PSA (pressure swing adsorption) tower for hydrogen production and adsorption process

Abstract

The invention relates to the technical field of gas separation, and discloses a PSA (pressure swing adsorption) tower for hydrogen production and an adsorption technology.The PSA tower for hydrogen production comprises an adsorption tower, the adsorption tower comprises a tower body, a gas inlet formed in the bottom of the tower body, a gas outlet formed in the top of the tower body, a filler hole and an adsorption unit filled in the tower body, the distribution mechanism is arranged in the tower body and is positioned above the air inlet hole, and the distribution mechanism comprises a disc fixedly connected to the inner wall of the tower body, a plurality of groups of air distribution channels formed in the disc, a base fixedly connected to the bottom of the disc and a plurality of groups of air transmission channels formed in the base; the multiple groups of gas distribution channels are annularly distributed at equal intervals outwards by taking the center of the disc as a reference, the gas transmission channels and the gas distribution channels are in one-to-one correspondence and are communicated, and every two adjacent groups of gas transmission channels are communicated through a connecting channel. By arranging the distribution mechanism, the purification efficiency of hydrogen can be improved, and meanwhile, the adsorption treatment capacity on pollutants in gas is enhanced.

Description

A PSA (Pressure Swing Adsorption) tower and adsorption process for hydrogen production Technical Field

[0001] This invention relates to the field of gas separation technology, and in particular to a PSA pressure swing adsorption tower and adsorption process for hydrogen production. Background Technology

[0002] In the field of hydrogen production, pressure swing adsorption (PSA) technology achieves the separation and purification of mixed gases based on the principle of physical adsorption. It utilizes the differences in the adsorption capacity of adsorbents for different components in a mixed gas, as well as the characteristic that the adsorption capacity changes with partial pressure and temperature, to achieve gas separation and purification. In the hydrogen production process, the gas enters the adsorption tower under pressure and sequentially completes processes such as adsorption, multi-stage pressure equalization and depressurization, staged forward release, reverse release, rinsing and regeneration, and pressure equalization and pressurization. Through the cyclical "adsorption-regeneration" operation, not only can hydrogen be efficiently purified from the gas, providing a guarantee for clean energy supply, but also, in terms of air pollution control, this technology can effectively remove harmful components from industrial waste gas, helping to improve air quality.

[0003] A radial flow equalization pressure swing adsorption tower disclosed in CN116351202A includes an adsorption tower mechanism. The bottom of the adsorption tower mechanism is provided with a processing mechanism, which includes a processing box and a placement tray. A sealing ring is provided on the front surface of the processing box. A rectangular plate is bonded to the front surface of the sealing ring. Two connecting blocks are fixed on both sides of the rectangular plate. A servo motor is installed on one side of the processing box, and a controller is installed on another side. A perforated connecting pipe is fixed through one side of the processing box. A perforated plate is fixed inside the processing box near the top.

[0004] Although the above-mentioned technical solutions can remove water molecules, dust and oil molecules mixed in the raw gas through the processing mechanism, and have the advantage of avoiding carbon molecular sieve poisoning and loss of activity in the pressure swing adsorption tower, in the traditional pressure swing adsorption process, when the gas flows into the adsorption tower axially from the bottom of the tower, due to the boundary layer effect of the wall, the flow velocity in the central region is significantly higher than that in the edge region. The resulting difference between dynamic and static pressure causes the gas to converge towards the center, creating a low-velocity dead zone in the edge region. As a result, the adsorbent fails to make sufficient contact with the gas, and a large number of adsorption sites are in an idle state. At the same time, the adsorption load is concentrated in the central region due to the excessively high flow velocity, which easily leads to premature breakthrough and forced shortening of the adsorption time, thereby affecting the adsorption efficiency and product purity. Currently, the static distributor commonly used in existing technologies can achieve a certain degree of airflow uniformity under initial operating conditions, but its fixed structure is difficult to continuously balance the changes in dynamic operating conditions. Summary of the Invention

[0005] The purpose of this invention is to provide a PSA pressure swing adsorption tower and adsorption process for hydrogen production, in order to solve the problem mentioned in the background art that the gas in the traditional adsorption tower flows along a single axis, resulting in edge effects and low local mass transfer efficiency.

