CN216891239U - Water electrolysis hydrogen production system - Google Patents

Abstract

The utility model relates to a hydrogen production system by water electrolysis, including electrolyte supply flow path, hydrogen collection device and oxygen collection device, vapour and liquid separator and a plurality of electrolysis trough that link to each other with vapour and liquid separator, electrolyte supply flow path links to each other with the electrolysis trough in order to be used for providing electrolyte to the electrolysis trough, the electrolysis trough is used for the brineelectrolysis to produce hydrogen and oxygen, the separator includes oxygen separator and hydrogen separator, hydrogen collection device links to each other with the hydrogen separator, in order to collect the hydrogen that comes from the hydrogen separator, oxygen collection device links to each other with the oxygen separator, in order to collect the oxygen that comes from the separation of oxygen separator, a plurality of electrolysis troughs set up in parallel and each electrolysis trough links to each other with hydrogen separator and oxygen separator respectively. The arrangement of the plurality of electrolytic tanks is beneficial to increasing the gas production of the system, and the operation load of each electrolytic tank can be respectively adjusted, so that the gas production is gently changed, and the gas production adjustment range is larger. In addition, the gas-liquid separator is parallelly connected and shared by a plurality of electrolytic tanks, so that the system has smaller occupied area and lower manufacturing cost.

Description

Water electrolysis hydrogen production system

Technical Field

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

Background

With the development and popularization of new energy technologies, more and more industries begin to develop and apply the new energy technologies, hydrogen energy is one of the main forces of clean energy, the application range is wider in recent years, and the market demand for hydrogen energy is larger. Therefore, in order to improve the yield, the water electrolysis hydrogen production device is developed towards the direction of high yield at present, and the conventional hydrogen production equipment generally only comprises an electrolytic cell and a gas-liquid treatment device in one set of hydrogen production equipment, so that the yield is low, the investment cost of the equipment is high, the occupied area is relatively large, and the adjustable range of the yield is small. And if the gas production of the electrolytic cell changes, the size of the container in the corresponding gas-liquid treatment device also needs to be changed, but the design of the container is long in time, the production link cannot be batched, the production cost is high, and the universality of the equipment is poor.

SUMMERY OF THE UTILITY MODEL

The purpose of the present disclosure is to provide a hydrogen production system by water electrolysis, which can increase the hydrogen yield and increase the yield adjusting range of the hydrogen production system, and has small floor area and low investment cost compared with the existing hydrogen production device with the same yield.

In order to achieve the above object, the present disclosure provides a water electrolysis hydrogen production system, including an electrolyte supply flow path, a hydrogen gas collection device, and an oxygen gas collection device, the water electrolysis hydrogen production system further including a gas-liquid separator and a plurality of electrolysis cells connected to the gas-liquid separator, the electrolyte supply flow path being connected to the electrolysis cells for supplying electrolyte to the electrolysis cells, the electrolysis cells being used for electrolyzing water to generate hydrogen gas and oxygen gas, the gas-liquid separator including an oxygen separator and a hydrogen separator, the hydrogen separator being used for gas-liquid separation of the hydrogen gas generated by the electrolysis cells, the hydrogen gas collection device being connected to the hydrogen separator for collecting hydrogen gas from the hydrogen separator, the oxygen separator being used for gas-liquid separation of the oxygen gas generated by the electrolysis cells, the oxygen gas collection device being connected to the oxygen separator for collecting oxygen gas from the oxygen separator, wherein the plurality of electrolysis cells are arranged in parallel, and each electrolysis cell is respectively connected with the hydrogen separator and the oxygen separator.

Optionally, each electrolytic cell is connected to the hydrogen separator through a hydrogen pipeline, and each hydrogen pipeline is provided with a first cut-off valve and/or a first emptying valve; each electrolytic cell is respectively connected with the oxygen separator through an oxygen pipeline, and each oxygen pipeline is provided with a second cut-off valve and/or a second emptying valve.

Optionally, the number of the hydrogen separators is multiple, and the multiple hydrogen separators are communicated through a pipeline; the number of the oxygen separators is multiple, and the oxygen separators are communicated through pipelines.

Optionally, at least two hydrogen separators of the plurality of hydrogen separators are connected to form a hydrogen separator group, at least two oxygen separators of the plurality of oxygen separators are connected to form an oxygen separator group, the hydrogen separator group and the oxygen separator group are communicated through a pipeline, and a switch valve is arranged on the pipeline.

