or slag heat, waste heat generated when oxidized reduced iron is oxidized.

As such, by heat treating the coal briquettes by using a storage bin that serves as a conventional extra buffer in the process of transferring coal briquettes, it is possible to effectively secure sufficient strength within a short time without additional equipment investment.

Accordingly, even when the binder and that a sufficient strength of the water used or the binder itself, the water content increases as the water-soluble be secured initially seonghyeongtan can be heated to seonghyeongtan on seonghyeongtan production line ensuring a nyaenggan strength of seonghyeongtan soon _yo.

Figure 2 schematically shows a flow chart of a method for producing coal briquettes according to an embodiment of the present invention. The flowchart of the coal briquettes and the manufacturing method of FIG. 2 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 FIG. 2, the method for manufacturing coal briquettes includes: providing fine coal, (S100) mixing a binder with fine coal (S100) to provide a mixture (S200), and molding the mixture to provide coal briquettes ( S300), and a heat treatment step (S400) of heating the coal briquettes to increase the compressive strength.

In addition, the coal briquetting method according to an embodiment of the present invention may further comprise the step (S210) of mixing by adding water to the mixture of pulverized coal and a binder. In addition, if necessary, the method of manufacturing coal briquettes may further include other steps.

First, in step S100, pulverized coal is provided. As the pulverized coal, raw materials containing carbon such as bi tuminous coal, subbi tuminous coal, anthracite and coke may be used. The particle size of can be adjusted below 4 瞧. ^'

Next, in step S200, a binder is mixed with pulverized coal to provide a mixture. That is, after adding the binder to the pulverized coal, the mixture is mixed so that it is uniformly mixed. Mix well.

In this embodiment, the binder may be a water-soluble binder. The binder may be at least one selected from cellulose ether compounds, PVA, Lignin, and starch.

The viscosity of the cellulose ether compound may be 4, 000cps to 80,000cps. The viscosity of the cellulose ether compound was 20 ± 0. using DV-n + Pro (spindle HA) from Brookf ield. It means the value measured by measuring the viscosity of the aqueous solution of cellulose ether compound having a concentration of 2% by weight at 1 ^° C. When the viscosity of the cellulose ether compound is too low, the viscosity of the solution containing the cellulose ether compound, for example, an aqueous solution, is too low, thereby lowering the binding force to the pulverized coal. As a result, the strength of coal briquettes may be lowered. On the other hand, when the viscosity of the cellulose ether compound is too high, the molecular weight of the cellulose ether compound is too high, solubility deteriorates, and thus the binding force to the pulverized coal is not sufficient. Therefore, it is preferable to adjust the viscosity of the cellulose ether compound to the above-mentioned range.

The cellulose ether compound may be methyl cellulose (MC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), hydroxypropyl methyl cellulose (HPMC) or hydroxyethylmethol. Celrose (HEMC) and the like.

Methyl cellulose (MC) has a degree of methyl group substitution of 18 to 32wt>, and hydroxyethyl cellulose (HEC) has a degree of hydroxyethyl group substitution of 20 to 80%. Hydroxypropyl cellulose (HPC) has a hydroxypropyl group substitution degree of 20 to 80%, hydroxypropyl methyl cellulose (HPMC) has a methyl group substitution degree of 18 to 32% and a 2 to 14% It has a degree of substitution of hydroxypropyl group. In addition, hydroxyethyl methyl cellulose (HEMC) may have a degree of methyl group substitution of 18 to 32wt¾> and a degree of hydroxyethyl group substitution of 2 to 14%.

Next, in the step (S210) it can be mixed by adding water to the mixture. On the other hand, although not shown in Figure 2, it may be added after the step (S210) to dry the mixture. That is, when it is necessary to control the formability of the mixture containing pulverized coal, powdered cellulose ether compound and water, The mixture may be dried to remove some moisture. As a result, the strength of the coal briquettes produced in subsequent steps can be greatly improved.

In step S300, the mixture is molded to provide coal briquettes. Coal briquettes in the form of pockets or strips can be produced by charging the mixture between a pair of lorler and pressing.

Here, the amount of water contained in the coal briquettes manufactured through step S300 may be 8vvt% or more.

As such, by using a water-soluble binder or water in the process of mixing pulverized coal and a binder, the coal briquettes produced through the forming step may not be stratified due to excessive moisture content.

Thus, by heating the coal briquettes through the heat treatment step (S400), even the coal briquettes having a water content of 8wt% or more can be secured to the strength divided into coal briquettes,

As shown in Figure 3, the heat treatment step (S400) is a step of transporting the coal briquettes into the storage bin (S410), supplying hot hot air into the storage bin to heat the coal briquettes (S420), heat treated coal briquettes Ejecting from the storage bin (S430).

