Hydrogen recovery system

Abstract

The utility model discloses a hydrogen recovery system, which belongs to the technical field of electrolyzed water, and comprises a variable-pressure drying component, a hydrogen production system, a hydrogen production system, a hydrogen storage system, a hydrogen storage system, a hydrogen storage system and a water storage system, and is characterized in that the variable-pressure drying component comprises two drying towers which are connected with each other, and an inlet of one drying tower is a hydrogen inlet and an outlet of the drying tower is a dry gas outlet; the hydrogen inlet is connected with a gas outlet end of the hydrogen production system; an outlet of the other drying tower is a regenerated gas outlet; the first buffer tank is connected with the dry gas outlet; the ejector is provided with a first ejection inlet, a second ejection inlet and a mixed outlet, the first ejection inlet is connected with the first buffer tank, the second ejection inlet is connected with the regenerated gas outlet, the mixed outlet is connected with the hydrogen inlet, and the first control valve is used for controlling connection and disconnection of the first ejection inlet and the first buffer tank; recovery of hydrogen for regeneration is facilitated, and recovery energy consumption and cost are low.

Description

Technical Field

[0001] The utility model relates to the technical field of electrolyzed water, and particularly relates to a hydrogen recovery system. Background Art

[0002] The hydrogen produced by an electrolytic cell hydrogen production system needs to be subjected to deoxidation and drying treatment to purify the hydrogen, and then the purified hydrogen is stored. For a pressure swing adsorption drying device, generally two drying towers are provided. When one drying tower is used to dry hydrogen, a small amount of dry hydrogen needs to be introduced into the other drying tower that has adsorbed a large amount of moisture to carry out the moisture in the drying tower, so that the drying tower is regenerated. Since the drying tower in the regeneration state needs to be in a lower pressure environment to carry out a large amount of moisture, the hydrogen used for regeneration will generally be discharged into the atmosphere after passing through the drying tower in the regeneration state, resulting in waste of some hydrogen.

[0003] In the related art, some devices will use a hydrogen compressor to recover the hydrogen used for regeneration, but there are defects of high energy consumption, and the hydrogen with a large amount of moisture is easy to damage the impeller of the hydrogen compressor. Summary of the Utility Model

[0004] The utility model aims to at least solve one of the technical problems existing in the prior art. For this reason, the utility model provides a hydrogen recovery system, which is beneficial to realizing the recovery of the hydrogen used for regeneration, and has low recovery energy consumption and cost.

[0005] According to the hydrogen recovery system of the embodiment of the utility model, it is used to recover the hydrogen generated by a hydrogen production system. The hydrogen recovery system includes: a pressure swing drying component, including two drying towers connected to each other. The inlet of one drying tower is a hydrogen inlet and the outlet is a dry gas outlet. The hydrogen inlet is connected to the gas outlet end of the hydrogen production system. The outlet of the other drying tower is a regeneration gas outlet; a first buffer tank, connected to the dry gas outlet; an ejector, having a first ejector inlet, a second ejector inlet and a mixing outlet. The first ejector inlet is connected to the first buffer tank, the second ejector inlet is connected to the regeneration gas outlet, and the mixing outlet is connected to the hydrogen inlet; a first control valve, used to control the on-off of the first ejector inlet and the first buffer tank.

[0006] According to the hydrogen recovery system of the embodiments of the present utility model, it has at least the following beneficial effects: The hydrogen recovery system includes a pressure swing drying assembly. The pressure swing drying assembly includes two drying towers connected in communication. When the inlet of one of the drying towers is the hydrogen inlet and the outlet is the dry gas outlet, the hydrogen inlet is connected to the gas outlet end of the hydrogen production system. That is, the hydrogen produced by the hydrogen production system passes through the hydrogen inlet and enters the drying tower. Under the drying effect of the drying tower, the drying treatment of hydrogen is achieved. The dry gas outlet is connected to the first buffer tank, and the two drying towers are connected. Most of the dried hydrogen passes through the dry gas outlet and enters the first buffer tank. As the air pressure in the first buffer tank gradually increases, high-pressure hydrogen is obtained. A small part of the dried hydrogen enters another drying tower to carry out the moisture in the other drying tower, so that the drying tower is regenerated. The hydrogen carrying a large amount of moisture is discharged from the regeneration gas outlet. Since the first ejector inlet is connected to the first buffer tank and the first control valve is used to control the on-off of the first ejector inlet and the first buffer tank, when the first control valve is opened, part of the high-pressure hydrogen can pass through the first ejector inlet and enter the ejector. Through the jet of the high-pressure hydrogen, a negative pressure is generated at the second ejector inlet. The second ejector inlet is connected to the regeneration gas outlet, so that the hydrogen for regeneration passes through the second ejector inlet and enters the ejector, that is, the ejection of the hydrogen for regeneration is realized, so that the high-pressure hydrogen and the hydrogen for regeneration are mixed in the ejector. Since the mixing outlet is connected to the hydrogen inlet, the mixed hydrogen is passed into the pressure swing drying assembly again. That is, the hydrogen recovery system can not only realize the recovery of the hydrogen produced by the hydrogen production system, but also realize the recovery of the hydrogen for regeneration. And through the ejection method of the ejector, the energy consumption and cost of recovering the hydrogen for regeneration are relatively low. Compared with the method of directly compressing the hydrogen for regeneration by a hydrogen compressor, it is beneficial to avoid the problem that the hydrogen carrying a large amount of moisture damages the impeller of the hydrogen compressor. The hydrogen recovery system controls the pressure through the first buffer tank, so that the pressure of the high-pressure hydrogen is maintained within a preset range. The high-pressure hydrogen is used as the working fluid to realize the ejection of the hydrogen for regeneration, and the ejection effect is better. And the ejector operates only under a single load condition to ensure the stable operation of the ejector, so that the drying tower into which the dried hydrogen is introduced is regenerated within a preset time.

