Bipolar membrane steady state experiment device and bipolar membrane steady state experiment control method

Abstract

The invention discloses a bipolar membrane steady-state experiment device and a bipolar membrane steady-state experiment control method, and relates to the technical field of bipolar membrane experiments.The bipolar membrane steady-state experiment device comprises a salt tank, an acid tank, an alkali tank and a membrane stack unit, and the salt tank, the acid tank and the alkali tank are circularly communicated with a salt chamber, an acid chamber and an alkali chamber of the membrane stack unit respectively; the salt tank, the acid tank and the alkali tank are all provided with concentration detection mechanisms, the salt tank is communicated with a salt water supply pipeline for supplying saturated salt water, the acid tank is communicated with a first pure water supply pipeline for supplying pure water, and the alkali tank is communicated with a second pure water supply pipeline for supplying pure water; the saline water supply pipeline, the first pure water supply pipeline and the second pure water supply pipeline are respectively provided with a delivery pump for adjusting flow; according to the invention, the solution is detected through the concentration detection mechanism, and the flow of the delivery pump is adjusted, so that the purpose of actively regulating and controlling the solution concentration to increase or decrease is achieved, the solution concentration in the experiment process is maintained at a steady state, and the accuracy and repeatability of the experiment result are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of bipolar membrane experimental technology, and particularly relates to a bipolar membrane steady-state experimental device and a control method for bipolar membrane steady-state experiments. Background Art

[0002] Bipolar membrane technology, as a cutting-edge membrane separation technology, has received extensive attention and research in recent years. Its unique ability to produce acid and alkali makes it have great application potential in many fields such as chemical separation, water resource treatment, and energy conversion. In traditional bipolar membrane experiments, batch experimental methods are often used. Experimental personnel will pre-configure a certain concentration of salt solution and place it in the salt solution tank of the experimental device, add a certain amount of pure water to the acid solution tank and the alkali solution tank as the receiving liquid for acid and alkali. The salt solution tank is connected to the salt chamber of the membrane stack unit, the acid solution tank is connected to the acid chamber of the membrane stack unit, and the alkali solution tank is connected to the alkali chamber of the membrane stack unit. Subsequently, through the electrolysis of the bipolar membrane in the membrane stack unit, the ions in the salt solution are converted into acid and alkali. For example, in a system with sodium chloride as the salt solution, sodium chloride can be converted into hydrochloric acid and sodium hydroxide. As the reaction progresses, the concentration of salt in the salt solution tank gradually decreases, while the acid concentration in the acid solution tank and the alkali concentration in the alkali solution tank gradually increase.

[0003] During the experiment, as the reaction progresses, the salt concentration, acid concentration, and alkali concentration are gradually changing. The dynamic change of the concentration causes the experimental environment to be unable to maintain a steady state. This non-steady experimental condition brings great difficulties to the acquisition and analysis of data. For example, the output of voltage and current will fluctuate with the change of concentration, which seriously affects the accuracy and repeatability of the experimental results.

[0004] Therefore, there is an urgent need for a bipolar membrane steady-state experimental device with high experimental result accuracy and high repeatability. Summary of the Invention

[0005] The purpose of the present invention is to provide a bipolar membrane steady-state experimental device and a control method for bipolar membrane steady-state experiments to solve the problems existing in the above-mentioned prior art. By actively regulating the solution concentration in the salt tank, acid tank, and alkali tank according to the detection data of the concentration detection mechanism, the solution concentration is maintained in a steady state during the experiment, improving the accuracy and repeatability of the experimental results.

[0006] To achieve the above object, the present invention provides the following solution: The present invention provides a bipolar membrane steady-state experimental device, including a salt tank, an acid tank, an alkali tank and a membrane stack unit. The salt tank, the acid tank and the alkali tank are respectively and circularly communicated with the salt chamber, the acid chamber and the alkali chamber of the membrane stack unit through a circulation pump and a circulation pipeline. Concentration detection mechanisms for detecting the concentration of the solution in the tank are provided at the salt tank, the acid tank and the alkali tank. The salt tank is communicated with a brine supply pipeline for supplying saturated brine, the acid tank is communicated with a first pure water supply pipeline for supplying pure water, and the alkali tank is communicated with a second pure water supply pipeline for supplying pure water. Delivery pumps for adjusting the flow rate are provided on the brine supply pipeline, the first pure water supply pipeline and the second pure water supply pipeline.

