JP2018176027A - Carbon dioxide recovery system and operating method of carbon dioxide recovery system - Google Patents

Abstract

A carbon dioxide recovery system capable of reducing the carbon dioxide content of an absorbing liquid discharged from a regenerator and improving the carbon dioxide recovery performance is provided. A carbon dioxide recovery system according to an embodiment includes an absorption device and a regeneration device. The regeneration device 30 includes a regeneration storage unit 40 that stores the absorbing liquids 4 and 5, an introduction port 41, an outlet port 42, and a partition member 43. The partition member 43 partitions the regeneration storage section 40 into an upstream space 44 formed on the inlet 41 side and a downstream space 45 formed on the outlet 42 side. The partition member 43 includes an opening 47 through which the absorption liquids 4 and 5 from the upstream space 44 toward the downstream space 45 pass. A heating unit 48 for heating the absorbing liquids 4 and 5 is provided in the upstream space 44. [Selection] Figure 1

Description

  An embodiment of the present invention relates to a carbon dioxide recovery system and a method of operating a carbon dioxide recovery system.

In recent years, Carbon Dioxide Capture and Storage (CCS), which collects and stores carbon dioxide (CO ₂ ), has attracted attention as an effective countermeasure against the global warming problem. Specifically, a carbon dioxide recovery system has been studied in which carbon dioxide in process exhaust gas (treatment target exhaust gas) discharged from thermal power plants, steel mills, cleaning plants and the like is recovered using an absorbent.

  As one of the carbon dioxide recovery and storage techniques, a carbon dioxide recovery system by a chemical absorption method is known. Such a carbon dioxide recovery system includes an absorber and a regenerator. Among them, in the absorber, carbon dioxide contained in the process exhaust gas is absorbed into an absorbent containing an absorbent component such as an amine and water. At this time, the process exhaust gas from which the carbon dioxide has been released is discharged from the absorber. The absorbing solution that has absorbed carbon dioxide is supplied to the regenerator, and carbon dioxide is released from the absorbing solution in the regenerator. At this time, the carbon dioxide released from the regenerating apparatus is discharged together with the steam, and the carbon dioxide is separated and recovered. The absorbing liquid that has released carbon dioxide in the regenerator is returned to the absorber and absorbs carbon dioxide again in the absorber. In this way, the absorbent circulates through the absorber and the regenerator, and carbon dioxide contained in the process exhaust gas is continuously recovered.

  As described above, in the regenerating apparatus, the absorbing solution is heated to release carbon dioxide from the absorbing solution that has absorbed carbon dioxide. As a method of heating the absorbing liquid, a method of heating the absorbing liquid using steam, a method of electrically heating the absorbing liquid using a heater, and the like can be mentioned according to the required heat amount. If the amount of absorption liquid to be heated is small, if a large amount of heat is not required to heat, or if the installation space is limited, the heater should be used to simplify the configuration of the carbon dioxide recovery system. The method used may be employed. In this case, the heater is provided in a container storing the absorbing liquid.

  However, the amount of heat output from the heater is generally small. This weakens the convection generated in the absorbing liquid in the container and makes it difficult to effectively heat the absorbing liquid. For this reason, uneven distribution of heat occurs in the absorbing liquid in the container, and the absorbing liquid may be discharged from the regenerating apparatus without being sufficiently heated. There is a problem that a relatively large amount of carbon dioxide remains in the absorbing solution which is not sufficiently heated, and the carbon dioxide content of the absorbing solution discharged from the regenerator increases. In this case, the carbon dioxide recovery performance may be reduced.

JP 2004-323339 A

  The present invention has been made in consideration of such points, and it is possible to reduce the carbon dioxide content of the absorbent discharged from the regenerator and to improve the carbon dioxide recovery performance. An object of the present invention is to provide a carbon recovery system and a method of operating a carbon dioxide recovery system.

  The carbon dioxide recovery system according to the embodiment includes an absorber for absorbing carbon dioxide contained in the exhaust gas to be treated into the absorbent, and a regenerator for releasing carbon dioxide from the absorbent supplied from the absorber. There is. The regenerating apparatus has a regeneration storage section for storing the absorption liquid, an inlet for introducing the absorption liquid into the regeneration storage section, an outlet for drawing the absorption liquid from the regeneration storage section, and a dividing member. The partitioning member partitions the regeneration storage section into an upstream space formed on the side of the inlet and a downstream space formed on the side of the outlet. The partitioning member includes an opening through which the absorbing liquid passes from the upstream space to the downstream space. The upstream space is provided with a heating unit for heating the absorbing liquid.

