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EP2956406A2 - Procédé et appareil pour séquestrer le dioxyde de carbone contenu dans un gaz usé - Google Patents

Procédé et appareil pour séquestrer le dioxyde de carbone contenu dans un gaz usé

Info

Publication number
EP2956406A2
EP2956406A2 EP13875010.4A EP13875010A EP2956406A2 EP 2956406 A2 EP2956406 A2 EP 2956406A2 EP 13875010 A EP13875010 A EP 13875010A EP 2956406 A2 EP2956406 A2 EP 2956406A2
Authority
EP
European Patent Office
Prior art keywords
gas
carbon dioxide
fuel
reformer
reducing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP13875010.4A
Other languages
German (de)
English (en)
Other versions
EP2956406A4 (fr
Inventor
Gary E. Metius
James M. Mcclelland, Jr.
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Midrex Technologies Inc
Original Assignee
Midrex Technologies Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=51354653&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2956406(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from US13/768,331 external-priority patent/US8771638B2/en
Application filed by Midrex Technologies Inc filed Critical Midrex Technologies Inc
Publication of EP2956406A2 publication Critical patent/EP2956406A2/fr
Publication of EP2956406A4 publication Critical patent/EP2956406A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/62—Carbon oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/30—Alkali metal compounds
    • B01D2251/306—Alkali metal compounds of potassium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
    • B01D2252/10—Inorganic absorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
    • B01D2252/20—Organic absorbents
    • B01D2252/204—Amines
    • B01D2252/20478—Alkanolamines
    • B01D2252/20484—Alkanolamines with one hydroxyl group
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
    • B01D2252/20—Organic absorbents
    • B01D2252/204—Amines
    • B01D2252/20478—Alkanolamines
    • B01D2252/20489—Alkanolamines with two or more hydroxyl groups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/50—Carbon oxides
    • B01D2257/504—Carbon dioxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/025—Other waste gases from metallurgy plants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B01D53/047—Pressure swing adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B01D53/047—Pressure swing adsorption
    • B01D53/0476—Vacuum pressure swing adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1456—Removing acid components
    • B01D53/1475—Removing carbon dioxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
    • 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
    • C21B2100/22—Increasing the gas reduction potential of recycled exhaust gases by reforming
    • 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
    • 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
    • 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
    • C21B2100/64—Controlling the physical properties of the gas, e.g. pressure or temperature
    • 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
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/40—Capture or disposal of greenhouse gases of 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
    • Y02P10/122—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 present invention relates generally to a method and apparatus for the direct reduction of iron oxide to metallic iron, among other processes. More specifically, the present invention relates to a method and apparatus for sequestering carbon dioxide from a spent gas in association with such processes.
  • government policy has required such carbon dioxide removal, and the need for carbon dioxide emissions control will only increase in the future.
  • Direct reduction involves the reduction of iron oxide ores into metalized iron pellets, lumps, or compacts, where the iron oxide is reduced by a gas containing hydrogen and/or carbon monoxide, resulting in a carbon dioxide byproduct.
  • a method for sequestering carbon dioxide from a top gas fuel includes: given a top gas divided into a process gas and a top gas fuel: mixing the process gas with a hydrocarbon and feeding a resulting reformer feed gas into a carbon dioxide and steam reformer for reforming the reformer feed gas and forming a reducing gas; and feeding the top gas fuel into a carbon dioxide scrubber for removing at least some carbon dioxide from the top gas fuel and forming a reformer fuel gas after the addition of a hydrocarbon that is fed into the carbon dioxide and steam reformer.
  • the method also includes compressing the process gas and the top gas fuel.
  • the method further includes generating steam from the top gas.
  • the method still further includes scrubbing the top gas to remove dust.
