Water electrolysis hydrogen production system

Abstract

The invention discloses a water electrolysis hydrogen production system, and relates to the technical field of water electrolysis hydrogen production. The water electrolysis hydrogen production system comprises an electrolytic bath, a gas-liquid separator, a gas treatment system and a thermal management system, the gas treatment system comprises a first cooling device, a purification device and a second cooling device which are arranged in sequence; coolants are arranged in the first cooling device and the second cooling device, and heat exchange is carried out through the coolants and the gas, so that the gas is cooled, and the coolants are heated. And the thermal management system is used for receiving the heated coolant in the first cooling device and the second cooling device and cooling the heated coolant, and then conveying the cooled coolant to the first cooling device and the second cooling device again. According to the technical scheme provided by the invention, on the premise of ensuring the cooling efficiency, the comprehensive energy consumption of water electrolysis hydrogen production can be reduced, so that the water electrolysis hydrogen production conforms to the energy-saving and environment-friendly production concept.

Description

Technical Field

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

[0002] Water electrolysis hydrogen production technology can decompose the raw water into hydrogen and oxygen. The hydrogen obtained can be used as fuel or chemical raw material. Producing hydrogen with renewable energy electricity can produce zero-carbon emission "green hydrogen", which is an important method of obtaining low-carbon energy.

[0003] In the process of producing hydrogen by water electrolysis, the raw water in the electrolyzer is decomposed into hydrogen and oxygen under the action of electrolysis. Hydrogen and oxygen enter the gas-liquid separator mixed with electrolyte. After gas-liquid separation, the electrolyte returns to the electrolyzer to continue to serve as raw water, and the gas is transported to the gas treatment system. Since a certain overvoltage is required in the process of electrolysis of raw water in the electrolyzer, the overvoltage will cause a large amount of waste heat to be generated in the process of water electrolysis, so that the temperature of the generated hydrogen / oxygen is relatively high; at the same time, since hydrogen / oxygen contains a small amount of oxygen / hydrogen, hydrogen and oxygen need to be purified; and in the purification process, hydrogen / oxygen reacts with the small amount of oxygen / hydrogen contained therein to release heat. In the prior art, water cooling or air cooling is usually used to cool the gas; since the air cooling method has a low cooling efficiency, and the water cooling method needs to consume coolant during the cooling process, thereby increasing the comprehensive energy consumption of water electrolysis hydrogen production, which does not conform to the production concept of energy conservation and environmental protection.

[0004] It should be noted that the above contents are only used to assist in understanding the technical solution of the present invention, and do not constitute an admission that the above contents are prior art. Summary of the invention

[0005] The main purpose of the present invention is to propose a water electrolysis hydrogen production system, which aims to reduce the comprehensive energy consumption of water electrolysis hydrogen production under the premise of ensuring cooling efficiency, so as to make it conform to the production concept of energy saving and environmental protection.

[0006] To achieve the above object, the present invention provides a water electrolysis hydrogen production system, which includes an electrolyzer, a gas-liquid separator, a gas treatment system and a thermal management system; The gas-liquid separator is used to perform gas-liquid separation processing on the gas-liquid mixture formed by electrolysis of raw water in the electrolytic cell to form gas, wherein the gas is transported to the gas processing system; The gas processing system comprises a first cooling device, a purification device and a second cooling device which are arranged in sequence; wherein the first cooling device and the second cooling device are both provided with a coolant, and heat exchange is performed between the coolant and the gas so that the gas is cooled and the coolant is heated; The thermal management system is used to receive the heated coolant in the first cooling device and the second cooling device and cool it down, and then re-transport the cooled coolant to the first cooling device and the second cooling device.