Optionally, the system for producing hydrogen by electrolyzing water further comprises a cooling device and an electrolyte flow path, wherein the cooling device comprises a cooler, a cooling liquid supply flow path connected with the cooler, a cooling liquid return flow path connected with the cooler, and a first regulating valve, and the first regulating valve is arranged on the cooling liquid supply flow path or the cooling liquid return flow path and is used for regulating the flow rate of the cooling liquid flowing through the cooler;

the electrolyte flow path comprises a first electrolyte flow path and a second electrolyte flow path, one end of the first electrolyte flow path is connected with the gas-liquid separator, the other end of the first electrolyte flow path is connected with the cooler, one end of the second electrolyte flow path is connected with the cooler, and the other end of the second electrolyte flow path is connected with the corresponding electrolytic cell.

Optionally, the cooling device further includes a second regulating valve connected to the cooling liquid supply flow path or the cooling liquid return flow path through a branch to be provided in parallel with the first regulating valve, one of the second regulating valve and the first regulating valve is a pneumatic butterfly valve, and the other is a first pneumatic diaphragm regulating valve.

Optionally, the system for producing hydrogen by electrolyzing water further comprises a first gas quantity regulating valve group and a second gas quantity regulating valve group, wherein the first gas quantity regulating valve group is arranged at the downstream of the hydrogen outlet of the hydrogen separator to regulate the gas output quantity of the hydrogen outlet, and the second gas quantity regulating valve group is arranged at the downstream of the oxygen outlet of the oxygen separator to regulate the gas output quantity of the oxygen outlet;

the regulating range of the gas output of the hydrogen outlet by the first gas quantity regulating valve group is different from the regulating range of the gas output of the oxygen outlet by the second gas quantity regulating valve group.

Optionally, the first air regulating valve group comprises a second pneumatic membrane regulating valve and a third pneumatic membrane regulating valve, and the second pneumatic membrane regulating valve and the third pneumatic membrane regulating valve are arranged in parallel on a pipeline communicated with the hydrogen outlet;

the second air quantity regulating valve group comprises a fourth pneumatic film regulating valve and a fifth pneumatic film regulating valve, and the fourth pneumatic film regulating valve and the fifth pneumatic film regulating valve are connected in parallel on a pipeline communicated with the oxygen outlet.

Optionally, the system for producing hydrogen by electrolyzing water further comprises a plurality of electrolyte circulating pumps, a plurality of electrolyte flowmeters and a plurality of third cut-off valves, wherein the electrolyte circulating pumps, the electrolyte flowmeters and the third cut-off valves are arranged on the electrolyte flow paths communicated with the electrolytic cells.

Optionally, the water electrolysis hydrogen production system further comprises a gas washing device, the gas washing device comprises a hydrogen washing tower and an oxygen washing tower, hydrogen separated by the hydrogen separator enters the hydrogen washing tower through a pipeline, a gas washing reflux pipeline interface is arranged at the middle section of the hydrogen washing tower and used for connecting a gas washing reflux pipeline, and the gas washing reflux pipeline is connected with the corresponding hydrogen separator;

oxygen separated by the oxygen separator enters the oxygen washing tower through a pipeline, a washing gas return pipeline interface is arranged at the middle section of the oxygen washing tower and used for being connected with a washing gas return pipeline, and the washing gas return pipeline is connected with the corresponding oxygen separator.

Through the technical scheme, the plurality of electrolytic tanks are arranged in the hydrogen production system, work simultaneously, the gas production rate of the system is increased, the plurality of electrolytic tanks are arranged in parallel, each electrolytic tank is connected with the gas-liquid separator, and when the gas production rate of the system needs to be adjusted greatly, the operation load of each electrolytic tank can be adjusted respectively, so that the gas production rate is changed gently, and the gas production rate adjustment range is larger. In addition, the gas-liquid separator is shared in parallel by a plurality of electrolytic tanks, and compared with the existing equipment with the same gas production rate, the water electrolysis hydrogen production system has the advantages of smaller occupied area and lower manufacturing cost. In addition, because of the plurality of electrolytic tanks, the electrolytic tank in the shutdown state can be heated by utilizing the residual heat of the running electrolytic tank, so that the electrolytic tank in the shutdown state is always in the hot standby state, the time for starting the equipment can be shortened, and the energy consumption during the starting period of the equipment can be reduced.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

FIG. 1 is a schematic diagram of a system for producing hydrogen by electrolyzing water according to an embodiment of the present disclosure;

FIG. 2 is an enlarged schematic view of portion A of FIG. 1;

FIG. 3 is an enlarged schematic view of portion B of FIG. 1;

FIG. 4 is an enlarged schematic view of section C of FIG. 1;

FIG. 5 is an enlarged schematic view of portion D of FIG. 1;

FIG. 6 is an enlarged schematic view of section E of FIG. 1;

fig. 7 is an enlarged schematic view of portion F of fig. 1.