  • the top gas is obtained from a reduction furnace.
  • the method still further includes mixing the reducing gas with oxygen and a hydrocarbon to form a bustle gas and feeding the bustle gas into the reduction furnace.
  • the carbon dioxide scrubber also produces carbon dioxide lean gas.
  • the method still further includes mixing the carbon dioxide lean gas with the reducing gas.
  • the method still further includes preheating the carbon dioxide lean gas before mixing it with the reducing gas or using it as fuel.
  • the carbon dioxide and steam reformer also produces flue gas.
  • the method still further includes generating steam from the flue gas.
  • the method still further includes using the flue gas to preheat another gas.
  • the top gas and the bustle gas are associated with a direct reduction process for converting iron oxide to metallic iron.
  • an apparatus for sequestering carbon dioxide from a top gas fuel includes: one or more conduits for dividing a top gas into a process gas and a top gas fuel; one or more conduits for mixing the process gas with a hydrocarbon and feeding a resulting reformer feed gas into a carbon dioxide and steam reformer for reforming the reformer feed gas and forming a reducing gas; and one or more conduits for feeding the top gas fuel into a carbon dioxide scrubber for removing at least some carbon dioxide from the top gas fuel and forming a reformer fuel gas after the addition of a hydrocarbon that is fed into the carbon dioxide and steam reformer.
  • the apparatus also includes one or more gas compressors for compressing the process gas and the top gas fuel.
  • the apparatus further includes a low-pressure steam boiler for generating steam from the top gas.
  • the apparatus still further includes a wet scrubber for scrubbing the top gas to remove dust.
  • the top gas is obtained from a reduction furnace.
  • the apparatus still further includes one or more conduits for mixing the reducing gas with oxygen and a hydrocarbon to form a bustle gas and feeding the bustle gas into the reduction furnace.
  • the carbon dioxide scrubber also produces carbon dioxide lean gas.
  • the apparatus still further includes one or more conduits for mixing the carbon dioxide lean gas with the reducing gas.
  • the apparatus still further includes a preheater for preheating the carbon dioxide lean gas before mixing it with the reducing gas or using it as fuel.
  • the carbon dioxide and steam reformer also produces flue gas.
  • the apparatus still further includes a low- pressure steam boiler for generating steam from the flue gas.
  • the apparatus still further includes one or more conduits for using the flue gas to preheat another gas.
  • the top gas and the bustle gas are associated with a direct reduction process for converting iron oxide to metallic iron.
  • a method for sequestering carbon dioxide from a waste gas and reusing it as a recycled gas without emissions concerns includes: given a gas source divided into a process gas and a waste gas: mixing the process gas with a hydrocarbon and feeding a resulting feed gas into a reformer for reforming the feed gas and forming a reducing gas; and feeding at least a portion of the waste gas into a carbon dioxide scrubber for removing at least some carbon dioxide from the waste gas and forming a carbon dioxide lean gas that is mixed with the reducing gas.
  • the method also includes feeding at least a portion of the waste gas into the carbon dioxide scrubber for removing at least some carbon dioxide from the waste gas and forming a fuel gas after the addition of a hydrocarbon that is fed into the reformer.
  • the carbon dioxide sequestration processes of the present invention provide an efficient loop by which carbon monoxide and hydrogen not used in a primary process and expelled as waste gas may be recaptured, while minimizing unwanted emissions.
  • FIG. 1 is a process/schematic diagram of the method/apparatus for sequestering carbon dioxide from a top gas fuel of the present invention.
  • FIG. 2 is a process/schematic diagram of the direct reduction process of the present invention.
  • the apparatus for sequestering carbon dioxide from a top gas fuel 10 inherently includes a vertical shaft-type reduction furnace 12 or the like.
  • the reduction furnace 12 includes a feed hopper (not illustrated) into which iron oxide pellets, lumps, or compacts are fed at a predetermined rate.
  • the iron oxide pellets, lumps, or compacts descend by gravity into the reduction furnace 12 from the feed hopper through a feed pipe (not illustrated), which also serves as a gas seal pipe.
  • a discharge pipe (not illustrated), which further serves as a gas seal pipe.