In addition, the heat treatment step may further include the step (S440) of discharging the water vapor evaporated from the coal briquettes by the hot hot air through the upper portion of the storage bin. In addition, if necessary, the heat treatment step may further include other steps.

In step S410, the coal briquettes are filled and filled into the storage bin. The level of coal briquettes in the storage bin is maintained at an appropriate level in consideration of the level at which the coal briquettes are not destroyed by the heat treatment time or the compression load of the coal briquettes in the storage bin.

In step S420, hot air is blown into the lower part of the storage bin. The temperature of the hot air introduced into the storage bin may be 80 to 150 ^° C.

If the temperature of the hot air is lower than 80 ^° C, moisture of the coal briquettes may not be evaporated properly, resulting in poor heat treatment. If the temperature exceeds 150 ^° C, the coal briquettes may be cracked, and volatile matters may be lost.

In the heat treatment step, the heating for coal briquettes is carried out at a temperature of 80 to 15 CTC. Under 1 to 24 hours. The higher the coal briquette heating temperature due to the hot air can shorten the heat treatment time, but in order to shorten it within 1 hour, hot coals must be applied at a high temperature, thereby causing loss of coal briquettes. In addition, as the coal briquettes are dried at a high temperature, only the moisture content is lowered, so that the compressive strength is rather lowered. When the coal briquette heating temperature is lower than 80 degrees, the time required for heat treatment exceeds 24 hours, and the productivity is lowered.

The heat treatment conditions may be relaxed or enhanced depending on the moisture content of the coal briquettes introduced into the storage bin.

Through the step S420, the coal briquettes are heated by hot air to evaporate moisture.

In step S430, the heat treated coal briquettes are discharged through the bottom of the storage bin. Water vapor evaporated from the coal briquettes through heat treatment is discharged to a dust collecting facility through step S440 and processed. At this time, by adjusting the flow rate and temperature of the hot air, it is possible to prevent the generation of condensed water.

The coal briquettes produced by the above-described method contains 5 wt% or less of water. In addition, the coal briquettes produced by the above-described method with a reduced moisture content have a compressive strength of 100 kgf or more. ᅳ

4 is according to this embodiment. The molten iron manufacturing apparatus 100 using the produced coal briquettes is shown schematically. The structure of the molten iron manufacturing apparatus 100 of FIG. 4 is only for illustration of this invention, Comprising: This invention is not limited to this. Therefore, FIG. 4 and the apparatus for manufacturing molten iron 100 may be modified in various forms.

The apparatus for manufacturing molten iron 100 of FIG. 4 includes a melt gasifier 10 and a packed-bed reduction furnace 20. In addition, other devices may be included as needed. In the layered layer reduction furnace 20, iron ore is charged and reduced. The iron ore charged into the packed-bed reduction furnace 20 is made of reduced iron while being pre-dried and then passed through the layered-layer reduction furnace 20. The layered layer reduction furnace 20 is a packed-bed reduction furnace, and receives the reducing gas from the melt gasifier 10 to form a layered layer therein. Since the coal briquettes produced according to this embodiment are charged into the melt gasifier 10, a coal seam layer is formed inside the melt gasifier 10. The dome part 101 is formed in the upper part of the melt gasifier 10. That is, a wider space is formed than the other parts of the melt gasification furnace 10, and there exists a high temperature reducing gas. Therefore, the coal briquettes charged into the dome portion 101 by the high temperature reducing gas are subjected to the pyrolysis reaction.

^Is converted to 의해 by The steam generated by the pyrolysis reaction of the coal briquettes moves to the lower part of the melt gasifier 10 to react with exothermic reaction with oxygen supplied through the tuyere 30. As a result, the coal briquettes can be used as a heat source for keeping the melt gasification furnace 10 at a high temperature. On the other hand, since the left provides air permeability, a large amount of gas generated in the lower portion of the melt gasifier 10 and the reduced iron supplied from the packed-bed reduction reactor 20 pass through the coal seam layer in the melt gasifier 10 more easily and uniformly. can do.

In addition to the coal briquettes described above, a bulk coal material or coke may be charged into the melt gasifier 10 as necessary. An air vent 30 is provided on the outer wall of the melt gasifier 10 to blow in oxygen. Oxygen is blown into the coal packed bed to form a combustion zone. The coal briquettes may be burned in a combustion zone to generate reducing gas.

5 schematically shows an apparatus for manufacturing molten iron 200 using coal briquettes manufactured according to the present embodiment. The structure of the apparatus for manufacturing molten iron 200 of FIG. 5 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. 5 may be modified in various forms. Since the structure of the apparatus for manufacturing molten iron 200 of FIG. 5 is similar to that of the apparatus for manufacturing molten iron 100 of FIG. 2, the same reference numerals are used for the same parts, and a detailed description thereof will be omitted.