[0007] According to some embodiments of the present utility model, the present utility model further includes a compressor. The intake end of the compressor is connected to the dry gas outlet, and the outlet end of the compressor is connected to the first buffer tank.

[0008] The hydrogen recovery system further includes a compressor, and the compressor is arranged between the dry gas outlet and the first buffer tank. When the compressor operates, it can play a pressurizing role, that is, increase the pressure of the hydrogen flowing into the first buffer tank, so that high-pressure hydrogen is formed in the first buffer tank. The operation of the compressor is convenient for the subsequent storage of hydrogen.

[0009] According to some embodiments of the present utility model, the present utility model further includes a second buffer tank, and the second buffer tank is connected between the dry gas outlet and the intake end of the compressor.

[0010] The hydrogen recovery system further includes a second buffer tank, and the second buffer tank is connected between the dry gas outlet and the intake end of the compressor, that is, the dry hydrogen gas after drying treatment first enters the second buffer tank, and then enters the compressor, which is beneficial to making the gas pressure flowing into the compressor more stable, beneficial to making the load of the compressor more stable, beneficial to improving the service life of the compressor, and reducing the risk of compressor damage.

[0011] According to some embodiments of the present utility model, the present utility model further includes a third buffer tank and a second control valve. The third buffer tank is connected between the regeneration gas outlet and the second injection inlet, and the second control valve is used to control the on-off between the third buffer tank and the second injection inlet.

[0012] Specifically, the hydrogen recovery system further includes a third buffer tank and a second control valve. The third buffer tank is connected between the regeneration gas outlet and the second injection inlet, that is, the hydrogen gas flowing out of the regeneration gas outlet first enters the third buffer tank, and the third buffer tank is used to temporarily store the regenerated hydrogen gas. The second control valve is used to control the on-off between the third buffer tank and the second injection inlet. When the second control valve is opened, under the injection action of the ejector, the wet hydrogen gas in the third buffer tank can enter the ejector to realize the mixing of the hydrogen gas for regeneration and the high-pressure hydrogen gas. The mixed gas then enters the pressure swing drying assembly from the mixing outlet to realize the recovery of the hydrogen gas for regeneration.

[0013] According to some embodiments of the present utility model, the pressure swing drying assembly further includes two switching valves, and the two switching valves are respectively connected to the two drying towers. The switching valves are used to switch the two drying towers to the drying state and the regeneration state respectively. The drying state is that the inlet of the drying tower is the hydrogen inlet and the outlet is the dry gas outlet, and the regeneration state is that the outlet of the drying tower is the regeneration gas outlet.

[0014] Specifically, the pressure swing drying assembly further includes two switching valves, and the two switching valves are respectively connected to the two drying towers. With the cooperation of the two switching valves, the two drying towers are alternately switched between the drying state and the regeneration state. The drying state is that the inlet of the drying tower is the hydrogen inlet and the outlet is the dry gas outlet, that is, the hydrogen gas generated by the hydrogen production system can enter the drying tower in the drying state to realize the drying treatment of the generated hydrogen gas. Most of the dried hydrogen gas is led to the first buffer tank through the dry gas outlet to obtain high-pressure hydrogen gas. The regeneration state is that the outlet of the drying tower is the regeneration gas outlet. A small part of the dried hydrogen gas enters the drying tower in the regeneration state to carry out the moisture in the drying tower in the regeneration state.

[0015] According to some embodiments of the present utility model, the switching valve is a three-way valve, the three-way valve has a first port, a second port and a third port, the first port is connected to the gas outlet end of the hydrogen production system, the second port is connected to the second ejector inlet, and the third port is connected to the drying tower.

[0016] Specifically, the switching valve is a three-way valve, the first port is connected to the gas outlet end of the hydrogen production system, the second port is connected to the second ejector inlet, and the third port is connected to the drying tower. Through the control of the three-way valve, when the first port is communicated with the gas outlet end of the hydrogen production system, the second port is closed, and the third port is communicated with the drying tower, so that the corresponding drying tower is switched to the drying state; when the first port is disconnected from the gas outlet end of the hydrogen production system, the second port is opened, and the third port is communicated with the drying tower, so that the corresponding drying tower is switched to the regeneration state. A part of the hydrogen flowing out of the drying tower in the drying state can be conducted into the drying tower in the regeneration state, and the moisture in the drying tower in the regeneration state is carried out by the hydrogen. The hydrogen carrying a large amount of moisture is introduced into the third port from the regeneration gas outlet and conducted to the second ejector inlet from the second port to realize the recovery of the hydrogen for regeneration.

[0017] According to some embodiments of the present utility model, the present utility model further includes a pressure regulating valve, and both drying towers are connected to the pressure regulating valve, and the pressure regulating valve is used to adjust the gas pressure of one drying tower distributed to the other drying tower.