[0007] In one embodiment, the thermal management system includes an evaporative condensation device, which includes a condenser and at least two evaporation pools. The condenser is sequentially arranged in the evaporation pools at each level, and the inlet end of the condenser is connected to the coolant outlet end of the first cooling device or the second cooling device, and the outlet end of the condenser is connected to the coolant inlet end of the first cooling device or the second cooling device; each level of the evaporation pool is filled with cooling water, and heat exchange is performed between the cooling water and the coolant in the condenser, so that the coolant is cooled and the cooling water is heated.

[0008] In one embodiment, the pipe section of the condenser pipe located in the evaporation pool is distributed in a serpentine shape.

[0009] In one embodiment, a connecting pipe is provided between adjacent evaporation pools, and a first one-way valve is installed on the connecting pipe, wherein the conduction direction of the first one-way valve points to the evaporation pool of the upper level; the evaporation pool at the lowest level is connected to a water injection port, and the water injection port is used to inject the cooling water into the evaporation pool.

[0010] In one embodiment, a gas collecting pipe is provided in each stage of the evaporation pool, and the gas collecting pipe is used to collect steam formed by evaporation of the heated cooling water; the gas collecting pipe is sequentially arranged in the evaporation pools of each stage; when the steam moves along the gas collecting pipe to the evaporation pool of the next stage, the cooling water with a relatively low temperature in the evaporation pool of the next stage performs heat exchange with the steam in the gas collecting pipe, so that the steam is cooled and condensed to form liquid water; the outlet end of the gas collecting pipe is connected to the evaporation pool of the lowest stage or the electrolytic cell.

[0011] In one embodiment, A compression device is provided at the coolant inlet end of the evaporative condensation device, and the compression device is used to compress the coolant; And / or, a coolant outlet end of the evaporative condensation device is provided with an insulating tank, and the insulating tank is used to store the cooled coolant.

[0012] In one embodiment, a first flow control valve is arranged between the insulated tank and the first cooling device, a first temperature detector is arranged at the gas outlet end of the first cooling device, and the first temperature detector is electrically connected to the first flow control valve; and / or, a second flow control valve is arranged between the insulated tank and the second cooling device, a second temperature detector is arranged at the gas outlet end of the second cooling device, and the second temperature detector is electrically connected to the second flow control valve.

[0013] In one embodiment, the gas processing system includes a preheating device, and the preheating device is used to heat the gas to increase the temperature; A preheating pipe and a heat flow pipe are arranged inside the preheating device, the inlet end of the preheating pipe is connected to the gas outlet end of the first cooling device, and the outlet end of the preheating pipe is connected to the purification inlet end of the purification device; the heat flow inlet end of the heat flow pipe is connected to the purification outlet end of the purification device, and the heat flow outlet end of the heat flow pipe is connected to the gas inlet end of the second cooling device; the preheating pipe and the gas inside the heat flow pipe can exchange heat with each other, so that the gas inside the preheating pipe is heated up and the gas inside the heat flow pipe is cooled down.

[0014] In one embodiment, a third flow control valve is provided between the purification outlet end of the purification device and the heat flow inlet end of the heat flow pipeline; The gas processing system further comprises a bypass pipeline, the inlet end of the bypass pipeline is arranged between the purification outlet end of the purification device and the third flow control valve, and the outlet end of the bypass pipeline is arranged between the heat flow outlet end of the heat flow pipeline and the gas inlet end of the second cooling device; a fourth flow control valve is arranged on the bypass pipeline; The purification device is provided with a third temperature detector, and the third temperature detector is electrically connected to the third flow control valve and the fourth flow control valve.

[0015] In one embodiment, the gas processing system includes a first gas-water separation device and a second gas-water separation device, wherein the first gas-water separation device is arranged between the first cooling device and the purification device; and the second gas-water separation device is arranged at the gas outlet end of the second cooling device.

[0016] In one embodiment, the gas processing system further comprises a drying device, and the drying device is disposed on a side of the second gas-water separation device away from the second cooling device.