  Further, in the operating method of the carbon dioxide recovery system according to the embodiment, an absorbing device for absorbing carbon dioxide contained in the exhaust gas to be treated into an absorbing liquid, and a regeneration device for releasing carbon dioxide from the absorbing liquid supplied from the absorbing device And a method of operating a carbon dioxide recovery system. The operating method of this carbon dioxide recovery system introduces the absorbent supplied from the absorber into the upstream space partitioned by the partitioning member in the regeneration storage section of the regeneration device from the inlet of the regeneration device. The absorbent introduced into the upstream space is heated. The heated absorbing liquid passes through the opening of the dividing member and flows into the downstream space of the regeneration reservoir divided by the dividing member. The absorbent flowing into the downstream space is drawn out from the outlet.

  According to the present invention, the carbon dioxide content of the absorbent discharged from the regenerating apparatus can be reduced, and the carbon dioxide recovery performance can be improved.

FIG. 1 is a diagram showing an entire configuration of a carbon dioxide recovery system according to a first embodiment. FIG. 2 is a view showing a regeneration device in the carbon dioxide recovery system according to the second embodiment. FIG. 3 is a view for explaining the introduction direction of the absorbing liquid in the regenerating apparatus of FIG. FIG. 4 is a view for explaining the introduction direction of the absorbing liquid in the regenerating apparatus of FIG. FIG. 5 is a view showing a regeneration device in the carbon dioxide recovery system in the third embodiment. FIG. 6 is a diagram showing a regeneration device in the carbon dioxide recovery system according to the fourth embodiment.

  Hereinafter, with reference to the drawings, a carbon dioxide recovery system and a method of operating the carbon dioxide recovery system according to an embodiment of the present invention will be described.

First Embodiment
First, with reference to FIG. 1, an operation method of the carbon dioxide recovery system and the carbon dioxide recovery system in the first embodiment will be described.

  As shown in FIG. 1, the carbon dioxide recovery system 1 is an absorber 20 (absorber) that absorbs carbon dioxide contained in the process exhaust gas 2 (treatment target exhaust gas) into an absorbent containing water (lean liquid 5). And a regenerating apparatus 30 for regenerating the rich liquid 4 by releasing carbon dioxide from the absorbing liquid (rich liquid 4) that has absorbed carbon dioxide supplied from the absorbing apparatus 20. Among them, the process exhaust gas 2 in which carbon dioxide is absorbed in the lean solution 5 in the absorber 20 is discharged from the absorber 20 as the absorber exhaust gas 3. Further, carbon dioxide is discharged from the regenerating apparatus 30 together with the steam as regenerating apparatus exhaust gas 8. The process exhaust gas 2 supplied to the absorption device 20 is not particularly limited, but can be, for example, an exhaust gas discharged from a thermal power plant, an iron mill, a cleaning plant, or the like. Such exhaust gas is supplied to the absorber 20 by a fan (not shown).

  The absorber 20 and the regenerator 30 are connected by a rich liquid line L1 and a lean liquid line L2. Among them, the rich liquid line L1 supplies the rich liquid 4 discharged from the absorbing device 20 to the regenerating device 30. The lean fluid line L2 supplies the lean fluid 5 discharged from the regenerator 30 to the absorber 20. The absorbing liquids 4 and 5 circulate the absorbing device 20 and the regenerating apparatus 30 through the rich liquid line L1 and the lean liquid line L2, and absorb carbon dioxide in the absorbing apparatus 20 to become the rich liquid 4, and carbon dioxide in the regenerating apparatus 30 To a lean solution 5. In addition, although amine aqueous solutions, such as monoethanolamine (monoethanolamin) and diethanolamine (diethanolamin), can be used suitably for absorption liquid, for example, it is not limited to the kind of such an amine. Moreover, you may be comprised by the aqueous solution containing 1 or more types of amines.

  The absorbing device 20 has an absorbing portion 20 a (a packed bed or tray) accommodated in the absorbing device 20. The absorbing unit 20 a is configured as a countercurrent gas-liquid contact device, brings the process exhaust gas 2 and the lean liquid 5 into contact with each other, and causes the lean liquid 5 to absorb carbon dioxide contained in the process exhaust gas 2. More specifically, the process exhaust gas 2 supplied to the lower part of the absorber 20 ascends in the absorber 20a. On the other hand, the lean solution 5 from the regenerating apparatus 30 disperses and falls in the absorbing portion 20a. In the absorbing section 20a, the process exhaust gas 2 and the lean solution 5 are brought into gas-liquid contact, and carbon dioxide contained in the process exhaust gas 2 is absorbed by the lean solution 5 and the rich solution 4 is generated.

