JP5117612B2 - Carbon dioxide recovery device - Google Patents

Description

  The present invention relates to a carbon dioxide recovery device that recovers carbon dioxide contained in combustion exhaust gas of fossil fuel (for example, coal) in a power generation system or the like.

  Currently, from the viewpoint of global warming, efforts are being made worldwide to reduce greenhouse gas emissions. One of these is the suppression of emissions of carbon dioxide, a greenhouse gas. In order to control carbon dioxide emissions, efforts are being actively made on power generation systems such as the use of natural energy, promotion of nuclear power generation, energy saving, and high efficiency of power generation.

  In addition, as a method for discharging carbon dioxide by improving and improving the current power generation technology, a technology for recovering carbon dioxide from combustion exhaust gas using fossil fuel that accounts for the majority of power generation has been developed. The separation and purification technology of the gas that recovers carbon dioxide contained in the combustion exhaust gas includes an adsorption method using a solid adsorbent and its derivative technologies such as a pressure swing adsorption method and a temperature swing adsorption method, and a hot alkali using an alkali metal salt solution. And a membrane separation method using an organic polymer or an inorganic material having a fine pore size. Among them, the amine method using the chemical absorption action of an absorption liquid mainly composed of alkanolamine is one of the most focused in the world.

  The amine method is held in the absorption liquid by absorbing the carbon dioxide in the absorption liquid (hereinafter referred to as the absorption liquid) containing alkanolamine as the main component and by heating the absorption liquid that has absorbed the carbon dioxide. The carbon dioxide is released to regenerate the absorbent. It is necessary to supply heat from outside the system for the regeneration operation of the absorbent.

  The energy required for carbon dioxide recovery in the amine method is mainly heat for regeneration operation. When fossil fuel combustion exhaust gas is a target for carbon dioxide recovery, the fossil fuel combustion heat is often used as a heat source for the regeneration operation of the absorbent. For this reason, an apparatus configuration with a small amount of heat required for the carbon dioxide recovery process is required.

  Moreover, when coal etc. are used for fuel, sulfur oxide, soot, etc. are mixed in combustion exhaust gas. These sulfur oxides, dust, etc. are usually removed by a removal process. However, trace amounts of these sulfur oxides, dust, etc. are accumulated in the absorption liquid, and heat exchangers and transportation equipment are contaminated and absorbed. There is a possibility of effects such as changes in liquid properties. Further, the deterioration product of the absorbing liquid and the corrosion product of the structural material may have the same influence. For this reason, the impurities (trace components) accumulated in the absorption liquid described above need to be promptly removed. In addition, it is necessary to establish a technique with little loss of absorption liquid and heat loss due to removal.

  In order to solve the above problem, a filtration membrane device is provided in the carbon dioxide recovery device, and an evaporator for heating and concentrating the impurity-containing liquid recovered from the filtration membrane device is disposed and accumulated in the absorption liquid of the carbon dioxide recovery device. A method for removing solids (Patent Document 1) and an anion exchange resin tower in a carbon dioxide recovery unit, and a small liquid separator in the previous stage to remove solids and anion impurities in the absorbent. A method (Patent Document 2) is proposed.

JP 2008-207123 A JP 2008-238113 A

  In Patent Document 1, the operation in the filtration membrane device is not clearly described, and there is a problem that the thermal energy of the absorbing liquid discharged from the regeneration tower that becomes a high temperature of 100 ° C. or higher is lost. Moreover, in the said high temperature environment, there is no description regarding the filtration membrane raw material to be used, and depending on the material to be selected, there is a problem that impurities are eluted in the absorbing solution by the eluate from the membrane raw material.

  Patent Document 2 describes a method of removing ionic impurities with an anion exchange resin. However, it is known that cation impurities derived from anion exchange groups having amino groups are eluted from the ion exchange groups of the ion exchange resin due to deterioration. For this reason, cation impurity countermeasures such as cation exchange resin are usually provided after the anion exchange resin, but there is a problem in its operation method under an absorbing solution that becomes an alkaline environment containing a high concentration of alkanolamine. is there.

