Hydrogen production system

Abstract

The invention discloses a hydrogen production system which comprises an AEM electric pile, a hydrogen side gas-liquid separator, a hydrogen side gas-water separator, a gas-liquid separation discharge valve, a liquid level detection device and a control module, and the AEM electric pile comprises a hydrogen side outlet and a liquid inlet; the hydrogen side gas-liquid separator comprises a first inlet and a first liquid phase outlet, the first inlet is communicated with the hydrogen side outlet, and the first liquid phase outlet is communicated with the liquid inlet through a backflow pipeline; the gas-liquid separation discharge valve is arranged at the first liquid phase outlet or on the backflow pipeline; the liquid level detection device is used for detecting the liquid level height in the hydrogen side gas-liquid separator; the control module controls opening and closing of the gas-liquid separation discharge valve according to a detection value signal of the liquid level detection device. According to the invention, the gas-liquid separation discharge valve is additionally arranged on the hydrogen side to control the discharge of the liquid in the hydrogen side gas-liquid separator, so that the hydrogen in the hydrogen side gas-liquid separator is effectively prevented or reduced from flowing back to a galvanic pile along with alkali liquor, the hydrogen production process is promoted to be normally and orderly carried out, and the resource waste is reduced.

Description

Technical Field

[0001] The present invention generally relates to the technical field of hydrogen production, and more particularly to a hydrogen production system. Background Art

[0002] At present, the technology of AEM water electrolysis hydrogen production equipment is still immature, and most of them use the hydrogen production process of alkaline water electrolyzer. Among them, the liquid phase outlet of the hydrogen-side gas-liquid separator is connected to the fuel cell stack through a reflux pipeline, and the reflux pipeline is always in a connected state. The alkaline liquid separated in the hydrogen-side gas-liquid separator can directly flow back to the fuel cell stack, but a part of the separated hydrogen will also flow back to the fuel cell stack with the alkaline liquid, which will hinder the hydrogen production process and cause unnecessary waste of resources.

[0003] Therefore, it is necessary to provide a hydrogen production system to at least partially solve the above problems. Summary of the invention

[0004] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0005] In order to at least partially solve the above problems, a first aspect of the present invention provides a hydrogen production system, comprising:

[0006] An AEM stack, the AEM stack comprising a hydrogen side outlet and a liquid inlet;

[0007] A hydrogen-side gas-liquid separator, the hydrogen-side gas-liquid separator comprising a first inlet and a first liquid phase outlet, wherein the first inlet is communicated with the hydrogen-side outlet, and the first liquid phase outlet is communicated with the liquid inlet through a reflux pipeline;

[0008] A gas-liquid separation discharge valve, which is arranged at the first liquid phase outlet or on the reflux pipeline;

[0009] A liquid level detection device, the liquid level detection device is used to detect the liquid level height in the hydrogen side gas-liquid separator;

[0010] A control module, the control module is electrically connected to the gas-liquid separation discharge valve and the liquid level detection device, and the control module is used to receive the detection value signal of the liquid level detection device and control the opening and closing of the gas-liquid separation discharge valve;

[0011] When the detection value of the liquid level detection device exceeds a preset value, the control module controls the gas-liquid separation discharge valve to open; when the detection value of the liquid level detection device is lower than a preset value, the control module controls the gas-liquid separation discharge valve to close.

[0012] Optionally, the AEM stack further includes an oxygen side outlet;

[0013] The hydrogen manufacturing system further includes an oxygen-side gas-liquid separator, the oxygen-side gas-liquid separator includes a second inlet and a second liquid phase outlet, the second inlet is in communication with the oxygen-side outlet;

[0014] The hydrogen production system further comprises a reflux branch, both ends of which are respectively connected to the second liquid phase outlet and the reflux pipeline;

[0015] The gas-liquid separation discharge valve is arranged on the reflux pipeline and is located between the connection point between the reflux branch and the reflux pipeline and the first liquid phase outlet.

[0016] Optionally, the hydrogen-side gas-liquid separator further includes a first gas phase outlet;

[0017] The hydrogen production system also includes a hydrogen output pipeline, a hydrogen side pressure regulating valve and a hydrogen side pressure detection device;

[0018] Wherein, the hydrogen output pipeline is communicated with the first gas phase outlet, the hydrogen side pressure regulating valve is arranged on the hydrogen output pipeline, and the hydrogen side pressure detection device is used to detect the pressure in the hydrogen side gas-liquid separator;

[0019] The control module is electrically connected to the hydrogen side pressure regulating valve and the hydrogen side pressure detecting device respectively, and the control module is also used to receive the detection value signal of the hydrogen side pressure detecting device and control the opening degree of the hydrogen side pressure regulating valve.

