Pressure swing adsorption device of hydrogen production system

Abstract

The invention discloses a pressure swing adsorption device of a hydrogen production system. The pressure swing adsorption device comprises a first adsorption tower, a second adsorption tower, a waste gas emission unit, a hydrogen input pipe, a hydrogen output pipe, a program control valve group and a PLC (Programmable Logic Controller) control system, according to the device, a plurality of adsorption layers are respectively arranged in the first adsorption tower and the second adsorption tower, and the pressure change of each adsorption tower in different adsorption and regeneration stages is controlled, so that the intelligent control of the pressure swing adsorption hydrogen production process is realized, and the first adsorption tower and the second adsorption tower alternately perform adsorption and regeneration; compared with the traditional two independent steps of deoxidation and drying, the method has the advantages that the influence on the purification effect of hydrogen due to flow connection is avoided, the hydrogen purification flow is efficiently integrated, and the purification effect and efficiency of hydrogen are improved; by controlling the opening and closing time and sequence of the program control valve group, when one adsorption tower performs adsorption operation, the other adsorption tower performs regeneration operation, so that the overall efficiency and yield of the system are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of hydrogen purification, and in particular is a pressure swing adsorption device for a hydrogen production system. Background Art

[0002] In the current development of the hydrogen energy industry, PEM water electrolysis has been widely used as an environmentally friendly and efficient way to produce hydrogen. However, the hydrogen produced during PEM water electrolysis usually contains trace amounts of oxygen and a small amount of water vapor. These impurities have an adverse effect on the purity and subsequent applications of hydrogen. In order to improve the purity of hydrogen and meet the needs of high-precision industrial applications, hydrogen must be purified.

[0003] In the related technology, the existing hydrogen purification technology mainly includes two steps: deoxygenation and drying. The deoxygenation process is usually achieved through a deoxygenation tower, using a catalyst to react trace oxygen in hydrogen with hydrogen to generate water vapor and remove it; while the drying process generally uses a pressure swing adsorption device to remove water from hydrogen using the adsorption characteristics of molecular sieves; however, deoxygenation and drying are usually two independent steps, which not only increases the complexity and cost of hydrogen purification, but may also affect the purification effect of hydrogen due to connection problems between processes.

[0004] Therefore, there is an urgent need for a pressure swing adsorption device for a hydrogen production system that can efficiently integrate deoxygenation and drying, simplify the complexity of purification operations, and improve the effect and efficiency of hydrogen purification. Summary of the invention

[0005] An object of the present invention is to provide a pressure swing adsorption device for a hydrogen production system to solve at least one aspect of the problems and defects raised in the above-mentioned background technology.

[0006] Specifically, the present invention discloses a pressure swing adsorption device for a hydrogen production system, comprising:

[0007] A first adsorption tower, a second adsorption tower, a waste gas emission unit, a hydrogen input pipe, a hydrogen output pipe, a program control valve group and a PLC control system;

[0008] A plurality of adsorption layers are respectively arranged in the first adsorption tower and the second adsorption tower;

[0009] The first adsorption tower is provided with a first pipeline at the bottom and a second pipeline at the top, and the second adsorption tower is provided with a third pipeline at the bottom and a fourth pipeline at the top;

[0010] The first pipeline is connected to the third pipeline and is respectively in communication with the hydrogen input pipe and one end of the exhaust gas emission unit;

[0011] The second pipeline is connected to the fourth pipeline and is communicated with the hydrogen output pipe and the other end of the exhaust gas discharge unit respectively.

[0012] The pressure swing adsorption device of the hydrogen production system according to the present invention has at least the following beneficial effects:

[0013] The pressure swing adsorption device of the hydrogen production system controls the opening and closing of the valve group through the PLC control system control program, automatically adjusts the working states of the first adsorption tower and the second adsorption tower according to the working conditions, and realizes intelligent control of the pressure swing adsorption hydrogen production process by arranging a plurality of adsorption layers in the first adsorption tower and the second adsorption tower respectively, and controlling the pressure changes of each adsorption tower in different adsorption and regeneration stages, so as to make the first adsorption tower and the second adsorption tower alternately adsorb and regenerate. Compared with the two independent steps of traditional deoxygenation and drying, the present invention avoids the influence of the hydrogen purification effect due to the connection of the process, efficiently integrates the hydrogen purification process, simplifies the operation complexity, and improves the hydrogen purification effect and efficiency;

[0014] The present invention utilizes multiple pipelines and controls the opening and closing time and sequence of the programmable valve group to make the adsorption and regeneration process of the adsorption device more efficient. While one adsorption tower is performing an adsorption operation, the other adsorption tower is performing a regeneration operation, thereby realizing continuous production and improving the overall efficiency and output of the system.

