EP3348627B1 - Verfahren zur herstellung eines kohlebriketts und verfahren zur herstellung von eisenschmelze - Google Patents

Verfahren zur herstellung eines kohlebriketts und verfahren zur herstellung von eisenschmelze Download PDF

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Publication number
EP3348627B1
EP3348627B1 EP16844545.0A EP16844545A EP3348627B1 EP 3348627 B1 EP3348627 B1 EP 3348627B1 EP 16844545 A EP16844545 A EP 16844545A EP 3348627 B1 EP3348627 B1 EP 3348627B1
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EP
European Patent Office
Prior art keywords
coal
producing
coal briquette
ether compound
cellulose ether
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EP16844545.0A
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English (en)
French (fr)
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EP3348627A4 (de
EP3348627A1 (de
Inventor
Jin Ho Ryou
Sang Ho Yi
Woo Il Park
Seok In Park
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Posco Holdings Inc
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Posco Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10LFUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L5/00Solid fuels
    • C10L5/02Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
    • C10L5/06Methods of shaping, e.g. pelletizing or briquetting
    • C10L5/10Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders
    • C10L5/105Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders with a mixture of organic and inorganic binders
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10LFUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L5/00Solid fuels
    • C10L5/02Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
    • C10L5/06Methods of shaping, e.g. pelletizing or briquetting
    • C10L5/10Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders
    • C10L5/22Methods of applying the binder to the other compounding ingredients; Apparatus therefor
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10LFUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L5/00Solid fuels
    • C10L5/02Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
    • C10L5/34Other details of the shaped fuels, e.g. briquettes
    • C10L5/36Shape
    • C10L5/361Briquettes
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10LFUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L2290/00Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/02Combustion or pyrolysis
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10LFUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L2290/00Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/04Gasification
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10LFUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L2290/00Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/08Drying or removing water
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10LFUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L2290/00Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/14Injection, e.g. in a reactor or a fuel stream during fuel production
    • C10L2290/146Injection, e.g. in a reactor or a fuel stream during fuel production of water
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10LFUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L2290/00Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/24Mixing, stirring of fuel components
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10LFUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L2290/00Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/28Cutting, disintegrating, shredding or grinding
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10LFUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L2290/00Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/30Pressing, compressing or compacting
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10LFUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L2290/00Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/32Molding or moulds

Definitions

  • Coal briquettes, methods for producing the same, and methods for producing molten iron are related. More particularly, coal briquettes, producing methods thereof, and methods for producing molten iron having improved binder performance by controlling a mixing order of a cellulose ether compound, molasses, and a hardener and thus by mixing them uniformly are related.
  • a reduced iron smelting method iron ore is used in a reducing furnace and a melting and gasification furnace that smelts reduced iron ore.
  • coal briquettes as a heat source to smelt the iron ore are inserted into the melting and gasification furnace.
  • the coal briquettes that are inserted into the melting and gasification furnace form a coal-packed bed.
  • Oxygen is injected through a tuyere that is installed in the melting and gasification furnace such that the coal-packed bed is burned to generate a combustion gas.
  • the combustion gas is converted to a reducing gas of a high temperature while moving upward through the coal-packed bed.
  • the reducing gas of a high temperature is discharged to the outside of the melting and gasification furnace to be supplied to a reducing furnace as a reducing gas.
  • the coal briquettes are manufactured by mixing and then compressing pulverized coal and a binder. It is necessary to manufacture coal briquette having improved cold strength and hot strength so that the coal briquette is used to manufacture molten iron. Accordingly the coal briquette is manufactured by using a binder, such as molasses, having improved viscosity.
  • Coal briquette having improved cold strength and hot strength is provided by controlling a blending order of a cellulose ether compound, molasses, and a hardener.
  • a method of producing the coal briquette is provided.
  • a method of producing molten iron including the method of producing the coal briquette is provided.
  • Coal briquette according to an example embodiment of the present invention is inserted into a dome part of a melting and gasification furnace and then rapidly heated therein in a molten iron manufacturing apparatus including i) the melting and gasification furnace into which reduced iron is inserted and ii) a reducing furnace connected to the melting and gasification furnace and providing the reduced iron.
