US20090095134A1 - Process and Equipment for Blast Furnace Ironmaking Using Pure Oxygen and Gas - Google Patents

Process and Equipment for Blast Furnace Ironmaking Using Pure Oxygen and Gas Download PDF

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Publication number
US20090095134A1
US20090095134A1 US12/226,940 US22694006A US2009095134A1 US 20090095134 A1 US20090095134 A1 US 20090095134A1 US 22694006 A US22694006 A US 22694006A US 2009095134 A1 US2009095134 A1 US 2009095134A1
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gas
furnace
oxygen
ton
blast furnace
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US12/226,940
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Jiule Zhou
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/06—Making pig-iron in the blast furnace using top gas in the blast furnace process
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/001—Injecting additional fuel or reducing agents
    • 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
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
    • C21B2100/44—Removing particles, e.g. by scrubbing, dedusting
    • 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
    • C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
    • C21B2100/62—Energy conversion other than by heat exchange, e.g. by use of exhaust gas in energy production
    • 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
    • C21C2100/06—Energy from waste gas used in other processes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/16—Sintering; Agglomerating
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B5/00—General methods of reducing to metals
    • C22B5/02—Dry methods smelting of sulfides or formation of mattes
    • C22B5/12—Dry methods smelting of sulfides or formation of mattes by gases
    • 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
    • Y02P10/20—Recycling
    • 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
    • Y02P10/25—Process efficiency

Definitions

  • the present invention relates to a process of blast furnace ironmaking in iron and steel metallurgy industry, and more particularly to an ironmaking process that replaces blast furnace blasting with pure oxygen, and replaces most of the coke with blasting preheated gas containing hydrogen.
  • An object of the present invention is to provide a process and equipment for blast furnace ironmaking using pure oxygen and gas, which modifies the traditional blast furnace ironmaking process and equipment.
  • the present invention provides a process for blast furnace ironmaking using pure oxygen and gas includes the following processes:
  • An equipment for blast furnace ironmaking using pure oxygen and gas comprises a feeding device, a blast furnace, a gravity dust collector, a ceramic tube type dust collector, a bag dust collector, a carbon dioxide pressure swing absorption device, and a residual pressure power generation device, wherein the blast furnace comprises a plurality of gas ejecting nozzle members and oxygen ejecting nozzle members provided at the periphery of the bosh thereof, and a ball type hot blast stove for preheating gas provided outside the blast furnace, wherein the ball type hot blast stove is communicated with the plurality of gas ejecting nozzle members provided at the periphery of the bosh of the blast furnace via tubes; a gas explosion-proof safety device is mounted on the tube at an outlet terminal of the ball type hot blast stove; the plurality of oxygen ejecting nozzle members provided at the bosh of the blast furnace are communicated with oxygen source via tubes.
  • the gas produced in the reaction of the present invention is purified and cooled through a gravity dust collector, a ceramic tube type dust collector, a bag dust collector and a carbon dioxide pressure swing absorption device, and the purified and cooled furnace top gas is transmitted into a residual pressure power generation device via tubes to be reused and is recovered into a gas cylinder or recycled for use.
  • the blast furnace productivity is tremendously increased.
  • the blast furnace productivity is up to 6-8 ton iron/m 3 *D
  • the solvent consumption is reduced by two-thirds
  • the slag amount is reduced by two-thirds
  • the comprehensive consumption of iron of each ton is up to 492 kgCE/t
  • the furnace top gas can be recycled to generate power.
  • FIG. 1 is a system diagram of an equipment of the present invention.
  • the gas produced in the reaction is purified and cooled through a gravity dust collector, a ceramic tube type dust collector, a bag dust collector and a carbon dioxide pressure swing absorption device, and the purified and cooled furnace top gas is transmitted into a residual pressure power generation device via tubes to be reused and is recovered into a gas cylinder or recycled for use.
  • An equipment for blast furnace ironmaking using pure oxygen and gas comprises a feeding device 1 , a blast furnace 2 , a gravity dust collector 4 , a ceramic tube type dust collector 5 , a bag dust collector 6 , a carbon dioxide pressure swing absorption device 7 , and a residual pressure power generation device 8 , wherein the blast furnace 2 comprises a plurality of gas ejecting nozzle members and oxygen ejecting nozzle members provided at the upper and lower side of the bosh thereof, and comprises a gas coiled tube 9 and an oxygen coiled tube 3 provided at the periphery of the both thereof, wherein a plurality of gas ejecting nozzle members have a plurality of branch tubes respectively that communicate with the gas coiled tube 9 , and a plurality of oxygen ejecting nozzle members have a plurality of branch tubes respectively that communicate with the oxygen coiled tube 3 .
  • a ball type hot blast stove 11 for preheating gas is provided outside the blast furnace 2 , wherein the ball type hot blast stove 11 is communicated with the gas coiled tube 9 via a gas tube 12 , and a gas explosion-proof safety device 10 is mounted on the gas tube 12 .
  • the gas produced in the reaction is purified and cooled through a gravity dust collector, a ceramic tube type dust collector, a bag dust collector and a carbon dioxide pressure swing absorption device, and the purified and cooled furnace top gas is transmitted into a residual pressure power generation device via tubes to be reused and is recovered into a gas cylinder or recycled for use.
  • the gas produced in the reaction is purified and cooled through a gravity dust collector, a ceramic tube type dust collector, a bag dust collector and a carbon dioxide pressure swing absorption device, and the purified and cooled furnace top gas is transmitted into a residual pressure power generation device via tubes to be reused and is recovered into a gas cylinder or recycled for use.