[0015] As a further solution of the present invention: the plurality of adsorption layers include a plurality of deoxidizer layers and a plurality of desiccant layers, the plurality of deoxidizer layers and the plurality of desiccant layers are alternately arranged, and the inlet and outlet ends of the first adsorption tower and the second adsorption tower are desiccant layers respectively.

[0016] Since the plurality of adsorption layers include a plurality of deoxidizer layers and a plurality of desiccant layers, the plurality of deoxidizer layers and the plurality of desiccant layers are alternately arranged, and the inlet and outlet ends of the first adsorption tower and the second adsorption tower are respectively the desiccant layers, the desiccant layers can effectively remove moisture from the hydrogen, and the deoxidizer layers convert trace amounts of oxygen and hydrogen in the hydrogen into water, which is then adsorbed by the desiccant layers; by alternately arranging the plurality of deoxidizer layers and the plurality of desiccant layers, it is ensured that in the process of hydrogen purification, oxygen and moisture in the hydrogen can be effectively removed, thereby improving the purity of the hydrogen.

[0017] As a further solution of the present invention: a fifth pipeline is provided at one end of the first pipeline, a sixth pipeline is provided at one end of the third pipeline, and the fifth pipeline is connected to the sixth pipeline.

[0018] As a further solution of the present invention: the first pipeline of the first adsorption tower and the third pipeline of the second adsorption tower are connected to the exhaust gas emission unit through a fifth pipeline and a sixth pipeline respectively.

[0019] Since a fifth pipeline is provided at one end of the first pipeline, and a sixth pipeline is provided at one end of the third pipeline, the fifth pipeline is connected to the sixth pipeline; the first pipeline of the first adsorption tower and the third pipeline of the second adsorption tower are connected to the exhaust gas emission unit through the fifth pipeline and the sixth pipeline respectively, so that the first adsorption tower and the second adsorption tower can perform exhaust gas emission operations separately or jointly, and can effectively adjust the exhaust gas treatment in different adsorption towers according to actual working conditions, thereby improving the operational flexibility and efficiency of the device.

[0020] As a further solution of the present invention: the program-controlled valve group includes a first intake valve arranged on the first pipeline and a second intake valve arranged on the third pipeline, and also includes a first exhaust valve arranged on the fifth pipeline and a second exhaust valve arranged on the sixth pipeline.

[0021] Since the program-controlled valve group includes a first intake valve arranged on the first pipeline and a second intake valve arranged on the third pipeline, and also includes a first exhaust valve arranged on the fifth pipeline and a second exhaust valve arranged on the sixth pipeline; the first adsorption tower and the second adsorption tower can be independently or jointly intake or exhaust according to working conditions, and the pressure changes of the first adsorption tower and the second adsorption tower in different adsorption and regeneration stages can be controlled respectively, ensuring the alternating adsorption and regeneration of the first adsorption tower and the second adsorption tower, thereby realizing efficient integration of the hydrogen purification process.

[0022] As a further solution of the present invention: an intake check valve is provided between the hydrogen input pipe and the first pipeline and the third pipeline, and an exhaust check valve is provided between the exhaust gas discharge unit and the fifth pipeline and the sixth pipeline.

[0023] Since an intake check valve is arranged between the hydrogen input pipe and the first pipeline and the third pipeline, the hydrogen in the first pipeline and the third pipeline can be effectively prevented from flowing back to the hydrogen input pipe, thereby avoiding equipment damage or system failure caused by the backflow of hydrogen; in addition, an exhaust check valve is arranged between the exhaust emission unit and the fifth pipeline and the sixth pipeline, which can effectively prevent the exhaust gas from the exhaust emission unit from flowing back to the fifth pipeline and the sixth pipeline, thereby improving the safety and stability of the system.

