WO2017082513A1

WO2017082513A1 - Coal briquette, method for manufacturing same, and method for manufacturing molten iron

Info

Publication number: WO2017082513A1
Application number: PCT/KR2016/007617
Authority: WO
Inventors: 박우일; 류진호; 김현정
Original assignee: 주식회사 포스코
Priority date: 2015-11-10
Filing date: 2016-07-13
Publication date: 2017-05-18
Also published as: CN108350379A; KR20170054869A; KR101766855B1

Abstract

Provided are a coal briquette and a method for manufacturing the same, the coal briquette being inserted into a domed portion of a melting gas brazier of a molten iron manufacturing device and is heated rapidly, the molten iron manufacturing device comprising a melting gas brazier, into which reduced iron is inserted, and a reducing furnace which is connected to the melting gas brazier and provides reduced iron. The method for manufacturing coal briquettes comprising the steps of: i) providing pulverized coal; ii) mixing the pulverized coal with a powder-type cellulose ether compound, thereby providing a coal blend; iii) preparing an aqueous solution containing polyvinyl alcohol; iv) providing a mixture by adding the aqueous solution containing polyvinyl alcohol to the coal blend; and v) providing a coal briquette by molding the mixture.

Description

【Specification】

[Name of invention]

Coal briquettes, a method of manufacturing the same, and a method of manufacturing molten iron

Technical Field

The present invention relates to a coal briquette, a production method thereof, and a molten iron production method. More specifically, the present invention relates to a coal briquette having improved binder performance while controlling uniform mixing order of a cellulose ether compound and polyvinyl alcohol (PVA) to improve binder performance, a manufacturing method thereof, and a molten iron manufacturing method.

BACKGROUND OF THE INVENTION [0002] In the molten steel reduction method, an 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 a 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 filling 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 and the reducing gas are discharged outside the melt gasifier and are supplied to the reducing furnace as reducing gas.

Coal briquettes are prepared by mixing pulverized coal and a binder. In order to use it for manufacturing molten iron, it is necessary to produce coal briquettes having excellent hot strength and hot strength. Therefore, the binder used in the coal briquettes should have a property of maintaining excellent adhesion and high strength at high temperatures.

[Content of invention]

Problem to be solved

Through one embodiment of the present invention to provide a method for producing coal briquettes having excellent hot strength and hot strength by commonly used PVA and cellulose ether binder according to the characteristics.

[Measures of problem]

Coal briquettes according to an embodiment of the present invention are connected to a molten gasifier, i) a molten gasifier, and Π) a molten gasifier, where reduced iron is charged, In a molten iron manufacturing apparatus including a reduction furnace, the molten gasifier is charged to the base of the molten gas furnace and rapidly heated. The method for producing coal briquettes includes: i) providing pulverized coal, ii) mixing powdered cellulose ether compound with pulverized coal, and providing mixed coal; iii) preparing an aqueous solution containing polyvinyl alcohol; iv) adding an aqueous solution comprising polyvinyl alcohol to the blended coal to provide a mixture and V) molding the mixture to provide coal briquettes.

In providing the blended coal, the amount of cellulose ether compound may be 0.3 parts by weight to 0.7 parts by weight based on 100 parts by weight of pulverized coal.

The cellulose ether compound is methyl cellulose (MC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), hydroxypropyl methyl salose (HPMC) and hydroxyethyl methyl cell At least one compound selected from the group consisting of Rhodes (HEMC).

The average particle size of the cellulose ether compound can be from 50 to 100.

The viscosity of the cellulose ether compound may be between 4, 000 cp and 80,000 cp. The aqueous solution containing polyvinyl alcohol is said polyvinyl. Alcohol may contain lwt% to 10wt%.

The polyvinyl alcohol may have a weight average molecular weight of 100,000 to 300,000.

The polyvinyl alcohol can have a viscosity of 28 cps to 47 cps.

Preparing an aqueous solution containing polyvinyl alcohol, from 60 ^° C.

It may be to dissolve the powdered polyvinyl alcohol in water at a temperature of 100 ^° C. In the step of providing a mixture by adding an aqueous solution containing polyvinyl alcohol to the blended coal, 6 parts by weight to 10 parts by weight of an aqueous solution containing polyvinyl alcohol may be added to 100 parts by weight of pulverized coal.

Drying the mixture before forming the mixture to provide coal briquettes. It may further comprise a step.

