A PSA off-gas recovery device

Abstract

The utility model relates to the field of chemical tail gas recovery, especially a kind of PSA tail gas recovery device, including gas collecting tank, gas collecting tank side is equipped with recovery mechanism, recovery mechanism side is equipped with booster gas pump, recovery mechanism rear side is equipped with biochemical mechanism, still include filter dust mechanism and drying cabinet, filter dust mechanism is located between booster gas pump and recovery mechanism, drying cabinet is located between recovery mechanism and gas collecting tank. The flow of tail gas is used to drive the impeller to rotate, and the impeller drives the rotating shaft to rotate synchronously. At this time, the pusher seat is moved by the impact frame, and the spring drives the impact frame to reset and impact the limiting seat at the center of the filter dust screen. The vibration generated by the impact shakes off the dust on the outside of the filter dust screen, preventing the dust from clogging the filter dust screen and reducing the pressure. The drying cabinet is used to dry the tail gas.

Description

Technical Field

[0001] This utility model relates to the field of chemical tail gas recovery, and in particular to a PSA tail gas recovery device. Background Technology

[0002] PSA tail gas refers to the gas mixture that is not completely adsorbed after adsorption treatment in the pressure swing adsorption (PSA) process. These tail gases usually contain combustible components such as CO, CO2, and CH4, as well as a small amount of unadsorbed H2. They have calorific value and can be recycled as fuel gas. According to the patent document with publication number CN223042468U, exhaust gas is delivered into the gas storage frame through an air inlet pipe and discharged from the air outlet of the air supply pipe to move it. At this time, the air supply pipe drives the rotating rod to rotate through the connecting rod. Then the rotating rod drives the connecting frame, the water storage sleeve on top, and the rotating frame to rotate. During this process, the treatment liquid that enters the rotating frame and the water storage sleeve through the water supply pipe is sprayed out from the nozzle to recover the oxygen in the recovery tank. At the same time, the exhaust gas can be filtered again through the filter screen and then enter the recovery tank. The buffer layer allows the exhaust gas and the treatment liquid to react fully. The patent document describes a process for recovering exhaust gas. Since the entire mechanical structure relies on the flow of exhaust gas to operate, the exhaust gas's speed is slowed as it passes through a buffer layer and is also filtered by a filter. This obstruction of the exhaust gas's exit results in significant energy loss and relatively low driving force. Furthermore, if the exhaust gas contains dust or other impurities, it can clog the filter, further hindering the structure's operation. Additionally, the gas after reacting with the treatment fluid may contain a large amount of moisture and residual treatment fluid, affecting its subsequent use or storage. Utility Model Content

[0003] The purpose of this invention is to provide a PSA exhaust gas recovery device to solve the above-mentioned problems.

[0004] This utility model achieves the above objectives through the following technical solutions: A PSA exhaust gas recovery device includes a gas collection tank, a recovery mechanism on one side of the gas collection tank, a booster pump on one side of the recovery mechanism, a biochemical mechanism on the rear side of the recovery mechanism, a dust filtration mechanism and a drying box, the dust filtration mechanism being located between the booster pump and the recovery mechanism, and the drying box being located between the recovery mechanism and the gas collection tank. The dust filtration mechanism includes a dust hood, a collection box fixed at the bottom of the dust hood, two symmetrically arranged isolation plates inserted into the front of the collection box, a dust filter plate fixed inside the dust hood, a limiting seat at the center of the dust filter plate, and a rotating shaft rotatably connected to the center of the limiting seat. An impeller is fixed at one end of the rotating shaft, and a toggle seat is fixed at the other end of the rotating shaft. An impact frame is provided on the other side of the limiting seat, and a push seat that cooperates with the toggle seat is fixed inside the impact frame. A spring is sleeved on the outside of the push seat.

[0005] Preferably, three circumferentially distributed impact pillars are fixed on the side of the impact frame near the limiting seat, and the spring is located inside the three impact pillars.

[0006] Preferably, the other end of the limiting seat of the dust filter plate is fixedly connected to one end of the spring, and the impact frame is fixedly connected to the other end of the spring.

