A compression purification system and method of industrial by-product hydrogen

Abstract

The application discloses a kind of industrial by-product hydrogen compression purification system and method, system includes no gas valve mechanical compressor, atomizer, electrochemical compressor, dehumidifier and gas tank;First atomizer is set in the compression cavity of no gas valve mechanical compressor, for in the process of no gas valve mechanical compressor compression to the compression cavity in water spray;The compressed gas outlet of no gas valve mechanical compressor is connected with the anode side inlet of electrochemical compressor by pipeline and is equipped with second atomizer for hydrogen humidification in pipeline;The cathode side of electrochemical compressor is equipped with the atomizer for humidifying the cathode membrane of electrochemical compressor;The cathode side outlet of electrochemical compressor is connected with gas tank and is equipped with dehumidifier for hydrogen dehumidification on the connecting pipeline.The application fully combines the characteristics of mechanical compressor and electrochemical compressor, designs efficient and feasible system, and obtains relatively pure high-pressure hydrogen.

Description

Technical Field

[0001] This invention belongs to the field of compressor technology, specifically relating to a compression and purification system and method for industrial by-product hydrogen. Background Technology

[0002] Hydrogen energy, as an energy carrier to support the dual carbon goals of the future, has been vigorously developed. Currently, hydrogen production is mainly generated through the cracking and pyrolysis of fossil fuels. The production of hydrogen from fossil fuel reforming must be combined with CCUS technology (Carbon Capture, Utilization and Storage), which raises the cost of coal-to-hydrogen and natural gas-to-hydrogen to 12-24 yuan / kg. In contrast, industrial by-product hydrogen can serve as an important source of hydrogen.

[0003] Industrial by-product hydrogen mainly includes hydrogen from chlor-alkali production, hydrogen from coke oven gas production, and hydrogen from aromatics reforming. Its cost can be controlled to 8-20 yuan / kg. However, industrial by-product hydrogen usually contains other impurity gases, thus requiring purification. Furthermore, due to the low energy density of hydrogen, it typically needs to be compressed to higher pressures before storage. In summary, to ensure the integrity and feasibility of the industrial by-product hydrogen production chain, a reasonable solution is urgently needed for the separation, purification, and pressurized storage of the produced hydrogen. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention aims to provide a compression purification system and method for industrial by-product hydrogen, which can perform batch purification and pressurized storage of industrial by-product hydrogen.

[0005] The technical solution adopted in this invention is as follows:

[0006] A compression and purification system for industrial by-product hydrogen includes a valveless mechanical compressor, a first sprayer, an electrochemical compressor, a dehumidifier, and a gas storage tank.

[0007] The first sprayer is installed inside the compression chamber of the valveless mechanical compressor and is used to spray water into the compression chamber during the compression process of the valveless mechanical compressor.

[0008] The compressed gas outlet of the valveless mechanical compressor is connected to the anode side inlet of the electrochemical compressor via a pipeline, and a second sprayer for humidifying the hydrogen in the pipeline is provided on the pipeline.

[0009] The cathode side of the electrochemical compressor is equipped with a sprayer for humidifying the cathode membrane of the electrochemical compressor;

[0010] The cathode-side outlet of the electrochemical compressor is connected to a gas storage tank, and a dehumidifier for dehumidifying hydrogen is installed on the connecting pipeline.

[0011] Preferably, the inlet end of the valveless mechanical compressor is equipped with a flow meter, and both the flow meter and the first sprayer are connected to the flow control system. The flow control system can control the amount of water sprayed by the first sprayer based on the hydrogen flow rate detected by the flow meter.

[0012] Preferably, a first humidity sensor is installed upstream of the second sprayer on the pipeline connecting the compressed gas outlet of the valveless mechanical compressor and the anode side inlet of the electrochemical compressor. Both the first humidity sensor and the second sprayer are connected to a humidity control system. The humidity control system can control the water spray volume of the second sprayer according to the detection result of the first humidity sensor, so that the hydrogen humidity at the anode side inlet of the electrochemical compressor meets the processing requirements of the electrochemical compressor.