Description of the reference numerals

1-a gas-liquid separator; 11-a hydrogen separator; 12-an oxygen separator; 2-an electrolytic cell; 3-hydrogen gas circuit; 4-an oxygen line; 5-a first shut-off valve; 6-a second shut-off valve; 7-a first vent valve; 8-a second vent valve; 9-oxygen automatic sampling valve; 10-a temperature measuring instrument; a 13-hydrogen separator bank; 14-an oxygen separator train; 15-a switch valve; 16-a cooling device; 17-an electrolyte flow path; 171-a first electrolyte flow path; 172-a second electrolyte flow path; 181-coolant supply flow path; 182-a coolant return flow path; 19-a cooler; 20-a first regulating valve; 21-a second regulating valve; 22-a first air quantity regulating valve group; 221-a second pneumatic diaphragm regulating valve; 222-a third pneumatic membrane regulating valve; 223-a first pneumatic ball valve; 224-a first manual ball valve; 23-a second air volume adjusting valve group; 231-fourth pneumatic membrane regulating valve; 232-fifth pneumatic membrane regulating valve; 233-a second pneumatic ball valve; 234-a second manual ball valve; 24-an electrolyte circulation pump; 25-an electrolyte flow meter; 26-a third shut-off valve; a 27-hydrogen wash column; a 28-oxygen wash column; 29-a purge gas return line; 30-fourth shut-off valve.

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless otherwise specified, directional terms such as "upper, lower, left and right" are generally defined with reference to the drawing plane directions of the corresponding drawings. "inner and outer" refer to the inner and outer of the profile of the respective component.

Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

As shown in fig. 1 to 7, the present disclosure provides a water electrolysis hydrogen production system, comprising an electrolyte supply flow path, a hydrogen gas collection device and an oxygen gas collection device, the water electrolysis hydrogen production system further comprising a gas-liquid separator 1 and a plurality of electrolysis cells 2 connected to the gas-liquid separator 1, the electrolyte supply flow path being connected to the electrolysis cells 2 for supplying electrolyte to the electrolysis cells 2, the electrolysis cells 2 being used for electrolyzing water to generate hydrogen gas and oxygen gas, the gas-liquid separator 1 comprising an oxygen separator 12 and a hydrogen separator 11, the hydrogen separator 11 being used for gas-liquid separation of the hydrogen gas generated by the electrolysis cells 2, the hydrogen gas collection device being connected to the hydrogen separator 11 for collecting hydrogen gas from the hydrogen separator 11, the oxygen separator 12 being used for gas-liquid separation of the oxygen gas generated by the electrolysis cells 2, the oxygen gas collection device being connected to the oxygen separator 12 for collecting oxygen gas separated from the oxygen separator 12, wherein, a plurality of electrolytic cells 2 are arranged in parallel, and each electrolytic cell 2 is connected to a hydrogen separator 11 and an oxygen separator 12, respectively.

The hydrogen production by water electrolysis is that direct current is introduced into an electrolytic tank filled with electrolyte, and water molecules are subjected to electrochemical reaction on an electrode and are decomposed into hydrogen and oxygen. In order to improve the ionic conductivity of water and reduce the interference of other ions in the hydrogen production process by electrolyzing water in the current production process, the electrolyte can be alkaline solution (such as KOH and NaOH solution). The alkaline liquid water electrolysis technology takes KOH and NaOH aqueous solutions as electrolytes and asbestos cloth and the like as diaphragms, and electrolyzes water under the action of direct current to generate hydrogen and oxygen.

The number of the electrolytic cells 2 is not limited in the present disclosure, and may be two or more than two. As shown in fig. 1, 4 electrolytic cells 2 are connected to a gas-liquid separator 1, respectively, the electrolytic cells 2 are filled with an electrolyte, electrodes are further provided in the electrolytic cells 2, the electrolyte is electrolyzed by energizing the electrodes to generate hydrogen and oxygen, and the gas-liquid separator 1 separates gas and liquid in the gas-liquid mixture.

Through the technical scheme, the plurality of electrolytic tanks 2 are arranged in one hydrogen production system, the plurality of electrolytic tanks 2 work simultaneously, the gas production rate of the system is increased, the plurality of electrolytic tanks 2 are arranged in parallel, each electrolytic tank 2 is connected with the gas-liquid separator 1, when the gas production rate of the system needs to be adjusted greatly, the operation load of each electrolytic tank 2 can be adjusted respectively, the gas production rate is changed gently, and the gas production rate adjusting range is larger. In addition, the gas-liquid separator 1 is shared by a plurality of electrolytic tanks 2 in parallel, and compared with the existing equipment with the same gas production rate, the hydrogen production system by electrolyzing water in the disclosure has smaller occupied area and lower manufacturing cost.

