CN112358892A - Method for preparing reducing gas by using anthracite as gas-based direct reduced iron system - Google Patents

Method for preparing reducing gas by using anthracite as gas-based direct reduced iron system Download PDF

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CN112358892A
CN112358892A CN202011119430.7A CN202011119430A CN112358892A CN 112358892 A CN112358892 A CN 112358892A CN 202011119430 A CN202011119430 A CN 202011119430A CN 112358892 A CN112358892 A CN 112358892A
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gas
anthracite
layer
reducing gas
gasification furnace
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杨丽超
李金洲
王红林
潘攀
马伟
张海峰
张蕊红
申改燕
车丽玮
王莉
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Shanxi Jincheng Anthracite Mining Group Technology Research Institute Co ltd
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Shanxi Jincheng Anthracite Mining Group Technology Research Institute Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/46—Gasification of granular or pulverulent flues in suspension
    • C10J3/48—Apparatus; Plants
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/46—Gasification of granular or pulverulent flues in suspension
    • C10J3/48—Apparatus; Plants
    • C10J3/50—Fuel charging devices
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    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/46—Gasification of granular or pulverulent flues in suspension
    • C10J3/48—Apparatus; Plants
    • C10J3/52—Ash-removing devices
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/72—Other features
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
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    • C10J3/725—Redox processes
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    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/72—Other features
    • C10J3/82—Gas withdrawal means
    • C10J3/84—Gas withdrawal means with means for removing dust or tar from the gas
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/002—Removal of contaminants
    • C10K1/003—Removal of contaminants of acid contaminants, e.g. acid gas removal
    • C10K1/004—Sulfur containing contaminants, e.g. hydrogen sulfide
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/002—Removal of contaminants
    • C10K1/003—Removal of contaminants of acid contaminants, e.g. acid gas removal
    • C10K1/005—Carbon dioxide
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/02—Dust removal
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/02—Dust removal
    • C10K1/026—Dust removal by centrifugal forces
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/04—Purifying combustible gases containing carbon monoxide by cooling to condense non-gaseous materials
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/08—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/0073—Selection or treatment of the reducing gases
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0903—Feed preparation
    • C10J2300/0909—Drying
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0913—Carbonaceous raw material
    • C10J2300/093—Coal
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0953—Gasifying agents
    • C10J2300/0959—Oxygen
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0953—Gasifying agents
    • C10J2300/0973—Water
    • C10J2300/0976—Water as steam
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/10—Reduction of greenhouse gas [GHG] emissions
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  • Manufacture Of Iron (AREA)

Abstract

A method for preparing reducing gas by using anthracite as a gas-based direct reduced iron system belongs to the technical field of preparation of reducing gas used by the gas-based direct reduced iron system, and can solve the problem that the development of the iron making process by the gas-based direct reduction method is limited due to shortage of natural gas resources. The invention has the advantages of rich raw materials, moderate gas production rate of a single furnace, small occupied area, good environmental protection, adjustable hydrogen-carbon ratio of gas and the like, can replace natural gas to provide reducing gas for a gas-based direct reduced iron system, and has wide prospect.

