WO2011017995A1 - Procédé de réutilisation de gaz de houille effluent comme gaz réducteur dans un procédé de réduction directe - Google Patents

Procédé de réutilisation de gaz de houille effluent comme gaz réducteur dans un procédé de réduction directe Download PDF

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Publication number
WO2011017995A1
WO2011017995A1 PCT/CN2010/075407 CN2010075407W WO2011017995A1 WO 2011017995 A1 WO2011017995 A1 WO 2011017995A1 CN 2010075407 W CN2010075407 W CN 2010075407W WO 2011017995 A1 WO2011017995 A1 WO 2011017995A1
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WO
WIPO (PCT)
Prior art keywords
gas
direct reduction
direct
rich
reducing
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PCT/CN2010/075407
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English (en)
Chinese (zh)
Inventor
陈凌
郭敏
李佳楣
彭华国
张涛
Original Assignee
中冶赛迪工程技术股份有限公司
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Publication of WO2011017995A1 publication Critical patent/WO2011017995A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
    • 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
    • C10K3/00—Modifying the chemical composition of combustible gases containing carbon monoxide to produce an improved fuel, e.g. one of different calorific value, which may be free from carbon monoxide
    • C10K3/02—Modifying the chemical composition of combustible gases containing carbon monoxide to produce an improved fuel, e.g. one of different calorific value, which may be free from carbon monoxide by catalytic treatment
    • C10K3/026—Increasing the carbon monoxide content, e.g. reverse water-gas shift [RWGS]
    • 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
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/20—Increasing the gas reduction potential of recycled exhaust gases
    • C21B2100/28—Increasing the gas reduction potential of recycled exhaust gases by separation
    • C21B2100/282—Increasing the gas reduction potential of recycled exhaust gases by separation of carbon dioxide
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C2100/00—Exhaust gas
    • C21C2100/02—Treatment of the exhaust gas
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C2100/00—Exhaust gas
    • C21C2100/04—Recirculation of the exhaust gas
    • 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
    • Y02P10/122—Reduction of greenhouse gas [GHG] emissions by capturing or storing CO2
    • 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
    • Y02P10/134—Reduction of greenhouse gas [GHG] emissions by avoiding CO2, e.g. using hydrogen

