Water electrolysis hydrogen production purification system

Abstract

The utility model discloses a water electrolysis hydrogen production purification system, and relates to the technical field of gas purification, the water electrolysis hydrogen production purification system has a first working mode, the water electrolysis hydrogen production purification system comprises a first adsorption tower group, a regeneration tower group and at least one second adsorption tower, the first adsorption tower group comprises at least two first adsorption towers which are connected in parallel, and the regeneration tower group comprises at least two second adsorption towers which are connected in parallel; the regeneration tower group comprises at least two regeneration towers, and the number of the regeneration towers corresponds to the number of the first adsorption towers; in the first working mode, the air inlet of the first adsorption tower is connected with an air source, the air inlets of the regeneration towers are communicated with the air outlet of the first adsorption tower, and the air outlets of at least two regeneration towers are communicated with the air inlet of one second adsorption tower. According to the technical scheme, the gas outlets of the at least two regeneration towers are communicated with the gas inlet of one second adsorption tower, so that the at least two regeneration towers can share one second adsorption tower, the number of at least one second adsorption tower is reduced, and the production cost of the device of the purification system is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of gas purification, and in particular to a water electrolysis hydrogen production and purification system. Background Art

[0002] The gas produced by water electrolysis to produce hydrogen contains target gas and a large amount of water vapor. In order to obtain high-purity target gas, the gas produced by water electrolysis to produce hydrogen needs to be purified.

[0003] In the existing water electrolysis hydrogen production and purification process, the adsorbent in the adsorption tower needs to be heated and regenerated, and the regenerated gas must pass through another adsorption tower for further purification. This results in a large number of equipment and high cost of hydrogen production equipment. Utility Model Content

[0004] The main purpose of this application is to propose a water electrolysis hydrogen production and purification system, aiming to reduce the cost of the equipment of the water electrolysis hydrogen production and purification system.

[0005] To achieve the above objectives, the water electrolysis hydrogen production and purification system proposed in the present application has a first operating mode, wherein the water electrolysis hydrogen production and purification system includes a first adsorption tower group, a regeneration tower group, and at least one second adsorption tower, wherein the first adsorption tower group includes at least two first adsorption towers, and the regeneration tower group includes at least two regeneration towers, and the number of the regeneration towers corresponds to the number of the first adsorption towers;

[0006] In the first working mode, the air inlet of the first adsorption tower is connected to the air source, the air inlet of the regeneration tower is connected to the air outlet of the first adsorption tower, and the air outlets of at least two regeneration towers are connected to the air inlet of one second adsorption tower.

[0007] In one embodiment, the water electrolysis hydrogen production and purification system further includes at least one cooler and at least one water-gas separator, the air inlet of one cooler is connected to the air outlet of at least two of the regeneration towers, and is connected to the air inlet of one of the second adsorption towers through one of the water-gas separators.

[0008] In one embodiment, at least two of the regeneration towers are connected in series to form a series tower group, the air inlet of the series tower group is connected to the air outlet of one of the first adsorption towers, and the air outlet of the series tower group is connected to the air inlet of one of the coolers.

[0009] In one embodiment, a heater is provided between the air inlet of the series tower group and the corresponding first adsorption tower.

[0010] In one embodiment, a heater is provided between the air inlet of the series tower group and the corresponding first adsorption tower, and in the corresponding series tower group, a heater is provided in the flow path between at least two adjacent regeneration towers.

[0011] In one embodiment, the water electrolysis hydrogen production and purification system has multiple purified gas outlets, and the water electrolysis hydrogen production and purification system further includes pressure regulating valves, the number of the pressure regulating valves corresponding to the number of the first adsorption towers is set, the gas inlets of the pressure regulating valves are connected to the gas outlets of the corresponding first adsorption towers, and the gas outlets of at least two of the pressure regulating valves are connected to different purified gas outlets;

[0012] For the first adsorption tower connected to the regeneration tower, the flow path between the first adsorption tower and the corresponding pressure regulating valve is connected in parallel to the flow path between the first adsorption tower and the corresponding regeneration tower.

[0013] In one embodiment, the water electrolysis hydrogen production and purification system has at least one purified gas outlet, and the water electrolysis hydrogen production and purification system also includes at least one pressure regulating valve. At least for one of the pressure regulating valves, its air inlet is connected to the air outlets of at least two of the first adsorption towers, and its air outlet is connected to one of the purified gas outlets.

[0014] In one embodiment, the water electrolysis hydrogen production and purification system further includes a flow regulating valve, the air inlet of the flow regulating valve is connected to the air outlet of the second adsorption tower, and the air outlet of the flow regulating valve and at least one of the pressure regulating valves are connected to the same purification outlet.

