Adsorption column for extracting high-purity nitrogen

Abstract

The utility model relates to a gas separation technical field, concretely relates to a kind of extraction high-purity nitrogen's adsorption tower, including pressure swing adsorption tower, interconnection pipe and gas storage pipe, pressure swing adsorption tower is two and top is interconnected with interconnection pipe, interconnection pipe between intercommunication is provided with gas storage pipe, interconnection pipe end intercommunication is provided with branch pipe, two pressure swing adsorption towers are communicated by branch pipe when pressure equalization, gas storage pipe both ends are provided with closed valve, adjacent closed valve is opened to make part high-pressure gas into gas storage pipe when pressure swing adsorption tower on high-pressure side pressure equalization, closed valve opening and closing can control internal high-pressure gas release, interconnection pipe middle part is provided with air valve to control pressure swing adsorption tower internal gas flow, the utility model, by the part high-pressure gas of conventional pressure equalization stage is stored, by secondary pressure equalization release stored, higher pressure gas, for compensating residual pressure difference, the use of initial high-pressure gas energy is realized, so that the device can effectively reduce the residual pressure difference of two sides pressure swing adsorption tower.

Description

Technical Field

[0001] This utility model relates to the field of gas separation technology, specifically to an adsorption tower for extracting high-purity nitrogen. Background Technology

[0002] Pressure swing adsorption (PSA) nitrogen generation is one of the mainstream methods for obtaining high-purity nitrogen in industry. Its core principle is to utilize the difference in adsorption rates of oxygen and nitrogen molecules by adsorbents such as carbon molecular sieves at room temperature. Through periodic pressure adsorption and depressurization desorption, high-purity nitrogen is separated from the air. A typical PSA nitrogen generation cycle includes steps such as adsorption, pressure equalization, desorption, and rinsing.

[0003] The efficiency of the pressure equalization step affects the final purity and yield of nitrogen. During nitrogen production, after adsorption tower A completes the adsorption step, the tower is in a high-pressure, nitrogen-rich state. Adsorption tower B should simultaneously complete the desorption step of the adsorbent, and the tower is in a low-pressure state. At this time, the two towers are connected, and the high-pressure nitrogen in tower A will flow to tower B, increasing the pressure of tower B and preparing for the next adsorption. At the same time, the remaining nitrogen in tower A can be discharged.

[0004] However, in existing pressure swing adsorption (PSA) nitrogen generation technology, after the main gas transfer is completed using the pressure equalization method, an unavoidable residual pressure difference still exists between the two towers. This residual pressure difference means that some of the high-pressure nitrogen that could have been used to increase the pressure in tower B is wasted, reducing energy efficiency.

[0005] To improve the overall performance of pressure swing adsorption (PSA) nitrogen production, several improvements have emerged in existing technologies. For example, Chinese utility model patent CN219848864U discloses a system for improving PSA product yield. This scheme adds a Venturi ejector, using the high-pressure desorption gas from the initial regeneration of one adsorption tank as a power source to extract residual gas from another tank. The core of this technology lies in optimizing the desorption process to ensure more thorough adsorbent regeneration, thereby increasing the adsorption capacity per cycle. However, it does not directly address the energy waste and purity fluctuations caused by residual pressure differences in the pressure equalization process; the efficiency issue of the pressure equalization process remains.

[0006] Therefore, in the field of pressure swing adsorption (PSA) nitrogen production, technicians urgently need a device that can significantly improve the pressure equalization effect, reduce the residual pressure difference between the two towers, and ensure that the initial conditions of each cycle are highly consistent, thereby improving energy utilization efficiency and gas production rate while ensuring the stability of nitrogen purity. Utility Model Content

[0007] The purpose of this invention is to provide an adsorption tower for extracting high-purity nitrogen in order to solve the above-mentioned problems. By storing a portion of the high-pressure gas in the conventional pressure equalization stage, and releasing the stored, higher-pressure gas through secondary pressure equalization to compensate for the residual pressure difference, the energy of the initial high-pressure gas is utilized. This allows the device to effectively reduce the residual pressure difference between the two pressure swing adsorption towers, as detailed below.