Definitions

  • the invention relates to a method for recycling the outlet gas of a direct reduction process of gas as a reducing gas, in particular to a method for recycling C0 2 in an outlet gas by using a gas as a reducing gas direct reduction process.
  • Direct reduction process systems typically include a gas production system, a gas treatment system, and a direct reduction unit.
  • the reduced gas produced in the gas preparation system by the high carbon carrier is used to process the gas into the gas treatment system, and the treated gas enters the direct reduction device to produce direct reduced iron.
  • a method for recycling the outlet gas by direct reduction of gas as a reducing gas characterized in that: the outlet gas of the direct reduction device is treated by the direct gas reduction system of the direct reduction device; Entering the carbon dioxide separation system for decarbonization Enriched desorbed C0 2 and CO + H 2 gas decarburization, wherein the C0 2 rich-enriched desorbed C0 2 stripping gas processing system for processing, sent back to the gas preparation system, or as a direct reduced iron, carbon
  • the carrier or dust delivery carrier is returned to the gas preparation system.
  • the C0 2 rich stripping gas, the corresponding pressure and / or temperature shift C0 2 rich stripping gas in a processing system to meet the pressure and temperature requirements of the gas inlet system is prepared, and then sent back directly to the gas preparation system , or as a transport carrier for direct reduced iron, high carbon carrier or dust, returned to the gas preparation system.
  • the gas treated by the direct reduction unit outlet gas treatment system is partially introduced into the carbon dioxide separation system for decarburization treatment, or all of it enters the carbon dioxide separation system for decarburization treatment.
  • the C0 2 rich stripping gas, C0 2 rich stripping gas processing system through the entire post-processing gas into the preparation system, or part of co 2-enriched desorbed gas aftertreatment system for processing into the gas preparation system.
  • the gas treatment in the direct reduction unit outlet gas treatment system includes: dust removal and/or cooling and/or pressure conversion.
  • the C0 2 desorbed gas can be subjected to pressure and/or temperature conversion after purification, removal of impurities or blending of other gas in the C0 2 desorption gas treatment system.
  • the gas treatment system comprises a gas heat exchange device, a gas dust removal device, a gas desulfurization device, a gas residual pressure recovery device and a gas heating device; and the CO+H 2 decarburized gas is returned to the heating device in the gas treatment system before and after being treated After the gas mixture is heated, it enters the direct reduction unit.
  • part of the gas can be reused as C0 2 produced in the direct reduction process of the reducing gas, and the purpose of saving coal consumption is achieved while reducing C0 2 .
  • the process of the present invention is to reuse C0 2 in the direct reduction process of gas as a reducing gas to achieve the purpose of reducing emissions and saving coal. From the above technical solutions, the present invention has the following beneficial effects:
  • the N 2 dosage for the pneumatic conveying medium can be omitted; in addition, the desorption gas can be significantly reduced as the pneumatic conveying medium.
  • the content of inert gas (mainly N 2 ) in the gas output from the gas preparation system is of great significance for improving the quality of the reducing gas throughout the process.
  • FIG. 1 is a flow chart of a method of the present invention.
  • the entire process includes six process systems, namely: 1) gas preparation system; 2) gas treatment system; 3) direct reduction device; 4) direct Reduction unit gas treatment system; 5) Carbon dioxide separation system; 6) C0 2 desorption gas treatment system.
  • the above six process systems are connected together by a conveying pipe and a conveying device to achieve the purpose of direct reduction of the gas as a reducing gas and reduction of the C0 2 reduction process.
  • the percentage of the gas component to which the present invention relates is the volume percentage of the dry gas component unless otherwise specified.
  • Gas preparation system Coal, pure oxygen, water or water vapor and C0 2 desorbed gas desorbed from the direct reduction unit outlet gas react in the gas preparation system to produce CO+H 2 80% reduction gas
  • the reduction gas temperature is in the range of 1000 ⁇ 1700 °C
  • the pressure is 0.4 ⁇ 8.5Mpa
  • the gas state point of the gas preparation system is 1 point as shown in the drawing.
  • the gas preparation system may be a high temperature and high pressure gas flow bed, a molten direct gas reduction smelting gasification furnace, etc.
  • the direct reduction device may be a shaft furnace, a fluidized bed, a rotary kiln, a rotary hearth furnace, and the like.
  • the reducing gas produced by the gas preparation system is composed of a high carbon carrier and 0 2 , or 0 2 + 3 ⁇ 40, or 0 2 + H 2 0+C0 2 , or 0 2 + C0 2 in a high temperature and high pressure gas flow bed or a fluidized bed.
  • reaction CO + H 2 rich reducing gas, or by a carbon support and direct reduced iron + 02 or 02 + + produce direct reduced iron while generating iron ore in the melter-gasifier enriched CO + H 2 reducing gas. It is of course also possible to produce a reducing gas according to other preparation methods.
  • Gas treatment system The outlet gas of the gas preparation system is cooled by the coarse dust collector in the gas treatment system and then enters the gas heat exchange device (such as waste heat boiler) to cool down to the temperature required by the gas dust removal device (such as dry dust removal device).
  • the dust removal method adopts a dry bag filter, and the dust content of the gas after dust removal by dry bag is ⁇ 5mg/m3; the gas after dust removal passes through the gas desulfurization device, and the sulfur removal method removes H 2 S and COS from the gas.
  • the gas heat exchange device After that, it is reheated to a certain temperature (245 ° C) by the gas heat exchange device, and then enters the gas residual pressure recovery device (TRT) for pressure recovery, and the pressure is lowered to be slightly higher than the inlet gas pressure of the direct reduction device.
  • TRT gas residual pressure recovery device
  • Direct reduction device The gas from the gas preparation system treated in the above 2) is mixed with the CO + H 2 decarbonized gas after the carbon dioxide separation system, and the mixed gas CO + H 2 85% (wet gas)
  • the mixed gas needs to be heated before entering the direct reduction device, and the heating method may be heating the hot air furnace, or
  • the direct reduction device may be a shaft furnace, a fluidized bed, a rotary kiln, a rotary hearth furnace, or the like, which can directly reduce iron ore into direct reduced iron by using reducing gas, and the state is as shown in Fig. 2 .
  • Direct reduction unit outlet gas (3 points) in the direct reduction unit outlet gas treatment system is as follows: first through the coarse dust collector and then into the gas heat exchanger (such as heat pipe heat exchanger) The temperature is lowered to the temperature required for the gas dry dust removal device.
  • the dry dust removal method uses a dry bag filter. The dust content of the gas after the dust removal by the dry bag is 5 mg/m3. The gas after the dust removal is transformed by the gas pressure conversion device.
  • the gas pressure after the gas pressure is required to be within the inlet pressure requirement of the carbon dioxide separation system, and the decarburization gas pressure after decarbonization by the carbon dioxide separation system is slightly higher than the inlet gas pressure of the direct reduction device; the gas after the gas pressure conversion device is based on the gas
  • the temperature is, if necessary, cooled down to the inlet temperature requirement of the CO2 separation system. Its status point is shown in Figure 4 of the figure.
  • Carbon dioxide separation system A part of the gas after the direct reduction device is exported to the gas treatment system for output, and another part enters the carbon dioxide separation system for decarburization, and the decarburized CO+H 2 decarbonized gas (5 points) is refluxed directly to Before the device is restored, the specific process is as described in 3) above;
  • C0 2 desorption gas treatment system decarburized C0 2 desorbed gas (6 points) is subjected to pressure and/or temperature conversion of the C0 2 desorption gas treatment system to meet the inlet pressure and temperature of the gas preparation system.
  • C element in C0 2 .
  • the decarburization-rich C0 2 desorbed gas can be treated in a rich C0 2 desorption gas treatment system by first purifying, removing impurities or blending other gas, and the like. Perform pressure and temperature changes. This falls within the scope of protection of the present invention.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • General Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Manufacture Of Iron (AREA)

