US20120304689A1 - Method for Separating a Cleaned Useful Gas From a Gas Mixture, and Device for Carrying Out Said Method - Google Patents

Method for Separating a Cleaned Useful Gas From a Gas Mixture, and Device for Carrying Out Said Method Download PDF

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US20120304689A1
US20120304689A1 US13/575,066 US201113575066A US2012304689A1 US 20120304689 A1 US20120304689 A1 US 20120304689A1 US 201113575066 A US201113575066 A US 201113575066A US 2012304689 A1 US2012304689 A1 US 2012304689A1
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carbon dioxide
gas
harmful substances
useful gas
liquid carbon
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Manfred Baldauf
Carsten Graeber
Marc Hanebuth
Gerhard Zimmermann
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Siemens AG
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Siemens AG
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Assigned to SIEMENS AKTIENGESELLSCHAFT reassignment SIEMENS AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GRAEBER, CARSTEN, BALDAUF, MANFRED, HANEBUTH, MARC, ZIMMERMANN, GERHARD
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    • 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
    • B01D53/002—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 condensation
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
    • C01B3/50—Separation of hydrogen or hydrogen containing gases from gaseous mixtures, e.g. purification
    • C01B3/506—Separation of hydrogen or hydrogen containing gases from gaseous mixtures, e.g. purification at low temperatures
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
    • C01B3/50—Separation of hydrogen or hydrogen containing gases from gaseous mixtures, e.g. purification
    • C01B3/52—Separation of hydrogen or hydrogen containing gases from gaseous mixtures, e.g. purification by contacting with liquids; Regeneration of used liquids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/0204—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the feed stream
    • F25J3/0223—H2/CO mixtures, i.e. synthesis gas; Water gas or shifted synthesis gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/0228—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream
    • F25J3/0252—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream separation of hydrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/0228—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream
    • F25J3/0261—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream separation of carbon monoxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/0228—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream
    • F25J3/0266—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream separation of carbon dioxide
    • 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
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
    • C01B2203/04—Integrated processes for the production of hydrogen or synthesis gas containing a purification step for the hydrogen or the synthesis gas
    • C01B2203/046—Purification by cryogenic separation
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
    • C01B2203/04—Integrated processes for the production of hydrogen or synthesis gas containing a purification step for the hydrogen or the synthesis gas
    • C01B2203/0465—Composition of the impurity
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
    • C01B2203/04—Integrated processes for the production of hydrogen or synthesis gas containing a purification step for the hydrogen or the synthesis gas
    • C01B2203/0465—Composition of the impurity
    • C01B2203/0475—Composition of the impurity the impurity being carbon dioxide
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
    • C01B2203/04—Integrated processes for the production of hydrogen or synthesis gas containing a purification step for the hydrogen or the synthesis gas
    • C01B2203/0465—Composition of the impurity
    • C01B2203/0485—Composition of the impurity the impurity being a sulfur compound
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/30—Processes or apparatus using other separation and/or other processing means using a washing, e.g. "scrubbing" or bubble column for purification purposes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/40—Processes or apparatus using other separation and/or other processing means using hybrid system, i.e. combining cryogenic and non-cryogenic separation techniques
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/60—Processes or apparatus using other separation and/or other processing means using adsorption on solid adsorbents, e.g. by temperature-swing adsorption [TSA] at the hot or cold end
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2210/00—Processes characterised by the type or other details of the feed stream
    • F25J2210/70—Flue or combustion exhaust gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2215/00—Processes characterised by the type or other details of the product stream
    • F25J2215/04—Recovery of liquid products
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2220/00—Processes or apparatus involving steps for the removal of impurities
    • F25J2220/80—Separating impurities from carbon dioxide, e.g. H2O or water-soluble contaminants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2235/00—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams
    • F25J2235/80—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams the fluid being carbon dioxide
    • 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
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/151—Reduction of greenhouse gas [GHG] emissions, e.g. CO2