[0013] Preferably, a mixing chamber is connected to the pipeline connecting the compressed gas outlet of the valveless mechanical compressor to the anode side inlet of the electrochemical compressor, and the second atomizer is disposed in the inner cavity of the mixing chamber.

[0014] Preferably, the anode-side inlet and cathode-side outlet of the electrochemical compressor are respectively equipped with a first pressure sensor and a second pressure sensor. Both the first pressure sensor and the second pressure sensor are connected to the current control system of the electrochemical compressor. The current control system of the electrochemical compressor can control the pressure ratio of the electrochemical compressor based on the first pressure sensor and the second pressure sensor.

[0015] Preferably, the cathode-side outlet of the electrochemical compressor is provided with a second humidity sensor, and the second humidity sensor and the sprayer on the cathode side of the electrochemical compressor are connected to a humidity control system. The humidity control system can control the amount of water sprayed by the sprayer on the cathode side of the electrochemical compressor based on the detection value of the second humidity sensor.

[0016] Preferably, the electrochemical compressor is replaced with an electrochemical compressor unit, which includes at least two electrochemical compressors connected in parallel.

[0017] Preferably, the industrial by-product hydrogen compression and purification system further includes a water tank, and the first sprayer, the second sprayer, the bottom of the electrochemical compressor, and the sprayer on the cathode side of the electrochemical compressor are all connected to the water tank.

[0018] Preferably, the valveless mechanical compressor of the present invention refers to one without intake and exhaust valves, that is, it does not need to rely on opening the valve plate to exhaust at the end of the compression process. Therefore, no "liquid slugging" phenomenon occurs when water is sprayed into the compression chamber. Typical examples include centrifugal compressors, screw compressors, and scroll compressors. Therefore, the valveless mechanical compressor of the present invention can be at least one of centrifugal compressors, screw compressors, and scroll compressors.

[0019] This invention also provides a method for compressing and purifying industrial by-product hydrogen. This method utilizes the industrial by-product hydrogen compression and purification system described above, and includes the following steps:

[0020] A mixed gas containing hydrogen produced by industrial by-product hydrogen production is fed into a valveless mechanical compressor. During the compression process of the valveless mechanical compressor, the water spray volume of the first sprayer is controlled to maintain the temperature of the valveless mechanical compressor within a preset temperature range.

[0021] Hydrogen gas compressed by a valveless mechanical compressor is humidified by a second sprayer and then introduced into an electrochemical compressor for secondary pressurization.

[0022] During the secondary pressurization of hydrogen by the electrochemical compressor, the cathode membrane of the electrochemical compressor is humidified by a sprayer on the cathode side of the electrochemical compressor to maintain the cathode membrane at a preset humidity level.

[0023] Hydrogen gas, after being pressurized twice by an electrochemical compressor, is dehumidified by a dehumidifier and then sent to a storage tank for storage.

[0024] The present invention has the following beneficial effects:

[0025] The present invention relates to a system strategy for the compression and purification of industrial by-product hydrogen, which combines a valveless mechanical compressor with an electrochemical compressor for the separation and purification of industrial by-product hydrogen. The electrochemical compressor not only significantly increases hydrogen pressure but also isolates other gases, thereby purifying the hydrogen. However, the electrochemical compressor requires the incoming hydrogen to be wet hydrogen with a relative humidity close to 100% and has a relatively small volumetric flow rate. Therefore, the present invention utilizes a valveless mechanical compressor for primary pressurization, which reduces the volumetric flow rate of the hydrogen mixture to a certain extent, allowing the subsequent electrochemical compressor (or a parallel electrochemical compressor unit) to address the flow rate connection issue. Simultaneously, a first atomizer is installed within the compression chamber of the valveless mechanical compressor. This first atomizer humidifies the hydrogen during mechanical compression by spraying water for "wet compression." The water mist sprayed by the first atomizer also absorbs the heat of compression, thereby improving the working efficiency of the valveless mechanical compressor. This scheme cleverly combines mechanical compression and electrochemical pressurization processes, using water as a medium to connect the two parts of the system to meet the special operating requirements of each stage, greatly improving the efficiency and economy of the entire system.