  Further, in Patent Document 2, an anion exchange resin tower is provided for removing an organic acid caused by an oxidative degradation product of an alkanolamine. However, the ion exchange group of the anion exchange resin is heat or oxidative degradation. It is known to have low tolerance. For this reason, the use of an anion exchange resin in an environment where alkanolamines are oxidatively deteriorated causes elution of cations derived from anion exchange groups having an amino group, which increases impurities in the absorbing solution. There is. In addition, there is a possibility that a device such as a heat exchanger arranged on the absorption liquid circulation path is contaminated by the impurities and heat loss occurs.

  An object of this invention is to provide the carbon dioxide recovery apparatus which suppressed the heat loss.

  The carbon dioxide recovery device according to the present invention contacts an exhaust gas containing carbon dioxide with an absorption liquid that reversibly absorbs or releases carbon dioxide across a predetermined temperature, and absorbs the carbon dioxide in the exhaust gas into the absorption liquid. An absorber, a regenerator that heats the absorption liquid that has absorbed carbon dioxide in the absorber and releases carbon dioxide in the absorption liquid, and a reflux piping system that recirculates the absorption liquid regenerated in the regenerator to the absorber And a filter that introduces at least a part of the absorption liquid, removes the solid content accumulated in the introduced absorption liquid, and returns the absorption liquid after the removal of the solid content to the vicinity of the introduction position of the absorption liquid. A reheater that introduces and heats the absorption liquid from the bottom of the regenerator and returns the heated absorption liquid to the regenerator, and the filter is on the discharge path from the regenerator to the reheater. It is arranged.

  The said filter can be comprised with what hold | maintained the particulate filter medium with the mesh.

  A fine particle filter medium or mesh is preferably made of a nickel-based alloy.

  When the filter that holds the particulate filter medium with a mesh is made of a nickel-based alloy, the specific gravity is heavier than the solid content captured from the absorption liquid. It can be separated by the difference, the filter medium can be recovered, introduced again into the filter and used repeatedly.

  According to the present invention, it is possible to provide a carbon dioxide recovery device that suppresses heat loss.

It is a figure showing the composition of the carbon dioxide recovery device concerning a 1st embodiment. It is the figure which showed the structure of the carbon dioxide collection apparatus which concerns on 2nd Embodiment. It is the figure which showed the structure of the carbon dioxide collection apparatus which concerns on 3rd Embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(First embodiment)
As shown in FIG. 1, a carbon dioxide recovery apparatus 1 according to the first embodiment includes an absorber 101, an exhaust gas cooler 102, a heat exchanger 103, a regenerator 104, a reboiler 105 (reheater), and an absorption liquid cooling. A filter 106, a filter 107, a heat exchanger 108, a pump 109, a pump 110, and an exhaust gas cooler 111.

  Exhaust gas (treated gas) containing carbon dioxide derived from a coal combustion process in a power generation device (not shown) is introduced into the absorber 101 from the exhaust gas introduction path 201. The exhaust gas is subjected to treatments such as denitration, dust removal, desulfurization, and cooling, and is then introduced into the lower portion of the absorber 101 through the exhaust gas introduction path 201. The absorber 101 brings the exhaust gas to be introduced into contact with an absorption liquid that absorbs carbon dioxide, and causes the absorption liquid to absorb the carbon dioxide contained in the exhaust gas.

  The absorbing liquid is supplied from the upper part of the absorber 101 and is brought into countercurrent contact with the exhaust gas introduced from the lower part of the absorber 101. The exhaust gas after carbon dioxide is absorbed by the absorption liquid is discharged from the exhaust gas outlet path 202 above the absorber 101. The exhaust gas cooler 102 cools the exhaust gas discharged from the exhaust gas outlet path 202. A known technique may be used for the exhaust gas cooler 102.

  As the absorbing liquid, for example, an aqueous solution containing alkanolamine can be used, and the composition and type thereof are not particularly limited. The operating temperature of the absorber 101 may be arbitrarily set depending on the composition and type of the absorbing liquid and the degree of regeneration of the absorbing liquid. For example, the operating temperature of the internal absorbing liquid is in a range of about 30 ° C. to 70 ° C. To do. The absorbing liquid that has absorbed carbon dioxide contained in the exhaust gas by the absorber 101 is discharged from the absorbing liquid discharge path 203 and introduced into the upper part of the regenerator 104 by the pump 110.