The method may further include drying the coal briquettes after molding the mixture to provide coal briquettes.

The method for manufacturing molten iron according to an embodiment of the present invention includes the steps of providing coal briquettes by the above-described method, providing a reduced iron obtained by reducing iron ore in a reduction furnace, and charging molten coal and reduced iron into a molten gasifier to provide molten iron. It includes.

In the step of providing reduced iron, the reduction furnace may be a fluidized bed reduction furnace or a layered bed reduction furnace.

Coal briquettes according to an embodiment of the present invention is charged into the bottom of the molten gasifier in the 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. The coal briquettes are 0.3 wt% to 0.7% salose ether compound, 0.3 wt% to 0.8 wt% polyvinyl alcohol, 3 wt% to 13% moisture, and the remaining fine coal.

0.4 wt% to 0.5% of a cellulose ether compound, 0.5 wt% to 0.6% of polyvinyl alcohol, 5 wt% to 11% of water, and the remaining fine coal.

【Effects of the Invention】

. By controlling the mixing order of the cellulose ether compound, molasses and the curing agent, the hot strength and the hot strength of the coal briquettes can be greatly improved. In addition, by reducing the amount of molasses with a high alkali content by using a cellulose ether compound having almost no alkali component, the phenomenon of adhesion to the reduction furnace due to the alkali component of the coal briquettes can be reduced.

[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 a coal briquette manufacturing apparatus 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. Drawing.

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

[Specific contents to carry out invention]

Terms such as first, second, and third are used to describe various parts, 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 wami generally understood by those skilled 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.

Figure 1 schematically shows a flow chart of a method for producing coal briquettes according to an embodiment of the present invention. 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 powdered cellulose ether compound with pulverized coal to provide a coal briquette (S20), and polyvinyl alcohol. Preparing an aqueous solution (S30), adding an aqueous solution containing polyvinyl alcohol to the blended coal (S40), and molding the mixture to provide coal briquettes (S50). . In addition, if necessary, the method of manufacturing coal briquettes may further include other steps.

First, in step S10, pulverized coal is provided. As pulverized coal, raw materials containing carbon such as bituminous coal, subbituminous coal, anthracite and coke can be used. The particle size of pulverized coal can be adjusted to 4 醒 or less.

Next, in step S20, powdered cells are pulverized to pulverized coal. Ether compounds are mixed to provide coal briquettes. In other words, the cellulose ether compound is added to the pulverized coal, and the mixed coal is mixed well so as to be uniformly mixed.

In this case, a powdered cellulose ether compound is used instead of the liquid phase. In the case of using a non-powdered solution of a cellulose ether compound, a low viscosity carboxymethyl cel lulose (CMC) solution is used to improve flowability. However, since a binder having a low viscosity is used, there is a problem in that the strength of coal briquettes is lowered. In addition, the cellulose ether compound in the form of a solution is difficult to maintain the components uniformly due to the separation of the layer, the transport cost is high because a special transport such as tank lorry is required during transport. In addition, since the cellulose ether compound solution is frozen during the winter, it is not easy to store.

In contrast, in the case of using a powdered cellulose ether compound, since the viscosity of the cellulose ether compound itself is high, coal briquettes having excellent strength can be produced. In addition, since the cellulose ether compound is used in a powder form, it is easy to keep the volume to be minimized, and there is an advantage of easy transportation. Furthermore, there is no need to worry about freezing during the winter season. Therefore, in one embodiment of the present invention to the powdered cellulose ether compound use.

The amount of the cellulose ether compound based on 100 parts by weight of pulverized coal may be 0.3 parts by weight to 0.7 parts by weight. If the cellulose ether compound is too small, a problem arises in that the strength of the coal briquettes produced is insufficient. If the amount of the cellulose ether compound is too large, a problem may occur in which the complex is attached to the molding machine in step S50 to be described later. Therefore, it is possible to control the amount of salulose ether compound in the above range.

The viscosity of the cellulose ether compound may be 4, 000cp to 80,000cp. The viscosity of the cellulose ether compound refers to a value obtained by measuring the viscosity of an aqueous solution of cellulose ether compound having a concentration of 2% by weight at 20 ± 0 JC using DV-n + Pro (spindle HA) of Brookf i eld. do. If the viscosity of the cellulose ether compound is too low, the binding force to the pulverized coal is lowered. As a result, the strength of the 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 so high that the water solubility is lowered, so that the binding force to the pulverized coal is not sufficient. Therefore, the viscosity of the cellulose ether compound can be adjusted to the above-mentioned range.

