WO2020075544A1 - リクレーミング装置及び方法並びにco2回収装置並びに方法 - Google Patents
リクレーミング装置及び方法並びにco2回収装置並びに方法 Download PDFInfo
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- WO2020075544A1 WO2020075544A1 PCT/JP2019/038330 JP2019038330W WO2020075544A1 WO 2020075544 A1 WO2020075544 A1 WO 2020075544A1 JP 2019038330 W JP2019038330 W JP 2019038330W WO 2020075544 A1 WO2020075544 A1 WO 2020075544A1
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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
- B01D53/14—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
- B01D53/1418—Recovery of products
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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
- B01D53/14—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
- B01D53/1425—Regeneration of liquid absorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01B—BOILING; BOILING APPARATUS ; EVAPORATION; EVAPORATION APPARATUS
- B01B1/00—Boiling; Boiling apparatus for physical or chemical purposes ; Evaporation in general
- B01B1/06—Preventing bumping
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
- B01D3/143—Fractional distillation or use of a fractionation or rectification column by two or more of a fractionation, separation or rectification step
- B01D3/148—Fractional distillation or use of a fractionation or rectification column by two or more of a fractionation, separation or rectification step in combination with at least one evaporator
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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
- B01D53/14—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
- B01D53/18—Absorbing units; Liquid distributors therefor
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/62—Carbon oxides
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/50—Carbon dioxide
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- 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
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- 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
- B01D2258/0283—Flue gases
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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
- B01D53/14—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
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- 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
Definitions
- the present disclosure relates to a reclaiming apparatus and method and a CO 2 recovery apparatus and method.
- a chemical absorption method may be adopted as a method for recovering CO 2 contained in exhaust gas from a power generation facility or the like.
- the chemical absorption method the exhaust gas containing CO 2, by contacting the absorption liquid containing absorbent, by absorbing the CO 2 in the flue gas in the absorption liquid, the removal of CO 2 from the exhaust gas.
- the absorption liquid that has absorbed CO 2 is heated by steam or the like to release the absorbed CO 2 and be regenerated, and then reused as the absorption liquid.
- contaminants from the exhaust gas, deteriorated absorbent, and the like accumulate in the absorbent. Therefore, reclaiming is performed to remove deteriorated substances and the like accumulated in the absorbing solution from the absorbing solution.
- the absorption liquid and water after CO 2 is released are supplied into a container, and the liquid (absorption liquid and water) in the container is heated to collect the evaporated absorption liquid and to include it in the absorption liquid.
- the deteriorated product is concentrated and separated from the absorption liquid.
- a kettle-type heat exchanger in which a heat exchange section (heat transfer tube bundle, etc.) is provided in a vessel (container called shell, etc.) may be used.
- a heating fluid is caused to flow in the heat exchange section to exchange heat with the heating fluid in the heat exchange section to heat and boil the fluid in the container.
- the container of the heat exchanger is larger than the heat exchange section (heat transfer tube bundle, etc.), and gas / liquid is separated in the space above the heat exchange section inside the container.
- Patent Document 1 is not directly related to the prevention of bumping in reclaiming, but as a measure for suppressing foaming in reclaiming, from the gas phase part of the gas-liquid separator (reclaiming device), It is described that an antifoaming agent is sprayed toward an interface with a liquid phase portion containing a liquid.
- Patent Document 1 does not disclose any concrete measures for suppressing bumping that may occur in reclaiming.
- At least one embodiment of the present invention aims to provide a reclaiming apparatus and method, and a CO 2 recovery apparatus and method capable of suppressing bumping in reclaiming.
- the reclaiming device is A container for reclaiming the absorbing liquid, An absorption liquid supply line for supplying the absorption liquid to the container, A heat exchange unit provided in the container for heating the liquid in the container, Withdrawing the liquid in the container, a circulation line for circulating the liquid and returning it to the container, And a circulation pump provided in the circulation line.
- the absorption liquid supply line is connected to the circulation line and configured to supply the absorption liquid to the circulation line.
- the absorbent from the absorbent supply line is supplied to the container via the circulation line, the liquid extracted from the container and the absorption liquid supply in the circulation line.
- the absorbing liquid can be introduced into the container while being sufficiently stirred with the absorbing liquid from the line. Accordingly, it is possible to suppress unevenness in the concentration of the liquid in the container, and it is possible to effectively suppress bumping in the container.
- the circulation line has a first end connected to the bottom of the container and is configured to withdraw the liquid from the container via the first end.
- the circulation line has a second end connected to the container, and is configured to return the liquid to the container via the second end, The second end is connected to the container so as to communicate with a gas phase portion inside the container.
- the liquid extracted from the container is returned to the position of the gas phase portion in the container, the liquid returned to the gas phase portion located above the liquid phase portion is It flows into the liquid phase part from above. Therefore, since the liquid returned to the container from the circulation line and the liquid in the container are agitated, the concentration unevenness and temperature unevenness of the liquid in the container are effectively reduced, and bumping in the container is prevented. It can be effectively suppressed.
- the vapor phase part may be formed above the heat exchange part in the container.
- the circulation line has a second end connected to the container, and is configured to return the liquid to the container via the second end, The second end is connected to the container at a position above the lowest position of the heat exchange section so as to communicate with the liquid phase part in the container.
- the liquid extracted from the container is returned to a relatively high position above the lowest position of the heat exchange part in the liquid phase part, and thus the liquid phase Agitation of the liquid returned to the part and the liquid in the container is promoted. Therefore, the concentration unevenness and temperature unevenness of the liquid in the container are effectively reduced, and bumping in the container can be effectively suppressed.