In addition, because a plurality of electrolytic tanks 2 are provided, the electrolytic tank 2 in the shutdown state can be heated by utilizing the residual heat of the running electrolytic tank 2, so that the electrolytic tank 2 in the shutdown state is always in the hot standby state, the time for starting the equipment can be shortened, and the energy consumption during the starting period of the equipment can be reduced. Wherein, the plurality of electrolytic cells 2 can realize the transmission of the waste heat in a plurality of proper connection modes, for example, a cooling liquid pipeline is connected between the electrolytic cells 2, a cooling liquid channel is arranged on the electrolytic cells 2 per se and is communicated with the cooling liquid pipeline, and a switch valve can be arranged on the cooling liquid pipeline, thus realizing the transmission of the waste heat between the electrolytic cells 2 when needed.

Alternatively, as an embodiment of the present disclosure, as shown in fig. 1 and fig. 2, each electrolytic cell 2 is connected to a hydrogen separator 11 through a hydrogen pipeline 3, and each hydrogen pipeline 3 is provided with a first cut valve 5 and/or a first emptying valve 7; each electrolytic cell 2 is respectively connected with an oxygen separator 12 through an oxygen pipeline 4, and each oxygen pipeline 4 is provided with a second cut-off valve 6 and/or a second emptying valve 8. When one of the first air release valve 7 and the first cut-off valve 5 is disposed on the hydrogen pipeline 3, the other one may be disposed at the connection between the electrolyzer 2 and the hydrogen pipeline 3, or both the first cut-off valve 5 and the first air release valve 7 may be disposed on the hydrogen pipeline 3, so as to cut off and empty the hydrogen pipeline 3 and the corresponding electrolyzer 2.

The second cut-off valve 6 and the second vent valve 8 can be arranged in the same way as the first cut-off valve 5 and the first vent valve 7, and are not described in detail here.

Set up trip valve and atmospheric valve on the hydrogen pipeline 3 of every electrolysis trough 2 and oxygen pipeline 4's pipeline, can break down when needing to overhaul single electrolysis trough 2, cut off the contact of this electrolysis trough 2 and system alone through the trip valve, overhaul single electrolysis trough 2, overhaul the in-process, other electrolysis troughs 2 in the system can also normal operating, so, promoted maintenance efficiency, guaranteed also that other electrolysis troughs 2 are not influenced, can normally work.

Optionally, as shown in fig. 1 and fig. 2, an oxygen automatic sampling valve 9 is installed at an oxygen outlet of each electrolytic cell 2, a temperature measuring instrument 10 is installed at each of the hydrogen and oxygen outlets, in the production process, an operator can sample through the oxygen sampling valve, detect a sample, and judge the operation condition of the equipment, and the oxygen outlet of each electrolytic cell 2 is provided with the oxygen automatic sampling valve 9, so that if a problem occurs, the faulty electrolytic cell 2 can be located immediately, and the maintenance efficiency is improved. The temperature measuring instrument 10 can also reflect the current temperature in the electrolytic bath 2, so that the running condition of the electrolytic bath 2 can be conveniently determined, and the threat of overhigh temperature to the stable running of the system is avoided.

Alternatively, as an embodiment of the present disclosure, as shown in fig. 1, the number of the hydrogen separators 11 is plural, and the plural hydrogen separators 11 are communicated by a pipe; the number of the oxygen separators 12 is plural, and the plural oxygen separators 12 are communicated by a pipe. Because the gas production when many electrolysis trough 2 simultaneous operation is bigger, and pass through the pipeline intercommunication with a plurality of hydrogen separators 11 and oxygen separator 12, can satisfy the gas-liquid separation needs of many electrolysis trough 2 simultaneous operation better, and when the gas production of electrolysis trough 2 changed, because hydrogen separator 11 and oxygen separator 12's volume is bigger, the change range that can adapt to is also bigger, consequently, can provide the guarantee for the gas production adjustment of electrolysis trough 2, make the system operate more steadily.

Alternatively, as an embodiment of the present disclosure, as shown in fig. 1 and 3, at least two hydrogen separators 11 of the plurality of hydrogen separators 11 are connected to form a hydrogen separator group 13, at least two oxygen separators 12 of the plurality of oxygen separators 12 are connected to form an oxygen separator group 14, and the hydrogen separator group 13 and the oxygen separator group 14 are connected by a communication pipeline, and a switch valve 15 is disposed on the pipeline. During normal operation of the system, the difference between the liquid levels in the hydrogen separator 11 and the oxygen separator 12 is not large, but since the amounts of hydrogen and oxygen generated by electrolysis of the electrolyte per unit volume are different, the liquid levels in the hydrogen separator 11 and the oxygen separator 12 are also different due to the difference in gas pressure, and the difference in liquid levels is generated.