[0024] As a further solution of the present invention: a first one-way valve is provided on the second pipeline, a second one-way valve is provided on the fourth pipeline, a first pressure sensor is provided on one side of the second pipeline, and a second pressure sensor is provided on one side of the fourth pipeline.

[0025] By arranging a first one-way valve on the second pipeline and a second one-way valve on the fourth pipeline, the backflow of hydrogen or exhaust gas can be effectively prevented, and the pressure fluctuation in each adsorption tower caused by the backflow of gas can be avoided, resulting in reduced efficiency or equipment damage, thereby ensuring the stability and safety of the adsorption and regeneration process of the first adsorption tower and the second adsorption tower; and a first pressure sensor is arranged on one side of the second pipeline and a second pressure sensor is arranged on one side of the fourth pipeline, so that the pressure conditions of the second pipeline of the first adsorption tower and the fourth pipeline of the second adsorption tower can be monitored in real time, ensuring pressure control during exhaust gas emission or regeneration, avoiding overpressure or low-pressure operation of the system, and ensuring the purification effect and efficiency of hydrogen.

[0026] As a further solution of the present invention: a first branch pipe and a second branch pipe are arranged between the second pipeline and the fourth pipeline, a third branch pipe is arranged between the first branch pipe and the second branch pipe, a third one-way valve and a fourth one-way valve are arranged on the first branch pipe, a first pressure regulating valve is arranged on the third branch pipe, and a first vent valve is arranged between the second branch pipe and the exhaust gas emission unit.

[0027] Since a first branch pipe and a second branch pipe are arranged between the second pipeline and the fourth pipeline, a third branch pipe is arranged between the first branch pipe and the second branch pipe, a third one-way valve and a fourth one-way valve are arranged on the first branch pipe, a first pressure regulating valve is arranged on the third branch pipe, and a first vent valve is arranged between the second branch pipe and the exhaust gas emission unit, the third one-way valve and the fourth one-way valve on the first branch pipe can effectively prevent the exhaust gas discharged from the second adsorption tower from flowing back into the first adsorption tower; and the first pressure regulating valve on the third branch pipe can accurately control the flow and pressure of the gas to ensure that the system maintains the best operating state under different operating modes; at the same time, the first vent valve between the second branch pipe and the exhaust gas emission unit can quickly release excess gas to avoid damage to the system due to excessive pressure.

[0028] As a further solution of the present invention: the hydrogen output pipe is provided with a finished hydrogen output pipeline and a sampling branch along the hydrogen output direction, and the finished hydrogen output pipeline is provided with a back pressure valve, a first pressure reducing valve, a third pressure sensor, a first regulating valve, and a fifth one-way valve in sequence.

[0029] By arranging a finished hydrogen output pipeline and a sampling branch along the hydrogen output direction of the hydrogen output pipe, the finished hydrogen output pipeline is provided with a back pressure valve, a first pressure reducing valve, a third pressure sensor, a first regulating valve, and a fifth one-way valve in sequence. The pressure in the hydrogen output pipe can be monitored and adjusted in real time through the back pressure valve, the first pressure reducing valve, the third pressure sensor, and the first regulating valve to ensure that the pressure in the hydrogen output pipe is within a safe range and to prevent leakage or explosion risks caused by excessive pressure. The fifth one-way valve is used to prevent gas backflow and ensure that hydrogen is efficiently output to the hydrogen collection device, thereby improving the operational stability and reliability of the device for efficient hydrogen production.

[0030] As a further solution of the present invention: the sampling branch is provided with a second pressure reducing valve, a trace oxygen analyzer, a dew point meter, and a hydrogen analyzer in sequence.

[0031] Since the sampling branch is equipped with a second pressure reducing valve, a trace oxygen analyzer, a dew point meter, and a hydrogen analyzer in sequence, the hydrogen quality detection capability of the pressure swing adsorption hydrogen production system can be effectively improved, ensuring the high purity and low moisture content of the hydrogen, improving the integration capability and operating efficiency of the hydrogen purification process, and ensuring high-quality output of hydrogen.

[0032] As a further solution of the present invention: a second vent valve and a safety valve are arranged in parallel on the hydrogen inlet pipe.