[0008] To achieve the above objectives, the present invention provides the following technical solution: This utility model provides an adsorption tower for extracting high-purity nitrogen, comprising a pressure swing adsorption tower, interconnecting pipes and a gas storage pipe. There are two pressure swing adsorption towers, each connected to an interconnecting pipe at its top, and a gas storage pipe is provided between the interconnecting pipes. The interconnecting pipe is connected to a branch pipe at its end. When the two pressure swing adsorption towers are equalized, they are connected through the branch pipe. Both ends of the gas storage pipe are equipped with a shut-off valve. When the pressure swing adsorption tower on the high-pressure side is equalized, the adjacent shut-off valve is opened to allow some high-pressure gas to enter the gas storage pipe. The opening and closing of the shut-off valve can control the release of internal high-pressure gas. A vent valve is provided in the middle of the interconnecting pipe to control the gas flow inside the pressure swing adsorption tower.

[0009] Using the aforementioned adsorption tower for extracting high-purity nitrogen, during the conventional pressure equalization stage, when one pressure swing adsorption tower completes the gas adsorption step and is in a high-pressure state while the other is in a low-pressure state, the vent valve in the middle of the interconnecting pipe between the two is opened, and connected through a branch pipe. This allows the high-pressure gas in the high-pressure side adsorption tower to flow directly into the low-pressure side adsorption tower through the interconnecting pipe and branch pipe for preliminary pressure equalization. Simultaneously, the shut-off valve of the adjacent gas storage pipe of the high-pressure side adsorption tower is opened. Utilizing the pressure difference between the high-pressure side and the gas storage pipe, a portion of the high-pressure gas enters the gas storage pipe during the pressure equalization process, thereby compressing the piston inside the gas storage pipe. This causes the piston to slide along the piston rod to the other end, compressing the gas on the other side of the piston. At this point, both sides of the piston in the gas storage pipe are under high-pressure gas. After the conventional pressure equalization is completed and the vent valve is closed... A residual pressure difference still exists between the two pressure swing adsorption towers. At this time, the shut-off valve of the gas storage pipe facing the low-pressure side is opened to release its internal pressure. At the same time, the adjacent vent valve is opened, and the compressed gas in the gas storage pipe expands rapidly, pushing the piston to move back quickly. This pushes out the high-pressure gas stored in the gas storage pipe and injects it back into the pressure swing adsorption tower on the lower pressure side through the connector and branch pipe, thereby pressurizing the tower a second time to reduce the residual pressure difference between the two sides and achieve a more thorough pressure equalization effect. In the next working cycle, when the high and low pressure states of the two pressure swing adsorption towers are switched, the above gas storage pipe pressure difference compensation process is repeated. By alternately filling and releasing the gas storage pipe, the pressure difference after each pressure equalization is reduced, thereby improving the efficiency of subsequent adsorption processes and nitrogen purity.

[0010] Preferably, each pressure swing adsorption tower has an interconnection port at the top, which is connected to an adjacent interconnecting pipe. A connector is provided between the interconnecting pipe and the gas storage pipe. The connector is a multi-port connector, and both sides of the connector are connected to branch pipes to bypass the gas storage pipe and connect to the interconnecting pipe.

[0011] Preferably, mounting seats are fixed at both ends of the inner wall of the gas storage pipe, and a piston rod is fixed between the mounting seats. A piston is slidably disposed in the middle of the piston rod and slidably seals with the inner wall of the gas storage pipe. After the high-pressure gas enters the gas storage pipe from one end, it squeezes the piston to move to the other end and compresses the gas on the other side of the piston. The gas shut-off valve opens to release the pressure inside the gas storage pipe and push the piston to quickly push out the gas in the gas storage pipe.

[0012] Preferably, the mounting base has a ventilation groove in the middle to allow gas to circulate.

[0013] Preferably, a pad is fixed to the end of the mounting base, and pads are fixed to both sides of the piston, so that the piston is cushioned by the pads when it is pushed by high-pressure gas.

[0014] Preferably, the pressure swing adsorption towers are fixed with a support frame, and the support frame has side support plates for connecting interconnecting pipes fixed on both sides, and a top plate for supporting the gas storage pipe is fixed in the middle of the support frame.

[0015] Preferably, a support is fixed to the top of the top plate, and a buckle plate is provided on the top of the support plate. Multiple arc-shaped grooves are opened on the opposite surfaces of the buckle plate and the support plate to adapt to the diameter of the gas storage pipe and the branch pipe.

[0016] Preferably, an exhaust rack is fixed to the top of the inner wall of the pressure swing adsorption tower, and a turbulence fan is rotatably installed on the side wall of the exhaust rack.