In order to ensure the liquid level balance between the hydrogen separator group 13 and the oxygen separator group 14 and reduce the liquid level difference, a communication pipeline is arranged between the hydrogen separator group 13 and the oxygen separator group 14, and when the liquid levels in the hydrogen separator 11 and the oxygen separator 12 change due to the air pressure, the liquid in the separators can mutually flow through the communication pipeline so as to reduce the influence of the liquid level change. Meanwhile, the switching valve 15 is arranged on the communicating pipeline between the hydrogen separator group 13 and the oxygen separator group 14, so that the communicating pipeline can be cut off in time when the liquid level difference between the hydrogen separator group 13 and the oxygen separator group 14 is overlarge, the electrolyte or gas in the two groups of separators can be prevented from flowing into each other, and the operation safety of the system can be ensured.

Here, it should be noted that, in other embodiments of the present disclosure, the on-off valve 15 may be a pneumatic ball valve or a manual ball valve, which is not limited by the present disclosure.

Alternatively, as an embodiment of the present disclosure, as shown in fig. 1 and 4, the water electrolysis hydrogen production system further includes a cooling device 16 and an electrolyte flow path 17, the cooling device 16 includes a cooler 19, a coolant supply flow path 181 connected to the cooler 19, a coolant return flow path 182 connected to the cooler 19, and a first regulating valve 20, and the first regulating valve 20 is disposed on the coolant supply flow path 181 or the coolant return flow path 182 for regulating the flow rate of the coolant flowing through the cooler 19. The electrolyte flow path 17 includes a first electrolyte flow path 171 and a second electrolyte flow path 172, one end of the first electrolyte flow path 171 is connected to the gas-liquid separator 1, the other end of the first electrolyte flow path 171 is connected to the cooler 19, one end of the second electrolyte flow path 172 is connected to the cooler 19, and the other end of the second electrolyte flow path 172 is connected to the corresponding electrolytic cell 2, that is, the cooler 19 is arranged on both the coolant flow path and the electrolyte flow path 17.

In the cooler 19, the coolant exchanges heat with the electrolyte in the coiled electrolyte flow path 17 to cool the electrolyte, and a first regulating valve 20 is provided in the coolant flow path (the coolant supply flow path 181 or the coolant return flow path 182) to regulate the flow rate of the coolant in the cooler 19, thereby controlling the amount of the coolant that exchanges heat with the electrolyte per unit time to control the operating temperature in the system.

Alternatively, as an embodiment of the present disclosure, as shown in fig. 1 and 4, the cooling device 16 further includes a second regulating valve 21, the second regulating valve 21 being branched to the coolant supply flow path 181 or the coolant return flow path 182 to be disposed in parallel with the first regulating valve 20, one of the second regulating valve 21 and the first regulating valve 20 being a pneumatic butterfly valve, and the other being a first pneumatic diaphragm regulating valve.

When the system is low in operation load and low in gas production, the temperature fluctuation of the electrolyte is small, the adjustment precision of the pneumatic film adjusting valve is high, and the flow of the cooling liquid can be finely adjusted through the pneumatic film adjusting valve so as to keep the overall operation temperature of the system stable; when the system is high in operation load and gas production amount, the electrolyte is easy to generate large temperature fluctuation at the moment, and the adjustment requirement cannot be met only by using the pneumatic film adjusting valve.

Optionally, as an embodiment of the present disclosure, as shown in fig. 1, the water electrolysis hydrogen production system further includes a first gas regulating valve group 22 and a second gas regulating valve group 23, the first gas regulating valve group 22 is disposed downstream of the hydrogen outlet of the hydrogen separator 11 to regulate the gas output of the hydrogen outlet, and the second gas regulating valve group 23 is disposed downstream of the oxygen outlet of the oxygen separator 12 to regulate the gas output of the oxygen outlet; the regulating range of the first gas quantity regulating valve group 22 for the gas output of the hydrogen outlet is different from the regulating range of the second gas quantity regulating valve group 23 for the gas output of the oxygen outlet. In order to ensure the stability of the whole pressure in the system, a first air quantity regulating valve group 22 is arranged at the downstream of the hydrogen outlet of the hydrogen separator 11, and a second air quantity regulating valve group 23 is arranged at the downstream of the oxygen outlet of the oxygen separator 12, so that the air output quantities of hydrogen and oxygen can be adjusted according to the difference of the operation loads of the system, and the stability of the air pressure in the system is ensured.

Because the amount of hydrogen and oxygen generated by the electrolyte with the same volume is different, the volume of gas in the hydrogen separator 11 and the oxygen separator 12 can also have difference, and gas amount regulating valve banks with different regulating ranges are respectively arranged at the downstream of the hydrogen outlet and the oxygen outlet of the hydrogen separator 11 and the oxygen separator 12, so that the regulating requirements of different gas amounts can be met, the stability of the gas pressure in the system is ensured, and the system can safely operate.