Cellulose ether. The compound may be methyl cellulose (MC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), hydroxypropyl methyl cellulose (HPMC) or hydroxyethyl methyl cellulose (HEMC). ) May be included.

Methylcellulose (MC) has a methyl group substitution degree of 18 wt% to 32%, and hydroxyethylcellose (HEC) has a hydroxyethyl group substitution degree of 20 wt% to 80%. And. Hydroxypropyl selreul to agarose (HPC) has a hydroxypropyl group degree of substitution of 20 wt% to about _80%,, with hydroxypropylmethylcellulose selreul FIG agarose (HPMC) is a methyl group substituted in the 18 wt% to 32% and 2 wt% to 14) of hydroxypropyl group substitution degree. In addition, hydroxyethylmethylcellose (HEMC) may have a methyl group substitution degree of 18 wt% to 32% and a hydroxyethyl group substitution degree of 2 wt% to 14%. Salorose ether compounds are used as carboxymethyl cel lulose, CMC) may not be included.

On the other hand, the average particle size of the powdered cellulose ether compound may be 50 to 100 ^ 1. If the particle size of the powdered cellulose ether compound is too small, the manufacturing process cost increases. In addition, when the particle size of the cellulose ether compound is too large, the specific surface area of the cellulose ether compound is small, its water solubility is lowered, and the strength of the coal briquettes manufactured using the cellulose ether compound may be lowered. Therefore, it is preferable to control the particle size of the powdered cell ether compound to the above-mentioned range. On the other hand, more specifically, the average particle size of the powdered cellulose ether compound may be 78. In this case, the particle size of the powdered cellulose ether compound may be 97% or more at 0.1 GPa or less. Next, in step (S30) to prepare an aqueous solution containing polyvinyl alcohol. At this time, in order to dissolve the polyvinyl alcohol uniformly, 6 (rc to

Powdered polyvinyl alcohol can be dissolved in water at a temperature of 100 ^° C. Specifically, a powdery polyvinyl alcohol may be added to water at a temperature of 6 (rc to ioo ° c), and thus, may be dissolved in more than 5 minutes.

Polyvinyl alcohol may be used that has a weight average molecular weight of 100,000 to 300,000, the viscosity is formed between 28cp to 47cp when a ⁴ % solution at room temperature is made, the degree of saponification is 88 to 99% polyvinyl alcohol You can choose.

An aqueous solution containing polyvinyl alcohol may be prepared to include lwt% to 10wt% of polyvinyl alcohol in step (S30). When an aqueous solution containing too little polyvinyl alcohol is used, a relatively large amount of water is added, and as a result, the water content in the coal briquettes produced is high, which may cause a problem in the strength of the coal briquettes. If an aqueous solution containing too much polyvinyl alcohol is used, problems may occur in the dispersion of the polyvinyl alcohol in the aqueous solution. Therefore, an aqueous solution having a concentration in the above range can be used.

Step S30 is constituted independently of the above-described step S10 and step S20. That is, step S30 may be performed after step S10 and step S20, and step S10 and step S20 may be performed after step S30. Step S10 and It is also possible to proceed with step S20 and step S30 simultaneously.

Next, in step S40, an aqueous solution containing polyvinyl alcohol is added to the blended coal to provide a mixture. When an aqueous solution containing polyvinyl alcohol is added to the coal briquettes in which the powdered cellulose ether compound is uniformly distributed, the cellulose ether compound dispersed in the pulverized coal is dissolved in the aqueous solution containing the polyvinyl alcohol. As a result, the strength of the coal briquettes produced by dissolving the dissolved cellulose ether compound with the fine coal can be greatly improved. As described above, the liquid cellulose ether compound is not immediately mixed with pulverized coal, but first, an aqueous solution containing polyvinyl alcohol is mixed with a mixture of powdered cellulose ether compound with pulverized coal. By separating, it is possible to produce coal briquettes having excellent strength and minimizing the process cost.

