Absorber

Abstract

Prevents deposition from adhering to tubes in absorbers. [Solution] The absorption device has a storage section 20 that stores a solution that reacts with a predetermined component contained in a predetermined gas to produce a precipitate, a supply pipe 10 having a supply port 12 that supplies the predetermined gas into the solution in the storage section 20, an opening / closing member 30 that is movable between a closed position and an open position of the supply port 12 depending on the pressure of the gas inside the supply pipe 10, and a sliding section 40 that is provided inside the supply pipe 10 and moves in conjunction with the opening / closing member 30. The sliding section 40 slides against an inner wall surface 14 on the supply port 12 side of the supply pipe 10.

Description

[Technical field]

[0001] The present invention relates to an absorption device for absorbing a predetermined component from a gas. [Background technology]

[0002] Patent Document 1 discloses a recovery device that recovers carbon dioxide (a predetermined component) from gas. This recovery device has an absorption section that brings a liquid absorbent, which is a solution, into contact with the gas to absorb the carbon dioxide contained in the gas. The gas flows through a pipe and is supplied from a supply port to the absorption section that contains the liquid absorbent. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-24374 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, when the gas reacts with the solution, a precipitate is generated. The generated precipitate may adhere to the supply port of the tube and cause the supply port to become clogged. If the supply port becomes clogged, the gas cannot be properly supplied to the absorption section, and the desired components cannot be recovered.

[0005] The present invention has been made in consideration of these points, and has an object to suppress adhesion of deposits to tubes in an absorption device. [Means for solving the problem]

[0006] In one aspect of the present invention, there is provided an absorption device comprising: a storage section for storing a solution that reacts with a predetermined component contained in a predetermined gas to produce a precipitate; a tube having a supply port for supplying the predetermined gas into the solution in the storage section; an opening / closing member that is movable between a closing position for closing the supply port and an opening position for opening the supply port depending on the pressure of the predetermined gas inside the tube; and a sliding member that is provided inside the tube and moves in conjunction with the opening / closing member, wherein the sliding member slides against an inner wall surface on the supply port side of the tube.

[0007] The sliding portion may have a groove formed on an outer circumferential surface of the shaft portion, and the outer circumferential surface may slide against the inner wall surface.

[0008] The supply port may be an opening at a tip end of the tube that is perpendicular to a longitudinal direction of the tube, and the opening / closing member may be a circular plate member that is capable of closing the opening.

[0009] The tube may further include a connecting member having one axial end connected to the opening / closing member and movable in the longitudinal direction of the tube together with the opening / closing member, and a spring member that pulls the other axial end of the connecting member to move the opening / closing member to the blocking position.

[0010] In addition, the connecting member may move in conjunction with the opening / closing member which moves back and forth between the closed position and the open position due to the pressure of the gas and the tensile force of the spring member when the gas flows through the tube.

[0011] The pipe may also include a first pipeline through which the gas flows and a second pipeline perpendicular to the first pipeline and through which the connecting member is provided, and the spring member may be located at a connection between the first pipeline and the second pipeline.

[0012] The device may further include a heating member that heats the sliding portion when the gas is not flowing through the tube.

[0013] In addition, the tube may further include a connecting member whose one axial end is connected to the opening / closing member and which is movable together with the opening / closing member in the longitudinal direction of the tube, the connecting member being a hollow shaft member, and the heating member being provided within the connecting member.

[0014] The gas may be exhaust gas discharged from an internal combustion engine, and the predetermined component may be carbon dioxide. Furthermore, when the sliding portion moves in conjunction with the opening and closing member, the sliding portion may move across at least the supply port of the tube in the axial direction. Effect of the Invention

[0015] According to the present invention, it is possible to suppress adhesion of deposits to tubes in an absorption device. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a schematic diagram showing a configuration of a recovery device 1 according to one embodiment. [Diagram 2] 1 is a schematic diagram for explaining adhesion of a deposit 90 to a supply pipe 10. FIG. [Diagram 3] 2 is a schematic diagram showing the internal configuration of a supply pipe 10. FIG. [Figure 4] 2 is a schematic diagram for explaining an example of the configuration of a sliding portion 40. FIG. [Diagram 5] FIG. 13 is a schematic diagram showing a configuration according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] <Configuration of the recovery device> FIG. 1 is a schematic diagram showing the configuration of a capture device 1 according to one embodiment. The capture device 1 is a device for capturing a predetermined component from a gas. For example, the capture device 1 captures carbon dioxide as the predetermined component from exhaust gas discharged from an internal combustion engine. The internal combustion engine is assumed to be a diesel engine mounted on a vehicle such as a truck. Note that the capture device 1 is not limited to the above, and may capture carbon dioxide from the atmosphere (air) instead of exhaust gas from the internal combustion engine. Furthermore, the capture device 1 may capture components other than carbon dioxide.