[0017] Preferably, each of the deflector fans has a hollow groove in the middle to reduce its weight, and each of the deflector fan sidewalls has a ventilation groove.

[0018] Preferably, the bottom of the pressure swing adsorption tower is fixed with multiple support pillars, and a through pipe is provided at the center of the bottom of the pressure swing adsorption tower to connect to external gas.

[0019] The beneficial effects are as follows: 1. By setting up a gas storage pipe with a piston, this utility model stores part of the high-pressure gas in the conventional pressure equalization stage instead of directly consuming it. The stored gas with higher pressure is released through secondary pressure equalization to compensate for the residual pressure difference, thereby realizing the utilization of the energy of the initial high-pressure gas and enabling the device to effectively reduce the residual pressure difference between the two pressure swing adsorption towers. 2. When the residual pressure difference is large, a secondary pressurization method of directional injection of high-pressure gas in the gas storage pipe is adopted; when the residual pressure difference is low, the method is switched to opening all valves to simultaneously equalize the pressure on both sides. Various pressure equalization methods can be selected according to the pressure difference, so that the device can perform pressure equalization work in various situations. 3. Core components such as gas storage pipe, gas shut-off valve, vent valve and branch pipe are symmetrically arranged. When the high and low pressure states of the two pressure swing adsorption towers are interchanged in the next working cycle, the same set of equipment can perform the same pressure equalization process in reverse without any modification. This avoids the need to configure a complex pressure equalization device for each tower, simplifies the equipment structure, and reduces the manufacturing cost and control complexity of the equipment. 4. During secondary pressure equalization, when the gas-closing valve on one side of the gas storage pipe opens to release pressure, the pressure on that side drops sharply, while the other side of the piston is still filled with high-pressure gas. The pressure difference between the two sides will drive the piston to move rapidly. The rapid movement of the piston actively pushes out the high-pressure gas that needs to be discharged on the other side and injects it into the low-pressure tower, rather than simply relying on the natural flow under the pressure difference. This piston-driven pressure equalization accelerates the gas transfer speed, thereby optimizing the efficiency of the secondary pressure equalization process. 5. The turbulence fan installed at the top of the tower passively rotates using the high-pressure airflow entering through the top interconnection. It can rotate without additional power to optimize the gas distribution in the low-pressure side of the pressure swing adsorption tower, thereby improving the utilization efficiency of the adsorbent. Attached Figure Description

[0020] 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.

[0021] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a partial structural schematic diagram of the present invention; Figure 3 This is a partial structural disassembly diagram of this utility model; Figure 4 This is a partial structural schematic diagram of the gas storage pipe of this utility model; Figure 5 This is a schematic diagram of the structure of the bracket of this utility model; Figure 6 This is a partial structural schematic diagram of the bracket of this utility model; Figure 7 This is a schematic diagram of the structure of the support of this utility model; Figure 8This is a structural breakdown diagram of the present invention; Figure 9 This is a schematic diagram of the structure of the exhaust bracket of this utility model; Figure 10 This is a schematic diagram of the structure of the turbulence fan of this utility model; Figure 11 This is a front view of the present invention.

[0022] The annotations in the attached figures are explained as follows: 1. Pressure Swing Adsorption Tower; 101. Support Column; 102. Through Pipe; 103. Interchange Port; 2. Interconnecting Pipe; 201. Branch Pipe; 202. Vent Valve; 203. Connector; 3. Gas Storage Pipe; 301. Air Shut-off Valve; 302. Mounting Base; 302a. Vent Slot; 303. Piston Rod; 304. Piston; 305. Pad Plate; 306. Pad Block; 4. Support Frame; 401. Side Support Plate; 402. Top Plate; 403. Support; 403a. Buckle Plate; 403b. Arc-shaped Slot; 5. Exhaust Frame; 501. Baffle Fan; 502. Ventilation Slot; 503. Hollow Slot. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] See Figures 1-11 As shown, this utility model provides an adsorption tower for extracting high-purity nitrogen, including a pressure swing adsorption tower 1, an interconnecting pipe 2, and a gas storage pipe 3. There are two pressure swing adsorption towers 1, and the tops of both are fixedly connected and connected to the interconnecting pipe 2. The gas storage pipe 3 is arranged horizontally between the interconnecting pipes 2. A branch pipe 201 is connected to the end of the interconnecting pipe 2 away from the pressure swing adsorption tower 1. When the two pressure swing adsorption towers 1 are equalizing pressure, they are connected to the interconnecting pipe 2 through the branch pipe 201 to equalize pressure. Both ends of the gas storage pipe 3 are equipped with shut-off valves 301 to allow some high-pressure gas to enter the gas storage pipe 3. When the high-pressure side pressure swing adsorption tower 1 is equalizing pressure, the adjacent shut-off valves 301 are opened to allow some high-pressure gas to enter the gas storage pipe 3. The opening and closing of the shut-off valves 301 can control the release of internal high-pressure gas. A vent valve 202 is provided in the middle of the interconnecting pipe 2 to control the gas flow inside the pressure swing adsorption tower 1.