Alternatively, as an embodiment of the present disclosure, as shown in fig. 5 and 6, the first air volume adjusting valve group 22 includes a second pneumatic membrane adjusting valve 221 and a third pneumatic membrane adjusting valve 222, and the second pneumatic membrane adjusting valve 221 and the third pneumatic membrane adjusting valve 222 are disposed in parallel on a pipeline communicating with the hydrogen outlet.

The second air volume adjusting valve group 23 comprises a fourth pneumatic film adjusting valve 231 and a fifth pneumatic film adjusting valve 232, and the fourth pneumatic film adjusting valve 231 and the fifth pneumatic film adjusting valve 232 are arranged in parallel on a pipeline communicated with the oxygen outlet.

The hydrogen production system has different operation loads and different gas production rates, when the system operates at low load, only the second pneumatic film regulating valve 221 with smaller regulating range and higher regulating precision is used for regulating the pressure of the system, the third pneumatic film regulating valve 222 has larger regulating range, when the system operates at high load, the second pneumatic film regulating valve 221 and the third pneumatic film regulating valve 222 are simultaneously put into use, and the fourth pneumatic film regulating valve 231 and the fifth pneumatic film regulating valve 232 are used in the same way as the second pneumatic regulating valve and the third pneumatic regulating valve. Through the setting mode, different load conditions of the system can be adapted, so that the pressure during the operation of the system is not influenced by the operation load and is always kept stable.

Optionally, as shown in fig. 5 and 6, the first air quantity regulating valve group 22 and the second air quantity regulating valve group 23 may further include a first pneumatic ball valve 223, a second pneumatic ball valve 233, a first manual ball valve 224 and a second manual ball valve 234, the first pneumatic ball valve 223 is disposed upstream of the same pipe of the second pneumatic membrane regulating valve 221, the first manual ball valve 224 is disposed in parallel with other valves of the first air quantity regulating valve group 22, a first intersection point of a pipe where a branch of the first manual ball valve 224 is communicated with the hydrogen outlet is located upstream of the first pneumatic ball valve 223, and a second intersection point is located downstream of the second pneumatic membrane regulating valve 221 and the third pneumatic membrane regulating valve 222.

As shown in fig. 6, the second pneumatic ball valve 233 and the second manual ball valve 234 are arranged in a similar manner to the first pneumatic ball valve 223 and the first manual ball valve 224, and a first intersection point of a pipeline where the branch of the second manual ball valve 234 is communicated with the oxygen outlet is located upstream of the second pneumatic ball valve 233, and a second intersection point is located downstream of the fourth pneumatic membrane regulating valve 231 and the fifth pneumatic membrane regulating valve 232.

At system normal operating's in-process, the pneumatic membrane governing valve in the governing valve group just can satisfy daily operation's needs, but, the condition of interior hourglass can appear sometimes in the pneumatic membrane governing valve, can not regard as the valve of pressurize, and at this moment, pneumatic ball valve is compared in pneumatic membrane governing valve, and the structure is more reliable, and as the valve of guaranteeing system pressure, the operating pressure that can make in the system is stable, can not cause the system out of control because of the decompression.

In addition, when other valves of the first air regulating valve group 22 have problems and cannot normally work, the first manual ball valve 224 can be used for conducting and closing the hydrogen outlet, so that the situation that the pressure of the system cannot be regulated in an emergency, the system is out of control, and safety problems are caused is prevented.

Optionally, as an embodiment of the present disclosure, as shown in fig. 7, the water electrolysis hydrogen production system further includes a plurality of electrolyte circulation pumps 24, a plurality of electrolyte flow meters 25, and a plurality of third cut-off valves 26, and the electrolyte circulation pump 24, the electrolyte flow meter 25, and the third cut-off valve 26 are disposed on the electrolyte flow path 17 communicated with each electrolytic cell 2. An independent electrolyte flow path 17 is arranged for each electrolytic cell 2, an electrolyte circulating pump 24 and an electrolyte flowmeter 25 are arranged on the flow path, the electrolyte flow of the single electrolyte flow path 17 can be monitored, the electrolytic cells 2 can be operated independently or simultaneously, and an alkali liquor circulating system of the device is not influenced by the operation load and is kept stable all the time. Meanwhile, the third cut-off valve 26 is arranged on the electrolyte flow path 17 communicated with each electrolytic cell 2, and the third cut-off valve 26 is arranged at the downstream of the electrolyte circulating pump 24, so that the maintenance of the valve instrument can be carried out independently from the system by the equipment on the electrolyte flow path 17 connected with each electrolytic cell 2.

Optionally, a fourth shut-off valve 30 may be further provided on the electrolyte flow path 17 communicating with each electrolytic cell 2, and the fourth shut-off valve 30 may be provided upstream of the electrolyte circulation pump 24, and may cooperate with the third shut-off valve to shut off the pipeline where the electrolyte circulation pump 24 and the electrolyte flow meter 25 are located, so as to perform maintenance and replacement of the electrolyte circulation pump 24 and the electrolyte flow meter 25.