[0018] The recovery device 1 has a function as an absorber that absorbs a specific component from a gas using a so-called chemical absorption method. In the chemical absorption method, a specific component is absorbed from a gas using an absorbing liquid. The recovery device 1 also has a function of recovering the absorbed specific component. For example, the recovery device 1 heats and regenerates the absorbing liquid that has absorbed the specific component, thereby separating the specific component from the absorbing liquid, and recovering the separated specific component.

[0019] As shown in FIG. 1, the recovery device 1 has a housing 5, a supply pipe 10, and a storage section 20. The housing 5 is configured in a box shape. A space for accommodating a solution is formed inside the housing 5, and a gas is supplied to the space from the outside. A hole through which the supply pipe 10 is inserted is formed in the upper portion 5a of the housing 5.

[0020] The supply pipe 10 is a pipe through which gas containing a predetermined component flows. In this example, exhaust gas containing carbon dioxide flows through the supply pipe 10. The supply pipe 10 forms a supply path that supplies gas from the outside to the storage section 20 in the housing 5. A supply port 12 is provided at the tip of the supply pipe 10. The supply port 12 is an opening perpendicular to the longitudinal direction of the supply pipe 10. The supply pipe 10 is disposed vertically within the housing 5 such that the supply port 12 is located a predetermined distance away from the bottom 5b of the housing 5. The predetermined distance is, for example, a distance smaller than half the height of the housing 5.

[0021] The gas flowing through the supply pipe 10 is supplied to the accommodation portion 20 in the housing 5 from the supply port 12. The gas may be pumped into the supply pipe 10 by, for example, a pump so that the pressure of the gas flowing through the supply pipe 10 becomes large.

[0022] The storage section 20 stores a solution. The storage section 20 surrounds the supply port 12 within the housing 5. The solution stored in the storage section 20 is an absorbing liquid that absorbs carbon dioxide, which is a predetermined component, from the gas supplied from the supply port 12. The absorbing liquid is a solution containing a chemical that is highly reactive with the predetermined component, and an example of the absorbing liquid is a solution containing calcium hydroxide. The water level of the solution in the housing 5 is higher than the supply port 12. Therefore, the gas flowing out from the supply port 12 immediately comes into contact with the solution.

[0023] In order to increase the efficiency of absorption of the predetermined component, a solution containing a substance that undergoes a fast chemical reaction with the predetermined component is used. In this case, the chemical reaction starts when the gas flowing out from the supply port 12 comes into contact with the solution. The substance produced by the chemical reaction becomes a highly viscous substance or a solid precipitate, and there is a risk that the precipitate will clog the supply port 12. If the supply port 12 is clogged with the precipitate, the gas cannot be supplied to the storage section 20, and the predetermined component cannot be recovered from the gas.

[0024] FIG. 2 is a schematic diagram for explaining the adhesion of the deposit 90 to the supply pipe 10. State B1 shown in FIG. 2 shows the state before the gas is supplied, and no deposit is attached to the supply port 12. State B2 shows the state after a predetermined time has elapsed since the start of the gas supply, and the deposit 90 is attached to the inner wall surface 14 around the supply port 12. State B3 shows the state after the gas supply has continued from state B2. As time passes from state B2, the generated deposit sticks to the deposit 90 attached to the inner wall surface 14. As a result, the deposit 90 blocks the supply port 12, and gas cannot be supplied to the storage section 20 thereafter. As a result, the solution cannot continue absorbing the predetermined components.

[0025] In contrast, the recovery device 1 of this embodiment, which will be described in detail later, has a sliding portion for removing deposits attached to the inner wall surface 14 when gas is supplied to the storage unit 20. This makes it possible to suppress the deposition of deposits on the inner wall surface 14 while continuing to supply gas to the storage unit 20.

[0026] <Configuration to suppress adhesion of deposits> Fig. 3 is a schematic diagram showing the internal configuration of the supply pipe 10. Note that Fig. 3 shows the supply pipe 10 as viewed from the direction of arrow A in Fig. 1. Also, Fig. 3 shows the sliding portion 40 in a simplified manner, unlike Fig. 4.

[0027] The supply pipe 10 has a first pipe line 11a, a second pipe line 11b, and a connection portion 11c. The first pipe line 11a and the second pipe line 11b are perpendicular to each other here, forming an L-shaped supply pipe 10.