[0033] Since the second vent valve and the safety valve are arranged in parallel on the hydrogen input pipe, multiple protection mechanisms are provided for the hydrogen purification process, so that during the gas transportation process, the hydrogen input pipe can release the excess gas in the hydrogen input pipe or the exhaust gas during the debugging stage through the second vent valve to prevent the gas transportation pressure from being too high and ensure that the gas pressure of the hydrogen input pipe is within a safe range; at the same time, the safety valve can automatically open when the system gas pressure exceeds the preset safety limit to quickly release the excess gas, prevent the system from leaking or exploding due to excessive gas pressure, and improve the safety and reliability of the operation process.

[0034] As a further solution of the present invention: a drain pipe is arranged at the bottom of the exhaust gas discharge unit, and a solenoid valve is arranged on the drain pipe.

[0035] Since a drain pipe is provided at the bottom of the exhaust gas emission unit and a solenoid valve is provided on the drain pipe, condensed water in the exhaust gas can be effectively discharged, water accumulation inside the exhaust gas emission unit can be avoided, and the operating stability and reliability of the exhaust gas emission unit can be ensured.

[0036] As a further solution of the present invention: the first pipeline, the second pipeline, the third pipeline and the fourth pipeline are respectively provided with filtering devices.

[0037] The filtering devices of the first pipeline and the third pipeline can filter out the micro-particle impurities carried in the hydrogen entering the first adsorption tower and the second adsorption tower, reduce the impurities blocking the microporous structure of the deoxidizer layer and the desiccant layer in the first adsorption tower and the second adsorption tower, ensure the air permeability of the deoxidizer layer and the desiccant layer, and improve the hydrogen purification effect; and the filtering devices arranged in the second pipeline and the fourth pipeline can filter out some of the micro-particle impurities brought in when the hydrogen enters, avoid the micro-particle impurities in the adsorption tower from being taken out, affect the purity of the hydrogen output to the hydrogen collection device, and further improve the purity of the hydrogen finally entering the hydrogen collection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0039] Figure 1 This is an operating principle diagram of a pressure swing adsorption device in a hydrogen production system.

[0040] Reference numerals:

[0041] 1. First adsorption tower; 11. First pipeline; 12. Second pipeline; 13. Fifth pipeline; 14. First air inlet valve; 15. First exhaust valve; 16. First non-return valve; 17. First pressure sensor; 2. Second adsorption tower; 21. Third pipeline; 22. Fourth pipeline; 23. Sixth pipeline; 24. Second air inlet valve; 25. Second exhaust valve; 26. Second non-return valve; 27. Second pressure sensor; 3. Waste gas emission unit; 31. Exhaust non-return valve; 32. Drain pipe; 33. Drain valve; 4. Hydrogen input pipe; 41, air intake non-return valve; 42, second vent valve; 43, safety valve; 5, hydrogen output pipe; 51, back pressure valve; 52, first pressure reducing valve; 53, third pressure sensor; 54, first regulating valve; 55, fifth non-return valve; 56, second pressure reducing valve; 57, trace oxygen analyzer; 58, dew point meter; 59, hydrogen analyzer; 6, first branch pipe; 61, third non-return valve; 62, fourth non-return valve; 7, second branch pipe; 71, first vent valve; 8, third branch pipe; 81, first pressure regulating valve; 9, filter device. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the technical solution of the present invention is further specifically described below by way of examples and in conjunction with the accompanying drawings. In the specification, the same or similar reference numerals indicate the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the overall inventive concept of the present invention and should not be construed as a limitation of the present invention.

[0043] In addition, in the detailed description below, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the disclosed embodiments. However, it is apparent that one or more embodiments may be implemented without these specific details. In other cases, known structures and devices are embodied in a schematic manner to simplify the accompanying drawings.

[0044] like Figure 1The embodiment of the present invention is shown, a pressure swing adsorption device of a hydrogen production system, comprising: a first adsorption tower 1, a second adsorption tower 2, a waste gas emission unit 3, a hydrogen input pipe 4, a hydrogen output pipe 5, a program-controlled valve group and a PLC control system; a plurality of adsorption layers are respectively arranged in the first adsorption tower 1 and the second adsorption tower 2; a first pipeline 11 is arranged at the bottom of the first adsorption tower 1, and a second pipeline 12 is arranged at the top; a third pipeline 21 is arranged at the bottom of the second adsorption tower 2, and a fourth pipeline 22 is arranged at the top; the first pipeline 11 is connected to the third pipeline 21, and is respectively communicated with one end of the hydrogen input pipe 4 and the waste gas emission unit 3; the second pipeline 12 is connected to the fourth pipeline 22, and is respectively communicated with the other end of the hydrogen output pipe 5 and the waste gas emission unit 3.