[0015] In one embodiment, the water electrolysis hydrogen production and purification system further includes a flow meter, which is provided on the flow path between the flow regulating valve and the second adsorption tower.

[0016] In one embodiment, the water electrolysis hydrogen production and purification system also has a second operating mode. In the second operating mode, the air inlet of one of the first adsorption towers is connected to the gas source, and the regeneration tower is connected to the air outlet of the first adsorption tower through its air inlet, and is connected to the air inlet of one of the second adsorption towers through its air outlet.

[0017] The technical solution of the present application is that in the first working mode, the air outlets of at least two regeneration towers are connected to the air inlet of a second adsorption tower, so that at least two regeneration towers can share one second adsorption tower, thereby saving the number of at least one second adsorption tower and reducing the production cost of the purification system device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0019] Figure 1 A water electrolysis hydrogen production and purification system according to an embodiment of the present application;

[0020] Figure 2 A water electrolysis hydrogen production and purification system according to another embodiment of the present application;

[0021] Figure 3 A water electrolysis hydrogen production and purification system according to another embodiment of the present application;

[0022] Figure 4 A water electrolysis hydrogen production and purification system according to another embodiment of the present application;

[0023] Figure 5 A water electrolysis hydrogen production and purification system according to another embodiment of the present application;

[0024] Figure 6 A water electrolysis hydrogen production and purification system according to another embodiment of the present application;

[0025] Figure 7 A water electrolysis hydrogen production and purification system according to another embodiment of the present application;

[0026] Figure 8 A water electrolysis hydrogen production and purification system according to another embodiment of the present application;

[0027] Figure 9 A water electrolysis hydrogen production and purification system according to another embodiment of the present application;

[0028] Figure 10 A water electrolysis hydrogen production and purification system according to another embodiment of the present application;

[0029] Figure 11 This is a water electrolysis hydrogen production and purification system according to another embodiment of the present application.

[0030] Description of Figure Numbers:

[0031] 10. Purification system; 100. First adsorption tower; 200. Second adsorption tower; 300. Regeneration tower; 400. Heater; 500. Cooler; 600. Water-gas separator; 700. Pressure regulating valve; 800. Flow regulating valve; 900. Flow meter; 110. First sub-tower; 120. Second sub-tower; 310. First regeneration tower; 310. Second regeneration tower; Q1. First on-off valve; Q2. Second on-off valve; Q3. Third on-off valve; Q4. Fourth on-off valve; Q5. Fifth on-off valve; Q6. Sixth on-off valve; Q7. Seventh on-off valve; Q8. Eighth on-off valve; Q9. Ninth on-off valve; Q 10 , the tenth switch valve.

[0032] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0034] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0035] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0036] The present application proposes a water electrolysis hydrogen production and purification system 10.

[0037] See also Figure 1 and Figure 4 In one embodiment of the present application, the water electrolysis hydrogen production and purification system 10 has a first working mode, and the water electrolysis hydrogen production and purification system 10 includes a first adsorption tower group, a regeneration tower group and at least one second adsorption tower 200. The first adsorption tower group includes at least two first adsorption towers 100, and the regeneration tower group includes at least two regeneration towers 300. The number of regeneration towers 300 is set corresponding to the number of first adsorption towers 100; in the first working mode, the air inlet of the first adsorption tower 100 is connected to the air source, the air inlet of the regeneration tower 300 is connected to the air outlet of the first adsorption tower 100, and the air outlets of at least two regeneration towers 300 are connected to the air inlet of one second adsorption tower 200.

[0038] Specifically, the water electrolysis hydrogen production and purification system 10 is mainly used to improve the purity of the gas generated by water electrolysis. The water electrolysis hydrogen production and purification system 10 can be applied to hydrogen purification and oxygen purification.

[0039] The air inlets of at least two first adsorption towers 100 are connected to the gas source. After the gas from the gas source enters the first adsorption tower 100, some impurities and moisture therein will be adsorbed by the adsorption material, thereby achieving gas purification. Part of the gas coming out of the gas outlet of the first adsorption tower 100 is heated at high temperature and then enters the regeneration tower 300 to regenerate the adsorption material in the regeneration tower 300 to restore its adsorption capacity. The gas outlets of at least two regeneration towers 300 are connected to the air inlet of the second adsorption tower 200 to purify the gas coming out of the gas outlet of the regeneration tower 300 again to ensure that the final gas meets the required high purity standard.