  • a method of manufacturing a coal briquette includes i) providing pulverized coal, ii) producing a coal blend by mixing the pulverized coal with a powder-shaped cellulose ether compound, iii) adding water to the coal blend, iv) producing a mixture by mixing the coal blend including water with a hardener and molasses, and v) producing a coal briquette by molding the coal blend.
  • an amount of the cellulose ether compound included in the coal briquette is 0.1 wt% to 0.7 wt%
  • an amount of the hardener is 0.5 wt% to 3.0 wt%
  • an amount of the molasses is 3 wt% to 12 wt%. More preferably, an amount of the cellulose ether compound may be 0.2 wt% to 0.5 wt%, an amount of the hardener may be 1.0 wt% to 2.5 wt%, and an amount of the molasses may be 5 wt% to 10 wt%.
  • an amount of moisture included in the coal briquette may be 3 wt% to 13 wt%. More preferably, an amount of moisture included in the coal briquette may be 5 wt% to 11 wt%.
  • a ratio of the amount of moisture included in the coal briquette relative to the amount of the cellulose ether compound included in the coal briquette may be 5 to 40.
  • a ratio of the amount of moisture included in the coal briquette relative to the amount of the cellulose ether compound included in the coal briquette may be 7 to 20.
  • an average particle size of the cellulose ether compound may be 50 ⁇ m to 100 ⁇ m. More preferably, in the step of providing the mixture, a ratio of an average particle size of the pulverized coal relative to an average particle size of the cellulose ether compound may be 7 to 30. A ratio of an average particle size of the pulverized coal relative to an average particle size of the cellulose ether compound may be 10 to 20.
  • the cellulose ether compound may include at least one compound selected from the group consisting of methyl cellulose (MC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), hydroxypropylmethyl cellulose (HPMC), and hydroxyethylmethyl cellulose (HEMC).
  • MC methyl cellulose
  • HEC hydroxyethyl cellulose
  • HPMC hydroxypropylmethyl cellulose
  • HEMC hydroxyethylmethyl cellulose
  • Viscosity of the cellulose ether compound may be 4,000 cps to 80,000 cps.
  • the hardener is quicklime, slaked lime, calcium carbonate, limestone, cement, bentonite, clay, silica, silicate, dolomite, phosphoric acid, or sulfuric acid.
  • a method of producing a coal briquette according to an example embodiment of the present invention may further include drying the mixture before producing the coal briquette by molding the mixture or drying the coal briquette after producing the coal briquette.
  • a method of producing molten iron according to an example embodiment of the present invention includes i) producing the coal briquette manufactured according to the method, ii) providing reduced iron by reducing iron ore in a reducing furnace, and iii) producing molten iron by inserting the coal briquette and the reduced iron into a melting and gasification furnace.
  • the reducing furnace may be a fluidized-bed reducing furnace or a packed-bed reducing furnace.
  • Coal briquette according to an example embodiment of the present invention is inserted into a dome part of a melting and gasification furnace and then rapidly heated therein in a molten iron manufacturing apparatus including i) the melting and gasification furnace into which reduced iron is inserted and ii) a reducing furnace connected to the melting and gasification furnace and providing the reduced iron.
  • the coal briquette includes 0.1 wt% to 0.7 wt% of a cellulose ether compound, 0.5 wt% to 3.0 wt% of a hardener, 3 wt% to 12 wt% of molasses, 3 wt% to 13 wt% of moisture, and a balance of pulverized coal.
  • it may include 0.2 wt% to 0.5 wt% of the cellulose ether compound, 1.0 wt% to 2.5 wt% of the hardener, 5 wt% to 10 wt% of the molasses, 5 wt% to 11 wt% of the moisture, and a balance of the pulverized coal.
  • the skilled person may note that some elements of the description to follow do not fall under the scope of the claims. To the extent that such a disparity exists, such disclosure is to be understood as mere supporting information that does not form part of the invention. The invention is defined by the claims alone.
  • a hot strength and a cold strength of the coal briquette may be remarkably improved by controlling a blending order of the cellulose ether compound, molasses, and hardener.