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

Abstract

Process and equipment for blast furnace ironmaking using pure oxygen and gas The process for blast furnace ironmaking using pure oxygen and gas includes putting a mineral aggregate consisting of pellet, alkaline sinter, coke and solvent into the furnace from the furnace top, wherein each ton of iron is assigned with coke of 170-200 kg; blasting pure oxygen into the furnace, wherein each ton of molten iron is blasted with oxygen of 120-200 Nm3, and ejecting gas that is pressured and preheated by the ball type hot blast stove into the furnace so as to directly reducing pellet and iron-containing material, wherein the gas is preheated to a temperature raging from 900° C. to 1150° C. and to a pressured up to 0.1-0.6 MPa; purifying and cooling the gas produced in the reducing reaction, and transmitting the gas into a residual pressure power generation device via tubes to be reused and is recovered into a gas cylinder or recycled for use. By using the above process of the present invention, the blast furnace productivity is tremendously increased. The blast furnace productivity is up to 6-8 ton iron/m3*D, the solvent consumption is reduced by two-thirds, the slag amount is reduced by two-thirds, the comprehensive consumption of iron of each ton is up to 492 kgCE/t, and the furnace top gas can be recycled to generate power.

Description

    BACKGROUND OF THE PRESENT INVENTION
  • 1. Field of Invention
  • The present invention relates to a process of blast furnace ironmaking in iron and steel metallurgy industry, and more particularly to an ironmaking process that replaces blast furnace blasting with pure oxygen, and replaces most of the coke with blasting preheated gas containing hydrogen.
  • 2. Description of Related Arts
  • At present, three-quarters pig iron and molten iron for steelmaking is produced by traditional blast furnace ironmaking process. The recent traditional blast furnace ironmaking process has been highly developed due to the use of new technology such as high oxygen, coal injection, large-scale and so on.
  • Due to the development of pure water-gas technique as disclosed in China patent CN 200610045968.1 and reforming technique of gas, coke oven gas and natural gas, the industrial process for producing high quality, high purity, high hydrogen and low cost reducing gas has been mature, so that the blast furnace ironmaking process using pure oxygen and the above mentioned gas as primary reducing matter can be realized.
  • The process and equipment for blast furnace ironmaking using pure oxygen and gas that takes gas as a reducing matter and replaces preheated blast with pure oxygen, has not been found after a thorough search.
    • SUMMARY OF THE PRESENT INVENTION
  • An object of the present invention is to provide a process and equipment for blast furnace ironmaking using pure oxygen and gas, which modifies the traditional blast furnace ironmaking process and equipment.
  • Accordingly, in order to accomplish the above object, the present invention provides a process for blast furnace ironmaking using pure oxygen and gas includes the following processes:
  • 1. Put a mineral aggregate consisting of pellet, alkaline sinter, coke and solvent into the furnace from the furnace top, wherein each ton of iron is assigned with coke of 170-200 kg;
  • 2. Blast pure oxygen into the furnace, wherein each ton of molten iron is blasted with oxygen of 120-200 Nm3, and eject gas that is pressured and preheated by the ball type hot blast stove into the furnace so as to directly reducing pellet and iron-containing material, wherein the gas is preheated to a temperature raging from 900° C. to 1150° C. and to a pressured up to 0.1-0.6 MPa;
  • 3. Purify and cool the gas produced in the reducing reaction, and transmit the gas into a residual pressure power generation device via tubes to be reused and is recovered into a gas cylinder or recycled for use.
  • An equipment for blast furnace ironmaking using pure oxygen and gas comprises a feeding device, a blast furnace, a gravity dust collector, a ceramic tube type dust collector, a bag dust collector, a carbon dioxide pressure swing absorption device, and a residual pressure power generation device, wherein the blast furnace comprises a plurality of gas ejecting nozzle members and oxygen ejecting nozzle members provided at the periphery of the bosh thereof, and a ball type hot blast stove for preheating gas provided outside the blast furnace, wherein the ball type hot blast stove is communicated with the plurality of gas ejecting nozzle members provided at the periphery of the bosh of the blast furnace via tubes; a gas explosion-proof safety device is mounted on the tube at an outlet terminal of the ball type hot blast stove; the plurality of oxygen ejecting nozzle members provided at the bosh of the blast furnace are communicated with oxygen source via tubes.
