CN218893742U - Water electrolysis hydrogen production device and system - Google Patents

Abstract

The utility model relates to the technical field of hydrogen preparation, and discloses a water electrolysis hydrogen production device and system. The electrolytic water hydrogen production device comprises an electrolytic tank, a hydrogen side separator, an oxygen side separator, a heat exchanger, a flowmeter and a variable frequency circulating pump, wherein the discharge end of the electrolytic tank is communicated with the oxygen side separator through an oxygen outlet pipe, the discharge end of the electrolytic tank is communicated with the hydrogen side separator through a hydrogen outlet pipe, the discharge ends of the hydrogen side separator and the oxygen side separator are respectively provided with a discharge pipe, the other ends of the two discharge pipes are jointly communicated with the head end of a main circulating pipe, the tail end of the main circulating pipe is communicated with the feed end of the electrolytic tank, and the heat exchanger, the flowmeter and the variable frequency circulating pump are connected in series on the main circulating pipe. Through the arrangement, the utility model can realize the accurate control of the flow of the electrolyte in the electrolytic water hydrogen production device, and can avoid the phenomenon that valve internals are washed by high-temperature alkali liquor in the prior art.

Description

Water electrolysis hydrogen production device and system

Technical Field

The utility model relates to the technical field of hydrogen preparation, in particular to a device and a system for producing hydrogen by water electrolysis.

Background

The electrolytic water hydrogen production device mainly comprises an electrolytic tank, a hydrogen side separator, an oxygen side separator, an electrolyte circulating pump, an electrolyte cooler and the like. When the electrolyzer is connected with a working power supply, the hydrogen-containing liquid mixture is discharged from a hydrogen side outlet of the electrolyzer and enters a hydrogen side separator; the oxygen-containing gas mixture exits the oxygen side outlet of the electrolyzer and enters the oxygen side separator. The electrolyte separated by the hydrogen side separator and the oxygen side separator is cooled by an electrolyte cooler and pumped into the electrolytic tank by a circulating pump. The hydrogen mixture separated by the hydrogen side separator is subjected to dealkalization, dehydration, cooling and the like, and the oxygen mixture separated by the oxygen side separator is subjected to dealkalization, dehydration, cooling and the like.

In the electrolytic water hydrogen production device, the control of the circulation flow of the electrolyte is very important, the separation effect of the separator is directly affected, the whole equipment is safe to work, and the like. In the prior art, the working flow of the circulating pump and the pressure head are fixed, and in general, when the circulating pump is configured in a selected mode, the rated flow is larger than the electrolyte flow under the optimal working condition of the electrolytic hydrogen production system, and in actual production, the circulating amount of the electrolyte is controlled in a reasonable interval generally through the opening of an outlet valve of the circulating pump. The valve internals are seriously eroded and corroded by high-temperature alkali liquor, the valve rod is frequently operated, and leakage of the alkali liquor from the sealing part of the valve rod generally occurs. The valve maintenance amount is large and the loss is high.

Disclosure of Invention

In view of the above problems, the embodiment of the utility model provides a device and a system for producing hydrogen by electrolyzing water, which can accurately control the flow of electrolyte circulation and can avoid the phenomenon that valve internals are washed by high-temperature alkali liquor.

According to one aspect of an embodiment of the present utility model, there is provided a water electrolysis hydrogen production apparatus. The electrolytic water hydrogen production device comprises an electrolytic tank, a hydrogen side separator, an oxygen side separator, a heat exchanger, a flowmeter and a variable frequency circulating pump, wherein the discharge end of the electrolytic tank is communicated with the oxygen side separator through an oxygen outlet pipe, the discharge end of the electrolytic tank is communicated with the hydrogen side separator through a hydrogen outlet pipe, the discharge ends of the hydrogen side separator and the oxygen side separator are both provided with discharge pipes, the other ends of the discharge pipes are jointly communicated with the head end of a total circulating pipe, the tail end of the total circulating pipe is communicated with the feed end of the electrolytic tank, and the heat exchanger, the flowmeter and the variable frequency circulating pump are connected in series on the total circulating pipe.