- a waste liquid recovery tank for storing the waste liquid from the container, A waste liquid line provided between the container and the waste liquid recovery tank, A waste liquid pump provided in the waste liquid line for sending the waste liquid from the container to the waste liquid recovery tank;
- the circulation line is formed to pass through the waste liquid pump, The waste liquid pump is configured to function as the circulation pump.
- the reclaiming device it further comprises a bumping inhibitor supply unit for adding a bumping inhibitor to the absorption liquid supply line or the circulation line.
- the forming inhibitor is added to the absorption liquid supply line or the circulation line, the absorption liquid or liquid before being supplied to the container via the absorption liquid supply line or the circulation line. It is possible to previously mix the bumping suppressor. Therefore, bumping in the container can be effectively suppressed.
- the bumping suppressor contains a rich liquid having a higher concentration of the substance to be absorbed than the absorbing liquid.
- a rich liquid having a high concentration of the substance to be absorbed for example, CO 2
- a gas that is the substance to be absorbed may be generated in the container.
- the gas becomes a bubble nucleus and In it the smooth boiling of the solution is promoted.
- the rich liquid having a higher concentration of the absorption target substance than the absorption liquid supplied to the container is supplied as the bumping inhibitor, the absorption target in the liquid in the container Bubble nuclei of the substance are formed, and bumping during reclaiming can be effectively suppressed.
- the reclaiming device is A container for reclaiming the absorbing liquid, An absorption liquid supply line for supplying the absorption liquid to the container, A heat exchange unit provided in the container for heating the liquid in the container containing the absorbing liquid, A bumping inhibitor supply unit for adding a bumping inhibitor into the container from the bottom of the container, Is provided.
- the bumping inhibitor is added from the bottom of the container into the container, bumping inside the container can be effectively suppressed.
- the bumping suppressor a gas capable of forming bubble nuclei in the liquid in the container is used as the bumping suppressor, the bubble nuclei are formed in the liquid to promote smooth boiling of the solution in the container. It As a result, bumping during reclaiming can be effectively suppressed.
- the CO 2 recovery device is An absorption tower configured to absorb CO 2 in the exhaust gas with an absorption liquid containing an absorbent; A regeneration tower for regenerating the absorption liquid from the absorption tower, The reclaiming device according to any one of (1) to (9) above, At least a part of the absorption liquid stored in the regeneration tower is configured to be supplied to the container via the absorption liquid supply line.
- the liquid in the container is extracted through the circulation line, and the liquid is circulated and returned to the container.
- the bumping inhibitor is added into the container from the bottom of the container, bumping that may occur in the container during reclaiming can be suppressed.
- a CO 2 recovery device is An absorption tower configured to absorb CO 2 in the exhaust gas with an absorption liquid containing an absorbent; A regeneration tower for regenerating the absorption liquid from the absorption tower, The reclaiming device according to (8) above, At least a part of the CO 2 lean liquid stored in the regeneration tower is configured to be supplied to the absorption liquid supply line as the absorption liquid, At least a part of the CO 2 rich liquid stored in the absorption tower is configured to be supplied to the bumping inhibitor supply unit as the bumping inhibitor.
- the CO 2 recovery device in which at least a part of the CO 2 lean liquid stored in the regeneration tower is supplied to the absorption liquid supply line as the absorption liquid, the CO stored in the absorption tower. Since at least a part of the 2 rich liquid is used as the bumping inhibitor, bumping in the container can be efficiently suppressed.
- the reclaiming method is Via the absorption liquid supply line, supplying the absorption liquid to a container provided with a heat exchange section inside, A step of heating the liquid in the container containing the absorbing liquid in the heat exchange section to perform a reclaiming treatment; Withdrawing the liquid in the container to a circulation line, A step of circulating the liquid extracted in the circulation line and returning it to the container by using a circulation pump provided in the circulation line; Is provided.
- the liquid in the container is extracted through the circulation line, and the liquid is circulated to be returned to the container. Therefore, bumping that may occur in the container during reclaiming is suppressed. be able to.
- the absorption liquid supply line is connected to the circulation line, In the step of supplying the absorbing liquid, the absorbing liquid is supplied to the container via the circulation line.
- the absorbent from the absorbent supply line is supplied to the container via the circulation line, the liquid extracted from the container and the absorption liquid supply in the circulation line.
- the absorbing liquid can be introduced into the container while being sufficiently stirred with the absorbing liquid from the line. Accordingly, it is possible to suppress unevenness in the concentration of the liquid in the container, and it is possible to effectively suppress bumping in the container.
- the method of (12) or (13) above comprises The method further comprises the step of adding a bumping inhibitor to the absorption liquid supply line or the circulation line.
- the bumping inhibitor since the bumping inhibitor is added to the absorption liquid supply line or the circulation line, the absorption liquid or the liquid before being supplied to the container via the absorption liquid supply line or the circulation line. It is possible to previously mix the bumping suppressor. Therefore, bumping in the container can be effectively suppressed.
- the CO 2 recovery method is In the absorption tower, a step of absorbing CO 2 in the exhaust gas with an absorbent containing an absorbent, Leading the absorption liquid from the absorption tower to a regeneration tower, and regenerating the absorption liquid in the regeneration tower, A step of performing the reclaiming method according to any one of (12) to (14) above, In the step of supplying the absorption liquid to the container, at least a part of the absorption liquid stored in the regeneration tower is supplied to the container.
- the liquid in the container is extracted through the circulation line and the liquid is circulated and returned to the container. Moreover, bumping that may occur in the container can be suppressed.
- a reclaiming apparatus and method capable of suppressing bumping in reclaiming, and a CO 2 recovery apparatus and method.
- absorbent may be H 2 S absorber which absorbs H 2 S
- the absorption liquid may be a H 2 S absorbent including H 2 S absorber.
- the CO 2 absorbent and the CO 2 absorbent may be simply referred to as the absorbent and the absorbent, respectively.
