Electrolytic bath testing device

Abstract

The utility model discloses an electrolytic bath testing device which comprises an electrolytic bath and an anode separator, an anode outlet of the electrolytic bath is communicated with the anode separator, the bottom of the anode separator is connected with an anode liquid discharge pipeline, and the anode liquid discharge pipeline is respectively connected with the anode separator and an anode inlet of the electrolytic bath through a water return pipeline and a liquid return pipeline. A flow meter is arranged on the liquid return pipeline, and a shunt electromagnetic valve and a flow proportional valve are sequentially arranged on the water return pipeline. According to the utility model, fluid input by the cathode liquid discharge pipeline can be shunted through the water return pipeline, so that the fluid returned to the inlet of the electrolytic bath through the liquid return pipeline is reduced, the circulating water pump has constant voltage under small flow, the shunting electromagnetic valve is normally opened, and the flow of the water return pipeline and the liquid return pipeline can be adjusted through the flow proportional valve; and under the condition of large flow, the shunting electromagnetic valve is closed, and the requirement that the fluid in the liquid return pipeline is large flow can be met by controlling the pressure transformation of the circulating water pump, so that the flow requirements of the electrolytic bath in different power sections are met.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electrolytic water hydrogen production, more particularly to an electrolytic cell testing device. BACKGROUND

[0002] With the urgent demand for sustainable energy and the challenge of climate change, hydrogen energy, as a kind of efficient, clean and low-carbon energy carrier, has gradually become an important direction of energy transformation. Electrolytic water hydrogen production, as a green and efficient way of hydrogen production, is receiving more and more attention because it can achieve zero carbon emissions and has strong coupling with renewable energy such as wind power and photovoltaic. In recent years, electrolytic water hydrogen production technology has made significant progress. From traditional alkaline electrolytic water technology to proton exchange membrane (PEM) electrolysis, anion exchange membrane (AEM) electrolysis, and high-temperature solid oxide electrolysis (SOEC), the efficiency and economy of electrolytic water hydrogen production are continuously improving.

[0003] In the electrolytic water technology, the wide range adjustment of the circulation electrolyte flow rate is one of the key means to improve the electrolysis efficiency, prolong the equipment life and optimize the system performance. The circulation flow rate of electrolyte directly affects the mass transfer efficiency on the reaction interface, the heat management of the electrolytic cell and the reaction stability on the electrode surface. In the process of electrolytic water, the gas generated by the electrode reaction such as hydrogen and oxygen will form a gas cover layer on the electrode surface, which hinders the diffusion of ions in the electrolyte to the electrode surface, thus reducing the current efficiency and hydrogen production efficiency. By adjusting the circulation flow rate of electrolyte, the gas cover layer can be effectively flushed, the mass transfer effect of ions can be enhanced, and the reaction can be carried out more efficiently. In addition, a large amount of heat will be generated during the electrolysis process, especially under high current density conditions, which may cause the temperature of the electrolyte to rise, thus increasing the corrosion rate of the system and reducing the stability of the equipment. By increasing the flow rate of electrolyte, the reaction heat can be quickly removed to maintain the heat balance of the system, thus prolonging the service life of the equipment.

[0004] On the other hand, reasonable flow rate adjustment can also reduce the energy consumption of the system and improve the overall economy. When the electrolytic cell is in a low load or low current density operating state, a moderate reduction in circulation flow rate can reduce the energy consumption of the circulating pump without significantly affecting the mass transfer or heat management performance. Conversely, under high load or high current density operation, the circulation of high flow rate can effectively cope with the high mass transfer demand and heat load of the system, ensuring the hydrogen production efficiency and equipment safety. In addition, different electrolyte components and concentrations also have different requirements for circulation flow rate. For example, in an alkaline electrolytic water system, high concentration KOH solution has high viscosity and low thermal conductivity, so a higher flow rate is required to improve the fluidity of the electrolyte and the heat transfer effect. In a proton exchange membrane (PEM) electrolytic cell, the electrolyte is usually pure water, and the low viscosity characteristics of the electrolyte allow more flexible flow control to adapt to different operating conditions.

[0005] Flow regulation also has a significant impact on the stability and uniformity of the system. In large-scale water electrolysis systems, due to the uneven distribution of current and temperature inside the electrolytic cell, proper flow regulation can form a uniform flow field distribution in the cell body, avoiding local overheating or insufficient ion concentration problems, thereby improving the stability and performance consistency of the overall system. In addition, the wide range of flow regulation capability also provides support for switching between different operating modes. For example, in the case of grid peak shaving or renewable energy sources such as wind and solar with high volatility, the electrolytic cell needs to be frequently operated in different power ranges, which puts higher requirements on the flow regulation capability. Utility content

[0006] The technical problem to be solved by the utility model lies in how to meet the flow demand of electrolytic cells of different power segments.