[0040] The water electrolysis hydrogen purification system 10 not only effectively improves the purity of the gas through the first adsorption tower 100, but also regularly regenerates the adsorption material through the regeneration tower 300, thereby extending the service life of the purification system 10 and reducing the cost of replacing the adsorption material, thereby improving the operating efficiency and economy of the purification system 10; the gas exiting the regeneration tower 300 is also re-adsorbed through the second adsorption tower 200, ensuring that the purification system 10 outputs high-quality product gas.

[0041] The gas inlet of the regeneration tower 300 can be connected to the gas outlets of different first adsorption towers 100. After being purified by the first adsorption tower 100, the qualified gas is discharged from the purification system 10, and the remaining portion enters the regeneration tower 300 as regeneration gas. The gas inlets of multiple regeneration towers 300 can also be connected in series or in parallel to the gas outlet of the same first adsorption tower 100. Part or all of the gas from the first adsorption tower 100 connected thereto enters the regeneration tower 300 as regeneration gas, and the remaining qualified gas from the first adsorption tower 100 is discharged from the purification system 10.

[0042] The gas outlets of at least two regeneration towers 300 are connected to the gas inlet of one second adsorption tower 200. Two of the multiple regeneration towers 300 may share one second adsorption tower 200; or every two of the multiple regeneration towers 300 may share one second adsorption tower 200; or multiple regeneration towers 300 may share one second adsorption tower 200. The multiple regeneration towers 300 that share the second adsorption tower 200 may be connected in parallel or in series.

[0043] The technical solution of the present application is that in the first working mode, the gas outlets of at least two regeneration towers 300 are connected to the gas inlet of a second adsorption tower 200, so that one second adsorption tower 200 can purify the regenerated gas coming out of at least two regeneration towers 300, that is, at least two regeneration towers 300 share one second adsorption tower 200, thereby saving the number of at least one second adsorption tower 200 and reducing the production cost of the device of the purification system 10.

[0044] In one embodiment, see Figure 5 The water electrolysis hydrogen production and purification system 10 also includes at least one cooler 500 and at least one water-gas separator 600. The air inlet of one cooler 500 is connected to the air outlet of at least two regeneration towers 300, and is connected to the air inlet of a second adsorption tower 200 through a water-gas separator 600.

[0045] The regenerated gas coming out of the regeneration tower 300 has a relatively high temperature. By arranging a cooler 500 on the flow path between the gas outlet of the regeneration tower 300 and the gas inlet of the second adsorption tower 200, the temperature of the high-temperature regenerated gas can be reduced to a suitable level to prevent the high temperature from damaging the adsorption material of the second adsorption tower 200, while also helping to improve the adsorption efficiency. The moisture separator 600 is used to remove moisture from the cooled gas to ensure that the gas entering the second adsorption tower 200 is drier, thereby improving the adsorption efficiency and the purity of the final product. The gas coming out of the gas outlet of the moisture separator 600 has a lower water content, which can reduce damage to the adsorption material in the second adsorption tower 200 and improve the adsorption efficiency of the second adsorption tower 200. The moisture separator 600 can be a gravity separator, a centrifugal separator, a metal wire, a metal mesh, etc.

[0046] By arranging at least one cooler 500 and at least one moisture separator 600 on the flow path between the gas outlets of at least two regeneration towers 300 and the gas inlet of the second adsorption tower 200, at least two regeneration towers 300 can share one cooler 500 and one moisture separator 600, thereby saving the number of at least one cooler 500 and at least one moisture separator 600, and further reducing the production cost of the device of the purification system 10.

[0047] In another embodiment, at least two regeneration towers 300 may share only the moisture separator 600. That is, the number of coolers 500 corresponds to the number of regeneration towers 300, and the air inlet of one moisture separator 600 is connected to the air outlets of at least two coolers 500 and to the air inlet of one second adsorption tower 200.

[0048] In other implementations, see Figure 4 One cooler 500 is connected to the gas outlet of one regeneration tower 300 and is connected to the gas inlet of the same second adsorption tower 200 through a moisture separator 600. Thus, at least two regeneration towers 300 share neither a cooler 500 nor a moisture separator 600, but only a second adsorption tower 200.

[0049] In one embodiment, see Figure 1 and Figure 6 At least two regeneration towers 300 are connected in series to form a series tower group, the air inlet of the series tower group is connected to the air outlet of a first adsorption tower 100, and the air outlet of the series tower group is connected to the air inlet of a cooler 500.