[0017] The technical solution of the present invention is to set a first cooling device to cool down the gas after gas-liquid separation in the gas-liquid separator, and set a second cooling device to cool down the gas after purification in the purification device, so as to avoid the temperature of the gas being too high. At the same time, the heat management system is used to receive the heated coolant in the first cooling device and the second cooling device and cool it down, and then the cooled coolant is re-transported to the first cooling device and the second cooling device so that it can continue to cool down the gas. The pipeline between the first cooling device and the heat management system constitutes a first cooling circulation pipeline, and the pipeline between the second cooling device and the heat management system constitutes a second cooling circulation pipeline.

[0018] The above process mainly utilizes the coolant to cool the gas in a water-cooling manner through the heat exchange principle, thereby ensuring the cooling efficiency of the gas; and through the first cooling circulation pipeline and the second cooling circulation pipeline, the coolant can be reused, thereby reducing the demand for coolant, thereby reducing the comprehensive energy consumption of water electrolysis hydrogen production, which is in line with the production concept of energy conservation and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 A schematic diagram of the overall structure of an embodiment of a water electrolysis hydrogen production system provided by the present invention; Figure 2 A schematic diagram of the structure of a gas treatment system and a thermal management system in an embodiment of a water electrolysis hydrogen production system provided by the present invention; Figure 3 This is a schematic diagram of the structure of the evaporation and condensation device in one embodiment of the water electrolysis hydrogen production system provided by the present invention.

[0021] Description of reference numerals: 100, electrolytic cell; 200, gas-liquid separator; 300, gas treatment system; 310, first cooling device; 311, first temperature detector; 320, purification device; 321, third flow control valve; 322, bypass pipe; 323, fourth flow control valve; 324, third temperature detector; 330, second cooling device; 331, second temperature detector; 340, preheating device; 350, first gas-water separation device; 360, second Gas-water separation device; 370, drying device; 400, thermal management system; 410, evaporation-condensation device; 411, condenser; 412, evaporation pool; 413, connecting pipe; 414, first one-way valve; 415, water injection port; 416, gas collecting pipe; 420, compression device; 421, second one-way valve; 422, third one-way valve; 423, fourth one-way valve; 430, insulation tank; 431, first flow control valve; 432, second flow control valve; The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0022] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solution in the present invention. Obviously, what is described is only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0024] In addition, it should be noted that the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0025] In the prior art, water cooling or air cooling is usually used to cool the gas; since the air cooling method has a low cooling efficiency, and the water cooling method requires the consumption of coolant during the cooling process, the comprehensive energy consumption of water electrolysis hydrogen production is increased, which is not in line with the production concept of energy conservation and environmental protection.

[0026] In order to solve the above technical problems, the present invention proposes a water electrolysis hydrogen production system.

[0027] See also Figure 1-2 In one embodiment of the present invention, the water electrolysis hydrogen production system includes an electrolyzer 100, a gas-liquid separator 200, a gas processing system 300 and a thermal management system 400; The gas-liquid separator 200 is used to perform gas-liquid separation on the gas-liquid mixture formed by electrolysis of the raw water in the electrolytic cell 100 to form gas and electrolyte, wherein the electrolyte is returned to the electrolytic cell 100 and the gas is transported to the gas treatment system 300; The gas processing system 300 includes a first cooling device 310, a purification device 320 and a second cooling device 330 which are arranged in sequence; wherein a coolant (not shown in the drawings) is arranged in both the first cooling device 310 and the second cooling device 330, and the coolant exchanges heat with the gas to cool the gas and heat the coolant; The thermal management system 400 is used to receive the heated coolant in the first cooling device 310 and the second cooling device 330 and cool it down, and then transport the cooled coolant back to the first cooling device 310 and the second cooling device 330 .