[0020] Optionally, the AEM stack further includes an oxygen side outlet;

[0021] The hydrogen manufacturing system further includes an oxygen-side gas-liquid separator, the oxygen-side gas-liquid separator includes a second inlet and a second gas phase outlet, the second inlet is in communication with the oxygen-side outlet;

[0022] The hydrogen production system also includes an oxygen output pipeline, an oxygen side pressure regulating valve and an oxygen side pressure detection device;

[0023] Wherein, the oxygen output pipeline is connected to the second gas phase outlet, the oxygen side pressure regulating valve is arranged on the oxygen output pipeline, and the oxygen side pressure detection device is used to detect the pressure in the oxygen side gas-liquid separator;

[0024] The control module is electrically connected to the oxygen side pressure regulating valve and the oxygen side pressure detecting device respectively, and is also used to receive the detection value signal of the oxygen side pressure detecting device and control the opening degree of the oxygen side pressure regulating valve.

[0025] Optionally, the hydrogen side pressure regulating valve and / or the oxygen side pressure regulating valve is a PID regulating valve.

[0026] Optionally, the hydrogen production system further includes a hydrogen cooler and a hydrogen-side gas-water separator;

[0027] The inlet of the hydrogen cooler is communicated with the first gas phase outlet, the outlet of the hydrogen cooler is communicated with the inlet of the hydrogen side gas-water separator, and the third gas phase outlet of the hydrogen side gas-water separator is communicated with the hydrogen output pipeline.

[0028] Optionally, the hydrogen production system further includes a hydrogen-side water collector and a gas-water separation discharge valve;

[0029] The inlet of the hydrogen-side water collector is connected to the third liquid phase outlet of the hydrogen-side gas-water separator;

[0030] The gas-water separation discharge valve is arranged on the communication pipeline between the hydrogen-side gas-water separator and the hydrogen-side water collector.

[0031] Optionally, the hydrogen manufacturing system also includes a hydrogen side vent valve, which is arranged on the hydrogen output pipeline. Along the gas flow path in the hydrogen output pipeline, the hydrogen side vent valve is located downstream of the hydrogen side pressure regulating valve. The hydrogen side vent valve is used to control the opening and closing of the outlet end of the hydrogen output pipeline.

[0032] Optionally, the hydrogen production system further comprises: a heat exchanger and a heater;

[0033] The inlet of the heat exchanger is communicated with the reflux pipeline, the outlet of the heat exchanger is communicated with the inlet of the heater, and the outlet of the heater is communicated with the liquid inlet of the AEM stack.

[0034] Optionally, the hydrogen production system further comprises a lye tank, and the lye tank is connected to the inlet of the heater.

[0035] According to a hydrogen manufacturing system of the present invention, a gas-liquid separation discharge valve is added between the hydrogen-side gas-liquid separator and the AEM fuel cell stack. Only when the alkaline liquid in the hydrogen-side gas-liquid separator accumulates to a certain amount, the gas-liquid separation discharge valve will be opened to achieve the reflux of the alkaline liquid. Due to the setting of the gas-liquid separation discharge valve, the first liquid phase outlet of the hydrogen-side gas-liquid separator and the liquid inlet of the AEM fuel cell stack are not always in a connected state, which effectively prevents or reduces the hydrogen in the hydrogen-side gas-liquid separator from flowing back to the AEM fuel cell stack along with the alkaline liquid, promotes the normal and orderly progress of the hydrogen production process, and reduces resource waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The following drawings of the embodiments of the present invention are used as part of the present invention for understanding the present invention. The embodiments of the present invention and their description are shown in the drawings to explain the principles of the present invention. In the drawings,

[0037] Figure 1 A schematic structural diagram of a hydrogen production system according to a preferred embodiment of the present invention;

[0038] Figure 2 for Figure 1 A partial enlarged schematic diagram of part A;

[0039] Figure 3 The figure is a schematic diagram of the electrical control principle of a hydrogen production system according to a preferred embodiment of the present invention.

[0040] Description of reference numerals:

[0041] 111: AEM stack 11: Hydrogen side outlet

[0042] 12: Oxygen side outlet 13: Liquid inlet

[0043] 112: Alkali liquid circulation pump 113: Heat exchanger

[0044] 114: Heater 120: Return line

[0045] 121: Gas-liquid separation discharge valve 122: Hydrogen side gas-liquid separator

[0046] 21: First inlet 22: First liquid phase outlet

[0047] 23: First gas phase outlet 24: Hydrogen side pressure detection device

[0048] 123: Hydrogen cooler 124: Hydrogen side gas-water separator

[0049] 25: Third gas phase outlet 26: Third liquid phase outlet

[0050] 125: Gas-water separation discharge valve 126: Hydrogen side water collector

[0051] 127: Hydrogen side pressure regulating valve 128: Hydrogen side vent valve