- FIG. 1 is a schematic diagram of an example of a CO 2 recovery device to which a reclaiming device according to an embodiment is applied.
- 2 to 6 are schematic views of the reclaiming device according to the embodiment, respectively.
- the CO 2 recovery device shown in FIG. 1 is a device for recovering CO 2 from exhaust gas discharged from power generation equipment, factories and the like.
- a CO 2 recovery device 1 includes an absorption tower 2 for absorbing CO 2 in exhaust gas from a power generation facility and the like, and a regeneration for regenerating the absorption liquid that has absorbed CO 2.
- the tower 4 a reflux water drum 6 configured to separate the gas released from the regeneration tower 4 into CO 2 gas and condensed water, and recirculate the condensed water to the regeneration tower 4, and perform a reclaiming treatment of the absorbing liquid.
- Exhaust gas containing CO 2 is supplied to the absorption tower 2 through the exhaust gas introduction line 12.
- a pretreatment device for pretreatment (desulfurization, cooling, etc.) of the exhaust gas may be provided on the upstream side of the absorption tower 2, and the exhaust gas after such pretreatment is absorbed. It may be supplied to the tower 2.
- Absorption tower 2 for example, has an absorption portion 14 composed of a filling layer, the absorber 14, the CO 2 absorbing solution containing CO 2 absorbent are supplied from above.
- the exhaust gas flowing into the absorption tower 2 through the exhaust gas introduction line 12 flows upward in the absorption tower 2 from the tower bottom side of the absorption tower 2 and flows into the absorption section 14. Then, in the absorption part 14, the exhaust gas and the CO 2 absorption liquid supplied from above the absorption part 14 come into counterflow contact with each other, whereby the CO 2 in the exhaust gas is absorbed by the CO 2 absorption liquid. ing.
- the CO 2 absorbent may be an aqueous solution of CO 2 absorbent.
- the type of CO 2 absorbent is not particularly limited, and may be, for example, an alkanolamine represented by monoethanolamine or diethanolamine, or a base other than amine such as sodium hydroxide, potassium hydroxide and calcium hydroxide. It may be a sexual substance.
- the exhaust gas from which the CO 2 gas has been removed by contact with the CO 2 absorbing liquid in the absorption section 14 is exhausted to the outside from the tower top 16 of the absorption tower 2.
- the CO 2 absorbing liquid that has absorbed CO 2 in the exhaust gas in the absorption section 14 descends to the tower bottom of the absorption tower 2 and is stored in the tower bottom.
- the CO 2 absorbent stored in the bottom of the absorption tower 2 has a higher CO 2 concentration than the CO 2 absorbent stored in the bottom of the regeneration tower 4 described later (CO 2 rich solution).
- the rich absorption liquid 18 is supplied from the absorption tower 2 to the regeneration tower 4 via the rich liquid line 20 by a pump (not shown) provided in the rich liquid line 20.
- the rich liquid line 20 for exchanging heat between the rich absorbing liquid flowing in the rich liquid line 20 and the lean absorbing liquid (CO 2 lean liquid) flowing in the lean liquid line 36 described later.
- the heat exchanger 22 may be provided. By heating the rich absorbent by heat exchange with the lean absorbent having a relatively high temperature, regeneration of the absorbent in the regeneration tower 4 described later can be promoted.
- Regenerator 4 is provided with a release unit 24 to release CO 2 gas from the rich absorbing liquid, a cleaning unit 26 for cleaning the CO 2 gas emitted by the emitting unit 24 at reflux water, the.
- the discharge part 24 has a filling material, and the rich absorbing liquid from the rich liquid line 20 is supplied from above.
- the rich absorbing solution releases CO 2 gas by being heated by steam described later in the releasing section 24, and becomes a lean absorbing solution having a relatively low CO 2 content rate.
- the lean absorbent which has released the CO 2 gas in the release section 24, descends from the regeneration tower 4 and is stored in the bottom of the regeneration tower 4.
- the lean absorption liquid 28 is guided to the regenerative heater (reboiler) 32 provided on the reboiler line 30 via the reboiler line 30.
- the regeneration heater 32 at least a part of the lean absorption liquid 28 undergoes heat exchange with a heating medium (such as water vapor) to become saturated vapor, and is introduced to the bottom of the regeneration tower 4.
- the saturated vapor thus generated by the regenerative heater 32 rises in the regenerator 4 toward the discharge section 24 and is used as a heating source for heating the rich absorption liquid in the discharge section 24.
- the lean absorbent stored in the bottom of the regeneration tower 4 (including the lean absorbent not undergoing phase change in the regenerator 32) is withdrawn from the bottom of the regeneration tower 4 and provided in the lean liquid line 36. It is supplied to the absorption part 14 of the absorption tower 2 through the lean liquid line 36 by the feeding pump (not shown) and is reused as the above-mentioned CO 2 absorbing liquid. Note that the lean liquid line 36 may be provided with a cooler 38 for cooling the lean absorbent.
- the CO 2 gas released from the rich absorbing solution in the release section 24 rises to the cleaning section 26 provided above the release section 24 in the regeneration tower 4.
- the cleaning unit 26 may be one that promotes gas-liquid contact between the CO 2 gas and the first cleaning liquid, and may include, for example, one or more trays or packing layers.
- the CO 2 gas that has passed through the cleaning unit 26 is discharged from the top of the regeneration tower 4 and guided to the CO 2 gas line 40.
- a condenser 42 is provided on the CO 2 gas line 40, the CO 2 gas is cooled in the condenser 42, and vapor in the CO 2 gas is condensed.
- the CO 2 gas that has passed through the condenser 42 is guided to the reflux water drum 6 provided on the outlet side of the CO 2 gas line 40.
- the reflux water drum 6 is configured to separate the gas released from the regeneration tower 4 (CO 2 -containing gas) into CO 2 gas and condensed water.