  In the regenerator 104, the absorption liquid after carbon dioxide absorption introduced from the absorber 101 is heated to release carbon dioxide from the absorption liquid, thereby regenerating the absorption liquid. A reboiler 105 is used for heating the absorbent. The reboiler 105 heats the absorbent introduced into the regenerator 104 from the bottom through the absorbent introduction path 206. The absorption liquid after heating is returned to the regenerator 104 via the absorption liquid discharge path 207.

  The operating temperature of the regenerator 104 may be arbitrarily set based on the type and composition of the absorbing liquid, the amount of carbon dioxide retained in the absorbing liquid, etc., for example, so that the temperature of the absorbing liquid is in the range of 100 ° C. to 200 ° C. operate. A gas containing carbon dioxide (carbon dioxide-containing gas) released from the absorbing solution by heating is discharged from a carbon dioxide-containing gas discharge path 205 above the regenerator 104. The exhaust gas cooler 111 cools the carbon dioxide-containing gas discharged from the carbon dioxide-containing gas discharge path 205. A known technique may be used for the exhaust gas cooler 111.

  The absorbing liquid from which carbon dioxide has been released by the regenerator 104 is discharged from the absorbing liquid discharge path 204 and introduced into the upper portion of the absorber 101 by the pump 109. The absorption liquid cooler 106 cools the absorption liquid introduced into the absorber 101 via the absorption liquid discharge path 204 to an arbitrarily set temperature. The absorbing liquid introduced into the absorber 101 is reused as a carbon dioxide absorbing medium in the absorber 101.

  The heat exchanger 103 performs heat exchange between the absorbing liquid (low temperature) flowing through the absorbing liquid discharge path 203 and the absorbing liquid (high temperature) flowing through the absorbing liquid discharge path 204. That is, the heat exchanger 103 cools the absorbing liquid introduced into the absorber 101 and heats the absorbing liquid introduced into the regenerator 104.

  At least a part of the absorption liquid flowing through the absorption liquid introduction path 206 is introduced into the filter 107 as a liquid to be filtered through the absorption liquid introduction path 209. The exhaust gas introduced into the absorber 101 through the exhaust gas introduction path 201 is subjected to desulfurization treatment for dust removal by treatment of an electric dust collector or the like and removal of sulfur oxides before being introduced into the absorber 101. ing. However, a trace amount of dust removal and sulfur oxide components (trace components) remaining in these treatments are mixed in the exhaust gas, and a part of them accumulates in the absorption liquid. Further, various impurities such as oxidative degradation products of the absorbing solution and eluates from the structural material accumulate in the absorbing solution. Of the trace components and impurities accumulated in these absorbents, solids must be removed quickly because they may affect the heat exchangers and transportation equipment and change the properties of the absorbent. .

  The filter 107 removes solid content accumulated in the high-temperature absorption liquid operated at 100 ° C. to 200 ° C. by filtration. The absorption liquid whose solid content is filtered by the filter 107 is returned to the absorption liquid introduction path 206 via the absorption liquid discharge path 208. The filter 107 includes a hollow fiber membrane (separation membrane) made of a fluororesin. This hollow fiber membrane removes solids accumulated in the absorbent. The hollow fiber membrane made of a fluororesin is a material that can be used even in a high-temperature (in the temperature range) alkaline environment, such as a PTFE MF membrane.

  The temperature of the filter 107 is operated in accordance with the temperature of the absorbing liquid in the regenerator 104. It is desirable that the filtered absorbent discharged from the filter 107 is returned to a place where the temperature and carbon dioxide content are substantially the same as or close to those of the absorbent introduced via the absorbent introduction path 209.

  The heat exchanger 108 exchanges heat between backwash water flowing through the backwash water introduction path 210 into which backwash liquid for washing the heat exchanger 108 is introduced and backwash water flowing through the backwash water discharge path 211. I do. That is, the heat exchanger 108 heats the backwash water introduced into the filter 107 and cools the backwash water discharged from the filter 107.

  By providing the heat exchanger 108, it is possible to suppress heat loss of the absorbing liquid introduced from the absorbing liquid introduction path 209 into the filter 107. Two or more filter 107 are arranged in parallel, and when introducing backwash water into the filter 107, it is desirable to switch the introduction route.