The amount of the aqueous solution containing polyvinyl alcohol may be added in an amount of 6 parts by weight to 10 parts by weight based on 100 parts by weight of pulverized coal. When the amount of the aqueous solution containing polyvinyl alcohol is too small, the amount of polyvinyl alcohol added may be lowered, thereby lowering the strength of the coal briquettes finally produced. When the amount of the aqueous solution containing polyvinyl alcohol is too high, a lot of water in the aqueous solution is added, and the water content in the coal briquettes to be produced increases, which may cause a problem in the strength of the coal briquettes. Therefore, an aqueous solution having a concentration in the above range can be used.

The amount of solids of the polyvinyl alcohol provided through the addition of an aqueous solution containing polyvinyl alcohol may be 0.3 to 0.8% relative to 100% of the total coal briquettes.

Meanwhile, although not shown in FIG. 1, a step of drying the complex after step S40 may be added. That is, when it is necessary to adjust the moldability of the mixture to which the aqueous solution containing pulverized coal, powdered cellulose ether compound, and polyvinyl alcohol is required, the mixture may be dried to remove some moisture. As a result, the coal briquetting workability and the strength of the coal briquettes can be greatly improved in a subsequent step.

Finally, in step S50, the mixture is molded to provide coal briquettes. For example, the coal briquettes in the form of pockets or strips can be produced by charging and compressing the mixture between a pair of lorries. As a result, coal briquettes having excellent hot strength and hot strength can be produced.

Here, the amount of cellulose ether compound contained in the coal briquettes may be 0.3wt% to 0.7%. More preferably, the amount of cellulose ether compound may be 0.4wt% to 0.5wt%. When the amount of cellulose ether compound is too large, the cost of manufacturing coal briquettes increases. In addition, when the amount of the cellulose ether compound is too small, the strength of coal briquettes is lowered because the layered binding force cannot be expressed. Therefore, it is preferable to adjust the amount of salose ether compound to the above-mentioned range.

On the other hand, the amount of polyvinyl alcohol contained in the coal briquettes may be 0.3wt% to 0.8 ^%. More preferably, the polyvinyl alcohol may be 0.5wt% to 0.6 ^%.

On the other hand, the amount of water contained in coal briquettes may be 3 wt% to 13 wt%. More preferably, the amount of moisture may be 5 wt% to 11%. If the amount of water is too large, there is a problem that the molding of the mixture is difficult. In addition, when the amount of moisture is too small, the intermetallic strength of the coal briquettes may be lowered. Therefore, it is preferable to adjust the amount of moisture in the above-mentioned range.

Therefore, the coal briquettes prepared by the above-described method includes 0.3 wt% to 0.7 wt% of a cellulose ether compound, 0.3 wt% to 0.8% of polyvinyl alcohol, 3 wt% to 13 ^% of water, and the remaining fine coal. More preferably, 0.4 wt to 0.5) of the cellulose ether compound may include 0.5 wt% to 0.6% polyvinyl alcohol, 5 wt% to 11% moisture, and the remaining fine coal. FIG. 2 schematically shows a coal briquette manufacturing apparatus 60 to which the method for producing coal briquettes shown 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 60 includes a pulverized coal hopper 61 for storing pulverized coal. Cellulose ether hopper for storing cellulose ether compounds (62), dissolution tank (63) for dissolving PVA in hot water to provide PVA aqueous solution, pulverized coal hopper (61) and cellulose ether ether hopper (62) Mixer 1 for mixing the ground pulverized coal with the cellulose ether compound, a second mixer for mixing the coal mixture supplied from the first mixer 64 and the PVA aqueous solution supplied from the dissolution tank 63 (65). ), And a molding machine 66 for forming coal briquettes by molding the mixed mixture from the second mixer 65. It may further include a heat treatment unit for lowering the moisture content by heating the coal briquettes produced in the molding machine (66).

The molding machine 66 compresses the mixture to produce coal briquettes. For example, the forming machine 66 may be provided with a pair of lorries, and may produce coal briquettes in the form of pockets or strips by charging and compressing the mixture between the lorers. The storage bin 67 stores the coal briquettes manufactured by the molding machine 66, and a discharge line 71 for discharging water vapor evaporated from the coal briquettes is installed at an upper portion of the storage bin 67, and the discharge line 71 collects dust. Facility 72 is connected. Thus, the water vapor evaporated from the coal briquettes through heat treatment is discharged to the dust collector 72 for treatment. 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 condensate from entering the storage bin again.