[0025] When one of the pressure swing adsorption towers 1 completes the adsorption step and is in a high-pressure state, while the other pressure swing adsorption tower 1 is in a low-pressure state, first open the vent valve 202 in the middle of the interconnecting pipe 2 between the two pressure swing adsorption towers 1, and at the same time connect the two interconnecting pipes 2 through the branch pipe 201. At this time, the high-pressure gas in the high-pressure side pressure swing adsorption tower 1 flows directly into the low-pressure side pressure swing adsorption tower 1 through the interconnecting pipe 2 at its top and the branch pipe 201 to carry out preliminary pressure equalization work. At the same time, the shut-off valve 301 at one end of the gas storage pipe 3 adjacent to the high-pressure side pressure swing adsorption tower 1 is opened simultaneously. Utilizing the pressure difference between the high-pressure side pressure swing adsorption tower 1 and the gas storage pipe 3, a portion of the high-pressure gas enters the gas storage pipe 3 through the interconnecting pipe 2 during the pressure equalization process. When the normal pressure equalization is completed, the vent valve 202 in the middle of the two interconnecting pipes 2 is closed. At this time, the shut-off valve 301 at the end of the gas storage pipe 3 facing the low-pressure side pressure swing adsorption tower 1 is opened to release the pressure inside the gas storage pipe 3. At the same time, the vent valve 202 connected to the low-pressure side pressure swing adsorption tower 1 is opened. The high-pressure gas stored in the gas storage pipe 3 is then injected into the pressure swing adsorption tower 1 on the lower pressure side through the interconnecting pipe 2 and the branch pipe 201 to perform secondary pressurization on the tower to reduce the pressure difference between the two sides. When the normal pressure equalization ends, the residual pressure difference between the two pressure swing adsorption towers 1 is small, so all the vent valves 202 and the shut-off valves 301 can be opened. At this time, the gas storage pipe 3 is completely connected to the internal space of the two pressure swing adsorption towers 1. The high-pressure gas stored in the gas storage pipe 3, which comes from the initial high-pressure side pressure swing adsorption tower 1, flows to the top interconnection port 103 of the two pressure swing adsorption towers 1 because its own pressure is higher than the current pressure of the two pressure swing adsorption towers 1. The pressure equalization of the two pressure swing adsorption towers 1 is carried out from top to bottom.

[0026] As an optional implementation, each pressure swing adsorption tower 1 has an interconnection port 103 at its top, which is connected to the adjacent interconnecting pipe 2. A connector 203 for connecting the pipes is provided between the interconnecting pipe 2 and the gas storage pipe 3. The connector 203 is a multi-port connector 203, and both sides of the connector 203 are connected to the branch pipes 201 to bypass the gas storage pipe 3 and connect to the interconnecting pipe 2. With this configuration, when performing the initial pressure equalization work, the high-pressure gas in the high-pressure side pressure swing adsorption tower 1 flows out from its interconnection port 103, reaches the multi-port connector 203 through the interconnecting pipe 2, and directly flows through the branch pipes 201 on both sides of the connector 203, bypassing the gas storage pipe 3, and directly flows into the interconnecting pipe 2 of the low-pressure side pressure swing adsorption tower 1, and then enters its interior.