[0028] The technical solution of the present invention is to set a first cooling device 310 to cool down the gas after gas-liquid separation in the gas-liquid separator 200, and set a second cooling device 330 to cool down the gas after purification in the purification device 320, so as to avoid excessive temperature of the gas. At the same time, the heat management system 400 is used to receive the heated coolant in the first cooling device 310 and the second cooling device 330 and cool it down, and then the cooled coolant is re-transported to the first cooling device 310 and the second cooling device 330 so that it can continue to cool down the gas. The pipeline between the first cooling device 310 and the heat management system 400 constitutes a first cooling circulation pipeline, and the pipeline between the second cooling device 330 and the heat management system 400 constitutes a second cooling circulation pipeline.

[0029] The above process mainly utilizes the coolant to cool the gas in a water-cooling manner through the heat exchange principle, thereby ensuring the cooling efficiency of the gas; and through the first cooling circulation pipeline and the second cooling circulation pipeline, the coolant can be reused, thereby reducing the demand for coolant, thereby reducing the comprehensive energy consumption of water electrolysis hydrogen production, which is in line with the production concept of energy conservation and environmental protection.

[0030] There are many specific structures of the thermal management system 400. Figure 2-3 The thermal management system 400 includes an evaporative condensation device 410, which includes a condenser 411 and at least two evaporation pools 412. The condenser 411 is sequentially arranged in each evaporation pool 412, and the inlet end of the condenser 411 is connected to the coolant outlet end of the first cooling device 310 or the second cooling device 330, and the outlet end of the condenser 411 is connected to the coolant inlet end of the first cooling device 310 or the second cooling device 330; each evaporation pool 412 is filled with cooling water (not shown in the drawings), and the cooling water is heat-exchanged with the coolant in the condenser 411 to cool the coolant and heat the cooling water. In this way, the coolant flows through the evaporation pools 412 at each level through the condenser 411. Since each evaporation pool 412 is filled with cooling water, the temperature of the cooling water is relatively low compared to the heated coolant; so that the cooling water and the coolant in the condenser 411 are heat-exchanged to cool the coolant and heat the cooling water, thereby achieving the purpose of cooling the coolant. Furthermore, since the multi-stage evaporation pool 412 is provided to perform multi-stage cooling on the coolant, it is avoided that the cooling water temperature in the single-stage evaporation pool 412 continues to increase with continuous operation, thereby preventing the subsequent cooling efficiency of the coolant from being affected.

[0031] In this embodiment, the evaporation pool 412 is designed as a three-level structure; it should be noted that after understanding the technical solution of the present application, those skilled in the art can think of evaporation pools 412 of other orders of magnitude without any creative work, and they should also fall within the protection scope of the present application.

[0032] Furthermore, the pipe sections of the condenser pipe 411 in the evaporation pool 412 are distributed in a serpentine shape. In this way, the serpentine shape is distributed to extend the residence length of the condenser pipe 411 in each stage of the evaporation pool 412, thereby extending the residence time of the coolant in each stage of the evaporation pool 412, so as to ensure sufficient heat exchange time between the coolant and the cooling water.

[0033] As a preferred solution of the above embodiment, refer to the attached Figure 3A connecting pipe 413 is provided between adjacent evaporation pools 412, and a first one-way valve 414 is installed on the connecting pipe 413. The conduction direction of the first one-way valve 414 points to the upper-level evaporation pool 412; the evaporation pool 412 at the lowest level is connected to a water injection port 415, and the water injection port 415 is used to inject cooling water into the evaporation pool 412. With such arrangement, as the cooling operation of the coolant is carried out by the evaporation pools 412 at each level, the temperature of the cooling water in the evaporation pools 412 at each level gradually decreases from the upper level to the lower level; in order to ensure that the temperature of the cooling water in each evaporation pool 412 meets the requirements for heat exchange of the coolant, the present embodiment is provided with a connecting pipe 413 with a first one-way valve 414 installed between each evaporation pool 412, and since the conduction direction of the first one-way valve 414 points to the upper evaporation pool 412, the cooling water of the lower evaporation pool 412 can flow to the upper evaporation pool 412 and mix with its cooling water, thereby reducing the overall temperature of the cooling water in the upper evaporation pool 412, so that it meets the requirements for heat exchange of the coolant. At the same time, considering that during the heat exchange between the coolant and the cooling water, a part of the cooling water heats up and evaporates, so that the total amount of cooling water in the evaporation pool 412 is reduced; therefore, a water injection port 415 is provided to inject cooling water therein to supplement it, so as to ensure that the total amount of cooling water in the evaporation pool 412 is maintained at a certain level.