In some embodiments, the variable frequency circulation pump is a variable frequency canned motor pump or a variable frequency magnetic pump.

In some embodiments, the filter assembly is connected in series with the circulation tube, the filter assembly is two filters connected in parallel with each other through a pipeline or the filter assembly is one service valve and one filter connected in parallel through a pipeline.

In some embodiments, the heat exchanger, the filter bank, and the variable frequency circulation pump are disposed sequentially along a head end of the total circulation pipe toward a tail end of the total circulation pipe.

In some embodiments, at least one temperature sensing element is included.

In some embodiments, the flowmeter is an electromagnetic flowmeter or a rotameter.

In some embodiments, the system comprises a plurality of circulating pumps, at least one of the plurality of circulating pumps is a variable frequency circulating pump, the plurality of circulating pumps are connected in parallel to form a circulating pump set, the circulating pump set is connected in series on a total circulating pipe, and each of the plurality of circulating pumps in a branch of the circulating pump set is connected in series with a check valve which is independent.

In some embodiments, the electrolytic cells are a plurality of electrolytic cells connected in parallel with each other.

In some embodiments, the hydrogen side separator and the oxygen side separator bottoms are in communication via a communication conduit.

Based on the above-mentioned electrolytic water hydrogen production device, another aspect of the utility model provides an electrolytic water hydrogen production system, which comprises a plurality of electrolytic tank groups and a plurality of circulating pump groups, wherein the electrolytic tank groups at least comprise one electrolytic tank, the plurality of electrolytic tank groups are mutually connected in parallel, the circulating pump groups at least comprise one circulating pump, the plurality of circulating pump groups at least comprise one variable frequency circulating pump, the plurality of circulating pump groups are correspondingly arranged with the plurality of electrolytic tank groups, and when more than one electrolytic tank groups operate and the rest electrolytic tank groups stop, the circulating pump groups corresponding to the stopped electrolytic tank groups operate in a down-conversion mode.

The beneficial effects in this application are: the application shows an electrolytic water hydrogen production device, which is provided with a variable frequency circulating pump for pumping electrolyte into an electrolytic tank and driving the electrolyte to circulate in the electrolytic water hydrogen production device. At least 1 circulating pump in the electrolytic water hydrogen production device is a variable frequency pump, and the flow rate, the pressure head and the like of the variable frequency pump can be adjusted. The flow of the variable-frequency circulating pump can be regulated by setting parameters of a frequency converter, and a control loop can also be formed by the variable-frequency circulating pump and a flowmeter, so that the automatic control of the set flow is realized. Because the variable frequency circulating pump does not need to adjust the flow through the valve, the condition that the valve is corroded does not exist, and the condition that alkali liquor leaks from the sealing position of the valve rod does not exist naturally. The variable-frequency circulating pump and the flowmeter can form a control loop, and the electrolyte flow can be controlled more sensitively and automatically under the assistance of a PLC or DCS control system, so that the electrolyte flow in the electrolytic water hydrogen production device is always kept in an optimal state, and the working efficiency of the whole system is fully ensured. Based on the electrolytic water hydrogen production device, the utility model also provides an electrolytic water hydrogen production system with the same effects.

The foregoing description is only an overview of the present utility model, and is intended to be implemented in accordance with the teachings of the present utility model in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present utility model more readily apparent.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

FIG. 1 is an overall schematic diagram of a water electrolysis hydrogen plant provided in an embodiment of the present application;

FIG. 2 is a schematic diagram of an electrolytic water hydrogen plant with multiple circulation pumps provided in an embodiment of the present application;

FIG. 3 is a schematic diagram of a water electrolysis hydrogen production system provided in an embodiment of the present application.