[0050] The series tower group consists of at least two regeneration towers 300 connected in series, with the outlet of the first adsorption tower 100 connected to the inlet of the series tower group. The gas exiting the first adsorption tower 100 is heated to high temperature and then enters the regeneration tower 300 at the upstream end of the series tower group. It then passes through the downstream regeneration towers 300 in sequence before passing through the outlet of the downstream regeneration tower 300 and into the cooler 500 and the water-gas separator 600. After cooling and preliminary drying, the gas then enters the second adsorption tower 200. By connecting at least two regeneration towers 300 in series to form a series tower group, the high-temperature waste heat from the upstream regeneration tower 300 can be used to heat the downstream regeneration tower 300, fully utilizing the high-temperature waste heat. This improves the energy load utilization rate of the purification system 10 and reduces the energy consumption of the purification system 10. The number and specifications of the regeneration towers 300 in the series tower group can be adjusted according to actual needs to flexibly meet different purification requirements.

[0051] In addition, the cooler 500 and the moisture separator 600 are arranged on the flow path between the air outlet of the series tower group and the air inlet of the second adsorption tower 200. The multiple regeneration towers 300 in the series tower group can share one cooler 500 and one moisture separator 600, thereby saving at least one cooler 500 and at least one moisture separator 600, further reducing the production cost of the device of the purification system 10.

[0052] In other embodiments, see Figure 4 and Figure 5The multiple regeneration towers 300 are not connected in series, but at least two regeneration towers 300 share one second adsorption tower 200. That is, the air inlet of each regeneration tower 300 is connected to the air outlet of the first adsorption tower 100, and the air outlets of at least two regeneration towers 300 are connected to the air inlet of the same second adsorption tower 200.

[0053] In one embodiment, see Figure 1 and Figure 7 A heater 400 is provided between the air inlet of the series tower group and the corresponding first adsorption tower 100.

[0054] The heater 400 is used to heat the gas in the flow path between the first adsorption tower 100 and the connected series of towers. This ensures that the gas entering the series of towers reaches a higher temperature, enabling the adsorption material in the regeneration tower 300 to be regenerated and its adsorption capacity to be restored. By positioning the heater 400 upstream of the gas inlet of the series of towers, the high-temperature regeneration gas entering the series of towers can regenerate not only the upstream-most regeneration tower 300 in the series of towers, but also the downstream regeneration towers 300. This fully utilizes the energy of the heater 400, improves the energy load utilization rate of the purification system 10, and reduces the energy consumption of the purification system 10.

[0055] In another embodiment, see Figure 2 and Figure 8 A heater 400 is provided between the air inlet of the series tower group and the corresponding first adsorption tower 100 , and in the corresponding series tower group, a heater 400 is provided in the flow path between at least two adjacent regeneration towers 300 .

[0056] In this embodiment, the purification system 10 is equipped not only with a heater 400 upstream of the gas inlet of the series-connected tower group, but also with a heater 400 in the flow path between at least two adjacent regeneration towers 300. By utilizing the high-temperature waste heat from the upstream regeneration tower 300 to heat the downstream regeneration tower 300, the regeneration gas maintains a stable temperature during transmission between each regeneration tower 300. This maintains the optimal operating temperature while flowing through each regeneration tower 300, preventing temperature drops that could reduce regeneration efficiency and thus ensuring efficient regeneration. Furthermore, maintaining temperature stability contributes to the stable operation of the series-connected tower group and reduces malfunctions. The number of heaters 400 in the series-connected tower group can be flexibly adjusted based on the number and specifications of the regeneration towers 300. A heater 400 can be provided in the flow path between two regeneration towers 300, for example, between the upstreammost regeneration tower 300 and its adjacent regeneration tower 300, or between the downstreammost regeneration tower 300 and its adjacent regeneration tower 300. Alternatively, a heater 400 can be provided in the flow path between every two regeneration towers 300. I will not list them one by one here.

[0057] In one embodiment, see Figure 1 and Figure 9 The water electrolysis hydrogen production and purification system 10 has multiple purified gas outlets, and the water electrolysis hydrogen production and purification system 10 also includes pressure regulating valves 700. The number of pressure regulating valves 700 corresponds to the number of first adsorption towers 100. The air inlet of the pressure regulating valve 700 is connected to the air outlet of the corresponding first adsorption tower 100, and the air outlets of at least two pressure regulating valves 700 are connected to different purified gas outlets; for the first adsorption tower 100 connected to the regeneration tower 300, the flow path between it and the corresponding pressure regulating valve 700 is connected in parallel with the flow path between it and the corresponding regeneration tower 300.