  • the cellulose ether compound including almost no alkali component is used to decrease an amount of the molasses including a high alkali content and thus reduce an attachment of the coal briquette to a reducing furnace due to the alkali component.
  • first, second, and third are used to illustrate various portions, components, regions, layers, and/or sections, but not to limit them. These terms are used to discriminate the portions, components, regions, layers, or sections from other portions, components, regions, layers, or sections. Therefore, a first portion, component, region, layer, or section as described below may be a second portion, component, region, layer, or section within the scope of the present invention.
  • FIG. 1 schematically shows flowchart of a method for producing coal briquettes according to an example embodiment of the present invention.
  • the flowchart of the method for producing coal briquettes of FIG. 1 is an exemplary flowchart, and the present invention is not limited thereto.
  • the producing method of coal briquettes may be variously modified.
  • the method of producing a coal briquette includes providing pulverized coal (S10), producing a coal blend by mixing the pulverized coal with a powder-shaped cellulose ether compound (S20), adding water to the coal blend to mix them (S30), producing a mixture by mixing the coal blend including water with a hardener and molasses (S40), and producing a coal briquette by molding the coal blend (S50).
  • the method of producing the coal briquette may further include other steps as needed.
  • the pulverized coal may be a raw material including carbon such as bituminous coal, subbituminous coal, anthracite, coke, and the like.
  • a particle size of the pulverized coal may be controlled to be 4 mm or less.
  • the pulverized coal is mixed with a cellulose ether compound to provide a coal blend.
  • the cellulose ether compound is added to the pulverized coal, and the mixture is uniformly mixed to provide a coal blend.
  • the cellulose ether compound is not liquid but powder-shaped.
  • a binder solution a carboxylmethyl cellulose (CMC) solution may be used to secure better flowability by using a binder itself having low viscosity.
  • the binder having low viscosity may deteriorate strength of a coal briquette.
  • a liquid-type binder may not uniformly maintain a binder component due to a layer separation and also needs a special transport vehicle such as a tank lorry and the like and thus costs high.
  • the binder solution is frozen during winter season and thus may not be easily stored.
  • the powder-shaped cellulose ether compound when used as a binder, the cellulose ether compound itself has high viscosity and thus may provide a coal briquette having excellent strength.
  • the cellulose ether compound since the cellulose ether compound is powder-shaped, the cellulose ether compound may be packed into a minimum volume and thus easily stored and also simply transported. Furthermore, it is free from being frozen during winter season. Accordingly, the powder-shaped cellulose ether compound is appropriate for use.
  • Viscosity of the cellulose ether compound may be in a range of 4,000 cps to 80,000 cps.
  • the viscosity of the cellulose ether compound is obtained by measuring viscosity of a cellulose ether compound aqueous solution having a concentration of 2 wt% at 20 ⁇ 0.1 ° C with DV-II+Pro (spindle HA) made by Brookfield Ametek.
  • a solution including the cellulose ether compound for example, an aqueous solution including the cellulose ether compound has too low viscosity, and thus a binding force of the cellulose ether compound with the pulverized coal is decreased.
  • the cellulose ether compound may include methyl cellulose (MC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), hydroxypropylmethyl cellulose (HPMC) or hydroxyethylmethyl cellulose (HEMC), and the like.
  • the methyl cellulose (MC) has a degree of substitution with a methyl group in a range of 18 wt% to 32 wt%
  • the hydroxyethyl cellulose (HEC) has a degree of substitution with a hydroxyethyl group in a range of 20 wt% to 80 wt%.
  • the hydroxypropyl cellulose has a degree of substitution with a hydroxypropyl group in a range of 20 wt% to 80 wt%
  • the hydroxypropylmethyl cellulose HPMC
  • HPMC hydroxypropylmethyl cellulose
  • the hydroxyethylmethyl cellulose HEMC
  • the cellulose ether compound may not include carboxylmethyl cellulose (CMC).
  • an average particle size of the powder-shaped cellulose ether compound may be in a range of 50 ⁇ m to 100 ⁇ m.
  • the powder-shaped cellulose ether compound has too small a particle size, its producing process cost is increased.
