Hydrogen-rich tail gas recycling device

Abstract

The utility model relates to a hydrogen-rich tail gas recycling device in the technical field of hydrogen-rich tail gas recycling, which comprises a separating box and a base, the separating box is arranged on the base, a piston ring and a hydrogen separating membrane are arranged in the separating box, and a collecting pipe is arranged at one end of the separating box close to the hydrogen separating membrane and connected with a hydrogen storage system. A gas inlet pipe and a gas outlet pipe are arranged on the side wall of the separation box and located away from the hydrogen separation membrane, a driving structure is arranged on the base and connected with a piston ring, a pressure sensor is arranged on the side, close to the hydrogen separation membrane, of the piston ring, and a gas backflow structure is arranged on the piston ring. Hydrogen penetrates through the hydrogen separation membrane through pressure to enter the hydrogen storage system to be recycled, the gas backflow structure is opened, residual waste gas enters the left side of the piston ring through the gas backflow structure, the gas backflow structure is closed, the piston ring is pulled, and the residual waste gas is discharged to a subsequent treatment system through the gas outlet pipe.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydrogen -rich tail gas recycling technical field especially relates to a hydrogen -rich tail gas recycling device. BACKGROUND

[0002] Hydrogen -rich tail gas refers to the waste gas containing higher concentration hydrogen in the industrial production process. These tail gas usually comes from the production process of oil refining, chemical industry, steel industry, such as coke oven gas, chlor-alkali plant tail gas, synthetic ammonia vent tail gas, etc.

[0003] Hydrogen -rich tail gas has certain economic value, and hydrogen needs to be separated from other gases, and in the prior art, membrane separation technology is usually used to separate hydrogen, such as Chinese patent CN 113426256 B discloses a kind of n-propanol waste gas energy saving and consumption reducing recovery device, hydrogen is separated by hydrogen separation membrane, but the first piston ring of the device is provided with air hole to make waste gas flow, and is opened and closed by automatic telescopic rod and plugging block, so that the air tightness of the first piston ring is reduced, affecting the pressurized separation effect of hydrogen -rich tail gas.

[0004] Therefore, in view of the above problems, a hydrogen -rich tail gas recycling device is proposed to solve the above problems. INVENTION CONTENTS

[0005] The utility model is developed in view of the prior art, and a hydrogen -rich tail gas recycling device is developed, which can pressurize and separate hydrogen in hydrogen -rich tail gas.

[0006] The technical scheme for solving the technical problem of the utility model is as follows: a hydrogen -rich tail gas recycling device, comprising a separation tank and a base, the separation tank is arranged on the base, a piston ring and a hydrogen separation membrane are arranged in the separation tank, a collecting pipe is arranged at one end of the separation tank close to the hydrogen separation membrane, the collecting pipe is connected to a hydrogen storage system, an air inlet pipe and an air outlet pipe are arranged on the side wall of the separation tank, the air inlet pipe and the air outlet pipe are located away from the hydrogen separation membrane, a driving structure is arranged on the base, the driving structure is connected to the piston ring, a pressure sensor is arranged on one side of the piston ring close to the hydrogen separation membrane, and a gas backflow structure is arranged on the piston ring.

[0007] Hydrogen -rich tail gas enters the separation tank through the air inlet pipe, the piston ring in the separation tank moves to pressurize the hydrogen -rich tail gas, and hydrogen passes through the hydrogen separation membrane to enter the hydrogen storage system for recycling by pressure. The pressure sensor adopts DLK301 model, the pressure value of hydrogen -rich tail gas is detected by the pressure sensor, the tail gas pressure is constant after hydrogen passes through the hydrogen separation membrane, the gas backflow structure is opened, the piston ring is continuously pushed, the remaining waste gas enters the left side of the piston ring through the gas backflow structure, the gas backflow structure is closed, the piston ring is pulled, the remaining waste gas is discharged to the subsequent treatment system through the air outlet pipe, and the separation of hydrogen in hydrogen -rich tail gas is realized.

[0008] As a preferred, the driving structure comprises a connecting sleeve and a sealing sleeve, the sealing sleeve is arranged at one end of the separation tank away from the hydrogen separation membrane, the connecting sleeve is slidably connected in the sealing sleeve, the connecting sleeve is connected with the piston ring, the connecting sleeve is arranged on the connecting table, the connecting table is provided with a threaded hole, the first threaded rod is threadedly connected in the threaded hole, the first threaded rod is rotatably connected with the mounting base, the mounting base is arranged on the separation tank, the connecting table is slidably connected with the guide rod, and the guide rod is connected with the separation tank.