The hot air supply pipe 69 is installed at one lower side of the storage bin 67. A hot air supply pipe 69 to the through supplied to the storage bin 67. As the hot wind is to move to the upper heating the ^{seonghyeongtan,} evaporate the moisture contained in seonghyeongtan. The blower 70 supplies the hot air heated by the heat source 68 to the hot air supply pipe 69. FIG. 3 schematically shows a molten iron manufacturing apparatus 100 using the coal briquettes manufactured in FIG. 1. The structure of the apparatus for manufacturing molten iron 100 of FIG. 3 is merely for illustrating the present invention, but the present invention is not limited thereto. Therefore, the apparatus for manufacturing molten iron 100 of FIG. 3 may be modified in various forms.

The molten iron manufacturing apparatus 100 of FIG. 3 includes a melt gasification furnace 10 and a layered layer reduction furnace 20. In addition, other devices may be included as needed. In the packed-bed reduction furnace 20, iron ore is charged and reduced. Filled layer type The iron ore charged into the reduction furnace 20 is made of reduced iron while being pre-dried and then passed through the packed-bed reduction furnace 20. The layered layer reduction furnace 20 is a layered layer type reduction furnace, and receives a reducing gas from the melt gasifier 10 to form a packed layer therein.

Since the coal briquettes produced by the manufacturing method of FIG. 1 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 to the dome portion 101 by the high-temperature reducing gas are converted to char by a pyrolysis reaction. The char generated by the pyrolysis reaction of the coal briquettes moves to the lower part of the melt gasifier 10 and exothermicly reacts 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 above if necessary seonghyeongtan the lumped carbonaceous materials or cokes it may ^'be charged into the melter-gasifier 10. 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.

4 schematically shows a molten iron manufacturing apparatus 200 using the coal briquettes manufactured in FIG. 1. The structure of the apparatus for manufacturing molten iron 200 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 200 of FIG. 4 may be modified in various forms. Since the structure of the apparatus for manufacturing molten iron 200 of FIG. 4 is similar to that of the apparatus for manufacturing molten iron 100 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 apparatus for manufacturing molten iron 200 includes a molten gasifier 10, a fluidized bed reduction furnace 22, a reduced iron compression device 40, and a compressed reduced iron storage tank 50. Include. Here, the reduced reduced iron storage tank 50 can be omitted.

The produced coal briquettes are charged to a melt gasifier 10. Here, the coal briquettes generate a reducing gas in the melt gasification furnace 10 and the generated reducing gas is supplied to the fluidized bed reduction furnace 22. The iron ore is supplied to a plurality of reducing furnaces 22 having a fluidized bed, and is made of reduced iron while flowing 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. The compressed reduced iron is charged together with the coal briquettes from the compressed reduced iron storage tank 50 into the molten gasifier 10 and 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 makes the coal filling charge in the melt gasifier 10 easier and more uniform. It can be passed through to provide a flavor of molten iron.

On the other hand, in the coal briquettes, since the cellulose ether compound and polyvinyl alcohol which have little alkali component are used as a binder, the alkali component can be reduced. Therefore, the phenomenon in which an alkali such as potassium is deposited on a dispersion plate (not shown) or a cyclone (not shown) in the fluidized-bed reduction furnace 22 by molasses containing a high alkali component can be alleviated.

. 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.

Experimental Example

Fine coal of less than 3.4 kPa and cellulose ether compound powder of 0.2 kPa or less were mixed to give a mixed coal. Water was added to the powder PVA at 80 ^° C and mixed to prepare a PVA aqueous solution. A polyvinyl alcohol (PVA) aqueous solution was added to the blended coal to prepare a mixture. Pulverized coal was used as a mixture of strong coking coal, fine coal and powdered coke, and cellulose ether compound was used as hydroxyethyl methyl cellulose (HEMC, PB401) manufactured by Samsung Fine Chemicals. PVA is a product of Japan KURARAY POVAL, and 50 wt% of two PVA224 and PVA117 were used. And the mixture between a pair of It charged and manufactured the coal briquettes. In this case, a pair of squeeze pressurized the mixture at a pressure of 20 kN / cm to produce a pillow-shaped coal briquette of the size of 64.5 瞧 X 25.4 瞧 X 19. 1mm. Detailed manufacturing process of the remaining coal briquettes can be easily understood by those skilled in the art, and detailed description thereof will be omitted. Compressive strength measurement experiment of coal briquettes

