CN116815243A - Water electrolysis hydrogen production system - Google Patents

Abstract

The invention relates to the field of hydrogen production, and provides a water electrolysis hydrogen production system, which comprises: an electrolytic cell; a hydrogen separation module connected to the hydrogen side of the electrolyzer and used for receiving and separating hydrogen from the electrolyte; an oxygen separation module connected to the oxygen side of the electrolyzer and configured to receive and separate oxygen from the electrolyte; the liquid inlet of the circulating pump is respectively connected with the liquid outlet of the hydrogen separation module and the liquid outlet of the oxygen separation module, and the liquid outlet of the circulating pump is connected with the electrolytic tank; the liquid supplementing component is connected with a liquid inlet of the circulating pump; the concentration detection device is arranged between the circulating pump and the electrolytic tank and is used for detecting the concentration value of the electrolyte; and the control unit is connected with the fluid infusion assembly and the concentration detection device and controls the fluid infusion assembly to provide electrolyte based on the concentration value. The control unit controls the liquid supplementing component to provide electrolyte to the circulating pump based on the concentration value, so that the concentration of the electrolyte is not required to be detected manually, the electrolyte is not required to be added manually, and the automation degree of the water electrolysis hydrogen production system can be improved.

Description

Water electrolysis hydrogen production system

Technical Field

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

Background

Electrolytic water hydrogen production is the most widely used process route in industry at present, and is generally implemented by an electrolytic water hydrogen production system. In the related art, an electrolyzed water hydrogen production system includes an electrolyzer, a hydrogen separation module, an oxygen separation module, and a circulation pump. The electrolytic tank is used for generating hydrogen and oxygen by electrolysis water, the hydrogen separation module is connected with the hydrogen side of the electrolytic tank, and the oxygen separation module is connected with the oxygen side of the electrolytic tank. The hydrogen on the hydrogen side of the electrolytic tank enters a hydrogen separation module along with the electrolyte, and the hydrogen separation module is used for separating the electrolyte from the hydrogen. The oxygen on the oxygen side of the electrolytic cell enters an oxygen separation module along with the electrolyte, and the oxygen separation module is used for separating the electrolyte from the oxygen. The circulating pump is used for guiding the electrolyte separated by the hydrogen separation module and the electrolyte separated by the oxygen separation module to the electrolytic tank for recycling.

During operation, the hydrogen production system needs to be replenished with electrolyte to maintain electrolyte concentration, as oxygen and hydrogen both carry part of the electrolyte and reduce the electrolyte concentration. In the related art, the concentration of the electrolyte is usually detected by manual sampling, and the electrolyte is supplemented by manual operation based on the obtained concentration of the electrolyte, so that the hydrogen production system needs more manual intervention, and has high labor intensity and low automation degree.

Disclosure of Invention

The invention provides a water electrolysis hydrogen production system, which is used for solving the defect that the concentration of electrolyte is needed to be detected manually and the electrolyte is needed to be supplemented in the prior art, and realizing the effects of reducing the manual intervention degree and improving the automation level.

The invention provides a hydrogen production system by water electrolysis, which comprises:

an electrolytic tank for electrolyzing an electrolyte;

a hydrogen separation module connected to the hydrogen side of the electrolyzer and configured to receive and separate hydrogen from the electrolyte;

an oxygen separation module connected to the oxygen side of the electrolyzer and configured to receive and separate oxygen from the electrolyte;

the liquid inlet of the circulating pump is respectively connected with the liquid outlet of the hydrogen separation module and the liquid outlet of the oxygen separation module, and the liquid outlet of the circulating pump is connected with the electrolytic tank;

the liquid supplementing assembly is used for providing electrolyte and is connected with a liquid inlet of the circulating pump;

the concentration detection device is arranged between the circulating pump and the electrolytic tank and is used for detecting the concentration value of the electrolyte;

and the control unit is connected with the fluid infusion assembly and the concentration detection device and controls the fluid infusion assembly to provide electrolyte for the circulating pump based on the concentration value.

According to the electrolytic water hydrogen production system provided by the invention, the fluid infusion assembly comprises the fluid infusion box, the fluid infusion valve and the fluid infusion pump, wherein the fluid infusion box is used for storing electrolyte, the fluid infusion box is connected with the liquid inlet of the circulating pump through the fluid infusion valve and the fluid infusion pump, and the fluid infusion valve and the fluid infusion pump are connected with the control unit.

According to the electrolytic water hydrogen production system provided by the invention, the electrolytic water hydrogen production system further comprises a flow detection device and a reflux regulating valve, one end of the reflux regulating valve is connected with the liquid inlet of the circulating pump, the other end of the reflux regulating valve is connected between the liquid outlet of the circulating pump and the electrolytic tank, the flow detection device is arranged between the liquid outlet of the circulating pump and the electrolytic tank and is used for detecting the flow value of electrolyte, the reflux regulating valve and the flow detection device are both connected with the control unit, and the control unit controls the opening of the reflux regulating valve based on the flow value.

