CN218539839U - Water electrolysis hydrogen production system - Google Patents

Abstract

The application discloses electrolytic water hydrogen production system, including electrolysis trough and temperature detect element, the electrolysis trough communicates with oxyhydrogen side separator respectively, and the common intercommunication of discharge gate department of two separators has the connecting tube, and the series connection is provided with the heater on the connecting tube, cooler and circulating pump, is provided with the governing valve on the coolant pipeline of cooler. The heater can heat the electrolyte, the temperature detection element detects the temperature of the electrolyte, and when the temperature of the electrolyte is lower than a set value, the heater is started to heat the electrolyte; when the temperature of the electrolyte exceeds a set value, the heater stops operating. The cooler controls the flow of the cooling medium through the regulating valve, thereby controlling the heat exchange load of the cooler. The electrolyte can be heated to maintain the lowest temperature before the start of the electrolytic bath or when the electrolytic bath is in low load operation for a long time or the electrolytic bath stops operating. Further, the starting speed of the electrolytic hydrogen production system can be improved, and the stability and the safety of the system operation are ensured.

Description

Water electrolysis hydrogen production system

Technical Field

The application relates to the field of hydrogen production, in particular to a water electrolysis hydrogen production system.

Background

The electrolytic cell in the water electrolysis hydrogen production system releases heat during working, the control of the working temperature of the electrolytic cell is of great importance, and the control of the working temperature of the electrolytic cell is mainly realized by controlling the temperature of the electrolyte. The working temperature of the alkaline electrolytic cell is generally 80-95 ℃, the higher the working temperature of the electrolytic cell is, the lower the unit energy consumption of the hydrogen production system is, but the too high temperature can cause adverse effects on the diaphragm and the sealing of the electrolytic cell, even damage equipment. Therefore, in order to reduce the unit energy consumption of the hydrogen production system and ensure the safe and stable operation of the equipment, the temperature of the electrolytic cell needs to be controlled at the optimal working condition, and is as stable as possible to avoid fluctuation.

However, the existing hydrogen production system by electrolysis has a slow cold start-up speed, the temperature of the electrolytic cell is slowly raised from the ambient temperature to the rated working temperature, generally about half an hour, and in the start-up process, the gas production rate of the electrolytic cell is gradually increased from low to high along with the increase of the working temperature of the electrolytic cell, and the hydrogen production system has high unit energy consumption when the temperature is low. Meanwhile, when the electrolytic hydrogen production system is in a shutdown state, the environment temperature is too low, so that the electrolyte can generate solid crystals, and if crystalline substances are generated in the electrolytic cell and the circulating pump, the equipment can be damaged. If the crystalline substance is generated in the pressure guide pipeline of the pressure detection element, the pressure detection and control can be caused to be out of order, and the safe operation of the electrolyzed water hydrogen production system can be seriously damaged.

SUMMERY OF THE UTILITY MODEL

The application provides an electrolytic water hydrogen production system, which solves the problems that in the prior art, the starting speed of the system is low, and when the system stops running, the produced crystals easily damage pipelines and equipment, so that the running safety is influenced.

In order to solve the above technical problem, the present application provides a system for producing hydrogen by electrolyzing water, comprising:

electrolytic cell and temperature-detecting element, the hydrogen side export of electrolytic cell has hydrogen side separator through a hydrogen pipeline intercommunication, the oxygen side export of electrolytic cell has oxygen side separator through an oxygen pipeline intercommunication, hydrogen side separator with the common intercommunication of discharge gate department of oxygen side separator has the connecting tube, the last series connection of connecting tube is provided with heater, cooler and circulating pump, the other end of connecting tube with the electrolyte entry intercommunication of electrolytic cell, be provided with the governing valve on the coolant pipeline of cooler.

Preferably, a flow meter is further arranged on the connecting pipeline.

Preferably, a communication pipeline is further arranged between the hydrogen side separator and the oxygen side separator.

Preferably, the temperature sensing element is located on the connection pipe.

Preferably, an electric heating power controller is further integrated in the heater or the heater is a dividing wall heat exchanger.

Preferably, when the heater is a partition wall heat exchanger, the regulating valve is further provided at a heating medium inlet of the heater.

Preferably, a steam trap is further arranged at the heating medium outlet of the heater.

Preferably, a valve is further arranged on the cooling medium pipeline of the cooler.

Preferably, the number of the heater, the cooler and the circulating pump is plural.