- the condensed water 44 separated by the reflux water drum 6 is stored at the tower bottom of the reflux water drum 6.
- the condensed water 44 is supplied as a cleaning liquid to the cleaning unit 26 of the regeneration tower 4 via the reflux water line 46. Further, the condensed water 44 is supplied to the reclaiming device 10 via a water supply line 58.
- the CO 2 gas separated by the reflux water drum 6 is discharged from the reflux water drum 6 via a recovery line 48 connected to the tower top of the reflux water drum 6, and, for example, a compressor (provided in the recovery line 48 ( After being compressed (not shown), it is taken out of the system as product CO 2 .
- the reclaiming device 10 is repeatedly reused in the CO 2 recovery device 1 to remove the non-volatile components from the CO 2 absorbing liquid in which the non-volatile components such as the contaminants from the exhaust gas and the deterioration products of the absorbing liquid are accumulated. At the same time, the CO 2 absorbent is recovered and returned to the CO 2 recovery device 1.
- the reclaiming device 10 includes a container 50 (a container for performing a reclaiming process) for storing an absorbing liquid and water, and an absorbing liquid supply for supplying the absorbing liquid to the container 50.
- an absorbent liquid supply line 54 is provided with an absorbent liquid valve 56 for adjusting the supply amount of the absorbent liquid to the container 50, and a water supply line 58 adjusts the water supply amount to the container 50.
- a water valve 60 is provided for this purpose.
- the heating unit 52 may be configured to heat the liquid in the container by heat exchange between the liquid in the container and the heating medium.
- the heating unit 52 includes a U-shaped heat transfer tube provided inside the container 50.
- the heating unit 52 the liquid in the container is heated by heat exchange with a heating medium. It may be like this.
- the heating medium supplied to the heating unit 52 may be, for example, steam or oil.
- the heating unit 52 may be configured to heat the liquid in the container 50 with electric power.
- the absorbent supply line 54 may be configured to guide the lean absorbent (CO 2 lean solution) from the lean solution line 36.
- the lean absorption liquid is guided to the absorption liquid supply line 54 from the lean liquid line 36 on the upstream side of the heat exchanger 22, but in other embodiments, the heat The lean absorption liquid may be introduced to the absorption liquid supply line 54 from the lean liquid line 36 on the downstream side of the exchanger 22.
- a part of the condensed water 44 stored in the reflux water drum 6 may be guided to the water supply line 58.
- the water supplied to the container 50 is not limited to the condensed water from the reflux water drum 6. Instead of the condensed water from the reflux water drum 6, or in addition to the condensed water, water from another supply source may be supplied to the container 50.
- the outlet of the steam discharge line 62 may be connected to the regeneration tower 4 as shown in FIG. 1, for example. That is, the steam discharged from the container 50 may be guided to the regeneration tower 4.
- a reclaiming apparatus 10 includes a container 50 described above, a waste liquid recovery tank 78 for storing the waste liquid from the container 50, the container 50 and the waste liquid recovery tank.
- the waste liquid line 68 is provided between the waste liquid line 68 and the waste liquid cooler 72.
- the waste liquid line 68 is provided with a waste liquid pump 74 for sending the waste liquid from the container 50 to the waste liquid recovery tank 78.
- a waste liquid valve 70 is provided in the waste liquid line 68.
- the waste liquid cooler 72 is configured to cool the waste liquid from the container 50.
- the waste liquid cooler 72 is configured to supply a cooling medium, for example, and may be configured to cool the waste liquid by heat exchange with the cooling medium.
- the outline of the procedure for reclaiming the absorbing liquid using the above-mentioned reclaiming device 10 is as follows.
- the absorbing liquid valve 56 and the water valve 60 are opened, the absorbing liquid and water are supplied into the container 50, and the liquid in the container is heated by the heating unit 52, so that the volatile components (water and absorbent ) Is evaporated and the non-volatile components (degradation products of the absorption liquid, etc.) are concentrated in the liquid in the container 50 to separate the absorbent in the liquid from the non-volatile components (absorption liquid regeneration step).
- the vapor containing the absorbent generated by heating is discharged from the container 50 through the vapor discharge line 62 and returned to the regeneration tower 4 of the CO 2 recovery device 1. Absorbent returned to the regenerator 4 it is again used in the CO 2 recovering apparatus 1 as an absorption liquid to absorb CO 2.
- the absorption liquid valve 56 is closed to supply the absorption liquid to the container 50. Stop.
- the water valve 60 is closed to stop the supply of water to the container 50 and the heating of the liquid by the heating unit 52.
- the residue in the container 50 is discharged as waste liquid to the outside of the container 50 through the waste liquid line 68 (discharging step). More specifically, the waste liquid valve 70 provided in the waste liquid line 68 is opened, and the waste liquid pump 74 is started. As a result, the waste liquid containing the reclaiming residue remaining in the container 50 after the absorption liquid recovery step is discharged from the container 50 and transferred to the waste liquid recovery tank 78 via the waste liquid line 68. The waste liquid discharged from the container 50 is cooled by the waste liquid cooler 72 provided in the waste liquid line 68, and then transferred to the waste liquid recovery tank 78.
- the reclaiming device 10 shown in FIGS. 2 and 3 includes a circulation line 90 and a circulation pump 98 provided in the circulation line 90.
- the circulation line 90 is configured to draw out the liquid in the container 50 and circulate the liquid on the top of the container 50.
- the absorption liquid supply line 54 is connected to the circulation line 90 and is configured to supply the absorption liquid to the circulation line 90.
- the circulation line 90 includes a circulation passage 92 having a first end 102 and second ends 104A, 104B connected to the container 50.
- the circulation line 90 has a first end 102 connected to the bottom of the container 50, and the liquid is drawn from the container 50 via the first end 102.