Reference numerals in the specific embodiments are as follows:

an electrolytic tank 1, a hydrogen side separator 2, an oxygen side separator 3, a heat exchanger 4, a flow meter 5, a circulation pump 6, a temperature detecting element 7, a filter 8, a valve 9, a check valve 10, a total circulation pipe 11, an inspection valve 12, and a communication pipe 13.

Detailed Description

Embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical solutions of the present application, and thus are only examples, and are not intended to limit the scope of protection of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions.

The electrolytic water hydrogen production device mainly comprises an electrolytic tank, a hydrogen side separator, an oxygen side separator, an electrolyte circulating pump, an electrolyte cooler and the like. When the electrolyzer is connected with a working power supply, the hydrogen-containing liquid mixture is discharged from a hydrogen side outlet of the electrolyzer and enters a hydrogen side separator; the oxygen-containing gas mixture exits the oxygen side outlet of the electrolyzer and enters the oxygen side separator. The electrolyte separated by the hydrogen side separator and the oxygen side separator is cooled by an electrolyte cooler and pumped into the electrolytic tank by a circulating pump to complete circulation. The hydrogen mixture separated by the hydrogen side separator is subjected to dealkalization, dehydration, cooling and the like, and the oxygen mixture separated by the oxygen side separator is subjected to dealkalization, dehydration, cooling and the like. In an electrolytic water hydrogen production device, the control of the circulation flow of electrolyte is very important, and is mainly characterized in the following aspects:

1. the separation effect of the separator is affected, the circulation flow of the electrolyte is overlarge, the hydrogen side separator and the oxygen side separator can not completely separate hydrogen, oxygen and the electrolyte, the unseparated hydrogen and oxygen can circulate and meet along with the electrolyte, the oxygen content in the hydrogen is finally caused, the hydrogen content in the oxygen exceeds the standard, and explosion can be generated under extreme conditions, so that the safety production is threatened.

2. If the electrolyte circulation flow is too large, the diaphragm of the electrolytic cell can be damaged.

3. If the circulation flow of the electrolyte is too small, heat generated in the working process of the electrolytic tank cannot be taken out by the electrolyte in time, so that the electrolytic tank is overtemperature, equipment can be damaged when serious, or the temperature distribution inside the electrolytic tank can be uneven, and the electrolytic efficiency of the electrolytic tank is reduced.

Specifically, in order to accurately control the flow of electrolyte in the water electrolysis hydrogen production device and avoid the phenomenon that valve internals are washed by high-temperature alkali liquor, the application shows a water electrolysis hydrogen production device. Referring to fig. 1, fig. 2 and fig. 3, fig. 1 is an overall schematic diagram of an electrolytic water hydrogen production device provided in an embodiment of the present application, fig. 2 is a schematic diagram of an electrolytic water hydrogen production device provided in an embodiment of the present application and having a plurality of variable frequency circulation pumps, fig. 3 is a schematic diagram of an electrolytic water hydrogen production system provided in an embodiment of the present application, and fig. 3 is a schematic diagram of an electrolytic water hydrogen production system provided in an embodiment of the present application; a-21 to A-25 are electrolytic tanks, B-21 to B-24 are hydrogen side separators, C-21 to C-24 are oxygen side separators, D-21 and D-22 are heat exchangers, E-21 to E-24 are flow meters, F-21 to F-24 are circulation pumps, G-21 to G-29 are temperature detecting elements, H-21 and H22 are filters, I-21-I-35 are valves, J-21 to J-24 are check valves. The electrolytic water hydrogen production device comprises an electrolytic tank 1, a hydrogen side separator 2, an oxygen side separator 3, a heat exchanger 4, a flowmeter 5 and a variable frequency circulating pump 6, wherein the flowmeter 5 is an electromagnetic flowmeter or a rotameter. The discharge end of the electrolytic tank 1 is communicated with the oxygen side separator 3 through an oxygen outlet pipe, the discharge end of the electrolytic tank 1 is communicated with the hydrogen side separator 2 through a hydrogen outlet pipe, the discharge ends of the hydrogen side separator 2 and the oxygen side separator 3 are respectively provided with a discharge pipe, the other ends of the two discharge pipes are jointly communicated with the head end of the total circulating pipe 11, the tail end of the total circulating pipe 11 is communicated with the feeding end of the electrolytic tank 1, and the total circulating pipe 11 is connected with the heat exchanger 4, the flowmeter 5 and the variable-frequency circulating pump 6 in series.