[0018] Specifically, the hydrogen recovery system further includes a pressure regulating valve, and both drying towers are connected to the pressure regulating valve, that is, the two drying towers are communicated through the pressure regulating valve. Under the regulating action of the pressure regulating valve, the gas pressure of one drying tower distributed to the other drying tower is adjusted, and the gas flow rate of one drying tower distributed to the other drying tower is controlled, so as to realize the pressure swing adsorption of the pressure swing drying assembly, thereby taking out the moisture inside the other drying tower to realize the regeneration of the other drying tower.

[0019] According to some embodiments of the present utility model, the present utility model further includes a gas-liquid separator and a water tank. The gas-liquid separator includes an air inlet, an air outlet, a liquid discharge port and a mixing inlet. The air inlet is connected to the gas outlet end of the hydrogen production system, the air outlet is connected to the hydrogen inlet, the mixing inlet is connected to the mixing outlet, and the liquid discharge port is connected to the water tank.

[0020] The hydrogen recovery system further includes a gas-liquid separator. The inlet of the gas-liquid separator is connected to the outlet end of the hydrogen production system, and the exhaust port is connected to the hydrogen inlet. That is, the gas-liquid separator is arranged between the hydrogen production system and the pressure swing drying assembly. The hydrogen generated by the hydrogen production system is first introduced into the gas-liquid separator to remove part of the moisture in the hydrogen. The mixing inlet is connected to the mixing outlet. That is, the mixed gas in the ejector passes through the mixing outlet and the mixing inlet and then is conducted into the gas-liquid separator to remove part of the moisture in the mixed gas. The mixed gas can be conducted to the pressure swing drying assembly again from the exhaust port to realize the recovery of the hydrogen used for regeneration. The liquid discharge port is connected to the water tank. When the liquid in the gas-liquid separator reaches the preset amount, the liquid in the gas-liquid separator can be discharged into the water tank through the connection between the liquid discharge port and the water tank to realize the recovery of the liquid.

[0021] According to some embodiments of the present invention, the present invention further includes a deoxidation assembly, and the deoxidation assembly is connected between the exhaust port and the hydrogen inlet.

[0022] Specifically, the hydrogen recovery system further includes a deoxidation assembly, and the deoxidation assembly is connected between the exhaust port and the hydrogen inlet. That is, the deoxidation assembly is connected between the gas-liquid separator and the pressure swing drying assembly. The hydrogen generated by the hydrogen production system removes part of the moisture in the gas-liquid separator and then is introduced into the deoxidation assembly to remove the oxygen in the hydrogen. The deoxidized hydrogen is then introduced into the pressure swing drying assembly to realize drying, so as to realize the purification of the hydrogen generated by the hydrogen production system.

[0023] According to some embodiments of the present invention, the present invention further includes a memory, a third control valve, and a fourth control valve. The inlet end of the memory is connected to the first buffer tank. The third control valve is used to control the on-off between the memory and the first buffer tank, and the fourth control valve is used to control the opening and closing of the outlet end of the memory.

[0024] The hydrogen recovery system further includes a memory. The third control valve is used to control the on-off between the memory and the first buffer tank so that the purified hydrogen is introduced into the memory to realize the storage of hydrogen. The fourth control valve is used to control the opening and closing of the outlet end of the memory. When the peripheral device has a demand for hydrogen, the fourth control valve can open the outlet end of the memory to realize the supply of hydrogen.

[0025] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present invention. Description of the Drawings

[0026] The following further describes the present invention in conjunction with the drawings and embodiments, where:

[0027] Figure 1 It is a layout schematic diagram of a hydrogen recovery system according to an embodiment of the present invention;

[0028] Figure 2 Schematic layout diagram of the pressure swing drying assembly of a hydrogen recovery system according to an embodiment of the present utility model;

[0029] Figure 3 Schematic layout diagram of another state of the pressure swing drying assembly of a hydrogen recovery system according to an embodiment of the present utility model.

[0030] Reference numerals in the drawings:

[0031] 100, pressure swing drying assembly; 110, drying tower; 111, hydrogen inlet; 112, dried gas outlet; 113, regeneration gas outlet; 120, three-way valve; 121, first port; 122, second port; 123, third port; 130, pressure swing valve;

[0032] 200, compressor;

[0033] 300, ejector; 310, first ejector inlet; 320, second ejector inlet; 330, mixing outlet;

[0034] 410, first buffer tank; 420, second buffer tank; 430, third buffer tank;

[0035] 510, first control valve; 520, second control valve; 530, third control valve; 540, fourth control valve;

[0036] 600, gas-liquid separator; 610, gas inlet; 620, exhaust port; 630, liquid discharge port; 640, mixing inlet;

[0037] 700, deoxidation assembly;

[0038] 800, memory;

[0039] 900, hydrogen production system. Detailed implementation manners

[0040] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals indicate the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0041] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as up and down, etc., is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0042] In the description of the present utility model, "a plurality of" refers to more than two. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features or implicitly specifying the sequence relationship of the indicated technical features.

[0043] In the description of the present utility model, unless otherwise clearly defined, terms such as "arrangement", "installation", and "connection" should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present utility model in combination with the specific content of the technical solution.