As shown in FIG. 5, the molten iron manufacturing apparatus 200 includes a melt gasifier 10, a fluidized bed reduction furnace 22, a reduced iron compression device 40, and a compressed reduced iron storage tank 50. Here, the reduced reduced iron storage tank 50 can be omitted.

The produced coal briquettes are charged into the melt gasifier 10. Here, seonghyeongtan is generated a reducing gas in the melter-gasifier (10) and ^"generate a reducing gas is supplied to the fluidized-bed reduction reactor 22. The fine iron ores are reduced in a plurality of fluidized bed with a 22 It is made of reduced iron while being supplied and flowed by the reducing gas supplied from the melt gasifier 10 to the fluidized bed reduction furnace 22. The reduced iron is compressed by the reduced iron compression device 40 and then stored in the reduced reduced iron storage tank 50. Compressed reduced iron is compressed reduced iron _. Charged together with the coal briquettes from the storage tank 50 to the molten gasifier 10 is melted in the molten gasifier (10). Since the coal briquettes are supplied to the melt gasifier 10 and changed into air permeable, a large amount of gas and compressed reduced iron generated in the lower portion of the melt gasifier 10 make the coal seam layer in the melt gasifier 10 more easily and uniformly. Can pass through to provide high quality molten iron.

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.

Compressive strength measurement experiment of coal briquettes

Experimental Example

. Pulverized coal for coal briquettes and a binder having an average property used for molten reduced iron were prepared and mixed. Pulverized coal has a particle size of 4 mm or less. The pulverized coal was further mixed with a carbon source additive. As the binder, Ferrobine ™ binder provided by Sangsung Fine Chemical Co., Ltd. was used. 1 part by weight of the binder was added to 100 parts by weight of pulverized coal, and 7 parts by weight of fire was added to mix uniformly. Then, the prepared mixture was charged between a pair of rolls and compressed to prepare a coal briquette having a size of 52 ml. Detailed manufacturing process of the remaining coal briquettes can be easily understood by those of ordinary skill in the art, the detailed description thereof will be omitted.

The manufactured coal briquettes were heat-treated using a well-ventilated heat-treatment oven to evaporate moisture.

Experimental Example 1

The coal briquettes with an initial moisture content of 8.8 wt% and a compressive strength of 39.5 kgf were heated to heat the oven at a temperature of S 0 ^° C.

Experimental Example 2

Coal briquettes with an initial moisture content of 10.148 wt% and a compressive strength of 50.85 kgf The heat treatment was performed at a temperature of 100 ^° C in an oven.

Experimental Example 3

Coal briquettes having an initial moisture content of 9.63 wt% and a compressive strength of 52.21 kgf were heat-treated at a temperature of 120 ^° C. in a heat treatment oven.

Experimental Example 4

Coal briquettes having an initial moisture content of 9.21 wt% and a compressive strength of 51.36 kgf were heat-treated at a temperature of 150 ^° C. in a heat treatment oven.

Comparative Example 1

Coal briquettes prepared in the same manner as in Example were stored at room temperature for 24 hours.

Comparative Example 2

Coal briquettes manufactured in the same manner as in Example were heat-treated in 6 (rc. Comparative Example 3

Coal briquettes prepared in the same manner as in Example were heat-treated at 200 ^° C. Experiment result

Moisture and compressive strength of the coal briquettes prepared according to Experimental Examples 1 to 4 and Comparative Examples described above were measured. Compressive strength was measured using 30 coal briquettes manufactured in each of the experimental and comparative examples. The compression load of the coal briquettes was measured at the maximum load until the coal briquettes were destroyed by applying a constant speed to the top of the coal briquettes placed in the measuring device. The average value of 30 coal briquette samples was calculated | required.

As a result, in the case of Comparative Example 1 which was not subjected to heat treatment, the coal briquettes initially showed a compressive strength of 40 kgf, and after 24 hours at room temperature, the compressive strength was 70 kgf, and there was no sufficient strength improvement effect. When the coal briquettes were heat treated at 60 ^° C. as in Comparative Example 2, sufficient compressive strength was not obtained. Heat treatment at a high temperature of 200 ^° C. In one comparative example 3, cracks were generated to maintain the appearance of coal briquettes.

On the other hand, in the case of experimental examples, as shown in Figure 6 to 9, when the heat treatment for 1 to 24 hours at a temperature of 80 to 150 ^° C ^' , The compressive load was excellent. Therefore, it turned out that it is desirable to adjust the heat processing conditions of a coal briquette to the above-mentioned range. In contrast, the compressive load of the coal briquettes prepared according to the comparative examples was much smaller than that of the coal briquettes prepared according to the experimental examples. Therefore, it was confirmed that the coal briquettes manufactured by heat treatment as in Examples were much superior in terms of compressive load than the coal briquettes manufactured without heat treatment.