[0007] The utility model solves the above technical problems through the following technical scheme: an electrolytic cell testing device, including electrolytic cell, anode separator, the anode outlet of electrolytic cell is communicated with anode separator, the bottom of anode separator is connected with anode liquid discharge pipeline, anode liquid discharge pipeline is connected with anode separator, electrolytic cell anode inlet respectively through backwater pipeline, back liquid pipeline, be equipped with flowmeter on back liquid pipeline, be equipped with shunt solenoid valve, flow proportional valve in proper order on backwater pipeline, be equipped with circulating water pump on anode liquid discharge pipeline.

[0008] The fluid input by the cathode liquid discharge pipeline can be shunted through the backwater pipeline, thereby reducing the fluid returned to the electrolytic cell inlet through the back liquid pipeline. At low flow, the circulating water pump is set to a constant voltage, and the shunt solenoid valve is always open. The flow proportional valve can adjust the flow of the backwater pipeline and the back liquid pipeline, thereby ensuring that the fluid in the back liquid pipeline is at a low flow. At high flow, the shunt solenoid valve is closed, and the circulating water pump is controlled to change the voltage, thereby meeting the requirement of high flow of the fluid in the back liquid pipeline, and thereby meeting the flow demand of electrolytic cells of different power segments.

[0009] As a preferred technical scheme, an electrolytic cell anode inlet temperature sensor is arranged on the back liquid pipeline, and an electric heating belt is wound outside the back liquid pipeline.

[0010] As a preferred technical scheme, a deionization resin tank, a filter, a heater, and a heater outlet temperature sensor are sequentially arranged on the anode liquid discharge pipeline. The filter outlet is located upstream of the circulating water pump, and the heater inlet is located downstream of the circulating water pump.

[0011] As a preferred technical scheme, the anode liquid discharge pipeline is connected to the backwater pipeline and the back liquid pipeline through a tee joint, and an electric conductivity sensor is connected to the tee joint.

[0012] As a preferred technical scheme, the anode separator is provided with an anode high liquid level sensor, an anode middle liquid level sensor and an anode low liquid level sensor.

[0013] As a preferred technical scheme, the anode separator is provided with an anode high liquid level sensor, an anode middle liquid level sensor and an anode low liquid level sensor.

[0014] As a preferred technical scheme, the anode separator is provided with an anode high liquid level sensor, an anode middle liquid level sensor and an anode low liquid level sensor.

[0015] As a preferred technical scheme, the anode separator is provided with an anode high liquid level sensor, an anode middle liquid level sensor and an anode low liquid level sensor.

[0016] As a preferred technical scheme, the anode separator is provided with an anode high liquid level sensor, an anode middle liquid level sensor and an anode low liquid level sensor.

[0017] As a preferred technical scheme, the anode separator is provided with an anode high liquid level sensor, an anode middle liquid level sensor and an anode low liquid level sensor.

[0018] The beneficial effects of the present application are as follows:

[0019] (1) In the present application, the backwater pipeline can split the fluid input by the cathode liquid discharge pipeline, thereby reducing the fluid returned to the electrolytic tank inlet through the back liquid pipeline. Under small flow, the circulating water pump is fixed voltage, the shunt electromagnetic valve is always open, and the flow proportional valve can adjust the flow of the backwater pipeline and the back liquid pipeline, thereby ensuring that the fluid in the back liquid pipeline is small flow. Under large flow, the shunt electromagnetic valve is closed, and the circulating water pump is controlled to change the voltage, so as to meet the large flow of the back liquid pipeline, thereby meeting the flow demand of electrolytic tanks of different power sections.

[0020] (2) In the present application, the backwater pipeline can split the fluid input by the cathode liquid discharge pipeline, and the flow proportional valve can also be adjusted to avoid dry burning of the electric heater. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The overall structure schematic diagram provided by the embodiment of the present application is shown in the figure.