  • The gas produced in the reaction of the present invention is purified and cooled through a gravity dust collector, a ceramic tube type dust collector, a bag dust collector and a carbon dioxide pressure swing absorption device, and the purified and cooled furnace top gas is transmitted into a residual pressure power generation device via tubes to be reused and is recovered into a gas cylinder or recycled for use.
  • By using the above process of the present invention, the blast furnace productivity is tremendously increased. The blast furnace productivity is up to 6-8 ton iron/m3*D, the solvent consumption is reduced by two-thirds, the slag amount is reduced by two-thirds, the comprehensive consumption of iron of each ton is up to 492 kgCE/t, and the furnace top gas can be recycled to generate power.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a system diagram of an equipment of the present invention.
    •  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Example I
  • A process for blast furnace ironmaking using pure oxygen and gas:
  • Put pellet, alkaline sinter, coke and solvent into the furnace from the furnace top, wherein each ton of iron is assigned with 180 kg coke; then blast pure oxygen into the furnace, and at the same time eject gas that is pressured and preheated by the ball type hot blast stove into the furnace so as to directly reducing pellet and iron-containing material, wherein each ton of molten iron is blasted with 130 Nm3 oxygen, and the gas is preheated and pressured up to 1000° C.-1100° C. and 0.2 MPa respectively. The gas produced in the reaction is purified and cooled through a gravity dust collector, a ceramic tube type dust collector, a bag dust collector and a carbon dioxide pressure swing absorption device, and the purified and cooled furnace top gas is transmitted into a residual pressure power generation device via tubes to be reused and is recovered into a gas cylinder or recycled for use.
  • An equipment for blast furnace ironmaking using pure oxygen and gas comprises a feeding device 1, a blast furnace 2, a gravity dust collector 4, a ceramic tube type dust collector 5, a bag dust collector 6, a carbon dioxide pressure swing absorption device 7, and a residual pressure power generation device 8, wherein the blast furnace 2 comprises a plurality of gas ejecting nozzle members and oxygen ejecting nozzle members provided at the upper and lower side of the bosh thereof, and comprises a gas coiled tube 9 and an oxygen coiled tube 3 provided at the periphery of the both thereof, wherein a plurality of gas ejecting nozzle members have a plurality of branch tubes respectively that communicate with the gas coiled tube 9, and a plurality of oxygen ejecting nozzle members have a plurality of branch tubes respectively that communicate with the oxygen coiled tube 3. A ball type hot blast stove 11 for preheating gas is provided outside the blast furnace 2, wherein the ball type hot blast stove 11 is communicated with the gas coiled tube 9 via a gas tube 12, and a gas explosion-proof safety device 10 is mounted on the gas tube 12.
    • Example II
  • A process for blast furnace ironmaking using pure oxygen and gas:
  • Put pellet, alkaline sinter, coke and solvent into the furnace from the furnace top, wherein each ton of iron is assigned with 190 kg coke; then blast pure oxygen into the furnace, and at the same time eject gas that is pressured and preheated by the ball type hot blast stove into the furnace so as to directly reducing pellet and iron-containing material, wherein each ton of molten iron is blasted with 160 Nm3 oxygen, and the gas is preheated and pressured up to 1000° C.-1100° C. and 0.3 MPa respectively. The gas produced in the reaction is purified and cooled through a gravity dust collector, a ceramic tube type dust collector, a bag dust collector and a carbon dioxide pressure swing absorption device, and the purified and cooled furnace top gas is transmitted into a residual pressure power generation device via tubes to be reused and is recovered into a gas cylinder or recycled for use.
    • Example III
  • A process for blast furnace ironmaking using pure oxygen and gas:
  • Put pellet, alkaline sinter, coke and solvent into the furnace from the furnace top, wherein each ton of iron is assigned with 200 kg coke; then blast pure oxygen into the furnace, and at the same time eject gas that is pressured and preheated by the ball type hot blast stove into the furnace so as to directly reducing pellet and iron-containing material, wherein each ton of molten iron is blasted with 190 Nm3 oxygen, and the gas is preheated and pressured up to 1000° C.-1100° C. and 0.5 MPa respectively. The gas produced in the reaction is purified and cooled through a gravity dust collector, a ceramic tube type dust collector, a bag dust collector and a carbon dioxide pressure swing absorption device, and the purified and cooled furnace top gas is transmitted into a residual pressure power generation device via tubes to be reused and is recovered into a gas cylinder or recycled for use.