[0058] The gas outlet of each first adsorption tower 100 is connected to a corresponding pressure regulating valve 700, which is used to regulate the pressure of the gas coming out of the corresponding first adsorption tower 100 to ensure that the gas is in an optimal pressure state and a stable state when entering the subsequent processing unit, thereby ensuring the stability and efficiency of the purification system 10.

[0059] The gas outlets of at least two pressure regulating valves 700 are connected to different purification gas outlets, which can provide more flexible gas distribution and control, allowing some gas to be directly discharged from the purification system 10 as needed for different applications. It can also ensure that the purification system 10 can operate stably under different operating conditions, avoiding problems caused by pressure fluctuations or flow rate changes. The gas outlets of each pressure regulating valve 700 can be connected to a purification gas outlet in a one-to-one correspondence; the gas outlets of two pressure regulating valves 700 can be connected to different purification gas outlets, and the gas outlets of the remaining pressure regulating valves 700 can be connected to the same purification gas outlet. Alternatively, there can be two purification gas outlets, with at least one pressure regulating valve 700's gas outlet connected to one purification gas outlet and at least one pressure regulating valve 700's gas outlet connected to the other purification gas outlet.

[0060] For the first adsorption tower 100 connected to the regeneration tower 300, the flow path between it and the corresponding pressure regulating valve 700 is connected in parallel with the flow path between it and the corresponding regeneration tower 300. After pressure regulation, the gas can choose to directly enter the regeneration tower 300 for further purification, or be directly guided out of the purification system 10 from the purification outlet through the pressure regulating valve 700, thereby improving the operational flexibility of the system.

[0061] In one embodiment, see Figure 1 and Figure 10The water electrolysis hydrogen production and purification system 10 has at least one purified gas outlet, and the water electrolysis hydrogen production and purification system 10 also includes at least one pressure regulating valve 700. At least for one pressure regulating valve 700, its air inlet is connected to the air outlets of at least two first adsorption towers 100, and its air outlet is connected to one purified gas outlet.

[0062] The gas inlet of at least one pressure regulating valve 700 is connected to the gas outlets of at least two first adsorption towers 100, so that the gas outlets of the at least two first adsorption towers 100 can be combined and pressure-regulated by the same pressure regulating valve 700. The at least two first adsorption towers 100 can share a single pressure regulating valve 700, thereby eliminating the need for at least one pressure regulating valve 700 and further reducing the production cost of the purification system 10.

[0063] In one embodiment, see Figure 1 and Figure 10 The water electrolysis hydrogen production and purification system 10 further includes a flow regulating valve 800, the air inlet of the flow regulating valve 800 is connected to the air outlet of the second adsorption tower 200, and the air outlet of the flow regulating valve 800 and at least one pressure regulating valve 700 are connected to the same purification outlet.

[0064] When multiple pressure regulating valves 700 are connected to different purified gas outlets, the outlet of flow regulating valve 800 is connected to one of the purified gas outlets. When multiple pressure regulating valves 700 are connected to one purified gas outlet, the outlet of flow regulating valve 800 is connected to the purified gas outlet.

[0065] The flow regulating valve 800 is used to adjust the flow of the gas coming out of the gas outlet of the second adsorption tower 200, ensuring that the gas is in an optimal flow state when entering the purification gas outlet, so that the pressure of the gas entering the purification gas outlet from the second adsorption tower 200 is basically the same as the pressure of the gas entering the purification gas outlet from the first adsorption tower 100, thereby ensuring that the pressure of the gas discharged from the same purification gas outlet remains stable.

[0066] In one embodiment, see Figure 1 and Figure 10 The water electrolysis hydrogen production and purification system 10 further includes a flow meter 900 , which is disposed on the flow path between the flow regulating valve 800 and the second adsorption tower 200 .

[0067] By placing a flow meter 900 in the flow path between the flow control valve 800 and the second adsorption tower 200, the monitoring capability and control accuracy of the purification system 10 can be further improved. The flow meter 900 can monitor the flow rate of gas exiting the second adsorption tower 200 in real time, providing accurate flow data. This real-time flow data can be used to adjust the flow control valve 800 to ensure that gas enters the purified gas outlet at an optimal flow rate, helping operators to promptly understand the operating status of the purification system 10.

[0068] In one embodiment, see Figure 11 The water electrolysis hydrogen production and purification system also has a second working mode. In the second working mode, the air inlet of a first adsorption tower 100 is connected to the gas source, and a regeneration tower 300 is connected to the air outlet of the first adsorption tower 100 through its air inlet, and is connected to the air inlet of a second adsorption tower 200 through its air outlet.

