Water electrolysis hydrogen production system

Abstract

The utility model discloses a system for producing hydrogen by electrolyzing water. The system comprises an alkali liquor electrolysis device, a gas-liquid separation device and an interlocking control device, the alkali liquor electrolysis device comprises an electrolytic bath and an alkali liquor circulating pump, the gas-liquid separation device comprises a gas-liquid separator, and the interlocking control device comprises an electromagnetic valve; the gas-liquid separation device further comprises a U-shaped pipe for separating gas and liquid by utilizing gravity and a jacketed pipe for separating gas and liquid by utilizing condensation; the U-shaped pipe is arranged between the electrolytic bath and the gas-liquid separator, and the alkali liquor self-flowing pipe is arranged between the low point of the U-shaped pipe and the alkali liquor circulating pump; the jacketed pipe is arranged between the U-shaped pipe and the gas-liquid separator, and an interlayer of the jacketed pipe is communicated with a chilled water pipeline. According to the water electrolysis hydrogen production system, the U-shaped pipe and the jacketed pipe are arranged, so that the gas-liquid separation efficiency of the water electrolysis hydrogen production system is improved, and the hydrogen production efficiency is improved; a washer and a cooler are removed, the whole equipment is simple, the occupied space is small, and the manufacturing cost is low; through regulation and control of the interlocking control device, the safety of the water electrolysis hydrogen production system is improved, and unattended operation can be achieved.

Description

Technical Field

[0001] The utility model relates to a hydrogen production system, in particular to a water electrolysis hydrogen production system. Background Art

[0002] In the context of the global joint promotion of sustainable energy development, hydrogen energy, which is abundant in sources, green, low-carbon and widely used, is one of the important carriers of energy transformation and development, and its manufacturing process has also attracted much attention. The gas post-processing process currently used in the general water electrolysis hydrogen production system is first gas-liquid separation, and then further separation of residual alkali liquid through washing, and finally the gas is cooled for storage and transportation. The equipment involved in this process includes separators, scrubbers and coolers, etc., and in order to improve the gas-liquid separation effect, two separators are set up continuously. Therefore, there are many types of equipment, large space occupation, high manufacturing cost, and complex interlocking control and poor safety. Summary of the invention

[0003] Purpose of the utility model: The purpose of the utility model is to provide a water electrolysis hydrogen production system with streamlined equipment and safe interlocking control.

[0004] Technical solution: The utility model provides a water electrolysis hydrogen production system, which includes an alkali liquid electrolysis device, a gas-liquid separation device and an interlocking control device; the alkali liquid electrolysis device includes an electrolytic cell and an alkali liquid circulation pump, the gas-liquid separation device includes a gas-liquid separator, and the interlocking control device includes a solenoid valve. The gas-liquid separation device also includes a U-shaped tube for separating gas and liquid by gravity and a jacketed tube for separating gas and liquid by condensation. The U-shaped tube is arranged between the electrolytic cell and the gas-liquid separator, and an alkali liquid gravity pipe is installed between the low point of the U-shaped tube and the alkali liquid circulation pump. When the gas and alkali liquid mixture passes through the U-shaped tube, the gas flows upward, and the alkali liquid gathers at the low point of the U-shaped tube, and flows to the alkali liquid circulation pump through the alkali liquid gravity pipe. Under the action of the alkali liquid circulation pump, the alkali liquid is continuously pumped into the electrolytic cell. The jacketed tube is arranged between the U-shaped tube and the gas-liquid separator, and the interlayer of the jacketed tube is connected to the chilled water pipeline. The gas is separated from the accompanying alkali solution by heat exchange of chilled water, and the alkali solution flows into the alkali solution circulation pump by gravity; the highest heat exchange effect can be achieved by keeping the chilled water and gas in countercurrent. If the system has abnormal working conditions, the relevant valves can be locked through the interlocking control device to keep the entire water electrolysis hydrogen production system safe.

[0005] Preferably, the gas-liquid separation device includes an oxygen gas circuit and a hydrogen gas circuit. The low points of the U-shaped tubes of the two gas circuits are connected through a pressure balance tube equipped with a solenoid valve. The solenoid valve automatically adjusts the pipeline pressure on the hydrogen and oxygen sides to improve system safety.

[0006] Preferably, the pressure balance pipe is provided with a solenoid valve bypass for use in valve maintenance.