[0045] Specifically, the pressure swing adsorption device of the hydrogen production system controls the opening and closing of the valve group through the PLC control system control program, and automatically adjusts the working states of the first adsorption tower 1 and the second adsorption tower 2 according to the working conditions. By arranging a plurality of adsorption layers in the first adsorption tower 1 and the second adsorption tower 2, respectively, and controlling the pressure changes of each adsorption tower in different adsorption and regeneration stages, the intelligent control of the pressure swing adsorption hydrogen production process is realized, so that the first adsorption tower 1 and the second adsorption tower 2 are alternately adsorbed and regenerated. Compared with the two independent steps of traditional deoxygenation and drying, the present invention avoids the influence of the hydrogen purification effect due to the connection of the process, efficiently integrates the hydrogen purification process, simplifies the operation complexity, and improves the hydrogen purification effect and efficiency.

[0046] The present invention utilizes multiple pipelines and controls the opening and closing time and sequence of the programmable valve group to make the adsorption and regeneration process of the adsorption device more efficient. While one adsorption tower is performing an adsorption operation, the other adsorption tower is performing a regeneration operation, thereby realizing continuous production and improving the overall efficiency and output of the system.

[0047] Furthermore, the plurality of adsorption layers include a plurality of deoxidizer layers and a plurality of desiccant layers, the plurality of deoxidizer layers and the plurality of desiccant layers are alternately arranged, and the inlet and outlet ends of the first adsorption tower 1 and the second adsorption tower 2 are respectively the desiccant layers.

[0048] Specifically, since the plurality of adsorption layers include a plurality of deoxidizer layers and a plurality of desiccant layers, the plurality of deoxidizer layers and the plurality of desiccant layers are alternately arranged, and the inlet and outlet ends of the first adsorption tower 1 and the second adsorption tower 2 are respectively the desiccant layers, and the ratio of the desiccant: deoxidizer: desiccant alternately arranged is 4:2:4; the desiccant layer can effectively remove moisture from the hydrogen, and the deoxidizer layer converts trace oxygen and hydrogen in the hydrogen into water, which is then adsorbed by the desiccant layer; by alternately arranging the plurality of deoxidizer layers and the plurality of desiccant layers, it is ensured that during the hydrogen purification process, oxygen and moisture in the hydrogen can be effectively removed, thereby improving the purity of the hydrogen.

[0049] like Figure 1As shown, a fifth pipeline 13 is provided at one end of the first pipeline 11, a sixth pipeline 23 is provided at one end of the third pipeline 21, and the fifth pipeline 13 is connected to the sixth pipeline 23; the first pipeline 11 of the first adsorption tower 1 and the third pipeline 21 of the second adsorption tower 2 are connected to the exhaust gas emission unit 3 through the fifth pipeline 13 and the sixth pipeline 23 respectively.

[0050] Specifically, since the fifth pipeline 13 is provided at one end of the first pipeline 11, and the sixth pipeline 23 is provided at one end of the third pipeline 21, the fifth pipeline 13 is connected to the sixth pipeline 23; the first pipeline 11 of the first adsorption tower 1 and the third pipeline 21 of the second adsorption tower 2 are connected to the exhaust gas emission unit 3 through the fifth pipeline 13 and the sixth pipeline 23 respectively, so that the first adsorption tower 1 and the second adsorption tower 2 can perform exhaust gas emission operations individually or jointly, and can effectively adjust the exhaust gas treatment in different adsorption towers according to actual working conditions, thereby improving the operational flexibility and efficiency of the device.

[0051] Furthermore, if Figure 1 As shown, the program-controlled valve group includes a first intake valve 14 arranged on the first pipeline 11 and a second intake valve 24 arranged on the third pipeline 21 , and also includes a first exhaust valve 15 arranged on the fifth pipeline 13 and a second exhaust valve 25 arranged on the sixth pipeline 23 .