Optionally, as an embodiment of the present disclosure, the water electrolysis hydrogen production system further includes a gas washing device, the gas washing device includes a hydrogen washing tower 27 and an oxygen washing tower 28, hydrogen separated by the hydrogen separator 11 enters the hydrogen washing tower 27 through a pipeline, a gas washing return line borrow is provided in the middle section of the hydrogen washing tower 27 for connecting the gas washing return line 29, and the gas washing return line 29 is connected to the corresponding hydrogen separator 11.

The oxygen separated by the oxygen separator 12 enters the oxygen washing tower 28 through a pipeline, a washing gas return pipeline interface is arranged at the middle section of the oxygen washing tower 28 and used for connecting a washing gas return pipeline 29, and the washing gas return pipeline 29 is connected with the corresponding oxygen separator 12.

The hydrogen and oxygen separated by the gas-liquid separation device need to be washed to remove electrolyte contained in the gas, the hydrogen after gas-liquid separation is discharged into a hydrogen washing tower 27 and contacts with water in the washing tower, the washed hydrogen enters a hydrogen gas cooler through a pipeline above the washing tower, and the water after washing the hydrogen flows into the hydrogen separator 11 through a washing gas reflux pipeline 29 because the water contains the electrolyte.

In the oxygen scrubber 28, the scrubbed oxygen enters the oxygen gas cooler through a line above the oxygen scrubber 28, and the scrubbed oxygen-containing water is also returned to the oxygen separator train 14 through a return line.

The gas purity of the hydrogen and the oxygen cleaned by the washing tower is higher, meanwhile, as the hydrogen production system by water electrolysis prepares the hydrogen by decomposing water, the water quantity in the system is always consumed, and the refluxed gas washing water is also a liquid supplementing source of the hydrogen production system by water electrolysis.

Alternatively, a common pipeline of a plurality of electrolytic cells 2 is communicated with the gas-liquid separation device and the cooling device 16, and the hydrogen pipeline 3 and the oxygen pipeline 4 are converged to form a hydrogen main pipeline and an oxygen main pipeline which are connected with the hydrogen separator group 13 and the oxygen separator group 14.

Each hydrogen separator 11 and each oxygen separator 12 are connected with an electrolyte pipeline, the electrolyte pipeline connected with each hydrogen separator group 13 is a first electrolyte main path, the electrolyte pipeline connected with each oxygen separator group 14 is a second electrolyte main path, the first electrolyte main path and the second electrolyte main path are intersected to form an electrolyte cooling flow path and are connected with a cooler 19, and the cooler 19 is respectively connected with each electrolytic tank 2 through the electrolyte flow path. By sharing the pipeline, the integration degree of the system is improved, the occupied area of equipment is reduced, and the manufacturing cost of the equipment is also reduced.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that the various features described in the foregoing embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (10)

1. A water electrolysis hydrogen production system comprises an electrolyte supply flow path, a hydrogen gas collecting device and an oxygen gas collecting device, and is characterized by further comprising a gas-liquid separator (1) and a plurality of electrolytic tanks (2) connected with the gas-liquid separator (1), wherein the electrolyte supply flow path is connected with the electrolytic tanks (2) for supplying electrolyte to the electrolytic tanks (2), the electrolytic tanks (2) are used for electrolyzing water to generate hydrogen gas and oxygen gas, the gas-liquid separator (1) comprises an oxygen separator (12) and a hydrogen separator (11), the hydrogen separator (11) is used for carrying out gas-liquid separation on the hydrogen gas generated by the electrolytic tanks (2), the hydrogen gas collecting device is connected with the hydrogen separator (11) for collecting the hydrogen gas from the hydrogen separator (11), and the oxygen separator (12) is used for carrying out gas-liquid separation on the oxygen gas generated by the electrolytic tanks (2), the oxygen collecting device is connected with the oxygen separator (12) to collect the oxygen separated from the oxygen separator (12), wherein the plurality of electrolysis cells (2) are arranged in parallel, and each electrolysis cell (2) is respectively connected with the hydrogen separator (11) and the oxygen separator (12).

2. The system for producing hydrogen by electrolyzing water as claimed in claim 1, wherein each of the electrolysis tanks (2) is connected to the hydrogen separator (11) by a hydrogen pipeline (3), and each hydrogen pipeline (3) is provided with a first cut-off valve (5) and/or a first emptying valve (7); each electrolytic cell (2) is respectively connected with the oxygen separator (12) through an oxygen pipeline (4), and each oxygen pipeline (4) is provided with a second cut-off valve (6) and/or a second emptying valve (8).