According to the electrolytic water hydrogen production system provided by the invention, the hydrogen separation module comprises a hydrogen separator, a hydrogen scrubber, a hydrogen cooler and a first gas-liquid separator which are sequentially connected, and the oxygen separation module comprises an oxygen separator, an oxygen scrubber, an oxygen cooler and a second gas-liquid separator which are sequentially connected;

the hydrogen separator and the oxygen separator are connected to form a communicating device, and the liquid outlet of the hydrogen separator and the liquid outlet of the oxygen separator are connected with the inlet of the circulating pump.

The invention provides a water electrolysis hydrogen production system, which also comprises a water pump and a water storage container for storing water, wherein the water pump is arranged in a pair, liquid inlets of the water pump are connected with the water storage container, a liquid outlet of one water pump is connected with the hydrogen scrubber, and a liquid outlet of the other water pump is connected with the oxygen scrubber;

the hydrogen scrubber is provided with a first overflow port which is connected with the hydrogen separator and used for overflowing the hydrogen separator, and the oxygen scrubber is provided with a second overflow port which is connected with the oxygen separator and used for overflowing the oxygen separator.

According to the water electrolysis hydrogen production system provided by the invention, the switch valve and/or the one-way valve are arranged between the hydrogen scrubber and the corresponding water pump, and the switch valve and/or the one-way valve are arranged between the oxygen scrubber and the corresponding water pump.

The invention provides a water electrolysis hydrogen production system, which further comprises a first detection device, a second detection device and a hydrogen discharge control valve, wherein the first detection device is used for detecting first liquid level information in the hydrogen separator, the second detection device is used for detecting second liquid level information in the oxygen separator, the hydrogen discharge control valve is connected with an exhaust port of the first gas-liquid separator, the first detection device, the second detection device and the hydrogen discharge control valve are connected with the control unit, and the control unit controls the opening degree of the hydrogen discharge control valve based on the first liquid level information and the second liquid level information.

According to the water electrolysis hydrogen production system provided by the invention, the hydrogen scrubber is provided with the first overflow port which is connected with the hydrogen separator and used for overflowing to the hydrogen separator, and at least one of the condensate port of the hydrogen cooler and the liquid discharge port of the first gas-liquid separator is connected with the hydrogen scrubber.

According to the electrolytic water hydrogen production system provided by the invention, the oxygen scrubber is provided with the second overflow port which is connected with the oxygen separator and used for overflowing to the oxygen separator, and at least one of the condensate port of the oxygen cooler and the liquid discharge port of the second gas-liquid separator is connected with the oxygen scrubber.

According to the water electrolysis hydrogen production system provided by the invention, at least one of the first cooler and the filter is arranged between the liquid outlet of the circulating pump and the electrolytic tank.

The electrolytic water hydrogen production system provided by the invention can electrolyze water through the electrolytic tank to generate hydrogen and oxygen, the hydrogen received from the hydrogen side of the electrolytic tank can be separated from the electrolyte through the hydrogen separation module, and the oxygen received from the oxygen side of the electrolytic tank can be separated from the electrolyte through the oxygen separation module. Electrolyte separated by the hydrogen separation module and electrolyte separated by the oxygen separation module can be pumped into the electrolytic tank through the circulating pump. The concentration value of the electrolyte discharged from the circulating pump and entering the electrolytic tank can be obtained through the concentration detection device, and the control unit can control the electrolyte supplementing component to provide the circulating pump with the electrolyte based on the concentration value and pump the supplemented electrolyte to the electrolytic tank through the circulating pump.

According to the electrolytic water hydrogen production system provided by the invention, the concentration value of the electrolyte is obtained through the concentration detection device between the circulating pump and the electrolytic tank, and the control unit controls the liquid supplementing component to provide the electrolyte for the circulating pump based on the concentration value, so that the automatic degree of the electrolytic water hydrogen production system can be improved without manually detecting the concentration of the electrolyte or manually adding the electrolyte.

In addition, because the water consumption of the hydrogen side and the water consumption of the oxygen side in the electrolytic tank are different, the concentration of the electrolyte in the electrolytic tank is not uniform, and the concentration of the electrolyte separated by the hydrogen separation module and the concentration of the electrolyte separated by the oxygen separation module are more uniform after being mixed by the circulating pump, so that the concentration of the electrolyte can be more accurately obtained by arranging the concentration detection device between the outlet of the circulating pump and the electrolytic tank.

In addition, the electrolyte is directly supplied to the circulating pump by the electrolyte supplementing component instead of being supplied to the hydrogen separation module or the oxygen separation module, so that the electrolyte supplied by the electrolyte supplementing component cannot cause the fluctuation of the liquid level of the electrolyte in the hydrogen separation module and the oxygen separation module, thereby ensuring the liquid sealing effect of the hydrogen separation module and the oxygen separation module and further ensuring the isolation effect of the hydrogen separation module and the oxygen separation module.

Drawings

In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a water electrolysis hydrogen production system provided in some embodiments of the invention;

FIG. 2 is a schematic diagram of a hydrogen separation module provided in some embodiments of the invention;

fig. 3 is a schematic view of the structure of an oxygen separation module provided in some embodiments of the invention.