[0034] Furthermore, a gas collecting pipe 416 is provided in each stage of the evaporation pool 412, and the gas collecting pipe 416 is used to collect steam formed by evaporation of the heated cooling water; the gas collecting pipe 416 is sequentially arranged in each stage of the evaporation pool 412; when the steam moves along the gas collecting pipe 416 to the next stage of the evaporation pool 412, the relatively low temperature cooling water in the next stage of the evaporation pool 412 performs heat exchange with the steam in the gas collecting pipe 416, so that the steam is cooled and condensed to form liquid water; the outlet end of the gas collecting pipe 416 is connected to the lowest stage of the evaporation pool 412 or the electrolytic cell 100. In this arrangement, the steam formed by the evaporation of the heated cooling water is collected by the gas collecting pipe 416, and then it flows through each stage of the evaporation pool 412 in sequence. Since the temperature of the cooling water in the lower stage of the evaporation pool 412 is lower than the temperature of the steam in the gas collecting pipe 416, the cooling water and the steam perform heat exchange, so that the steam is cooled and condensed to become liquid water again. After being converted back into liquid water, since its temperature is close to the cooling water temperature of the lowest evaporation pool 412, it can be discharged back into the lowest evaporation pool 412 for reuse as cooling water; or the outlet end of the gas collecting pipe 416 can be connected to the electrolyzer 100 to transport the liquid water to the electrolyzer 100 for reuse as raw water. The above structure can reduce the demand for cooling water or raw water, and can also be regarded as a means to reduce the comprehensive energy consumption of water electrolysis hydrogen production.

[0035] Among them, the above-mentioned cooling water can also use high-salt wastewater from chemical, coal mines, and power plants. In the process of high-salt wastewater evaporating to form steam and then cooling down and condensing back into liquid water, it is equivalent to concentrating the high-salt wastewater and obtaining distilled water at the same time; thus, it is more conducive to energy conservation and environmental protection.

[0036] As a preferred solution of the above embodiment, refer to the attached Figure 2 The coolant inlet of the evaporative condensation device 410 is provided with a compression device 420, and the compression device 420 is used to compress the coolant. With such a configuration, before the coolant enters the evaporative condensation device 410, the coolant is first compressed by the compression device 420 to further heat the coolant. This is because the total energy of the coolant remains unchanged, and the internal energy between its molecules is converted into thermal energy. Since the molecules release heat after the coolant is compressed, the potential energy of the molecules is converted into heat and dissipated, thereby reducing the molecular potential energy. After being subsequently cooled by the evaporative condensation device 410, the total energy of the coolant is reduced, and at the same time, the pressure on the coolant is reduced and it expands, the energy between molecules increases, and the temperature decreases. That is to say, during compression, the potential energy between molecules is converted into thermal energy, and the apparent temperature increases. During expansion, the thermal energy is converted into the potential energy between molecules, and the apparent temperature decreases. This further improves the cooling effect of the coolant.

[0037] Further, a second one-way valve 421 is provided between the first cooling device 310 and the compression device 420, and the conduction direction of the second one-way valve 421 points to the compression device 420; and / or, a third one-way valve 422 is provided between the second cooling device 330 and the compression device 420, and the conduction direction of the third one-way valve 422 points to the compression device 420; and / or, a fourth one-way valve 423 is provided between the compression device 420 and the evaporative condensation device 410, and the conduction direction of the fourth one-way valve 423 points to the evaporative condensation device 410. Such a configuration ensures that the gas is transported in a preset direction under the guidance of the second one-way valve 421, the third one-way valve 422 and the fourth one-way valve 423, and avoids the gas from flowing back in the thermal management system 400.

