CN115369421A

CN115369421A - Water electrolysis hydrogen production device and system

Info

Publication number: CN115369421A
Application number: CN202211151297.2A
Authority: CN
Inventors: 刘飞
Original assignee: Ningxia Baofeng Energy Group Co ltd
Current assignee: Ningxia Baofeng Energy Group Co ltd
Priority date: 2022-09-21
Filing date: 2022-09-21
Publication date: 2022-11-22

Abstract

The invention relates to the technical field of hydrogen production, and discloses a device and a system for producing hydrogen by electrolyzing water. The electrolytic water hydrogen production device comprises an electrolytic bath, 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 bath is communicated with the oxygen side separator through an oxygen outlet pipe, the discharge end of the electrolytic bath 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 feeding end of the electrolytic bath, and the heat exchanger, the flowmeter and the variable frequency circulating pump are connected on the main circulating pipe in series. Through the arrangement, the flow of the electrolyte in the water electrolysis hydrogen production device can be accurately controlled, and the phenomenon that the valve internal part is washed by high-temperature alkali liquor in the prior art can be avoided.

Description

Water electrolysis hydrogen production device and system

Technical Field

The invention relates to the technical field of hydrogen preparation, in particular to a device and a system for preparing hydrogen by electrolyzing water.

Background

The water electrolysis hydrogen production device mainly comprises an electrolytic bath, a hydrogen side separator, an oxygen side separator, an electrolyte circulating pump, an electrolyte cooler and the like. When the electrolytic cell is connected with a working power supply, a hydrogen-containing gas-liquid mixture flows out from the hydrogen side outlet of the electrolytic cell and enters the hydrogen side separator; the oxygen-containing gas-liquid mixture is discharged from an oxygen side outlet of the electrolytic cell and enters an oxygen side separator. The electrolyte separated by the hydrogen side separator and the oxygen side separator is cooled by an electrolyte cooler and then pumped into an electrolytic cell by a circulating pump. And the hydrogen mixture separated by the hydrogen side separator is subjected to dealkalization, dehydration, temperature reduction and other treatments, and the oxygen mixture separated by the oxygen side separator is subjected to dealkalization, dehydration, temperature reduction and other treatments.

In the water electrolysis hydrogen production device, the control of the circulating flow of the electrolyte is very important, and the separation effect of the separator, the overall work safety of the equipment and the like are directly influenced. In the prior art, the working flow and the pressure head of the circulating pump are fixed, and when a common circulating pump is configured in a model selection mode, the rated flow can be larger than the optimal working condition electrolyte flow of the electrolytic hydrogen production system, and in actual production, the electrolyte circulation volume is controlled within a reasonable interval by the opening of an outlet valve of the circulating pump. The valve internals are seriously eroded by high-temperature alkali liquor, the valve rod frequently acts, and the leakage of the alkali liquor from the sealing position of the valve rod commonly occurs. The valve has large maintenance amount and high loss.

Disclosure of Invention

In view of the above problems, embodiments of the present invention provide a hydrogen production apparatus and system by electrolyzing water, which can accurately control the flow rate of electrolyte circulation and avoid the phenomenon that valve internals receive high-temperature alkali liquor to wash away.

According to one aspect of the embodiments of the present invention, there is provided an apparatus for producing hydrogen by electrolyzing water. The hydrogen production device by electrolyzing water 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 hydrogen side separator and the discharge end of the oxygen side separator are both provided with a discharge pipe and two, the other ends of the 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 feeding end of the electrolytic tank, and the heat exchanger, the flowmeter and the variable frequency circulating pump are connected with the main circulating pipe in series.

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 system further comprises a filter group, wherein the filter group is connected on the circulating pipe in series, the filter group comprises two filters which are connected with each other in parallel through a pipeline or the filter group comprises a service valve and a filter which are connected with each other in parallel through a pipeline.

In some embodiments, the heat exchanger, the filter bank, and the variable frequency circulation pump are disposed in series from a head end of the main circulation pipe to a tail end of the main circulation pipe.

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

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

In some embodiments, the circulating pump set comprises a plurality of circulating pumps, at least one of the circulating pumps is a variable frequency circulating pump, the circulating pumps are connected in parallel to form a circulating pump set, the circulating pump set is connected in series with a main circulating pipe, and the circulating pumps in the branch of the circulating pump set are connected in series with respective independent check valves.

In some embodiments, the electrolysis cell is in plurality, and a plurality of electrolysis cells are connected in parallel with each other.

In some embodiments, the hydrogen side separator and the oxygen side separator are in communication at the bottom by a communication conduit.