[0007] Preferably, the recycling mechanism includes an air inlet pipe, one end of which is fixedly connected to the other end of the dust filter hood. A four-way pipe is fixedly connected to the other end of the air inlet pipe. Air inlet valves are fixed on the front and rear sides and the lower end of the upper end of the four-way pipe. A first recycling tank and a second recycling tank are provided on the other side of the air inlet valves. The upper ends of the first recycling tank and the second recycling tank are connected to each other through a connecting pipe. A bend is fixed to the lower end of both the first recycling tank and the second recycling tank. The bend of the first recycling tank is connected to the lower end of the four-way pipe. An outlet valve is fixed on the bend of the second recycling tank.

[0008] Preferably, both the first and second recovery tanks are filled with adsorbents for adsorbing different gases in the exhaust gas. The adsorbent in the first recovery tank is a carbon molecular sieve, and the adsorbent in the second recovery tank is a zeolite molecular sieve. Pressure sensors for detecting the internal pressure of both tanks are fixed on their sides.

[0009] Preferably, the bend in the second recovery tank is connected to one end of the drying chamber, and the drying chamber contains a desiccant for removing moisture from the exhaust gas.

[0010] Preferably, the biochemical mechanism includes a U-shaped tube, the front end of which is connected to the bend of the first recovery tank and the bend of the second recovery tank respectively, and two symmetrically arranged control valves are fixed on the front side of the U-shaped tube, and a vacuum pump for evacuating air is provided at the rear end of the U-shaped tube.

[0011] The advantages compared to existing technologies are as follows: The flow of exhaust gas drives the impeller to rotate, and the impeller drives the shaft to rotate synchronously with the actuating seat. At this time, the actuating seat pushes the push seat to move the impact frame. During this process, the spring drives the impact frame to reset and impact the limit seat at the center of the dust filter plate. The vibration generated by the impact shakes off the dust on the outside of the dust filter plate, preventing dust from clogging the dust filter plate and causing a drop in pressure. At the same time, the exhaust gas is dried in the drying box. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a perspective view of a PSA exhaust gas recovery device according to the present invention; Figure 2 This is a side view of a PSA exhaust gas recovery device according to the present invention; Figure 3 yes Figure 2 Sectional view at point AA; Figure 4 This is a schematic diagram of the biochemical mechanism of a PSA exhaust gas recovery device according to the present invention; Figure 5 This is a schematic diagram of the impeller structure of a PSA exhaust gas recovery device according to the present invention; Figure 6 This is a schematic diagram of the impact frame structure of the PSA exhaust gas recovery device described in this utility model; Figure 7 This is a schematic diagram of the spring structure of a PSA exhaust gas recovery device according to the present invention; Figure 8 This is a schematic diagram of the toggle seat structure of the PSA exhaust gas recovery device described in this utility model.

[0014] The annotations in the attached figures are explained as follows: 1. Booster air pump; 2. Dust filtration mechanism; 3. Recovery mechanism; 4. Biochemical mechanism; 5. Drying oven; 6. Gas collection tank; 21. Dust filter hood; 22. Collection box; 23. Isolation plate; 24. Dust filter screen; 25. Impeller; 26. Shaft; 27. Actuating seat; 28. Impact frame; 29. ​​Pushing seat; 31. Inlet pipe; 32. Four-way pipe; 33. Inlet valve; 34. First recovery tank; 35. Second recovery tank; 36. Outlet valve; 37. Pressure sensor; 38. Connecting pipe; 39. Bend; 41. U-shaped pipe; 42. Vacuum pump; 43. Control valve. Detailed Implementation

[0015] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. All electrical components mentioned in this document are electrically connected to an external main controller and 220V AC mains power, and the main controller can be a conventionally known device such as a computer that provides control.