[0009] The first threaded rod is rotated under the thread action of the threaded hole to move the connecting table, the connecting table drives the connecting sleeve to push the piston ring to move, the connecting table is slidably connected with the guide rod to prevent the connecting table from rotating, and the connecting sleeve is slidably connected in the sealing sleeve to improve the sealing effect and reduce gas leakage.

[0010] As a preferred, the driving structure further comprises a first motor, a mounting table, a sliding block and a sliding rail, the mounting table is arranged on the base, the mounting table is rotatably connected with the first threaded rod, the mounting table is connected with the guide rod, the first motor is arranged on the base, the output end of the first motor is connected with the first threaded rod, the sliding rail is arranged on the base, the sliding block is slidably connected on the sliding rail, and the sliding block is arranged at the lower end of the connecting table.

[0011] The first motor drives the first threaded rod to rotate to provide power, the connecting table is connected with the sliding rail through the sliding block to support the connecting table and prevent the connecting table from being pressed and bent for a long time to press and bend the first threaded rod and the guide rod.

[0012] As a preferred, the gas backflow structure comprises a gas hole, a piston column, a connecting rod and a through hole, the through hole is arranged in the middle of the piston ring, the through hole is communicated with the connecting sleeve, at least one gas hole is arranged on the inner wall of the connecting sleeve, the piston column is arranged in the connecting sleeve, and the connecting rod is arranged at one end of the piston column away from the piston ring.

[0013] When the gas needs to be backflowed, the piston column is moved, the gas hole is communicated with the through hole, the gas is backflowed, the piston column is connected with the connecting sleeve, and the gas tightness is improved to prevent the gas from flowing out during the pressurization process.

[0014] As a preferred, the gas backflow structure further comprises a second threaded rod, a threaded sleeve, a connecting block, a limiting rod and a limiting hole, the connecting rod is connected with the second threaded rod, the second threaded rod passes through the connecting table, the threaded sleeve is rotatably arranged on one side of the connecting table away from the connecting sleeve, the threaded sleeve is threadedly connected with the second threaded rod, the second threaded rod is arranged on the connecting block, the connecting block is provided with the limiting rod, the limiting rod is slidably connected in the limiting hole, and the limiting hole is arranged on the connecting table.

[0015] As a preferred, the gas backflow structure further comprises a second motor, a gear and a gear ring, the second motor is arranged on the connecting table, the output end of the second motor is connected with the gear, the gear is connected in meshing connection with the gear ring, and the gear ring is sleeved on the threaded sleeve.

[0016] The second motor drives the gear ring to rotate, which in turn drives the threaded sleeve to rotate. The threaded sleeve and the second threaded rod are threaded together, and under the action of the thread, the piston rod moves, controlling the opening and closing of the gas return structure.

[0017] Preferably, the intake pipe is connected to the exhaust gas system and an intake valve is installed on the intake pipe; the exhaust pipe is connected to the waste gas system and an exhaust valve is installed on the exhaust pipe; and a control valve is installed on the collection pipe.

[0018] The flow of gas is controlled by inlet valves, outlet valves, and control valves.

[0019] The effects provided in the utility model description are merely those of the embodiments, and not all the effects of the utility model. The above technical solution has the following advantages or beneficial effects:

[0020] The inlet valve is opened and the outlet valve is closed, allowing the hydrogen-rich exhaust gas to enter the separator. The first motor is started, the inlet valve is closed, and the control valve is opened. The first threaded rod rotates, moving the connecting platform and pushing the piston ring to pressurize the hydrogen-rich exhaust gas. The hydrogen in the exhaust gas is discharged through the hydrogen separation membrane. The control valve is closed and the outlet valve is opened, starting the second motor. The second motor drives the threaded sleeve to rotate, which engages with the second threaded rod, moving the piston rod. The vent hole and the through hole are connected. The first motor is started again, pushing the piston ring to move. The remaining exhaust gas enters the other side of the piston ring through the through hole and the vent hole. When the second motor is started, the piston rod separates the through hole and the vent hole. The first motor is started, pulling the piston ring. The remaining exhaust gas enters the subsequent exhaust gas system through the outlet pipe, achieving the separation of hydrogen in the hydrogen-rich exhaust gas. Attached Figure Description

[0021] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0022] Figure 1 This is a schematic diagram of the structure of this utility model.

[0023] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0024] Figure 3 Appendix to this utility model Figure 2 Enlarged schematic diagram of the structure at point A in the middle.

[0025] Figure 4 Appendix to this utility model Figure 2 Enlarged schematic diagram of the structure at point B.