- the circulation line 90 has second ends 104A and 104B connected to the container 50, and is configured to return the liquid to the container 50 via the second ends 104A and 104B.
- the second end 104A is connected to the container 50 at the top of the container 50, so that the liquid from the circulation line 90 flows into the vapor phase part in the container 50 via the second end 104A. It has become.
- the second end 104B is connected to the container 50 at a position above the lowermost position 52A of the heating section 52, and at this position, the liquid from the circulation line 90 flows into the liquid phase part in the container 50. It is supposed to do.
- the reclaiming apparatus 10 operates the circulation pump 98 while performing the above-described absorption liquid regeneration process or absorption liquid recovery process, thereby supplying the absorption liquid to the circulation line 90 and the container.
- the liquid in 50 can be extracted, and the liquid can be circulated and returned to the container 50.
- the circulation line 90 includes a bypass line 94 having both ends connected to the waste liquid line 68, and a waste liquid line that is a part of the waste liquid line 68 upstream of the bypass line 94. It includes an upstream portion 68a, a waste liquid line downstream portion 68b which is a portion of the waste liquid line 68 downstream of the bypass line 94, and a return line 96.
- the waste liquid line upstream portion 68 a (circulation line 90) has a first end 102 connected to the bottom of the container 50, and the liquid is extracted from the container 50 via the first end 102. It is like this.
- the return line 96 (circulation line 90) has second ends 104A and 104B connected to the container 50, and is configured to return the liquid to the container 50 via the second ends 104A and 104B.
- the second end 104A is connected to the container 50 at the top of the container 50, so that the liquid from the circulation line 90 flows into the vapor phase part in the container 50 via the second end 104A. It has become.
- the second end 104B is connected to the container 50 at a position above the lowermost position 52A of the heating section 52, and at this position, the liquid from the circulation line 90 flows into the liquid phase part in the container 50. It is supposed to do.
- the bypass line 94 is provided so as to bypass the waste liquid valve 70 and the waste liquid cooler 72 provided in the waste liquid line 68.
- a valve 95 is provided on the bypass line 94.
- a waste liquid pump 74 is provided at the downstream portion 68b of the waste liquid line.
- the waste liquid pump 74 functions as the circulation pump 98 described above.
- the return line 96 has one end connected to the waste liquid line 68 on the downstream side of the waste liquid pump 74 and the other end (the above-mentioned second ends 104A and 104B) connected to the container 50.
- a valve 97 is provided on the return line 96.
- a valve 75 for switching the flow of the waste liquid to the waste liquid recovery tank 78 is provided on the downstream side of the connection point of the return line 96.
- the absorption liquid supply line 54 is connected to the waste liquid line upstream portion 68a.
- the waste liquid valve 70 and the valve 75 provided in the waste liquid line 68 are closed during the above-described absorption liquid regeneration process or absorption liquid recovery process.
- the valves 95 and 97 provided in the circulation line 90 are opened to operate the waste liquid pump 74 (circulation pump 98).
- the reclaiming device 10 further comprises a bumping inhibitor supply 80 for adding the bumping inhibitor to the absorbent or liquid in the container 50.
- the bumping suppressor supply 80 is configured to add a bumping suppressor to the absorbent supply line 54. 2 to 5, the bumping suppressor supply unit 80 is configured to inject the bumping suppressor into the absorbing liquid supply line 54 on the upstream side of the confluence point with the water supply line 58.
- the bumping inhibitor may be injected into the absorbing liquid supply line 54 at the downstream side of the confluence with the water supply line 58.
- the bumping suppressor supply 80 may be configured to add the bumping suppressor to the circulation line 90, or alternatively, as shown in FIG. It may be configured to add an agent.
- the bumping inhibitor supply unit 80 is configured to add the bumping inhibitor into the container 50 from the bottom of the container 50.
- a gas containing an inert gas such as nitrogen (N 2 ) or carbon dioxide (CO 2 ) for example, nitrogen, air, carbon dioxide, etc.
- N 2 nitrogen
- CO 2 carbon dioxide
- the gas becomes a bubble nucleus in the liquid in the container 50, thereby facilitating smooth boiling of the liquid. Therefore, bumping in the container 50 is effectively suppressed.
- a rich liquid having a higher concentration of the substance to be absorbed than the absorbing liquid supplied to the container through the absorbing liquid supply line 54 may be used.
- a rich liquid having a high concentration of a substance to be absorbed for example, CO 2 etc.
- a gas that is the substance to be absorbed may be generated in the container 50.
- the gas becomes a bubble nucleus.
- the smooth boiling of the solution in the container is promoted. Therefore, by using the above-described rich liquid as the bumping suppressor, bubble nuclei of the substance to be absorbed are formed in the liquid in the container 50, and bumping during reclaiming can be effectively suppressed.
- the bumping suppressor supply unit 80 includes the rich liquid supply line 84 for injecting the rich liquid (the bumping suppressor) into the absorbing liquid supply line 54, and the rich liquid supply line 84. And a rich liquid valve 86 for adjusting the supply amount of the rich liquid to the absorbing liquid supply line 54. By adjusting the rich liquid valve 86, a desired amount of rich liquid can be supplied to the absorption liquid supply line 54.
- At least a part of the lean absorption liquid 28 (CO 2 lean liquid) stored in the regeneration tower 4 of the CO 2 recovery device 1 is used as the absorption liquid.
- At least a part of the rich absorbing liquid 18 (CO 2 rich liquid) stored in the absorption tower 2 while being supplied to the liquid supplying line serves as the bumping suppressing agent in the rich liquid supplying line 84 (the bumping suppressing agent). It is adapted to be supplied to the supply unit 80).