Reference numerals:

1. an electrolytic cell; 2. a hydrogen separation module; 201. a hydrogen separator; 202. a hydrogen scrubber; 203. a hydrogen cooler; 204. a first gas-liquid separator; 205. a first overflow port; 206. a first sink; 3. an oxygen separation module; 301. an oxygen separator; 302. an oxygen scrubber; 303. an oxygen cooler; 304. a second gas-liquid separator; 305. a second overflow port; 306. a second sink; 4. a circulation pump; 5. a concentration detection device; 6. a fluid supplementing box; 7. a fluid supplementing valve; 8. a fluid supplementing pump; 9. a flow rate detection device; 10. a reflux regulating valve; 11. a water pump; 12. a water storage container; 13. a first detection device; 14. a second detection device; 15. a hydrogen gas discharge control valve; 16. a first cooler; 17. and (3) a filter.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The electrolytic water hydrogen production system provided in the embodiment of the present invention is described below with reference to fig. 1 to 3.

Specifically, the electrolytic water hydrogen production system comprises an electrolytic tank 1, a hydrogen separation module 2, an oxygen separation module 3, a circulating pump 4, a liquid supplementing component, a concentration detection device 5 and a control unit.

Wherein the electrolytic tank 1 is used for electrolyzing an electrolyte and generating hydrogen and oxygen. Specifically, the electrolyte enters the electrolytic tank 1 and then enters the cathode side and the anode side of the electrolytic tank 1 respectively, and under the action of the electrode catalyst layer and the direct current, part of water molecules in the electrolyte are decomposed, hydrogen is generated on the cathode side, and oxygen is generated on the anode side. Wherein hydrogen is discharged from the cathode side with the flowing electrolyte and oxygen is discharged from the oxygen side with the flowing electrolyte. I.e. the cell 1, electrolyzes the water in an electrolyte, which may be an alkaline solution, for example an electrolyte which may be a potassium hydroxide solution.

The hydrogen separation module 2 is connected to the hydrogen side of the electrolytic tank 1, and the hydrogen separation module 2 is configured to receive the hydrogen gas and the electrolyte discharged from the hydrogen side of the electrolytic tank 1 and separate the hydrogen gas and the electrolyte.

An oxygen separation module 3 is connected to the oxygen side of the electrolyzer 1, the oxygen separation module 3 being adapted to receive oxygen and electrolyte discharged from the oxygen side of the electrolyzer 1 and to separate hydrogen and electrolyte.

The inlet of circulating pump 4 is connected with the leakage fluid dram of hydrogen separation module 2 and the leakage fluid dram of oxygen separation module 3 respectively, and the leakage fluid dram of circulating pump 4 is connected with electrolysis trough 1, and circulating pump 4 can pump to electrolysis trough 1 with the electrolyte that hydrogen separation module 2 separated and the electrolyte that oxygen separation module 3 separated to reach electrolyte reuse's effect.

The fluid infusion assembly is used for providing electrolyte and is connected with the liquid inlet of the circulating pump 4, namely, the fluid infusion assembly supplements the electrolyte to the liquid inlet of the circulating pump 4.

A concentration detection means 5 is provided between the outlet of the circulation pump 4 and the electrolytic tank 1, the concentration detection means 5 being for detecting a concentration value of the electrolytic solution, that is, a concentration value of the electrolytic solution discharged from the circulation pump 4.

The control unit is connected with the fluid infusion assembly and the concentration detection device 5, and controls the fluid infusion assembly to supply electrolyte to the circulating pump 4 based on the concentration value detected by the concentration detection device 5. For example, the control unit may be a control system of a water electrolysis hydrogen production system.

By means of the arrangement, the concentration value of the electrolyte is obtained through the concentration detection device 5 between the circulating pump 4 and the electrolytic tank 1, the electrolyte is provided for the circulating pump 4 by the control unit based on the concentration value control fluid supplementing assembly, and the electrolyte concentration is not required to be detected manually or added manually, so that the automation degree of the electrolytic water hydrogen production system can be improved.

In addition, because the water consumption on the hydrogen side and the water consumption on the oxygen side in the electrolytic tank 1 are different, the concentration of the electrolyte in the electrolytic tank 1 is not uniform, and the concentration of the electrolyte separated by the hydrogen separation module 2 and the concentration of the electrolyte separated by the oxygen separation module 3 are more uniform after being mixed by the circulating pump 4, so that the concentration detection device 5 is arranged between the outlet of the circulating pump 4 and the electrolytic tank 1 in the embodiment of the invention, so that the concentration of the electrolyte can be more accurately obtained.

In addition, the electrolyte is directly provided to the circulating pump 4 by the electrolyte supplementing component instead of being provided to the hydrogen separation module 2 or the oxygen separation module 3, so that the electrolyte provided by the electrolyte supplementing component does not cause the fluctuation of the liquid level of the electrolyte in both the hydrogen separation module 2 and the oxygen separation module 3, thereby ensuring the liquid sealing effect of both the hydrogen separation module 2 and the oxygen separation module 3, further ensuring the isolation effect of both the hydrogen separation module 2 and the oxygen separation module 3, and avoiding the mixing of hydrogen and oxygen.