[0026] Figure 5 Appendix to this utility model Figure 2 Enlarged schematic diagram of the structure at point C.

[0027] In the figure, 1 is a separation tank; 2 is a base; 3 is a piston ring; 4 is a hydrogen separation membrane; 5 is a collecting pipe; 6 is an air inlet pipe; 7 is an air outlet pipe; 8 is a pressure sensor; 9 is a connecting table; 10 is a guide rod; 11 is a first threaded rod; 12 is a connecting sleeve; 13 is a sealing sleeve; 14 is a threaded hole; 15 is a mounting seat; 16 is a first motor; 17 is a mounting table; 18 is a sliding block; 19 is a sliding rail; 20 is an air hole; 21 is a piston column; 22 is a connecting rod; 23 is a through hole; 24 is a second threaded rod; 25 is a threaded sleeve; 26 is a connecting block; 27 is a limiting rod; 28 is a limiting hole; 29 is a second motor; 30 is a gear; 31 is a gear ring; 32 is an air inlet valve; 33 is an air outlet valve; 34 is a control valve. DETAILED DESCRIPTION

[0028] In order to clearly illustrate the technical features of the present scheme, the present utility model will be described in detail below through specific embodiments and in conjunction with the accompanying drawings. The following disclosure provides many different embodiments or examples to implement different structures of the present utility model. In order to simplify the disclosure of the present utility model, the components and settings of specific examples are described below. In addition, the present utility model can repeatedly refer to numbers and / or letters in different examples. Such repetition is for the purpose of simplification and clarity, and in itself does not indicate the relationship between the various embodiments and / or settings being discussed. It should be noted that the components illustrated in the drawings are not necessarily drawn to scale. The present utility model omits the description of known components and processing techniques and processes to avoid unnecessary limitations on the present utility model. The orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present utility model. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present utility model can be understood according to the specific circumstances.

[0029] As Figures 1 to 5As shown, a hydrogen-rich tail gas recycling device, comprising a separation tank 1 and a base 2, the separation tank 1 is arranged on the base 2, a piston ring 3 and a hydrogen separation membrane 4 are arranged in the separation tank 1, a collection pipe 5 is arranged at one end of the separation tank 1 close to the hydrogen separation membrane 4, the collection pipe 5 is connected to a hydrogen storage system, an air inlet pipe 6 and an air outlet pipe 7 are arranged on the side wall of the separation tank 1, the air inlet pipe 6 and the air outlet pipe 7 are both located away from the hydrogen separation membrane 4, a driving structure is arranged on the base 2, the driving structure is connected to the piston ring 3, a pressure sensor 8 is arranged on one side of the piston ring 3 close to the hydrogen separation membrane 4, and a gas backflow structure is arranged on the piston ring 3. The hydrogen-rich tail gas enters the separation tank 1 through the air inlet pipe 6, the piston ring 3 in the separation tank 1 moves to pressurize the hydrogen-rich tail gas, and the hydrogen gas passes through the hydrogen separation membrane 4 to enter the hydrogen storage system for recycling, the pressure sensor 8 adopts DLK301 type, the pressure value of the hydrogen-rich tail gas is detected through the pressure sensor 8, after the hydrogen gas passes through the hydrogen separation membrane 4, the tail gas pressure is constant, the gas backflow structure is opened, the piston ring 3 is continuously pushed, the remaining waste gas enters the left side of the piston ring 3 through the gas backflow structure, the gas backflow structure is closed, the piston ring 3 is pulled, and the remaining waste gas is discharged to the subsequent treatment system through the air outlet pipe 7, realizing the separation of hydrogen in the hydrogen-rich tail gas.

[0030] The driving structure comprises a connecting table 9, a guide rod 10, a first threaded rod 11, a connecting sleeve 12, a sealing sleeve 13, a threaded hole 14 and a mounting seat 15, the sealing sleeve 13 is arranged at one end of the separation tank 1 away from the hydrogen separation membrane 4, the connecting sleeve 12 is slidably connected in the sealing sleeve 13, the connecting sleeve 12 is connected to the piston ring 3, the connecting sleeve 12 is arranged on the connecting table 9, the connecting table 9 is provided with the threaded hole 14, the first threaded rod 11 is threadedly connected in the threaded hole 14, the first threaded rod 11 is rotationally connected to the mounting seat 15, the mounting seat 15 is arranged on the separation tank 1, the connecting table 9 is slidably connected to the guide rod 10, and the guide rod 10 is connected to the separation tank 1. The first threaded rod 11 rotates under the action of the threads in the threaded hole 14 to move the connecting table 9, the connecting table 9 drives the connecting sleeve 12 to push the piston ring 3 to move, the connecting table 9 is slidably connected to the guide rod 10 to prevent the connecting table 9 from rotating, the connecting sleeve 12 is slidably connected in the sealing sleeve 13 to improve the sealing effect and reduce gas leakage.