- the rich absorbing liquid (CO 2 rich liquid) is introduced from the rich liquid line 20 on the upstream side of the heat exchanger 22 to the rich liquid supply line 84, but another embodiment. Then, the rich absorbing liquid may be guided to the rich liquid supply line 84 from the rich liquid line 20 on the downstream side of the heat exchanger 22.
- the bumping suppressor supply unit 80 in FIGS. 2 and 3 may be the bumping suppressor supply unit 80 including the rich liquid supply line 84 and the rich liquid valve 86, similar to the embodiment shown in FIG.
- the bumping suppressor supply unit 80 of another form may be used.
- the liquid in the container is extracted through the circulation line, and the liquid is circulated and returned to the container. It is possible to suppress bumping that may occur due to concentration of deteriorated substances and the like.
- the present invention is not limited to the above-described embodiment, and includes a form in which the above-described embodiment is modified and a form in which these forms are appropriately combined.
- expressions representing shapes such as a square shape and a cylindrical shape not only represent shapes such as a square shape and a cylindrical shape in a strictly geometrical sense, but also to the extent that the same effect can be obtained. , And a shape including an uneven portion and a chamfered portion. Further, in this specification, the expressions “comprising”, “including”, or “having” one element are not exclusive expressions excluding the existence of other elements.
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Abstract
Description
化学吸収法では、CO2を含む排ガスと、吸収剤を含む吸収液とを接触させて、排ガス中のCO2を吸収液に吸収させることで、排ガスからCO2を除去する。CO2を吸収した吸収液は、蒸気等により加熱されることで、吸収したCO2を放出して再生された後、吸収液として再利用される。このようにして吸収液を繰り返し再利用すると、排ガスからの混入物や吸収液劣化物等が吸収液中に蓄積する。そこで、吸収液中に蓄積した劣化物等を該吸収液から除去するリクレーミングが行われる。
吸収液のリクレーミング処理をするための容器と、
前記容器に前記吸収液を供給するための吸収液供給ラインと、
前記容器内に設けられ、前記容器内の液体を加熱するための熱交換部と、
前記容器内の液体を抜き出して、該液体を循環させて前記容器に戻すための循環ラインと、
前記循環ラインに設けられた循環ポンプと、を備える。
この点、上記(1)の構成によれば、循環ラインを介して、容器内の液体を抜き出すとともに、該液体を循環させて容器に戻すようにしたので、上述した容器内で生じ得る突沸を抑制することができる。
前記吸収液供給ラインは、前記循環ラインに接続され、前記循環ラインに前記吸収液を供給するように構成される。
前記循環ラインは、前記容器の底部に接続された第1端を有し、前記第1端を介して前記容器から前記液体を抜き出すように構成される。
この点、上記(3)の構成によれば、溶液温度が低く、不揮発性物質濃度が高くなりやすい容器底部から液体を抜き出して、循環ラインを通って循環させるようにしたので、容器内の液体における濃度ムラ、温度ムラを効果的に低減し、容器内での突沸を効果的に抑制することができる。
前記循環ラインは、前記容器に接続される第2端を有し、前記第2端を介して前記液体を前記容器に戻すように構成され、
前記第2端は、前記容器内の気相部に連通するように前記容器に接続される。
なお、気相部は、容器内において、熱交換部の上方に形成されていてもよい。
前記循環ラインは、前記容器に接続される第2端を有し、前記第2端を介して前記液体を前記容器に戻すように構成され、
前記第2端は、前記容器内の液相部に連通するように、前記熱交換部の最下位置よりも上方の位置において前記容器に接続される。
前記容器からの廃液を貯留するための廃液回収タンクと、
前記容器と前記廃液回収タンクとの間に設けられた廃液ラインと、
前記廃液ラインに設けられ、前記容器からの廃液を前記廃液回収タンクに送るための廃液ポンプと、を備え、
前記循環ラインは、前記廃液ポンプを通るように形成され、
前記廃液ポンプは、前記循環ポンプとして機能するように構成される。
前記リクレーミング装置は、