Claims (4)

1. A process for blast furnace ironmaking using pure oxygen and gas, comprising:
(a) putting a mineral aggregate consisting of pellet, alkaline sinter, coke and solvent into a furnace from a furnace top, wherein each ton of iron is assigned with coke of 170-200 kg;
(b) blasting pure oxygen into said furnace, wherein each ton of molten iron is blasted with oxygen of 120-200 Nm3, and ejecting gas that is pressured and preheated by a ball type hot blast stove into said furnace so as to directly reducing said pellet, wherein said gas is preheated to a temperature raging from 900° C. to 1150° C. and to a pressured up to 0.1-0.6 MPa; and
(c) purifying and cooling said gas produced in reducing reaction, and transmitting said gas into a residual pressure power generation device via tubes for being reused and is recovered into a gas cylinder or recycled for use.
2. An equipment for blast furnace ironmaking using pure oxygen and gas, comprising: a feeding device, a blast furnace, a gravity dust collector, a ceramic tube type dust collector, a bag dust collector, a carbon dioxide pressure swing absorption device, and a residual pressure power generation device, wherein said blast furnace comprises a plurality of gas ejecting nozzle members and oxygen ejecting nozzle members provided at a periphery of a bosh thereof, and a ball type hot blast stove for preheating gas provided outside said blast furnace, wherein said ball type hot blast stove is communicated with said plurality of gas ejecting nozzle members provided at said periphery of said bosh of said blast furnace via tubes; a gas explosion-proof safety device is mounted on a tube at an outlet terminal of said ball type hot blast stove; said plurality of oxygen ejecting nozzle members provided at said bosh of said blast furnace are communicated with oxygen source via tubes.
3. The process for blast furnace ironmaking using pure oxygen and gas as recited in claim 1, wherein put said mineral aggregate consisting of pellet, alkaline sinter, coke and solvent into said furnace from said furnace top, wherein each ton of iron is assigned with coke of 190 kg; blast pure oxygen into said furnace, wherein each ton of molten iron is blasted with oxygen of 160 Nm3, and eject gas that is pressured and preheated by said ball type hot blast stove into said furnace so as to directly reducing said pellet, wherein said gas is preheated to a temperature raging from 1000° C. to 1100° C. and to a pressured up to 0.3 MPa; and purify and cool said gas produced in reducing reaction, and transmit said gas into said residual pressure power generation device via tubes for being reused and is recovered into said gas cylinder or recycled for use.
4. The process for blast furnace ironmaking using pure oxygen and gas as recited in claim 1, wherein put said mineral aggregate consisting of pellet, alkaline sinter, coke and solvent into said furnace from said furnace top, wherein each ton of iron is assigned with coke of 200 kg; blast pure oxygen into said furnace, wherein each ton of molten iron is blasted with oxygen of 190 Nm3, and eject gas that is pressured and preheated by said ball type hot blast stove into said furnace so as to directly reducing said pellet, wherein said gas is preheated to a temperature raging from 1000° C. to 1100° C. and to a pressured up to 0.5 MPa; and purify and cool said gas produced in reducing reaction, and transmit said gas into said residual pressure power generation device via tubes for being reused and is recovered into said gas cylinder or recycled for use.
US12/226,940 2006-09-12 2006-12-05 Process and Equipment for Blast Furnace Ironmaking Using Pure Oxygen and Gas Abandoned US20090095134A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CNA2006100477209A CN1916187A (en) 2006-09-12 2006-09-12 Tecnique and euippment for making iron by using blast furnace through pure oxygen and coal gas
CN20061047720.9 2006-09-12
PCT/CN2006/003280 WO2008037132A1 (en) 2006-09-12 2006-12-05 A process for iron smelting in blast furnace using purified oxygen and coal gas and its device