Preferably, the device also comprises a check valve, wherein the check valve is positioned between the circulating pump and the electrolytic bath or is positioned in front of the inlet of the circulating pump.

Preferably, the method further comprises the following steps:

the filter is arranged on the connecting pipeline, a bypass pipeline is further arranged at the position, located on the filter, of the connecting pipeline, and the inlet and the outlet of the filter and the bypass pipeline are all provided with the valve.

Preferably, an exhaust pipeline is further arranged at the inlet or the outlet of the filter, and the valve is arranged on the exhaust pipeline.

Compared with the prior art, the water electrolysis hydrogen production system that this application provided, including electrolysis trough and temperature detect element, the electrolysis trough respectively with hydrogen side separator and oxygen side separator intercommunication, the common intercommunication of discharge gate department of two separators has the connecting tube with the electrolyte entry intercommunication of electrolysis trough, establish ties on the connecting tube and is provided with the heater, cooler and circulating pump are provided with the governing valve on the coolant pipeline of cooler.

The hydrogen liquid mixture is discharged from the hydrogen side outlet of the electrolytic cell and enters a hydrogen side separator; the oxygen-liquid mixture is discharged from the oxygen side of the electrolytic cell and enters an oxygen side separator; the electrolyte separated by the hydrogen side separator and the oxygen side separator is converged into a heater, then enters a cooler, and is pumped into an electrolyte inlet of the electrolytic cell by a circulating pump. The heater can heat the electrolyte, the temperature detection element detects the temperature of the electrolyte, and when the temperature of the electrolyte is lower than a set value, the heater is started to heat the electrolyte; when the temperature of the electrolyte reaches or exceeds a set value, the heater stops running. The cooler controls the flow of the cooling medium through the cooler through the regulating valve, thereby controlling the heat exchange load of the cooler. The electrolyte can be heated before the start of the electrolytic cell, when the electrolytic cell is in low load and operates for a long time, the electrolyte is heated, and when the electrolytic cell stops operating, the electrolyte is maintained at the lowest temperature. Further, the starting speed of the electrolytic hydrogen production system can be increased, solid crystals caused by too low temperature of the electrolyte can be prevented from being generated, equipment and pipelines in the system can be prevented from being damaged, and the running stability and safety of the system can be ensured.

Drawings

In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments are briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without making any inventive changes.

FIG. 1 is a schematic structural diagram of a hydrogen production system by water electrolysis according to an embodiment of the present invention;

fig. 2 is a schematic view of a heater connection according to an embodiment of the present invention;

fig. 3 is a schematic view of another heater connection provided in an embodiment of the present invention;

fig. 4 is a schematic view of a connection between a heater and a steam trap according to an embodiment of the present invention;

in the figure: 1. an electrolytic cell; 2. a hydrogen side separator; 3. an oxygen side separator; 4. a heater; 5. a cooler; 6. a circulation pump; 7. a temperature detection element; 8. adjusting a valve; 9. a filter; 10. a flow meter; 12. a hydrogen mixture aftertreatment system; 13. an oxygen mixture aftertreatment system; 14. an on-off valve; 15. a steam trap; 16. a non-return valve.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

The core of the application is to provide a hydrogen production system by electrolyzing water, which can solve the problems that the starting speed of the system is low, and when the system stops running, the pipeline and equipment are easily damaged by the generated crystals, which affects the running safety in the prior art.

Fig. 1 is a schematic structural view of a hydrogen production system by water electrolysis provided in an embodiment of the present invention, fig. 2 is a schematic structural view of a heater connection provided in an embodiment of the present invention, fig. 3 is a schematic structural view of another heater connection provided in an embodiment of the present invention, and fig. 4 is a schematic structural view of a heater and a steam trap provided in an embodiment of the present invention, as shown in fig. 1 to fig. 4.