[0031] The driving structure further comprises a first motor 16, a mounting table 17, a sliding block 18 and a sliding rail 19, the mounting table 17 is arranged on the base 2, the mounting table 17 is rotationally connected to the first threaded rod 11, the mounting table 17 is connected to the guide rod 10, the first motor 16 is arranged on the base 2, the output end of the first motor 16 is connected to the first threaded rod 11, the sliding rail 19 is arranged on the base 2, the sliding block 18 is slidably connected to the sliding rail 19, and the sliding block 18 is arranged at the lower end of the connecting table 9. The first motor 16 drives the first threaded rod 11 to rotate to provide power, the connecting table 9 is connected to the sliding rail 19 through the sliding block 18 to support the connecting table 9 and prevent the connecting table 9 from bending the first threaded rod 11 and the guide rod 10 after long-term use.

[0032] The gas backflow structure comprises the gas hole 20, the piston column 21, the connecting rod 22 and the through hole 23, the middle part of the piston ring 3 is provided with the through hole 23, the through hole 23 is communicated with the connecting sleeve 12, at least one gas hole 20 is arranged on the inner wall of the connecting sleeve 12, the piston column 21 is arranged in the connecting sleeve 12, and the connecting rod 22 is arranged at the end of the piston column 21 away from the piston ring 3. When the gas backflow is needed, the piston column 21 is moved, the gas hole 20 is communicated with the through hole 23, the gas backflow is realized, the piston column 21 is connected with the connecting sleeve 12, the air tightness is improved, and the gas outflow of the piston ring 3 in the pressurizing process is prevented.

[0033] The gas backflow structure further comprises the second threaded rod 24, the threaded sleeve 25, the connecting block 26, the limiting rod 27 and the limiting hole 28, the connecting rod 22 is connected with the second threaded rod 24, the second threaded rod 24 passes through the connecting table 9, the threaded sleeve 25 is rotationally arranged on the side of the connecting table 9 away from the connecting sleeve 12, the threaded sleeve 25 is threadedly connected with the second threaded rod 24, the second threaded rod 24 is arranged on the connecting block 26, the connecting block 26 is provided with the limiting rod 27, the limiting rod 27 is slidingly connected in the limiting hole 28, and the limiting hole 28 is arranged on the connecting table 9.

[0034] The gas backflow structure further comprises the second motor 29, the gear 30 and the gear ring 31, the second motor 29 is arranged on the connecting table 9, the output end of the second motor 29 is connected with the gear 30, the gear 30 is meshingly connected with the gear ring 31, and the gear ring 31 is sleeved on the threaded sleeve 25. The second motor 29 drives the gear 30 and the gear ring 31 to rotate, thereby driving the threaded sleeve 25 to rotate, the threaded sleeve 25 and the second threaded rod 24 are threadedly matched, the piston column 21 is driven to move under the action of the thread, and the opening and closing of the gas backflow structure are controlled.

[0035] The gas inlet pipe 6 is connected with the tail gas system, the gas inlet valve 32 is arranged on the gas inlet pipe 6, the gas outlet pipe 7 is connected with the waste gas system, the gas outlet valve 33 is arranged on the gas outlet pipe 7, and the control valve 34 is arranged on the collecting pipe 5. The flow of the gas is controlled through the gas inlet valve 32, the gas outlet valve 33 and the control valve 34.

[0036] Working principle: the inlet valve 32 is opened, the outlet valve 33 is closed, the hydrogen-rich tail gas enters into the separation tank 1, the first motor 16 is started, the inlet valve 32 is closed, the control valve 34 is opened, the first threaded rod 11 rotates to drive the connecting table 9 to move, the piston ring 3 is pushed to pressurize the hydrogen-rich tail gas, the hydrogen in the hydrogen-rich tail gas is discharged through the hydrogen separation membrane 4, the control valve 34 is closed and the outlet valve 33 is opened, the second motor 29 is started, the second motor 29 drives the threaded sleeve 25 to rotate, the threaded sleeve 25 cooperates with the second threaded rod 24 to drive the piston column 21 to move, the air hole 20 is communicated with the through hole 23, the first motor 16 is continuously started to drive the piston ring 3 to move, the remaining waste gas enters into the other side of the piston ring 3 through the through hole 23 and the air hole 20, the piston column 21 separates the through hole 23 and the air hole 20 when the second motor 29 is started, the first motor 16 is started to pull the piston ring 3, and the remaining waste gas enters into the subsequent waste gas system through the outlet pipe 7.