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US20220145410A1 (en) * 2019-05-21 2022-05-12 Paul Wurth S.A. Method for operating a blast furnace

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CN101519703B (en) * 2008-02-26 2010-12-08 宝山钢铁股份有限公司 Low-coke-ratio blast furnace ironmaking technique
CN101280348A (en) * 2008-04-23 2008-10-08 沈阳东方钢铁有限公司 High-temperature coal gas blast furnace iron-smelting process
LU91543B1 (en) * 2009-03-24 2010-09-27 Wurth Paul Sa Tuyere stock arrangement for a blast furnace and method for operating a blast furnace
LU91559B1 (en) * 2009-04-28 2010-10-29 Wurth Paul Sa Method for feeding a burden to a blast furnace
JP4743332B2 (en) * 2009-04-30 2011-08-10 Ｊｆｅスチール株式会社 Blast furnace operation method
CN101792831B (en) * 2010-03-26 2011-08-31 西安陕鼓动力股份有限公司 Automatic sweeping method for nitrogen replaced with gas in blast furnace gas energy recovery system pipe network
CN101792833B (en) * 2010-03-26 2011-06-22 西安陕鼓动力股份有限公司 Automatic sweeping method for nitrogen replaced with air in blast furnace gas energy recovery system pipe network
CN101792834B (en) * 2010-03-26 2011-06-22 西安陕鼓动力股份有限公司 Automatic sweeping method for gas replaced with nitrogen in blast furnace gas energy recovery system pipe network
CN103695665B (en) * 2013-12-18 2015-04-01 中冶南方工程技术有限公司 Process for recycling zinc and producing molten iron by using iron-containing zinc dust
CN113718074A (en) * 2021-09-03 2021-11-30 中冶赛迪工程技术股份有限公司 Low-carbon blast furnace iron-making method

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US2192885A (en) * 1938-03-10 1940-03-12 Little Inc A Blast furnace power system
US3146089A (en) * 1961-03-27 1964-08-25 Exxon Research Engineering Co Optimizing reducing gas production with hydrogen-containing fuels
US4421553A (en) * 1980-05-06 1983-12-20 Centre De Recherches Metallurgiques Process for operating a blast furnace
US5582029A (en) * 1995-10-04 1996-12-10 Air Products And Chemicals, Inc. Use of nitrogen from an air separation plant in carbon dioxide removal from a feed gas to a further process
US6631754B1 (en) * 2000-03-14 2003-10-14 L'air Liquide Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude Regenerative heat exchanger and method for heating a gas therewith
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CN1916187A (en) 2007-02-21

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