[0007] Preferably, a regulating valve and a regulating valve bypass are installed at the inlet of the chilled water pipeline, and manual valves are provided before and after the regulating valve for maintenance purposes.

[0008] Preferably, a manual valve is installed at the outlet of the chilled water pipeline to serve as a barrier from the outside world.

[0009] Preferably, regulating valves and alkali solution discharge pipelines are installed before and after the alkali solution circulation pump so as to discharge excess alkali solution when the system is shut down.

[0010] Preferably, the gas-liquid separation device includes a gas analyzer provided at the gas outlet of the gas-liquid separator and equipped with a regulating valve and a three-way electric ball valve. Through detection by the analyzer, the gas with qualified purity is collected, otherwise it is discharged.

[0011] Preferably, the gas-liquid separator includes a drain pipe equipped with a hand valve and a solenoid valve, and automatic discharge is achieved through interlocking control.

[0012] Preferably, the water electrolysis hydrogen production system also includes a thermal resistor, which is arranged between the electrolytic cell and the alkali solution circulation pump, between the electrolytic cell and the U-shaped tube, between the U-shaped tube and the jacketed tube, between the jacketed tube and the gas-liquid separation device, or between the jacketed tube and the chilled water pipeline, and can monitor the temperature in the system in real time.

[0013] Preferably, the water electrolysis hydrogen production system also includes a pressure transmitter, which is arranged between the electrolytic cell and the alkali solution circulation pump, between the electrolytic cell and the U-shaped tube, between the U-shaped tube and the jacketed tube, between the jacketed tube and the gas-liquid separation device, or between the jacketed tube and the chilled water pipeline, and can monitor the pressure in the system in real time.

[0014] Beneficial effects: Compared with the prior art, the utility model has the following advantages: 1. By setting up the U-shaped tube and the jacketed tube, the gas-liquid separation efficiency of the water electrolysis hydrogen production system is improved, and the hydrogen production efficiency is improved. 2. The scrubber and cooler are removed, the overall equipment is streamlined, the space occupied is small, and the manufacturing cost is low. 3. Through the control of the interlocking control device, the safety of the water electrolysis hydrogen production system is improved, and unattended operation can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0016] The technical solution of the utility model is further described below in conjunction with the accompanying drawings.

[0017] like Figure 1This embodiment provides a water electrolysis hydrogen production system, including an alkali liquid electrolysis device, a gas-liquid separation device and an interlocking control device. The alkali liquid electrolysis device includes an electrolytic cell 7 and an alkali liquid circulation pump 6; the gas-liquid separation device includes a U-shaped tube 3, a jacket tube 4, an oxygen gas-liquid separator 1, a hydrogen gas-liquid separator 2, a gas analyzer and a drain pipe; the interlocking control device includes a solenoid valve 5, a regulating valve, and a three-way electric ball valve. The U-shaped tube 3 is arranged between the electrolytic cell 7 and the gas-liquid separator, and an alkali liquid gravity pipe is installed between the low point of the U-shaped tube 3 and the alkali liquid circulation pump 6; the jacket tube 4 is arranged between the U-shaped tube 3 and the gas-liquid separator, and the interlayer of the jacket tube 4 is connected to the chilled water pipeline, and the flow direction of the chilled water is opposite to that of the gas. The low points of the U-shaped tubes of the oxygen gas circuit and the hydrogen gas circuit are connected through a pressure balance pipe equipped with a solenoid valve 5. Regulating valves and alkali liquid discharge pipelines are installed before and after the alkali liquid circulation pump 6.

[0018] When the hydrogen produced by the electrolytic cell 7 passes through the U-shaped tube 3, the hydrogen flows upward; and the accompanying alkali liquid gathers at the low point of the U-shaped tube 3, and flows to the alkali liquid circulation pump 6 through the alkali liquid gravity pipe. Under the action of the alkali liquid circulation pump 6, the alkali liquid is continuously pumped into the electrolytic cell 7. The hydrogen then enters the jacket tube 4, and after heat exchange with the chilled water in the interlayer of the jacket tube 4, the hydrogen is separated from the accompanying alkali liquid, and continues to rise and enter the hydrogen gas-liquid separator 2; and the condensed alkali liquid flows into the alkali liquid circulation pump 6. Finally, the hydrogen flowing out of the hydrogen gas-liquid separator 2 is tested, and the hydrogen with qualified purity is collected, otherwise it is vented; the condensate produced by the hydrogen gas-liquid separator 2 is discharged through the drain pipe.