In some embodiments provided by the present invention, the refill assembly includes a refill tank 6, a refill valve 7, and a refill pump 8. The fluid infusion tank 6 is used for storing electrolyte, and the fluid infusion tank 6 is connected with a fluid inlet of the circulating pump 4 through a fluid infusion valve 7 and a fluid infusion pump 8, namely the fluid infusion valve 7 and the fluid infusion pump 8 are arranged between the fluid infusion tank 6 and the fluid inlet of the circulating pump 4. The fluid supplementing valve 7 and the fluid supplementing pump 8 are connected with a control unit. Wherein the fluid supplementing valve 7 can be a solenoid valve or a pneumatic valve.

In this embodiment, the concentration detection apparatus 5 transmits the concentration value to the control unit, and when the control unit determines that the concentration value is lower than the lower limit of the preset concentration threshold range, the control unit controls the opening of the liquid replenishing valve 7 and controls the opening of the liquid replenishing pump 8, and under the action of the liquid replenishing pump 8, the electrolyte in the liquid replenishing tank 6 runs to the liquid inlet of the circulating pump 4 and is pumped into the electrolytic tank 1 by the circulating pump 4. The control unit determines that the concentration value is higher than the lower limit of the preset concentration threshold range and lower than or equal to the upper limit of the preset concentration threshold range, controls the liquid supplementing valve 7 to be closed, and controls the liquid supplementing pump 8 to be closed. By providing the fluid-replenishing valve 7, the circulation pump 4 can be prevented from drawing the electrolyte from the fluid-replenishing tank 6 after the fluid-replenishing valve 7 is closed.

Alternatively, the number of the fluid-supplementing valves 7 is set as a pair, and the pair of fluid-supplementing valves 7 are respectively provided at the fluid inlet and the fluid outlet of the fluid-supplementing pump 8. In this way, the sealing effect can be improved, and the circulation pump 4 can be prevented from extracting the electrolyte from the fluid-replenishing valve 7 even more after the pair of fluid-replenishing valves 7 are closed.

Alternatively, the concentration detection means 5 may be a pH meter or a densitometer.

In some embodiments provided by the invention, at least one of the first cooler 16 and the filter 17 is provided between the liquid discharge port of the circulation pump 4 and the electrolytic tank 1. The first cooler 16 is provided to cool the electrolyte pumped by the circulation pump 4, thereby transferring heat generated during electrolysis to the outside of the system. For example, the first cooler 16 may be a heat exchanger. By providing the filter 17, solid impurities in the electrolyte can be filtered, and the solid impurities are prevented from entering the electrolytic tank 1.

In some embodiments provided by the present invention, the electrolyzed water hydrogen production system further comprises a flow detection apparatus 9 and a backflow regulating valve 10. One end of the reflux regulating valve 10 is connected with the liquid inlet of the circulating pump 4, and the other end of the reflux regulating valve 10 is connected between the liquid outlet of the circulating pump 4 and the electrolytic tank 1. Specifically, the connection position of the pipe line between the circulation pump 4 and the electrolytic tank 1 and the return flow regulating valve 10 is located upstream of the flow rate detecting device 9 so that the flow rate flowing through the return flow regulating valve 10 is the flow rate entering the electrolytic tank 1, thereby accurately obtaining the flow rate of the electrolyte entering the electrolytic tank 1.

Because the electrolytic water hydrogen production system has different load running conditions in the running process, in order to ensure the purity of hydrogen, the separation effect of the hydrogen separation module 2 and the separation effect of the oxygen separation module 3, the flow of electrolyte needs to be changed along with the load. In this embodiment, the flow rate value of the electrolyte pumped by the circulation pump 4 to the electrolytic tank 1 can be obtained by the flow rate detection device 9, and when the control unit determines that the flow rate value exceeds the target flow rate range required by the electrolytic water hydrogen production system, the control unit can control the opening of the reflux regulating valve 10 to increase so as to reduce the flow rate of the electrolyte entering the electrolytic tank 1, and when the control unit determines that the flow rate value is lower than the target flow rate range required by the electrolytic water hydrogen production system, the control unit can control the opening of the reflux regulating valve 10 to decrease so as to increase the flow rate of the electrolyte entering the electrolytic tank 1. Wherein the target flow range may be determined based on a load of the water electrolysis hydrogen production system.

By the arrangement, the flow of the electrolyte in the electrolytic tank 1 can be adjusted in a large range, a frequency converter is not required to be additionally arranged on the circulating pump 4, and the cost of equipment can be reduced.

Alternatively, the flow rate detection means 9 may be an electromagnetic flow meter, a mass flow meter, a vortex shedding flow meter or a rotameter. The back-flow regulating valve 10 may be a solenoid valve or a pneumatic valve.

In some embodiments provided by the present invention, the hydrogen separation module 2 includes a hydrogen separator 201, a hydrogen scrubber 202, a hydrogen cooler 203, and a first gas-liquid separator 204 connected in sequence.