  • a discharge feeder (not illustrated), such as an electric vibrating feeder or the like, is disposed below the discharge pipe and receives the metallic iron pellets, lumps, or compacts, thereby establishing a system for the gravitational descent of the burden through the reduction furnace 12.
  • a bustle and tuyere system (not illustrated), through which the hot reducing gas is introduced at a temperature of between about 700 degrees C and about 1050 degrees C.
  • the hot reducing gas flows upwards through a reduction region of the reduction furnace 12, counter to the flow of the pellets, lumps, or compacts, and exits the reduction furnace 12 through a gas off-take pipe (not illustrated) located at the top of the reduction furnace 12.
  • the feed pipe extends below the gas off-take pipe, this geometric arrangement creating a spent gas disengaging plenum that permits spent gas to disengage from the stock line and flow freely to the gas off-take pipe.
  • the hot reducing gas in flowing from the bustle and tuyere system to the gas off-take pipe, serves to heat the iron oxide pellets, lumps, or compacts and reduce them to metallic iron pellets, lumps, or compacts (i.e. via direct reduction).
  • the hot reducing gas contains hydrogen, nitrogen, carbon monoxide, carbon dioxide, methane, and water vapor that reduce the iron oxide pellets, lumps, or compacts and produce a spent gas, or top gas, containing carbon dioxide and water vapor.
  • the reduction furnace burden acts as a large adiabatic reactor and promotes equilibrium reactions in the zone of the bustle gas injection. As the bustle gas enters the reduction furnace 12 and passes through the burden, the gas reacts to its equilibrium composition and temperature, which is observed on the burden thermocouples at the upper portion of the reduction furnace 12.
  • the initial reducing gas quality is closely controlled and becomes the primary stability factor for the direct reduction process.
  • natural gas is added based on the methane content analysis of the final bustle gas. This provides a stabilizing adjustment for any variation in the methane content of the initial reducing gas, and affects the carburizing potential of the final bustle gas.
  • Oxygen is added to the reducing gas to increase the temperature of the final bustle gas and improve the kinetics of the iron ore reduction process.
  • the operating conditions used include preheating the natural gas addition, reducing gas methane content equal to or less than about 12 percent, and oxygen addition flow/ton equal to or less than about 30 Nm /t.
  • the top gas from the gas off-take pipe of the reduction furnace 12 flows through another pipe (not illustrated) to a low-pressure steam boiler 14.
  • a low-pressure steam boiler 14 This allows for the efficient generation of steam for use elsewhere in the process, such as in the carbon dioxide removal step described in greater detail herein below.
  • Boiler feed water is fed to the low-pressure steam boiler 14 and, as alluded to herein above, the steam generated is recirculated through the process or used elsewhere.
  • the top gas is then directed to a wet scrubber 20 that is provided to cool the top gas and remove dust, with a water output.
  • the wet scrubber 20 may be of any conventional type known to those of ordinary skill in the art, such as a venturi with a packed tower (not illustrated), with the top gas flowing downwards through the venturi and then upwards through the packing counterflow to cooling water.
  • the top gas exits the wet scrubber 20 in two streams by the influence of a valve (not illustrated).
  • the first stream represents process gas and the second gas represents top gas fuel (i.e. waste).
  • the ratio of these streams is defined by the available heat in a carbon dioxide and steam reformer 24 coupled to the first stream, which is typically constant, resulting in an exemplary ratio of 1 : 1 (with the use of recycled carbon dioxide lean gas), 2: 1 (without the use of recycled carbon dioxide lean gas), etc.
  • the process gas from the wet scrubber 20 is fed to a compressor 22 and compressed to a desired pressure, and then fed to a mixer (not illustrated), where the process gas is mixed with natural gas.
  • This reformer feed gas is then fed into the carbon dioxide and steam reformer 24.
  • the carbon dioxide and steam reformer 24 includes fuel-fired burners (not illustrated), producing heated flue gas containing nitrogen, carbon dioxide, and water via combustion and a plurality of catalytic reformer tubes (not illustrated), the later of which utilize reformer feed gas and heat from the combustion to form reducing gas which is fed back into the reduction furnace 12 after the introduction of oxygen, natural gas, and carbon dioxide lean gas, resulting in bustle gas.