[0044] Refer to Figures 1 to 3 As shown in the figure, a hydrogen recovery system according to an embodiment of the present utility model is applied to recover hydrogen generated by a hydrogen production system 900. Specifically, the hydrogen production system 900 can be a proton exchange membrane electrolyzer hydrogen production system (Proton Exchange Membrane, PEM). The hydrogen recovery system includes a pressure swing drying assembly 100, a first buffer tank 410, a first control valve 510, a compressor 200, and an ejector 300.

[0045] Refer to Figure 1 As shown in the figure, the pressure swing assembly includes two switching valves and two drying towers 110 connected to each other. The two switching valves are respectively connected to the two drying towers 110 to form two branches. The two switching valves are used to switch the two drying towers 110 to the drying state and the regeneration state respectively, that is, through the cooperation of the two switching valves, the two drying towers 110 are alternately switched between the drying state and the regeneration state, so that one of the drying towers 110 is in the drying state and the other drying tower 110 is in the regeneration state. The drying state means that the inlet of the drying tower 110 is the hydrogen inlet 111 and the outlet is the dry gas outlet 112, and the regeneration state means that the outlet of the drying tower 110 is the regeneration gas outlet 113.

[0046] Refer to Figure 1 As shown in the figure, the gas outlet end of the hydrogen production system 900 is communicated with the hydrogen inlet 111 of the drying tower 110 in the drying state. The inlet end of the compressor 200 is connected to the dry gas outlet 112 of the drying tower 110 in the drying state, and the outlet end of the compressor 200 is connected to the first buffer tank 410.

[0047] Refer to Figure 1 As shown in the figure, the ejector 300 has a first ejector inlet 310, a second ejector inlet 320, and a mixing outlet 330. The first ejector inlet 310 is connected to the first buffer tank 410, the second ejector inlet 320 is connected to the regeneration gas outlet 113, and the mixing outlet 330 is connected to the hydrogen inlet 111. The first control valve 510 is used to control the on-off of the first ejector inlet 310 and the first buffer tank 410.

[0048] Referring to Figure 1 As shown, the hydrogen recovery system includes a pressure swing drying assembly 100. The pressure swing drying assembly 100 includes two drying towers 110 that are connected and communicate with each other. When the inlet of one drying tower 110 is the hydrogen inlet 111 and the outlet is the dry gas outlet 112, the hydrogen inlet 111 is connected to the gas outlet end of the hydrogen production system 900. That is, the hydrogen produced by the hydrogen production system 900 passes through the hydrogen inlet 111 and enters the drying tower 110. Under the drying effect of the drying tower 110, the drying treatment of hydrogen is achieved. The dry gas outlet 112 is connected to the intake end of the compressor 200, and the two drying towers 110 are connected. Most of the dried hydrogen passes through the dry gas outlet 112 and enters the compressor 200. A small part of the dried hydrogen enters the other drying tower 110 to carry out the moisture in the other drying tower 110, so that the drying tower 110 is regenerated. The hydrogen carrying a large amount of moisture is discharged from the regeneration gas outlet 113.

[0049] When the compressor 200 operates, it can play a pressurizing role, that is, increase the pressure of the hydrogen flowing into the first buffer tank 410, so that high-pressure hydrogen is formed in the first buffer tank 410. The setting of the first buffer tank 410 is beneficial to reducing the pressure fluctuation of the high-pressure hydrogen, making the pressure of the high-pressure hydrogen more stable and reliable. The first buffer tank 410 is connected to the first injection inlet 310. The first control valve 510 is used to control the on-off between the first injection inlet 310 and the first buffer tank 410. The setting of the first buffer tank 410 can keep the pressure of the high-pressure hydrogen within a preset range.

[0050] Referring to Figure 1 As shown, since the first injection inlet 310 is connected to the first buffer tank 410, when the first control valve 510 is opened, the high-pressure hydrogen can pass through the first injection inlet 310 and enter the ejector 300. Through the jet flow of the high-pressure hydrogen, a negative pressure is generated at the second injection inlet 320. The second injection inlet 320 is connected to the regeneration gas outlet 113, so that the hydrogen for regeneration passes through the second injection inlet 320 and enters the ejector 300, that is, the injection of the hydrogen for regeneration is realized, and the high-pressure hydrogen and the hydrogen for regeneration are mixed in the ejector 300. Since the mixing outlet 330 is connected to the hydrogen inlet 111, the mixed hydrogen is passed through the pressure swing drying assembly 100 again for drying. That is, the hydrogen recovery system can not only recover the hydrogen produced by the hydrogen production system 900, but also recover the hydrogen for regeneration, and by means of the injection of the ejector 300, the energy consumption and cost of recovering the hydrogen for regeneration are relatively low.

[0051] Referring to Figure 1As shown, compared with the method of directly compressing the hydrogen for regeneration by the hydrogen compressor 200, it is beneficial to avoid the problem that the impeller of the hydrogen compressor 200 is damaged by hydrogen carrying a large amount of moisture. Through the pressurization of the compressor 200 and the storage of the first buffer tank 410, the hydrogen recovery system maintains the pressure of the obtained high-pressure hydrogen within a preset range. Using high-pressure hydrogen as the working fluid to achieve the ejection of the hydrogen for regeneration, the ejection effect is better, and the ejector 300 operates only under a single load condition to ensure the stable operation of the ejector 300, so that the drying tower 110 into which dry hydrogen is introduced is regenerated within a preset time.