[0007] Preferably, the concentration detection mechanism is electrically connected to a control unit, and the control unit is electrically connected to the delivery pump through a driver.

[0008] Preferably, the bipolar membrane steady-state experimental device further includes a heater and a cooler for heating or cooling the solution in each tank. Temperature sensors are provided in the salt tank, the acid tank and the alkali tank. The temperature sensors, the cooler and the heater are all electrically connected to the control unit.

[0009] Preferably, the cooler and the heater are thermoelectric coolers.

[0010] Preferably, the temperature sensors are arranged in the middle of the inner walls of the salt tank, the acid tank and the alkali tank.

[0011] Preferably, the concentration detection mechanism includes a solid block and a sensor for measuring the weight of the solid block. The solid block is rigidly connected to the sensor, the solid block is located directly below the sensor, the solid block is located in the salt tank, the acid tank or the alkali tank, and the horizontal height of the top of the solid block is not higher than the horizontal height of the solution liquid level. The sensor is electrically connected to the control unit.

[0012] Preferably, the delivery pump is a peristaltic pump.

[0013] Preferably, overflow ports are provided on the side walls of the salt tank, the acid tank and the alkali tank, and collection devices for receiving the overflow solution are provided below the overflow ports.

[0014] The present invention also provides a bipolar membrane steady-state experimental control method using the above bipolar membrane steady-state experimental device, including the following steps: S1: Set the target concentration values and target temperature values in the salt tank, the acid tank and the alkali tank, and start the bipolar membrane electrodialysis experiment; S2: During the experiment, the sensor detects the weight of the solid block in real time. The control unit obtains the real-time concentration value of the solution in the tank based on the weight of the solid block, and adjusts the delivery flow rate of the delivery pump according to the difference between the real-time concentration value and the target concentration value. When the real-time concentration value in the salt tank is lower than the target concentration value, the flow rate is increased to raise the concentration; when the real-time concentration value is higher than the target concentration value, the flow rate is decreased to lower the concentration, actively controlling the solution concentration. When the real-time concentration value in the acid tank and the alkali tank is lower than the target concentration value, the flow rate is decreased to raise the concentration; when the real-time concentration value is higher than the target concentration value, the flow rate is increased to lower the concentration, actively controlling the solution concentration; S3: During the experiment, the control unit obtains the real-time temperature value of the solution through the temperature sensor, and adjusts whether the thermoelectric cooler heats or cools the circulation pipeline according to the difference between the real-time temperature value and the target temperature value. When the real-time temperature value is lower than the target temperature value, the thermoelectric cooler heats the circulation pipeline; when the real-time temperature value is higher than the target temperature value, the thermoelectric cooler cools the circulation pipeline, actively controlling the solution temperature.

[0015] Preferably, during the experiment, the control unit records the voltage and current changes of the membrane stack unit in real time.

[0016] The present invention mainly achieves the following technical effects compared with the prior art: During the bipolar membrane electrodialysis experiment, due to the circulating flow of the solution between each tank and each compartment of the membrane stack unit, the solution concentrations in the salt tank, acid tank, and alkali tank represent the solution concentrations in the salt chamber, acid chamber, and alkali chamber respectively. At this time, the solution in the salt tank, acid tank, and alkali tank is detected by the concentration detection mechanism, and less or more solution is delivered into the salt tank, acid tank, and alkali tank through the delivery pump to achieve the purpose of actively regulating the increase or decrease of the solution concentration, so that the solution concentration is maintained in a steady state during the experiment, improving the accuracy and repeatability of the experimental results.

[0017] Other solutions of the present invention achieve the following technical effects compared with the prior art: By the control unit receiving the concentration information and controlling the delivery pump, the automation degree of the device is improved.

[0018] Through the cooperation of the temperature sensor, cooler, and heater, the control of the solution temperature can be realized, so that the temperature is maintained in a steady state, further improving the accuracy and repeatability of the experimental results.