The compression load of the coal briquettes was measured at the maximum load when the coal briquettes were compressed at a rate of 50 kW / min, and the average value of 20 coal briquettes was measured. Drop strength measurement experiment of coal briquettes

Drop quality was measured by measuring the drop strength index of the manufactured coal briquettes. ^The drop strength index was expressed as a weight percentage of particle size of 20 mm or more after freely dropping the manufactured coal briquettes 4 times at a height of 5 m. Hot strength measurement experiment of coal briquettes

After charging a sample of coal briquettes at room temperature at a temperature of 280 mm with a rotating diameter of 1000 ^° C. at a time, the reaction was carried out for 60 minutes at a rotational speed of 10 rpm. In this case, the reaction gas is inert nitrogen, and the reaction tube temperature is maintained at 1000 ^° C. during reaction. The coal briquette char generated after the reaction was analyzed by particle size and expressed as a percentage of the weight of the coal briquettes 10% or more based on the total weight of the coal briquettes. Experimental Example 1

100 parts by weight of pulverized coal and 0.51 parts by weight of HEMC powder having an average particle size of 78 kPa and a viscosity of 28, 000 cps were first mixed, and then 7 parts by weight of a 7% PVA aqueous solution was added thereto to prepare a coal briquette. The coal briquettes prepared were stored at 80 ^° C. for 24 hours and then measured for strength. Experimental Example 2 .100 parts by weight of pulverized coal and 0.44 parts by weight of HEMC powder having an average particle size of 78 // m and a viscosity of 28,000 cps were first mixed, and then 7 parts by weight of a PVA aqueous solution having a concentration of 8 wt% was added thereto to prepare a coal briquette. The coal briquettes prepared were stored at 80 ^° C. for 24 hours and then measured for strength. Experimental Example 3

100 parts by weight of pulverized coal, an average particle size of 78, and 0.37 parts by weight of HEMC powder having a viscosity of 28,000 cps were first mixed, and then mixed by adding 7 parts by weight of a 9% PVA aqueous solution having a concentration of coal briquettes. The coal briquettes prepared were stored at 80 ^° C. for 24 hours and then measured for strength. Comparative Example 1

100 parts by weight of pulverized coal, 1 part by weight of HEMC powder having an average particle size of 78, and a viscosity of 28,000 cps were first mixed, and then 7 parts by weight of water was added to mix, to prepare coal briquettes. The coal briquettes prepared were stored at 80 ^° C. for 24 hours and then measured for strength. Comparative Example 2

100 parts by weight of pulverized coal and 10 parts by weight of a PVA aqueous solution having a concentration of 10% were added thereto, and the coal briquettes were prepared. The coal briquettes prepared were stored at 80 ^° C. for 24 hours and then measured for strength. Comparative Example 3

1 part by weight of PVA was mixed with 100 parts by weight of pulverized coal, and 7 parts by weight of water was mixed to prepare coal briquettes. The coal briquettes prepared were stored at 80 ^° C. for 24 hours and then measured for strength. Comparative Example 4

-Attempted to add 12% PVA aqueous solution to 100 parts by weight of pulverized coal, but it did not dissolve well and the viscosity was too high for uniform stirring It was possible. Comparative Example 5

10 parts by weight of an aqueous solution containing 6 ¾ PVA and 4) HEMC was added to 100 parts by weight of pulverized coal, but the dissolution was not good and the viscosity was too high to uniformly stir. Experiment result

Compressive strength, drop strength and hot strength of the coal briquettes prepared according to Experimental Examples 1 to 3 and Comparative Examples 1 to 3 described above were measured. The results are shown in Table 1 below.

TABLE 1

As shown in Table 1, in Experimental Examples 1 to 3 it can be confirmed that the compressive strength, dropping strength and hot strength of the coal briquettes. In particular, it can be confirmed that Experimental Example 1 is particularly excellent in terms of hot strength than Experimental Example 2 and Experimental Example 3.

In the case of Comparative Example 1 using cellulose ether binder alone, all the strengths were found to be good, but it is expected to be the most expensive in terms of the binder cost. In the process, quality deviations between the coal briquettes are caused by insufficient binder dissolution time. Next, in the case of Comparative Example 2 using PVA alone, the compressive strength and the drop strength were excellent, but the hot strength was weak. Next, in the case of Comparative Example 3 using PVA in the form of a powder it can be seen that all the strength is weak. In Comparative Example 4 and Comparative Example 5, the test was not possible due to the increase in the viscosity.