[0052] 129: Liquid level detection device 200: Hydrogen output pipeline

[0053] 130: Reflux branch 131: Oxygen side gas-liquid separator

[0054] 31: Second inlet 32: Second liquid phase outlet

[0055] 33: Second gas phase outlet 34: Oxygen side pressure detection device

[0056] 132: Oxygen cooler 133: Oxygen side gas-water separator

[0057] 35: Fourth gas phase outlet 36: Fourth liquid phase outlet

[0058] 134: Oxygen side gas-water separation discharge valve 135: Oxygen side water collector

[0059] 136: Oxygen side pressure regulating valve 300: Oxygen output pipeline

[0060] 141: Cooling water flow regulating valve DETAILED DESCRIPTION

[0061] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0062] In order to fully understand the present invention, a detailed description will be provided in the following description. It should be understood that these embodiments are provided to make the disclosure of the present invention thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. Obviously, the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other embodiments.

[0063] Ordinal numbers such as "first" and "second" cited in the present invention are merely identifications and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term "first component" itself does not imply the existence of the "second component", and the term "second component" itself does not imply the existence of the "first component".

[0064] It should be noted that the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside" and similar expressions used in the present invention are for illustrative purposes only and are not limiting.

[0065] The invention discloses a hydrogen manufacturing system.

[0066] Now, exemplary embodiments according to the present invention will be described in more detail with reference to the accompanying drawings.

[0067] like Figure 1 , Figure 2 , Figure 3 As shown, in a preferred embodiment, a hydrogen production system includes: an AEM stack 111, a hydrogen-side gas-liquid separator 122, a gas-liquid separation discharge valve 121, a liquid level detection device 129 and a control module;

[0068] The AEM stack 111 is used for electrolyzing alkaline solution. The AEM stack 111 is provided with an AEM membrane for selectively transmitting anions (such as hydroxide ions OH-) while blocking the passage of cations, thereby achieving a highly selective and efficient electrochemical process. The alkaline solution can be a KOH solution. In the figure, the AEM stack 111 includes three interfaces, namely a hydrogen side outlet 11, a liquid inlet 13, and an oxygen side outlet 12;

[0069] The hydrogen-side gas-liquid separator 122 includes a first inlet 21 and a first liquid phase outlet 22, wherein the first inlet 21 is communicated with the hydrogen-side outlet 11 of the AEM stack 111, and the first liquid phase outlet 22 is communicated with the liquid inlet 13 of the AEM stack 111 through a reflux line 120; the hydrogen produced by the AEM stack 111 is output to the hydrogen-side gas-liquid separator 122, and the hydrogen also carries alkali liquid, and the hydrogen is separated into gas and liquid in the hydrogen-side gas-liquid separator 122, and the separated alkali liquid can be returned to the AEM stack 111 through the reflux line 120;

[0070] The gas-liquid separation discharge valve 121 is arranged at the first liquid phase outlet 22 of the hydrogen-side gas-liquid separator 122 or on the reflux pipeline 120 to control the on-off of the reflux pipeline 120;

[0071] The liquid level detection device 129 is used to detect the liquid level height in the hydrogen-side gas-liquid separator 122, that is, the height of the alkaline liquid separated from the gas and liquid;

[0072] The control module is electrically connected to the gas-liquid separation discharge valve 121 and the liquid level detection device 129 respectively, and the control module is used to receive the detection value signal of the liquid level detection device 129 and control the opening and closing of the gas-liquid separation discharge valve 121;

[0073] When the detection value of the liquid level detection device 129 exceeds the preset value, the control module controls the gas-liquid separation discharge valve 121 to open; when the detection value of the liquid level detection device 129 is lower than the preset value, the control module controls the gas-liquid separation discharge valve 121 to close.

[0074] The gas-liquid separation discharge valve 121 can automatically adjust the discharge liquid according to the liquid level in the hydrogen-side gas-liquid separator 122. When the level of the alkali liquid separated in the hydrogen-side gas-liquid separator 122 exceeds the preset height, the control module transmits an electrical signal to control the gas-liquid separation discharge valve 121 to open and discharge the alkali liquid in the hydrogen-side gas-liquid separator 122. When the liquid level is lower than the preset height, the control module transmits an electrical signal to control the gas-liquid separation discharge valve 121 to return to the normally closed state and stop discharging the alkali liquid in the hydrogen-side gas-liquid separator 122. In this process, the alkali liquid in the hydrogen-side gas-liquid separator 122 is discharged while avoiding the reflux of hydrogen caused by the reflux pipeline 120 being in the normally open state.