[0052] Refer to Figure 1 As shown, considering that it is difficult for the ejector 300 to take into account both low-load conditions and high-load conditions at the same time. If the basic dimensions of the ejector 300 are designed according to the low-load conditions, it may cause the working fluid pressure of the ejector 300 to be too high under high-load conditions, resulting in a shock wave in the mixing chamber of the ejector 300; if the basic dimensions of the ejector 300 are designed according to the high-load conditions, it may cause the pressure rise of the ejector 300 not to meet the system requirements under low-load conditions, and the ejection effect is poor. Therefore, the hydrogen recovery system provided by the embodiment of the present invention obtains high-pressure hydrogen through the operation of the compressor 200 and the storage of the first buffer tank 410, and maintains the pressure of the high-pressure hydrogen within a preset range, so that the ejector 300 operates only under a single load condition to ensure the stable operation of the ejector 300, so that the drying tower 110 into which dry hydrogen is introduced is regenerated within a preset time.

[0053] Refer to Figure 1 As shown, it can be understood that the hydrogen recovery system further includes a gas-liquid separator 600 and a water tank. The gas-liquid separator 600 includes an air inlet 610, an air outlet 620, a liquid discharge port 630 and a mixing inlet 640. The air inlet 610 is connected to the outlet end of the hydrogen production system 900, the air outlet 620 is connected to the hydrogen inlet 111, the mixing inlet 640 is connected to the mixing outlet 330, and the liquid discharge port 630 is connected to the water tank.

[0054] Refer to Figure 1As shown, the inlet 610 of the gas-liquid separator 600 is connected to the outlet end of the hydrogen production system 900, and the exhaust port 620 is connected to the hydrogen inlet 111. That is, the gas-liquid separator 600 is disposed between the hydrogen production system 900 and the pressure swing drying assembly 100. The hydrogen generated by the hydrogen production system 900 is first introduced into the gas-liquid separator 600 to remove some moisture from the hydrogen, and then introduced into the pressure swing drying assembly 100. The mixing inlet 640 is connected to the mixing outlet 330. That is, the mixed gas in the ejector 300 is conducted into the gas-liquid separator 600 after passing through the mixing outlet 330 and the mixing inlet 640, so as to remove some moisture from the mixed gas. The mixed gas can be conducted into the pressure swing drying assembly 100 again from the exhaust port 620 to realize the recovery of the hydrogen used for regeneration. The drain port 630 is connected to the water tank. When the liquid in the gas-liquid separator 600 reaches the preset amount, the liquid in the gas-liquid separator 600 can be discharged into the water tank through the connection between the drain port 630 and the water tank to realize the recovery of the liquid.

[0055] Referring to Figure 1 As shown, it can be understood that the hydrogen recovery system further includes a deoxidation assembly 700, and the deoxidation assembly 700 is connected between the exhaust port 620 and the hydrogen inlet 111.

[0056] Referring to Figure 1 As shown, that is, the deoxidation assembly 700 is connected between the gas-liquid separator 600 and the pressure swing drying assembly 100. The hydrogen generated by the hydrogen production system 900 removes some moisture in the gas-liquid separator 600 and then is introduced into the deoxidation assembly 700 to remove oxygen in the hydrogen. The deoxidized hydrogen is then introduced into the pressure swing drying assembly 100 for drying treatment to realize the purification of the hydrogen generated by the hydrogen production system 900.

[0057] Referring to Figure 1 As shown, it should be noted that the structures of the gas-liquid separator 600 and the deoxidation assembly 700 are common knowledge in the art and will not be elaborated here.

[0058] Referring to Figure 1 As shown, it can be understood that the hydrogen recovery system further includes a second buffer tank 420.

[0059] Referring to Figure 1 As shown, wherein, the second buffer tank 420 is connected between the dry gas outlet 112 and the inlet end of the compressor 200. That is, the dried hydrogen after drying treatment is first introduced into the second buffer tank 420 and then into the compressor 200, which is beneficial to making the gas pressure flowing into the compressor 200 more stable, beneficial to making the load of the compressor 200 more stable, beneficial to improving the service life of the compressor 200, and reducing the risk of damage to the compressor 200.

[0060] Referring to Figure 1As shown, the compressor 200 is disposed between the second buffer tank 420 and the first buffer tank 410, which is conducive to making the pressure at the intake end and the outlet end of the compressor 200 more stable, so that the compressor 200 operates under relatively stable working conditions, which is beneficial to improving the service life of the compressor 200 and reducing the risk of damage to the compressor 200.

[0061] Referring to Figure 1 As shown, it can be understood that the hydrogen recovery system further includes a third buffer tank 430 and a second control valve 520. The third buffer tank 430 is connected between the regenerated gas outlet 113 and the second ejector inlet 320. That is, the hydrogen flowing out of the regenerated gas outlet 113 first enters the third buffer tank 430, and the third buffer tank 430 is used to temporarily store the hydrogen for regeneration. The second control valve 520 is used to control the on-off between the third buffer tank 430 and the second ejector inlet 320. When the second control valve 520 is opened, under the ejecting action of the ejector 300, the wet hydrogen in the third buffer tank 430 can be introduced into the ejector 300 to realize the mixing of the hydrogen for regeneration and the high-pressure hydrogen. The mixed gas is then introduced into the pressure swing drying assembly 100 from the mixing outlet 330 to realize the recovery of the hydrogen for regeneration.