[0028] The first pipeline 11a is a flow path through which gas flows in from the outside. The second pipeline 11b is a flow path through which the gas that flows in from the first pipeline 11a flows to the storage section 20. A supply port 12 is formed at the tip of the second pipeline 11b. The connection section 11c is a section that connects the first pipeline 11a and the second pipeline 11b, and is a corner section of the supply pipe 10.

[0029] The recovery device 1 has an opening / closing member 30, a connecting member 33, a spring member 36, and a sliding portion 40 in order to suppress adhesion of the deposit to the inner wall surface 14.

[0030] The opening / closing member 30 is a member that closes or opens the supply port 12. The opening / closing member 30 is movable between a closing position where the supply port 12 is closed and an opening position where the supply port 12 is opened. The opening / closing member 30 is a circular flat plate member that can close the supply port 12. The size of the flat plate surface of the opening / closing member 30 may be the same as that of the supply port 12, or may be larger than that of the supply port 12. Thereby, when the opening / closing member 30 is located at the closing position, the opening / closing member 30 can seal the supply port 12.

[0031] When the opening / closing member 30 is located in the closed position, gas does not flow from the supply port 12 to the storage section 20, and when the opening / closing member 30 is located in the open position, gas flows from the supply port 12 to the storage section 20. When gas is supplied into the supply pipe 10 with the opening / closing member 30 located in the closed position, the pressure of the gas in the supply pipe 10 increases.

[0032] When the pressure of the gas in the second pipe 11b of the supply pipe 10 becomes large, the opening / closing member 30 moves from the closed position to the open position. Specifically, when the difference between the pressure of the gas inside the second pipe 11b of the supply pipe 10 and the pressure outside the supply pipe 10 becomes larger than the elastic force of a spring member 36 described later, the opening / closing member 30 moves from the closed position to the open position. That is, the flat surface of the opening / closing member 30 is pushed by the gas, and the opening / closing member 30 moves from the closed position to the open position. This makes it possible to move the opening / closing member 30 to the open position when supplying gas to the storage section 20, even without providing a drive mechanism for moving the opening / closing member 30 to the open position.

[0033] The connecting member 33 is connected to the opening / closing member 30 and the spring member 36 inside the supply pipe 10. The connecting member 33 is provided in the second pipeline 11b of the supply pipe 10. The connecting member 33 is an axial member located inside the supply pipe 10 parallel to the longitudinal direction of the supply pipe 10. One axial end of the connecting member 33 is connected to the center of the opening / closing member 30, and the other axial end of the connecting member 33 is connected to the spring member 36.

[0034] The connecting member 33 is configured to be movable together with the opening / closing member 30. That is, when the opening / closing member 30 moves between the closed position and the open position, the connecting member 33 also moves in conjunction with the opening / closing member 30. Specifically, the air flowing through the second pipe 11b presses the flat surface of the opening / closing member 30, causing the opening / closing member 30 and the connecting member 33 to move.

[0035] The spring member 36 is provided inside the supply pipe 10 and has a function of pulling the connecting member 33. The spring member 36 is located at the connection portion 11c of the supply pipe 10. Here, the spring member 36 is a tension spring that pulls the other end of the connecting member 33 in the axial direction. One end of the spring member 36 is connected to the connection portion 11c, and the other end of the spring member 36 is connected to the connecting member 33.

[0036] The spring member 36 pulls the connecting member 33, so that the opening / closing member 30 connected to the connecting member 33 is located at the closed position. For example, when the pressure of the gas in the second pipe 11b is smaller than the pressure outside the supply pipe 10, the pulling force of the spring member 36 acts on the connecting member 33 to move the opening / closing member 30 connected to the connecting member 33 from the open position to the closed position. More specifically, when the pressure difference between the front and rear of the opening / closing member 30 is smaller than the pulling force generated by the spring member 36, the connecting member 33 moves to move the opening / closing member 30 from the open position to the closed position. Also, when the supply pressure of the gas on the supply pipe 10 side is high and the pressure difference between the front and rear of the opening / closing member 30 is larger than the pulling force generated by the spring member 36, a force acts on the connecting member 33 in the direction of moving the opening / closing member 30 from the closed position to the open position.