前記吸収液供給ライン又は前記循環ラインに突沸抑制剤を添加するための突沸抑制剤供給部をさらに備える。
前記突沸抑制剤は、前記吸収液よりも吸収対象物質の濃度が高いリッチ液を含む。
この点、上記(8)の構成によれば、容器に供給される吸収液よりも吸収対象物質の濃度が高いリッチ液を突沸抑制剤として供給するようにしたので、容器内の液体において吸収対象物質の気泡核が形成され、リクレーミングにおける突沸を効果的に抑制することができる。
吸収液のリクレーミング処理をするための容器と、
前記容器に前記吸収液を供給するための吸収液供給ラインと、
前記容器内に設けられ、前記吸収液を含む前記容器内の液体を加熱するための熱交換部と、
前記容器の底部から該容器内に突沸抑制剤を添加するための突沸抑制剤供給部と、
を備える。
例えば、突沸抑制剤として、容器内の液体中に気泡核を形成することが可能なガスを用いれば、液体中に気泡核が形成されることで、容器内において溶液のスムーズな沸騰が促進される。これにより、リクレーミングにおける突沸を効果的に抑制することができる。
吸収剤を含有する吸収液に排ガス中のCO2を吸収させるように構成された吸収塔と、
前記吸収塔からの前記吸収液を再生するための再生塔と、
上記(1)乃至(9)の何れかに記載のリクレーミング装置と、を備え、
前記再生塔に貯留された前記吸収液の少なくとも一部が、前記吸収液供給ラインを介して前記容器に供給されるように構成される。
吸収剤を含有する吸収液に排ガス中のCO2を吸収させるように構成された吸収塔と、
前記吸収塔からの前記吸収液を再生するための再生塔と、
上記(8)に記載のリクレーミング装置と、を備え、
前記再生塔に貯留されたCO2リーン液の少なくとも一部が、前記吸収液として前記吸収液供給ラインに供給されるように構成され、
前記吸収塔に貯留されたCO2リッチ液の少なくとも一部が、前記突沸抑制剤として前記突沸抑制剤供給部に供給されるように構成される。
吸収液供給ラインを介して、内部に熱交換部が設けられた容器に吸収液を供給するステップと、
前記吸収液を含む前記容器内の液体を前記熱交換部で加熱してリクレーミング処理するステップと、
前記容器内の前記液体を循環ラインに抜き出すステップと、
前記循環ラインに抜き出した前記液体を、前記循環ラインに設けられた循環ポンプを用いて循環させて前記容器に戻すステップと、
を備える。
前記吸収液供給ラインは前記循環ラインに接続され、
前記吸収液を供給するステップでは、前記吸収液を、前記循環ラインを介して前記容器に供給する。
前記吸収液供給ライン又は前記循環ラインに突沸抑制剤を添加するステップをさらに備える。
吸収塔において、吸収剤を含有する吸収液に排ガス中のCO2を吸収させるステップと、
前記吸収塔からの前記吸収液を再生塔に導き、該再生塔において前記吸収液を再生するステップと、
上記(12)乃至(14)の何れかに記載のリクレーミング方法を行うステップと、を備え、
前記容器に吸収液を供給するステップでは、前記再生塔に貯留された前記吸収液の少なくとも一部を前記容器に供給する。
図1は、一実施形態に係るリクレーミング装置が適用されるCO2回収装置の一例の概略図である。図2~図6は、それぞれ、一実施形態に係るリクレーミング装置の概略図である。
排ガス導入ライン12を介して吸収塔2に流入した排ガスは、吸収塔2の塔底部側から吸収塔2内を上方に流れていき、吸収部14へと流れ込む。そして、吸収部14において、排ガスと、該吸収部14の上方から供給されるCO2吸収液とが対向流接触することにより、排ガス中のCO2がCO2吸収液に吸収されるようになっている。
CO2吸収剤の種類は特に限定されないが、例えば、モノエタノールアミン、ジエタノールアミンに代表されるアルカノールアミンであってもよく、あるいは、水酸化ナトリウム、水酸化カリウム及水酸化カルシウム等のアミン以外の塩基性物質であってもよい。
一方、吸収部14において排ガス中のCO2を吸収したCO2吸収液は、吸収塔2の塔底部に下降し、該塔底部に貯留される。この吸収塔2の塔底部に貯留されたCO2吸収液は、後述する再生塔4の塔底部に貯留されるCO2吸収液に比べてCO2濃度が高いリッチ吸収液18(CO2リッチ液)である。このリッチ吸収液18は、リッチ液ライン20に設けられたポンプ(不図示)により、該リッチ液ライン20を介して、吸収塔2から再生塔4に供給されるようになっている。
洗浄部26は、CO2ガスと第1洗浄液との気液接触を促進させるものであればよく、例えば、1段以上のトレイ又は充填層を含んでいてもよい。
例えば図1に示すように、加熱部52は、容器50の内部に設けられたU字形の伝熱管を含み、該加熱部52では、加熱媒体との熱交換により容器内の液体が加熱されるようになっていてもよい。加熱部52に供給される加熱媒体は、例えば、水蒸気や油であってもよい。
廃液ライン68には、容器50からの廃液を廃液回収タンク78に送るための廃液ポンプ74が設けられている。また、廃液ライン68には廃液バルブ70が設けられている。
また、容器50から排出された廃液は、廃液ライン68に設けられた廃液クーラ72で冷却されてから、廃液回収タンク78に移送されるようになっている。
図2~図5に示す例示的な実施形態では、突沸抑制剤供給部80は、吸収液供給ライン54に突沸抑制剤を添加するように構成されている。なお、図2~図5においては、突沸抑制剤供給部80は、水供給ライン58との合流点よりも上流側において吸収液供給ライン54に突沸抑制剤を注入するように構成されているが、他の実施形態では、水供給ライン58との合流点よりも下流側において吸収液供給ライン54に突沸抑制剤を注入するようにしてもよい。
吸収対象物質(例えばCO2等)の濃度が高いリッチ液を容器50内の液体に供給すると、容器50内において吸収対象物質であるガスが生じる場合があり、この場合、該ガスが気泡核となり、容器内において溶液のスムーズな沸騰が促進される。
よって、上述のリッチ液を突沸抑制剤として用いることにより、容器50内の液体において吸収対象物質の気泡核が形成され、リクレーミングにおける突沸を効果的に抑制することができる。
例えば、「同一」、「等しい」及び「均質」等の物事が等しい状態であることを表す表現は、厳密に等しい状態を表すのみならず、公差、若しくは、同じ機能が得られる程度の差が存在している状態も表すものとする。