[0052] Specifically, since the program-controlled valve group includes a first air intake valve 14 arranged on the first pipeline 11 and a second air intake valve 24 arranged on the third pipeline 21, and also includes a first exhaust valve 15 arranged on the fifth pipeline 13 and a second exhaust valve 25 arranged on the sixth pipeline 23; the first adsorption tower 1 and the second adsorption tower 2 can be independently or jointly intake or exhaust according to working conditions, and the pressure changes of the first adsorption tower 1 and the second adsorption tower 2 in different adsorption and regeneration stages can be controlled respectively, ensuring the alternating adsorption and regeneration of the first adsorption tower 1 and the second adsorption tower 2, thereby realizing efficient integration of the hydrogen purification process.

[0053] Furthermore, an intake check valve 41 is provided between the hydrogen input pipe 4 and the first pipeline 11 and the third pipeline 21 , and an exhaust check valve 31 is provided between the exhaust gas discharge unit 3 and the fifth pipeline 13 and the sixth pipeline 23 .

[0054] Specifically, since an intake check valve 41 is provided between the hydrogen input pipe 4 and the first pipeline 11 and the third pipeline 21, the hydrogen in the first pipeline 11 and the third pipeline 21 can be effectively prevented from flowing back to the hydrogen input pipe 4, thereby avoiding equipment damage or system failure caused by the backflow of hydrogen; in addition, an exhaust check valve 31 is provided between the exhaust emission unit 3 and the fifth pipeline 13 and the sixth pipeline 23, thereby effectively preventing the exhaust gas from the exhaust emission unit 3 from flowing back to the fifth pipeline 13 and the sixth pipeline 23, thereby improving the safety and stability of the system.

[0055] According to an embodiment of the present invention, Figure 1 As shown, a first one-way valve 16 is provided on the second pipeline 12 , a second one-way valve 26 is provided on the fourth pipeline 22 , a first pressure sensor 17 is provided on one side of the second pipeline 12 , and a second pressure sensor 27 is provided on one side of the fourth pipeline 22 .

[0056] Specifically, by setting a first one-way valve 16 on the second pipeline 12 and a second one-way valve 26 on the fourth pipeline 22, the backflow of hydrogen or exhaust gas can be effectively prevented, and the pressure fluctuation in each adsorption tower caused by the backflow of gas can be avoided, resulting in reduced efficiency or equipment damage, thereby ensuring the stability and safety of the adsorption and regeneration process of the first adsorption tower 1 and the second adsorption tower 2; and a first pressure sensor 17 is set on one side of the second pipeline 12, and a second pressure sensor 27 is set on one side of the fourth pipeline 22, so that the pressure conditions of the second pipeline 12 of the first adsorption tower 1 and the fourth pipeline 22 of the second adsorption tower 2 can be monitored in real time, ensuring pressure control during exhaust gas emission or regeneration, avoiding overpressure or low-pressure operation of the system, and ensuring the purification effect and efficiency of hydrogen.

[0057] Furthermore, a first branch pipe 6 and a second branch pipe 7 are arranged between the second pipeline 12 and the fourth pipeline 22, a third branch pipe 8 is arranged between the first branch pipe 6 and the second branch pipe 7, a third one-way valve 61 and a fourth one-way valve 62 are arranged on the first branch pipe 6, a first pressure regulating valve 81 is arranged on the third branch pipe 8, and a first vent valve 71 is arranged between the second branch pipe 7 and the exhaust gas emission unit 3.

[0058] Specifically, since a first branch pipe 6 and a second branch pipe 7 are arranged between the second pipeline 12 and the fourth pipeline 22, a third branch pipe 8 is arranged between the first branch pipe 6 and the second branch pipe 7, a third one-way valve 61 and a fourth one-way valve 62 are arranged on the first branch pipe 6, a first pressure regulating valve 81 is arranged on the third branch pipe 8, and a first vent valve 71 is arranged between the second branch pipe 7 and the exhaust gas emission unit 3, the third one-way valve 61 and the fourth one-way valve 62 on the first branch pipe 6 can effectively prevent the exhaust gas discharged from the second adsorption tower 2 from flowing back into the first adsorption tower 1; and the first pressure regulating valve 81 on the third branch pipe 8 can accurately control the flow and pressure of the gas to ensure that the system maintains the best operating state under different operating modes; at the same time, the first vent valve 71 between the second branch pipe 7 and the exhaust gas emission unit 3 can quickly release excess gas to prevent the system from being damaged due to excessive pressure.