Based on the above-mentioned hydrogen production device by water electrolysis, another aspect of the present invention provides a hydrogen production system by water electrolysis, which comprises a plurality of electrolytic cell groups and a plurality of circulation pump groups, wherein each electrolytic cell group at least comprises one electrolytic cell, the plurality of electrolytic cell groups are connected in parallel, each circulation pump group at least comprises one circulation pump, each circulation pump group at least comprises one variable frequency circulation pump, the plurality of circulation pump groups are arranged corresponding to the plurality of electrolytic cell groups, and when more than one electrolytic cell group operates and the rest electrolytic cell groups are shut down, the circulation pump group corresponding to the shut-down electrolytic cell group operates in a frequency-reducing manner.

The beneficial effect in this application is: the application shows a hydrogen plant by electrolyzing water, through setting up the frequency conversion circulating pump for go into the electrolysis trough with electrolyte pump, drive electrolyte is at hydrogen plant inner loop by the electrolysis water. At least 1 circulating pump in the water electrolysis hydrogen production device is a variable frequency pump, and the flow or pressure head and the like of the circulating pump can be adjusted. The flow of the variable-frequency circulating pump can be adjusted by setting parameters of the frequency converter, and the variable-frequency circulating pump and the flow meter can form a control loop to realize automatic control of set flow. The flow of the variable-frequency circulating pump is not required to be adjusted through a valve, so that the situation that the valve is corroded does not exist, and the situation that alkali liquor leaks from the sealing position of the valve rod does not exist naturally. And the variable-frequency circulating pump and the flowmeter form a control loop, and the flow of the electrolyte is regulated and controlled more sensitively and automatically under the assistance of a control system such as a PLC (programmable logic controller) or a DCS (distributed control system), so that the flow of the electrolyte in the electrolyzed 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 water electrolysis hydrogen production device, the invention also provides a water electrolysis hydrogen production system, and the effect is the same as the above.

The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.

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 refer to like parts throughout the drawings. In the drawings:

FIG. 1 is a schematic overall view of a water electrolysis hydrogen production apparatus provided in an embodiment of the present application;

FIG. 2 is a schematic diagram of an apparatus for producing hydrogen by electrolyzing water with a plurality of circulating pumps according to an embodiment of the present application;

fig. 3 is a schematic diagram of a system for producing hydrogen by electrolyzing water according to an embodiment of the present application.

The reference numbers in the detailed description are as follows:

the device comprises an electrolytic cell 1, a hydrogen side separator 2, an oxygen side separator 3, a heat exchanger 4, a flowmeter 5, a circulating pump 6, a temperature detection element 7, a filter 8, a valve 9, a check valve 10, a main circulating pipe 11, an overhaul valve 12 and a communicating pipeline 13.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

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 "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.

The water electrolysis hydrogen production device mainly comprises an electrolytic bath, a hydrogen side separator, an oxygen side separator, an electrolyte circulating pump, an electrolyte cooler and the like. When the electrolytic cell is connected with a working power supply, a hydrogen-containing gas-liquid mixture flows out from the hydrogen side outlet of the electrolytic cell and enters the hydrogen side separator; the oxygen-containing gas-liquid mixture is discharged from an oxygen side outlet of the electrolytic cell and enters an oxygen side separator. And the electrolyte separated by the hydrogen side separator and the oxygen side separator is cooled by an electrolyte cooler and then pumped into an electrolytic cell by a circulating pump to complete circulation. And the hydrogen mixture separated by the hydrogen side separator is subjected to dealkalization, dehydration, temperature reduction and other treatments, and the oxygen mixture separated by the oxygen side separator is subjected to dealkalization, dehydration, temperature reduction and other treatments. In the water electrolysis hydrogen production device, the control of the circulation flow of the electrolyte is very important and mainly reflected in the following aspects:

1. the separation effect of the separator is influenced, the circulating flow of the electrolyte is overlarge, the hydrogen side separator and the oxygen side separator cannot completely separate the hydrogen, the oxygen and the electrolyte, and the unseparated hydrogen and oxygen circulate and converge along with the electrolyte, so that the content of oxygen in the hydrogen is finally caused, the content of hydrogen in the oxygen exceeds the standard, and explosion is generated under extreme conditions to threaten safe production.

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

3. If the circulating flow of the electrolyte is too small, the heat generated in the working process of the electrolytic cell can not be brought out by the electrolyte in time, so that the electrolytic cell is over-heated, equipment can be damaged in serious conditions, or the internal temperature of the electrolytic cell is unevenly distributed, and the electrolytic efficiency of the electrolytic cell is reduced.