[0006] This invention provides a PSA (Pressure Swing Adsorption) tower and adsorption process for hydrogen production, employing the following technical solution: A PSA tower for hydrogen production includes: an adsorption tower, comprising a tower body, an inlet at the bottom of the tower body, an outlet at the top, packing holes, and adsorption units filled within the tower body; and a distribution mechanism disposed within the tower body and located above the inlet. The distribution mechanism includes a disc fixedly connected to the inner wall of the tower body, multiple sets of gas distribution channels disposed within the disc, a base fixedly connected to the bottom of the disc, and multiple sets of gas delivery channels disposed within the base. The system comprises multiple sets of air distribution channels arranged in a ring with equal spacing outwards from the center of the disc. Each air delivery channel corresponds to and is connected to the air distribution channel. Adjacent sets of air delivery channels are connected by connecting channels. Each set of air delivery channels is equipped with a shielding plate, and each set of air delivery channels has a lower baffle fixedly connected to its inner sidewall. A telescopic unit is provided between the shielding plate and the corresponding lower baffle. In the initial state, the shielding plate is located at the bottom of the lower baffle and is higher than the connecting channel, and the air delivery channel is in a closed state. When air is released, the adjacent sets of shielding plates alternately rise and fall along the axis of the air delivery channel to form an airflow channel.

[0007] Furthermore, the telescopic unit includes multiple sets of connecting rods fixedly connected to the shielding plate, each set of connecting rods movably passing through the corresponding lower stop bar, and each set of connecting rods is equipped with a spring.

[0008] Furthermore, an alternating mechanism is provided inside the tower body, located below the shielding plate. The alternating mechanism includes two sets of parallel shafts, both ends of which are rotatably connected to the tower body. Each set of shafts has multiple sets of connecting ropes wound at equal intervals along the axial direction, and the connecting ropes on the two sets of shafts are arranged in an interlaced manner. The other end of the connecting rope is fixedly connected to the connecting seat at the bottom of the corresponding shielding plate for pulling the shielding plate up and down.

[0009] Furthermore, an outer shell is fixedly connected to the outside of the tower body, and a motor is installed inside the outer shell. The output end of the motor is fixedly connected to a main shaft, and a half gear is fixedly connected to the main shaft. One end of each of the two sets of shafts is rotatably connected to the outer shell, and one end of each of the two sets of shafts is fixedly connected to a driven gear. The driven gears mesh with the half gears respectively to drive the two sets of shafts to rotate alternately.

[0010] Furthermore, a torsion spring is provided at one end of the shaft located inside the housing for resetting the shaft after rotation.

[0011] Furthermore, an abutment plate corresponding to the connecting rope is fixedly connected to the shaft, and one end of the connecting rope is fixed to the abutment plate.

[0012] Furthermore, each set of air distribution channels has multiple sets of drainage plates fixedly connected to its inner wall, and these drainage plates are spirally distributed along the circumference of the air distribution channel.

[0013] Furthermore, each set of gas transmission channels has an upper baffle corresponding to the lower baffle fixedly connected to its inner wall, and an elastic membrane is provided between the upper baffle and the corresponding lower baffle.

[0014] Furthermore, an air intake pipe is connected through the air intake hole, and a fan is connected to the other end of the air intake pipe. A pretreatment box is connected to the air intake end of the fan.

