Absorption apparatus

Abstract

To suppress adhesion of precipitates to a pipe in an absorption apparatus.SOLUTION: An absorption apparatus comprises: a storage unit 20 that stores a solution which reacts with a predetermined component contained in a predetermined gas to generate a precipitate; a supply pipe 10 having a supply port 12 for supplying the predetermined gas into the solution in the storage unit 20; an opening and closing member 30 that is movable between the closed position and the open position of the supply port 12 in accordance with the pressure of the gas inside the supply pipe 10; and a sliding unit 40 provided inside the supply pipe 10 and configured to move in conjunction with the opening and closing member 30. The sliding unit 40 slides relative to the inner wall surface 14 of the supply pipe 10 on the supply port side 12.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to an absorption device that absorbs a predetermined component from a gas.

Background Art

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

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, when a gas reacts with a solution, precipitates are generated. The generated precipitates may adhere to the supply port of the pipe and block the supply port. If the supply port is blocked, the gas cannot be properly supplied to the absorption section, so that the predetermined component cannot be recovered.

[0005] Therefore, the present invention has been made in view of these points, and an object thereof is to suppress the adhesion of precipitates to the pipe in the absorption device.

Means for Solving the Problems

[0006] In one aspect of the present invention, there is provided an absorption device including: a housing portion that houses a solution that reacts with a predetermined component contained in a predetermined gas to generate a precipitate; a tube having a supply port that supplies the predetermined gas into the solution in the housing portion; an opening / closing member that is movable between a closed position where the supply port is closed and an open position where the supply port is opened according to the pressure of the predetermined gas inside the tube; and a sliding portion provided inside the tube and moving in conjunction with the opening / closing member, wherein the sliding portion slides with respect to the inner wall surface on the supply port side of the tube.

[0007] Further, the sliding portion may have a shape in which a groove is formed on the outer peripheral surface of a shaft portion, and the outer peripheral surface may slide with respect to the inner wall surface.

[0008] Further, the supply port may be an opening orthogonal to the longitudinal direction of the tube at the tip of the tube, and the opening / closing member may be a circular plate member capable of closing the opening.

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

[0010] Further, when the gas flows in the tube, the connecting member may move in conjunction with the opening / closing member that reciprocates between the closed position and the open position by the pressure of the gas and the pulling force of the spring member.

[0011] Further, the tube may include a first pipe through which the gas flows in and a second pipe orthogonal to the first pipe and provided with the connecting member, and the spring member may be located at the connection portion between the first pipe and the second pipe.

[0012] Furthermore, when the gas is not flowing in the tube, it may further include a heating member that heats the sliding portion.

[0013] Further, one end in the axial direction is connected to the opening and closing member, and a connecting member that is movable in the longitudinal direction of the pipe together with the opening and closing member is further provided. The connecting member is a hollow shaft member, and the heating member may be provided inside the connecting member.

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

Advantages of the Invention

[0015] According to the present invention, there is an effect that adhesion of deposits to the pipe in the absorption device can be suppressed.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

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

[0018] The recovery device 1 has the function of an absorption device that absorbs a predetermined component from a gas using a so-called chemical absorption method. In the chemical absorption method, a predetermined component is absorbed from the gas by an absorption liquid. The recovery device 1 also has the function of recovering the absorbed predetermined component. For example, the recovery device 1 separates the predetermined component and the absorption liquid by heating and regenerating the absorption liquid that has absorbed the predetermined component, and recovers the separated predetermined component.

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

[0020] The supply pipe 10 is a pipe through which a gas containing a predetermined component flows. Here, the exhaust gas containing carbon dioxide flows through the supply pipe 10. The supply pipe 10 forms a supply path for supplying gas from the outside to the storage unit 20 inside the housing 5. A supply port 12 is provided at the tip of the supply pipe 10. The supply port 12 is an opening orthogonal to the longitudinal direction of the supply pipe 10. The supply pipe 10 is vertically arranged inside the housing 5 such that the supply port 12 is located at a predetermined distance from the bottom 5b of the housing 5. The predetermined distance is, for example, a distance smaller than half of the height of the housing 5.