  The generated rich liquid 4 is discharged from the bottom of the absorber 20 to the rich liquid line L1. Carbon dioxide is removed from the process exhaust gas 2 in gas-liquid contact with the lean solution 5, and the exhaust gas is discharged from the absorber 20 a as the absorber exhaust gas 3, rises inside the absorber 20, and is discharged from the top of the absorber 20.

  A regenerative heat exchanger 31 is provided between the absorber 20 and the regenerator 30. The regenerative heat exchanger 31 is configured to exchange heat between the rich liquid 4 passing through the rich liquid line L1 and the lean liquid 5 passing through the lean liquid line L2. As a result, the lean solution 5 serves as a heat source, and the rich solution 4 is heated to a desired temperature. In other words, the rich solution 4 serves as a cold heat source, and the lean solution 5 is cooled to a desired temperature.

  A rich liquid pump 32 is provided in the rich liquid line L1. The rich solution 4 discharged from the absorption device 20 by the rich solution pump 32 is supplied to the regeneration device 30 via the regeneration heat exchanger 31.

  A lean fluid pump 34 is provided in the lean fluid line L2. The lean solution 5 discharged from the regenerator 30 by the lean solution pump 34 is supplied to the absorber 20 via the regeneration heat exchanger 31. As described above, the regenerative heat exchanger 31 cools the lean fluid 5 passing through the lean fluid line L2 by heat exchange with the rich fluid 4 passing through the rich fluid line L1. Further, the lean liquid line L2 is provided with a lean liquid cooler 35 for cooling the lean liquid 5 supplied from the regenerator 30 (more specifically, the regenerative heat exchanger 31) to the absorber 20. A coolant such as cooling water is supplied from the outside to the cooler 35 for the lean solution, and the cooler 35 for the lean solution further cools the lean solution 5 cooled in the regenerative heat exchanger 31 to a desired temperature. .

  The lean solution 5 cooled by the lean solution cooler 35 is supplied to the absorbing unit 20 a of the absorbing device 20. In the absorbing portion 20 a, the lean solution 5 is brought into gas-liquid contact with the process exhaust gas 2, and carbon dioxide contained in the process exhaust gas 2 is absorbed by the lean solution 5 and becomes the rich solution 4. In this manner, in the carbon dioxide recovery system 1, the absorbing liquid is circulated while repeating a state in which the lean liquid 5 having a relatively low carbon dioxide concentration and a state in which the rich liquid 4 having a relatively high carbon dioxide concentration are obtained. It is supposed to be.

  The carbon dioxide recovery system 1 in the present embodiment further includes an exhaust gas cooler 36 for cooling the regeneration device exhaust gas 8. A cooling medium such as cooling water is supplied from the outside to the exhaust gas cooler 36, and the exhaust gas cooler 36 cools the regeneration device exhaust gas 8 discharged from the regeneration device 30. The cooled regenerator exhaust gas 8 is recovered by a recovery facility (not shown).

  As described above, the regenerating apparatus 30 is an apparatus for releasing carbon dioxide from the rich liquid 4 supplied from the absorbing apparatus 20 and converting the rich liquid 4 into the lean liquid 5 to regenerate the absorbing liquid. In the present embodiment, a reboiler for heating the rich liquid 4 supplied to the regenerating apparatus 30 is not provided. The reboiler heats a part of the lean solution 5 discharged from the regenerator 30 with a heating medium supplied from the outside to generate steam from the lean solution 5 and supplies the generated steam to the regenerator 30. belongs to. On the other hand, in the present embodiment, the regenerating apparatus 30 is configured to heat the stored rich liquid 4 by the heater 48 described later. In such a regeneration device 30, for example, when the amount of the rich liquid 4 to be heated is small or the amount of heat required for heating is not so large, the installation space of the carbon dioxide recovery system 1 is limited. In some cases, it is suitably used. The playback device 30 will be described in more detail below.

  The regeneration device 30 includes a regeneration tank 40 (regeneration storage unit) for storing the rich solution 4, an inlet 41 for introducing the rich solution 4 into the regeneration tank 40, and an outlet 42 for extracting the lean solution 5 from the regeneration tank 40. ,have. The regeneration device 30 according to the present embodiment may be referred to as a flash drum or a flash tank in order to release carbon dioxide from the rich liquid 4 supplied from the absorption device 20.

  The regeneration tank 40 is partitioned into an upstream space 44 and a downstream space 45 by a tubular partitioning member 43. The upstream space 44 is a space formed on the side (upstream side) of the inlet 41 in the regeneration tank 40. The downstream side space 45 is a space formed on the side (downstream side) of the outlet 42 in the regeneration tank 40, and is formed on the downstream side of the upstream side space 44.