Abstract

L'invention porte sur un procédé de réutilisation de gaz de houille effluent, comme gaz réducteur dans un procédé de réduction directe, qui comporte le procédé de traitement suivant : après avoir été traité par un système (115) de traitement de gaz de houille effluent d'un dispositif de réduction directe, le gaz de houille effluent du dispositif de réduction directe (105) entre dans un système de séparation (113) du dioxyde de carbone pour obtenir du gaz désorbé riche en dioxyde de carbone et du gaz décarburé (112) riche en monoxyde de carbone et en hydrogène, le gaz désorbé riche en dioxyde de carbone, après avoir été traité par un système de traitement (111) de gaz désorbé riche en dioxyde de carbone, retournant vers le système de préparation (101) de gaz de houille, ou plutôt retournant vers le système de préparation (101) de gaz de houille sous forme d'un vecteur de transport de fer ayant subi une réduction directe, de vecteur à teneur élevée en carbone ou de poussière. Le procédé permet de réduire l'émission de dioxyde de carbone et la consommation de charbon.
PCT/CN2010/075407 2009-08-14 2010-07-22 Procédé de réutilisation de gaz de houille effluent comme gaz réducteur dans un procédé de réduction directe WO2011017995A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2009101046336A CN101638702B (zh) 2009-08-14 2009-08-14 一种煤气作还原气的直接还原工艺出口煤气的回用方法
CN200910104633.6 2009-08-14

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Cited By (1)

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CN104673954A (zh) * 2015-02-13 2015-06-03 湖南长拓高科冶金有限公司 含铁矿粉的直接还原炼铁方法及系统

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CN101638702B (zh) * 2009-08-14 2011-07-20 中冶赛迪工程技术股份有限公司 一种煤气作还原气的直接还原工艺出口煤气的回用方法
AT510177B1 (de) 2010-07-20 2012-05-15 Siemens Vai Metals Tech Gmbh Verfahren zur reinigung eines mit stäuben beladenen gasstroms
CN101928799A (zh) * 2010-08-10 2010-12-29 中冶赛迪工程技术股份有限公司 一种利用Finex工艺输出煤气生产海绵铁的工艺
CN102382915A (zh) * 2010-08-30 2012-03-21 上海国冶工程技术有限公司 使用二氧化碳作传输介质进行高炉喷煤的方法
CN102758038A (zh) * 2012-07-30 2012-10-31 中冶南方工程技术有限公司 全热氧高炉与竖炉联合生产系统
ES2689779T3 (es) * 2012-09-14 2018-11-15 Voestalpine Stahl Gmbh Procedimiento para producir acero con energía renovable
CN103898265B (zh) * 2014-03-12 2015-08-12 江苏科技大学 一种焦炉煤气改质直接还原铁矿石系统装置及方法
CN106433798B (zh) * 2016-09-19 2019-06-04 石家庄新华能源环保科技股份有限公司 一种氢电能源系统
CN109813129B (zh) * 2019-01-04 2019-11-12 北京科技大学 一种基于尾气循环o2-co2助燃的球团生产工艺及制备系统
CN114574650A (zh) * 2022-03-14 2022-06-03 中冶赛迪工程技术股份有限公司 一种氢基竖炉生产直接还原铁的方法及装置

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