[0021] The gas flowing through the supply pipe 10 is supplied from the supply port 12 to the accommodation part 20 in the housing 5. 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 increases.

[0022] The accommodation part 20 accommodates a solution. The accommodation part 20 surrounds the supply port 12 within the housing 5. The solution accommodated in the accommodation part 20 is an absorption liquid that absorbs carbon dioxide, which is a predetermined component, from the gas supplied from the supply port 12. The absorption liquid is a solution containing a chemical with high reactivity with a predetermined component, and is, for example, a solution containing calcium hydroxide. The liquid 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 contacts the solution.

[0023] By the way, in order to enhance the absorption efficiency of a predetermined component, a solution containing a substance with a high chemical reaction rate with the predetermined component is used. In this case, when the gas flowing out from the supply port 12 comes into contact with the solution, a chemical reaction is initiated. The substance generated by the chemical reaction becomes a precipitate that is a substance with high viscosity or a solid, but there is a risk that the precipitate may block the supply port 12. If the supply port 12 is blocked by the precipitate, gas cannot be supplied to the accommodation part 20, and thus the predetermined component cannot be recovered from the gas.

[0024] FIG. 2 is also a schematic diagram for explaining the adhesion of the precipitate 90 to the supply pipe 10. The state B1 shown in FIG. 2 indicates the state before the gas is supplied, and no precipitate adheres to the supply port 12. The state B2 indicates the state after a predetermined time has elapsed since the start of the gas supply, and the precipitate 90 adheres to the surrounding inner wall surface 14 of the supply port 12. The state B3 indicates the state after the gas supply continues from the state B2. As time passes from the state B2, the generated precipitate adheres to the precipitate 90 adhering to the inner wall surface 14. As a result, the precipitate 90 blocks the supply port 12, and thereafter, gas cannot be supplied to the accommodation part 20. As a result, the absorption of the predetermined component by the solution cannot be continued.

[0025] On the other hand, although details will be described later, the recovery device 1 of the present embodiment has a sliding portion for removing deposits adhering to the inner wall surface 14 when gas is supplied to the accommodating portion 20. Thereby, while continuously supplying gas to the accommodating portion 20, it is possible to suppress the adhesion of deposits to the inner wall surface 14.

[0026] <Configuration for suppressing adhesion of deposits> FIG. 3 is a schematic diagram showing the internal configuration of the supply pipe 10. In FIG. 3, the supply pipe 10 is shown as viewed from the direction of arrow A in FIG. 1. Also, in FIG. 3, unlike FIG. 4, the sliding portion 40 is shown in a simplified manner.

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

[0028] The first pipe portion 11a is a flow path through which gas flows in from the outside. The second pipe portion 11b is a flow path for flowing the gas that has flowed in from the first pipe portion 11a to the accommodating portion 20. A supply port 12 is formed at the tip of the second pipe portion 11b. The connecting portion 11c is a portion that connects the first pipe portion 11a and the second pipe portion 11b, and is the corner portion in 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 the adhesion of deposits 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 closed position where the supply port 12 is closed and an open position where the supply port 12 is open. The opening / closing member 30 is a circular flat plate member capable of closing 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 the supply port 12. Thereby, when the opening / closing member 30 is in the closed position, the opening / closing member 30 can seal the supply port 12.

[0031] When the opening / closing member 30 is in the closed position, no gas flows from the supply port 12 to the storage part 20. When the opening / closing member 30 is in the open position, gas flows from the supply port 12 to the storage part 20. When gas is supplied into the supply pipe 10 with the opening / closing member 30 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 increases, 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 is greater than the elastic force of the 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. Thereby, even without providing a drive mechanism for moving the opening / closing member 30 to the open position, when supplying gas to the storage part 20, the opening / closing member 30 can be moved 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 pipe 11b of the supply pipe 10. The connecting member 33 is a shaft member positioned parallel to the longitudinal direction of the supply pipe 10 inside 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. Specifically, the air flowing through the second pipe 11b pushes 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 in the supply pipe 10 and has a function of pulling the connecting member 33. The spring member 36 is located at the connecting portion 11c of the supply pipe 10. Here, the spring member 36 is a tension spring that pulls the other axial end of the connecting member 33. One end of the spring member 36 is connected to the connecting portion 11c, and the other end of the spring member 36 is connected to the connecting member 33.