  • a specific surface area of the cellulose ether compound becomes smaller, and dissolubility of the cellulose ether compound is decreased, and accordingly, a strength of a coal briquette produced by using the cellulose ether compound may be decreased. Accordingly, a particle diameter of the powder-shaped cellulose ether compound may be adjusted within the above range.
  • an average particle size of the powder-shaped cellulose ether compound may be 78 ⁇ m.
  • a particle diameter of the powder-shaped cellulose ether compound may be in a range of less than or equal to 0.18 mm and greater than or equal to 97 %.
  • a ratio of the average particle size of the pulverized coal relative to the average particle size of the cellulose ether compound may be 7 to 30.
  • the ratio of the average particle size of the pulverized coal relative to the average particle size of the cellulose ether compound may be 10 to 20.
  • the ratio of the average particle size may be maintained within the above range.
  • a coal briquette having excellent strength with a minimum process cost may be produced not by directly mixing the liquid binder with the pulverized coal but by separating processes into mixing the liquid binder with the powder-shaped cellulose ether compound first and then, adding water thereto.
  • a hardener and molasses are added to the coal blend to which the water is added to prepare a mixture.
  • the hardener is used in a range of 0.5 wt% to 3.0 wt%, and the molasses is used in a range of 3 wt% to 12 wt%.
  • the hardener is quicklime, slaked lime, calcium carbonate, limestone, cement, bentonite, clay, silica, silicate, dolomite, phosphoric acid, or sulfuric acid.
  • the binder and the hardener may have no sufficient chemical bond and secure no sufficient strength of a coal briquette.
  • the hardener when the hardener is included in too large an amount, an ash component in a coal briquette is increased, and the coal briquette may not sufficiently play a role of a fuel in a melting-gasifying furnace. Accordingly, the hardener may be adjusted within the above range.
  • the molasses When the molasses is used in too small an amount, a strength of a coal briquette may be deteriorated. In addition, when the molasses is used in too large an amount, the molasses may have a problem of adherence and the like during molding the mixture. Accordingly, the molasses may be adjusted within the above range. Specifically, the hardener may be included in a range of 1.0 wt% to 2.5 wt%, and the molasses may be included in a range of 5 wt% to 10 wt%.
  • the mixture may include moisture in an amount of 1 wt% to 13 wt%.
  • the hardener and the molasses have stronger affinity for water than that of the cellulose ether compound.
  • the hardener and the molasses having affinity for water reacts moisture first, and thus the cellulose ether compound may not be completely dissolved in the water.
  • a step of drying the mixture after the step (S40) may be added.
  • the mixture may be dried to remove a part of moisture.
  • manufacture workability of a coal briquette in a subsequent process and a strength of the coal briquette may be much improved.
  • the mixture is molded in the step S50 to provide a coal briquette.
  • the mixture is inserted between a pair of rollers and compressed to produce the coal briquette to have a pocket or strip shape.
  • a coal briquette having excellent hot strength and cold strength may be provided.
  • an amount of the cellulose ether compound included in the coal briquette may be 0.1 wt% to 0.7 wt%. More preferably, the amount of the cellulose ether compound may be 0.2 wt% to 0.5 wt%.
  • the amount of the cellulose ether compound When the cellulose ether compound is included in too large an amount, a producing cost of a coal briquette is increased.
  • the cellulose ether compound when the cellulose ether compound is included in too small an amount, a sufficient binding force may not be exhibited, and thus a strength of a coal briquette is decreased. Accordingly, the amount of the cellulose ether compound needs to be adjusted within the above range.
  • an amount of the hardener included in the coal briquette may be 0.5 wt% to 3.0 wt%. More preferably, the amount of the hardener may be 1.0 wt% to 2.5 wt%.
  • the binder and the hardener may have no sufficient chemical bond and thus fail in sufficiently securing a strength of a coal briquette.
  • the amount of the hardener is too large, an ash component in a coal briquette is increased, and thus the coal briquette may not play a sufficient role of a fuel in a melting-gasifying furnace. Accordingly, the amount of the hardener may be adjusted within the above range.
  • an amount of the molasses included in the coal briquette may be 3 wt% to 12 wt%. More preferably, the amount of the molasses may be 5 wt% to 10 wt%.