Definitions

  • the invention relates to a method for separating cleaned useful gas from a gas mixture substantially containing carbon dioxide, at least one useful gas, and at least one harmful substance.
  • Harmful substances in the exhaust gas produced in coal-fired power stations have hitherto been separated directly in the gaseous phase.
  • hydrogen sulfide is separated with the aid of gas scrubbers. That entails ducting the gas stream through an absorber in which a liquid medium absorbs the harmful substances.
  • Liquid absorber media include aqueous alkanolamine solutions, especially aqueous methyl diethanolamine, and, for example, cold methanol, employed in the rectisol process. What, though, is disadvantageous therein is particularly that methods for gas scrubbing are associated with increased energy requirements.
  • the resulting useful gas will have been cleansed of CO 2 because of the carbon dioxide's cryogenic separation. It has, though, proved to be the case that not all harmful substances accumulate in the liquid CO 2 phase during the condensing process but, instead, that a certain residual amount of harmful substances will still be contained in the useful gas.
  • the object of the invention is therefore to disclose a method for separating cleaned useful gas from a gas mixture, which useful gas will not only have been very largely cleansed of CO 2 but will also be very largely free from harmful substances.
  • the inventive method thus likewise provides for the carbon dioxide to be cryogenically condensed out of the gas mixture requiring to be cleaned, after which the liquid carbon dioxide laden with harmful substances will be cleansed of the harmful substances contained therein by means of an adsorption device so that liquid carbon dioxide that is at least largely free from harmful substances will appear at the end of the adsorption process.
  • a part of said cleaned liquid carbon dioxide is then inventively fed back and ducted to the useful gas again.
  • An advantageous result of that repeated mixing of the useful gas with the liquid carbon dioxide is that the residual harmful substances contained in the useful gas will then accumulate in the liquid carbon dioxide which, owing particularly to the cleaning process, is to a large extent unsaturated.
  • the liquid carbon dioxide is then fed to the or another adsorption device again in order also to remove the harmful substances taken up as part of the repeated “reaction” with the useful gas from said liquid carbon-dioxide component.
  • the liquid carbon dioxide is used twice within the scope of the inventive method as an absorber medium for harmful substances contained in the gas mixture.
  • harmful substances are absorbed within the scope of the carbon dioxide's liquefaction, so while it is being taken to the liquid phase through cooling by means of a suitable carbon-dioxide-condensing device.
  • the still liquid carbon dioxide is used as a washing agent within the scope of the liquid carbon-dioxide component's being fed back to the useful gas in order to absorb the harmful-substance residues from the useful gas. That means the liquid carbon dioxide that is fed back is used as, so to speak, a “liquid gas-washing agent”.
  • the inventive method consequently furnishes two separate, cleaned phases, namely on the one hand the useful gas free from carbon dioxide and harmful substances and, on the other hand, the liquid carbon dioxide free from harmful substances.
  • a particularly advantageous development of the invention provides, when it has been fed back, for the liquid carbon dioxide to be injected or sprayed into the useful gas.
  • the surface of the liquid carbon dioxide will be extremely enlarged through being thus nebulized so that a large exchanging surface will be produced between the gas phase, meaning the useful gas, and the liquid phase, meaning the liquid CO 2 droplets.
  • the result is a very high absorption rate for the residual harmful substances in the useful gas, which substances can consequently be virtually completely absorbed and removed.
  • the work method will be a particularly efficient one if separating of the liquid carbon dioxide laden with harmful substances and the second process of adsorbing harmful substances by way of the cleaned liquid carbon dioxide that is fed back take place in the same container used for phase separating and the absorption of harmful substances, for example a column or flash container, or suchlike That means that on the one hand, alongside useful gas the carbon dioxide that has been condensed out and is laden with harmful substances is put into the column, where phase separating, which is to say the separating of useful gas and liquid carbon dioxide-phase, takes place, and that, on the other hand, the cleaned liquid carbon dioxide that has been fed back is also preferably injected or sprayed into the column in order to clean the useful gas completely.