  • the top gas fuel from the wet scrubber 20 is also fed to a compressor 26 and compressed to a desired pressure, prior to introduction into a carbon dioxide scrubber 28.
  • the carbon dioxide scrubber 28 has an input of low-pressure steam, optionally obtained from any of the low-pressure steam boilers 14, 32 of the apparatus for sequestering carbon dioxide from a top gas fuel 10, and outputs of boiler feed water, sulfur, and carbon dioxide.
  • the boiler feed water may be input into any of the low-pressure steam boilers 14, 32 of the apparatus for sequestering carbon dioxide from a top gas fuel 10.
  • Another output of the carbon dioxide scrubber 28 is carbon dioxide lean gas, which when mixed with natural gas becomes, in part, the reformer fuel gas that is fed into the carbon dioxide and steam reformer 24.
  • the carbon dioxide scrubber 28 may include any type of alkanolamine, such as MEA, MDEA, or the like, or any type of hot potassium scrubbing system known to those of ordinary skill in the art.
  • the low-pressure steam is used to regenerate the solution used in the carbon dioxide scrubber 28, and exits as the boiler feed water.
  • the sulfur and carbon dioxide are sequestered from the top gas fuel.
  • the top gas fuel minus the sulfur and carbon dioxide exits the carbon dioxide scrubber 28 as the carbon dioxide lean gas.
  • a portion of the carbon dioxide lean gas is mixed with natural gas to form the reformer fuel gas, and is introduced into the carbon dioxide and steam reformer 24 via the fuel-fired burners.
  • the remainder of the carbon dioxide lean gas is recycled and mixed with the reducing gas, which is fed back into the reduction furnace 12 after the introduction of oxygen and natural gas, thereby forming the bustle gas.
  • later portion of the carbon dioxide lean gas, or the entire stream is introduced into a preheater 30 prior to mixing with the existing reducing gas or using it as fuel.
  • this carbon dioxide lean gas/reducing gas stream ultimately represents about 20 percent of the bustle gas supply to the reduction furnace 12, while the carbon dioxide and steam reformer reducing gas stream ultimately represents about 80 percent of the bustle gas supply to the reduction furnace 12, although other percentages are contemplated herein.
  • a flue gas off-take pipe (not illustrated) is provided on the carbon dioxide and steam reformer 24 for removing the flue gas containing nitrogen, carbon dioxide, and water after combustion.
  • the flue gas flows through one or several heat exchangers, including a low- pressure steam boiler 32. Again, this allows for the efficient generation of steam for use elsewhere in the process, such as in the carbon dioxide removal step described in greater detail herein above.
  • Boiler feed water is fed to the low-pressure steam boiler 32, optionally from the carbon dioxide scrubber 28, and, as alluded to herein above, the steam generated is recirculated through the process or used elsewhere.
  • the low-pressure steam boiler 32 may thus be coupled to the optional preheater 30.
  • the carbon dioxide scrubber 28 used may be a pressure swing adsorption (PSA) unit, a vacuum pressure swing adsorption (VPSA) unit, or a membrane separator, as circumstances dictate.
  • PSA pressure swing adsorption
  • VPSA vacuum pressure swing adsorption
  • MDEA membrane separator
  • the MDEA unit may be used without steam, and be direct fired using natural gas and/or an export fuel, providing direct heat exchange MDEA with the top gas and/or flue gas.
  • the captured carbon dioxide may be used for enhanced oil recovery, enhanced biogrowth for biofuel production, the production of iron carbonate/silicate structural bricks (Fe fines + C0 2 + ground steelmaking slag), etc.
  • the captured carbon dioxide may also be reformed and the resulting reformed gas used in the direct reduction process.
  • An Oxygen-fired reformer/heater may be used to concentrate the flue gas carbon dioxide.
  • a shift reactor may be used to convert carbon monoxide and water to carbon dioxide and H 2 , then the reformer may be fired with the H 2 to make water.
  • Flue gas carbon dioxide may be captured from concentrated flue gas. Water may be captured from the flue gas for use in arid locations.
  • a direct-fired heater may be used for reheating the lean (stripped) top gas fuel and/or process gases.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Biomedical Technology (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Manufacture Of Iron (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Processing Of Solid Wastes (AREA)
  • Hydrogen, Water And Hydrids (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Gas Separation By Absorption (AREA)