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. Melt Gasification Furnace 20. Packed Bed 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 Cellulose Ether Hopper 63 Solvent

64 Geo 1 1 Combiner 65 Second Mixer

66 Molding Machine 67 Storage Bin

68 heat source 69 hot air supply pipe

70 Blower 71 Discharge Line

72 Dust collection equipment 100 200. Iron manufacturing equipment

101 Dome

Claims

[Claim]

[Claim 1]

A molten gas furnace in which reduced iron is charged, and

A method for producing coal briquettes which is connected to the melt gasifier and is charged to the bottom of the melt gasifier in a molten iron manufacturing apparatus including a reduction furnace for providing the reduced iron, wherein the coal briquettes are rapidly heated.

Providing pulverized coal,

Mixing powdered salolos ether compound with the pulverized coal to provide a coal blend;

Preparing an aqueous solution containing polyvinyl alcohol;

Adding an aqueous solution containing the polyvinyl alcohol to the blended coal to provide a mixture; and

Shaping the mixture to provide coal briquettes.

[Claim ² ]

The method of claim 1,

In the step of providing a coal blend, the amount of the cellulose ether compound relative to 100 parts by weight of the pulverized coal is 0.3 to 0.7 parts by weight of the production of coal briquettes ^ method.

[Claim 3]

According to claim 1,

The cellulose ether compound is methyl cellulose (MC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), hydroxypropyl methyl cellulose (HPMC) and hydroxyethyl methyl A process for producing coal briquettes, which is at least one compound selected from the group consisting of cellulose (HEMC).

[Claim 4]

In U,

Method for producing coal briquettes having an average particle size of the cellulose ether compound is 50 kPa to 100. [Claim 5]

According to claim 1,

The viscosity of the cellulose ether compound is 4, 000cp to 80,000cp method of producing coal briquettes.

5.

[Claim 6]

The method of claim 1,

The aqueous solution containing the polyvinyl alcohol is a method for producing coal briquettes containing lwt% to 10wt% of the polyvinyl alcohol.

[Claim 7]

According to 0 Total 1,

^"The polyvinyl alkoeul manufacturing method of the seonghyeongtan 100,000 to about 30 weight average molecular weight of all men.

[Claim 8].

The method of claim 1,

5 The method for producing coal briquettes wherein the polyvinyl alcohol has a viscosity of 28 cps to 47 cps;

【Claim 9】.

The method of claim 1,

The preparing of the aqueous solution containing the polyvinyl alcohol is a method of producing coal briquettes in which powder polyvinyl alcohol is dissolved in water at a temperature of 6C C0 to 10CTC.

[Claim 10]

According to claim 1,

In the step of providing the 5 common compounds by addition of an aqueous solution containing said polyvinyl alcohol in said blended shots, would that with respect to the pulverized coal 100 parts by addition of 6 to ^"10 parts by weight of an aqueous solution containing the polyvinyl alcohol Method of making coal briquettes.

[Claim 11]

The method of claim 1,

0 prior to shaping the mixture to provide coal briquettes, Method for producing coal briquettes further comprising the step of drying.

[Claim 12]

In U,

And drying the coal briquettes after molding the mixture to provide coal briquettes.

[Claim 13]

In U,

The ratio of the amount of water contained in the coal briquettes is 7 to 20 method for producing coal briquettes.

[Claim 14].

Providing the coal briquettes prepared according to claim 1,

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

And charging molten coal gas into the molten gasifier to provide molten iron.

[Claim 15]

The method of claim 14,

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

[Claim 16]

A molten gas furnace in which reduced iron is charged, and

As coal briquettes connected to the molten gasifier, charged in the dome of the molten gasifier in a molten iron manufacturing apparatus including a reducing furnace for providing the reduced iron, and rapidly heated,

Coal briquettes comprising 0.3 wt% to 0.7% of a cellulose ether compound, 0.3 wt% to 0.8% polyvinyl alcohol, 3 wt 3 to 13% moisture, and the remaining fine coal.

[Claim 17]

The method of claim 16,

0.4 wt% to 0.5% salose ether compound, 0.5 wt% to 0.6 wt% polyvinyl alcohol, 5 wt% to 1¼ «moisture and remaining fine coal Coal briquettes containing.