Description

Method for preparing reducing gas by using anthracite as gas-based direct reduced iron system
Technical Field
The invention belongs to the technical field of preparation of reducing gas used by a gas-based direct reduced iron system, and particularly relates to a method for preparing reducing gas by using anthracite as the gas-based direct reduced iron system.
Background
The gas-based direct reduced iron system is a process for making iron by using gas as a reducing agent, and the main component of the reducing gas is H2And CO, CO + H2More than 90 percent and the hydrogen-carbon ratio is 1.5-2.0. Because the gas-based direct reduction ironmaking has the advantages of low carbon, environmental protection, high product quality and the like, the method is one of the most advanced and promising ironmaking process technologies in the world at present. At present, the world is gas-basedThe reduction iron making adopts natural gas as most reduction gas. The resource characteristics of rich coal, poor oil and less gas in China determine that the direct reduced iron technology taking natural gas as a gas source cannot be vigorously developed, and the method is also one of the main reasons for limiting the development of the iron-making process in China. Therefore, an economical and efficient method for preparing reducing gas is one of the main research contents of the gas-based direct reduction iron making method.
Disclosure of Invention
The invention aims at the problem that the development of the iron-making process by the gas-based direct reduction method is limited due to the shortage of natural gas resources, provides a method for preparing reducing gas by taking anthracite as a raw material and a pressurized moving bed as a gasification process, has the advantages of rich raw materials, moderate single-furnace gas production rate, small occupied area, good environmental protection, adjustable hydrogen-carbon ratio of gas and the like, can replace natural gas to provide reducing gas for a gas-based direct reduction iron system, and has wide prospect.
The invention adopts the following technical scheme:
a method for preparing reducing gas by using anthracite as a gas-based direct reduced iron system, when a pressurized moving bed gasification device runs, anthracite raw materials are added from the top of a gasification furnace through a coal bunker, the raw materials move from top to bottom, sequentially pass through a drying layer, a dry distillation layer, a reduction layer, an oxidation layer and an ash layer, reversely contact with a gasification agent introduced into the bottom of the gasification furnace and react, and the method specifically comprises the following steps:
firstly, when a pressurized moving bed gasification device runs, anthracite raw materials are added from the top of a gasification furnace through a coal bunker, move from top to bottom, sequentially pass through a drying layer, a dry distillation layer, a reduction layer, an oxidation layer and an ash layer, and reversely contact and react with a gasification agent introduced into the bottom of the gasification furnace;
secondly, a gasification agent used in the pressurized moving bed gasification process is formed by mixing pure oxygen and medium-pressure steam of a steam pipe network, is introduced from the bottom of a gasification furnace, exchanges heat with an ash layer at first, then enters an oxidation layer to contact with a hot coal layer to generate an oxidation combustion reaction to generate carbon dioxide, and the temperature of the gas is raised to 1200 ℃; the reacted gas enters the reduction layer upwards and CO2The steam and the anthracite coal are subjected to reduction reaction to generate CO and H2The reaction is endothermic, and the gas temperature is rapidly reduced from 1200 ℃ to 800 ℃; the gas enters the dry distillation layer and the drying layer upwards, contacts anthracite added from the top of the gasification furnace, exchanges heat, carries unreacted water vapor, volatile components escaping from dry distillation in the fuel and evaporated water to an outlet at the top of the gasification furnace, and the temperature of the gas is about 500-600 ℃;
thirdly, the gas from the top outlet of the gasification furnace is coarse reducing gas, after dust removal by a cyclone separator, further temperature reduction and dust removal are carried out by a venturi and a washing tower, and the temperature is reduced to 200-300 ℃;
fourthly, mixing the dedusted and cooled crude reducing gas with additional saturated steam, and adjusting the hydrogen-carbon ratio to 1.5-2.0 through a sulfur-tolerant shift device;
fifthly, the transformed gas passes through a low-temperature methanol washing absorption tower to remove harmful component H in the crude reducing gas2S and most of the CO2And (4) gas, namely final reducing gas, and sending the final reducing gas to a gas-based reduced iron system.
In the first step, the anthracite has a particle size of 6-50mm, an as-received basis ash content of 12-14%, an as-received basis fixed carbon content of 71-74%, an as-received basis volatile component content of 6-8%, an as-received basis moisture content of 6%, an as-received basis total sulfur content of less than 0.5%, a softening temperature of more than 1500 ℃, a crushing strength of more than 90% and a thermal stability of more than 90%.
In the first step, the pressurized moving bed gasification device consists of a gasification furnace with an internal part and a jacket, a coal lock for coal feeding and an ash lock for ash discharge are directly connected with the gasification furnace, and the pressure of the gasification furnace is 0.5-4 MPa.
In the second step, the pure oxygen concentration is more than 99%, and the steam is formed by mixing two parts of jacket self-produced saturated steam and superheated steam sent by a steam pipe network.
In the third step, the crude reducing gas comprises the following components in percentage by volume: CO: 29 to 32% and H2：40~42%、CH4：1.5~8%、CO2：14~23%、N2：0.1~0.2%、H2S: 0.1 to 0.2% and O2 ：0.1~0.2%。
In the fifth stepThe final reducing gas comprises CO and H2And H2S, wherein CO + H2More than 90 percent, the hydrogen-carbon ratio is 1.5-2, H2The S content is less than 1 ppm.
The invention has the following beneficial effects:
1. the coal gasification and the iron making process are combined, so that the development of the domestic gas-based direct reduction iron process can be promoted.