[0059] Furthermore, the hydrogen output pipe 5 is provided with a finished hydrogen output pipeline and a sampling branch along the hydrogen output direction, and the finished hydrogen output pipeline is provided with a back pressure valve 51, a first pressure reducing valve 52, a third pressure sensor 53, a first regulating valve 54, and a fifth one-way valve 55 in sequence.

[0060] Specifically, a finished hydrogen output pipeline and a sampling branch are arranged along the hydrogen output direction of the hydrogen output pipe 5, and the finished hydrogen output pipeline is provided with a back pressure valve 51, a first pressure reducing valve 52, a third pressure sensor 53, a first regulating valve 54, and a fifth one-way valve 55 in sequence. The back pressure valve 51, the first pressure reducing valve 52, the third pressure sensor 53 and the first regulating valve 54 can monitor and adjust the pressure in the hydrogen output pipe 5 in real time to ensure that the pressure in the hydrogen output pipe 5 is within a safe range and prevent leakage or explosion risks caused by excessive pressure; and the fifth one-way valve 55 is used to prevent gas backflow to ensure that hydrogen is efficiently output to the hydrogen collection device, thereby improving the operational stability and reliability of the device for efficient hydrogen production.

[0061] Furthermore, the sampling branch is provided with a second pressure reducing valve 56, a trace oxygen analyzer 57, a dew point meter 58, and a hydrogen analyzer 59 in sequence.

[0062] Specifically, since the sampling branch is provided with a second pressure reducing valve 56, a trace oxygen analyzer 57, a dew point meter 58, and a hydrogen analyzer 59 in sequence, the hydrogen quality detection capability of the pressure swing adsorption hydrogen production system can be effectively improved, ensuring the high purity and low moisture content of the hydrogen, improving the integration capability and operating efficiency of the hydrogen purification process, and ensuring high-quality output of hydrogen.

[0063] like Figure 1 As shown, a second vent valve 42 and a safety valve 43 are arranged in parallel on the hydrogen input pipe 4 .

[0064] Specifically, since the second vent valve 42 and the safety valve 43 are arranged in parallel on the hydrogen input pipe 4, multiple protection mechanisms are provided for the hydrogen purification process, so that during the gas transportation process, the hydrogen input pipe 4 can release excess gas in the hydrogen input pipe 4 or exhaust gas during the debugging stage through the second vent valve 42 to prevent the gas transportation pressure from being too high and ensure that the gas pressure of the hydrogen input pipe 4 is within a safe range; at the same time, the safety valve 43 can be automatically opened when the system gas pressure exceeds the preset safety limit, and the excess gas can be quickly released to prevent the system from leaking or exploding due to excessive gas pressure, thereby improving the safety and reliability of the operation process.

[0065] like Figure 1 As shown, a drain pipe 32 is provided at the bottom of the exhaust gas discharge unit 3 , and a drain valve 33 is provided on the drain pipe 32 .

[0066] Specifically, since a drain pipe 32 is provided at the bottom of the exhaust gas emission unit 3 and a drain valve 33 is provided on the drain pipe 32, condensed water in the exhaust gas can be effectively discharged to avoid water accumulation inside the exhaust gas emission unit 3, thereby ensuring the operating stability and reliability of the exhaust gas emission unit 3.

[0067] It should also be noted that the first pipeline 11 , the second pipeline 12 , the third pipeline 21 and the fourth pipeline 22 are respectively provided with a filtering device 9 .

[0068] Specifically, the filtering device 4 of the first pipeline 11 and the third pipeline 21 can filter out the micro-particle impurities carried in the hydrogen entering the first adsorption tower 1 and the second adsorption tower 2, reduce the impurities blocking the microporous structure of the deoxidizer layer and the desiccant layer in the first adsorption tower 1 and the second adsorption tower 2, ensure the air permeability of the deoxidizer layer and the desiccant layer, and improve the hydrogen purification effect; and the filtering device 4 arranged in the second pipeline 12 and the fourth pipeline 22 can filter out some of the micro-particle impurities brought in when the hydrogen enters, avoid the micro-particle impurities in the adsorption tower from being taken out, affect the purity of the hydrogen output to the hydrogen collection device, and further improve the purity of the hydrogen finally entering the hydrogen collection device.