  • phase separating which is to say the separating of useful gas and liquid carbon dioxide-phase
  • the useful gas that is separated can be any useful gas whose occurrence depends on the fossil fuel being burned. Examples are hydrogen, carbon monoxide, nitrogen, an inert gas, or a mixture of the cited gases.
  • the harmful substances occurring can also vary in nature depending on the specific fossil fuel used. Harmful substances that frequently occur are sulfur and mercury and their compounds, or mixtures of the cited substances.
  • the invention relates also to a device for separating cleaned useful gas from a gas mixture substantially containing carbon dioxide, at least one useful gas, and at least one harmful substance.
  • the inventive device comprises at least one carbon-dioxide-condensing device, at least one container in which phase separating and the absorbing of harmful substances takes place, for example a column or flash container, or suchlike, for separating the useful gas from the liquid carbon dioxide laden with harmful substances, at least one adsorption device for taking up the harmful substances contained in the separated liquid carbon dioxide, and a feedback line for feeding back a part of the cleaned liquid carbon dioxide, preferably into the column, for taking up residual harmful substances contained in the useful gas.
  • a device of such kind can be integrated in, for example, a power station or any industrial plant and used there for gas cleaning.
  • the gas mixture that arises is all fed to the carbon-dioxide-condensing device, possibly after being subjected to a suitable pre-treatment.
  • CO 2 condensing takes place in the carbon-dioxide-condensing device.
  • the mixture of useful gas and liquid carbon dioxide is then fed to a container 4 that is suitable for gas/liquid separating and in which phase separating takes place.
  • the liquid carbon dioxide laden with harmful substances that is removed from the column is then fed to the adsorption device for separating the harmful substances off by adsorption.
  • the cleaned liquid carbon dioxide taken from the adsorption device is then in part fed back over a feedback line and brought into contact again with the useful gas already separated from the liquid carbon dioxide in order to remove the residual harmful substances from said gas.
  • the feedback line can therein be ducted directly into the container, meaning that the carbon dioxide that has been fed back is again conveyed into the container to the region already containing the separated useful gas where “useful-gas washing” takes place by means of the liquid carbon dioxide acting as an absorption agent.
  • cleaned liquid carbon dioxide can of course also be combined with the useful gas in a suitable “reaction vessel” outside the column for useful-gas washing to be performed there.
  • the device's operating temperature is in the range of ⁇ 0° C. to ⁇ 10° C., preferably ⁇ 60° C. to ⁇ 30° C.
  • an injecting or spraying device for injecting or spraying the liquid carbon dioxide into the container or reactor in which the harmful substances are absorbed from the useful gas, thus in the column itself, for example.
  • the exchanging surface meaning the surface of the liquid CO 2 phase, can be set or changed by way of the degree of nebulizing by means of the injecting or spraying device, with a large exchanging surface being expedient for absorbing the residual harmful substances highly efficiently.
  • the injecting or spraying device is located in the container itself, then it will be positioned expediently underneath a demister that is located in the column and through which the useful gas flows but via which fluid droplets of the liquid CO 2 are kept back.
  • the adsorption device itself is preferably a stationary bed adsorber.
  • active carbon zeolite, alum earth (aluminum oxide), a polymer having a large surface, or suchlike is employed as the adsorber medium (adsorbent), with an adsorber medium of such kind that can be very easily regenerated preferably being used.
  • Continuous operation can therein be ensured particularly if a plurality of adsorption devices have been provided that can be switched over in turns between an adsorption mode and a regeneration mode. That will enable a part of the adsorption devices to be operated continuously in the adsorption mode, and hence CO 2 cleaning to be carried out continuously, and the other part of the adsorption devices to be regenerated. Switchover between the two operating modes is performed as and when necessary so that a specific number of adsorption devices will always be operated in the adsorption mode.