Wherein a hydrogen separator 201 is connected to the hydrogen side of the electrolyzer 1 and is used for separating hydrogen from the liquid. Specifically, the hydrogen gas discharged from the hydrogen gas side and the electrolyte enter the hydrogen separator 201 together, wherein the hydrogen gas escapes from the gas outlet at the upper part of the hydrogen separator 201, and the electrolyte is discharged from the liquid outlet at the bottom of the hydrogen separator 201.

The hydrogen scrubber 202 is for containing a scrubbing liquid, and the hydrogen scrubber 202 is connected to an exhaust port of the hydrogen separator 201. The washing liquid is pure water or an electrolyte having a concentration lower than or equal to the concentration of the electrolyte in the electrolytic cell 1. The gas inlet of the hydrogen scrubber 202 is introduced below the liquid level of the scrubbing liquid through a pipeline or is arranged below the liquid level of the scrubbing liquid so that hydrogen can be introduced into the scrubbing liquid and the electrolyte entrained by the hydrogen is eliminated by the scrubbing liquid.

The hydrogen cooler 203 is connected to the exhaust port of the hydrogen scrubber 202, and the hydrogen cooler 203 is configured to cool hydrogen. The hydrogen cooler 203 may be a heat exchanger. For example, the hydrogen cooler 203 may cool the hydrogen to 20 degrees celsius to 40 degrees celsius.

The first gas-liquid separator 204 is connected to the exhaust port of the hydrogen cooler 203 and is used for separating moisture in the hydrogen. Alternatively, the first gas-liquid separator 204 may be a gravity separator, a centrifugal separator, or a filter separator. The hydrogen exiting the first gas-liquid separator 204 may enter a purification process.

In some embodiments provided by the present invention, the oxygen separation module 3 comprises an oxygen separator 301, an oxygen scrubber 302, an oxygen cooler 303 and a second gas-liquid separator 304 connected in sequence.

Wherein the oxygen separator 301 is connected to the oxygen side of the electrolyzer 1 and is used for separating oxygen from liquid. Specifically, oxygen and electrolyte are discharged from the oxygen side and enter the oxygen separator 301 together, wherein the oxygen escapes from the exhaust port at the upper part of the oxygen separator 301, and the electrolyte is discharged from the liquid discharge port at the bottom of the oxygen separator 301.

The oxygen scrubber 302 is for containing a scrubbing liquid, and the oxygen scrubber 302 is connected to an exhaust port of the oxygen separator 301. The washing liquid is pure water or an electrolyte having a concentration lower than or equal to the concentration of the electrolyte in the electrolytic cell 1. The gas inlet of the oxygen scrubber 302 is vented through a conduit below the level of the scrubbing liquid or is disposed below the level of the scrubbing liquid to enable oxygen to be vented into the scrubbing liquid and to eliminate oxygen entrained electrolyte from the scrubbing liquid.

An oxygen cooler 303 is connected to the exhaust of the oxygen scrubber 302, the oxygen cooler 303 being used for cooling the oxygen. The oxygen cooler 303 may be a heat exchanger. For example, the oxygen cooler 303 may cool the oxygen to 20 degrees celsius to 40 degrees celsius.

The second gas-liquid separator 304 is connected to the exhaust port of the oxygen cooler 303 and is used for separating moisture in the oxygen. Alternatively, the second gas-liquid separator 304 may be a gravity separator, a centrifugal separator, or a filter separator. Oxygen exiting the second gas-liquid separator 304 may be collected or vented.

In some embodiments provided by the invention, the hydrogen separator 201 and the hydrogen separator 201 are connected to each other to form a communicating vessel, and the liquid discharge port of the hydrogen separator 201 and the liquid discharge port of the oxygen separator 301 are both connected to the inlet of the circulation pump 4. Namely, the liquid outlet of the hydrogen separator 201 is the liquid outlet of the hydrogen separation module 2, and the liquid outlet of the oxygen separator 301 is the liquid outlet of the oxygen separator 301 module. With this arrangement, the electrolyte in the hydrogen separator 201 and the electrolyte in the oxygen separator 301 can be simultaneously pumped by the circulation pump 4.

In some embodiments provided by the present invention, the electrolyzed water hydrogen system further comprises a water pump 11 and a water storage vessel 12 for storing water. The water pumps 11 are provided in a pair, the water inlets of the water pumps 11 are connected to the water storage container 12, the liquid outlet of one of the water pumps 11 is connected to the hydrogen scrubber 202, and the liquid outlet of the other water pump is connected to the oxygen scrubber 302. I.e. a pair of water pumps 11 are used to fill the hydrogen scrubber 202 and the oxygen scrubber 302, respectively. The hydrogen scrubber 202 is provided with a first overflow 205 connected to the hydrogen separator 201 for overflow to the hydrogen separator 201, and the oxygen scrubber 302 is provided with a second overflow 305 connected to the oxygen separator 301 for overflow to the oxygen separator 301.