[0015] A PSA (Pressure Swing Adsorption) process for hydrogen production, using the aforementioned PSA adsorption tower, includes the following steps: Step 1: Gas is introduced into the tower body through the inlet at the bottom of the tower body; Step 2: An alternating mechanism controls two adjacent sets of shielding plates to alternately rise and fall along the axis of the gas delivery channel, causing the gas delivery channel to periodically form an airflow channel; Step 3: Gas enters the tower body through the gas delivery channel and the gas distribution channel, and is evenly distributed to the adsorption units; Step 4: Under adsorption pressure, impurities in the gas are adsorbed by the adsorption units, and hydrogen, as the product gas, flows out from the outlet at the top of the tower body.

[0016] The beneficial effects of this invention are as follows: 1. By setting up a distribution mechanism, the shielding plates inside the gas delivery channel can close or open the gas delivery channel. By controlling the alternating up and down movement of two adjacent sets of shielding plates along the axial direction of the gas delivery channel, the adjacent gas delivery channels are opened alternately, so that the gas is distributed in batches and evenly in the adsorption tower. This effectively avoids the generation of low-speed dead zones in the edge areas, so that the edge sites of the adsorbent can be fully utilized. At the same time, it alleviates the problem of concentrated adsorption load in the central area, and improves the contact area and uniformity between the adsorbent and the gas. This distribution mechanism helps to improve the purification efficiency of hydrogen and enhances the adsorption treatment capacity of pollutants in the gas.

[0017] 2. With the addition of an alternating mechanism, two sets of shafts rotate alternately under the drive of a motor, half gear, and driven gear. This controls the adjacent shielding plates to alternately rise and fall along the axis of the gas delivery channel. By using dynamic gas distribution, the gas is distributed in batches and evenly through the gas delivery channel into the gas distribution channel, effectively avoiding the problem of uneven airflow caused by concentrated gas influx. Compared with the traditional static gas distribution mode, the alternating mechanism can flexibly adjust the gas distribution state. Attached Figure Description

[0018] Figure 1 is a three-dimensional structural schematic diagram of the present invention; Figure 2 is a front view sectional view of the adsorption tower of the present invention; Figure 3 is a three-dimensional structural schematic diagram of the distribution mechanism of the present invention; Figure 4 is a three-dimensional sectional view of the distribution mechanism of the present invention; Figure 5 is a three-dimensional sectional view of the disc, base, shielding plate, lower baffle, upper baffle, and elastic membrane of the present invention; Figure 6 is a three-dimensional sectional view of the base, gas transmission channel, shielding plate, lower baffle, telescopic unit, and alternating mechanism of the present invention; Figure 7 is a three-dimensional sectional view of the disc, base, lower baffle, upper baffle, and elastic membrane of the present invention; Figure 8 is a three-dimensional structural schematic diagram of the disc, gas distribution channel, and guide plate of the present invention; Figure 9 is a three-dimensional structural schematic diagram of the distribution mechanism and alternating mechanism of the present invention; Figure 10 is a three-dimensional structural schematic diagram of the shielding plate and alternating mechanism of the present invention; Figure 11 is a three-dimensional structural schematic diagram of the shaft, motor, main shaft, half gear, driven gear, and torsion spring of the present invention; Figure 12 is a three-dimensional structural schematic diagram of the shaft, connecting rope, main shaft, half gear, and driven gear of the present invention.

[0019] In the diagram: 100, Adsorption tower; 101, Tower body; 102, Inlet; 103, Outlet; 104, Packing hole; 105, Adsorption unit; 106, Outer shell; 200, Distribution mechanism; 201, Disc; 202, Gas distribution channel; 2021, Guide plate; 203, Base; 204, Gas delivery channel; 205, Connecting channel; 206, Shielding plate; 207, Lower baffle; 208, Upper... 209. Stop bar; 300. Elastic membrane; 301. Telescopic unit; 302. Connecting rod; 403. Spring; 404. Alternating mechanism; 405. Shaft; 406. Abutment plate; 407. Connecting rope; 408. Connecting seat; 409. Motor; 400. Main shaft; 401. Half gear; 402. Driven gear; 403. Torsion spring; 500. Air intake pipe; 600. Fan; 700. Pretreatment box. Detailed Implementation