[0036] When the spring member 36 pulls the connecting member 33, the opening / closing member 30 connected by the connecting member 33 is located at the closed position. For example, when the pressure of the gas in the second pipeline 11b is smaller than the pressure outside the supply pipe 10, a force is applied to the connecting member 33 by the pulling force of the spring member 36 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 before and after the opening / closing member 30 is smaller than the pulling force generated by the spring member 36, the connecting member 33 moves so as to move the opening / closing member 30 from the open position to the closed position. Also, if the supply pressure of the gas on the supply pipe 10 side is high and the pressure difference before and after 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] When the above-described opening / closing member 30, connecting member 33, and spring member 36 are provided, when gas flows in the supply pipe 10, the following operations are performed. Here, it is assumed that the opening / closing member 30 is pulled by the spring member 36 and is in the closed position, and gas is supplied to the supply pipe 10. In this case, since the opening / closing member 30 is in 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 becomes large, 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 accommodating portion 20. Then, when the gas starts to flow into the accommodating portion 20, the pressure of the gas in the second pipe 11b decreases, and the pressure difference across the opening / closing member 30 becomes small. 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. If the supply of gas to the supply pipe 10 continues even when the opening / closing member 30 is in the closed position, the pressure of the gas in the supply pipe 10 increases again. When the pressure difference becomes larger than the pulling force, the opening / closing member 30 moves to the open position due to the gas pressure. In this way, by reciprocating the movement of the opening / closing member 30 between the closed position and the open position, the connecting member 33 also reciprocates within the second pipe 11b.

[0038] The sliding portion 40 slides on 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 on the inner wall surface 14 when the connecting member 33 moves. Specifically, when the connecting member 33 moves, the sliding portion 40 slides on the inner wall surface 14 in conjunction with the movement of the opening / closing member 30.

[0039] When the sliding part 40 slides with respect to the inner wall surface 14, the sliding part 40 can scrape off the deposits adhering to the inner wall surface 14, thereby removing the deposits. In particular, when the sliding part 40 reciprocates in the supply pipe 10 together with the connecting member 33, the deposits adhering to the inner wall surface 14 can be effectively removed. 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 over the supply port 12 of the supply pipe 10, the deposits adhering near the supply port 12 can be removed, and it is possible to prevent the supply port 12 of the supply pipe 10 from being blocked by the deposits.

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

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

[0042] Note that the sliding part 40 may be a brush provided on the outer peripheral surface of the connecting member 33. In this case, when the connecting member 33 moves, the brush slides with respect to the inner wall surface 14 of the second pipe 11b, and the deposits adhering to the inner wall surface 14 can be removed.

[0043] Also, the sliding part 40 may be a protrusion provided spirally on the outer peripheral surface of the connecting member 33. Even in such a case, when the connecting member 33 moves, the protrusion slides with respect to the inner wall surface 14 of the second pipe 11b, and the deposits adhering to the inner wall surface 14 can be removed.

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

[0045] FIG. 5 is a schematic diagram showing the configuration according to the modification 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. Thereby, when the heating member 50 generates heat, the heat is transmitted to the sliding portion 40 through the connecting member 33, so that the sliding portion 40 can be efficiently heated.

[0046] The recovery device 1 has a control unit for controlling the heat generation of the heating member 50, and heats the sliding portion 40 by causing the heating member 50 to generate heat when no gas is flowing in the supply pipe 10. For example, the control unit may cause the heating member 50 to generate heat for a predetermined time each time the supply of gas to the housing portion 20 stops.