The electrolyzer 1 has at least one hydrogen side outlet, at least one oxygen side outlet, and at least one electrolyte inlet. The hydrogen side outlet of the electrolytic tank 1 is connected with the electrolyte inlet of the hydrogen side separator 2 through a pipeline; the oxygen side outlet of the electrolytic tank 1 and the electrolyte inlet of the oxygen side separator 3 are connected by a pipe. The number of the electrolytic tanks 1 in the water electrolysis hydrogen production device is more than or equal to 1.

The hydrogen side separator 2 is provided with at least one electrolyte inlet, at least 1 electrolyte outlet and at least 1 hydrogen mixture outlet, and the number of the hydrogen side separators 2 is more than or equal to 1. The oxygen side separator 3 has at least 1 electrolyte inlet, at least 1 electrolyte outlet, at least 1 oxygen mixture outlet, and the number of the oxygen side separators 3 is more than or equal to 1. If there are > 1 hydrogen side separators 2, a hydrogen side separator group is constituted; if there are > 1 oxygen side separators 3, an oxygen side separator group is constituted. The hydrogen side separators 2 in the hydrogen side separator group may be connected by a communication pipe 13 provided at the bottom, and the oxygen side separators 3 in the oxygen side separator group may be connected by a communication pipe 13 provided at the bottom. The hydrogen side separator group and the oxygen side separator group may be provided with a communication pipe 13 at the bottom. An oxygen side separator group or a hydrogen side separator group 2 may be connected to 1 or more electrolytic cells 1.

The heat exchanger 4 is used for controlling the temperature of the electrolyte, and can heat or cool the electrolyte, so that the temperature of the electrolyte is ensured to be in a reasonable range (the temperature at the outlet of the electrolytic tank 1 needs to be ensured to be 90+/-5 ℃, and the temperature at the inlet needs to be ensured to be 70+/-5 ℃, so that the heat exchanger 4 plays a role in cooling under the general condition). The heat exchanger 4 may be located after the electrolyte outlets of the hydrogen side separator 2 and the oxygen side separator 3. Or may be located on the connection line from the oxygen side outlet of the electrolyzer 1 to the oxygen side separator 3; or may be located on the electrolyte outlet line of the hydrogen side separator 2/oxygen side separator 3 or on the total circulation pipe 11; the heat exchangers 4 can be positioned at other positions of the electrolyte circulation pipeline or at any combination of more than 1 position, the number of the heat exchangers is more than or equal to 1, and the specific positions are not limited.

The variable-frequency circulating pump 6 is used for pumping electrolyte into the electrolytic tank 1 and driving the electrolyte to circulate in the electrolytic water hydrogen production device. At least 1 circulating pump in the electrolytic water hydrogen production device is a variable frequency circulating pump 6, and the flow rate, the pressure head and the like of the variable frequency circulating pump can be adjusted. The flow of electrolyte in the variable frequency circulating pump 6 can be regulated by setting parameters of a frequency converter, and a control loop can also be formed with the flowmeter 5, so that the automatic control of the set flow is realized. Because the variable frequency circulating pump 6 can not need to adjust the flow through the valve 9, the condition that the valve 9 is corroded does not exist, and the condition that alkali liquor leaks from the valve rod sealing position of the valve 9 does not exist naturally. And the variable frequency circulating pump 6 and the flowmeter 5 can form a control loop, and more sensitive and automatic regulation and control are realized under the assistance of a PLC or DCS control system and the like, so that the flow of electrolyte in the water electrolysis hydrogen production device is always kept in an optimal state, and the working efficiency of the whole system is fully ensured.