[0038] As a preferred solution of the above embodiment, refer to the attached Figure 2 The coolant outlet of the evaporative condensation device 410 is provided with an insulated tank 430, which is used to store the cooled coolant. In this way, the insulated tank 430 is used to store the cooled coolant and keep it at a stable temperature so that its temperature meets the preset temperature requirement when used.

[0039] Furthermore, a first flow control valve 431 is arranged between the insulation tank 430 and the first cooling device 310, and a first temperature detector 311 is arranged at the gas outlet end of the first cooling device 310, and the first temperature detector 311 is electrically connected to the first flow control valve 431; with such arrangement, when the detection value measured by the first temperature detector 311 is too high, it means that the cooling effect of the first cooling device 310 on the gas is not ideal, and the first cooling device 310 needs to be supplemented with coolant; at this time, the first flow control valve 431 is started to supplement the coolant in the insulation tank 430 into the first cooling device 310 until the detection value measured by the first temperature detector 311 reaches the expected range.

[0040] And / or, a second flow control valve 432 is provided between the insulation tank 430 and the second cooling device 330, a second temperature detector 331 is provided at the gas outlet of the second cooling device 330, and the second temperature detector 331 is electrically connected to the second flow control valve 432. In this arrangement, when the detection value measured by the second temperature detector 331 is too high, it means that the cooling effect of the second cooling device 330 on the gas is not ideal, and the second cooling device 330 needs to be supplemented with coolant; at this time, the second flow control valve 432 is started to supplement the coolant in the insulation tank 430 into the second cooling device 330 until the detection value measured by the second temperature detector 331 reaches the expected range.

[0041] In the preferred embodiment of the above, the gas processing system 300 includes a preheating device 340. Figure 2 The preheating device 340 is used to heat and raise the temperature of the gas; by setting up the preheating device 340 before the gas enters the purification device 320 for purification, the preheating device 340 is used to preheat the gas to produce a certain temperature rise, which can improve the purification efficiency of the purification device 320 for the gas.

[0042] There are many specific structures of the preheating device 340. In this embodiment, a preheating pipe and a heat flow pipe are arranged inside the preheating device 340. The inlet end of the preheating pipe is connected to the gas outlet end of the first cooling device 310, and the outlet end of the preheating pipe is connected to the purification inlet end of the purification device 320; the heat flow inlet end of the heat flow pipe is connected to the purification outlet end of the purification device 320, and the heat flow outlet end of the heat flow pipe is connected to the gas inlet end of the second cooling device 330; the preheating pipe and the gas inside the heat flow pipe can exchange heat with each other, so that the gas inside the preheating pipe is heated and the gas inside the heat flow pipe is cooled. In this arrangement, considering that the gas after purification has a certain amount of residual heat, the residual heat can be used as the heat source of the preheating device 340 to preheat and heat the gas to be entered into the purification device 320, thereby forming a residual heat utilization pipeline. By utilizing the waste heat to heat the gas going to the purification device 320 through the pipeline, the power consumption of gas heating in the purification device 320 is reduced, which can also be regarded as a means to reduce the comprehensive energy consumption of hydrogen production by water electrolysis.

[0043] Among them, the present application does not impose any specific restrictions on the setting relationship between the preheating pipe and the heat flow pipe. For example, in a certain embodiment, the preheating pipe can be spirally wound around the outside of the heat flow pipe, and the preheating pipe and the heat flow pipe can be in contact with each other to achieve heat exchange between the preheating pipe and the gas inside the heat flow pipe. It should be noted that after understanding the technical solution of the present application, those skilled in the art can think of other setting relationships between the preheating pipe and the heat flow pipe without creative work, which should also fall within the scope of protection of the present application.