[0019] The same applies to the oxygen side. When the oxygen produced by the electrolytic cell 7 passes through the U-shaped tube 3, the oxygen flows upward; and the accompanying alkali liquid gathers at the low point of the U-shaped tube 3, and flows to the alkali liquid circulation pump 6 through the alkali liquid gravity pipe. Under the action of the alkali liquid circulation pump 6, the alkali liquid is continuously pumped into the electrolytic cell 7. The oxygen then enters the jacket tube 4, and after heat exchange with the chilled water in the interlayer of the jacket tube 4, the oxygen is separated from the accompanying alkali liquid, and continues to rise into the oxygen gas-liquid separator 1; and the condensed alkali liquid flows into the alkali liquid circulation pump 6. Finally, the oxygen flowing out of the oxygen gas-liquid separator 1 is tested, and the oxygen with qualified purity is collected, otherwise it is vented; the condensate produced by the oxygen gas-liquid separator 1 is discharged through the drain pipe.

Claims

1. A water electrolysis hydrogen production system, comprising an alkali solution electrolysis device, a gas-liquid separation device and an interlocking control device; the alkali solution electrolysis device comprises an electrolytic cell (7) and an alkali solution circulation pump (6), the gas-liquid separation device comprises a gas-liquid separator, and the interlocking control device comprises a solenoid valve (5); characterized in that: The gas-liquid separation device further comprises a U-shaped tube (3) for separating gas and liquid by gravity and a jacketed tube (4) for separating gas and liquid by condensation; the U-shaped tube (3) is arranged between the electrolytic cell (7) and the gas-liquid separator, and an alkali liquid gravity pipe is installed between the low point of the U-shaped tube (3) and the alkali liquid circulation pump (6); the jacketed tube (4) is arranged between the U-shaped tube (3) and the gas-liquid separator, and the interlayer of the jacketed tube (4) is connected to a chilled water pipeline.

2. A water electrolysis hydrogen production system according to claim 1, characterized in that: The gas-liquid separation device comprises an oxygen gas path and a hydrogen gas path, and the low points of the U-shaped tubes (3) of the two gas paths are connected via a pressure balancing tube equipped with a solenoid valve (5).

3. A water electrolysis hydrogen production system according to claim 2, characterized in that: The pressure balance pipe is provided with a solenoid valve (5) bypass.

4. A water electrolysis hydrogen production system according to claim 1, characterized in that: A regulating valve and a regulating valve bypass are installed at the inlet of the chilled water pipeline, and hand valves are arranged before and after the regulating valve.

5. A water electrolysis hydrogen production system according to claim 1, characterized in that: A hand valve is installed at the outlet of the chilled water pipeline.

6. A water electrolysis hydrogen production system according to claim 1, characterized in that: The alkali solution circulation pump (6) is provided with regulating valves and alkali solution discharge pipelines before and after.

7. A water electrolysis hydrogen production system according to claim 1, characterized in that: The gas-liquid separation device comprises a gas analyzer which is arranged at the gas outlet of the gas-liquid separator and is equipped with a regulating valve and a three-way electric ball valve.

8. A water electrolysis hydrogen production system according to claim 1, characterized in that: The gas-liquid separator comprises a drain pipe equipped with a hand valve and a solenoid valve (5).

9. A water electrolysis hydrogen production system according to claim 1, characterized in that: It also includes a thermal resistor, which is arranged between the electrolytic cell (7) and the alkali solution circulation pump (6), between the electrolytic cell (7) and the U-shaped tube (3), between the U-shaped tube (3) and the jacket tube (4), between the jacket tube (4) and the gas-liquid separation device, or between the jacket tube (4) and the chilled water pipeline.

10. A water electrolysis hydrogen production system according to claim 1, characterized in that: It also includes a pressure transmitter, which is arranged between the electrolytic cell (7) and the alkali liquid circulation pump (6), between the electrolytic cell (7) and the U-shaped tube (3), between the U-shaped tube (3) and the jacketed tube (4), between the jacketed tube (4) and the gas-liquid separation device, or between the jacketed tube (4) and the chilled water pipeline.

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