Specifically, for can carrying out accurate control to the flow of electrolyte among the hydrogen plant of brineelectrolysis, avoid valve internals to receive the phenomenon that high temperature alkali lye erodees simultaneously, this application shows a hydrogen plant of brineelectrolysis. Referring to fig. 1, fig. 2 and fig. 3, fig. 1 is an overall schematic diagram of a water electrolysis hydrogen production apparatus provided in an embodiment of the present application, fig. 2 is a schematic diagram of a water electrolysis hydrogen production apparatus provided in an embodiment of the present application and having a plurality of variable frequency circulation pumps, fig. 3 is a schematic diagram of a water electrolysis hydrogen production system provided in an embodiment of the present application, and fig. 3 is a schematic diagram; a-21 to A-25 are electrolytic cells, 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 circulating pumps, G-21 to G-29 are temperature detecting elements, H-21 and H22 are filters, I-21-I-35 are valves, and J-21 to J-24 are check valves. The water electrolysis hydrogen production device comprises an electrolytic cell 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 rotor flowmeter. The discharge end of electrolysis trough 1 communicates in oxygen side separator 3 through going out the oxygen pipe, the discharge end of electrolysis trough 1 communicates in hydrogen side separator 2 through going out the hydrogen pipe, the discharge end of hydrogen side separator 2 and oxygen side separator 3 all is provided with the discharging pipe, the other end of two discharging pipes communicates the head end that has total circulating pipe 11 jointly, the tail end of total circulating pipe 11 communicates in the pan feeding end of electrolysis trough 1, it has heat exchanger 4 to establish ties on the total circulating pipe 11, flowmeter 5 and variable frequency circulating pump 6.

The electrolytic cell 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 cell 1 is connected with the electrolyte inlet of the hydrogen side separator 2 through a pipeline; the oxygen-side outlet of the electrolytic cell 1 and the electrolyte inlet of the oxygen-side separator 3 are connected by a pipe. The number of the electrolytic cells 1 in the water electrolysis hydrogen production device is more than or equal to 1.

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

Heat exchanger 4 is used for controlling the electrolyte temperature, can heat or cool off electrolyte, guarantees that the electrolyte temperature is in reasonable interval (the exit temperature of electrolysis trough 1 needs to guarantee at 90 + -5 degrees, and the entrance temperature needs to guarantee at 70 + -5 degrees, and so heat exchanger 4 plays the cooling effect 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 on the connection line from the outlet on the oxygen side of the electrolytic cell 1 to the oxygen-side separator 3; or on the electrolyte outlet line of the hydrogen side separator 2/oxygen side separator 3, or on the total circulation pipe 11; the heat exchanger can also be positioned at other positions of the electrolyte circulation pipeline, or can be positioned at any combination of more than 1 position, the number of the heat exchangers 4 is more than or equal to 1, and the specific position is not limited.

The variable frequency circulating pump 6 is used for pumping the electrolyte into the electrolytic cell 1 and driving the electrolyte to circulate in the water electrolysis hydrogen production device. At least 1 circulating pump in the water electrolysis hydrogen production device is a variable frequency circulating pump 6, and the flow or pressure head and the like of the circulating pump can be adjusted. The flow of the electrolyte in the variable-frequency circulating pump 6 can be adjusted by setting the parameters of the frequency converter, and the variable-frequency circulating pump and the flowmeter 5 can form a control loop to realize the automatic control of the set flow. Because the frequency conversion circulating pump 6 can not need to adjust the flow rate through the valve 9, the situation that the valve 9 is corroded does not exist, and the situation that the alkali liquor leaks from the valve rod sealing part 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 control system such as a PLC (programmable logic controller) or a DCS (distributed control system), so that the flow of the electrolyte in the electrolyzed water hydrogen production device is always kept in an optimal state, and the working efficiency of the whole system is fully ensured.

In some embodiments, the 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 normally works, the temperature of the electrolyte is high (generally 50-95 ℃), the corrosivity is strong, and meanwhile, the electrolyte has a certain pressure (generally 1.6 MPa). Preferably, a variable-frequency canned motor pump, a variable-frequency magnetic pump and the like are used, and the variable-frequency canned motor pump and the variable-frequency magnetic pump have a good anti-seepage function and can effectively prevent electrolyte from leaking out of a pump body.

In some embodiments, referring to fig. 2, it further comprises a filter group, the filter group is connected in series on the circulation pipe, the filter group is two filters 8 connected in parallel with each other through a pipeline or the filter group is a service valve 12 and a filter 8 connected in parallel through a pipeline. The filter 8 is used for filtering impurities in the electrolyte and preventing the impurities from entering the electrolytic bath 1, the variable frequency circulating pump 6, the flowmeter 5 and other devices 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/the oxygen side separator 3 (such as 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 the electrolyte can be added through the flow valve. The position and number of the filter 8 are not limited. The following two alternatives are provided in connection with the arrangement of the filter 8.