Example 1

A hydrogen production system by water electrolysis comprises an electrolytic cell 1 and a temperature detection element 7, wherein the electrolytic cell 1 is provided with at least one hydrogen side outlet, at least one oxygen side outlet and at least one electrolyte inlet. In actual operation, a plurality of electrolytic cells 1 may be provided. The hydrogen side outlet of the electrolytic cell 1 is communicated with a hydrogen side separator 2 through a hydrogen outlet pipeline, the oxygen side outlet of the electrolytic cell 1 is communicated with an oxygen side separator 3 through an oxygen outlet pipeline, the hydrogen side separator 2 is provided with at least 1 electrolyte inlet, at least 1 electrolyte outlet and at least 1 hydrogen mixture outlet, and the number of the hydrogen side separators 2 can be multiple. The oxygen side separator 3 has at least 1 electrolyte inlet, at least 1 electrolyte outlet, and at least 1 oxygen mixture outlet, and the number of the oxygen side separator 3 may be plural. One hydrogen-side separator 2 and one oxygen-side separator 3 may be connected to at least 1 electrolytic cell 1. Preferably, a communication pipeline is further arranged between the hydrogen side separator 2 and the oxygen side separator 3 to better adjust the hydrogen side pressure, the oxygen side pressure and the pressure difference of the electrolytic cell 1.

The hydrogen mixture outlet and the oxygen mixture outlet of the discharge ports of the hydrogen side separator 2 and the oxygen side separator 3 are communicated with a connecting pipeline, a heater 4, a cooler 5 and a circulating pump 6 are arranged on the connecting pipeline in series, the heater 4, the cooler 5 and the circulating pump 6 can be connected in any sequence, and preferably, the connection mode shown in fig. 1 is adopted. The other end of the connecting pipeline is communicated with an electrolyte inlet of the electrolytic cell 1, and a regulating valve 8 is arranged on a cooling medium pipeline of the cooler 5.

The temperature detection element 7 is used for detecting the temperature of the electrolyte and is matched with the regulating valve 8 of the heater 4 and the cooler 5 to accurately regulate the temperature of the electrolyte. Preferably, the temperature detection element 7 is located on the connection duct. Of course, the temperature detection element 7 may also be located on the hydrogen outlet pipe or the oxygen outlet pipe; or on the hydrogen side separator 2 equipment body and the oxygen side separator 3 equipment body; the number of the temperature detection elements 7 may be plural.

In actual operation, the number of the heaters 4 may be multiple, and multiple heaters may be connected in series or in parallel, and the following operation modes may be implemented by the heaters 4. Firstly, a quick start mode of the water electrolysis hydrogen production system: the electrolyte is heated before the start-up of the cell 1. The temperature detecting element 7 detects that the temperature of the electrolyte is lower than a first set temperature, the circulating pump 6 and the heater 4 are started to heat the electrolyte, after the set temperature is reached, the heater 4 stops heating, and the electrolytic cell 1 is started. Secondly, a low-load mode of the hydrogen production system; when the electrolytic cell 1 is operated under a low load for a long time, the electrolytic cell 1 generates heat by itself and is not enough to maintain the temperature of the electrolyte at the optimal working temperature, the electrolyte is heated, and the unit energy consumption of the electrolytic cell is reduced. The temperature detecting element 7 detects that the temperature of the electrolyte is lower than a second set temperature, the heater 4 is started to heat the electrolyte, and after the set temperature is reached, the heater 4 stops heating or operates at a lower heating power to maintain the temperature of the electrolyte. Third, hydrogen production system standby mode: when the electrolytic cell 1 is stopped, the minimum temperature of the electrolyte is maintained above the third set temperature and is generally set to not lower than 5 ℃. The temperature detecting element 7 detects that the temperature of the electrolyte is lower than a second set temperature, the heater 4 is started to heat the electrolyte, and after the set temperature is reached, the heater 4 stops heating or operates at a lower heating power to maintain the temperature of the electrolyte.

The cooler 5 is used for cooling the electrolyte, a dividing wall type heat exchanger can be selected as the cooler 5, the number of the coolers 5 in the water electrolysis hydrogen production system can be multiple, but at least one cooler 5 is provided with a regulating valve 8 at a cooling medium inlet or outlet for controlling the flow of the cooling medium flowing through the cooler 5, so that the temperature of the electrolyte can be accurately and stably controlled. The cooling medium can be circulating cooling water, glycol solution and the like. Circulating pump 6 is used for pumping electrolyte into electrolysis trough 1, and drive electrolyte is at the system inner loop, and the quantity of electrolysis water hydrogen manufacturing system inner loop 6 can be many, and many circulating pumps 6 can provide electrolyte for 1 at least electrolysis trough 1.

Example 2

A flowmeter 10 is further arranged on a connecting pipeline of the system for producing hydrogen by electrolyzing water, the flowmeter 10 can detect the circulating flow of electrolyte, the flowmeter 10 can be positioned in front of an electrolyte inlet of an electrolytic cell 1 and at any position behind a hydrogen/oxygen separator, and the flowmeter 10 can be an electromagnetic flowmeter or a rotor flowmeter.