また、本明細書において、四角形状や円筒形状等の形状を表す表現は、幾何学的に厳密な意味での四角形状や円筒形状等の形状を表すのみならず、同じ効果が得られる範囲で、凹凸部や面取り部等を含む形状も表すものとする。
また、本明細書において、一の構成要素を「備える」、「含む」、又は、「有する」という表現は、他の構成要素の存在を除外する排他的な表現ではない。
4 再生塔
6 還流水ドラム
10 リクレーミング装置
12 排ガス導入ライン
14 吸収部
16 塔頂部
18 リッチ吸収液
20 リッチ液ライン
22 熱交換器
24 放出部
26 洗浄部
28 リーン吸収液
30 リボイラライン
32 再生加熱器
36 リーン液ライン
38 冷却器
40 CO2ガスライン
42 コンデンサ
44 凝縮水
46 還流水ライン
48 回収ライン
50 容器
52 加熱部
52A 最下位置
54 吸収液供給ライン
56 吸収液バルブ
58 水供給ライン
60 水バルブ
62 蒸気排出ライン
68 廃液ライン
68a 廃液ライン上流部
68b 廃液ライン下流部
70 廃液バルブ
72 廃液クーラ
74 廃液ポンプ
75 バルブ
78 廃液回収タンク
80 突沸抑制剤供給部
84 リッチ液供給ライン
86 リッチ液バルブ
90 循環ライン
92 循環通路
94 バイパスライン
95 バルブ
96 戻りライン
97 バルブ
98 循環ポンプ
102 第1端
104A,104B 第2端
Claims (15)
- 吸収液のリクレーミング処理をするための容器と、
前記容器に前記吸収液を供給するための吸収液供給ラインと、
前記容器内に設けられ、前記容器内の液体を加熱するための熱交換部と、
前記容器内の液体を抜き出して、該液体を循環させて前記容器に戻すための循環ラインと、
前記循環ラインに設けられた循環ポンプと、を備えた
ことを特徴とするリクレーミング装置。 - 前記吸収液供給ラインは、前記循環ラインに接続され、前記循環ラインに前記吸収液を供給するように構成された
ことを特徴とする請求項1に記載のリクレーミング装置。 - 前記循環ラインは、前記容器の底部に接続された第1端を有し、前記第1端を介して前記容器から前記液体を抜き出すように構成された
ことを特徴とする請求項1又は2に記載のリクレーミング装置。 - 前記循環ラインは、前記容器に接続される第2端を有し、前記第2端を介して前記液体を前記容器に戻すように構成され、
前記第2端は、前記容器内の気相部に連通するように前記容器に接続された
ことを特徴とする請求項1乃至3の何れか一項に記載のリクレーミング装置。 - 前記循環ラインは、前記容器に接続される第2端を有し、前記第2端を介して前記液体を前記容器に戻すように構成され、
前記第2端は、前記容器内の液相部に連通するように、前記熱交換部の最下位置よりも上方の位置において前記容器に接続された
ことを特徴とする請求項1乃至4の何れか一項に記載のリクレーミング装置。 - 前記容器からの廃液を貯留するための廃液回収タンクと、
前記容器と前記廃液回収タンクとの間に設けられた廃液ラインと、
前記廃液ラインに設けられ、前記容器からの廃液を前記廃液回収タンクに送るための廃液ポンプと、を備え、
前記循環ラインは、前記廃液ポンプを通るように形成され、
前記廃液ポンプは、前記循環ポンプとして機能するように構成された
ことを特徴とする請求項1乃至5の何れか一項に記載のリクレーミング装置。 - 前記吸収液供給ライン又は前記循環ラインに突沸抑制剤を添加するための突沸抑制剤供給部をさらに備える
ことを特徴とする請求項1乃至6の何れか一項に記載のリクレーミング装置。 - 前記突沸抑制剤は、前記吸収液よりも吸収対象物質の濃度が高いリッチ液を含む
ことを特徴とする請求項7に記載のリクレーミング装置。 - 吸収液のリクレーミング処理をするための容器と、
前記容器に前記吸収液を供給するための吸収液供給ラインと、
前記容器内に設けられ、前記吸収液を含む前記容器内の液体を加熱するための熱交換部と、
前記容器の底部から該容器内に突沸抑制剤を添加するための突沸抑制剤供給部と、
を備えることを特徴とするリクレーミング装置。 - 吸収剤を含有する吸収液に排ガス中のCO2を吸収させるように構成された吸収塔と、
前記吸収塔からの前記吸収液を再生するための再生塔と、
請求項1乃至9の何れか一項に記載のリクレーミング装置と、を備え、
前記再生塔に貯留された前記吸収液の少なくとも一部が、前記吸収液供給ラインを介して前記容器に供給されるように構成された
ことを特徴とするCO2回収装置。 - 吸収剤を含有する吸収液に排ガス中のCO2を吸収させるように構成された吸収塔と、
前記吸収塔からの前記吸収液を再生するための再生塔と、
請求項8に記載のリクレーミング装置と、を備え、
前記再生塔に貯留されたCO2リーン液の少なくとも一部が、前記吸収液として前記吸収液供給ラインに供給されるように構成され、
前記吸収塔に貯留されたCO2リッチ液の少なくとも一部が、前記突沸抑制剤として前記突沸抑制剤供給部に供給されるように構成されたことを特徴とするCO2回収装置。 - 吸収液供給ラインを介して、内部に熱交換部が設けられた容器に吸収液を供給するステップと、
前記吸収液を含む前記容器内の液体を前記熱交換部で加熱してリクレーミング処理するステップと、
前記容器内の前記液体を循環ラインに抜き出すステップと、
前記循環ラインに抜き出した前記液体を、前記循環ラインに設けられた循環ポンプを用いて循環させて前記容器に戻すステップと、
を備えることを特徴とするリクレーミング方法。 - 前記吸収液供給ラインは前記循環ラインに接続され、
前記吸収液を供給するステップでは、前記吸収液を、前記循環ラインを介して前記容器に供給する
ことを特徴とする請求項12に記載のリクレーミング方法。 - 前記吸収液供給ライン又は前記循環ラインに突沸抑制剤を添加するステップをさらに備える
ことを特徴とする請求項12又は13に記載のリクレーミング方法。 - 吸収塔において、吸収剤を含有する吸収液に排ガス中のCO2を吸収させるステップと、
前記吸収塔からの前記吸収液を再生塔に導き、該再生塔において前記吸収液を再生するステップと、
請求項12乃至14の何れか一項に記載のリクレーミング方法を行うステップと、を備え、
前記容器に吸収液を供給するステップでは、前記再生塔に貯留された前記吸収液の少なくとも一部を前記容器に供給する、
ことを特徴とするCO2回収方法。
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