Abstract

Cette invention concerne un procédé et un appareil pour séquestrer le dioxyde de carbone contenu dans un gaz usé et le réutiliser sous forme de gaz recyclé sans problèmes d'émissions, ledit procédé comprenant : à supposer une source gazeuse divisée en un gaz de procédé et un gaz usé : mélanger le gaz de procédé avec un hydrocarbure et charger le gaz ainsi obtenu dans un reformeur pour reformer le gaz d'alimentation et obtenir un gaz réducteur; et charger au moins une partie du gaz usé dans un épurateur de dioxyde de carbone pour éliminer au moins une partie du dioxyde de carbone du gaz usé et obtenir un gaz pauvre en dioxyde de carbone qui est mélangé avec le gaz réducteur. Eventuellement, le procédé comprend également le chargement d'au moins une partie du gaz usé dans l'épurateur de dioxyde de carbone pour éliminer au moins une partie du dioxyde de carbone du gaz usé et obtenir un gaz combustible après ajout d'un hydrocarbure qui est chargé dans le reformeur. Eventuellement, la source gazeuse et le gaz réducteur sont associés à un procédé de réduction directe pour convertir l'oxyde de fer en fer métallique dans un four à réduction qui utilise le gaz réducteur, éventuellement après modification, et produit la source gazeuse.
EP13875010.4A 2013-02-15 2013-11-25 Procédé et appareil pour séquestrer le dioxyde de carbone contenu dans un gaz usé Withdrawn EP2956406A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13/768,331 US8771638B2 (en) 2009-04-20 2013-02-15 Method and apparatus for sequestering carbon dioxide from a spent gas
PCT/US2013/071559 WO2014126631A2 (fr) 2013-02-15 2013-11-25 Procédé et appareil pour séquestrer le dioxyde de carbone contenu dans un gaz usé

Publications (2)

Publication Number Publication Date
EP2956406A2 true EP2956406A2 (fr) 2015-12-23
EP2956406A4 EP2956406A4 (fr) 2016-10-12

Family

ID=51354653

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13875010.4A Withdrawn EP2956406A4 (fr) 2013-02-15 2013-11-25 Procédé et appareil pour séquestrer le dioxyde de carbone contenu dans un gaz usé

Country Status (19)

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BR112015016543A2 (pt) 2017-07-11
PE20151291A1 (es) 2015-09-12
EP2956406A4 (fr) 2016-10-12
ZA201505281B (en) 2022-08-31
AP2015008570A0 (en) 2015-07-31
EA201591241A1 (ru) 2015-12-30
EA028730B9 (ru) 2018-04-30
MA38303A1 (fr) 2016-09-30
CA2897000A1 (fr) 2014-08-21
UA115161C2 (uk) 2017-09-25
TWI576313B (zh) 2017-04-01
WO2014126631A2 (fr) 2014-08-21
AR094551A1 (es) 2015-08-12
CL2015002189A1 (es) 2015-12-11
NZ709347A (en) 2016-11-25
TW201434743A (zh) 2014-09-16
KR20150109413A (ko) 2015-10-01
WO2014126631A3 (fr) 2014-10-16
CN104995131A (zh) 2015-10-21
MY174695A (en) 2020-05-08
JP2016513004A (ja) 2016-05-12
MX2015009519A (es) 2016-02-05
EA028730B1 (ru) 2017-12-29

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