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0021] Referring to Figures 1-2, the present invention provides a PSA (Pressure Swing Adsorption) tower for hydrogen production, including an adsorption tower 100. The adsorption tower 100 includes a tower body 101, an air inlet 102 at the bottom of the tower body 101, an air outlet 103 at the top, a packing hole 104, and an adsorption unit 105 filled in the tower body 101. An air inlet pipe 500 is connected through the air inlet 102, and a blower 600 is connected to the other end of the air inlet pipe 500. The air inlet end of the blower 600 is connected to a pretreatment box 700.

[0022] Referring to Figures 2-7, the system also includes a distribution mechanism 200, which is disposed within the tower body 101 and located above the air inlet 102. The distribution mechanism 200 includes a disc 201 fixedly connected to the inner wall of the tower body 101, multiple sets of air distribution channels 202 formed within the disc 201, a base 203 fixedly connected to the bottom of the disc 201, and multiple sets of air delivery channels 204 formed within the base 203. The multiple sets of air distribution channels 202 are distributed in a ring with equal spacing outwards from the center of the disc 201. The air delivery channels 204 correspond one-to-one with the air distribution channels 202 and are interconnected, forming vertical channels. Adjacent sets of air delivery channels 204 are connected by a connecting channel 205. Each set of air supply channels 204 is equipped with a shielding plate 206, which is adapted to the cross-sectional shape of the air supply channel 204. Each set of air supply channels 204 has a lower baffle 207 fixedly connected to its inner sidewall. The lower baffle 207 is located above the connecting channel 205 and its function is to limit the position of the shielding plate 206. A telescopic unit 300 is provided between the shielding plate 206 and the corresponding lower baffle 207. In the initial state, the shielding plate 206 is located at the bottom of the lower baffle 207 and is higher than the connecting channel 205, and the air supply channel 204 is in a closed state. When air is supplied, the two adjacent sets of shielding plates 206 alternately rise and fall along the axis of the air supply channel 204 to form an airflow channel.

[0023] Referring to Figure 8, each set of air distribution channels 202 has multiple sets of guide vanes 2021 fixedly connected to its inner sidewall. The multiple sets of guide vanes 2021 are spirally distributed along the circumference of the air distribution channel 202. The spirally distributed multiple sets of guide vanes 2021 are used to guide the airflow to form a spiral flow and promote uniform gas distribution.

[0024] Referring to Figures 5 and 6, each set of gas delivery channels 204 has an upper baffle 208 fixedly connected to the inner wall of the upper baffle 208 corresponding to the lower baffle 207. An elastic membrane 209 is provided between the upper baffle 208 and the corresponding lower baffle 207. The elastic membrane 209 forms a deformable elastic chamber in the gas delivery channel 204. When the gas passes through the elastic chamber formed by the elastic membrane 209, the pressure fluctuation generated by the airflow will cause the elastic membrane 209 to vibrate at a high frequency and a small amplitude, thereby shaking off the impurity particles attached to the surface of the elastic membrane 209 and the inner wall of the gas delivery channel 204.

[0025] Specifically, referring to Figures 5-6, the telescopic unit 300 includes multiple sets of connecting rods 301 fixedly connected to the shielding plate 206. Each set of connecting rods 301 movably passes through the corresponding lower baffle 207. One end of the connecting rod 301 is fixedly connected to the upper surface of the shielding plate 206, and the other end movably passes through the lower baffle 207, thereby ensuring that the shielding plate 206 can only move up and down along the axial direction of the air supply channel 204. Each set of connecting rods 301 is provided with a spring 302. The two ends of the spring 302 are fixed to the upper surface of the lower baffle 207 and the connecting rod 301, respectively. The function of the spring 302 is to provide an upward preload in the initial state, so that the shielding plate 206 fits tightly against the lower baffle 207, thereby closing the air supply channel 204.