  In the present embodiment, the dividing member 43 extends in the vertical direction, and the lower portion of the dividing member 43 protrudes downward from the bottom of the regeneration tank 40 and forms a protrusion 46.

  The upstream space 44 is a space formed inside the dividing member 43 and is a space in which the inlet 41 is disposed. The inlet 41 is disposed at the lower portion (more specifically, the protrusion 46) of the dividing member 43. The rich liquid line L1 is connected to the inlet 41, and the rich liquid 4 discharged from the regenerative heat exchanger 31 is supplied. The inlet 41 is configured such that the discharge direction of the rich liquid 4 is in a direction (horizontal direction) orthogonal to the axial direction (vertical direction) of the dividing member 43. Further, when viewed from above, the inlet 41 may discharge the rich liquid 4 toward the vicinity of the center 44 O (see FIGS. 3 and 4) of the upstream space 44. For example, the inlet 41 can be formed as a member having a predetermined flow path length in order to discharge the rich liquid 4 in a predetermined direction.

  In the upstream side space 44, the rich solution 4 introduced from the inlet 41 rises, and the rich solution 4 is heated by a heater 48 described later, and the temperature of the rich solution 4 is raised. As a result, carbon dioxide is released from the rich liquid 4 in the upstream side space 44, and the rich liquid 4 becomes the lean liquid 5. In the present embodiment, for the sake of convenience, the rich liquid 4 will be described as being the lean liquid 5 by releasing carbon dioxide in the upstream space 44. The released carbon dioxide is discharged from the top of the regeneration tank 40 as the regenerator exhaust gas 8 together with the steam.

  The partitioning member 43 includes an opening 47 through which the lean fluid 5 passes from the upstream space 44 toward the downstream space 45. The opening 47 is disposed at the downstream end (upper end) of the dividing member 43. As a result, the lean solution 5 having risen in the upstream space 44 passes through the opening 47 and flows into the downstream space 45.

  The downstream side space 45 is a space formed outside the dividing member 43 and is a space in which the outlet 42 is disposed. The outlet 42 is disposed at the bottom of the regeneration tank 40 outside the dividing member 43. As a result, in the downstream space 45, the lean liquid 5 flowing from the upstream space 44 descends toward the outlet 42 and is discharged from the outlet 42. A lean fluid line L2 is connected to the outlet port 42, and the lean fluid 5 thus delivered is supplied to the regenerative heat exchanger 31.

  In the present embodiment, the downstream space 45 is formed around the entire circumference of the upstream space 44 (or the partitioning member 43). That is, the regeneration tank 40 and the dividing member 43 are formed in a cylindrical shape, and the dividing member 43 is disposed concentrically with the regeneration tank 40. As a result, the downstream space 45 is uniformly formed around the upstream space 44.

  As shown in FIG. 1, the upstream space 44 is provided with a heater 48 (heating unit) for heating the rich solution 4. The heater 48 has a heater main body 49 that heats the rich liquid 4 in contact with the rich liquid 4, and a heater attachment portion 50 that supports the heater main body 49 and that is attached to the regeneration tank 40. In the present embodiment, the heater main body 49 is inserted into the upstream space 44, and the heater attachment portion 50 is attached to the projection 46 opening 47 of the dividing member 43. The heater 48 is preferably an electric heater, and the rich liquid 4 may be heated directly, or the rich liquid 4 may be indirectly heated via a medium such as oil. . Alternatively, the heater 48 may be a heater that heats the rich liquid 4 using high temperature steam instead of an electric heater. Further, the heater 48 is a cylindrical heater in which the heater main body 49 is formed in a tubular shape, a coil type heater formed in a coil, a flange heater in which the heater attachment portion 50 is a flange type, or the heater attachment portion 50. The screw heater may be a screw-in type. Furthermore, the heater 48 may be a throwing type heater inserted into the space from the top of the regeneration tank 40 to the upstream side.

  Next, the operation of the present embodiment having such a configuration, that is, the operation method of the carbon dioxide recovery system will be described.

  While operating the carbon dioxide recovery system 1, as shown in FIG. 1, the rich liquid 4 discharged from the absorption device 20 to the rich liquid line L1 is regenerated by the discharge force of the rich liquid pump 32. It passes through 31 and is supplied to the reproduction device 30.

  The rich solution 4 supplied to the regeneration device 30 is introduced into the upstream space 44 of the regeneration tank 40 from the inlet 41 of the regeneration device 30. When the rich solution 4 is introduced into the upstream space 44, the inside of the upstream space 44 is raised by the discharge force of the rich solution pump 32.