In some embodiments, variable frequency circulation pump 6 is a variable frequency canned motor pump or a variable frequency magnetic pump.

When the water electrolysis hydrogen production device works normally, the temperature of the electrolyte is higher (generally 50-95 ℃), the corrosiveness is strong, and meanwhile, the electrolyte has a certain pressure (generally 1.6 MPa). Preferably, a variable frequency shielding pump, a variable frequency magnetic pump and the like are used, and the variable frequency shielding pump and the variable frequency magnetic pump have good seepage prevention function and can effectively prevent electrolyte from leaking out of a pump body.

In some embodiments, please refer to fig. 2, further comprising a filter set, the filter set being connected in series on the circulation pipe, the filter set being two filters 8 connected in parallel to each other by pipes or the filter set being one service valve 12 and one filter 8 connected in parallel by pipes. The filter 8 is used for filtering impurities in the electrolyte and preventing the impurities from entering the electrolytic tank 1, the variable frequency circulating pump 6, the flowmeter 5 and the like to cause blockage or equipment damage, and is preferably positioned before the inlet of the variable frequency circulating pump 6 and after the hydrogen side separator 2/oxygen side separator 3 (as in the position of the filter 8 in fig. 2). The head end of the variable frequency circulating pump 6 and/or the tail end of the variable frequency circulating pump 6 can be provided with a flow valve, and a mode for controlling the flow of electrolyte can be added through the flow valve. The location and number of the filters 8 are not limited. The following two alternatives are provided with respect to the arrangement of the filter 8.

Alternative one: as shown in fig. 3, more than two filters 8 are connected in parallel, and each filter 8 inlet and outlet is provided with a valve 9 so that the filters 8 can be switched when the apparatus is running. Cleaning maintenance is performed (e.g., filters H-21, H-22 inlet, outlet are connected in parallel in FIG. 3).

Alternative II: as shown in fig. 2, valves 9 (I-1, I-2 in fig. 2) are arranged at the inlet and the outlet of the filter 8, and a jumper is arranged, and is directly communicated with the front pipeline of the inlet valve of the filter 8 and the rear pipeline of the outlet valve of the filter 8, and an overhaul valve 12 is arranged on the jumper, so that the filter 8 and the overhaul valve 12 are connected in parallel in the above manner. For cleaning the filter 8 when the electrolytic water hydrogen plant is in operation. In normal operation, the service valve 12 is closed and the inlet and outlet valves (I-1, I-2 in FIG. 2) of the filter 8 are opened. When the filter 8 is cleaned, the overhaul valve 12 is opened, then the inlet and outlet valves (I-1 and I-2 in fig. 2) of the filter 8 are closed, the filter 8 is disassembled, after the filter element of the filter 8 is cleaned or replaced, the inlet and outlet valves (I-1 and I-2 in fig. 2) of the filter 8 are opened, and then the overhaul valve 12 is closed, so that the normal operation can be restored.

In some embodiments, the heat exchanger 4, the filter bank, and the variable frequency circulation pump 6 are disposed in sequence along the head end of the total circulation pipe 11 toward the tail end of the total circulation pipe 11. Through actual measurement, under the connection sequence, the overall operation efficiency of the system is higher, and the failure rate is low.

In some embodiments, at least one temperature sensing element 7 is included.

The temperature detecting element 7 is for detecting the electrolyte temperature. The number of the temperature detecting elements 7 is not limited by, but is not limited by, preferably, the connecting line from the hydrogen side outlet of the electrolytic tank 1 to the electrolyte inlet of the hydrogen side separator 2 (as G-1 in FIG. 2) or the connecting line from the oxygen side outlet of the electrolytic tank 1 to the electrolyte inlet of the oxygen side separator 3 (as G-2 in FIG. 3), or the connecting line may be located on the hydrogen side separator 2 equipment body, the oxygen side separator 3 equipment body, or other positions of the total circulating pipe 11, or any combination of the above.