Because the water electrolysis hydrogen production system needs to consume water, the water electrolysis hydrogen production system needs to be supplemented with water to meet the requirement of continuous electrolysis hydrogen production. In this embodiment, the pair of water pumps 11 respectively guide pure water in the water storage container 12 into the hydrogen scrubber 202 and the oxygen scrubber 302, the liquid level of the washing liquid in the hydrogen scrubber 202 rises and flows into the hydrogen separator 201 through the first overflow port 205, the liquid level of the washing liquid in the oxygen scrubber 302 rises and flows into the oxygen separator 301 through the second overflow port 305, and finally returns to the electrolytic tank 1 under the action of the circulating pump 4.

In this embodiment, the water pump 11 is used to supplement water to the hydrogen scrubber 202 and the oxygen scrubber 302, so that the scrubbing liquid in the hydrogen scrubber 202 and the oxygen scrubber 302 enter the hydrogen separator 201 and the oxygen separator 301 through the first overflow port 205 and the second overflow port 305, respectively, so that the concentration of the scrubbing liquid in the hydrogen scrubber 202 and the oxygen scrubber 302 can be diluted, and the scrubbing effect of the hydrogen scrubber 202 and the oxygen scrubber 302 on the corresponding gas can be ensured.

On the other hand, in the prior art, the hydrogen separator 201 and the oxygen separator 301 are usually replenished with water in a timing water replenishing manner, and as the water electrolysis process continues, the concentration of the electrolyte gradually increases, and after the water replenishment is performed in a timing manner, the concentration of the electrolyte suddenly decreases, so that the concentration of the electrolyte is in a fluctuation state in a timing water replenishing manner, and the hydrogen production process is affected. In this embodiment, the pair of water pumps 11 continuously supplements water at the same time, so that the concentration of the electrolyte is always in the optimal concentration range, the fluctuation of the concentration of the electrolyte in the process of water electrolysis is reduced, and the normal and continuous process of water electrolysis is ensured. In addition, in the prior art, when water is replenished at regular time, the water levels in the hydrogen separator and the oxygen separator are severely fluctuated, so that bubbles formed by hydrogen or oxygen are mixed in electrolyte, and as the hydrogen separator and the oxygen separator form a communicating vessel, the bubbles possibly enter the oxygen separator along with the electrolyte, or the bubbles enter the hydrogen separator along with the electrolyte, so that the mixing of the hydrogen and the oxygen is caused, and the purity of the hydrogen or the purity of the oxygen is influenced. In this embodiment, the pair of water pumps 11 continuously supplements water at the same time, so that the severe fluctuation of the water level of the electrolyte can be reduced, and the generation of bubbles is reduced, thereby reducing the problem of mixing hydrogen and oxygen.

In addition, in the process of generating hydrogen by electrolyzing water, the amounts of gas generated by the cathode and the anode of the electrolyzer 1 are different, and the amounts of water consumed by the cathode and the anode are different, so that the amounts of electrolyte in the hydrogen separator 201 are different from the amounts of electrolyte in the oxygen separator 301, and the amounts of water required by the hydrogen separator 201 and the oxygen separator 301 are different, and by arranging a pair of water pumps, the corresponding required amounts of water can be continuously supplemented for the hydrogen separator 201 and the oxygen separator 301 respectively, so that the different water supplementing requirements of the hydrogen separator 201 and the oxygen separator 301 respectively are met.

In some embodiments provided by the present invention, an on-off valve and/or a one-way valve is provided between the hydrogen scrubber 202 and the corresponding water pump 11. Wherein, the on-off between the hydrogen scrubber 202 and the water pump 11 can be controlled by setting an on-off valve. By providing a one-way valve, the one-way valve is turned on in the direction from the water pump 11 to the hydrogen scrubber 202, thereby avoiding the countercurrent escape of hydrogen.

In some embodiments provided by the present invention, an on-off valve and/or a one-way valve is provided between the oxygen scrubber 302 and the corresponding water pump 11. Wherein, the on-off between the oxygen scrubber 302 and the water pump 11 can be controlled by setting an on-off valve. By providing a one-way valve, the one-way valve is turned on in the direction from the water pump 11 to the oxygen scrubber 302, thereby avoiding counter-current escape of oxygen.

Alternatively, the water pump 11 is a metering pump, so that the amount of water entering the hydrogen scrubber 202 or the oxygen scrubber 302 can be precisely adjusted.

In some embodiments provided herein, the electrolyzed water hydrogen system further comprises a first detection apparatus 13, a second detection apparatus 14, and a hydrogen emission control valve 15. The first detection means 13 is used for detecting first liquid level information in the hydrogen separator 201, and the second detection means 14 is used for detecting second liquid level information in the oxygen separator 301. The hydrogen gas discharge control valve 15 is connected to the exhaust port of the first gas-liquid separator 204 and is used to regulate the discharge pressure of hydrogen gas. The first detecting means 13, the second detecting means 14 and the hydrogen gas discharge control valve 15 are all connected to a control unit. The control unit controls the opening degree of the hydrogen gas discharge control valve 15 based on the first liquid level information and the second liquid level information.