  The rich liquid 4 is heated by the heater main body 49 of the heater 48 provided in the upstream space 44 while rising in the upstream space 44, and the temperature of the rich liquid 4 is raised. Then, the carbon dioxide absorbed in the rich solution 4 turns into a gas and is released from the rich solution 4, and the rich solution 4 becomes a lean solution 5. On the other hand, the released carbon dioxide rises as air bubbles in the absorbing liquids 4 and 5 and passes through the liquid surface of the absorbing liquids 4 and 5 and is separated from the absorbing liquids 4 and 5. The separated carbon dioxide is discharged from the upper portion of the regeneration tank 40 as the regeneration device exhaust gas 8 together with the vapor evaporated from the moisture of the absorbents 4 and 5.

  The lean solution 5 heated in the upstream space 44 of the regeneration tank 40 passes through the opening 47 of the dividing member 43 and flows into the downstream space 45. In the downstream space 45, the lean solution 5 descends and is derived from the outlet 42 provided at the bottom of the regeneration tank 40. Thus, the lean fluid 5 is discharged from the regenerating apparatus 30 to the lean fluid line L2.

  The lean solution 5 discharged to the lean solution line L2 is supplied to the absorbing device 20 through the regenerative heat exchanger 31 and the lean solution cooler 35 by the discharge force of the lean solution pump 34.

  As described above, according to the present embodiment, the regeneration tank 40 of the regeneration device 30 is partitioned by the partitioning member 43 by the upstream space 44 and the downstream space 45, and the rich liquid 4 is heated in the upstream space 44. A heater 48 is provided. As a result, the rich liquid 4 introduced into the upstream space 44 can flow in the vicinity of the heater 48, and the rich liquid 4 is effectively heated by the heater 48 to efficiently release carbon dioxide. it can. Therefore, the rich liquid 4 introduced into the regeneration tank 40 can be prevented from being led out from the outlet 42 while the heating is insufficient, and the carbon dioxide content of the lean liquid 5 discharged from the regeneration device 30 can be reduced. It can be reduced. As a result, the carbon dioxide recovery performance can be improved.

  Further, according to the present embodiment, the dividing member 43 extends in the vertical direction. As a result, the upstream space 44 can be a space extending in the vertical direction, and the bubbles of carbon dioxide released from the rich liquid 4 can be smoothly raised. Can be separated efficiently.

  Further, according to the present embodiment, the downstream space 45 of the regeneration tank 40 is formed around the dividing member 43. As a result, the lean solution 5 which has risen the upstream space 44 and has passed through the opening 47 of the partitioning member 43 can smoothly flow into the downstream space 45 provided around the upstream space 44. Therefore, the flow of the rich liquid 4 in the upstream side space 44 can be prevented from being biased in the direction (horizontal direction) orthogonal to the axial direction of the dividing member 43, and the heating efficiency of the rich liquid 4 can be improved. As a result, carbon dioxide from the rich solution 4 can be released more efficiently. In particular, according to the present embodiment, the regeneration tank 40 and the dividing member 43 are formed in a cylindrical shape, and the dividing member 43 is disposed concentrically with the regeneration tank 40. As a result, the downstream space 45 can be uniformly formed around the upstream space 44. Therefore, the flow of the rich liquid 4 in the upstream space 44 can be further prevented from being biased.

  In the above-described embodiment, the example in which the outlet 42 is disposed outside the dividing member 43 in the bottom of the regeneration tank 40 has been described. However, the present invention is not limited to this, and the position of the outlet 42 is arbitrary as long as the lean solution 5 can be derived from the downstream space 45.

  Further, in the above-described embodiment, the example in which the dividing member 43 extends in the vertical direction has been described. However, the present invention is not limited to this, and if the dividing member 43 can raise the bubbles of carbon dioxide released from the rich liquid 4 and separate it from the absorbing liquids 4 and 5, the extending direction of the dividing member 43 is It is optional.

  Further, in the above-described embodiment, the example in which the regeneration tank 40 and the partitioning member 43 are formed in a cylindrical shape and the partitioning member 43 is disposed concentrically with the regeneration tank 40 has been described. However, the present invention is not limited to this, and the shapes of the regeneration tank 40 and the partition member 43 are arbitrary. Further, the dividing member 43 may be eccentric to the regeneration tank 40.

  Further, in the above-described embodiment, the downstream space 45 of the regeneration tank 40 is formed around the dividing member 43. However, the present invention is not limited to this, and the downstream space 45 may be formed in a part of the periphery of the dividing member 43.

Second Embodiment
Next, a carbon dioxide recovery system and a method of operating the carbon dioxide recovery system according to the second embodiment of the present invention will be described with reference to FIGS.