[0069] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pressure swing adsorption device for a hydrogen production system, characterized in that: include: A first adsorption tower (1), a second adsorption tower (2), a waste gas discharge unit (3), a hydrogen input pipe (4), a hydrogen output pipe (5), a program-controlled valve group, and a PLC control system; A plurality of adsorption layers are respectively arranged in the first adsorption tower (1) and the second adsorption tower (2); The first adsorption tower (1) is provided with a first pipeline (11) at the bottom and a second pipeline (12) at the top, and the second adsorption tower (2) is provided with a third pipeline (21) at the bottom and a fourth pipeline (22) at the top; The first pipeline (11) is connected to the third pipeline (21), and is respectively in communication with the hydrogen input pipe (4) and one end of the exhaust gas discharge unit (3); The second pipeline (12) is connected to the fourth pipeline (22), and is respectively in communication with the hydrogen output pipe (5) and the other end of the exhaust gas discharge unit (3).

2. The pressure swing adsorption device of the hydrogen production system according to claim 1, characterized in that: The plurality of adsorption layers include a plurality of deoxidizer layers and a plurality of desiccant layers, the plurality of deoxidizer layers and the plurality of desiccant layers are arranged alternately, and the inlet and outlet ends of the first adsorption tower (1) and the second adsorption tower (2) are respectively the desiccant layers.

3. The pressure swing adsorption device of the hydrogen production system according to claim 2, characterized in that: A fifth pipeline (13) is provided at one end of the first pipeline (11), a sixth pipeline (23) is provided at one end of the third pipeline (21), and the fifth pipeline (13) is connected to the sixth pipeline (23).

4. The pressure swing adsorption device of the hydrogen production system according to claim 3, characterized in that: The first pipeline (11) of the first adsorption tower (1) and the third pipeline (21) of the second adsorption tower (2) are connected to the exhaust gas emission unit (3) through a fifth pipeline (13) and a sixth pipeline (23) respectively.

5. The pressure swing adsorption device of the hydrogen production system according to claim 4, characterized in that: The program-controlled valve group comprises a first intake valve (14) arranged on the first pipeline (11) and a second intake valve (24) arranged on the third pipeline (21), and also comprises a first exhaust valve (15) arranged on the fifth pipeline (13) and a second exhaust valve (25) arranged on the sixth pipeline (23).

6. The pressure swing adsorption device of the hydrogen production system according to claim 1, characterized in that: The second pipeline (12) is provided with a first one-way valve (16), the fourth pipeline (22) is provided with a second one-way valve (26), a first pressure sensor (17) is provided on one side of the second pipeline (12), and a second pressure sensor (27) is provided on one side of the fourth pipeline (22).

7. The pressure swing adsorption device of the hydrogen production system according to claim 6, characterized in that: A first branch pipe (6) and a second branch pipe (7) are arranged between the second pipeline (12) and the fourth pipeline (22); a third branch pipe (8) is arranged between the first branch pipe (6) and the second branch pipe (7); a third check valve (61) and a fourth check valve (62) are arranged on the first branch pipe (6); a first pressure regulating valve (81) is arranged on the third branch pipe (8); and a first vent valve (71) is arranged between the second branch pipe (7) and the exhaust gas discharge unit (3).

8. The pressure swing adsorption device of the hydrogen production system according to claim 7, characterized in that: The hydrogen output pipe (5) is provided with a finished hydrogen output pipeline and a sampling branch along the hydrogen output direction, and the finished hydrogen output pipeline is provided with a back pressure valve (51), a first pressure reducing valve (52), a third pressure sensor (53), a first regulating valve (54), and a fifth one-way valve (55) in sequence.

9. The pressure swing adsorption device of the hydrogen production system according to claim 8, characterized in that: The sampling branch is provided with a second pressure reducing valve (56), a trace oxygen analyzer (57), a dew point meter (58), and a hydrogen analyzer (59) in sequence.

10. The pressure swing adsorption device of the hydrogen production system according to claim 1, characterized in that: The hydrogen inlet pipe (4) is provided with a second vent valve (42) and a safety valve (43) in parallel.

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