[0026] Furthermore, the valveless mechanical compressor of this invention preferably employs at least one of centrifugal compressors, screw compressors, and scroll compressors. There are various methods of mechanical hydrogen compression. To achieve higher pressures, reciprocating piston compressors and diaphragm compressors are commonly used. However, both reciprocating piston compressors and diaphragm compressors contain valve components. When the compressed gas contains liquid components such as water mist or droplets, liquid slugging easily occurs due to the incompressibility of liquids, causing damage to components such as valves and cylinders. In contrast, the centrifugal compressor, screw compressor, and scroll compressor selected in this invention do not experience liquid slugging when water is sprayed into the compression chamber. Therefore, based on the above considerations, this invention employs valveless mechanical compressors such as centrifugal compressors, screw compressors, and scroll compressors. Among these three types of valveless mechanical compressors, centrifugal compressors, compared to screw compressors and scroll compressors, are suitable for high-flow-rate gas compression applications and can operate stably for extended periods with minimal maintenance, making them suitable for applications such as gas storage facilities. For applications with smaller gas volumes, screw compressors and scroll compressors can be used. For different applications, flow rate matching during the compression process can be achieved by connecting valveless mechanical compressors in parallel and / or electrochemical compressors in parallel. When a centrifugal compressor is used for pure hydrogen compression, the small molecular weight of hydrogen makes it difficult to generate sufficient centrifugal force, thus preventing the achievement of a high pressure ratio. However, in this invention, because hydrogen produced as a byproduct of industrial hydrogen production contains a significant amount of other heavy components, a higher pressure ratio can be achieved using a centrifugal compressor. The addition of a water spray process allows the water mist to not only vaporize and absorb heat, improving compressor efficiency, but also increases the apparent relative molecular mass of the generated water vapor, thereby increasing the centrifugal force generated by the compressor and achieving a higher pressure ratio. The water-spraying "wet compression" makes good use of the heat of compression, providing hydrogen with a relatively high humidity to the electrochemical compressor behind it, which greatly reduces the energy consumption of special hydrogen wetting. Attached Figure Description

[0027] Figure 1 This is a flowchart of the compression and purification system for industrial by-product hydrogen of the present invention during the compression process.

[0028] In the diagram: 11-Flow meter, 12-First sprayer, 2-Valveless mechanical compressor, 31-Mixing chamber, 32-First humidity sensor, 33-Second sprayer, 411-First electrochemical compressor, 412-Second electrochemical compressor, 42-First pressure sensor, 43-Second pressure sensor, 44-Second humidity sensor, 451-Third sprayer, 452-Fourth sprayer, 5-Water tank, 6-Gas storage tank. Detailed Implementation

[0029] In the following, specific embodiments of this application will be described in detail with reference to the accompanying drawings. Based on these detailed descriptions, those skilled in the art will be able to clearly understand and implement this application. Without departing from the principles of this application, features from various embodiments can be combined to obtain new implementations, or certain features from some embodiments can be substituted to obtain other preferred implementations.

[0030] See Figure 1 The present invention discloses a compression and purification system for industrial by-product hydrogen, comprising a valveless mechanical compressor, a first sprayer 12, an electrochemical compressor, a dehumidifier, and a gas storage tank 6; the first sprayer 12 is disposed in the compression chamber of the valveless mechanical compressor and is used to spray water into the compression chamber during the compression process of the valveless mechanical compressor; the compressed gas outlet of the valveless mechanical compressor is connected to the anode side inlet of the electrochemical compressor through a pipeline, and a second sprayer 33 for humidifying the hydrogen in the pipeline is provided on the pipeline; a sprayer for humidifying the cathode membrane of the electrochemical compressor is provided on the cathode side of the electrochemical compressor; the cathode side outlet of the electrochemical compressor is connected to the gas storage tank 6, and a dehumidifier for dehumidifying the hydrogen is provided on the connecting pipeline.