[0026] Furthermore, referring to Figures 3 and 9-10, an alternating mechanism 400 is provided inside the tower body 101. The alternating mechanism 400 is located below the shielding plate 206 and is used to drive adjacent shielding plates 206 to alternately rise and fall along the axis of the gas transmission channel 204 to achieve dynamic gas distribution. Specifically, the alternating mechanism 400 includes two sets of parallel shafts 401, both ends of which are rotatably connected to the tower body 101. Multiple sets of connecting ropes 402 are wound axially at equal intervals on each set of shafts 401, and the connecting ropes 402 on the two sets of shafts 401 are arranged in a staggered manner. The other end of the connecting rope 402 is fixedly connected to the connecting seat 403 at the bottom of the corresponding shielding plate 206. Specifically, the other end of the connecting rope 402 on one set of shafts 401 is fixedly connected to the bottom connecting seat 403 of the shielding plate 206 on the left side of the two adjacent sets of shielding plates 206. The connecting rope 402 on the other set of shafts 401 is connected to the bottom connecting seat 403 of the shielding plate 206 on the right side of the two adjacent sets of shielding plates 206. The connecting seat 403 is fixed to the bottom of the shielding plate 206 by welding or threaded connection to ensure uniform force distribution.

[0027] When the shaft 401 rotates, the connecting rope 402 wrapped around the shaft 401 gradually tightens, pulling the corresponding shielding plate 206 through the connecting seat 403, overcoming the preload of the spring 302, causing the shielding plate 206 to leave the lower baffle 207, opening the gas delivery channel 204. Through the alternating rotation of the two sets of shafts 401, the adjacent shielding plates 206 are raised and lowered alternately, thereby controlling the gas to enter the gas distribution channel 202 in batches and evenly through the gas delivery channel 204, effectively preventing the gas from concentrating in the central area of ​​the tower body 101, solving the problems of edge dead zone and central overload in traditional processes, and improving adsorption efficiency and product purity.

[0028] Referring to Figures 3, 10-11, a housing 106 is fixedly connected to the outside of the tower body 101. A motor 404 is installed inside the housing 106. A main shaft 405 is fixedly connected to the output end of the motor 404. A half gear 406 is fixedly connected to the main shaft 405. One end of each of the two sets of shafts 401 passes through the side wall of the tower body 101 and is rotatably connected to the housing 106. A driven gear 407 is fixedly connected to one end of each of the two sets of shafts 401. The driven gears 407 mesh with the half gears 406 respectively to drive the shafts 401 to rotate alternately.

[0029] It should be noted that a torsion spring 408 is provided at one end of the shaft 401 located inside the housing 106. The two ends of the torsion spring 408 are fixed to the driven gear 407 and the housing 106 respectively, and are used to reset the shaft 401 after rotation.

[0030] Referring to Figure 12, a contact plate 4011 corresponding to the connecting rope 402 is fixedly connected to the shaft 401. One end of the connecting rope 402 is fixed to the contact plate 4011. When the shaft 401 rotates, the contact plate 4011 can make the force on the connecting rope 402 more even.

[0031] This invention provides a working principle for a PSA (Pressure Swing Adsorption) tower used in hydrogen production: Gas first enters a pretreatment tank 700, where impurities, moisture, and other substances detrimental to the subsequent adsorption process are removed. Then, it is pressurized by a blower 600 and fed into the tower through an inlet 102 at the bottom of the tower body 101 via an inlet pipe 500. After entering the tower body 101, the gas reaches the distribution mechanism 200. At this time, a motor 404 starts, and its output drives the main shaft 405 to rotate, which in turn drives the half-gear 406 fixed on the main shaft 405 to rotate. The half-gear 406 alternately meshes with driven gears 407 fixed on two sets of shafts 401, causing the two sets of shafts 401 to rotate alternately. When the shafts 401 rotate, the connecting rope 402 wound around them tightens accordingly, passing through the connecting seat... 403 pulls the shielding plate 206. Under the tension of the connecting rope 402, the shielding plate 206 overcomes the preload of the spring 302 in the telescopic unit 300, disengages from the lower stop bar 207, and opens the gas delivery channel 204. Since the connecting ropes 402 on the two sets of shafts 401 are interlaced to connect adjacent shielding plates 206, the adjacent shielding plates 206 alternately rise and fall along the axis of the gas delivery channel 204. The gas passes through the opened gas delivery channel 204, is diverted by the connecting channel 205, and then enters each gas delivery channel 204 evenly. It then rises along the gas delivery channel 204 and enters the gas distribution channel 202 that is connected to it. The spiral guide plate 2021 on the inner side wall of the gas distribution channel 202 guides the airflow to form a spiral flow, which further promotes the uniform distribution of gas on the cross section of the tower body 101.