[0075] The hydrogen manufacturing system in this embodiment adds a gas-liquid separation discharge valve 121 between the hydrogen-side gas-liquid separator 122 and the AEM stack 111. Only when the alkaline liquid in the hydrogen-side gas-liquid separator 122 accumulates to a certain amount, the gas-liquid separation discharge valve 121 will be opened to achieve the reflux of the alkaline liquid. Due to the setting of the gas-liquid separation discharge valve 121, the first liquid phase outlet 22 of the hydrogen-side gas-liquid separator 122 and the liquid inlet 13 of the AEM stack 111 are not always in a connected state, which effectively prevents or reduces the hydrogen in the hydrogen-side gas-liquid separator 122 from flowing back to the AEM stack 111 along with the alkaline liquid, promotes the normal and orderly progress of the hydrogen production process, and reduces resource waste.

[0076] In one embodiment, if Figure 1 , Figure 2 As shown, the AEM stack 111 also includes an oxygen side outlet 12;

[0077] The hydrogen production system further includes an oxygen-side gas-liquid separator 131 , which includes a second inlet 31 and a second liquid phase outlet 32 ​​, and the second inlet 31 is connected to the oxygen-side outlet 12 of the AEM stack 111 ;

[0078] The hydrogen manufacturing system further includes a reflux branch 130, both ends of which are connected to the second liquid phase outlet 32 ​​of the oxygen-side gas-liquid separator 131 and the reflux pipeline 120 respectively;

[0079] The gas-liquid separation discharge valve 121 is disposed on the reflux pipeline 120 and is located between the connection point between the reflux branch 130 and the reflux pipeline 120 and the first liquid phase outlet 22 of the hydrogen-side gas-liquid separator 122 .

[0080] The oxygen produced by the AEM stack 111 is output to the oxygen side gas-liquid separator 131. The oxygen also carries alkaline liquid. The oxygen is separated into gas and liquid in the oxygen side gas-liquid separator 131. The separated alkaline liquid can be returned to the AEM stack 111 through the reflux branch 130 and the reflux pipeline 120. The gas-liquid separation discharge valve 121 does not affect the reflux of alkaline liquid from the oxygen side gas-liquid separator 131 to the AEM stack 111.

[0081] In one embodiment, if Figure 1 , Figure 2 , Figure 3 As shown, the hydrogen-side gas-liquid separator 122 also includes a first gas phase outlet 23;

[0082] The hydrogen manufacturing system also includes a hydrogen output pipeline 200, a hydrogen side pressure regulating valve 127 and a hydrogen side pressure detection device 24;

[0083] The hydrogen output pipeline 200 is connected to the first gas phase outlet 23, the hydrogen side pressure regulating valve 127 is arranged on the hydrogen output pipeline 200, and the hydrogen side pressure detection device 24 is used to detect the pressure in the hydrogen side gas-liquid separator 122;

[0084] The control module is electrically connected to the hydrogen side pressure regulating valve 127 and the hydrogen side pressure detection device 24 respectively. The control module is also used to receive the detection value signal of the hydrogen side pressure detection device 24 and control the opening degree of the hydrogen side pressure regulating valve 127.

[0085] The hydrogen side pressure regulating valve 127 is arranged on the hydrogen output pipeline 200 of the hydrogen side gas-liquid separator 122, and is used to control the flow of the hydrogen output pipeline 200 according to the pressure detected in the hydrogen side gas-liquid separator 122. The detection end of the hydrogen side pressure regulating valve 127 is connected to the hydrogen side pressure detection device 24, and is opened or closed by the pressure value in the hydrogen side gas-liquid separator 122. The electric signal generated by the hydrogen side pressure detection device 24 when detecting the pressure is transmitted to the control module, and the control module controls the hydrogen side pressure regulating valve 127 according to the detection signal, so as to realize the precise control of the hydrogen side gas pressure and automatically balance the system pressure.

[0086] In one embodiment, if Figure 1 , Figure 3 As shown, the AEM stack 111 also includes an oxygen side outlet 12;

[0087] The hydrogen production system further includes an oxygen-side gas-liquid separator 131 , which includes a second inlet 31 and a second gas phase outlet 33 , and the second inlet 31 is connected to the oxygen-side outlet 12 of the AEM stack 111 ;

[0088] The hydrogen production system also includes an oxygen output pipeline 300, an oxygen side pressure regulating valve 136 and an oxygen side pressure detection device 34;

[0089] The oxygen output pipeline 300 is connected to the second gas phase outlet 33 of the oxygen side gas-liquid separator 131, the oxygen side pressure regulating valve 136 is arranged on the oxygen output pipeline 300, and the oxygen side pressure detection device 34 is used to detect the pressure in the oxygen side gas-liquid separator 131;

[0090] The control module is electrically connected to the oxygen-side pressure regulating valve 136 and the oxygen-side pressure detecting device 34 , respectively. The control module is also used to receive the detection value signal of the oxygen-side pressure detecting device 34 and control the opening degree of the oxygen-side pressure regulating valve 136 .