In some embodiments, please continue to refer to fig. 3, which includes a plurality of circulation pumps, at least one of which is a variable frequency circulation pump 6. The circulating pumps are connected in parallel and then are connected in series on the total circulating pipe 11, and each circulating pump is connected in series with a check valve 10 which is independent.

2 or more than 2 circulating pumps are formed into 1 group, at least one of them is a variable frequency circulating pump 6, and the pump-out and inlet of each circulating pump are connected in parallel. And under normal working conditions, 1 circulating pump is arranged in the 1 group of circulating pumps to run, and the rest circulating pumps are stopped for standby. The 1 group of circulating pumps can provide electrolyte for a plurality of electrolytic tanks 1, the outlets of the 1 group of circulating pumps are connected with electrolyte inlets of more than or equal to 1 electrolytic tank 1 (as shown in figure 3, the circulating pump groups F-22 and F-23 are simultaneously connected with 2 electrolytic tanks A-22 and A-23), and more than 1 group of electrolyte circulating pumps can be arranged in the electrolytic water hydrogen production device (as shown in figure 3, the circulating pumps F-21 are in a first group, the circulating pumps F-22 and F-23 are in a second group, and the circulating pumps F-24 are in a third group). The valves 9 are arranged before or after each circulating pump, or the valves 9 are arranged before or after each circulating pump, so that the running states of a plurality of circulating pumps can be switched (such as valves I-5, I-6, I-7 and I-8 are arranged before or after the circulating pumps F-1 and F-2 in FIG. 2), and the maintenance and isolation are convenient. When more than 1 electrolytic tank 1 or more than 1 circulating pump are arranged in the electrolytic water hydrogen production device (or the two are satisfied), a check valve 10 can be arranged between the circulating pump and the inlet of the electrolytic tank 1 or before the inlet of the circulating pump. The electrolyte is prevented from flowing back in the electrolytic tank 1 and the circulating pump (as in fig. 2, a check valve J-1 is arranged behind the circulating pump F-1, and a check valve J-2 is arranged behind the circulating pump F-2).

In some embodiments, the electrolytic cells 1 are plural, and the plural electrolytic cells 1 are connected in parallel with each other.

When the power supply is insufficient, the whole operation of the electrolytic tank 1 of the water electrolysis hydrogen production device cannot be ensured, more than or equal to 1 electrolytic tank 1 (A-21 and/or A-22 and/or A-23 and/or A-24 and/or A-25 in FIG. 3) is stopped. At this time, the frequency conversion circulating pump 6 corresponding to the stopped electrolytic tank 1 can be operated in a frequency-reducing mode, electrolyte with higher temperature in the electrolytic water hydrogen production device passes through the stopped electrolytic tank 1 at a lower flow rate so as to maintain the temperature in the electrolytic tank 1, and the electrolytic tank 1 can be conveniently and quickly started up and operated at any time (the temperature of the electrolyte inlet of the electrolytic tank 1 needs to be maintained at 70+/-5 ℃ in the working process). In addition, because the stopped electrolytic tank 1 can emit certain heat flowing through the electrolyte, the electrolyte in the working electrolytic tank 1 can play a role in cooling to a certain degree when passing through the stopped electrolytic tank 1 at a low flow rate, thereby reducing the heat exchange load of the heat exchanger 4 and saving energy consumption.

In some embodiments, referring to fig. 2, the hydrogen side separator 2 and the oxygen side separator 3 are in bottom communication via a communication conduit 13.

The bottom of the hydrogen side separator 2 and the bottom of the oxygen side separator 3 are provided with a communication pipeline 13. To better adjust the hydrogen side pressure, the oxygen side pressure and the pressure difference of the electrolytic tank 1.