In the embodiment of the application, an electric heating power controller is further integrated in the heater 4 or the heater 4 is a partition wall heat exchanger. The electric heater 4 may be configured with an electric heating power controller so that the heater 4 controls the temperature of the electrolyte more smoothly in the above-described third hydrogen production system standby mode and the above-described second hydrogen production system low load mode. Preferably, when the heater 4 is a partition wall heat exchanger, the heating medium inlet of the heater 4 is further provided with a regulating valve 8. If the heater 4 is a partition wall heat exchanger, it can be heated by using a medium such as steam, hot water, heat transfer oil, etc., and an on-off valve 14 is provided at the inlet or outlet of the heating medium of the partition wall heat exchanger as shown in FIG. 3, and D-31 in FIG. 3 represents a heater. Or adjusting valves, such as H-21 shown in figure 2 and H-41 shown in figure 4, to control the on-off and flow of the heating medium in the dividing wall heat exchanger, so as to control the heating rate and whether the heater 4 is heating. As shown in fig. 2, it is preferable to provide the regulating valve 8, the regulating valve H-21 is provided at the heating medium inlet of the heater D-21, and the regulating valve H-41 is provided at the heating medium inlet of the heater D-41, so that the temperature of the electrolyte can be controlled more smoothly by the heater D-21 or the heater D-41 in the third hydrogen production system standby mode and the second hydrogen production system low load mode. In operation, valves 11, such as K-21, K-31 and K-41 shown in FIGS. 2, 3 and 4, may also be provided at the heating medium inlet and heating medium outlet of the heater 4; k-22, K-32 and K-42.

Preferably, a steam trap 15 is further provided at the heating medium outlet of the heater 4. As shown in FIG. 4, if heating is performed with steam, it is preferable to provide a steam trap 15 at the heating medium outlet of the heater D-41 to save steam.

Preferably, the electrolytic water hydrogen production system is also provided with a valve on a cooling medium pipeline of the cooler 5. Specifically, valves are arranged at the cooling medium inlet and outlet of the cooler 5, such as K-1 and K-2 shown in figure 1, and the regulating valve 8 is positioned between the cooler 5 and the cooling medium inlet valve K-1 or the cooling medium outlet valve K-2, so that the cooler 5 or the regulating valve 8 is isolated from a cooling medium supply system during fault maintenance.

In the embodiment of the application, the device also comprises a check valve which is positioned between the circulating pump 6 and the electrolytic tank 1 or is positioned in front of the inlet of the circulating pump 6. When more than 1 electrolytic cell 1 or more than 1 circulating pump 6 or both of them are present in the water electrolysis hydrogen production system, a check valve can be arranged between the circulating pump 6 and the inlet of the electrolytic cell 1 or in front of the inlet of the circulating pump 6. The electrolyte is prevented from flowing backward in the electrolytic bath 1 and the circulation pump 6. The outlet of the circulation pump F-1 shown in fig. 1 is provided with a non-return valve P-1.

In the embodiment of the present application, the method further includes: a filter 9 arranged on the connecting pipe for filtering impurities in the electrolyte from entering the electrolytic cell 1, the circulation pump 6, the flow meter 10, clogging or damaging the equipment, preferably before the inlet of the circulation pump 6, after the hydrogen/oxygen separator, as shown in fig. 1. The position of the connecting pipeline at the filter 9 is also provided with a bypass pipeline, and valves are arranged on an inlet, an outlet and the bypass pipeline of the filter 9. As shown in figure 1, valves K-3 and K-4 are arranged at the inlet and the outlet of the filter 9, and a bypass pipeline is arranged at the same time and is directly communicated with a front pipeline of the inlet valve K-3 of the filter 9 and a rear pipeline of the outlet valve K-4 of the filter 9, and a valve K-5 is arranged on the bypass pipeline. For cleaning the filter 9 when the water electrolysis hydrogen production system is in operation. When the filter works normally, the bypass pipeline valve K-5 of the filter 9 is closed, and the inlet and outlet valves K-3 and K-4 of the filter 9 are opened. When the filter 9 is cleaned, the bypass pipeline valve K-5 of the filter 9 is opened, then the inlet and outlet valves K-3 and K-4 of the filter 9 are closed, the filter 9 is opened, and the filter element of the filter 9 is cleaned or replaced. Then opening the inlet and outlet valves K-3 and K-4 of the filter 9, closing the bypass pipeline valve K-5 of the filter 9 and returning to normal.