[0047] When the heating member 50 described above is provided, the sliding portion 40 is heated, so that the precipitate adhering to the sliding portion 40 (specifically, the groove 44) is thermally decomposed. The precipitate becomes a liquid by thermal decomposition and is taken into the solution in the housing 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 in 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 in accordance with the pressure of the gas flowing through the supply pipe 10, and a sliding portion 40 that is provided inside the supply pipe 10 and moves in conjunction with the opening / closing member 30. The sliding portion 40 slides with respect to the inner wall surface 14 on the supply port 12 side of the supply pipe 10. Thus, when the gas flows through the supply pipe 10 and is supplied to the storage portion 20, as the sliding portion 40 slides with respect to the inner wall surface 14 as the opening / closing member 30 moves due to the pressure of the gas, the deposits adhering to the inner wall surface 14 can be removed. As a result, while continuously supplying the gas to the storage portion 20, it is possible to suppress the adhesion of deposits to the supply pipe 10. In particular, in the present embodiment, since the connecting member 33 reciprocates within the supply pipe 10, the sliding portion 40 also reciprocates, making it easier to remove the deposits adhering to the inner wall surface 14.

[0049] As described above, the present invention has been described using embodiments. However, 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. For example, all or part of the device can be configured by functionally or physically dispersing and integrating it in arbitrary units. Also, new embodiments resulting from an arbitrary combination of a plurality of embodiments are included in the embodiments of the present invention. The effects of the new embodiments resulting from the combination have the effects of the original embodiments combined.

Description of Reference Numerals

[0050] 1 Recovery device 10 Supply pipe 12 Supply port 14 Inner wall surface 20 Storage portion 30 Opening / closing member 33 Connecting member 36 Spring member 40 Sliding portion 50 Heating member

Claims

1. A housing portion that houses a solution that reacts with a predetermined component contained in a predetermined gas to generate a precipitate; A tube having a supply port for supplying the predetermined gas into the solution in the housing portion; An opening / closing member that is movable between a closed position for closing the supply port and an open position for opening the supply port according to the pressure of the predetermined gas inside the tube; A sliding portion provided inside the tube and moving in conjunction with the opening / closing member; and having The sliding portion slides with respect to the inner wall surface on the supply port side of the tube, an absorption device.

2. The sliding portion has a shape in which a groove is formed on the outer peripheral surface of the shaft portion, The outer peripheral surface slides with respect to the inner wall surface, The absorption device according to claim 1.

3. The supply port is an opening orthogonal to the longitudinal direction of the tube at the tip of the tube, The opening / closing member is a circular plate member capable of closing the opening, The absorption device according to claim 1.

4. A connecting member having one end in the axial direction connected to the opening / closing member and being movable in the longitudinal direction of the tube together with the opening / closing member; Further comprising a spring member that pulls the other end of the connecting member in the axial direction and moves the opening / closing member to the closed position. The absorption device according to claim 1.

5. When the gas flows through the tube, the connecting member moves in conjunction with the opening / closing member that reciprocates between the closed position and the open position by the pressure of the gas and the pulling force of the spring member. The absorption device according to claim 4.

6. The tube includes a first pipeline into which the gas flows and a second pipeline that is orthogonal to the first pipeline and in which the connecting member is provided. The spring member is located at the connection portion between the first pipeline and the second pipeline. The absorption device according to claim 4.

7. When the gas does not flow in the pipe, the absorption device further includes a heating member for heating the sliding portion. The absorption device according to claim 1.

8. The absorption device further includes a connecting member having one end in the axial direction connected to the opening and closing member and being movable in the longitudinal direction of the pipe together with the opening and closing member. The connecting member is a hollow shaft member. The heating member is provided in the connecting member. The absorption device according to claim 7.

9. The gas is exhaust gas discharged from an internal combustion engine. The predetermined component is carbon dioxide. The absorption device according to claim 1.

10. When the sliding portion moves in conjunction with the opening and closing member, the sliding portion moves across at least the supply port of the pipe in the axial direction. The absorption device according to any one of claims 1 to 9.

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