Referring to fig. 3, according to another aspect of the present utility model, an electrolyzed water hydrogen production system is provided, which includes a plurality of electrolyzer sets and a plurality of circulating pump sets, wherein the electrolyzer sets include at least one electrolyzer, the plurality of electrolyzer sets are connected in parallel, the circulating pump sets include at least one circulating pump, the plurality of circulating pump sets include at least one variable frequency circulating pump, the plurality of circulating pump sets are disposed corresponding to the plurality of electrolyzer sets, and when more than one electrolyzer sets are operated and the rest electrolyzer sets are stopped, the circulating pump sets corresponding to the stopped electrolyzer sets are operated in a down-conversion manner. At least one variable-frequency circulating pump is arranged in the water electrolysis hydrogen production system, and the action and the beneficial effects are the same as those of the variable-frequency circulating pump, and the details are not repeated here.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; while the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the embodiments, and are intended to be included within the scope of the claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (10)

1. The utility model provides an electrolytic water hydrogen plant, its characterized in that includes electrolysis trough, hydrogen side separator, oxygen side separator, heat exchanger, flowmeter and variable frequency circulating pump, the discharge end of electrolysis trough pass through go out the oxygen pipe communicate in oxygen side separator, the discharge end of electrolysis trough pass through go out the hydrogen pipe communicate in hydrogen side separator, hydrogen side separator with the discharge end of oxygen side separator all is provided with the discharging pipe, two the other end intercommunication of discharging pipe has the head end of total circulating pipe jointly, the tail end of total circulating pipe communicate in the pan feeding end of electrolysis trough, it has heat exchanger, flowmeter and variable frequency circulating pump to establish ties on the total circulating pipe.

2. The apparatus for producing hydrogen by water electrolysis according to claim 1, wherein the variable frequency circulating pump is a variable frequency canned motor pump or a variable frequency magnetic pump.

3. The apparatus for producing hydrogen from electrolyzed water according to claim 1, further comprising a filter group connected in series on the circulation pipe, the filter group being two filters connected in parallel with each other through a pipe or the filter group being one service valve and one filter connected in parallel through a pipe.

4. A water electrolysis hydrogen plant according to claim 3, wherein the heat exchanger, the filter group and the variable frequency circulation pump are disposed in this order along the head end of the total circulation pipe toward the tail end of the total circulation pipe.

5. The apparatus for producing hydrogen from water by electrolysis of water as claimed in claim 1, comprising at least one temperature sensing element.

6. The apparatus for producing hydrogen by electrolysis of water according to claim 1, wherein the flow meter is an electromagnetic flow meter or a rotameter.

7. The apparatus for producing hydrogen by water electrolysis according to claim 1, comprising a plurality of circulating pumps, wherein at least one of the plurality of circulating pumps is the variable frequency circulating pump, a plurality of circulating pumps are connected in parallel to each other to form a circulating pump group, the circulating pump group is connected in series with the total circulating pipe, and a plurality of circulating pumps in a branch of the circulating pump group are connected in series with respective independent check valves.

8. The apparatus for producing hydrogen by electrolysis of water according to claim 1, wherein a plurality of the electrolytic cells are provided, and a plurality of the electrolytic cells are connected in parallel with each other.

9. The apparatus for producing hydrogen by electrolyzing water as claimed in claim 1, wherein the hydrogen side separator and the oxygen side separator are connected at bottoms thereof by a communication pipe.

10. An electrolyzed water hydrogen production system based on the electrolyzed water hydrogen production device as set forth in any one of claims 1-9, characterized in that the system comprises a plurality of electrolyzer groups and a plurality of circulating pump groups, wherein the electrolyzer groups at least comprise one electrolyzer, a plurality of electrolyzer groups are mutually connected in parallel, the circulating pump groups at least comprise one circulating pump, at least comprise one variable frequency circulating pump, a plurality of circulating pump groups are arranged corresponding to a plurality of electrolyzer groups, and when more than one electrolyzer group operates and the rest of electrolyzer groups are stopped, the circulating pump groups corresponding to the stopped electrolyzer groups operate in a down-conversion mode.

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