[0027] Mounting seats 302 are fixed at both ends of the inner wall of the gas storage pipe 3. A piston rod 303 is fixed between the mounting seats 302. A piston 304 is slidably mounted in the middle of the piston rod 303 and slides to seal against the inner wall of the gas storage pipe 3. After high-pressure gas enters the gas storage pipe 3 from one end, it squeezes the piston 304 to move to the other end and compresses the gas on the other side of the piston 304. The air-closing valve 301 opens to release the pressure inside the gas storage pipe 3 and allows the high-pressure gas to push the piston 304 to quickly push the gas out of the gas storage pipe 3. A venting groove 302a is provided in the middle of the mounting seat 302 to allow gas to flow. A pad 305 is fixed at the end of the mounting seat 302, and pads 306 are fixed on both sides of the piston 304. When the piston 304 is pushed by the high-pressure gas, it is buffered by the pads 306. With this configuration, when the high-pressure gas enters from one end of the gas storage pipe 3... When the gas shut-off valve 301 is activated, the gas first passes through the vent groove 302a in the middle of the mounting base 302, and then pushes the piston 304 to move to the other end of the gas storage pipe 3. During the movement of the piston 304, the gas on the other side of the piston 304 is compressed. When it is necessary to release the high-pressure gas in the gas storage pipe 3, the corresponding gas shut-off valve 301 is opened. High-pressure gas is stored on both sides of the piston 304. Due to the pressure difference, the high-pressure gas can push the piston 304 to move back quickly and push out the high-pressure gas on the other side to equalize the pressure, thereby increasing the pressure equalization speed. When the piston 304 moves to the end of its stroke, the pads 306 on both sides of the piston 304 contact the pads 305 at the corresponding ends. Through the buffering effect of the pads 306 and the pads 305, the direct impact of the piston 304 on the mounting base 302 is reduced.

[0028] A support frame 4 is fixed between the two pressure swing adsorption towers 1. Side support plates 401 connecting the interconnecting pipes 2 are fixed on both sides of the support frame 4. A top plate 402 supporting the gas storage pipe 3 is fixed in the middle of the support frame 4. A support 403 is fixed on the top of the top plate 402. A buckle plate 403a is provided on the top of the support 403. Multiple arc-shaped grooves 403b are formed on the opposite surfaces of the buckle plate 403a and the support 403 to accommodate the diameters of the gas storage pipe 3 and the branch pipes 201. With this arrangement, the two pressure swing adsorption towers 1 are fixed in relative position by the support frame 4. The side support plates 401 on both sides of the support frame 402... 1 provides an installation base for the interconnecting pipe 2. At the same time, the top plate 402 in the middle of the bracket 4 supports the bottom of the gas storage pipe 3. During installation, the gas storage pipe 3 is placed in the arc groove 403b of the support 403, and then the buckle plate 403a is fastened so that the arc groove 403b on the buckle plate 403a and the arc groove 403b on the support 403 together form a ring, thereby firmly fixing the gas storage pipe 3 to the top plate 402. Similarly, the branch pipe 201 can also be fixed by the buckle plate 403a and the corresponding arc groove 403b on the support 403.

[0029] Each pressure swing adsorption tower 1 has an exhaust rack 5 fixed to the top of its inner wall. Each exhaust rack 5 has a rotatable baffle 501 on its side wall. Each baffle 501 has a hollow slot 503 in the middle to reduce its weight, and each baffle 501 has a permeable slot 502 on its side wall. With this configuration, when the low-pressure side pressure swing adsorption tower 1 is equalizing pressure, the high-pressure gas flows in through the top interconnection 103. The airflow in the tower flows from bottom to top. When the airflow flows through the exhaust rack 5, it will push the rotatable baffle 501 on its side wall to rotate. During the rotation, the airflow passes through the permeable slot 502 on the side wall of the baffle 501, forming multiple fine airflows, thereby creating turbulence in the tower. This promotes the uniform distribution of nitrogen gas from the high-pressure side pressure swing adsorption tower 1 in the low-pressure side when equalizing pressure, avoiding dead air zones. At the same time, the hollow slot 503 in the middle of the baffle 501 reduces its overall weight and reduces the airflow speed required for its rotation.

[0030] Multiple support columns 101 are fixed at the bottom of the pressure swing adsorption tower 1, and a through pipe 102 is connected to the center of the bottom of the pressure swing adsorption tower 1 to connect to external gas. With this configuration, the multiple support columns 101 support the bottom of the pressure swing adsorption tower 1 to the ground, so that a certain space is formed between the bottom of the pressure swing adsorption tower 1 and the ground, which facilitates installation and maintenance. At the same time, the through pipe 102 located at the center of the bottom of the pressure swing adsorption tower 1 serves as a gas inlet and outlet channel, used to connect to the external raw material gas inlet pipe or finished nitrogen outlet pipe.