The first alternative is as follows: as shown in fig. 3, more than two filters 8 are connected in parallel, and valves 9 are provided at the inlet and outlet of each filter 8 so that the filters 8 can be switched when the apparatus is in operation. Cleaning and maintaining (such as the parallel connection of the inlet and the outlet of the filter H-21 and the filter H-22 in the figure 3).

Alternative two: as shown in figure 2, valves 9 (I-1 and I-2 in figure 2) are arranged at the inlet and the outlet of the filter 8, a crossover line is arranged at the same time, the crossover line is directly communicated with the inlet valve front pipeline of the filter 8 and the outlet valve rear pipeline of the filter 8, a service valve 12 is arranged on the crossover line, and the parallel connection of the filter 8 and the service valve 12 is realized through the mode. Is used for cleaning the filter 8 when the water electrolysis hydrogen production device runs. In normal operation, the service valve 12 is closed and the inlet and outlet valves (I-1 and I-2 in FIG. 2) of the filter 8 are opened. When the filter 8 is cleaned, the maintenance valve 12 is opened, the inlet and outlet valves (I-1 and I-2 in figure 2) of the filter 8 are closed, the filter 8 is disassembled, the filter element of the filter 8 is cleaned or replaced, the inlet and outlet valves (I-1 and I-2 in figure 2) of the filter 8 are opened, and the maintenance valve 12 is closed, so that normal operation can be recovered.

In some embodiments, the heat exchanger 4, the filter bank, and the variable frequency circulation pump 6 are disposed in sequence from the head end of the main circulation pipe 11 to the tail end of the main circulation pipe 11. Through actual measurement, under the connection sequence, the whole operation efficiency of the system is high, and the failure rate is low.

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

The temperature detection element 7 is used to detect the electrolyte temperature. Preferably, the temperature detecting elements 7 are located on the connection pipeline from the hydrogen side outlet of the electrolytic cell 1 to the electrolyte inlet of the hydrogen side separator 2 (G-1 in FIG. 2) or from the oxygen side outlet of the electrolytic cell 1 to the electrolyte inlet of the oxygen side separator 3 (G-2 in FIG. 3), or on the equipment body of the hydrogen side separator 2, the equipment body of the oxygen side separator 3, or other positions of the total circulating pipe 11, or a combination of any of the above positions, and the number of the temperature detecting elements 7 is not less than 1 without limitation.

In some embodiments, with continued reference to fig. 3, a plurality of circulation pumps are included, at least one of which is a variable frequency circulation pump 6. A plurality of circulating pumps are connected in parallel and then are connected in series on a main circulating pipe 11, and a plurality of circulating pumps in the branch of the circulating pump are connected in series with independent check valves 10.

2 or more than 2 circulating pumps form 1 group, wherein at least one circulating pump is a variable frequency circulating pump 6, and the outlets and inlets of the circulating pumps are connected in parallel. Under normal working conditions, 1 circulating pump operates in 1 group of circulating pumps, and the rest are shut down for standby. The 1 group of circulating pumps can provide electrolyte for a plurality of electrolytic tanks 1, the outlet of the 1 group of circulating pumps is connected with the electrolyte inlet 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 the 2 electrolytic tanks A-22 and A-23), and more than 1 group of electrolyte circulating pumps can be arranged in the water electrolysis hydrogen production device (as shown in figure 3, the circulating pump F-21 is a first group, the circulating pump F-22 and the circulating pump F-23 are a second group, and the circulating pump F-24 is a third group). A valve 9 is arranged in front of or behind each circulating pump, or valves 9 are arranged in front of and behind each circulating pump, so that the running states of the circulating pumps can be switched (for example, valves I-5, I-6, I-7 and I-8 are arranged in front of and behind circulating pumps F-1 and F-2 in the figure 2), and the maintenance and isolation are convenient. When more than 1 electrolytic cell 1 or more than 1 circulating pump exists in the water electrolysis hydrogen production device (or both are satisfied), a check valve 10 can be arranged between the circulating pump and the inlet of the electrolytic cell 1 or in front of the inlet of the circulating pump. The electrolyte is prevented from flowing reversely in the electrolytic cell 1 and the circulating pump (for example, 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 the figure 2).

In some embodiments, the electrolytic cell 1 is in plurality, and the plurality of electrolytic cells 1 are connected in parallel with each other.