[0031] The working principle of the above-mentioned industrial by-product hydrogen compression and purification system of the present invention includes the following process:

[0032] A mixed gas containing hydrogen produced by industrial by-product hydrogen production is fed into a valveless mechanical compressor. During the compression process, the amount of water sprayed by the first sprayer 12 is controlled to keep the temperature of the compressor within a preset temperature range. This temperature range is relatively lower than the normal temperature of the valveless mechanical compressor. This not only humidifies the hydrogen but also improves the working efficiency of the valveless mechanical compressor.

[0033] The hydrogen gas compressed by the compressor is humidified through the second sprayer 33 and then introduced into the electrochemical compressor for secondary pressurization;

[0034] During the secondary pressurization of hydrogen by the electrochemical compressor, the cathode membrane of the electrochemical compressor is humidified by a sprayer on the cathode side of the electrochemical compressor to maintain the cathode membrane at a preset humidity level.

[0035] The hydrogen gas, after being pressurized twice by the electrochemical compressor, is dehumidified by a dehumidifier and then sent to the gas storage tank 6 for storage.

[0036] The principle of the electrochemical compressor used in this invention is to convert hydrogen into hydrogen protons at the anode membrane, pass through the proton exchange membrane, and recombine into hydrogen molecules at the cathode side. By increasing the current, the pressure ratio is increased, and the proton exchange membrane only allows proton transport and prevents the permeation of other types of gases, thereby achieving the purification of hydrogen.

[0037] In the above-mentioned solution of the present invention, the electrochemical compressor requires the proton exchange membrane to be fully hydrated during normal operation and needs to be continuously humidified in the hydrogen flow during use. The valveless mechanical compressor can improve process efficiency by spraying water into the cylinder, and the generated wet hydrogen can just meet the requirements of the electrochemical compressor for the humidity of the incoming hydrogen.

[0038] As a further preferred embodiment of the present invention, in order to improve the accuracy of water spraying by the first sprayer 12, a flow meter 11 is provided at the inlet end of the compressor, and a flow control system is also provided. Both the flow meter 11 and the first sprayer 12 are connected to the flow control system. The flow control system can accurately control the amount of water sprayed by the first sprayer 12 according to the hydrogen flow rate detected by the flow meter 11, so that the temperature of the valveless mechanical compressor is maintained within the preset temperature range. For centrifugal compressors, the injection of water increases the apparent relative molecular mass, and the centrifugal force of the gas moving in the compressor increases, which is beneficial to the improvement of the hydrogen pressure ratio.

[0039] As a further preferred embodiment of the present invention, in order to improve the accuracy of water spraying by the second sprayer 33, a first humidity sensor 32 is provided upstream of the second sprayer 33 on the pipeline connecting the compressed gas outlet of the compressor and the anode side inlet of the electrochemical compressor. Both the first humidity sensor 32 and the second sprayer 33 are connected to a humidity control system. The humidity control system can control the amount of water sprayed by the second sprayer 33 according to the detection result of the first humidity sensor 32, so that the hydrogen humidity at the anode side inlet of the electrochemical compressor meets the processing requirements of the electrochemical compressor.

[0040] As a further preferred embodiment of the present invention, a mixing chamber 31 is connected to the pipeline connecting the compressed gas outlet of the compressor and the anode side inlet of the electrochemical compressor. The second atomizer 33 is disposed in the inner cavity of the mixing chamber 31. The mixing chamber 31 is a container with a large cavity. In the mixing chamber 31, the water sprayed by the second atomizer 33 can fully wet the hydrogen compressed by the valveless mechanical compressor. At the same time, the mixing chamber 31 can also serve as a buffer tank to ensure the stability of the hydrogen flow rate and pressure at the anode side inlet of the electrochemical compressor.

[0041] As a further preferred embodiment of the present invention, the present invention provides a first pressure sensor 42 and a second pressure sensor 43 at the anode side inlet and the cathode side outlet of the electrochemical compressor, respectively. Both the first pressure sensor 42 and the second pressure sensor 43 are connected to the current control system of the electrochemical compressor. The current control system of the electrochemical compressor can control the pressure ratio of the electrochemical compressor according to the first pressure sensor 42 and the second pressure sensor 43, so as to ensure that the electrochemical compressor operates under preset conditions and improve the compression effect.