[0031] Using the above structure, during the conventional pressure equalization stage, when one of the pressure swing adsorption towers 1 completes the gas adsorption step and is in a high-pressure state, while the other is in a low-pressure state, the vent valve 202 in the middle of the interconnecting pipe 2 between the two is opened and connected through the branch pipe 201. This allows the high-pressure gas in the high-pressure side pressure swing adsorption tower 1 to flow directly into the low-pressure side pressure swing adsorption tower 1 through the interconnecting pipe 2 and the branch pipe 201 for preliminary pressure equalization. Simultaneously, the vent valve 301 of the adjacent gas storage pipe 3 of the high-pressure side pressure swing adsorption tower 1 is opened. Utilizing the pressure difference between the high-pressure side and the gas storage pipe 3, a portion of the high-pressure gas enters the gas storage pipe 3 during the pressure equalization process, thereby squeezing the piston 304 inside the gas storage pipe 3. This causes the piston 304 to slide along the piston rod 303 to the other end, compressing the gas on the other side of the piston 304. At this time, both sides of the piston 304 in the gas storage pipe 3 are under high pressure. When the conventional pressure equalization is completed and the vent valve 202 in the middle of the interconnecting pipe 2 is connected through the branch pipe 201, the high-pressure gas in the high-pressure side pressure swing adsorption tower 1 flows directly into the low-pressure side pressure swing adsorption tower 1 through the interconnecting pipe 2 and the branch pipe 201 for preliminary pressure equalization. After the gas valve 202 is closed, there is still a residual pressure difference between the two pressure swing adsorption towers 1. At this time, the gas storage pipe 3 is opened to the low-pressure side of the gas shut-off valve 301 to release the internal pressure. At the same time, the adjacent vent valve 202 is opened. The compressed gas in the gas storage pipe 3 expands rapidly, pushing the piston 304 to move back quickly, thereby quickly pushing out the high-pressure gas stored in the gas storage pipe 3. Through the connector 203 and the branch pipe 201, it is injected in the opposite direction into the pressure swing adsorption tower 1 on the lower pressure side, thereby pressurizing the tower a second time to reduce the residual pressure difference between the two sides and achieve a more thorough pressure equalization effect. In the next working cycle, when the high and low pressure states of the two pressure swing adsorption towers 1 are interchanged, the above process of compensating for the gas pressure difference in the gas storage pipe 3 is repeated. By alternating the filling and releasing of the gas storage pipe 3, the pressure difference after each pressure equalization is reduced, thereby improving the efficiency and nitrogen purity of the subsequent adsorption process. By setting up a gas storage pipe 3 with piston 304, a portion of the high-pressure gas in the conventional pressure equalization stage is stored instead of being directly consumed. The stored, higher-pressure gas is released through secondary pressure equalization to compensate for the residual pressure difference, thus realizing the utilization of the energy of the initial high-pressure gas. This allows the device to effectively reduce the residual pressure difference between the two pressure swing adsorption towers 1. When the residual pressure difference is large, a secondary pressurization method of directional injection of high-pressure gas is adopted in gas storage pipe 3; when the residual pressure difference is low, it switches to opening all valves to simultaneously equalize the pressure on both sides. Depending on the pressure difference, multiple pressure equalization methods can be selected, so that the device can perform pressure equalization work in various situations. The core components such as the gas storage pipe 3, the shut-off valve 301, the vent valve 202, and the branch pipe 201 are all symmetrically arranged. When the high and low pressure states of the two pressure swing adsorption towers 1 are exchanged in the next working cycle, the same set of equipment can perform the exact same pressure equalization process in reverse without any modification. This avoids configuring a complex pressure equalization device for each tower separately, simplifies the equipment structure, and reduces the manufacturing cost and control complexity of the device. During the secondary pressure equalization, when the gas-closing valve 301 on one side of the gas storage pipe 3 opens to release pressure, the pressure on that side drops sharply, while the other side of the piston 304 is still high-pressure gas. The pressure difference between the two sides will drive the piston 304 to move rapidly. The rapid movement of the piston 304 actively pushes out the high-pressure gas that needs to be discharged on the other side and injects it into the low-pressure tower, rather than simply relying on the natural flow under the pressure difference. This pressure equalization driven by the piston 304 accelerates the gas transfer speed, thereby optimizing the efficiency of the secondary pressure equalization process. The turbulence fan 501 installed at the top of the tower passively rotates using the high-pressure airflow entering through the top interconnection 103. It can rotate without additional power to optimize the gas distribution in the low-pressure side pressure swing adsorption tower 1, thereby improving the utilization efficiency of the adsorbent.