  In the second embodiment shown in FIG. 2 to FIG. 4, the point that the absorbing liquid flows as a swirling flow in the upstream space of the regeneration tank is mainly different, and the other configuration is the first shown in FIG. Is substantially the same as the embodiment of FIG. In FIGS. 2 to 4, the same parts as those of the first embodiment shown in FIG.

  In the present embodiment, as shown in FIG. 2, the rich solution 4 flows as a swirling flow in the upstream space 44 of the regeneration tank 40. More specifically, as shown in FIG. 2, the inlet 41 of the regeneration tank 40 mixes the rich liquid 4 into the upstream space 44 so that the rich liquid 4 flows as a swirl flow in the upstream space 44. It is configured to be introduced. For example, as shown in FIG. 3, the inlet 41 discharges the rich solution 4 from the center 44 O of the upstream space 44 toward the eccentric position when viewed from above. In FIG. 3, an example in which the inlet 41 is configured to introduce the rich liquid 4 in a direction oblique to the radial direction of the upstream space 44 is shown.

  In the present embodiment, the rich liquid 4 from the inlet 41 is discharged toward the eccentric position from the center 44O of the upstream space 44 when viewed from above. Then, the rich liquid 4 ascends along the inner surface of the dividing member 43 around the center 44 O of the upstream space 44. During this time, the rich solution 4 is heated by the heater main body 49 of the heater 48, carbon dioxide is released from the rich solution 4, and becomes the lean solution 5. The lean solution 5 rises while swirling in the upstream space 44, passes through the opening 47 and flows into the downstream space 45.

  Thus, according to the present embodiment, in the upstream space 44, the rich liquid 4 is introduced into the upstream space 44 so as to flow as a swirling flow. By this, the rich liquid 4 in the upstream side space 44 can rise while swirling, and the rich liquid 4 can be uniformly heated, and the heating time of the rich liquid 4 and the heater main body 49 of the heater 48 can be increased. Can be made longer. Therefore, carbon dioxide can be released from the rich solution 4 more efficiently. As a result, the carbon dioxide content of the lean liquid 5 discharged from the regeneration device 30 can be further reduced.

  In the above-described embodiment, an example where the inlet 41 introduces the rich liquid 4 into the upstream space 44 so that the rich liquid 4 flows as a swirl flow in the upstream space 44 explained. However, this is not restrictive. For example, as shown in FIG. 4, in the upstream side space 44, a straightening plate 60 (straightening member) that changes the flow direction of the rich liquid 4 so that the rich liquid 4 flows as a swirl flow in the upstream side space 44 is It may be provided. More specifically, as shown in FIG. 4, the inlet 41 discharges the rich liquid 4 toward the vicinity of the center 44 O of the upstream space 44 when viewed from above. Between the port 41 and the center 44 O of the upstream space 44, a straightening vane 60 is disposed. The straightening vane 60 extends in a direction oblique to the radial direction of the upstream space 44, and changes the flow direction of the rich liquid 4 discharged from the inlet 41 to a direction oblique to the radial direction. In this manner, the rich liquid 4 introduced into the upstream space 44 may flow along the inner surface of the dividing member 43 so as to flow around the center 44 O of the upstream space 44 when viewed from above. it can.

Third Embodiment
Next, a carbon dioxide recovery system and a method of operating the carbon dioxide recovery system according to the third embodiment of the present invention will be described with reference to FIG.

  In the third embodiment shown in FIG. 5, the partitioning member is provided with a suction port for sucking the absorbing liquid in the downstream space to the upstream space on the opposite side of the opening from the inlet. The other points are the same as those of the first embodiment shown in FIG. In FIG. 5, the same parts as those of the first embodiment shown in FIG. 1 are designated by the same reference numerals and their detailed description will be omitted.

  In the present embodiment, as shown in FIG. 5, the partitioning member 43 is provided with a suction port 61 for sucking the lean liquid 5 in the downstream space 45 into the upstream space 44. The suction port 61 is disposed on the side opposite to the side of the opening 47 with respect to the inlet 41. In the embodiment shown in FIG. 5, the suction port 61 is disposed below the introduction port 41, and the suction port 61 is configured as an opening formed in the dividing member 43. The shape, opening area, and number of the suction ports 61 can be arbitrarily set according to the suction amount of the lean solution 5, the capacity of the upstream space 44 of the regeneration tank 40, the capacity of the downstream space 45, and the like.

  In FIG. 5, the projecting portion 46 as shown in FIG. 1 and the like is not formed, and the partitioning member 43 is disposed inside the regeneration tank 40. Then, in the downstream side space 45, a rich liquid pipe 62 connecting the rich liquid line L1 and the introduction port 41 is inserted.