  As described above, solid components out of trace components and impurities accumulated in the absorption liquid can be removed quickly because they may affect the heat exchanger and transportation equipment, change the absorption liquid characteristics, etc. There is a need. Since the carbon dioxide recovery device 1 according to the first embodiment includes the filter 107 that removes the solid content and removes the solid content, the heat exchanger 103 and the absorption liquid introduction / discharge route, Further, it is possible to suppress the contamination of the devices such as the absorption liquid cooler 106 and the pumps 109 and 110 arranged on these paths. Moreover, since contamination of an apparatus can be suppressed, the fall of the heat exchange efficiency in the heat exchanger 103, the reboiler 105, etc. can be suppressed.

  The temperature of the filter 107 is operated in accordance with the temperature of the absorption liquid in the regenerator 104, and the absorption liquid after filtration discharged from the filter 107 is absorbed into the absorption liquid introduced through the absorption liquid introduction path 209, and the temperature. Are returned to almost the same or close locations. For this reason, a solid substance can be removed in the state which suppressed the temperature fall of the absorption liquid, and a heat loss can be suppressed.

  The heat exchanger 108 performs heat exchange between the backwash water flowing through the backwash water introduction path 210 into which the backwash liquid for washing the heat exchanger 108 is introduced and the backwash water flowing through the backwash water discharge path 211. Therefore, in the backwashing process after filtration, the loss of the heat quantity possessed by the filter 107 can be suppressed.

  As described above, according to the carbon dioxide recovery device 1 according to the first embodiment, the solid content accumulated in the absorption liquid can be removed while suppressing heat loss. For this reason, it is possible to efficiently and appropriately recover carbon dioxide contained in the exhaust gas while suppressing the consumption of heat energy.

(Second Embodiment)
FIG. 2 is a diagram illustrating a configuration of the carbon dioxide recovery device 2 according to the second embodiment. Hereinafter, the configuration of the carbon dioxide recovery device 2 will be described with reference to FIG. The same components as those described in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

  The carbon dioxide recovery device 2 includes an absorber 101, an exhaust gas cooler 102, a heat exchanger 103, a regenerator 104, a reboiler 105 (reheater), an absorption liquid cooler 106, a filter 107A, a heat exchanger 108, and a pump 109. , A pump 110, an exhaust gas cooler 111, and a separator 112.

  The filter 107A includes a particulate filter medium that removes the solid content accumulated in the absorption liquid, and a mesh that surrounds the filter medium. The material of the filter medium and the mesh is a nickel-based alloy having excellent heat resistance and alkali resistance. In the second embodiment, the absorption liquid introduction path 209 and the backwash water introduction path 210 are arranged on the absorption liquid discharge path 203. Also in this case, the filtered absorbent discharged from the filter 107A can be returned to a place where the temperature and carbon dioxide content are substantially the same as or close to those of the absorbent introduced via the absorbent introduction path 209. desirable.

  The separator 112 separates the solid matter and the particulate filter medium contained in the backwash water introduced via the backwash water discharge path 211 when the filter 107A is backwashed. A filter medium made of a nickel-based alloy has a higher specific gravity than a solid content, and therefore is separated by a separator 112 that is a solid-liquid separator. The filter medium separated by the separator 112 is recovered, and the filter 107A is configured again in the filter 107A via the filter medium circulation path 212 and repeatedly used.

  As described above, in the second embodiment, the absorption liquid introduction path 209 and the backwash water introduction path 210 are arranged on the absorption liquid discharge path 203. In this way, the filtration target in the filter 107A is the absorption liquid that has absorbed carbon dioxide, and the solid content accumulated in the absorption liquid is quickly removed from the exhaust gas. For this reason, it is possible to suppress the fouling of devices such as the pump 110 disposed on the absorption liquid discharge path 203, the heat exchanger 103, and the absorption liquid discharge path 203.

  The filter medium contained in the backwash liquid discharged from the filter 107A is separated and recovered by the separator 112. For this reason, the filter medium separated and recovered by the separator 112 can be reused, and the amount of waste generated can be suppressed.