When the power supply is insufficient and the electrolytic tank 1 of the water electrolysis hydrogen production device can not be ensured to be operated completely, 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 figure 3) is shut down. At this time, the variable frequency circulating pump 6 corresponding to the shut-down electrolytic tank 1 can be operated in a frequency-reducing mode, and the electrolyte with higher temperature in the water electrolysis hydrogen production device passes through the shut-down electrolytic tank 1 at a lower flow rate to maintain the temperature in the electrolytic tank 1, so that the electrolytic tank 1 can be conveniently and rapidly started to operate at any time (during operation, the temperature of the electrolyte inlet of the electrolytic tank 1 needs to be maintained at 70 +/-5 ℃). In addition, because the shut-down electrolytic tank 1 can emit heat which flows through the electrolyte to a certain extent, the electrolyte in the working electrolytic tank 1 can play a role of cooling to a certain extent when passing through the shut-down 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 bottoms of the hydrogen-side separator 2 and the oxygen-side separator 3 are communicated through a communication pipe 13.

The bottom of the hydrogen side separator 2 and the bottom of the oxygen side separator 3 are provided with a communicating pipeline 13. So as to better adjust the pressure on the hydrogen side and the oxygen side of the electrolytic cell 1 and the pressure difference.

Referring to fig. 3, based on the above-mentioned hydrogen production apparatus by water electrolysis, another aspect of the present invention provides a hydrogen production system by water electrolysis, which includes a plurality of electrolytic cell groups and a plurality of circulation pump groups, wherein the electrolytic cell group includes at least one electrolytic cell, the plurality of electrolytic cell groups are connected in parallel, the circulation pump group includes at least one circulation pump, the plurality of circulation pump groups includes at least one variable frequency circulation pump, the plurality of circulation pump groups are arranged corresponding to the plurality of electrolytic cell groups, and when more than one electrolytic cell group operates and the remaining electrolytic cell groups stop, the circulation pump group corresponding to the stopped electrolytic cell group operates in a frequency-reducing manner. At least one variable frequency circulating pump is arranged in the water electrolysis hydrogen production system, and the functions and the beneficial effects are the same as above, and are not repeated again here.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present disclosure, and the present disclosure should be construed as being covered by the claims and the specification. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims

1. The utility model provides an electrolytic water hydrogen manufacturing installation, its characterized in that, includes electrolysis trough, hydrogen side separator, oxygen side separator, heat exchanger, flowmeter and frequency conversion circulating pump, the discharge end of electrolysis trough communicate through going out the oxygen pipe in oxygen side separator, the discharge end of electrolysis trough communicate through going out the hydrogen pipe 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 of discharging pipe communicates jointly has the head end of total circulating pipe, the tail end of total circulating pipe communicate in the pan feeding end of electrolysis trough, it has heat exchanger, flowmeter and frequency conversion circulating pump to establish ties on the total circulating pipe.

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

3. The apparatus for producing hydrogen by electrolyzing water as claimed in claim 1, further comprising a filter group, wherein the filter group is connected in series to the circulation tube, the filter group is two filters connected in parallel to each other through a pipeline or the filter group is a service valve and a filter connected in parallel through a pipeline.

4. The apparatus for producing hydrogen by electrolyzing water as claimed in claim 3, wherein said heat exchanger, said filter group and said variable frequency circulating pump are arranged in sequence from the head end of said main circulating pipe to the tail end of said main circulating pipe.

5. An apparatus for producing hydrogen by electrolyzing water as recited in claim 1 comprising at least one temperature sensing element.

6. The apparatus for producing hydrogen by electrolyzing water as claimed in claim 1, wherein said flow meter is an electromagnetic flow meter or a rotameter.

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

8. The apparatus for producing hydrogen by electrolyzing water as claimed in claim 1, wherein said electrolytic bath is plural, and said plural electrolytic baths are connected in parallel.

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 their bottoms by a communication pipe.

10. A large-scale water electrolysis hydrogen production system based on any one of claims 1-9, characterized by comprising a plurality of electrolytic cell groups and a plurality of circulation pump groups, wherein the electrolytic cell group at least comprises one electrolytic cell, the plurality of electrolytic cell groups are connected in parallel, the circulation pump group at least comprises one circulation pump, the circulation pump group at least comprises one variable frequency circulation pump, the plurality of circulation pump groups are arranged corresponding to the plurality of electrolytic cell groups, and when more than one electrolytic cell group operates and the rest of the electrolytic cell groups are shut down, the circulation pump group corresponding to the shut-down electrolytic cell group operates in a frequency-reducing manner.