  In the present embodiment, the rich liquid 4 introduced into the upstream space 44 from the inlet 41 rises in the upstream space 44. At this time, the lean solution 5 in the downstream space 45 is sucked into the upstream space 44 from the suction port 61 provided below the introduction port 41 so as to be caught in the upward flow of the rich liquid 4. The aspirated lean solution 5 ascends in the upstream space 44 together with the rich solution 4 introduced from the inlet 41. During this time, the rich solution 4 and the lean solution 5 are heated by the heater main body 49 of the heater 48, and the rich solution 4 releases carbon dioxide to become the lean solution 5. The lean solution 5 sucked from the suction port 61 is also heated to release carbon dioxide. The lean solution 5 passes through the opening 47 and flows into the downstream space 45.

  As described above, according to the present embodiment, the lean liquid 5 in the downstream space 45 can be sucked into the upstream space 44 by the suction port 61 provided in the dividing member 43. As a result, the lean solution 5 in the downstream space 45 can be heated again by the heater main body 49 of the heater 48, and carbon dioxide can be further released from the lean solution 5. Therefore, the carbon dioxide content of the lean liquid 5 discharged from the regenerating apparatus 30 can be further reduced.

  In the present embodiment described above, the inlet 41 may be configured to discharge the rich liquid 4 upward. In this case, the upward flow of the rich liquid 4 in the upstream side space 44 can be intensified, and the suction amount of the lean liquid 5 from the suction port 61 can be increased.

Fourth Embodiment
Next, a carbon dioxide recovery system and a method of operating the carbon dioxide recovery system according to a fourth embodiment of the present invention will be described with reference to FIG.

  The fourth embodiment shown in FIG. 6 is mainly different in that the upstream space is provided with a baffle for changing the flow direction of the absorbing liquid flowing toward the opening in the upstream space; The configuration is substantially the same as that of the first embodiment shown in FIG. 6, the same parts as those of the first embodiment shown in FIG. 1 are designated by the same reference numerals and their detailed description will be omitted.

  In the present embodiment, as shown in FIG. 6, the upstream space 44 is provided with a plate-shaped baffle 63 for changing the flow direction of the rich liquid 4 flowing toward the opening 47 in the upstream space 44. There is. FIG. 6 shows an example in which the upstream space 44 is provided with a plurality of baffles 63 extending in a direction (horizontal direction) orthogonal to the axial direction of the dividing member 43. The baffle 63 is supported at the proximal end by the partition member 43, and at the free end, defines a flow path through which the rich liquid 4 passes. The baffles 63 are arranged in a nested manner. That is, the base end of the baffle 63 supported by the part on one side of the dividing member 43 (left part in FIG. 6), and the base end is the part on the other side of the dividing member 43 (right The baffles 63 supported on the portions are alternately arranged in the axial direction of the dividing member 43.

  Each baffle 63 is preferably provided with a through hole 64 through which air bubbles of carbon dioxide released from the rich solution 4 can pass. The shape, size, and number of the through holes 64 are arbitrary as long as carbon dioxide bubbles can pass through, and it is optional if the purpose of the baffle 63 for changing the flow of the rich liquid 4 can be prevented from being lost is there. Although FIG. 6 shows an example in which the through holes 64 are provided in the uppermost baffle 63 in order to clarify the drawing, a plurality of through holes 64 are provided in the baffle 63 of each step. Is preferred.

  In FIG. 6, the projecting portion 46 as shown in FIG. 1 and the like is not formed, and the partitioning member 43 is disposed inside the regeneration tank 40. Then, in the downstream side space 45, a rich liquid pipe 62 connecting the rich liquid line L1 and the introduction port 41 is inserted.

  In the present embodiment, the flow of the rich solution 4 introduced from the inlet 41 is restricted by the baffle 63, and the flow direction of the rich solution 4 is changed. As described above, since the plurality of baffles 63 are nested, the rich liquid 4 in the upstream space 44 rises in the upstream space 44 while meandering in the horizontal direction. During this time, the rich solution 4 is heated by the heater main body 49 of the heater 48, carbon dioxide is released from the rich solution 4, and becomes the lean solution 5. The lean solution 5 rises while meandering in the upstream space 44, passes through the opening 47 and flows into the downstream space 45.

  As described above, according to the present embodiment, the flow direction of the rich liquid 4 in the upstream space 44 can be changed by the baffle 63 provided in the upstream space 44. Thus, the rich liquid 4 in the upstream space 44 can be uniformly heated, and the heating time of the rich liquid 4 and the heater main body 49 of the heater 48 can be lengthened. Therefore, carbon dioxide can be released from the rich solution 4 more efficiently. As a result, the carbon dioxide content of the lean liquid 5 discharged from the regeneration device 30 can be further reduced.