[0091] The oxygen-side pressure regulating valve 136 is arranged on the oxygen output pipeline 300 of the oxygen-side gas-liquid separator 131, and is used to control the flow of the oxygen output pipeline 300 according to the pressure detected in the oxygen-side gas-liquid separator 131. The detection end of the oxygen-side pressure regulating valve 136 is connected to the oxygen-side pressure detecting device 34, and is opened or closed by the pressure value in the oxygen-side gas-liquid separator 131. The electric signal generated by the oxygen-side pressure detecting device 34 when detecting the pressure is transmitted to the control module, and the control module controls the oxygen-side pressure regulating valve 136 according to the detection signal, so as to automatically balance the system pressure.

[0092] By providing the hydrogen side pressure regulating valve 127 and the oxygen side pressure regulating valve 136, the pressures on both the hydrogen and oxygen sides can be controlled separately, thereby increasing the accuracy and reliability of the control.

[0093] In one embodiment, the hydrogen side pressure regulating valve 127 and / or the oxygen side pressure regulating valve 136 are PID regulating valves. The PID regulating valve is a high-precision control valve, and its working principle is: by measuring the actual output value of the system (such as flow, pressure, etc.), it is compared with the expected value to calculate the error value. Then, according to the error value, the PID controller will adjust the opening of the valve to reduce the error value. This adjustment process includes three parts: proportional, integral and differential, which correspond to the three parameters P, I and D of the controller respectively.

[0094] In one embodiment, if Figure 1 , Figure 2 As shown, the hydrogen production system further includes a hydrogen cooler 123 and a hydrogen-side gas-water separator 124;

[0095] The inlet of the hydrogen cooler 123 is connected to the first gas phase outlet 23 of the hydrogen side gas-liquid separator 122 , the outlet of the hydrogen cooler 123 is connected to the inlet of the hydrogen side gas-water separator 124 , and the third gas phase outlet 25 of the hydrogen side gas-water separator 124 is connected to the hydrogen output pipeline 200 .

[0096] The hydrogen separated by the hydrogen-side gas-liquid separator 122 is input to the hydrogen-side gas-water separator 124 for further gas-liquid separation, and this time the separated gas is mainly water.

[0097] The hydrogen cooler 123 includes four interfaces, the first interface and the second interface are connected to the cooling system respectively, the third interface is connected to the hydrogen side gas-liquid separator 122 , and the fourth interface is connected to the hydrogen side gas-water separator 124 .

[0098] Cooling water is input from the first interface of the hydrogen cooler 123, and is output from the second interface after heat exchange with hydrogen in the hydrogen cooler 123, and flows back to the cooling system. The hydrogen is cooled by the cooler, which can reduce the solubility of gaseous water in the hydrogen and precipitate some water, and then separated by the hydrogen-side gas-water separator 124.

[0099] In one embodiment, if Figure 1 , Figure 2 As shown, the hydrogen production system further includes a hydrogen side water collector 126 and a gas-water separation discharge valve 125;

[0100] The inlet of the hydrogen-side water collector 126 is in communication with the third liquid phase outlet 26 of the hydrogen-side gas-water separator 124;

[0101] The gas-water separation discharge valve 125 is disposed on the communication pipeline between the hydrogen-side gas-water separator 124 and the hydrogen-side water collector 126 .

[0102] The input port of the gas-water separation discharge valve 125 is connected to the hydrogen-side gas-water separator 124, and the liquid separated from the hydrogen in the hydrogen-side gas-water separator 124 is output through the gas-water separation discharge valve 125, and the liquid is mainly water;

[0103] The hydrogen-side water collector 126 is connected to the output port of the gas-water separation discharge valve 125 and is used to collect the liquid separated from the gas and liquid in the hydrogen-side gas-water separator 124 .

[0104] By adding a gas-water separation discharge valve on the hydrogen side, the discharge of water in the gas-liquid separation on the hydrogen side can be controlled to prevent water from being discharged with the hydrogen and improve the dryness of the hydrogen.

[0105] In one embodiment, if Figure 1 , Figure 2 As shown, the hydrogen production system also includes:

[0106] The hydrogen side vent valve 128 is arranged on the hydrogen output pipeline 200. Along the gas flow path in the hydrogen output pipeline 200, the hydrogen side vent valve 128 is located downstream of the hydrogen side pressure regulating valve 127. The hydrogen side vent valve 128 is used to control the opening and closing of the outlet end of the hydrogen output pipeline 200.

[0107] The hydrogen-side vent valve 128 may also be connected to a purification system, which is used to further improve the purity of the hydrogen.