[0037] In the case where the above-described opening / closing member 30, connecting member 33, and spring member 36 are provided, when gas flows through the supply pipe 10, the following operation takes place. Here, gas is supplied to the supply pipe 10 in a state where the opening / closing member 30 is pulled by the spring member 36 and positioned at the closed position. In this case, since the opening / closing member 30 is positioned at the closed position, the pressure of the gas in the second pipe 11b of the supply pipe 10 increases. When the pressure of the gas in the second pipe 11b increases and the pressure difference between the inside and outside of the supply pipe 10 increases, the opening / closing member 30 moves from the closed position to the open position against the pulling force of the spring member 36, and the connecting member 33 also moves. When the opening / closing member 30 moves to the open position, the gas in the second pipe 11b flows from the supply port 12 to the storage section 20. Then, when the gas flows into the storage section 20, the pressure of the gas in the second pipe 11b decreases and the pressure difference across the opening / closing member 30 decreases. When the pressure difference becomes smaller than the pulling force of the spring member 36, the spring member 36 moves the opening / closing member 30 from the open position to the closed position. At this time, the connecting member 33 also moves together with the opening / closing member 30. Even if the opening / closing member 30 is in the closed position, if the supply of gas to the supply pipe 10 continues, the gas pressure in the supply pipe 10 increases again, and when the pressure difference becomes greater than the pulling force, the opening / closing member 30 moves to the open position due to the gas pressure. As the opening / closing member 30 moves back and forth between the closed position and the open position in this manner, the connecting member 33 also moves back and forth within the second pipe line 11b.

[0038] The sliding portion 40 slides against the inner wall surface 14 on the supply port 12 side of the supply pipe 10. The sliding portion 40 is provided at the end portion of the connecting member 33 on the opening / closing member 30 side in the axial direction. The sliding portion 40 slides against the inner wall surface 14 when the connecting member 33 moves. Specifically, when the connecting member 33 moves, the sliding portion 40 slides against the inner wall surface 14 in conjunction with the movement of the opening / closing member 30.

[0039] When the sliding part 40 slides against the inner wall surface 14, the sliding part 40 scrapes off the deposits adhering to the inner wall surface 14, thereby removing the deposits. In particular, the sliding part 40 moves back and forth together with the connecting member 33 inside the supply pipe 10, thereby effectively removing the deposits adhering to the inner wall surface 14. It is desirable that the sliding part 40 moves so as to straddle at least the supply port 12, which is the outlet of the supply pipe 10. By moving the sliding part 40 across the supply port 12 of the supply pipe 10, the deposits adhering near the supply port 12 can be removed, and the supply port 12 of the supply pipe 10 can be prevented from being blocked by the deposits.

[0040] 4 is a schematic diagram for explaining an example of the configuration of the sliding portion 40. The sliding portion 40 has a large diameter portion 42 and a groove 44. The large diameter portion 42 is a shaft portion having a larger diameter than the connecting member 33. The large diameter portion 42 is provided at an end portion of the connecting member 33 on the opening / closing member 30 side in the axial direction. An outer peripheral surface 43 of the large diameter portion 42 slides against the inner wall surface 14 of the supply pipe 10. When the outer peripheral surface 43 slides against the inner wall surface 14, precipitates attached to the inner wall surface 14 of the second pipe 11b can be removed.

[0041] The groove 44 is formed to a predetermined depth on the outer peripheral surface 43 of the large diameter portion 42. The groove 44 is formed, for example, so that the sliding portion 40 has a shape of a drill bit. As an example, the groove 44 is formed in a spiral shape. By forming the groove 44 on the outer peripheral surface 43, even when the sliding portion 40 slides against the inner wall surface 14, gas can pass through the groove 44 and flow into the storage portion 20.

[0042] The sliding portion 40 may be a brush provided on the outer circumferential surface of the connecting member 33. In this case, when the connecting member 33 moves, the brush slides against the inner wall surface 14 of the second pipeline 11b, and can remove deposits attached to the inner wall surface 14.

[0043] Moreover, the sliding portion 40 may be a protrusion provided in a spiral shape on the outer circumferential surface of the connecting member 33. In this case as well, when the connecting member 33 moves, the protrusion slides against the inner wall surface 14 of the second pipeline 11b, and the deposits attached to the inner wall surface 14 can be removed.

[0044] (Modification) In the above, the precipitate adheres to the inner wall surface 14 of the supply pipe 10, but it may also adhere to the sliding part 40. For example, when the opening / closing member 30 is positioned at the open position, the sliding part 40 comes into contact with the solution, and there is a risk of the precipitate adhering to the sliding part 40 (specifically, the groove 44). Therefore, in the modified example, a heating member for heating the sliding part 40 is provided in the connecting member 33 in order to remove the precipitate adhering to the sliding part 40.