[0016] The present invention will be further described below with reference to the accompanying drawings: like Figures 1-8 As shown, a PSA exhaust gas recovery device includes a gas collection tank 6, a recovery mechanism 3 on one side of the gas collection tank 6, a booster pump 1 on one side of the recovery mechanism 3, a biochemical mechanism 4 on the rear side of the recovery mechanism 3, a dust filter mechanism 2 and a drying box 5. The dust filter mechanism 2 is located between the booster pump 1 and the recovery mechanism 3, and the drying box 5 is located between the recovery mechanism 3 and the gas collection tank 6.

[0017] In this embodiment: the dust filtration mechanism 2 includes a dust hood 21, a collection box 22 is fixed to the bottom of the dust hood 21, two symmetrically arranged isolation plates 23 are inserted into the front of the collection box 22, a dust filter plate 24 is fixed inside the dust hood 21, a limiting seat is provided at the center of the dust filter plate 24, and a rotating shaft 26 is rotatably connected to the center of the limiting seat. An impeller 25 is fixed to one end of the rotating shaft 26, and a toggle seat 27 is fixed to the other end of the rotating shaft 26. An impact frame 28 is provided on the other side of the limiting seat, and a push seat 29 that cooperates with the toggle seat 27 is fixed inside the impact frame 28. A spring is sleeved on the outside of the push seat 29, and three impact frames are fixed on the side of the impact frame 28 near the limiting seat. The impact columns are distributed circumferentially, with springs located inside the three impact columns. The other end of the limiting seat of the dust filter plate 24 is fixedly connected to one end of the spring, and the impact frame 28 is fixedly connected to the other end of the spring. A booster pump 1 continuously supplies exhaust gas into the dust filter hood 21. As the exhaust gas passes through the dust filter plate 24, the dust and debris in the exhaust gas are filtered. Simultaneously, as the exhaust gas flows from the dust filter hood 21 into the recycling mechanism 3, the impeller 25 drives the rotating shaft 26 to rotate on the limiting seat of the dust filter plate 24. The rotation of the rotating shaft 26 drives the actuating seat 27 to rotate. At this time, since the push seat 29 is fixedly connected to the impact frame 28... Simultaneously, the impact bracket 28 is spring-tensioned to the other side of the limiting seat. Therefore, during the rotation of the actuating seat 27, it pushes the pusher seat 29 away from the limiting seat. At the same time, the spring inside the impact bracket 28 is pulled by the rope, and the three impact pins on the impact bracket 28 are pulled a certain distance away from the other side of the limiting seat. When the actuating seat 27 rotates through a certain angle, the actuating seat 27 disengages from pushing the pusher seat 29. At this time, the spring will drive the impact bracket 28 and the pusher seat 29 to quickly return to one side of the limiting seat. During this process, the three impact pins on one side of the impact bracket 28 will collide with the other side of the limiting seat. The vibration generated by this collision will be transmitted through the limiting seat to the other side of the limiting seat. The dust and debris accumulated on the dust filter plate 24 are shaken off, and the shaken-off dust and debris slide along the inner wall of the dust cover 21 and collect in the collection box 22. At this time, the dust and debris falling into the collection box 22 will gather on the uppermost isolation plate 23. When it is necessary to clean the dust and debris in the collection box 22, first pull out the uppermost isolation plate 23 of the collection box 22, and then the dust and debris gathered on the uppermost isolation plate 23 will fall into the lowermost isolation plate 23. Then, insert the uppermost isolation plate 23 again, and then pull out the lowermost isolation plate 23 to clean the dust and debris.