Although the present invention has been described above, it is readily apparent to those skilled in the art that various modifications and variations are possible without departing from the spirit and scope of the claims set out below.

One year to do

[Explanation of code]

10. Melt Gasification Furnace 20. Layered Layer Reduction Furnace

22. Fluidized Bed Reduction Furnace 30. Punggu

40. Reduced iron compression device 50. Reduced iron storage tank

60 Coal briquetting machine 61 Pulverized coal hopper

62 Binder Hopper 63 n Goggles

百 ᄋ W 丁

64 all-in-one 65 briquette machine

66 Storage Bin 67 Heat Source

68 Hot Air Supply Line 69 Blower

70 Discharge Line 71 Dust Collector

Claims

[Claim]

[Claim 1]

As a method for producing coal briquettes, which are charged into a dome of the molten gasifier in a molten iron manufacturing apparatus including a molten gasifier into which a reduced iron is charged and connected to the molten gasifier and providing a reduced iron. I) Steps to Provide Pulverized Coal

i i) mixing powdered binder with pulverized coal to provide a mixture, i i i) adding water to the mixture,

iv) compression molding the water-added mixture to provide coal briquettes, and

V) a heat treatment step of heating the coal briquettes to increase the compressive strength;

The powdery binder is methyl cellulose (MC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), hydroxypropyl methyl cellulose (HPMC) and hydroxyethyl methyl cell. It contains at least one compound selected from the group consisting of roose (HEMC),

Method for producing coal briquettes.

[Claim 2]

In crab 1,

Method of producing coal briquettes further comprising the step of drying the water-added mixture after the step of adding water to the mixture.

[Claim 3]

The method of claim 1,

In the step of providing the coal briquettes, the amount of water contained in the coal briquettes

Method for producing 8wt% to 15wtV¾ coal briquettes.

[Claim 4]

The method of claim 1,

In the heat treatment step, the heating for the coal briquettes is produced for 1 to 24 hours at a temperature of .80 to 150 ^° C.

[Claim 5]

The method of claim 4,

In the heat treatment step, the coal briquettes are heated so that the water content is less than 5wt¾>.

[Claim 6]

The method of claim 5,

In the heat treatment step, the coal briquettes are heated so that the compressive strength is more than lOOkgf.

[Claim 7]

The method of claim 1,

In the heat treatment step, the coal briquettes are heated using at least one selected from hot air, steam, near infrared rays, and microwaves.

[Claim 8]

The method of claim 1,

The heat treatment step, the step of transporting the coal briquettes into the storage bin, supplying hot hot air into the storage bin to heat the coal briquettes, and discharge the heat treated coal briquettes from the storage bin

Method for producing coal briquettes comprising a.

[Claim 9]

The method of claim 8,

The heat treatment step, the method of producing coal briquettes further comprising the step of discharging the water vapor evaporated from the coal briquettes by the hot wind blowing through the upper storage bin.

[Claim 10]

An apparatus for producing coal briquettes, which is charged into a dome of a molten gasifier in a molten iron manufacturing apparatus including a molten gasifier into which a reduced iron is charged, and a reducing furnace providing the reduced iron, and rapidly heated. A mixer for mixing a raw material containing a binder and a binder,

Water supply unit for supplying water to the combiner, Briquette machine for producing coal briquettes by molding the mixture mixed in the mixer, and

Heat treatment unit to increase the compressive strength by heating the coal briquettes manufactured in the briquette machine

Coal briquette manufacturing apparatus comprising a.

[Claim 11]

According to claim 10,

The heat treatment unit is connected to a briquette machine to accommodate the coal briquettes, the hot coal supply pipe is connected between the bottom of the storage bin and the heat source to supply hot air into the storage bin, a blower installed in the hot air supply pipe, and the coal briquettes connected to the upper storage bin Apparatus for producing coal briquettes including a discharge line for discharging steam evaporated from the gas.

[Claim 12]

Providing coal briquettes prepared according to claim 1,

Providing reduced iron reduced iron ore in a reduction furnace, and

The method comprising the seonghyeongtan and the reduced iron charged in the molten iron ball ^"in the melter-gasifier

A molten iron manufacturing method comprising a.

[Claim 13]

In paragraph 12,

In the step of providing the reduced iron, the reducing furnace is a molten iron manufacturing method is a fluidized bed-type reduction layer or layered layer reduction.

[Claim 14]

As a coal briquettes which are charged into a dome of a molten gasifier in a molten iron manufacturing apparatus including a molten gasifier into which a reduced iron is charged, and a reducing furnace that provides the reduced iron, and rapidly heated.

Coal briquettes contain less than 5wt% water.

[Claim 15]

The method of claim 14,

The coal briquettes have a compressive strength of lOOkgf or more.