  • the amount of the molasses may be adjusted within the above range.
  • an amount of moisture included in the coal briquette may be 3 wt% to 13 wt%. More preferably, the amount of the moisture may be 5 wt% to 11 wt%. In addition, when the amount of the moisture is too small, a cold strength of a coal briquette may be decreased. Accordingly, the amount of the moisture may be adjusted within the above range.
  • the coal briquette manufactured according to the method includes 0.1 wt% to 0.7 wt% of a cellulose ether compound, 0.5 wt% to 3.0 wt% of a hardener, 3 wt% to 12 wt% of molasses, 3 wt% to 13 wt% of moisture, and a balance of pulverized coal. More preferably, it may include 0.2 wt% to 0.5 wt% of the cellulose ether compound, 1.0 wt% to 2.5 wt% of the hardener, 5 wt% to 10 wt% of the molasses, 5 wt% to 11 wt% of the moisture, and a balance of the pulverized coal.
  • FIG. 2 schematically illustrates a molten iron manufacturing apparatus 100 using the coal briquettes manufactured in FIG. 1 .
  • a structure of the molten iron manufacturing apparatus 100 of FIG. 2 is exemplary, and the present invention is not limited thereto. Therefore, the structure of the molten iron manufacturing apparatus 100 of FIG. 2 may be variously modified.
  • the molten iron manufacturing apparatus 100 of FIG. 2 includes a melting and gasification furnace 10 and a packed-bed reducing furnace 20. In addition, it may include other devices as needed. Iron ore is inserted into the packed-bed reducing furnace 20 and then reduced. The iron ore inserted into the packed-bed reducing furnace 20 is dried in advance and then passed through the packed-bed reducing furnace 20 such that reduced iron is manufactured.
  • the packed-bed reducing furnace 20 is a packed-bed reducing furnace and receives the reducing gas from the melting and gasification furnace 10 to form a packed bed therein.
  • the coal briquette manufactured by the method of FIG. 1 is inserted in to the melting and gasification furnace 10 and thus a coal-packed bed is formed in the melting and gasification furnace 10.
  • a dome part 101 is provided in an upper portion of the melting and gasification furnace 10. That is, a space that is wider than other portions of the melting and gasification furnace 10 is formed, and high-temperature reducing gas exists in the space.
  • the coal briquette inserted into the dome part 101 is converted into char through a thermal decomposition reaction by a high-temperature reducing gas.
  • the char generated from the thermal decomposition reaction of the coal briquette moves to the bottom of the melting and gasification furnace 10 and then exothermically reacts with oxygen supplied through a tuyere 30.
  • the coal briquette may be used as a heat source that maintains the melting and gasification furnace 10 at a high temperature. Meanwhile, since char provides ventilation, a large amount of gas generated from the lower portion of the melting and gasification furnace 10 and reduced iron supplied from the packed-bed reducing furnace 20 may more easily and uniformly pass through the coal-packed bed the melting and gasification furnace 10.
  • lump carbon ash or coke may be inserted into the melting and gasification furnace 10 as needed.
  • the tuyere 30 is provided in an exterior wall of the melting and gasification furnace 10 for injection of oxygen. Oxygen is injected into the coal-packed bed such that a combustion zone is formed. The coal briquette is combusted in the combustion zone to generate the reducing gas.
  • FIG. 3 schematically illustrates another molten iron manufacturing apparatus 200 using the coal briquette manufactured in FIG. 1 .
  • a structure of the molten iron manufacturing apparatus 200 of FIG. 3 is an exemplarily structure, and the present invention is not limited thereto. Therefore, the structure of the molten iron manufacturing apparatus 200 of FIG. 3 may be variously modified.
  • the structure of the molten iron manufacturing apparatus 200 of FIG. 3 is similar to the structure of the molten iron manufacturing apparatus 100 of FIG. 2 , and therefore like reference numerals designate like elements in the molten iron production apparatus 100 of FIG. 2 , and a detailed description thereof will be omitted.
  • the molten iron manufacturing apparatus 200 includes a melting and gasification furnace 10, a fluidized-bed reducing furnace 22, reduced iron compression device 40, and a compression reduced iron storage bath 50.