  • the FIGURE shows an inventive device 1 for separating a cleaned useful gas from a gas mixture 2 occurring as a gas stream, for example a stream of exhaust gas, for instance in a power station or other industrial plant in which fossil fuels are used.
  • Gas stream 2 contains carbon dioxide as the mixture's main constituent as well as at least one useful gas such as hydrogen, for instance, and at least one harmful substance based on, for example, sulfur or mercury, for example hydrogen sulfide (H 2 S) or carbonyl sulfides (COS).
  • Exhaust gas 2 is fed as a gas stream first to a carbon-dioxide-condensing device 3 in which exhaust gas 2 is cooled to a temperature at which the carbon dioxide present therein previously in gaseous form will condense.
  • liquid carbon dioxide 5 accumulates in the column's lower region.
  • liquid carbon dioxide 5 may also contain solid carbon dioxide in particle form.
  • the operating temperature should, though, be such as to preclude a third, solid phase so that possible inclusion of the adsorption devices described below will be obviated.
  • Liquid carbon dioxide 5 augmented with harmful substances is taken off and fed to at least one, in the example shown three adsorption devices 9 in which the harmful substances contained in liquid carbon dioxide 5 are removed by adsorption.
  • the harmful substances contained in the gas mixture are automatically substantially augmented during carbon-dioxide condensing in the liquid carbon-dioxide phase. That now makes simple separating possible in adsorption devices 9 by means of adsorption.
  • Adsorption devices 9 are preferably stationary bed adsorbers into which the liquid carbon-dioxide stream is fed along with the harmful substances.
  • active carbon, zeolite, alum earth, or a polymer can be used as the adsorber medium depending on the specific harmful substance or mixtures of harmful substances requiring to be adsorbed.
  • Three adsorber devices 9 have been connected in parallel in the example shown. That offers the possibility of operating only a part, for example two adsorption devices 9 , simultaneously in the adsorption mode while the third adsorption device 9 operates in the regeneration mode in order to regenerate the adsorber medium, meaning to remove the harmful substances adsorbed thereon and desaturate the adsorber medium again.
  • Appropriate lines and valves enabling a switchover mode are provided for that purpose in a manner that is known per se but not presented in further detail.
  • a part of the cleaned liquid carbon dioxide is then conveyed back again to column 4 and nebulized there as finely as possible by means of an injecting or spraying device 13 .
  • Injecting or spraying device 13 is located close to demister 7 in a region underneath it, which is to say in the column region containing useful gas 6 .
  • Injecting or spraying cleaned carbon dioxide 10 results in a further absorption reaction between useful gas 6 or, as the case may be, the harmful substances contained therein and the fine CO 2 droplets, so the latter will absorb the residual harmful substances.
  • Cleaned useful gas 6 flowing through demister 7 and then taken off will hence be free not only from carbon dioxide but also from harmful substances.
  • Sprayed carbon dioxide 10 which will then likewise or again be laden with harmful substances, will then be taken off with liquefied carbon dioxide 5 that was fed in originally and is located in the column's lower region and fed to adsorption devices 9 again.
  • the portion of cleaned carbon dioxide 10 not taken off via feedback line 11 is fed to any kind of suitable post-processing operation.
  • the maximum temperature for the method should be ⁇ 30° C.; to prevent the carbon dioxide from solidifying it should not be below ⁇ 60° C.
  • the pressure for the method must basically be above the triple point of carbon dioxide in keeping with the temperature/pressure diagram. It is accordingly at least 5 bar.
  • the relevant operating parameters and the adsorber media employed must of course be used in conformity with the relevant gas-mixture constituents or, as the case may be, harmful substances.

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  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
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US13/575,066 2010-01-28 2011-01-20 Method for Separating a Cleaned Useful Gas From a Gas Mixture, and Device for Carrying Out Said Method Abandoned US20120304689A1 (en)

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PCT/EP2011/050756 WO2011092106A1 (de) 2010-01-28 2011-01-20 Verfahren zur abtrennung gereinigten wertgases aus einem gasgemisch, sowie vorrichtung zur durchführung dieses verfahrens

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WO2011092106A1 (de) 2011-08-04
EP2528676B1 (de) 2014-08-13
PL2528676T3 (pl) 2015-02-27
CN102740950B (zh) 2014-11-12
RU2012136598A (ru) 2014-03-10

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