[0069] Figure 11 The first adsorption tower 100, the regeneration tower 300 and the second adsorption tower 200 passed by the middle dotted line are not working, only the air inlet of the first adsorption tower 100 is connected to the air source, and a first adsorption tower 100, a regeneration tower 300 and a second adsorption tower 200 are connected in sequence.

[0070] When the gas flow rate of the gas source is small, the raw gas enters the purification system only from the air inlet of the first adsorption tower 100, and a part of the gas coming out of the air outlet of the first adsorption tower 100 is directly discharged from the purification system 10; the other part enters the regeneration tower 300 after being heated at high temperature to regenerate the regeneration tower 300, and the gas coming out of the air outlet of the regeneration tower 300 enters the second adsorption tower 200 for re-adsorption and then is discharged from the purification system 10.

[0071] In the second working mode, even if the gas flow rate of the gas source is small, the purification system 10 can still operate to purify the raw gas and regenerate the regeneration tower 200, thereby reducing the lower limit load of the purification operation, which is beneficial to improving the working range of the purification system 10 to better match the hydrogen production from renewable energy.

[0072] In one embodiment, see Figure 1The water electrolysis hydrogen purification system 10 has two purified gas outlets, one of which is a first gas outlet and the other is a second gas outlet. The water electrolysis hydrogen purification system 10 includes two first adsorption towers 100, two regeneration towers 300, and a second adsorption tower 200. One of the two first adsorption towers 100 is a first sub-tower 110, and the other is a second sub-tower 120. One of the two regeneration towers 300 is a first regeneration tower 310, and the other is a second regeneration tower 310. The first sub-tower 110 and the first regeneration tower 310 are both connected to the gas source and the first gas outlet, and a heater 400 is provided between the first sub-tower 110 and the first regeneration tower 310. The second sub-tower 120, the second regeneration tower 310, and the second adsorption tower 200 are all connected to the gas source, the second gas outlet, the gas inlet of the cooler 500, and the gas outlet of the water-gas separator 600.

[0073] The first sub-tower 110 and the first regeneration tower 310 can be switched between adsorption and regeneration cycles. Specifically, the first sub-tower 110 and the first regeneration tower 310 can be switched between, with the first sub-tower 110 being switched to the regeneration tower 300, and the first regeneration tower 310 being switched to the adsorption tower. The second sub-tower 120, the second regeneration tower 310, and the second adsorption tower 200 can be switched between adsorption, regeneration, and secondary adsorption cycles. Specifically, the second sub-tower 120, the second regeneration tower 310, and the second adsorption tower 200 can be switched between, with the second sub-tower 120 being switched to the regeneration tower 300 or the secondary adsorption tower, the second regeneration tower 310 being switched to the adsorption tower or the secondary adsorption tower, and the second adsorption tower 200 being switched to the adsorption tower or the regeneration tower 300. In this way, the first sub-tower 110, the first regeneration tower 310, the second sub-tower 120, the second regeneration tower 310, and the second adsorption tower 200 can all be regenerated, extending the service life of the purification device while not affecting the purification process of the purification system 10.

[0074] For ease of understanding, the following description uses the first sub-tower 110 and the second sub-tower 120 as adsorption towers, the first regeneration tower 310 and the second regeneration tower 310 as regeneration towers, and the second adsorption tower 200 as a secondary adsorption tower as an example. On-off valves are arranged on each flow path to control the flow path. Among them, the air inlet of the first sub-tower 110 is provided with a first on-off valve Q1, and the air outlet of the first sub-tower 110 is provided with a first on-off valve Q2; the air inlet of the first regeneration tower 310 is provided with a third on-off valve Q3, and the air outlet of the first regeneration tower 310 is provided with a first on-off valve Q4; the air inlet of the second regeneration tower 310 is provided with a fifth on-off valve Q5, and the air outlet of the second regeneration tower 310 is provided with a sixth on-off valve Q6; the air inlet of the second adsorption tower 200 is provided with a seventh on-off valve Q7, and the air outlet of the second adsorption tower 200 is provided with an eighth on-off valve Q8; the air inlet of the second sub-tower 120 is provided with a ninth on-off valve Q9, and the air outlet of the second sub-tower 120 is provided with a tenth on-off valve Q 10 In this embodiment, the first switch valve Q1, the second switch valve Q2, the third switch valve Q3, the fourth switch valve Q4, the fifth switch valve Q5, the sixth switch valve Q6, the seventh switch valve Q7, the eighth switch valve Q8, the ninth switch valve Q9 and the tenth switch valve Q 10 The other switch valves in the figure are in the closed state.