[0032] The uniformly distributed gas rises into the region filled with adsorption unit 105. During the PSA pressure swing adsorption process, under high pressure, the adsorbent in adsorption unit 105 has a strong adsorption capacity for impurities in the gas, such as CO2, CO, CH4, and N2. However, hydrogen, due to its small molecular weight and low polarity, is hardly adsorbed, thus achieving initial enrichment of hydrogen. As the adsorption process proceeds, the adsorbent gradually becomes saturated. At this point, the system enters the depressurization stage. The pressure reduction causes the adsorbed impurities to desorb and be released from the surface of the adsorbent, restoring the adsorbent's activity and preparing it for the next round of adsorption. The hydrogen purified by adsorption unit 105 continues to rise and is finally discharged from the outlet 103 at the top of the tower 101, completing the entire hydrogen production process.

[0033] This invention provides a PSA (Pressure Swing Adsorption) process for hydrogen production, employing a PSA adsorption tower, comprising the following steps: Step 1: Gas is fed into the tower body 101 through the inlet 102 at the bottom of the tower body 101; Step 2: An alternating mechanism 400 controls two adjacent sets of shielding plates 206 to alternately rise and fall along the axis of the gas delivery channel 204, causing the gas delivery channel 204 to periodically form an airflow channel; Step 3: Gas enters the tower body 101 through the gas delivery channel 204 and the gas distribution channel 202, and is evenly distributed to the adsorption unit 105; Step 4: Under adsorption pressure, impurities in the gas are adsorbed by the adsorption unit 105, and hydrogen, as the product gas, flows out from the outlet 103 at the top of the tower body 101.

[0034] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A PSA (Pressure Swing Adsorption) tower for hydrogen production, comprising: An adsorption tower (100) includes a tower body (101), an air inlet (102) at the bottom of the tower body (101), an air outlet (103) at the top, and a packing hole (104), as well as adsorption units (105) filled in the tower body (101). The tower body (100) is characterized by further including a distribution mechanism (200) disposed within the tower body (101) and above the air inlet (102). The distribution mechanism (200) includes a disc (201) fixedly connected to the inner wall of the tower body (101), multiple sets of gas distribution channels (202) opened within the disc (201), a base (203) fixedly connected to the bottom of the disc (201), and multiple sets of gas delivery channels (204) opened within the base (203). The multiple sets of gas distribution channels (202) are connected to the disc (201) via the disc (201). The air supply channels (204) are arranged in a ring with equal spacing from the center outward. The air supply channels (204) correspond to and are connected to the air distribution channels (202). Adjacent air supply channels (204) are connected by connecting channels (205). Each air supply channel (204) is provided with a shielding plate (206). The inner sidewall of each air supply channel (204) is fixedly connected with a lower baffle (207). A telescopic unit (300) is provided between the shielding plate (206) and the corresponding lower baffle (207). In the initial state, the shielding plate (206) is located at the bottom of the lower baffle (207) and higher than the connecting channel (205). The air supply channel (204) is in a closed state. When air is supplied, the adjacent shielding plates (206) alternately rise and fall along the axis of the air supply channel (204) to form an airflow channel.