  • the compression reduced iron storage bath 50 may be omitted.
  • the manufactured coal briquettes are inserted into the melting and gasification furnace 10.
  • the coal briquettes generate a reducing gas in the melting and gasification furnace 10 and the reducing gas is supplied to the fluidized-bed reducing furnace 22.
  • Fine iron ores are supplied to a plurality of reducing furnaces 22 having fluidized beds, and are fluidized by a reducing gas supplied to the fluidized-bed reducing furnace 22 from the melting and gasification furnace 10 such that reduced iron is manufactured.
  • the reduced iron is compressed by the reduced iron compression device 40 and stored in the compression reduced iron storage bath 50.
  • the compressed reduced iron is inserted into the melting and gasification furnace 10 from the compression reduced iron storage bath 50 together with coal briquettes and then molten in the melting and gasification furnace 10.
  • the briquette coal is supplied to the melting and gasification furnace 10 and converted into char having ventilation, and as a result, a large amount of gas generated at the bottom of the melting and gasification furnace 10 and the compressed reduced iron more easily and uniformly pass through a coal-packed bed in the melting and gasification furnace 10, such that molten iron with high quality may be provided.
  • alkali components may be reduced. Therefore, it is possible to prevent a dispersing plate (not illustrated) or a cyclone (not illustrated) in the fluidized-bed reducing furnace 22 from being clogged due to the deposition of alkali components such as potassium by the molasses containing a large amount of alkali components.
  • pulverized coal less than or equal to 0.2 mm of cellulose ether compound powder, water, quicklime as a hardener, and molasses are mixed in order to prepare a mixture.
  • pulverized coal a mixture of hard coking coal, semi soft coking coal, and cokes power was used, and as for the cellulose ether compound, hydroxypropylmethyl cellulose (HPMC, Mecellose®) made by Samsung Fine Chemicals Co., Ltd. was used. The obtained mixture was inserted between a pair of rolls to produce a coal briquette.
  • the pair of rolls was used under a pressure of 20 kN/cm, and the coal briquette was produced to have a size of 64.5 mm x 25.4 mm x 19.1 mm and a pillow shape.
  • the other detail producing process of the coal briquette may be easily understood by a person having an ordinary skill in a related art of the present invention, and thus its detailed description will be omitted.
  • a drop strength and a compression load of the coal briquettes according to Experimental Examples 1 to 2 and Comparative Examples 1 to 3 were measured.
  • the drop strength of each coal briquette was obtained from a ratio of coal briquettes having a diameter of greater than or equal to +20 mm after freely 4 times dropping the 2 kg of the coal briquette from 5 M high.
  • the compression load of each coal briquette was measured as a maximum load when compressed at a speed of 50 mm/min, an average compression load of 20 coal briquette specimens was obtained, and the results are shown in Table 1.

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  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
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Claims (10)

  1. Verfahren zum Produzieren von Kohlebriketts, die dafür geeignet sind, in einen Kuppelteil eines Schmelz- und Vergasungsofen eingeführt zu werden und in einer Eisenschmelze-Herstellungsvorrichtung schnell erhitzt zu werden,
    wobei die Eisenschmelze-Herstellungsvorrichtung Folgendes umfasst:
    einen Schmelz- und Vergasungsofen, in welchen reduziertes Eisen eingeführt werden kann, und
    einen Reduktionsofen, der mit dem Schmelz- und Vergasungsofen verbunden ist und dafür geeignet ist, das reduzierte Eisen bereitzustellen,
    wobei das Verfahren Folgendes umfasst:
    Bereitstellen pulverisierter Kohle,
    Produzieren einer Kohlemischung durch Mischen der pulverisierten Kohle mit einer pulverförmigen Celluloseether-Verbindung,
    Hinzufügen von Wasser zu der Kohlemischung, um dieselbe zu mischen,
    Produzieren eines Gemischs durch Mischen der Kohlemischung, einschließlich Wasser, mit einem Härtemittel und Melasse, und
    Produzieren eines Kohlebriketts durch Schmelzen der Kohlemischung,
    wobei bei dem Schritt des Produzierens des Kohlebriketts die Menge der Celluloseether-Verbindung, die in dem Kohlebrikett enthalten ist, 0,1 Gew.-% bis 0,7 Gew.-% beträgt, eine Menge des Härtemittels 0,5 Gew.-% bis 3,0 Gew.-% beträgt und eine Menge der Melasse 3 Gew.-% bis 12 Gew.-% beträgt,
    wobei es sich bei dem Härtemittel um ungelöschten Kalk, gelöschten Kalk, Calciumcarbonat, Kalkstein, Zement, Bentonit, Ton, Siliciumdioxid, Silicat, Dolomit, Phosphorsäure oder Schwefelsäure handelt.