Since the volume of hydrogen gas generated is different from the volume of oxygen gas generated during electrolysis of water, the pressure generated by hydrogen gas in the hydrogen separator 201 is different from the pressure generated by oxygen gas in the oxygen separator 301, thereby possibly resulting in different liquid levels of both the hydrogen separator 201 and the oxygen separator 301, which are liable to cause mixing of hydrogen gas and oxygen gas. In this embodiment, the first detecting device 13 and the second detecting device 14 detect the first liquid level information in the hydrogen separator 201 and the second liquid level information in the oxygen separator 301, respectively, and when the control unit determines that the difference between the first liquid level information and the second liquid level information is not in the difference threshold range, the control unit controls the opening of the hydrogen discharge control valve 15, so as to adjust the hydrogen pressure in the hydrogen separator 201, so that the liquid level difference in the oxygen separator 301 in the hydrogen separator 201 satisfies the difference threshold range. For example, when the liquid level in the hydrogen separator 201 is lower than the liquid level in the oxygen separator 301, the control unit controls the opening degree of the hydrogen discharge control valve 15 to be increased to decrease the pressure of the hydrogen in the hydrogen separator 201, so that the liquid level is raised. Otherwise, the opening degree of the hydrogen discharge control valve 15 is controlled to be decreased to increase the pressure of the hydrogen in the hydrogen separator 201 and decrease the liquid level.

Optionally, at least one of the first detection device 13 and the second detection device 14 is provided as a level gauge or a differential pressure transmitter.

In some embodiments provided by the invention, the hydrogen scrubber 202 is provided with a first overflow port 205 connected with the hydrogen separator 201 and used for overflowing to the hydrogen separator 201, and at least one of a condensate port of the hydrogen cooler 203 and a liquid discharge port of the first gas-liquid separator 204 is connected with the hydrogen scrubber 202, so that the condenser generated by the hydrogen condenser and/or the liquid separated by the first gas-liquid separator 204 is introduced into the hydrogen scrubber 202, thereby realizing zero discharge of electrolyte and achieving the effect of recycling the electrolyte.

Optionally, the hydrogen scrubber 202 is provided with a first converging port 206, and the condensate port of the hydrogen cooler 203 and the liquid discharge port of the first gas-liquid separator 204 are connected to the first converging port 206. The height of the liquid outlet of the first gas-liquid separator 204 is higher than the height of the first converging port 206, so that the liquid discharged from the first gas-liquid separator 204 can enter the hydrogen scrubber 202 under the action of gravity without power pumping. Likewise, the condensate port of the hydrogen cooler 203 is located at a higher level than the first sink 206. So configured, the liquid exiting the hydrogen cooler 203 can enter the hydrogen scrubber 202 under the force of gravity without the need for powered pumping.

Further, the height of the first sink 206 is lower than that of the first overflow 205, so that the first sink 206 is always below the liquid level of the hydrogen scrubber 202, and the liquid in the hydrogen scrubber 202 can seal the first sink 206, i.e. a liquid seal can be maintained during operation, so that hydrogen in the hydrogen scrubber 202 cannot escape through the first sink 206.

In some embodiments provided by the invention, the oxygen scrubber 302 is provided with a second overflow port 305 connected with the oxygen separator 301 and used for overflowing to the oxygen separator 301, and at least one of a condensate port of the oxygen cooler 303 and a liquid discharge port of the second gas-liquid separator 304 is connected with the oxygen scrubber 302 so as to be used for guiding the liquid separated by the condenser generated by the oxygen condenser and/or the second gas-liquid separator 304 into the oxygen scrubber 302, thereby realizing zero discharge of electrolyte and achieving the effect of recycling the electrolyte.

Optionally, the oxygen scrubber 302 is provided with a second flow converging port 306, and the condensate port of the oxygen cooler 303 and the liquid discharge port of the second gas-liquid separator 304 are connected to the second flow converging port 306. The height of the liquid outlet of the second gas-liquid separator 304 is higher than the height of the second converging port 306, so that the liquid discharged from the second gas-liquid separator 304 can enter the oxygen scrubber 302 under the action of gravity without power pumping. Likewise, the condensate port of the oxygen cooler 303 is located at a higher level than the second sink 306. So configured, the liquid exiting the oxygen cooler 303 may enter the oxygen scrubber 302 under the force of gravity without the need for powered pumping.

Further, the height of the second sink 306 is lower than that of the second overflow 305, so that the second sink 306 is always below the liquid level of the oxygen scrubber 302, and the liquid in the oxygen scrubber 302 can seal the second sink 306, i.e. can maintain a liquid seal during operation, so that oxygen in the oxygen scrubber 302 cannot escape through the second sink 306.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

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

an electrolytic tank (1) for electrolyzing an electrolyte;

a hydrogen separation module (2) connected to the hydrogen side of the electrolyzer (1) and used for receiving and separating hydrogen from the electrolyte;

an oxygen separation module (3) connected to the oxygen side of the electrolyzer (1) and adapted to receive and separate oxygen from the electrolyte;

the liquid inlet of the circulating pump (4) is respectively connected with the liquid outlet of the hydrogen separation module (2) and the liquid outlet of the oxygen separation module (3), and the liquid outlet of the circulating pump (4) is connected with the electrolytic tank (1);

the liquid supplementing assembly is used for providing electrolyte and is connected with a liquid inlet of the circulating pump (4);

a concentration detection device (5) which is arranged between the circulating pump (4) and the electrolytic tank (1) and is used for detecting the concentration value of the electrolyte;

and a control unit which is connected with the fluid replacement component and the concentration detection device (5) and controls the fluid replacement component to supply electrolyte to the circulating pump (4) based on the concentration value.