[0108] In one embodiment, if Figure 1As shown, the hydrogen production system further includes an oxygen cooler 132 and an oxygen-side gas-water separator 133;

[0109] The inlet of the oxygen cooler 132 is connected to the second gas phase outlet 33 of the oxygen side gas-liquid separator 131 , the outlet of the oxygen cooler 132 is connected to the inlet of the oxygen side gas-water separator 133 , and the fourth gas phase outlet 35 of the oxygen side gas-water separator 133 is connected to the oxygen output pipeline 300 .

[0110] The oxygen separated by the oxygen-side gas-liquid separator 131 is input into the oxygen-side gas-water separator 133 for further gas-liquid separation, and the oxygen separated this time is mainly water.

[0111] The oxygen cooler 132 includes four interfaces, the first interface and the second interface are connected to the cooling system respectively, the third interface is connected to the oxygen-side gas-liquid separator 131 , and the fourth interface is connected to the oxygen-side gas-water separator 133 .

[0112] Cooling water is input from the first interface of the oxygen cooler 132, and is output from the second interface after heat exchange with oxygen in the oxygen cooler 132, and flows back to the cooling system. The oxygen is cooled by the cooler, which can reduce the solubility of gaseous water in the oxygen and precipitate some water, and then separated by the oxygen-side gas-water separator 133.

[0113] In one embodiment, if Figure 1 As shown, the hydrogen production system further includes an oxygen side water collector 135 and an oxygen side gas-water separation discharge valve 134;

[0114] The inlet of the oxygen-side water collector 135 is connected to the fourth liquid phase outlet 36 of the oxygen-side gas-water separator 133;

[0115] The oxygen-side gas-water separation discharge valve 134 is disposed on the communication pipeline between the oxygen-side gas-water separator 133 and the oxygen-side water collector 135 .

[0116] The input port of the oxygen side gas-water separation discharge valve 134 is connected to the oxygen side gas-water separator 133, and the liquid separated from the oxygen in the oxygen side gas-water separator 133 is output through the oxygen side gas-water separation discharge valve 134, and the liquid is mainly water;

[0117] The oxygen-side water collector 135 is connected to the output port of the oxygen-side gas-water separation discharge valve 134 and is used to collect the liquid separated from the gas and liquid in the oxygen-side gas-water separator 133 .

[0118] By adding a gas-water separation discharge valve on the oxygen side, the discharge of water in the gas-liquid separation on the oxygen side can be controlled to prevent water from being discharged with the oxygen, thereby improving the dryness of the oxygen.

[0119] In one embodiment, if Figure 1 As shown, the hydrogen production system also includes:

[0120] The heater 114 has an input port connected to the alkali liquid tank, an output port connected to the AEM stack 111, and can be connected to the liquid inlet 13 of the AEM stack 111, and is used to heat the alkali liquid transported to the AEM stack 111 so that the temperature of the alkali liquid meets the requirements of the hydrogen production process. The alkali liquid tank stores alkali liquid, such as KOH solution.

[0121] Since the AEM stack 111 has strict requirements on the electrolyte temperature when working, a heater 114 is added to the alkali solution loop, and cooperates with the heat exchanger 113 in the loop to achieve precise control of the temperature of the alkali solution entering the AEM stack 111.

[0122] In one embodiment, if Figure 1 As shown, the hydrogen production system also includes:

[0123] The heat exchanger 113 includes four interfaces, the first interface and the second interface are connected to the cooling system respectively, the third interface is connected to the return pipeline 120, and the fourth interface is connected to the heater 114.

[0124] The temperature of the liquid refluxed from the oxygen side gas-liquid separator 131 and the hydrogen side gas-liquid separator 122 is still relatively high, and needs to be cooled by heat exchanger 113 before it can flow back to the AEM stack 111. A lye circulation pump 112 is provided on the pipeline connected to the third interface, and the lye circulation pump 112 can promote the smooth circulation of lye.

[0125] The cooling water is input from the first interface of the heat exchanger 113, and is output from the second interface after exchanging heat with the alkali solution in the heat exchanger 113, and flows back to the cooling system.

[0126] A cooling water flow regulating valve 141 is arranged on the pipeline of the first interface of the cooling system connected to the heat exchanger 113. The detection end of the cooling water flow regulating valve 141 is connected to the fourth interface of the heat exchanger 113. A temperature detection device is arranged at the fourth interface. The cooling water flow regulating valve 141 and the temperature detection device are also connected to the control module. The opening or closing is controlled by the temperature value of the output pipeline of the fourth interface. It is an automatic control and can automatically adjust the flow of cooling water according to the temperature of the liquid refluxed from the oxygen side gas-liquid separator 131 and the hydrogen side gas-liquid separator 122.