The natural gas is generally used as the raw material to prepare the reducing gas in the world, the development of the iron making process by the gas-based direct reduction method is limited due to the shortage of the natural gas in China, the process is based on the domestic advanced coal gasification process, the reducing gas is produced by taking domestic abundant coal resources as the raw material, and the development of the gas-based direct reduced iron process in China is promoted.
2. The process has the advantages of small investment and low cost for preparing the reducing gas.
Compared with the natural gas and the electrolytic water for preparing the reducing gas, the cost for preparing the reducing gas by the pressurized moving bed gasification process is lower; compared with the novel entrained flow gasification process, the process has smaller scale and lower investment, and is more suitable for matching with a mainstream gas-based reduced iron system with not too large scale.
3. The difficulty of wastewater treatment is greatly reduced, and the method is more energy-saving and environment-friendly.
The pressurized moving bed system is used for preparing reducing gas, the gasification temperature is relatively low, the water washing unit is relatively complex, however, if anthracite is used as a raw material, the coalification degree is highest, impurities carried in gas components are few, the design scale of the sewage treatment unit is greatly reduced, and the energy-saving and environment-friendly effects are achieved.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
A method for preparing reducing gas by using anthracite as a gas-based direct reduced iron system, when a pressurized moving bed gasification device runs, anthracite raw materials are added from the top of a gasification furnace through a coal bunker, the raw materials move from top to bottom, sequentially pass through a drying layer, a dry distillation layer, a reduction layer, an oxidation layer and an ash layer, reversely contact with a gasification agent introduced into the bottom of the gasification furnace and react, and the method specifically comprises the following steps:
firstly, when a pressurized moving bed gasification device runs, anthracite raw materials are added from the top of a gasification furnace through a coal bunker, move from top to bottom, sequentially pass through a drying layer, a dry distillation layer, a reduction layer, an oxidation layer and an ash layer, and reversely contact and react with a gasification agent introduced into the bottom of the gasification furnace;
secondly, a gasification agent used in the pressurized moving bed gasification process is formed by mixing pure oxygen and medium-pressure steam of a steam pipe network, is introduced from the bottom of a gasification furnace, exchanges heat with an ash layer at first, then enters an oxidation layer to contact with a hot coal layer to generate an oxidation combustion reaction to generate carbon dioxide, and the temperature of the gas is raised to 1200 ℃; the reacted gas enters the reduction layer upwards and CO2The steam and the anthracite coal are subjected to reduction reaction to generate CO and H2The reaction is endothermic, and the gas temperature is rapidly reduced from 1200 ℃ to 800 ℃; the gas enters the dry distillation layer and the drying layer upwards, contacts anthracite added from the top of the gasification furnace, exchanges heat, carries unreacted water vapor, volatile components escaping from dry distillation in the fuel and evaporated water to an outlet at the top of the gasification furnace, and the temperature of the gas is about 500-600 ℃;
thirdly, the gas from the top outlet of the gasification furnace is coarse reducing gas, after dust removal by a cyclone separator, further temperature reduction and dust removal are carried out by a venturi and a washing tower, and the temperature is reduced to 200-300 ℃;
fourthly, mixing the dedusted and cooled crude reducing gas with additional saturated steam, and adjusting the hydrogen-carbon ratio to 1.5-2.0 through a sulfur-tolerant shift device;
fifthly, the transformed gas passes through a low-temperature methanol washing absorption tower to remove harmful component H in the crude reducing gas2S and most of the CO2And (4) gas, namely final reducing gas, and sending the final reducing gas to a gas-based reduced iron system.
Examples
The particle size is 6-50mm, the content of the received base ash is 12-14%, the content of the received base fixed carbon is 71-74%, the content of the received base volatile component is 6-8%, the content of the received base moisture is 6%, the content of the received base total sulfur is less than 0.5%, and the softening temperature (T) is2) Greater than 1500 deg.C, crushing strength greater than 90%, and heat stabilityAnthracite with the property of more than 90 percent enters a gasification furnace after being pressurized by a normal pressure coal bunker and a coal lock, the pressure of the gasification furnace is 2.5 MPa, and the coal feeding amount of a single furnace is 15 t/h.
6900 Nm of gasifying agent oxygen399.6 percent (MPa) and 25.5t/h (270 ℃, 2.6 MPa) of steam, and the mixture enters a gasification furnace from the bottom after being mixed and is in reverse contact with coal to generate oxidation-reduction reaction. The crude reducing gas is discharged from the upper part of the gasification furnace, and the gas production rate of a single furnace is 35000Nm3The pressure is 2.3 MPa, the temperature is 520 ℃, and the volume percentage of each component is as follows: CO 31% and H242%、CH4 5%、CO2 21%、N2 0.14%、H20.16 percent of S and 0.7 percent of other S, and further cooling and dedusting the crude reducing gas by a venturi and a washing tower after the crude reducing gas is dedusted by a cyclone separator, and the temperature is reduced to about 260 ℃.
The crude reducing gas after dust removal and temperature reduction and additional saturated steam (2.3 MPa, 21000 Nm)3H) after mixing, carrying out shift reaction in a sulfur-resistant shift furnace, and adjusting the hydrogen-carbon ratio to be 2:1, namely: CO 23.6%, H2 45.3%、CH4 4.7%、CO225.5%、N2 0.13%、H20.15% of S and 0.62% of the others.
The converted gas passes through a low-temperature methanol washing absorption tower to absorb H in the gas2S and CO2Gas of H2Reducing the S content to below 1ppm to obtain final reducing gas (the volume percentage of each component is CO30.5% and H)2 58.5%、CH4 5%、CO2<3%、H2S <1ppm, other 3%) and sent to a gas-based reduced iron system.