[0062] Referring to Figure 1 、 Figure 2 and Figure 3 As shown, it can be understood that specifically, the switching valve is a three-way valve 120. The first port 121 is connected to the outlet end of the hydrogen production system 900, the second port 122 is connected to the second ejector inlet 320, and the third port 123 is connected to the drying tower 110.

[0063] When the first port 121 is communicated with the outlet end of the hydrogen production system 900, the second port 122 is closed, and the third port 123 is communicated with the drying tower 110, so that the corresponding drying tower 110 is switched to the drying state.

[0064] When the first port 121 is disconnected from the outlet end of the hydrogen production system 900, the second port 122 is opened, and the third port 123 is communicated with the drying tower 110, so that the corresponding drying tower 110 is switched to the regeneration state. The hydrogen flowing out of the drying tower 110 in the drying state can be partially conducted into the drying tower 110 in the regeneration state, and the moisture in the drying tower 110 in the regeneration state is carried out by the hydrogen. The hydrogen carrying a large amount of moisture enters the third port 123 of the corresponding three-way valve 120 from the regenerated gas outlet 113 and is conducted to the second ejector inlet 320 from the second port 122 to realize the recovery of the hydrogen for regeneration.

[0065] Referring to Figure 1 、 Figure 2 and Figure 3As shown, two switching valves are connected to two drying towers 110 to form two branches, which are respectively named the first branch and the second branch. The following takes the drying towers 110 of the first branch and the drying towers 110 of the second branch as examples to illustrate the alternation between the drying state and the regeneration state.

[0066] Referring to Figure 1 and Figure 2 As shown, when the drying tower 110 of the first branch is in the drying state and the drying tower 110 of the second branch is in the regeneration state, the first port 121 and the third port 123 of the three-way valve 120 of the first branch are opened, and the second port 122 is closed. The gas outlet end of the hydrogen production system 900 is communicated with the first port 121 of the three-way valve 120 of the first branch. The generated hydrogen passes through the first port 121 and the third port 123 of the three-way valve 120 of the first branch and then conducts to the hydrogen inlet 111 of the drying tower 110 of the first branch. The generated hydrogen is dried at the drying tower 110 of the first branch. Most of the dried hydrogen is conducted to the compressor 200 through the dry gas outlet 112 for compression treatment, while a small part of the dried hydrogen is conducted into the drying tower 110 of the second branch to carry out the moisture of the drying tower 110 of the second branch. The hydrogen carrying a large amount of moisture flows out from the regeneration gas outlet 113 of the drying tower 110 of the second branch to the three-way valve 120 on the second branch. The first port 121 of the three-way valve 120 of the second branch is closed, while the second port 122 and the third port 123 are both opened. The hydrogen flowing out of the drying tower 110 of the second branch passes through the third port 123 and the second port 122 of the three-way valve 120 of the second branch, so that the hydrogen for regeneration is conducted to the third buffer tank 430 to realize the temporary storage of wet hydrogen.

[0067] Referring to Figure 1 and Figure 3As shown, when the drying tower 110 of the second branch is in the drying state and the drying tower 110 of the first branch is in the regeneration state, the first port 121 and the third port 123 of the three-way valve 120 of the second branch are opened, and the second port 122 is closed. The gas outlet end of the hydrogen production system 900 is communicated with the first port 121 of the three-way valve 120 of the second branch. The generated hydrogen passes through the first port 121 and the third port 123 of the three-way valve 120 of the second branch and then is conducted to the hydrogen inlet 111 of the drying tower 110 of the second branch. The generated hydrogen is dried at the drying tower 110 of the second branch. Most of the dried hydrogen is conducted to the compressor 200 through the dry gas outlet 112 for compression treatment, while a small part of the dried hydrogen is conducted into the drying tower 110 of the first branch to carry out the moisture of the drying tower 110 of the first branch. The hydrogen carrying a large amount of moisture flows out from the regeneration gas outlet 113 of the drying tower 110 of the first branch to the three-way valve 120 on the first branch. The first port 121 of the three-way valve 120 of the first branch is closed, while the second port 122 and the third port 123 are both opened. The hydrogen flowing out from the drying tower 110 of the first branch passes through the third port 123 and the second port 122 of the three-way valve 120 of the first branch, so that the hydrogen for regeneration is conducted to the third buffer tank 430 to realize the temporary storage of wet hydrogen.

[0068] Referring to Figure 1 As shown, it can be understood that the hydrogen recovery system further includes a pressure regulating valve 130. Both drying towers 110 are connected to the pressure regulating valve 130, that is, the two drying towers 110 are connected through the pressure regulating valve 130. Under the adjustment of the pressure regulating valve 130, the gas pressure distributed from one drying tower 110 to the other drying tower 110 is adjusted, and the gas flow rate distributed from one drying tower 110 to the other drying tower 110 is controlled, so as to realize the pressure swing adsorption of the pressure swing drying assembly 100. The moisture inside the other drying tower 110 is carried out by drying hydrogen, so that the other drying tower 110 completes regeneration.