[0127] In one embodiment, if Figure 1 As shown, the oxygen-side gas-liquid separator 131 and the hydrogen-side gas-liquid separator 122 are also connected to a nitrogen supply system, which is used to fill nitrogen into the oxygen-side gas-liquid separator 131 and the hydrogen-side gas-liquid separator 122, thereby improving the safety of the system. The hydrogen production system needs to be filled with nitrogen before starting up in order to displace other gases in the system and discharge nitrogen through the exhaust valve to ensure the cleanliness and safety of the system. Nitrogen filling can also be used to test the system's air tightness and find the source of leakage.

[0128] In one embodiment, if Figure 1 As shown, the oxygen-side gas-liquid separator 131 is also connected to a water replenishment system, which is used to replenish water to the oxygen-side gas-liquid separator 131 to balance the pressure in the oxygen-side gas-liquid separator 131 .

[0129] According to the hydrogen manufacturing system of the present invention, a gas-liquid separation discharge valve is added between the hydrogen-side gas-liquid separator and the AEM fuel cell stack. Only when the alkaline liquid in the hydrogen-side gas-liquid separator accumulates to a certain amount, the gas-liquid separation discharge valve will be opened to realize the reflux of the alkaline liquid. Due to the setting of the gas-liquid separation discharge valve, the first liquid phase outlet of the hydrogen-side gas-liquid separator and the liquid inlet of the AEM fuel cell stack are not always in a connected state, which effectively prevents or reduces the hydrogen in the hydrogen-side gas-liquid separator from flowing back to the AEM fuel cell stack along with the alkaline liquid, promotes the normal and orderly progress of the hydrogen production process, and reduces resource waste.

[0130] The present invention realizes high efficiency and accuracy in hydrogen preparation of the AEM fuel cell stack, increases production efficiency, and makes the production process more accurate and reliable.

[0131] The processes and steps described in all the above preferred embodiments are only examples. Unless adverse effects occur, various processing operations can be performed in a sequence different from the sequence of the above processes. The sequence of steps in the above processes can also be increased, merged or deleted according to actual needs.

[0132] In understanding the scope of the present invention, the term "comprise" and its derivatives as used herein are intended to be open terms, which specify the existence of recorded features, elements, components, groups, wholes and / or steps, but do not exclude the existence of other unrecorded features, elements, components, groups, wholes and / or steps. This concept also applies to words with similar meanings, such as the terms "include", "have" and their derivatives.

[0133] The terms "attached" or "attached" as used herein include: a configuration where an element is directly secured to another element by directly securing the element to the other element; a configuration where an element is indirectly secured to another element by securing the element to an intermediate member which in turn is secured to the other element; and a configuration where one element is integral with the other element, i.e., one element is substantially a part of the other element. This definition also applies to words with similar meanings such as "connect," "connect," "couple," "mount," "bond," "fix," and their derivatives. Finally, terms of degree such as "substantially," "approximately," and "approximately" as used herein represent the amount of deviation that modifies the term such that the end result will not be significantly changed.

[0134] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein are only for describing specific implementation purposes and are not intended to limit the present invention. The features described herein in one embodiment may be applied to another embodiment individually or in combination with other features, unless the feature is not applicable or otherwise specified in the other embodiment.

[0135] The present invention has been described through the above-mentioned embodiments, but it should be understood that the above-mentioned embodiments are only for the purpose of example and description, and are not intended to limit the present invention to the described embodiments. In addition, it can be understood by those skilled in the art that the present invention is not limited to the above-mentioned embodiments, and more variations and modifications can be made according to the teachings of the present invention, and these variations and modifications all fall within the scope of the protection claimed by the present invention.

Claims

1. A hydrogen production system, characterized in that: include: An AEM stack (111), wherein the AEM stack (111) comprises a hydrogen side outlet (11) and a liquid inlet (13); A hydrogen-side gas-liquid separator (122), the hydrogen-side gas-liquid separator (122) comprising a first inlet (21) and a first liquid phase outlet (22), wherein the first inlet (21) is in communication with the hydrogen-side outlet (11), and the first liquid phase outlet (22) is in communication with the liquid inlet (13) via a reflux pipeline (120); a gas-liquid separation discharge valve (121), the gas-liquid separation discharge valve (121) being arranged at the first liquid phase outlet (22) or on the reflux pipeline (120); A liquid level detection device (129), the liquid level detection device (129) being used to detect the liquid level height in the hydrogen-side gas-liquid separator (122); a control module, the control module being electrically connected to the gas-liquid separation discharge valve (121) and the liquid level detection device (129) respectively, the control module being used to receive a detection value signal from the liquid level detection device (129) and to control the opening and closing of the gas-liquid separation discharge valve (121); When the detection value of the liquid level detection device (129) exceeds a preset value, the control module controls the gas-liquid separation discharge valve (121) to open; when the detection value of the liquid level detection device (129) is lower than the preset value, the control module controls the gas-liquid separation discharge valve (121) to close.