Claims (6)

1. A method for preparing reducing gas by using anthracite as a gas-based direct reduced iron system is characterized by comprising the following steps: when the pressurized moving bed gasification device operates, anthracite raw materials are added from the top of the gasification furnace through a coal bunker, the raw materials move from top to bottom, sequentially pass through a drying layer, a dry distillation layer, a reduction layer, an oxidation layer and an ash layer, and reversely contact and react with a gasification agent introduced into the bottom of the gasification furnace, and the method specifically comprises the following steps:
firstly, when a pressurized moving bed gasification device runs, anthracite raw materials are added from the top of a gasification furnace through a coal bunker, move from top to bottom, sequentially pass through a drying layer, a dry distillation layer, a reduction layer, an oxidation layer and an ash layer, and reversely contact and react with a gasification agent introduced into the bottom of the gasification furnace;
secondly, a gasification agent used in the pressurized moving bed gasification process is formed by mixing pure oxygen and medium-pressure steam of a steam pipe network, is introduced from the bottom of a gasification furnace, exchanges heat with an ash layer at first, then enters an oxidation layer to contact with a hot coal layer to generate an oxidation combustion reaction to generate carbon dioxide, and the temperature of the gas is raised to 1200 ℃; the reacted gas enters the reduction layer upwards and CO2The steam and the anthracite coal are subjected to reduction reaction to generate CO and H2The reaction is endothermic, and the gas temperature is rapidly reduced from 1200 ℃ to 800 ℃; the gas enters the dry distillation layer and the drying layer upwards, contacts anthracite added from the top of the gasification furnace, exchanges heat, carries unreacted water vapor, volatile components escaping from dry distillation in the fuel and evaporated water to an outlet at the top of the gasification furnace, and the temperature of the gas is about 500-600 ℃;
thirdly, the gas from the top outlet of the gasification furnace is coarse reducing gas, after dust removal by a cyclone separator, further temperature reduction and dust removal are carried out by a venturi and a washing tower, and the temperature is reduced to 200-300 ℃;
fourthly, mixing the dedusted and cooled crude reducing gas with additional saturated steam, and adjusting the hydrogen-carbon ratio to 1.5-2.0 through a sulfur-tolerant shift device;
fifthly, the transformed gas passes through a low-temperature methanol washing absorption tower to remove harmful component H in the crude reducing gas2S and most of the CO2And (4) gas, namely final reducing gas, and sending the final reducing gas to a gas-based reduced iron system.
2. The method for preparing reducing gas by using anthracite as a gas-based direct reduced iron system according to claim 1, which is characterized in that: in the first step, the anthracite has a particle size of 6-50mm, an as-received basis ash content of 12-14%, an as-received basis fixed carbon content of 71-74%, an as-received basis volatile component content of 6-8%, an as-received basis moisture content of 6%, an as-received basis total sulfur content of less than 0.5%, a softening temperature of more than 1500 ℃, a crushing strength of more than 90% and a thermal stability of more than 90%.
3. The method for preparing reducing gas by using anthracite as a gas-based direct reduced iron system according to claim 1, which is characterized in that: in the first step, the pressurized moving bed gasification device consists of a gasification furnace with an internal part and a jacket, a coal lock for coal feeding and an ash lock for ash discharge are directly connected with the gasification furnace, and the pressure of the gasification furnace is 0.5-4 MPa.
4. The method for preparing reducing gas by using anthracite as a gas-based direct reduced iron system according to claim 1, which is characterized in that: in the second step, the pure oxygen concentration is more than 99%, and the steam is formed by mixing two parts of jacket self-produced saturated steam and superheated steam sent by a steam pipe network.
5. The method for preparing reducing gas by using anthracite as a gas-based direct reduced iron system according to claim 1, which is characterized in that: in the third step, the crude reducing gas comprises the following components in percentage by volume: CO: 29 to 32% and H2：40~42%、CH4：1.5~8%、CO2：14~23%、N2：0.1~0.2%、H2S: 0.1 to 0.2% and O2 ：0.1~0.2%。
6. The method for preparing reducing gas by using anthracite as a gas-based direct reduced iron system according to claim 1, which is characterized in that: the composition of the final reducing gas in the fifth step comprises CO and H2And H2S, wherein CO + H2More than 90 percent, the hydrogen-carbon ratio is 1.5-2, H2The S content is less than 1 ppm.
CN202011119430.7A 2020-10-19 2020-10-19 Method for preparing reducing gas by using anthracite as gas-based direct reduced iron system Pending CN112358892A (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107151720A (en) * 2017-07-12 2017-09-12 北京中晋中石冶金化工技术有限公司 A kind of Lurgi gasifying gas converts the system and method for producing DRI through steam

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
CN107151720A (en) * 2017-07-12 2017-09-12 北京中晋中石冶金化工技术有限公司 A kind of Lurgi gasifying gas converts the system and method for producing DRI through steam

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