[0075] A portion of the raw gas from the gas source enters the second sub-tower 120 from the ninth switch valve Q9, and the qualified gas obtained after adsorption treatment enters the second sub-tower 120 from the tenth switch valve Q 10 The other part of the raw gas enters the first sub-tower 110 from the first switch valve Q1 for adsorption, passes through the bed from top to bottom, and the qualified gas obtained leaves the first sub-tower 110 from the second switch valve Q2. A part of the qualified gas is discharged from the first gas outlet through the pressure regulating valve 700; the other part of the qualified gas enters the heater 400 as the regeneration gas for heating and temperature increase. The high-temperature regeneration gas flows into the first regeneration tower 310 from the third switch valve Q3, heats the inside of the bed of the first regeneration tower 310, and then leaves the first regeneration tower 310 from the fourth switch valve Q4. The regenerated gas enters the regeneration tower 310 from the fifth switch valve Q5 for regeneration heating, leaves the second regeneration tower 310 from the sixth switch valve Q6, passes through the cooler 500 and the water-gas separator 600 in sequence, enters the second adsorption tower 200 from the seventh switch valve Q7 for re-adsorption, and leaves the second adsorption tower 200 from the eighth switch valve Q8. The regenerated gas is regulated by the flow meter 900 and the flow regulating valve 800, and is combined with the qualified gas coming out of the pressure regulating valve 700, and finally leaves the purification system 10 from the second gas outlet.

[0076] At this point, one cycle is completed. You can switch to another cycle and close the first switch valve Q1 to the tenth switch valve Q 10, and open the switch valve corresponding to the new cycle. The running flow path can refer to Figure 1 , I will not go into details here.

[0077] Furthermore, the parallel connection of the first purification unit group, formed by the first sub-tower 110 and the first regeneration tower 310, and the second purification unit group, formed by the second sub-tower 120, the second regeneration tower 310, and the second adsorption tower 200, further reduces the lower limit load of purification operation, thereby increasing the operating range of the purification units and better accommodating renewable energy hydrogen production. Understandably, when the gas source flow rate is low, the feed gas enters the purification system only from the first sub-tower 110, while still enabling regeneration of the first and second regeneration towers 310, thereby meeting the low-load operation requirements of the purification system.

[0078] In another embodiment, see Figure 2 A heater 400 is further provided on the flow path between the first regeneration tower 310 and the second regeneration tower 310 .

[0079] A portion of the raw gas from the gas source enters the second sub-tower 120 and undergoes adsorption treatment to obtain qualified gas, which passes through the pressure regulating valve 700 and is discharged from the second gas outlet. Another part of the raw gas enters the first sub-tower 110 for adsorption, passes through the bed from top to bottom, and obtains qualified gas. After coming out of the gas outlet of the first sub-tower 110, part of the qualified gas is discharged from the first gas outlet through the pressure regulating valve 700; another part of the qualified gas enters the heater 400 as regeneration gas for heating and temperature increase. The high-temperature regeneration gas flows into the first regeneration tower 310 and heats the inside of the bed of the first regeneration tower 310. Then, it leaves the first regeneration tower 310 and enters the heater 400 on the flow path between the first regeneration tower 310 and the second regeneration tower 310 for further heating and temperature increase. After that, the high-temperature regeneration gas enters the second regeneration tower 310 for regeneration heating, and then passes through the cooler 500 and the water-gas separator 600 in sequence and enters the second adsorption tower 200 for further adsorption. The regeneration gas coming out of the second adsorption tower 200 is regulated by the flow meter 900 and the flow regulating valve 800, and then merges with the qualified gas coming out of the pressure regulating valve 700, and finally leaves the purification system 10 from the second gas outlet.

[0080] In another embodiment, see Figure 3 The water electrolysis hydrogen production purification system 10 has a purified gas outlet, which is the second gas outlet. Qualified gases from the first sub-tower 110 and the second sub-tower 120 are discharged from the second gas outlet and share a pressure regulating valve 700.