[0042] As a further preferred embodiment of the present invention, in order to improve the accuracy of water spraying by the sprayer on the cathode side of the electrochemical compressor, the present invention provides a second humidity sensor 44 at the cathode side outlet of the electrochemical compressor. The second humidity sensor 44 and the sprayer on the cathode side of the electrochemical compressor are connected to a humidity control system. The humidity control system can control the amount of water sprayed by the sprayer on the cathode side of the electrochemical compressor based on the detection value of the second humidity sensor 44.

[0043] As a further preferred embodiment of the present invention, the electrochemical compressor can be replaced with an electrochemical compressor unit, which includes at least two electrochemical compressors connected in parallel. This parallel connection of electrochemical compressors solves the flow rate matching problem between the valveless mechanical compressor and the electrochemical compressor. Since the hydrogen production of the two differs, the present invention… Figure 1 The electrochemical compressors are used in parallel, with two marked on the flow chart. Depending on the flow rate, multiple compressors can be used.

[0044] As a further preferred embodiment of the present invention, in order to enable the water in the entire system to be recycled, the present invention also includes a water tank 5. The first sprayer 12, the second sprayer 33, the bottom of the electrochemical compressor, and the sprayer on the cathode side of the electrochemical compressor are all connected to the water tank 5. The water tank 5 can provide water for the first sprayer 12, the second sprayer 33, and the electrochemical compressor, and can also recycle the water that is finally collected in the electrochemical compressor. The specific principle is explained as follows: The system introduces the moist hydrogen gas generated by the centrifugal compressor into the electrochemical compressor for secondary pressurization. Due to the dehumidification effect of hydrogen gas in electrochemistry, that is, since the vapor pressure is determined by temperature, the electrochemical compression process is basically isothermal, and the vapor pressure on both sides of the electrochemical compressor is equal. The fully humidified unit mass of hydrogen gas contains more water at low pressure than at high pressure. Therefore, most of the water in the moist hydrogen gas will precipitate out during the compression process, reducing humidity and fully hydrating the cathode membrane of the electrochemical compressor, improving the efficiency of the electrochemical compressor, and returning the precipitated water to the water spray end of the valveless mechanical compressor, so that the water in the entire system can be recycled.

[0045] Example

[0046] like Figure 1As shown, the industrial by-product hydrogen compression and purification system in this embodiment mainly includes a centrifugal compressor, a first electrochemical compressor 411, and a second electrochemical compressor 412. A flow meter 11 is installed at the inlet of the centrifugal compressor, through which low-pressure hydrogen enters the centrifugal compressor. The flow meter 11 and the first sprayer 12 are both connected to the flow control system. The centrifugal compressor is connected to the mixing chamber 31 through a gas path. A second sprayer 33 is installed in the mixing chamber 31. A first humidity sensor 32 is installed on the gas path. Both the first humidity sensor 32 and the second sprayer 33 are connected to a humidity control system. The humidity control system can control the amount of water sprayed by the second sprayer 33 based on the detection result of the first humidity sensor 32.

[0047] The mixing chamber 31 is connected to the anode-side inlet of the first electrochemical compressor 411 and the second electrochemical compressor 412 via a gas duct. The first electrochemical compressor 411 and the second electrochemical compressor 412 are connected in parallel. The inlet and outlet sides of the parallel structure of the first electrochemical compressor 411 and the second electrochemical compressor 412 are respectively connected to the first pressure sensor 42 and the second pressure sensor 43. The first pressure sensor 42 and the second pressure sensor 43 are used to detect the inlet and outlet pressures of the electrochemical compressor group, and the detection results are used as inputs to the current control system of the electrochemical compressor. The cathode side of the electrochemical compressor group is also connected to the second humidity sensor 44. The cathode side of the first electrochemical compressor 411 is equipped with a fourth sprayer 452, and the cathode side of the second electrochemical compressor 412 is equipped with a third sprayer 451. The second humidity sensor 44, the third sprayer 451 and the fourth sprayer 452 are connected to a humidity control system. The humidity control system controls the third sprayer 451 and the fourth sprayer 452 to spray water onto the cathode side of the second electrochemical compressor 412 and the first electrochemical compressor 411. The bottoms of both the first electrochemical compressor 411 and the second electrochemical compressor 412 are connected to the water tank 5. The water tank 5 is also connected to the first sprayer 12, the second sprayer 33, the third sprayer 451, and the fourth sprayer 452. The hydrogen gas produced after compression passes through a dehumidifier and is connected to the gas storage tank 6. The impurity gases separated by the first and second electrochemical compressors 411 and 412 are then processed in other application systems.