[0018] In this embodiment: the recycling mechanism 3 includes an air inlet pipe 31, one end of which is fixedly connected to the other end of the dust filter hood 21. A four-way pipe 32 is fixedly connected to the other end of the air inlet pipe 31. Air inlet valves 33 are fixedly installed on both the front and rear sides of the upper end and at the lower end of the four-way pipe 32. A first recycling tank 34 and a second recycling tank 35 are provided on the other side of the air inlet valves 33. The upper ends of the first recycling tank 34 and the second recycling tank 35 are connected to each other through a connecting pipe 38. A bent pipe 39 is fixedly installed at the lower end of both the first recycling tank 34 and the second recycling tank 35. The bend 39 of tank 34 is connected to the lower end of the four-way pipe 32. A discharge valve 36 is fixed to the bend 39 of the second recovery tank 35. Both the first recovery tank 34 and the second recovery tank 35 are filled with adsorbents for adsorbing different gases in the exhaust gas. The adsorbent in the first recovery tank 34 is a carbon molecular sieve, and the adsorbent in the second recovery tank 35 is a zeolite molecular sieve. Pressure sensors 37 for detecting the internal pressure of both tanks are fixed to the sides of both tanks 34 and 35. The bend 39 of the second recovery tank 35... 39 is connected to one end of the drying chamber 5. The drying chamber 5 contains a desiccant to remove moisture from the exhaust gas. The exhaust gas sent out from the dust filter hood 21 passes through the inlet pipe 31 and the four-way pipe 32 into the first recovery tank 34. At this time, the exhaust gas enters from the bottom of the first recovery tank 34 and is adsorbed by the carbon molecular sieve inside. Then, it is sent out from the top of the first recovery tank 34 into the connecting pipe 38. The exhaust gas is then sent from the connecting pipe 38 into the top of the second recovery tank 35. At this time, the exhaust gas enters from the top of the second recovery tank 35 and passes through the zeolite molecular sieve. The adsorbent is then sent to the drying chamber 5 through the bent pipe 39 at the bottom of the second recovery tank 35. During this process, the pressure in the first recovery tank 34 and the second recovery tank 35 is detected by two pressure sensors 37. The adsorption of the adsorbent in the first recovery tank 34 and the second recovery tank 35 can be adjusted by controlling the pressure of the exhaust gas sent by the booster pump 1. In addition, two other sets of first recovery tanks 34 and second recovery tanks 35 can be connected through the air inlet valve 33 at the upper end of the four-way pipe 32, so as to achieve uninterrupted exhaust gas recovery.

[0019] In this embodiment: the biochemical mechanism 4 includes a U-shaped tube 41. The front end of the U-shaped tube 41 is connected to the bend 39 of the first recovery tank 34 and the bend 39 of the second recovery tank 35, respectively. Two symmetrically arranged control valves 43 are fixed on the front side of each U-shaped tube 41. A vacuum pump 42 for evacuating air is provided at the rear end of the U-shaped tube 41. When the exhaust gas adsorbed by the adsorbent in the first recovery tank 34 and the second recovery tank 35 is saturated, any one of the four-way pipes 32 at the upper end of the four-way pipe 32 is opened. At this time, the exhaust gas sent in by the inlet pipe 31 can be sent to the next set of first recovery tanks 34 and second recovery tanks 35 for adsorption. Then, the inlet valve 33 and outlet valve 36 at the lower end of the four-way pipe 32 are closed. At the same time, the control valve 43 on one side of the U-shaped tube 41 is opened and the vacuum pump 42 is started. At this time, one side of the U-shaped tube 41 is connected to the first recovery tank 34. Then the vacuum pump 42... By evacuating the first recovery tank 34 through one side of the U-tube 41, the adsorbed gas in the carbon molecular sieve of the first recovery tank 34 is extracted and stored. After the gas in the carbon molecular sieve of the first recovery tank 34 is cleaned, the control valve 43 on one side of the U-tube 41 is closed, and then the control valve 43 on the other side of the U-tube 41 is opened. At this time, the vacuum pump 42 evacuates the second recovery tank 35 through the U-tube 41. At this time, the gas adsorbed by the zeolite molecular sieve in the second recovery tank 35 is extracted and stored by the vacuum pump 42. After the gas adsorbed in the first recovery tank 34 and the second recovery tank 35 are completely extracted, the inlet valve 33 and the outlet valve 36 at the lower end of the four-way pipe 32 are reopened while the two control valves 43 on the front side of the U-tube 41 are closed, so that the adsorption of the tail gas can be restarted.