[0044] Furthermore, a third flow control valve 321 is arranged between the purification outlet end of the purification device 320 and the heat flow inlet end of the heat flow pipeline; the gas treatment system 300 also includes a bypass pipeline 322, the inlet end of the bypass pipeline 322 is arranged between the purification outlet end of the purification device 320 and the third flow control valve 321, and the outlet end of the bypass pipeline 322 is arranged between the heat flow outlet end of the heat flow pipeline and the gas inlet end of the second cooling device 330; a fourth flow control valve 323 is arranged on the bypass pipeline 322; the purification device 320 is provided with a third temperature detector 324, and the third temperature detector 324 is electrically connected to the third flow control valve 321 and the fourth flow control valve 323. In this embodiment, the internal temperature of the purification device 320 is detected in real time by setting a third temperature detector 324. When the detection value measured by the third temperature detector 324 is lower than the expected range, it proves that the temperature of the gas entering the purification device 320 is low. At this time, the third flow control valve 321 is increased, and the fourth flow control valve 323 is reduced or closed to allow more high-temperature gas to flow through the heat flow pipeline to enhance the preheating effect of the gas in the preheating pipeline. If the detection value measured by the third temperature detector 324 is still not up to the standard after closing the fourth flow control valve 323, the heating wire module installed in the purification device 320 is started, and the heating wire module is used to directly heat the gas. When the detection value measured by the third temperature detector 324 is higher than the expected range, it proves that the gas temperature in the purification device 320 is too high. At this time, the third flow control valve 321 can be reduced, and the fourth flow control valve 323 can be increased to allow part of the gas to bypass the preheating device 340 through the bypass pipeline 322.

[0045] In the preferred solution of the above embodiment, the gas processing system 300 includes a first gas-water separation device 350 and a second gas-water separation device 360. The first gas-water separation device 350 is arranged between the first cooling device 310 and the purification device 320; the second gas-water separation device 360 ​​is arranged at the gas outlet end of the second cooling device 330. Considering that the gas cooled by the first cooling device 310 and the second cooling device 330 contains a small amount of liquid, the first gas-water separation device 350 and the second gas-water separation device 360 ​​are arranged to separate gas from liquid to reduce the liquid content in the gas.

[0046] Furthermore, the gas processing system 300 further includes a drying device 370, which is disposed on a side of the second gas-water separation device 360 ​​away from the second cooling device 330. In this configuration, after the second gas-water separation device 360 ​​performs gas-liquid separation, the gas is dried by the drying device 370 to further remove the liquid content in the gas, thereby obtaining a pure target gas.

[0047] It should be noted that other contents of the water electrolysis hydrogen production system disclosed in the present invention are prior art and will not be described in detail here.

[0048] The above are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any direct / indirect application of the present invention in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A water electrolysis hydrogen production system, characterized in that: The water electrolysis hydrogen production system includes an electrolyzer, a gas-liquid separator, a gas processing system and a thermal management system; The gas-liquid separator is used to perform gas-liquid separation on the gas-liquid mixture formed by electrolysis of the raw water in the electrolytic cell to form gas, wherein the gas is transported to the gas processing system; The gas processing system comprises a first cooling device, a purification device and a second cooling device which are arranged in sequence; wherein the first cooling device and the second cooling device are both provided with a coolant, and heat exchange is performed between the coolant and the gas so that the gas is cooled and the coolant is heated; The thermal management system is used to receive the heated coolant in the first cooling device and the second cooling device and cool it down, and then re-transport the cooled coolant to the first cooling device and the second cooling device.

2. The water electrolysis hydrogen production system according to claim 1, characterized in that: The thermal management system comprises an evaporative condensation device, which comprises a condenser and at least two evaporation pools. The condenser is sequentially arranged in each evaporation pool, and the inlet end of the condenser is connected to the coolant outlet end of the first cooling device or the second cooling device, and the outlet end of the condenser is connected to the coolant inlet end of the first cooling device or the second cooling device; each evaporation pool is filled with cooling water, and heat exchange is performed between the cooling water and the coolant in the condenser, so that the coolant is cooled and the cooling water is heated; Furthermore, the pipe section of the condenser pipe located in the evaporation pool is distributed in a serpentine shape.