Preferably, an exhaust duct is further provided at the inlet or outlet of the filter 9, and a valve is provided on the exhaust duct. As shown in FIG. 1, an exhaust pipeline with a valve K-6 is arranged on the top of the filter 9 or at the high point of the pipeline between the inlet valve K-3 and the outlet valve K-4 of the filter. For exhausting the gas in the filter 9 and the pipeline after the filter 9 is overhauled.

Of course, in practical use, more than two filters 9 may be provided, and for example, two filters 9 may be connected in parallel, and each of the filter inlets and outlets may be provided with a valve, so that the two filters may be switched when the apparatus is in operation.

The water electrolysis hydrogen production system has the working principle that when the system is used, a hydrogen-containing gas-liquid mixture flows out of a hydrogen side outlet of an electrolytic cell 1 and enters a hydrogen side separator 2; the oxygen-containing liquid mixture flows out of the oxygen side of the electrolytic cell 1 and enters an oxygen side separator 3; the temperature detecting element 7 detects the temperature of the electrolyte mixture discharged from the electrolytic cell 1. The electrolyte separated by the hydrogen side separator 2 and the oxygen side separator 3 is converged into the heater 4, then enters the cooler 5, is removed of impurities possibly existing through the filter 9, is detected by the flowmeter 10 for the electrolyte flow, then enters the circulating pump 6, and is pumped into the electrolyte inlet of the electrolytic cell 1. The heater 4 can heat the electrolyte, the temperature detection element 7 detects the temperature of the electrolyte, and when the temperature of the electrolyte is lower than a set value, the heater 4 is started to heat the electrolyte; when the electrolyte temperature reaches or exceeds the set value, the heater 4 is stopped, or the heating load is reduced. The cooler 5 controls the flow of the cooling medium through the cooler 5 by means of the regulating valve 8, thereby controlling the heat exchange duty of the cooler 5. The temperature of the electrolyte in the water electrolysis hydrogen production system can be accurately and stably regulated. The hydrogen mixture separated by the hydrogen side separator 2 enters a hydrogen mixture post-treatment system 12 for post-treatment; the oxygen mixture separated by the oxygen side separator 3 enters an oxygen mixture post-treatment system 13 for post-treatment.

In actual operation, when the hydrogen-side separator 2 is plural, a hydrogen-side separator group is constituted; when the number of the oxygen-side separators 3 is plural, an oxygen-side separator group is constituted. A communicating pipe is connected between the hydrogen-side separators 2 in the hydrogen-side separator group at the bottom, and a communicating pipe is connected between the oxygen-side separators 3 in the oxygen-side separator group at the bottom. The hydrogen side separator group and the oxygen side separator group are connected with a communicating pipeline at the bottom. One separator can be connected with more than or equal to 1 electrolytic cell 1.

If the number of the electrolytic cells contained in the large-scale water electrolysis hydrogen production system is large, and the change of the operation load of the water electrolysis hydrogen production system is large, more than or equal to 2 coolers 5 can be selected to be connected in series or in parallel, each cooler 5 is provided with a regulating valve 8 at a cooling medium inlet or outlet, and the regulating valves 8 of the two coolers 5 can adopt a split-range control mode, so that the temperature of the electrolyte in the system can be more accurately and stably controlled when the operation load of the water electrolysis hydrogen production system is regulated in a large range. 2 or more than 2 circulating pumps 6 can be combined into 1 group, and the inlets and outlets of the circulating pumps 6 are connected in parallel. Under normal working conditions, 1 circulating pump 6 runs in the 1 group of circulating pumps 6, and the rest are stopped for standby. The 1 group of circulating pumps 6 can provide electrolyte for the plurality of electrolytic cells 1, the outlet of the 1 group of circulating pumps 6 is connected with the electrolyte inlet of the electrolytic cell 1 which is more than or equal to 1, and the electrolytic water hydrogen production system can be internally provided with the circulating pumps 6 which are more than or equal to 1. Valves are arranged in front of or behind each circulating pump 6, or valves are arranged in front of and behind the circulating pumps, such as K-7, K-8, K-9 and K-10 shown in figure 1, so that the running states of the circulating pumps 6 can be switched, and the maintenance and isolation are convenient. The valve can be a manual valve or an automatic control valve, is preferably a ball valve, and has the functions of excellent sealing effect and small resistance.