[0081] A portion of the raw gas from the gas source enters the second sub-tower 120 and undergoes adsorption treatment to obtain qualified gas, which is then discharged from the second gas outlet after passing through the pressure regulating valve 700. Another portion of the raw gas enters the first sub-tower 110 for adsorption, passes through the bed from top to bottom, and obtains qualified gas. After exiting the gas outlet of the first sub-tower 110, a portion of the qualified gas is combined with the qualified gas from the second sub-tower 120 and is discharged from the second gas outlet through the pressure regulating valve 700; another portion of the qualified gas enters the heater 400 as regeneration gas for heating and temperature increase. The high-temperature regeneration gas flows into the first regeneration tower 310 and heats the interior of the bed of the first regeneration tower 310 before leaving the first regeneration tower 310. , and enters the heater 400 on the flow path between the first regeneration tower 310 and the second regeneration tower 310 for reheating and heating. After that, the high-temperature regenerated gas enters the second regeneration tower 310 for regeneration heating, and then passes through the cooler 500 and the water-gas separator 600 in sequence and enters the second adsorption tower 200 for re-adsorption. The regenerated gas coming out of the second adsorption tower 200 is regulated by the flow meter 900 and the flow regulating valve 800, and then merged with the qualified gas coming out of the pressure regulating valve 700, and finally leaves the purification system 10 from the second gas outlet.

[0082] The above description is merely an exemplary embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structural transformation made using the contents of the present application specification and drawings under the technical concept of the present application, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present application.

Claims

1. A water electrolysis hydrogen production and purification system, characterized in that: The water electrolysis hydrogen production and purification system has a first operating mode, and includes a first adsorption tower group, a regeneration tower group, and at least one second adsorption tower. The first adsorption tower group includes at least two first adsorption towers, and the regeneration tower group includes at least two regeneration towers. The number of the regeneration towers corresponds to the number of the first adsorption towers. In the first working mode, the air inlet of the first adsorption tower is connected to the air source, the air inlet of the regeneration tower is connected to the air outlet of the first adsorption tower, and the air outlets of at least two regeneration towers are connected to the air inlet of one second adsorption tower.

2. The water electrolysis hydrogen production and purification system according to claim 1, characterized in that: The water electrolysis hydrogen production and purification system also includes at least one cooler and at least one water-gas separator. The air inlet of one cooler is connected to the air outlets of at least two regeneration towers, and is connected to the air inlet of one second adsorption tower through one water-gas separator.

3. The water electrolysis hydrogen production and purification system according to claim 2, characterized in that: At least two of the regeneration towers are connected in series to form a series tower group, the air inlet of the series tower group is connected to the air outlet of one of the first adsorption towers, and the air outlet of the series tower group is connected to the air inlet of one of the coolers.

4. The water electrolysis hydrogen production and purification system according to claim 3, characterized in that: A heater is provided between the air inlet of the series tower group and the corresponding first adsorption tower.

5. The water electrolysis hydrogen purification system according to claim 3, characterized in that: A heater is provided between the air inlet of the series tower group and the corresponding first adsorption tower, and in the corresponding series tower group, a heater is provided in the flow path between at least two adjacent regeneration towers.

6. The water electrolysis hydrogen purification system according to claim 1, characterized in that: The water electrolysis hydrogen production and purification system has multiple purified gas outlets, and the water electrolysis hydrogen production and purification system also includes pressure regulating valves, the number of the pressure regulating valves corresponding to the number of the first adsorption towers is set, the air inlets of the pressure regulating valves are connected to the corresponding air outlets of the first adsorption towers, and the air outlets of at least two of the pressure regulating valves are connected to different purified gas outlets; For the first adsorption tower connected to the regeneration tower, the flow path between the first adsorption tower and the corresponding pressure regulating valve is connected in parallel to the flow path between the first adsorption tower and the corresponding regeneration tower.

7. The water electrolysis hydrogen production and purification system according to claim 1, characterized in that: The water electrolysis hydrogen production and purification system has at least one purified gas outlet, and the water electrolysis hydrogen production and purification system also includes at least one pressure regulating valve. At least for one of the pressure regulating valves, its air inlet is connected to the air outlets of at least two of the first adsorption towers, and its air outlet is connected to one of the purified gas outlets.

8. The water electrolysis hydrogen production and purification system according to claim 6 or 7, characterized in that: The water electrolysis hydrogen production and purification system further includes a flow regulating valve, the air inlet of the flow regulating valve is connected to the air outlet of the second adsorption tower, and the air outlet of the flow regulating valve and at least one of the pressure regulating valves are connected to the same purification outlet.

9. The water electrolysis hydrogen production and purification system according to claim 8, characterized in that: The water electrolysis hydrogen production and purification system further includes a flow meter, which is arranged on the flow path between the flow regulating valve and the second adsorption tower.

10. The water electrolysis hydrogen production and purification system according to claim 1, characterized in that: The water electrolysis hydrogen production and purification system also has a second operating mode. In the second operating mode, the air inlet of one of the first adsorption towers is connected to the gas source, and the regeneration tower is connected to the air outlet of the first adsorption tower through its air inlet, and is connected to the air inlet of one of the second adsorption towers through its air outlet.

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