[0069] Specifically, the pressure regulating valve 130 is a microporous valve. By controlling the aperture of the microporous valve, the gas pressure and flow rate distributed from the drying tower 110 in the drying state to the drying tower 110 in the regeneration state are adjusted.

[0070] It should be understood that in some other embodiments, the pressure regulating valve 130 may be a proportional valve. Through the adjustment of the proportional valve, the gas pressure and flow rate distributed from the drying tower 110 in the drying state to the drying tower 110 in the regeneration state can be adjusted.

[0071] Referring to Figure 1As shown, it can be understood that in this embodiment, the hydrogen recovery system further includes a memory 800, a third control valve 530, and a fourth control valve 540. The intake end of the memory 800 is connected to the first buffer tank 410. The third control valve 530 is used to control the connection and disconnection between the memory 800 and the first buffer tank 410, and the fourth control valve 540 is used to control the opening and closing of the outlet end of the memory 800.

[0072] Referring to Figure 1 As shown, the third control valve 530 is used to control the connection and disconnection between the memory 800 and the first buffer tank 410, so that the purified hydrogen gas can be introduced into the memory 800 to achieve the storage of hydrogen gas. The fourth control valve 540 is used to control the opening and closing of the outlet end of the memory 800. When the peripheral device has a demand for hydrogen gas, the fourth control valve 540 can open the outlet end of the memory 800 to achieve the supply of hydrogen gas.

[0073] The setting of the first buffer tank 410 can ensure that when the ejector 300 needs to be used to recover the hydrogen gas for regeneration, there can be a continuous supply of high-pressure hydrogen gas as the working fluid, without being affected by the pressure reduction of the memory 800 due to the supply of hydrogen gas.

[0074] Referring to Figure 1 As shown, specifically, considering that the hydrogen gas for regeneration carries a large amount of moisture, there will be liquid accumulation in the third buffer tank 430 that temporarily stores the hydrogen gas for regeneration. The third buffer tank 430 is provided with a drain port and a drain valve. The drain valve is used to control the opening and closing of the drain port. When the liquid in the third buffer tank 430 reaches the preset amount, the drain valve can be controlled to open to achieve the drainage of the third buffer tank 430. The third buffer tank 430 is also connected to a pressure relief valve, and the pressure relief valve is used to control the connection and disconnection between the third buffer tank 430 and the external environment.

[0075] The first buffer tank 410, the second buffer tank 420, and the third buffer tank 430 are respectively connected with pressure sensors. The internal pressures of the first buffer tank 410, the second buffer tank 420, and the third buffer tank 430 are respectively monitored by the multiple pressure sensors, so as to facilitate the pressure control of the first buffer tank 410, the second buffer tank 420, and the third buffer tank 430.

[0076] The control principle of the first buffer tank 410 is as follows: The pressure of the first buffer tank 410 is monitored by the pressure sensor. When the pressure of the first buffer tank 410 is greater than the first set upper limit, the third control valve 530 can be controlled to open, so as to introduce the high-pressure hydrogen gas in the first buffer tank 410 into the memory 800 to achieve the storage of high-pressure hydrogen gas. At the same time, the pressure of the first buffer tank 410 is monitored. When the pressure of the first buffer tank 410 is less than the first set lower limit, the third control valve 530 is controlled to close, that is, the inflation of the memory 800 by the first buffer tank 410 is stopped.

[0077] The control principle of the second buffer tank 420 is as follows: The pressure of the second buffer tank 420 is monitored by a pressure sensor. When the pressure of the second buffer tank 420 is greater than the second set upper limit, the compressor 200 is controlled to operate. Under the boosting effect of the compressor 200, the hydrogen in the second buffer tank 420 is pressurized and then introduced into the first buffer tank 410, so that high-pressure hydrogen is formed in the first buffer tank 410. The high-pressure hydrogen can be used as the working fluid of the ejector 300 to realize the ejection of the hydrogen for regeneration. At the same time, the pressure of the second buffer tank 420 is monitored. When the pressure of the second buffer tank 420 is less than the second set lower limit, the compressor 200 is controlled to stop operating, that is, the pressurization treatment of hydrogen is stopped.

[0078] The control principle of the third buffer tank 430 is as follows: The pressure of the third buffer tank 430 is monitored by a pressure sensor. When the pressure of the third buffer tank 430 is greater than the third set upper limit, it is judged whether the pressure of the first buffer tank 410 is greater than the first set upper limit. When the pressure of the first buffer tank 410 is greater than the first set upper limit, the first control valve 510 is controlled to open first, and the high-pressure hydrogen is introduced into the ejector 300, so that a negative pressure is formed at the second injection inlet 320. Then the second control valve 520 is controlled to open to realize the ejection of the wet hydrogen in the third buffer tank 430, so as to realize the recovery of the wet hydrogen. At the same time, the pressure of the third buffer tank 430 is monitored. When the pressure of the third buffer tank 430 is less than the third set lower limit, the second control valve 520 is closed first, and then the first control valve 510 is closed, that is, the connection between the third buffer tank 430 and the ejector 300, and the connection between the first buffer tank 410 and the ejector 300 are blocked; when the pressure of the third buffer tank 430 is greater than the third set upper limit, but the pressure of the first buffer tank 410 is less than the first set lower limit, the pressure relief valve is opened at this time to reduce the pressure of the third buffer tank 430, so as to avoid the problem that the pressure of the third buffer tank 430 exceeds the set pressure range. At the same time, the pressure of the third buffer tank 430 is monitored. When the pressure of the third buffer tank 430 is less than the third set lower limit, the pressure relief valve is closed.