3. The water electrolysis hydrogen production system according to claim 2, characterized in that: A connecting pipe is arranged between the adjacent evaporation pools, and a first one-way valve is installed on the connecting pipe, and the conduction direction of the first one-way valve points to the evaporation pool of the upper level; the evaporation pool located at the lowest level is connected to a water injection port, and the water injection port is used to inject the cooling water into the evaporation pool.

4. The water electrolysis hydrogen production system according to claim 2, characterized in that: A gas collecting pipe is provided in each stage of the evaporation pool, and the gas collecting pipe is used to collect the steam formed by the evaporation of the heated cooling water; the gas collecting pipe is sequentially arranged in the evaporation pools of each stage; when the steam moves along the gas collecting pipe to the evaporation pool of the next stage, the cooling water with a relatively low temperature in the evaporation pool of the next stage performs heat exchange with the steam in the gas collecting pipe, so that the steam is cooled and condensed to form liquid water; the outlet end of the gas collecting pipe is connected to the evaporation pool of the lowest stage or the electrolytic cell.

5. The water electrolysis hydrogen production system according to claim 2, characterized in that: A compression device is provided at the coolant inlet end of the evaporative condensation device, and the compression device is used to compress the coolant; And / or, a coolant outlet end of the evaporative condensation device is provided with an insulating tank, and the insulating tank is used to store the cooled coolant.

6. The water electrolysis hydrogen production system according to claim 5, characterized in that: A first flow control valve is arranged between the insulated tank and the first cooling device, a first temperature detector is arranged at the gas outlet end of the first cooling device, and the first temperature detector is electrically connected to the first flow control valve; and / or, a second flow control valve is arranged between the insulated tank and the second cooling device, a second temperature detector is arranged at the gas outlet end of the second cooling device, and the second temperature detector is electrically connected to the second flow control valve.

7. The water electrolysis hydrogen production system according to claim 1, characterized in that: The gas processing system comprises a preheating device, and the preheating device is used to heat and raise the temperature of the gas; A preheating pipe and a heat flow pipe are arranged inside the preheating device, the inlet end of the preheating pipe is connected to the gas outlet end of the first cooling device, and the outlet end of the preheating pipe is connected to the purification inlet end of the purification device; the heat flow inlet end of the heat flow pipe is connected to the purification outlet end of the purification device, and the heat flow outlet end of the heat flow pipe is connected to the gas inlet end of the second cooling device; the preheating pipe and the gas inside the heat flow pipe can exchange heat with each other, so that the gas inside the preheating pipe is heated up and the gas inside the heat flow pipe is cooled down.

8. The water electrolysis hydrogen production system according to claim 7, characterized in that: A third flow control valve is provided between the purification outlet end of the purification device and the heat flow inlet end of the heat flow pipeline; The gas processing system further comprises a bypass pipeline, the inlet end of the bypass pipeline is arranged between the purification outlet end of the purification device and the third flow control valve, and the outlet end of the bypass pipeline is arranged between the heat flow outlet end of the heat flow pipeline and the gas inlet end of the second cooling device; a fourth flow control valve is arranged on the bypass pipeline; The purification device is provided with a third temperature detector, and the third temperature detector is electrically connected to the third flow control valve and the fourth flow control valve.

9. The water electrolysis hydrogen production system according to claim 1, characterized in that: The gas processing system comprises a first gas-water separation device and a second gas-water separation device, wherein the first gas-water separation device is arranged between the first cooling device and the purification device; and the second gas-water separation device is arranged at the gas outlet end of the second cooling device.

10. The water electrolysis hydrogen production system according to claim 9, characterized in that: The gas processing system further includes a drying device, which is disposed on a side of the second gas-water separation device away from the second cooling device.

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