  As described above, according to the carbon dioxide recovery device 2 according to the second embodiment, the solid content, which is an impurity, diffuses throughout the carbon dioxide recovery device 2 by quickly removing the solid content contained in the exhaust gas. It is possible to suppress the contamination of the equipment by suppressing. For this reason, it is possible to efficiently and appropriately recover carbon dioxide contained in the exhaust gas while suppressing the consumption of heat energy. Furthermore, the amount of waste generated can be suppressed by reusing the filter medium used for removing the solid content.

(Third embodiment)
FIG. 3 is a diagram illustrating a configuration of the carbon dioxide recovery device 3 according to the third embodiment. Hereinafter, the configuration of the carbon dioxide recovery device 3 will be described with reference to FIG. 3. The same components as those described in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

  The carbon dioxide recovery device 3 according to the third embodiment includes an absorber 101, an exhaust gas cooler 102, a heat exchanger 103, a regenerator 104, a reboiler 105 (reheater), an absorption liquid cooler 106, a filter 107, A heat exchanger 108, a pump 109, a pump 110, an exhaust gas cooler 111, an oxygen supply unit 113, and a deoxygenation unit 114 are provided.

  The oxygen supply unit 113 supplies oxygen-containing gas (oxygen-containing gas) to the absorption liquid flowing through the absorption liquid introduction path 209 via the oxygen-containing gas supply path 214. For the oxygen supply to the absorbing solution by the oxygen supply unit 113, a technique for promoting gas dissolution, such as a line mixer or fine bubbles (for example, a microbubble generator) may be used.

  The deoxygenation unit 114 is disposed downstream of the filter 107 and removes oxygen contained in the filtered absorbent discharged from the filter 107. For removal of oxygen in the deoxygenation unit 114, a known deoxygenation technique that has a small influence on the absorption liquid composition, such as a replacement treatment with an inert gas, a decompression operation in the tank, or a gas separation membrane, may be used. The absorption liquid from which oxygen contained in the deoxygenation unit 114 has been removed is returned to the absorption liquid discharge path 204 via the deoxygen filtrate discharge path 215.

  The impurities accumulated in the absorption liquid include a small amount of dust contained in the exhaust gas introduced from the exhaust gas introduction path 201, a sulfur oxide component, and an organic acid generated by the operation of the carbon dioxide recovery device 3 using the absorption liquid. And eluate from structural materials. This organic acid is produced by oxidative decomposition of the absorbing solution by metal ions mainly composed of oxygen contained in the exhaust gas and iron ions eluted from the structural material.

  It is known that iron ions accelerate the oxidative decomposition of the absorbing solution in the presence of oxygen. By quickly removing the iron ions, it is possible to expect the degradation product produced by the oxidative decomposition of the absorption liquid and the increase in the consumption of the absorption liquid, and the maintenance of the absorption liquid composition. For this reason, the carbon dioxide recovery device 3 according to the third embodiment supplies oxygen-containing gas into the absorption liquid from the oxygen supply unit 113, and improves the oxygen partial pressure in the system, thereby oxidizing iron ions. Iron formation is promoted, and the formed iron oxide is removed by a subsequent filter 107.

  Impurities derived from iron ions that have become iron oxide (solid matter) by supplying oxygen are removed by the filter 107, and the iron ion concentration in the absorbing solution is reduced. For this reason, deterioration due to oxidation of the absorbent can be suppressed.

  Further, in the third embodiment, the absorption liquid introduction path 209 and the deoxygen filtrate discharge path 215 are arranged in the absorption liquid discharge path 204 downstream of the heat exchanger 103. Since the temperature of the absorbent flowing in the subsequent stage of the heat exchanger 103 is lower than the temperature of the absorbent in the regenerator 104, it is suitable for dissolving the oxygen-containing gas. Further, the carbon dioxide-containing gas discharged from the regenerator 104 through the carbon dioxide-containing gas discharge path 205 is mixed with the carbon dioxide-absorbed absorbing liquid or the case where the absorbent is disposed on the path circulating in the regenerator 104. The amount of oxygen can be suppressed.

  As in the first embodiment, the absorption liquid after filtration discharged from the filter 107 has substantially the same temperature and carbon dioxide content as the absorption liquid introduced via the absorption liquid introduction path 209. It is desirable to return it to a nearby location.