[0048] The specific working process of the industrial by-product hydrogen compression and purification system in this embodiment includes:

[0049] The hydrogen-containing mixed gas produced by industrial by-product hydrogen production enters the centrifugal compressor through flow meter 11. The flow control system controls the water spray volume of sprayer 12 based on the gas flow rate at the centrifugal compressor inlet measured by flow meter 11, so that the temperature of the centrifugal compressor does not become too high, while increasing the apparent relative molecular mass, increasing the centrifugal force, and reducing the difficulty of hydrogen compression. The hydrogen at the outlet of the centrifugal compressor is introduced into the electrochemical compressor unit for secondary pressurization. Since the first electrochemical compressor 411 and the second electrochemical compressor 412 in the electrochemical compressor unit need to be fully hydrated by the cathode and anode membranes during the pressurization process, the incoming hydrogen needs to be sufficiently moistened. The hydrogen produced by the centrifugal compressor needs to be further moistened before entering the first electrochemical compressor 411 and the second electrochemical compressor 412. The full wetting process takes place in the mixing chamber 31. A first humidity sensor 32 is installed in the compressed gas outlet pipe of the centrifugal compressor 2. The humidity control system controls the water spray volume of the second sprayer 33 based on the detection result of the first humidity sensor 32, so that the hydrogen in the mixing chamber 31 is moistened to the humidity level of full hydration of the anode membrane.

[0050] Due to the dehumidification effect of hydrogen in the electrochemical compressor, water in the wetted hydrogen is separated, wets the proton exchange membrane, and flows into the water tank 5. At the same time, the water tank 5 also provides water to the first sprayer 12, the second sprayer 33, the third sprayer 451, and the fourth sprayer 452, so that the water in the whole system is circulated.

[0051] The electrochemical compressor unit has a first pressure sensor 42 and a second pressure sensor 43 on both the anode and cathode sides, respectively. These sensors detect pressure signals on both sides of the compressor unit, which are then applied to the power supply of the compressor to control the compressor's pressure ratio by altering the current. Simultaneously, a humidity sensor 43 measures the outlet humidity. When the humidity drops to a certain level, it indicates that the cathode membrane has dehydrated, requiring the third sprayer 451 and the fourth sprayer 452 to humidify the cathode membranes of the second electrochemical compressor 412 and the first electrochemical compressor 411. Therefore, the hydrogen gas after compression carries a trace amount of moisture, which is then dried by a dehumidifier before entering the high-pressure hydrogen storage tank 6 for storage and transportation.

[0052] In the above-mentioned scheme of the present invention, the characteristics of centrifugal compressor and electrochemical compressor are fully combined. First, the centrifugal compressor is used to pre-pressurize the hydrogen produced by industrial by-products. During the compression process, water is sprayed into the compression chamber to improve the compression efficiency, generating a high-pressure hydrogen mixture with high humidity. The formed hydrogen is further wetted and then enters the electrochemical compressor unit. The water vapor contained therein can be used to wet the membrane of the electrochemical compressor. The electrochemical compressor performs secondary pressurization on the hydrogen, which greatly increases the hydrogen pressure. At the same time, the selective permeability principle of the proton exchange membrane of the electrochemical compressor can remove impurity gases in the hydrogen produced by industrial by-products, resulting in relatively pure high-pressure hydrogen.