[0022] Reference numerals: 1. Electrolytic cell; 2. Pure water tank; 3. Make-up water pump; 4. Make-up water solenoid valve; 5. Anode separator; 6. Cathode separator; 7. Deionization resin tank; 8. Filter; 9. Circulating water pump; 10. Oxygen-side drain solenoid valve; 11. Heater; 12. Heater outlet temperature sensor; 13. Conductivity sensor; 14. Flow divider solenoid valve; 15. Flow proportional valve; 16. Flow meter; 17. Electric heating belt; 18. Electrolytic cell anode inlet temperature sensor; 19. 20. Anode pressure sensor; 21. Anode back pressure valve; 22. Cathode drain needle valve; 23. Cathode drain solenoid valve; 24. Cathode pressure sensor; 25. High liquid level sensor for cathode separator; 26. Medium liquid level sensor for cathode separator; 27. Low liquid level sensor for cathode separator; 28. Cathode back pressure valve; 29. ​​DC power supply; 30. High liquid level sensor for anode separator; 31. Medium liquid level sensor for anode separator; 32. Low liquid level sensor for anode separator; 33. Wastewater tank. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] See Figure 1 An electrolytic cell testing device includes an electrolytic cell 1, an anode separator 5, a cathode separator 6, a pure water supply unit, and a DC power supply 28. The DC power supply 28 supplies power to the electrolytic cell 1. The positive terminal of the DC power supply 28 is connected to the anode of the electrolytic cell 1, and the negative terminal is connected to the cathode of the electrolytic cell 1. The anode outlet of the electrolytic cell 1 is connected to the anode separator 5 through an anode output pipe. An anode exhaust pipe is connected to the middle of the top of the anode separator 5, and an anode drain pipe is connected to the bottom. The pure water supply unit is used to replenish water to the anode separator 5 and is connected to the anode separator 5 through a pure water supply pipe. The anode drain pipe is also connected to a wastewater tank 32 through a wastewater recovery pipe. The anode drain pipe is connected to the anode separator 5 through a return water pipe and to the anode inlet of the electrolytic cell 1 through a return liquid pipe. The cathode outlet of the electrolytic cell 1 is connected to the cathode separator 6 through a cathode output pipe. A cathode exhaust pipe is connected to the middle of the top of the cathode separator 6, and the bottom is connected to the wastewater tank 32 through a cathode drain pipe.

[0025] The backwater pipeline and the back liquid pipeline are connected in parallel, the backwater pipeline is sequentially provided with a shunt electromagnetic valve 14 and a flow proportional valve 15, the back liquid pipeline is provided with a flow meter 16 and an anode inlet temperature sensor 18 of an electrolytic tank, an electric heating belt 17 is arranged outside the back liquid pipeline, the electric heating belt 17 is arranged outside the back liquid pipeline in a winding mode, the anode inlet temperature sensor 18 is arranged at one end of the back liquid pipeline close to the anode inlet, the back liquid pipeline and the backwater pipeline are connected with the anode liquid discharge pipeline through a three-way joint, the three-way joint is further connected with an electric conductivity sensor 13, the anode liquid discharge pipeline is sequentially provided with a deionization resin tank 7, a filter 8, a circulating water pump 9, a heater 11 and a heater outlet temperature sensor 12, the anode liquid discharge pipeline is connected with the waste water recovery pipeline, the anode liquid discharge pipeline is provided with an anode discharge needle valve 21 and an anode discharge electromagnetic valve 22, a three-way valve is arranged at the connection position of the anode liquid discharge pipeline and the waste water recovery pipeline, one end of the three-way valve is connected with the waste water recovery pipeline, and the other two ends are respectively connected with two sections of the anode liquid discharge pipeline, i.e., one section provided with the filter 8 and one section provided with the circulating water pump 9.

[0026] The anode exhaust pipeline is provided with an anode back pressure valve 20, the anode separator is provided with an anode pressure sensor 19, the opening degree of the anode back pressure valve 20 can be adjusted through the value of the anode pressure sensor 19, so as to adjust the exhaust rate of the anode exhaust pipeline, the anode separator 5 is provided with an anode separator high liquid level sensor 29, an anode separator medium liquid level sensor 30 and an anode separator low liquid level sensor 31, a transparent hose is connected to the side hole of the anode separator 5, and the anode separator high liquid level sensor 29, the anode separator medium liquid level sensor 30 and the anode separator low liquid level sensor 31 are connected to the transparent hose, for monitoring the liquid level of the anode separator 5.

[0027] The pure water supply unit comprises a pure water tank 2, a water supplement pump 3, a water supplement electromagnetic valve 4 and a pure water supply pipeline, the pure water supply pipeline is sequentially provided with the pure water tank 2, the water supplement pump 3 and the water supplement electromagnetic valve 4, a high-purity deionized water is provided from an external water source to the pure water tank 2, and the high-purity deionized water in the pure water tank 2 is supplemented to the circulating electrolyte system, i.e., the electrolytic tank 1, through the water supplement pump 3 and the water supplement electromagnetic valve 4.

[0028] The cathode exhaust pipeline is provided with a cathode back pressure valve 27, the cathode exhaust pipeline is in a hard pipe structure, the cathode separator 6 is provided with a cathode pressure sensor 23, the opening degree of the cathode back pressure valve 27 can be adjusted through the detected value of the cathode pressure sensor 23, the cathode separator 6 is provided with a cathode separator high liquid level sensor 24, a cathode separator medium liquid level sensor 25 and a cathode separator low liquid level sensor 26, another transparent hose is connected to the side hole of the cathode separator 6, and the cathode separator high liquid level sensor 24, the cathode separator medium liquid level sensor 25 and the cathode separator low liquid level sensor 26 are arranged on the transparent hose, for monitoring the liquid level of the cathode separator 6.