2. The electrolytic water hydrogen production system according to claim 1, wherein the fluid replacement assembly comprises a fluid replacement tank (6), a fluid replacement valve (7) and a fluid replacement pump (8), the fluid replacement tank (6) is used for storing electrolyte, the fluid replacement tank (6) is connected with a fluid inlet of the circulating pump (4) through the fluid replacement valve (7) and the fluid replacement pump (8), and the fluid replacement valve (7) and the fluid replacement pump (8) are connected with the control unit.

3. The electrolytic water hydrogen production system according to claim 1, further comprising a flow detection device (9) and a reflux regulating valve (10), wherein one end of the reflux regulating valve (10) is connected with a liquid inlet of the circulating pump (4), the other end of the reflux regulating valve (10) is connected between a liquid outlet of the circulating pump (4) and the electrolytic tank (1), the flow detection device (9) is arranged between the liquid outlet of the circulating pump (4) and the electrolytic tank (1) and is used for detecting a flow value of electrolyte, the reflux regulating valve (10) and the flow detection device (9) are both connected with the control unit, and the control unit controls the opening degree of the reflux regulating valve (10) based on the flow value.

4. A water electrolysis hydrogen production system according to any of claims 1-3, wherein the hydrogen separation module (2) comprises a hydrogen separator (201), a hydrogen scrubber (202), a hydrogen cooler (203) and a first gas-liquid separator (204) connected in sequence, and the oxygen separation module (3) comprises an oxygen separator (301), an oxygen scrubber (302), an oxygen cooler (303) and a second gas-liquid separator (304) connected in sequence;

the hydrogen separator (201) and the oxygen separator (301) are connected to form a communicating device, and a liquid outlet of the hydrogen separator (201) and a liquid outlet of the oxygen separator (301) are connected with an inlet of the circulating pump (4).

5. The electrolytic water hydrogen production system according to claim 4, further comprising a water pump (11) and a water storage container (12) for storing water, wherein the water pump (11) is provided in a pair, liquid inlets of the water pump (11) of a pair are connected with the water storage container (12), liquid outlets of one of the water pump (11) of a pair are connected with the hydrogen scrubber (202), and liquid outlets of the other water pump are connected with the oxygen scrubber (302);

the hydrogen scrubber (202) is provided with a first overflow port (205) connected with the hydrogen separator (201) and used for overflowing the hydrogen separator (201), and the oxygen scrubber (302) is provided with a second overflow port (305) connected with the oxygen separator (301) and used for overflowing the oxygen separator (301).

6. The electrolytic water hydrogen production system according to claim 5, wherein an on-off valve and/or a one-way valve is provided between the hydrogen scrubber (202) and the corresponding water pump (11), and an on-off valve and/or a one-way valve is provided between the oxygen scrubber (302) and the corresponding water pump (11).

7. The electrolyzed water hydrogen production system as defined in claim 4 further comprising a first detection apparatus (13), a second detection apparatus (14) and a hydrogen discharge control valve (15), wherein the first detection apparatus (13) is configured to detect first liquid level information in the hydrogen separator (201), the second detection apparatus (14) is configured to detect second liquid level information in the oxygen separator (301), the hydrogen discharge control valve (15) is connected to an exhaust port of the first gas-liquid separator (204), and the first detection apparatus (13), the second detection apparatus (14) and the hydrogen discharge control valve (15) are connected to the control unit, and the control unit controls an opening degree of the hydrogen discharge control valve (15) based on the first liquid level information and the second liquid level information.

8. The electrolytic water fed hydrogen production system according to claim 4, wherein the hydrogen scrubber (202) is provided with a first overflow port (205) connected to the hydrogen separator (201) for overflowing the hydrogen separator (201), and at least one of a condensate port of the hydrogen cooler (203) and a drain port of the first gas-liquid separator (204) is connected to the hydrogen scrubber (202).

9. The electrolytic water fed hydrogen production system according to claim 4, wherein the oxygen scrubber (302) is provided with a second overflow port (305) connected to the oxygen separator (301) for overflowing the oxygen separator (301), and at least one of a condensate port of the oxygen cooler (303) and a drain port of the second gas-liquid separator (304) is connected to the oxygen scrubber (302).

10. The water electrolysis hydrogen production system according to claim 1, wherein at least one of a first cooler (16) and a filter (17) is further provided between the liquid discharge port of the circulation pump (4) and the electrolytic tank (1).