[0037] Although the specific embodiments of the utility model are described above in combination with the drawings, it is not a limitation on the protection scope of the utility model, various modifications or changes made by the person skilled in the art on the basis of the technical scheme of the utility model without creative labor are still within the protection scope of the utility model.

Claims

1. A hydrogen-rich tail gas recycling device, comprising a separation tank (1) and a base (2), characterized in that: The separation tank (1) is arranged on the base (2), the piston ring (3) and the hydrogen separation membrane (4) are arranged in the separation tank (1), the collection pipe (5) is arranged at one end of the separation tank (1) close to the hydrogen separation membrane (4), the collection pipe (5) is connected with the hydrogen storage system, the air inlet pipe (6) and the air outlet pipe (7) are arranged on the side wall of the separation tank (1), the air inlet pipe (6) and the air outlet pipe (7) are located away from the hydrogen separation membrane (4), the driving structure is arranged on the base (2), the driving structure is connected with the piston ring (3), the pressure sensor (8) is arranged on the side of the piston ring (3) close to the hydrogen separation membrane (4), and the gas backflow structure is arranged on the piston ring (3).

2. The hydrogen-rich tail gas recycling device according to claim 1, characterized in that: The driving structure comprises a connecting sleeve (12) and a sealing sleeve (13), the sealing sleeve (13) is arranged at one end of the separation tank (1) away from the hydrogen separation membrane (4), the connecting sleeve (12) is slidably connected in the sealing sleeve (13), the connecting sleeve (12) is connected with the piston ring (3), the connecting sleeve (12) is arranged on the connecting table (9), the connecting table (9) is provided with a threaded hole (14), the first threaded rod (11) is screwed in the threaded hole (14), the first threaded rod (11) is rotatably connected with the mounting seat (15), the mounting seat (15) is arranged on the separation tank (1), and the connecting table (9) is slidably connected with the guide rod (10). The guide rod (10) is connected with the separation tank (1).

3. The hydrogen-rich tail gas recycling device according to claim 2, characterized in that: The driving structure further comprises a first motor (16) and a mounting table (17), the mounting table (17) is arranged on the base (2), the mounting table (17) is rotatably connected with the first threaded rod (11), the mounting table (17) is connected with the guide rod (10), the first motor (16) is arranged on the base (2), the output end of the first motor (16) is connected with the first threaded rod (11), the sliding rail (19) is arranged on the base (2), the sliding block (18) is slidably connected on the sliding rail (19), and the sliding block (18) is arranged at the lower end of the connecting table (9).

4. The hydrogen-rich tail gas recycling device according to claim 1, characterized in that: The gas backflow structure comprises a gas hole (20) and a through hole (23), the through hole (23) is arranged in the middle of the piston ring (3), the through hole (23) is communicated with the connecting sleeve (12), at least one gas hole (20) is arranged on the inner wall of the connecting sleeve (12), the piston column (21) is arranged in the connecting sleeve (12), and the connecting rod (22) is arranged at one end of the piston column (21) away from the piston ring (3).

5. The hydrogen-rich off-gas recycling device according to claim 4, characterized in that: The gas backflow structure further comprises a second threaded rod (24) and a threaded sleeve (25), the connecting rod (22) is connected with the second threaded rod (24), the second threaded rod (24) passes through the connecting table (9), the threaded sleeve (25) is arranged on the side of the connecting table (9) away from the connecting sleeve (12), the threaded sleeve (25) is threadedly connected with the second threaded rod (24), the second threaded rod (24) is arranged on a connecting block (26), the connecting block (26) is provided with a limiting rod (27), the limiting rod (27) is slidably connected in a limiting hole (28), and the limiting hole (28) is arranged on the connecting table (9).

6. The hydrogen-rich off-gas recycling device according to claim 5, characterized in that: The gas backflow structure further comprises a second motor (29), a gear (30) and a gear ring (31), the second motor (29) is arranged on the connecting table (9), the output end of the second motor (29) is connected with the gear (30), the gear (30) is in meshing connection with the gear ring (31), and the gear ring (31) is sleeved on the threaded sleeve (25).

7. The hydrogen-rich off-gas recycling device according to claim 1, characterized in that: The air inlet pipe (6) is connected with an exhaust system, the air inlet valve (32) is arranged on the air inlet pipe (6), the air outlet pipe (7) is connected with an exhaust system, the air outlet valve (33) is arranged on the air outlet pipe (7), and the collecting pipe (5) is provided with a control valve (34).

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