2. The PSA pressure swing adsorption tower for hydrogen production according to claim 1, characterized in that, The telescopic unit (300) includes multiple sets of connecting rods (301) fixedly connected to the shielding plate (206). Each set of connecting rods (301) moves through the corresponding lower stop bar (207), and each set of connecting rods (301) is provided with a spring (302).

3. The PSA pressure swing adsorption tower for hydrogen production according to claim 1, characterized in that, An alternation mechanism (400) is provided inside the tower body (101). The alternation mechanism (400) is located below the shielding plate (206). The alternation mechanism (400) includes two sets of parallel shafts (401). Both ends of the shafts (401) are rotatably connected to the tower body (101). Each set of shafts (401) has multiple sets of connecting ropes (402) wound at equal intervals along the axial direction. The connecting ropes (402) on the two sets of shafts (401) are arranged in an alternating manner. The other end of the connecting rope (402) is fixedly connected to the connecting seat (403) at the bottom of the corresponding shielding plate (206) for pulling the shielding plate (206) to move up and down.

4. The PSA pressure swing adsorption tower for hydrogen production according to claim 3, characterized in that, The outer side of the tower body (101) is fixedly connected to a shell (106), and a motor (404) is installed inside the shell (106). The output end of the motor (404) is fixedly connected to a main shaft (405), and a half gear (406) is fixedly connected to the main shaft (405). One end of each of the two sets of shafts (401) is rotatably connected to the shell (106), and one end of each of the two sets of shafts (401) is fixedly connected to a driven gear (407). The driven gear (407) meshes with the half gear (406) respectively to drive the two sets of shafts (401) to rotate alternately.

5. The PSA pressure swing adsorption tower for hydrogen production according to claim 4, characterized in that, A torsion spring (408) is provided at one end of the shaft (401) inside the housing (106) for resetting after the shaft (401) rotates.

6. The PSA pressure swing adsorption tower for hydrogen production according to claim 3, characterized in that, The shaft (401) is fixedly connected to an abutment plate (4011) corresponding to the connecting rope (402), and one end of the connecting rope (402) is fixed on the abutment plate (4011).

7. The PSA pressure swing adsorption tower for hydrogen production according to claim 1, characterized in that, Each set of gas distribution channels (202) has multiple sets of drainage plates (2021) fixedly connected to its inner sidewall. The multiple sets of drainage plates (2021) are spirally distributed along the circumference of the gas distribution channel (202).

8. The PSA pressure swing adsorption tower for hydrogen production according to claim 1, characterized in that, Each gas delivery channel (204) has an upper baffle (208) fixedly connected to the inner wall of the lower baffle (207), and an elastic membrane (209) is provided between the upper baffle (208) and the corresponding lower baffle (207).

9. The PSA pressure swing adsorption tower for hydrogen production according to claim 1, characterized in that, An air inlet pipe (500) is connected through the air inlet (102), and a fan (600) is connected to the other end of the air inlet pipe (500). The air inlet end of the fan (600) is connected to a pretreatment box (700).

10. A PSA pressure swing adsorption process for hydrogen production, employing the PSA pressure swing adsorption tower as described in claim 4, characterized in that, Includes the following steps: Step 1: Gas is fed into the tower body (101) through the air inlet (102) at the bottom of the tower body (101); Step 2: The alternating mechanism (400) controls the two adjacent sets of shielding plates (206) to alternately rise and fall along the axis of the gas conveying channel (204), so that the gas conveying channel (204) periodically forms an airflow channel; Step 3: Gas enters the tower body (101) through the gas conveying channel (204) and the gas distribution channel (202), and is evenly distributed to the adsorption unit (105); Step 4: Under the adsorption pressure, impurities in the gas are adsorbed by the adsorption unit (105), and hydrogen gas flows out from the air outlet (103) at the top of the tower body (101) as the product gas.

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