[0029] Working principle:

[0030] When the electrolyte enters the anode separator 5 through the water replenishing pump 3 and the water replenishing electromagnetic valve 4, the electrolyte is replenished to the liquid level sensor 30 in the anode separator, and then the circulating water pump 9 is started to start circulating the electrolyte. When the electrolytic tank 1 needs a small flow, the circulating water pump 9 is given a constant voltage, the shunt electromagnetic valve 14 is always in an open state, the flow proportional valve 15 is adjusted and the electrolyte entering the electrolytic tank 1 is input in a small flow, and the flow in the backwater pipeline is greater than the flow in the backwater pipeline. Then, the minimum and maximum flow of the circulating water pump 9 at the constant voltage A is found by adjusting the flow proportional valve 15, and is recorded. Because the flow proportional valve 15 changes with temperature, the full-closed opening degree may not be suitable for high temperature, and the flow proportional valve 15 cannot be closed at high temperature. Therefore, the shunt electromagnetic valve 14 is arranged in front of the flow proportional valve 15, and when the circulating electrolyte flow reaching the full-closed flow proportional valve 15 is monitored, the shunt electromagnetic valve 14 is closed, and then the voltage of the circulating water pump 9 is controlled to realize accurate control of the flow.

[0031] It should be noted that the circulating water pump 9 in the embodiment is a variable pressure pump, so that the circulating water pump 9 is given a constant voltage to control the small flow of the circulating electrolyte through the flow proportional valve 15, which can accurately control the flow of the circulating alkali solution and avoid the phenomenon of dry burning of the heater 11 due to too small flow. After reaching the maximum flow of the constant voltage, the circulating water pump 9 is switched to variable voltage control to control the flow of the circulating alkali solution.

[0032] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalent ones. The modifications or replacements do not change the essence of the corresponding technical solutions, and do not deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An electrolytic cell testing device, characterized in that, It includes an electrolytic cell and an anode separator. The anode outlet of the electrolytic cell is connected to the anode separator. The bottom of the anode separator is connected to an anode drain pipe. The anode drain pipe is connected to the anode separator and the anode inlet of the electrolytic cell through a return water pipe and a return liquid pipe, respectively. A flow meter is installed on the return liquid pipe. A flow divider solenoid valve and a flow proportioning valve are installed in sequence on the return water pipe. A circulating water pump is installed on the anode drain pipe.

2. The electrolytic cell testing device according to claim 1, characterized in that, The return liquid pipeline is equipped with an electrolytic cell anode inlet temperature sensor, and an electric heating belt is wrapped around the outside of the return liquid pipeline.

3. An electrolytic cell testing device according to claim 1, characterized in that, The anode drain line is sequentially equipped with a deionized resin tank, a filter, a heater, and a heater outlet temperature sensor. The filter outlet is located upstream of the circulating water pump, and the heater inlet is located downstream of the circulating water pump.

4. An electrolytic cell testing device according to claim 1, characterized in that, The anode drain line is connected to the return water line and the return liquid line via a T-joint, and a conductivity sensor is connected to the T-joint.

5. An electrolytic cell testing device according to claim 1, characterized in that, It also includes a pure water tank, a water replenishment pump, a water replenishment solenoid valve, and a pure water supply pipeline. The pure water supply pipeline is equipped with a pure water tank, a water replenishment pump, and a water replenishment solenoid valve in sequence. The anode separator is equipped with a high liquid level sensor, a medium liquid level sensor, and a low liquid level sensor.

6. An electrolytic cell testing device according to claim 1, characterized in that, The top of the anode separator is connected to an anode exhaust pipe, which is equipped with an anode back pressure valve. The anode separator is also equipped with an anode pressure sensor.

7. An electrolytic cell testing device according to claim 1, characterized in that, It also includes a cathode separator, with a cathode exhaust pipe connected to the top of the cathode separator and a cathode back pressure valve installed on the cathode exhaust pipe. The cathode drain pipe is connected to the bottom of the cathode separator and is connected to the wastewater tank.

8. An electrolytic cell testing device according to claim 7, characterized in that, The anode drain line is connected to the wastewater tank via the wastewater recovery line, and the cathode drain line is connected to the wastewater recovery line.

9. An electrolytic cell testing device according to claim 1, characterized in that, The cathode separator is equipped with a cathode pressure sensor.

10. An electrolytic cell testing device according to claim 1, characterized in that, The cathode separator is equipped with a high liquid level sensor, a medium liquid level sensor, and a low liquid level sensor from bottom to top.

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