  As described above, according to the carbon dioxide recovery device 3 according to the third embodiment, the solid content contained in the exhaust gas is removed and the iron ion content generated in the system is removed, thereby Deterioration, generation of impurities accompanying it, and consumption of absorbing liquid can be suppressed. Moreover, by removing solid content and iron ions contained in the exhaust gas promptly, it is possible to suppress impurities from diffusing throughout the carbon dioxide recovery device 3 and to suppress the contamination of the equipment. For this reason, it is possible to efficiently and appropriately recover carbon dioxide contained in the exhaust gas while suppressing the consumption of heat energy.

(Other embodiments)
Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

  Specifically, the filter 107 included in the carbon dioxide recovery device 1 according to the first embodiment or the carbon dioxide recovery device 3 according to the third embodiment is replaced with the filter 107A included in the second embodiment. It may be changed. At this time, the oxygen supply unit 113 may be arranged at the rear stage of the filter 107A. Moreover, you may change the arrangement position of the filter 107 or the filter 107 which the carbon dioxide collection apparatus 1 thru | or the carbon dioxide collection apparatus 3 which concern on the 1st thru | or 3rd embodiment comprises in the arrangement position in other embodiment. .

  DESCRIPTION OF SYMBOLS 1-3 ... Carbon dioxide recovery apparatus, 101 ... Absorber, 102, 111 ... Exhaust gas cooler, 103 ... Heat exchanger, 104 ... Regenerator, 105 ... Reboiler (reheater), 106 ... Absorbent liquid cooler, 107 DESCRIPTION OF SYMBOLS ... Filter, 108 ... Heat exchanger, 109, 110 ... Pump, 112 ... Separator, 113 ... Oxygen supply part, 114 ... Deoxygenation part, 201 ... Exhaust gas introduction path, 202 ... Exhaust gas extraction path, 203 ... Absorption liquid discharge 204, Absorption liquid discharge path, 205 ... Carbon dioxide containing gas discharge path, 206 ... Absorption liquid introduction path, 207 ... Absorption liquid discharge path, 208 ... Absorption liquid discharge path, 209 ... Absorption liquid introduction path, 210 ... Backwash Water introduction path, 211 ... backwash water discharge path, 212 ... filter medium circulation path, 213 ... solid content discharge path, 214 ... oxygen-containing gas supply path, 215 ... deoxygenated filtrate discharge path.

Claims (8)

An absorber that makes the absorption liquid absorb carbon dioxide in the exhaust gas by contacting an exhaust gas containing carbon dioxide with an absorption liquid that reversibly absorbs or releases carbon dioxide across a predetermined temperature;
A regenerator that heats the absorption liquid that has absorbed carbon dioxide in the absorber to release carbon dioxide in the absorption liquid;
A reflux piping system for refluxing the absorbent regenerated by the regenerator to the absorber;
A filter that introduces at least a part of the absorbent, removes solids accumulated in the introduced absorbent, and returns the absorbent after removal of the solids to the vicinity of the place where the absorbent is introduced. When,
A reheater that introduces and heats the absorbent from the bottom of the regenerator and returns the heated absorbent to the regenerator;
Comprising
The carbon dioxide recovery device, wherein the filter is disposed on a discharge path from the regenerator to the reheater.   The carbon dioxide recovery device according to claim 1, wherein the filter is formed by holding a particulate filter medium with a mesh.   The carbon dioxide recovery device according to claim 2, wherein the filter medium and the mesh are nickel-based alloys.   The carbon dioxide recovery apparatus according to claim 2 or 3, further comprising a separator for separating the solid content and the filter medium, and reusing the filter medium separated by the separator.   5. The heat exchanger according to claim 1, further comprising a heat exchanger for exchanging heat with each of the backwashing liquids flowing through the backwashing liquid introduction path and the discharge path for washing the filter. The carbon dioxide recovery device according to any one of claims.   The carbon dioxide recovery according to any one of claims 1 to 5, further comprising an oxygen supply unit that supplies a gas containing oxygen to the absorption liquid introduced into the filter. apparatus.   The carbon dioxide recovery apparatus according to any one of claims 1 to 6, further comprising a deoxygenation unit that removes oxygen contained in the absorption liquid discharged from the filter.   The carbon dioxide recovery device according to any one of claims 1 to 7, wherein at least two or more of the filters are arranged in parallel.

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