2. The hydrogen production system according to claim 1, characterized in that: The AEM stack (111) further comprises an oxygen side outlet (12); The hydrogen production system further comprises an oxygen-side gas-liquid separator (131), wherein the oxygen-side gas-liquid separator (131) comprises a second inlet (31) and a second liquid phase outlet (32), wherein the second inlet (31) is in communication with the oxygen-side outlet (12); The hydrogen production system further comprises a reflux branch (130), wherein two ends of the reflux branch (130) are respectively connected to the second liquid phase outlet (32) and the reflux pipeline (120); The gas-liquid separation discharge valve (121) is arranged on the reflux pipeline (120) and is located between the connection point between the reflux branch (130) and the reflux pipeline (120) and the first liquid phase outlet (22).

3. The hydrogen production system according to claim 1, characterized in that: The hydrogen-side gas-liquid separator (122) further includes a first gas phase outlet (23); The hydrogen production system further comprises a hydrogen output pipeline (200), a hydrogen side pressure regulating valve (127) and a hydrogen side pressure detection device (24); The hydrogen output pipeline (200) is in communication with the first gas phase outlet (23), the hydrogen side pressure regulating valve (127) is arranged on the hydrogen output pipeline (200), and the hydrogen side pressure detection device (24) is used to detect the pressure in the hydrogen side gas-liquid separator (122); The control module is electrically connected to the hydrogen side pressure regulating valve (127) and the hydrogen side pressure detection device (24) respectively, and the control module is also used to receive the detection value signal of the hydrogen side pressure detection device (24) and control the opening degree of the hydrogen side pressure regulating valve (127).

4. The hydrogen production system according to claim 3, characterized in that: The AEM stack (111) further comprises an oxygen side outlet (12); The hydrogen production system further comprises an oxygen-side gas-liquid separator (131), wherein the oxygen-side gas-liquid separator (131) comprises a second inlet (31) and a second gas phase outlet (33), wherein the second inlet (31) is in communication with the oxygen-side outlet (12); The hydrogen production system also includes an oxygen output pipeline (300), an oxygen side pressure regulating valve (136) and an oxygen side pressure detection device (34); The oxygen output pipeline (300) is in communication with the second gas phase outlet (33), the oxygen side pressure regulating valve (136) is arranged on the oxygen output pipeline (300), and the oxygen side pressure detection device (34) is used to detect the pressure in the oxygen side gas-liquid separator (131); The control module is electrically connected to the oxygen side pressure regulating valve (136) and the oxygen side pressure detection device (34) respectively, and the control module is also used to receive the detection value signal of the oxygen side pressure detection device (34) and control the opening degree of the oxygen side pressure regulating valve (136).

5. The hydrogen production system according to claim 4, characterized in that: The hydrogen side pressure regulating valve (127) and / or the oxygen side pressure regulating valve (136) are PID regulating valves.

6. The hydrogen production system according to claim 3, characterized in that: The hydrogen production system also includes a hydrogen cooler (123) and a hydrogen-side gas-water separator (124); The inlet of the hydrogen cooler (123) is connected to the first gas phase outlet (23), the outlet of the hydrogen cooler (123) is connected to the inlet of the hydrogen side gas-water separator (124), and the third gas phase outlet (25) of the hydrogen side gas-water separator (124) is connected to the hydrogen output pipeline (200).

7. The hydrogen production system according to claim 6, characterized in that: The hydrogen production system further comprises a hydrogen side water collector (126) and a gas-water separation discharge valve (125); The inlet of the hydrogen-side water collector (126) is in communication with the third liquid phase outlet (26) of the hydrogen-side gas-water separator (124); The gas-water separation discharge valve (125) is arranged on the communication pipeline between the hydrogen-side gas-water separator (124) and the hydrogen-side water collector (126).

8. The hydrogen production system according to claim 3, characterized in that: The hydrogen manufacturing system further comprises a hydrogen side vent valve (128), which is arranged on the hydrogen output pipeline (200). Along the gas flow path in the hydrogen output pipeline (200), the hydrogen side vent valve (128) is located downstream of the hydrogen side pressure regulating valve (127), and the hydrogen side vent valve (128) is used to control the opening and closing of the outlet end of the hydrogen output pipeline (200).

9. The hydrogen production system according to claim 1 or 2, characterized in that: The hydrogen production system further includes: a heat exchanger (113) and a heater (114); The inlet of the heat exchanger (113) is in communication with the reflux pipeline (120), the outlet of the heat exchanger (113) is in communication with the inlet of the heater (114), and the outlet of the heater (114) is in communication with the liquid inlet (13) of the AEM stack (111).

10. The hydrogen production system according to claim 9, characterized in that: The hydrogen production system further comprises a lye tank, which is connected to the inlet of the heater (114).

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