  Further, according to the present embodiment, by providing the through holes 64 in the baffle 63, the bubbles of carbon dioxide released from the rich liquid 4 can pass through the through holes 64 and rise. As a result, bubbles of carbon dioxide can be smoothly raised, and carbon dioxide can be smoothly separated from the absorbing liquids 4 and 5. Therefore, the carbon dioxide content of the lean liquid 5 discharged from the regenerating apparatus 30 can be further reduced.

  In the above-described embodiment, the example in which the baffles 63 extend in the direction (horizontal direction) orthogonal to the axial direction of the dividing member 43 has been described. However, this is not restrictive. For example, the baffles 63 may be formed to extend in a direction oblique to the horizontal direction (or the axial direction of the dividing member 43). In this case, it is preferable that the free end be located higher than the proximal end of the baffle 63. By this, even if the through holes 64 as shown in FIG. 6 are not provided, the bubbles of carbon dioxide released from the rich liquid 4 can be raised toward the liquid surfaces of the absorbing liquids 4 and 5 .

  According to the embodiment described above, the carbon dioxide content of the absorbent discharged from the regenerating apparatus can be reduced, and the carbon dioxide recovery performance can be improved.

  While certain embodiments of the present invention have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and the gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof. Of course, it is also possible to partially combine the embodiments appropriately within the scope of the present invention.

1: Carbon dioxide recovery system, 20: absorber, 30: regenerator, 40: regeneration tank, 41: inlet, 42: outlet, 43: partition member, 44: upstream space, 45: downstream space, 47 : Opening, 48: Heater, 60: Straightening plate, 61: Suction port, 63: Baffle, 64: Through hole

Claims (10)

An absorber for absorbing carbon dioxide contained in the exhaust gas to be treated into an absorbent;
The regeneration device for releasing the carbon dioxide from the absorption liquid supplied from the absorption device;
The regeneration device includes a regeneration storage unit for storing the absorption liquid, an inlet for introducing the absorption liquid into the regeneration storage unit, an outlet for drawing the absorption liquid from the regeneration storage unit, and a dividing member. Have
The dividing member divides the regeneration storage part into an upstream space formed on the side of the inlet and a downstream space formed on the side of the outlet;
The partition member includes an opening through which the absorbent passes from the upstream space to the downstream space.
The carbon dioxide recovery system, wherein a heating unit for heating the absorbing liquid is provided in the upstream space.   The carbon dioxide recovery system according to claim 1, wherein the partition member extends in the vertical direction.   The carbon dioxide recovery system according to claim 1, wherein the downstream space is formed around the dividing member. The regeneration reservoir and the partition member are formed in a cylindrical shape,
The carbon dioxide recovery system according to any one of claims 1 to 3, wherein the dividing member is formed concentrically in the regeneration reservoir.   The inlet is configured to introduce the absorbent into the upstream space so that the absorbent flows as a swirl flow in the upstream space. The carbon dioxide recovery system according to one item.   The flow control member which changes the flow direction of the absorption liquid so that the absorption liquid flows as a swirling flow in the upstream space is provided in the upstream space, any one of claims 1 to 4. The carbon dioxide recovery system according to Item. The partition member is provided with a suction port for sucking the absorbent in the downstream space into the upstream space,
The carbon dioxide recovery system according to any one of claims 1 to 6, wherein the suction port is disposed on the opposite side to the side of the opening with respect to the inlet.   The carbon dioxide recovery according to any one of claims 1 to 7, wherein the upstream space is provided with a baffle for changing the flow direction of the absorbing liquid flowing toward the opening in the upstream space. system.   The carbon dioxide recovery system according to claim 8, wherein the baffle is provided with a through hole through which the carbon dioxide released from the absorbing liquid passes. Method of operating a carbon dioxide recovery system comprising: an absorption device for absorbing carbon dioxide contained in the exhaust gas to be treated into an absorption liquid; and a regeneration device for releasing the carbon dioxide from the absorption liquid supplied from the absorption device And
Introducing the absorption liquid supplied from the absorption device into the upstream space partitioned by the partitioning member in the regeneration storage portion of the regeneration device from the inlet of the regeneration device;
Heating the absorbing solution introduced into the upstream space;
Allowing the heated absorbing liquid to pass through the opening of the dividing member to flow into the downstream space of the regeneration reservoir divided by the dividing member;
And D. a step of leading out the absorbent, which has flowed into the downstream space, from an outlet port.

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