[0032] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. An adsorption tower for extracting high-purity nitrogen, characterized in that: It includes a pressure swing adsorption tower (1), an interconnecting pipe (2) and a gas storage pipe (3). There are two pressure swing adsorption towers (1) and the top of each tower is connected to an interconnecting pipe (2). A gas storage pipe (3) is connected between the interconnecting pipes (2). The interconnecting pipe (2) is connected to a branch pipe (201) at one end. When the two pressure swing adsorption towers (1) are equalized, they are connected through the branch pipe (201). Both ends of the gas storage pipe (3) are equipped with shut-off valves (301). When the pressure swing adsorption tower (1) on the high-pressure side is equalized, the adjacent shut-off valves (301) are opened to allow some high-pressure gas to enter the gas storage pipe (3). The opening and closing of the shut-off valves (301) can control the release of internal high-pressure gas. The interconnecting pipe (2) is equipped with a vent valve (202) in the middle to control the gas flow inside the pressure swing adsorption tower (1).

2. The adsorption tower for extracting high-purity nitrogen according to claim 1, characterized in that: The top of each pressure swing adsorption tower (1) is provided with an interconnection port (103), which is connected to the adjacent interconnection pipe (2). A connector (203) is provided between the interconnection pipe (2) and the gas storage pipe (3). The connector (203) is a multi-port connector (203), and the two sides of the connector (203) are connected to the branch pipe (201) to bypass the gas storage pipe (3) and connect to the interconnection pipe (2).

3. The adsorption tower for extracting high-purity nitrogen according to claim 1, characterized in that: The gas storage pipe (3) has mounting seats (302) fixed at both ends of its inner wall. A piston rod (303) is fixed between the mounting seats (302). A piston (304) is slidably disposed in the middle of the piston rod (303) and is slidably sealed to the inner wall of the gas storage pipe (3). After the high-pressure gas enters the gas storage pipe (3) from one end, it squeezes the piston (304) to move to the other end and compresses the gas on the other side of the piston (304). The gas shut-off valve (301) is opened to release the pressure inside the gas storage pipe (3) and push the piston (304) to quickly push the gas out of the gas storage pipe (3).

4. The adsorption tower for extracting high-purity nitrogen according to claim 3, characterized in that: The mounting base (302) has a ventilation groove (302a) in the middle to allow gas to circulate.

5. The adsorption tower for extracting high-purity nitrogen according to claim 3, characterized in that: The mounting base (302) is fixed with a pad (305) at its end, and the piston (304) is fixed with pads (306) on both sides. When the piston (304) is pushed by high-pressure gas, it is buffered by the pads (306).

6. The adsorption tower for extracting high-purity nitrogen according to claim 1, characterized in that: The pressure swing adsorption towers (1) are fixed with a support (4), and the support (4) has a side support plate (401) for connecting the interconnecting pipe (2) fixed on both sides. The support (4) has a top plate (402) for supporting the gas storage pipe (3) fixed in the middle.

7. The adsorption tower for extracting high-purity nitrogen according to claim 6, characterized in that: The top plate (402) is fixed with a support (403), and the support (403) is provided with a buckle plate (403a) on the top. The buckle plate (403a) and the support (403) are provided with multiple arc grooves (403b) on their opposite surfaces to accommodate the diameter of the gas storage pipe (3) and the branch pipe (201).

8. The adsorption tower for extracting high-purity nitrogen according to claim 1, characterized in that: The top of the inner wall of the pressure swing adsorption tower (1) is fixed with an exhaust rack (5), and the side wall of the exhaust rack (5) is rotatably equipped with a turbulence fan (501).

9. The adsorption tower for extracting high-purity nitrogen according to claim 8, characterized in that: The spoiler fan (501) has a hollow groove (503) in the middle to reduce its weight, and the spoiler fan (501) has a ventilation groove (502) on its side wall.

10. The adsorption tower for extracting high-purity nitrogen according to claim 1, characterized in that: The bottom of the pressure swing adsorption tower (1) is fixed with multiple support pillars (101), and a through pipe (102) is provided at the center of the bottom of the pressure swing adsorption tower (1) to connect to external gas.

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