[0020] Working Principle: In operation, the exhaust gas to be recovered is first sent into the dust filter hood 21 by the booster air pump 1. The exhaust gas entering the dust filter hood 21 passes through the dust filter plate 24, where it filters dust and debris. Simultaneously, as the exhaust gas flows from the dust filter hood 21 into the recovery mechanism 3, the impeller 25 drives the rotating shaft 26 to rotate on the limit seat of the dust filter plate 24. The rotation of the rotating shaft 26 drives the actuating seat 27 to rotate. Since the push seat 29 is fixedly connected to the impact frame 28, and the impact frame 28 is spring-tensioned to the other side of the limit seat, the rotation of the actuating seat 27 pushes the push seat 29 away from the limit seat. At the same time, the spring inside the impact frame 28 is pulled by the rope, and the three impact pillars on the impact frame 28 are pulled a certain distance away from the other side of the limit seat. When the actuating seat 27 rotates through a certain angle, it disengages. When the pusher seat 29 is pushed, the spring will drive the impact frame 28 and the pusher seat 29 to quickly reset to one side of the limit seat. During this process, the three impact columns on one side of the impact frame 28 will collide with the other side of the limit seat. The vibration generated by the collision will be transmitted to the dust filter plate 24 through the limit seat, thereby shaking off the dust and debris accumulated on the dust filter plate 24. The shaken-off dust and debris will slide along the inner wall of the dust cover 21 and collect in the collection box 22. At this time, the dust and debris falling into the collection box 22 will accumulate on the uppermost isolation plate 23. When it is necessary to clean the dust and debris in the collection box 22, first pull out the uppermost isolation plate 23 of the collection box 22, and then the dust and debris accumulated on the uppermost isolation plate 23 will fall into the lowermost isolation plate 23. Then, insert the uppermost isolation plate 23 again, and then pull out the lowermost isolation plate 23, so that the dust and debris can be cleaned. In addition, the exhaust gas sent from the dust filter hood 21 will enter the first recovery tank 34 through the air inlet pipe 31 and the four-way pipe 32. At this time, the exhaust gas will enter from the bottom of the first recovery tank 34 and be adsorbed by the carbon molecular sieve inside. Then, it will be sent from the top of the first recovery tank 34 to the connecting pipe 38. The exhaust gas will then be sent from the connecting pipe 38 to the top of the second recovery tank 35. At this time, the exhaust gas will enter from the top of the second recovery tank 35 and be adsorbed by the zeolite molecular sieve. Then, it will be sent from the bent pipe 39 at the bottom of the second recovery tank 35 to the drying box 5. During this process, the pressure in the first recovery tank 34 and the second recovery tank 35 is detected by two pressure sensors 37. The adsorption of the adsorbent in the first recovery tank 34 and the second recovery tank 35 can be adjusted by controlling the pressure of the exhaust gas sent by the booster pump 1. In addition, the air inlet valve 33 at the upper end of the four-way pipe 32 can connect to two other sets of first recovery tanks 34 and second recovery tanks 35, thereby realizing uninterrupted exhaust gas recovery. When the adsorbent in the first recovery tank 34 and the second recovery tank 35 is saturated with the tail gas, open any one of the four-way pipes 32 at the top. At this time, the tail gas sent in through the inlet pipe 31 can be sent to the next set of first recovery tanks 34 and second recovery tanks 35 for adsorption. Then, close the inlet valve 33 and outlet valve 36 at the bottom of the four-way pipe 32, and at the same time open the control valve 43 on one side of the U-shaped pipe 41 and start the vacuum pump 42. At this time, one side of the U-shaped pipe 41 is connected to the first recovery tank 34. Then, the vacuum pump 42 evacuates the air inside the first recovery tank 34 through one side of the U-shaped pipe 41, thereby extracting and storing the adsorbed gas in the carbon molecular sieve in the first recovery tank 34. After the gas in the carbon molecular sieve in 34 is cleaned, the control valve 43 on one side of the U-tube 41 is closed, and then the control valve 43 on the other side of the U-tube 41 is opened. At this time, the vacuum pump 42 pumps gas into the second recovery tank 35 through the U-tube 41. At this time, the gas adsorbed by the zeolite molecular sieve in the second recovery tank 35 is extracted and stored by the vacuum pump 42. After the gas adsorbed in the first recovery tank 34 and the second recovery tank 35 is completely extracted, the inlet valve 33 and outlet valve 36 at the lower end of the four-way pipe 32 are reopened while the two control valves 43 on the front side of the U-tube 41 are closed, so that the adsorption of the tail gas can be restarted.