The operation mode of the large-scale water electrolysis hydrogen production system is as follows:

the electrolyte can be supplied to 1 electrolytic cell 1 by 1 circulating pump 6; or more than or equal to 1 electrolytic cell can be supplied by 1 group of circulating pumps 6, 1 working in the group of circulating pumps 6 and the rest for standby; more than or equal to 1 electrolytic cell can be supplied by 1 circulating pump 6. 1 electrolytic cell 1 can be connected with 1 hydrogen side separator 2 and 1 oxygen side separator 3; more than 1 electrolytic cell 1 may be connected to 1 hydrogen- side separator 2 and 1 oxygen-side separator 3. There may be > 1 heater 4 in the system, either in parallel or in series. The system can have more than 1 cooler 5, can be connected in series or in parallel, and at least 1 cooler 5 has a regulating valve 8 at the cooling medium inlet/outlet. The filter 9 can be configured in the system more than or equal to 1 and can be configured in parallel.

The electrolyte is heated by the heater 4, so that the electrolyte can be heated before the electrolytic cell 1 is started, the electrolyte is heated when the electrolytic cell 1 runs for a long time under a low load, and the electrolyte is maintained at the lowest temperature when the electrolytic cell 1 stops running. And then can improve electrolysis hydrogen manufacturing system start-up speed, prevent that electrolyte temperature from crossing excessively and producing solid crystallization, damage equipment and pipeline in the system, ensure that electrolyte temperature control is steady, accurate, system operation stability and security.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice in the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope of the disclosure being indicated by the following claims.

It will be understood that the present application is not limited to the precise arrangements that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The above-described embodiments of the present application do not limit the scope of the present application.

Claims (11)

1. A system for producing hydrogen by electrolyzing water, comprising:

electrolytic cell (1) and temperature detect element (7), the export of the hydrogen side of electrolytic cell (1) has hydrogen side separator (2) through going out hydrogen pipeline intercommunication, the export of the oxygen side of electrolytic cell (1) has oxygen side separator (3) through going out oxygen pipeline intercommunication, hydrogen side separator (2) with the common intercommunication of discharge gate department of oxygen side separator (3) has the connecting tube, the last series connection of connecting tube is provided with heater (4), cooler (5) and circulating pump (6), the other end of connecting tube with the electrolyte entry intercommunication of electrolytic cell (1), be provided with governing valve (8) on the coolant pipeline of cooler (5).

2. The system for producing hydrogen by electrolyzing water as recited in claim 1, wherein a flow meter (10) is further provided on the connecting pipe.

3. System for producing hydrogen by electrolyzing water according to claim 1, characterized in that a communication pipe is further provided between the hydrogen side separator (2) and the oxygen side separator (3).

4. System for the production of hydrogen by electrolysis of water according to claim 1, characterized in that the temperature detection element (7) is located on the connection pipe.

5. Water electrolysis hydrogen production system according to claim 1, characterized in that the heater (4) is also integrated with an electric heating power controller or the heater (4) is a partition wall heat exchanger.

6. Hydrogen production system according to claim 5, wherein when the heater (4) is a partition wall heat exchanger, the regulating valve (8) is further provided at the heating medium inlet of the heater (4).

7. Water electrolysis hydrogen production system according to claim 6, wherein a steam trap (15) is further provided at the heating medium outlet of the heater (4).

8. Hydrogen production system by electrolysis of water according to claim 1, characterized in that the number of said heater (4), said cooler (5) and said circulation pump (6) is plural.

9. System for hydrogen production by electrolysis of water according to claim 1, characterized by further comprising a non-return valve located between the circulation pump (6) and the electrolysis cell (1) or before the inlet of the circulation pump (6).

10. The system for producing hydrogen by electrolyzing water as recited in claim 1, further comprising:

the filter is characterized in that the filter (9) is arranged on the connecting pipeline, the connecting pipeline is positioned at the position of the filter (9) and is also provided with a bypass pipeline, and valves are arranged on an inlet and an outlet of the filter (9) and the bypass pipeline.

11. The system for producing hydrogen by electrolyzing water as described in claim 10, wherein an exhaust duct is further provided at the inlet or outlet of the filter (9), and the valve is provided on the exhaust duct.

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