[0079] Refer to Figure 1 As shown, the pressure range of the first buffer tank 410 is set at about 15 Mpa, and the first set upper limit and the first set lower limit can be selected within the pressure range of the first buffer tank 410. The pressure range of the second buffer tank 420 is set at 3 to 4 Mpa, and the second set upper limit and the second set lower limit can be selected within the pressure range of the second buffer tank 420. The pressure range of the third buffer tank 430 should be slightly greater than the atmospheric pressure. Therefore, the pressure range of the third buffer tank 430 can be set below 1 Mpa, and the third set upper limit and the third set lower limit can be selected within the pressure range of the third buffer tank 430.

[0080] It should be understood that in some other embodiments, the hydrogen recovery system can set a preset time interval. When the opening time of the first control valve 510 and the second control valve 520 reaches the preset time interval, the hydrogen recovery system can close the second control valve 520 and the first control valve 510 in sequence. It should be noted that the first control valve 510, the second control valve 520, the third control valve 530 and the fourth control valve 540 can be solenoid valves. The solenoid valves have excellent sealing performance, can ensure a good sealing effect, avoid fluid leakage, and can realize remote control of the first control valve 510, the second control valve 520, the third control valve 530 and the fourth control valve 540.

[0081] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. A hydrogen recovery system for recovering hydrogen generated by a hydrogen production system (900), characterized in that, The hydrogen recovery system includes: A pressure swing drying assembly (100) comprising two drying towers (110) connected to each other. The inlet of one of the drying towers (110) is a hydrogen inlet (111), and the outlet is a dried gas outlet (112). The hydrogen inlet (111) is connected to the gas outlet end of the hydrogen production system (900). The outlet of the other drying tower (110) is a regeneration gas outlet (113); A first buffer tank (410) connected to the dried gas outlet (112); An ejector (300) having a first ejecting inlet (310), a second ejecting inlet (320), and a mixing outlet (330). The first ejecting inlet (310) is connected to the first buffer tank (410), the second ejecting inlet (320) is connected to the regeneration gas outlet (113), and the mixing outlet (330) is connected to the hydrogen inlet (111); A first control valve (510) for controlling the on / off of the connection between the first ejecting inlet (310) and the first buffer tank (410).

2. The hydrogen recovery system according to claim 1, wherein: It further includes a compressor (200). The intake end of the compressor (200) is connected to the dried gas outlet (112), and the outlet end of the compressor (200) is connected to the first buffer tank (410).

3. The hydrogen recovery system according to claim 2, wherein: It further includes a second buffer tank (420) connected between the dried gas outlet (112) and the intake end of the compressor (200).

4. The hydrogen recovery system according to claim 1, wherein: It further includes a third buffer tank (430) and a second control valve (520). The third buffer tank (430) is connected between the regeneration gas outlet (113) and the second ejecting inlet (320), and the second control valve (520) is used to control the on / off of the connection between the third buffer tank (430) and the second ejecting inlet (320).

5. The hydrogen recovery system according to claim 1, wherein: The pressure swing drying assembly (100) further includes two switching valves respectively connected to the two drying towers (110). The switching valves are used to switch the two drying towers (110) to the drying state and the regeneration state respectively. The drying state means that the inlet of the drying tower (110) is the hydrogen inlet (111) and the outlet is the dried gas outlet (112), and the regeneration state means that the outlet of the drying tower (110) is the regeneration gas outlet (113).

6. The hydrogen recovery system according to claim 5, wherein: The switching valve is a three-way valve (120) having a first port (121), a second port (122), and a third port (123). The first port (121) is connected to the gas outlet end of the hydrogen production system (900), the second port (122) is connected to the second ejecting inlet (320), and the third port (123) is connected to the drying tower (110).

7. The hydrogen recovery system according to claim 1, wherein: It further includes a pressure regulating valve (130). Both of the two drying towers (110) are connected to the pressure regulating valve (130). The pressure regulating valve (130) is used to adjust the gas pressure distributed from one drying tower (110) to the other drying tower (110).

8. The hydrogen recovery system according to claim 1, wherein: It further includes a gas-liquid separator (600) and a water tank. The gas-liquid separator (600) includes an air inlet (610), an exhaust port (620), a liquid discharge port (630), and a mixing inlet (640). The air inlet (610) is connected to the gas outlet end of the hydrogen production system (900), the exhaust port (620) is connected to the hydrogen inlet (111), the mixing inlet (640) is connected to the mixing outlet (330), and the liquid discharge port (630) is connected to the water tank.

9. The hydrogen recovery system according to claim 8, wherein: It further includes a deoxidation component (700), and the deoxidation component (700) is connected between the exhaust port (620) and the hydrogen inlet (111).

10. The hydrogen recovery system according to claim 2, characterized in that: It further includes a memory (800), a third control valve (530), and a fourth control valve (540). The gas inlet end of the memory (800) is connected to the first buffer tank (410). The third control valve (530) is used to control the on-off between the memory (800) and the first buffer tank (410), and the fourth control valve (540) is used to control the opening and closing of the gas outlet end of the memory (800).

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