Claims

1. A compression and purification system for industrial by-product hydrogen, characterized in that, It includes a valveless mechanical compressor, a first sprayer (12), an electrochemical compressor, a dehumidifier, and a gas storage tank (6); The first sprayer (12) is installed in the compression chamber of the valveless mechanical compressor and is used to spray water into the compression chamber during the compression process of the valveless mechanical compressor. The compressed gas outlet of the valveless mechanical compressor is connected to the anode side inlet of the electrochemical compressor via a pipeline, and a second sprayer (33) for humidifying the hydrogen in the pipeline is provided on the pipeline. The cathode side of the electrochemical compressor is equipped with a sprayer for humidifying the cathode membrane of the electrochemical compressor; The cathode side outlet of the electrochemical compressor is connected to the gas storage tank (6), and a dehumidifier for dehumidifying hydrogen is provided on the connecting pipeline. The inlet end of the valveless mechanical compressor is equipped with a flow meter (11). The flow meter (11) and the first sprayer (12) are both connected to the flow control system. The flow control system can control the amount of water sprayed by the first sprayer (12) according to the hydrogen flow detected by the flow meter (11). A first humidity sensor (32) is installed upstream of the second sprayer (33) on the pipeline connecting the compressed gas outlet of the valveless mechanical compressor to the anode side inlet of the electrochemical compressor. The first humidity sensor (32) and the second sprayer (33) are both connected to a humidity control system. The humidity control system can control the amount of water sprayed by the second sprayer (33) according to the detection result of the first humidity sensor (32), so that the hydrogen humidity at the anode side inlet of the electrochemical compressor meets the processing requirements of the electrochemical compressor. The anode side inlet and cathode side outlet of the electrochemical compressor are respectively equipped with a first pressure sensor (42) and a second pressure sensor (43). The first pressure sensor (42) and the second pressure sensor (43) are both connected to the current control system of the electrochemical compressor. The current control system of the electrochemical compressor can control the pressure ratio of the electrochemical compressor according to the first pressure sensor (42) and the second pressure sensor (43).

2. The compression and purification system for industrial by-product hydrogen according to claim 1, characterized in that, A mixing chamber (31) is connected to the pipeline connecting the compressed gas outlet of the valveless mechanical compressor to the anode side inlet of the electrochemical compressor, and the second sprayer (33) is disposed in the inner cavity of the mixing chamber (31).

3. The compression and purification system for industrial by-product hydrogen according to claim 1, characterized in that, The cathode side outlet of the electrochemical compressor is provided with a second humidity sensor (44). The second humidity sensor (44) and the sprayer on the cathode side of the electrochemical compressor are connected to a humidity control system. The humidity control system can control the amount of water sprayed by the sprayer on the cathode side of the electrochemical compressor according to the detection value of the second humidity sensor (44).

4. A compression and purification system for industrial by-product hydrogen according to claim 1 or 3, characterized in that, The electrochemical compressor is replaced with an electrochemical compressor unit, which includes at least two electrochemical compressors connected in parallel.

5. The compression and purification system for industrial by-product hydrogen according to claim 1, characterized in that, It also includes a water tank (5), a first sprayer (12), a second sprayer (33), the bottom of the electrochemical compressor, and a sprayer on the cathode side of the electrochemical compressor, all of which are connected to the water tank (5).

6. The compression and purification system for industrial by-product hydrogen according to claim 1, characterized in that, The valveless mechanical compressor includes at least one of centrifugal compressor, screw compressor, and scroll compressor.

7. A method for compressing and purifying industrial by-product hydrogen, characterized in that, This method employs the compression and purification system for industrial by-product hydrogen as described in any one of claims 1-6, and the method includes: The mixed gas containing hydrogen produced by industrial by-product hydrogen production is sent into a valveless mechanical compressor. During the compression process of the valveless mechanical compressor, the amount of water sprayed by the first sprayer (12) is controlled so that the temperature of the valveless mechanical compressor is maintained within the preset temperature range. Hydrogen compressed by a valveless mechanical compressor is humidified by a second sprayer (33) and then introduced into an electrochemical compressor for secondary pressurization. During the secondary pressurization of hydrogen by the electrochemical compressor, the cathode membrane of the electrochemical compressor is humidified by a sprayer on the cathode side of the electrochemical compressor to maintain the cathode membrane at a preset humidity level. The hydrogen gas, after being pressurized twice by the electrochemical compressor, is dehumidified by a dehumidifier and then sent to the gas storage tank (6) for storage.

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