[0045] 5 is a schematic diagram showing a configuration according to a modified example. The connecting member 33 is a hollow shaft member, specifically a double tube having an inner tube 35a and an outer tube 35b. The heating member 50 is provided between the inner tube 35a and the outer tube 35b. The heating member 50 is, for example, a heater. The heating member 50 is provided at a position adjacent to the sliding portion 40 in the inner tube 35a. As a result, when the heating member 50 generates heat, the heat is transferred to the sliding portion 40 via the connecting member 33, so that the sliding portion 40 can be efficiently heated.

[0046] The recovery device 1 has a control unit that controls the heat generation of the heating member 50, and when no gas is flowing through the supply pipe 10, the heating member 50 generates heat to heat the sliding part 40. For example, the control unit may cause the heating member 50 to generate heat for a predetermined period of time every time the supply of gas to the storage part 20 is stopped.

[0047] When the above-mentioned heating member 50 is provided, the sliding portion 40 is heated, and the precipitate adhering to the sliding portion 40 (specifically, the groove 44) is thermally decomposed. The precipitate becomes liquid by thermal decomposition, and is taken into the solution in the storage portion 20 when the opening / closing member 30 moves to the open position. As a result, the precipitate adhering to the sliding portion 40 can be removed.

[0048] <Effects of this embodiment> The recovery device 1 of the above-described embodiment has an opening / closing member 30 that is movable between a closed position and an open position depending on the pressure of the gas flowing through the supply pipe 10, and a sliding part 40 that is provided inside the supply pipe 10 and moves in conjunction with the opening / closing member 30. The sliding part 40 slides against the inner wall surface 14 on the supply port 12 side of the supply pipe 10. As a result, when gas flows through supply pipe 10 and is supplied to storage section 20, the sliding portion 40 slides against inner wall surface 14 in accordance with the movement of opening / closing member 30 due to the pressure of the gas, thereby making it possible to remove deposits adhering to inner wall surface 14. As a result, it is possible to suppress the adhesion of deposits to supply pipe 10 while continuing the supply of gas to storage section 20. In particular, in this embodiment, as coupling member 33 reciprocates within supply pipe 10, sliding portion 40 also reciprocates, making it easier to remove deposits adhering to inner wall surface 14.

[0049] Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments, and various modifications and changes are possible within the scope of the gist of the present invention. For example, all or part of the device can be configured by distributing or integrating functionally or physically in any unit. In addition, new embodiments resulting from any combination of multiple embodiments are also included in the embodiments of the present invention. The effect of the new embodiment resulting from the combination combines the effect of the original embodiment. [Explanation of symbols]

[0050] 1 Recovery device 10 Supply pipe 12 Supply inlet 14 Inner wall surface 20 Storage unit 30 Opening and closing members 33 Connecting members 36 Spring member 40 Sliding part 50 Heating member

Claims

1. a container for containing a solution that reacts with a predetermined component contained in a predetermined gas to produce a precipitate; a tube having a supply port for supplying the predetermined gas into the solution in the container; A connecting member provided inside the pipe so as to be movable along a longitudinal direction; an opening / closing member which is a circular plate member connected to one end of the connecting member in the axial direction and movable between a closing position for closing the supply port and an opening position for opening the supply port; a spring member connected to the other end of the connecting member in the axial direction; a sliding portion provided on the one end side of the connecting member in the axial direction; having the opening / closing member reciprocates between the closed position and the open position together with the connecting member due to a difference between the gas pressure inside the tube and the pressure outside the tube and a pulling force of the spring member, The sliding portion slides against an inner wall surface on a supply port side of the pipe when the connecting member moves back and forth.

2. The sliding portion has a large diameter portion having a diameter larger than that of the connecting member, and a groove is formed on an outer circumferential surface of the large diameter portion. The outer circumferential surface slides against the inner wall surface.

2. The absorber of claim 1.

3. The supply port is an opening at the tip of the tube perpendicular to the longitudinal direction of the tube.

2. The absorber of claim 1.

4. The pipe includes a first pipe line into which the gas flows, and a second pipe line perpendicular to the first pipe line and provided with the connecting member, The spring member is located at a connection portion between the first pipeline and the second pipeline.

2. The absorber of claim 1.

5. The pump further includes a heating member that heats the sliding portion when the gas is not flowing through the pipe.

2. The absorber of claim 1.

6. The connecting member is a hollow shaft member, The heating member is provided within the connecting member.

6. The absorber of claim 5.

7. The gas is exhaust gas discharged from an internal combustion engine, The predetermined component is carbon dioxide.

2. The absorber of claim 1.

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