[0021] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A PSA exhaust gas recovery device, comprising a gas collection tank (6), a recovery mechanism (3) provided on one side of the gas collection tank (6), a booster pump (1) provided on one side of the recovery mechanism (3), and a biochemical mechanism (4) provided at the rear of the recovery mechanism (3), characterized in that: It also includes a dust filtration mechanism (2) and a drying chamber (5), wherein the dust filtration mechanism (2) is located between the booster pump (1) and the recovery mechanism (3), and the drying chamber (5) is located between the recovery mechanism (3) and the gas collection tank (6); The dust filtration mechanism (2) includes a dust hood (21), a collection box (22) is fixed at the bottom of the dust hood (21), two isolation plates (23) arranged symmetrically on the front side of the collection box (22), a dust filter plate (24) is fixed inside the dust hood (21), a limiting seat is provided at the center of the dust filter plate (24), and a rotating shaft (26) is rotatably connected to the center of the limiting seat. An impeller (25) is fixed at one end of the rotating shaft (26), and a toggle seat (27) is fixed at the other end of the rotating shaft (26). An impact frame (28) is provided on the other side of the limiting seat. A push seat (29) that cooperates with the toggle seat (27) is fixed inside the impact frame (28), and a spring is sleeved on the outside of the push seat (29).

2. The PSA exhaust gas recovery device according to claim 1, characterized in that: The impact frame (28) has three circumferentially distributed impact columns fixed on the side near the limiting seat, and the spring is located inside the three impact columns.

3. The PSA exhaust gas recovery device according to claim 1, characterized in that: The other end of the limiting seat of the dust filter plate (24) is fixedly connected to one end of the spring, and the impact frame (28) is fixedly connected to the other end of the spring.

4. The PSA exhaust gas recovery device according to claim 1, characterized in that: The recycling mechanism (3) includes an air inlet pipe (31), one end of which is fixedly connected to the other end of the dust filter hood (21). The other end of the air inlet pipe (31) is fixedly connected to a four-way pipe (32). An air inlet valve (33) is fixedly installed on the front and rear sides and the lower end of the upper end of the four-way pipe (32). A first recycling tank (34) and a second recycling tank (35) are provided on the other side of the air inlet valve (33). The upper ends of the first recycling tank (34) and the second recycling tank (35) are connected to each other through a connecting pipe (38). The lower ends of the first recycling tank (34) and the second recycling tank (35) are fixedly installed with a bend pipe (39). The bend pipe (39) of the first recycling tank (34) is connected to the lower end of the four-way pipe (32). An outlet valve (36) is fixedly installed on the bend pipe (39) of the second recycling tank (35).

5. A PSA exhaust gas recovery device according to claim 4, characterized in that: The interior of the first recovery tank (34) and the second recovery tank (35) is filled with adsorbents for adsorbing different gases in the exhaust gas. The adsorbent in the first recovery tank (34) is a carbon molecular sieve, and the adsorbent in the second recovery tank (35) is a zeolite molecular sieve. Pressure sensors (37) for detecting the internal pressure of the two are fixed on the sides of the first recovery tank (34) and the second recovery tank (35).

6. A PSA exhaust gas recovery device according to claim 4, characterized in that: The bend (39) of the second recovery tank (35) is connected to one end of the drying box (5), and the drying box (5) contains a desiccant for removing moisture from the exhaust gas.

7. A PSA exhaust gas recovery device according to claim 4, characterized in that: The biochemical device (4) includes a U-shaped tube (41), the front end of which is connected to the bend (39) of the first recovery tank (34) and the bend (39) of the second recovery tank (35), and two symmetrically arranged control valves (43) are fixed on the front side of the U-shaped tube (41), and a vacuum pump (42) for evacuating air is provided at the rear end of the U-shaped tube (41).

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