3. The water electrolysis hydrogen production system according to claim 1, wherein the hydrogen separator (11) is in plurality, and the plurality of hydrogen separators (11) are communicated through a pipeline; the number of the oxygen separators (12) is multiple, and the oxygen separators (12) are communicated through pipelines.

4. The system for producing hydrogen by electrolyzing water as claimed in claim 3, wherein at least two hydrogen separators (11) of the plurality of hydrogen separators (11) are connected to form a hydrogen separator group (13), at least two oxygen separators (12) of the plurality of oxygen separators (12) are connected to form an oxygen separator group (14), the hydrogen separator group (13) and the oxygen separator group (14) are communicated with each other through a pipeline, and a switch valve (15) is arranged on the pipeline.

5. The system for producing hydrogen by electrolyzing water according to claim 1, further comprising a cooling device (16) and an electrolyte flow path (17), wherein the cooling device (16) comprises a cooler (19), a cooling liquid supply flow path (181) connected to the cooler (19), a cooling liquid return flow path (182) connected to the cooler (19), and a first regulating valve (20), and the first regulating valve (20) is disposed on the cooling liquid supply flow path (181) or the cooling liquid return flow path (182) for regulating the flow rate of the cooling liquid flowing through the cooler (19);

the electrolyte flow path (17) includes a first electrolyte flow path (171) and a second electrolyte flow path (172), one end of the first electrolyte flow path (171) is connected to the gas-liquid separator (1), the other end of the first electrolyte flow path (171) is connected to the cooler (19), one end of the second electrolyte flow path (172) is connected to the cooler (19), and the other end of the second electrolyte flow path (172) is connected to the corresponding electrolytic cell (2).

6. The system for hydrogen production by electrolysis of water according to claim 5, characterized in that the cooling device (16) further comprises a second regulating valve (21), the second regulating valve (21) being branched to the coolant supply flow path (181) or the coolant return flow path (182) to be disposed in parallel with the first regulating valve (20), one of the second regulating valve (21) and the first regulating valve (20) being a pneumatic butterfly valve, the other being a first pneumatic membrane regulating valve.

7. The water electrolysis hydrogen production system according to any one of claims 3-6, further comprising a first air quantity regulating valve group (22) and a second air quantity regulating valve group (23), wherein the first air quantity regulating valve group (22) is arranged at the downstream of the hydrogen outlet of the hydrogen separator (11) to regulate the air outlet quantity of the hydrogen outlet, and the second air quantity regulating valve group (23) is arranged at the downstream of the oxygen outlet of the oxygen separator (12) to regulate the air outlet quantity of the oxygen outlet;

the regulating range of the first gas quantity regulating valve group (22) for the gas output of the hydrogen outlet is different from the regulating range of the second gas quantity regulating valve group (23) for the gas output of the oxygen outlet.

8. The system for hydrogen production by electrolysis of water according to claim 7, characterized in that the first valve set (22) comprises a second pneumatic membrane regulating valve (221) and a third pneumatic membrane regulating valve (222), the second pneumatic membrane regulating valve (221) and the third pneumatic membrane regulating valve (222) are arranged in parallel on a pipeline communicating with the hydrogen outlet;

the second air quantity regulating valve group (23) comprises a fourth pneumatic film regulating valve (231) and a fifth pneumatic film regulating valve (232), and the fourth pneumatic film regulating valve (231) and the fifth pneumatic film regulating valve (232) are connected in parallel and are arranged on a pipeline communicated with the oxygen outlet.

9. Hydrogen production system from water electrolysis according to claim 5 or 6, characterized in that it further comprises a plurality of electrolyte circulation pumps (24), a plurality of electrolyte flow meters (25) and a plurality of third shut-off valves (26), said electrolyte circulation pumps (24), said electrolyte flow meters (25) and said third shut-off valves (26) being provided on said electrolyte flow path (17) communicating with each of said electrolytic cells (2).

10. The system for producing hydrogen by electrolyzing water as claimed in any of claims 4-6, further comprising a gas washing device comprising a hydrogen washing tower (27) and an oxygen washing tower (28), wherein the hydrogen separated by the hydrogen separator (11) enters the hydrogen washing tower (27) through a pipeline, a washing gas return pipeline interface is arranged in the middle section of the hydrogen washing tower (27) for connecting with a washing gas return pipeline (29), and the washing gas return pipeline (29) is connected with the corresponding hydrogen separator (11);

oxygen separated by the oxygen separator (12) enters the oxygen washing tower (28) through a pipeline, a washing gas return pipeline interface is arranged in the middle section of the oxygen washing tower (28) and used for being connected with a washing gas return pipeline (29), and the washing gas return pipeline (29) is connected with the corresponding oxygen separator (12).

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