  2. Verfahren zum Produzieren des Kohlebriketts nach Anspruch 1, wobei
    eine Menge der Celluloseether-Verbindung 0,2 Gew.-% bis 0,5 Gew.-% beträgt, eine Menge des Härtemittels 1,0 Gew.-% bis 2,5 Gew.-% beträgt und eine Menge der Melasse 5 Gew.-% bis 10 Gew.-% beträgt.
  3. Verfahren zum Produzieren des Kohlebriketts nach Anspruch 1, wobei
    bei dem Schritt des Produzierens des Kohlebriketts die Menge an Feuchtigkeit, die in dem Kohlebrikett enthalten ist, 3 Gew.-% bis 13 Gew.-% beträgt.
  4. Verfahren zum Produzieren des Kohlebriketts nach Anspruch 3 wobei
    die Menge an Feuchtigkeit, die in dem Kohlebrikett enthalten ist, 5 Gew.-% bis 11 Gew.-% beträgt.
  5. Verfahren zum Produzieren des Kohlebriketts nach Anspruch 1, wobei
    ein Verhältnis der Feuchtigkeit, die in dem Kohlebrikett enthalten ist, relativ zu der Menge der Celluloseether-Verbindung, die in dem Kohlebrikett enthalten ist, 5 zu 40 beträgt.
  6. Verfahren zum Produzieren des Kohlebriketts nach Anspruch 1, wobei
    die Celluloseether-Verbindung mindestens eine Verbindung beinhaltet, die ausgewählt ist aus der Gruppe bestehend aus Methylcellulose (MC), Hydroxyethylcellulose (HEC), Hydroxypropylcellulose (HPC), Hydroxypropylmethylcellulose (HPMC) und Hydroxyethylmethylcellulose (HEMC).
  7. Verfahren zum Produzieren des Kohlebriketts nach Anspruch 1, wobei eine Viskosität der Celluloseether-Verbindung 4.000 cps bis 80.000 cps beträgt,
    wenn die Viskosität der Celluloseether-Verbindung in einer wässrigen Lösung mit einer Konzentration von 2 Gew.-% bei 20 ± 0,1 °C gemessen wird.
  8. Verfahren zum Produzieren des Kohlebriketts nach Anspruch 1, wobei
    das Verfahren ferner Trocknen des Gemischs vor Produzieren des Kohlebriketts durch Formen des Gemischs beinhaltet.
  9. Verfahren zum Produzieren des Kohlebriketts nach Anspruch 1, wobei
    das Verfahren ferner Trocknen des Gemischs nach Produzieren des Kohlebriketts durch Formen des Gemischs beinhaltet.
  10. Verfahren zum Produzieren von Eisenschmelze, umfassend Produzieren des Kohlebriketts, das gemäß Anspruch 1 hergestellt ist,
    Bereitstellen des reduzierten Eisens durch Reduzieren von Eisenerz in einem Reduktionsofen, und
    Produzieren von Eisenschmelze durch Einführen des Kohlebriketts und des reduzierten Eisens in einen Schmelz- und Vergasungsofen.
EP16844545.0A 2015-09-08 2016-04-01 Verfahren zur herstellung eines kohlebriketts und verfahren zur herstellung von eisenschmelze Active EP3348627B1 (de)

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PCT/KR2016/003411 WO2017043725A1 (ko) 2015-09-08 2016-04-01 성형탄, 그 제조 방법 및 용철 제조 방법

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