[0019] The solution overflowing from the overflow port can be collected and used as surplus raw materials or products for evaluation and analysis, avoiding waste of resources. Description of the Drawings

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0021] Figure 1 It is a system diagram of the bipolar membrane steady-state experimental device in the embodiment of the present invention; Among them, 1. Salt tank; 2. Acid tank; 3. Alkali tank; 4. Delivery pump; 5. Driver; 6. Sensor; 7. Temperature sensor; 8. Thermoelectric cooler; 9. Control unit; 10. Membrane stack unit; 11. Solid block; 12. Overflow port. Specific embodiments

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0023] The purpose of the present invention is to provide a bipolar membrane steady-state experimental device and a bipolar membrane steady-state experimental control method to solve the problems existing in the prior art. By using the detection data of the concentration detection mechanism to cooperate with adjusting the flow rate of the delivery pump to actively control the solution concentration in the salt tank, acid tank, and alkali tank, the solution concentration is maintained in a steady state during the experiment, improving the accuracy and repeatability of the experimental results.

[0024] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0025] Please refer to as Figure 1As shown in the figure, a bipolar membrane steady-state experimental device is provided, including a salt tank 1, an acid tank 2, a base tank 3, and a membrane stack unit 10. The salt tank 1, the acid tank 2, and the base tank 3 are respectively connected to the salt chamber, the acid chamber, and the base chamber of the membrane stack unit 10 through a circulation pump and a circulation pipeline. Specifically: The circulation pipeline includes an inlet pipe and an outlet pipe. The outlet of the tank body is connected to the inlet of the compartment through the inlet pipe, and the inlet of the tank body is connected to the outlet of the compartment through the outlet pipe. The circulation pump is arranged on the inlet pipe or the outlet pipe, and the work of the circulation pump drives the solution to circulate between the tank body and the compartment; Concentration detection mechanisms for detecting the concentration of the solution in the tank body are arranged at the salt tank 1, the acid tank 2, and the base tank 3. The salt tank 1 is connected to a brine supply pipeline for supplying saturated brine, the acid tank 2 is connected to a first pure water supply pipeline for supplying pure water, and the base tank 3 is connected to a second pure water supply pipeline for supplying pure water. Delivery pumps 4 for regulating the flow rate are arranged on the brine supply pipeline, the first pure water supply pipeline, and the second pure water supply pipeline. The working principle of this device is: During the bipolar membrane electrodialysis experiment, due to the circulation of the solution between each tank body and each compartment of the membrane stack unit 10, the solution concentrations in the salt tank 1, the acid tank 2, and the base tank 3 represent the solution concentrations in the salt chamber, the acid chamber, and the base chamber respectively. At this time, the solution in the salt tank 1, the acid tank 2, and the base tank 3 is detected by the concentration detection mechanism, and less or more solution is transported into the salt tank 1, the acid tank 2, and the base tank 3 through the delivery pump 4 to achieve the purpose of actively regulating the increase or decrease of the solution concentration, so that the solution concentration is maintained at a steady state during the experiment, improving the accuracy and repeatability of the experimental results.

[0026] The concentration detection mechanism is electrically connected to the control unit 9, and the control unit 9 is electrically connected to the delivery pump 4 through the driver 5. By receiving the concentration information through the control unit 9 and controlling the delivery pump 4, the automation degree of the device is improved, the complexity and error rate of manual operation are reduced, and the experimental efficiency and quality are improved.

[0027] This device also includes a heater and a cooler for heating or cooling the solution in each tank body. Each solution can be independently heated and cooled by the heater and the cooler. Temperature sensors 7 are arranged in the salt tank 1, the acid tank 2, and the base tank 3. The temperature sensors 7, the cooler, and the heater are all electrically connected to the control unit 9. When the temperature sensor 7 detects that the temperature of a certain solution is lower than the set temperature, the control unit 9 controls the heater to start heating the solution. When the temperature sensor 7 detects that the temperature of a certain solution is higher than the set temperature, the control unit 9 controls the cooler to start cooling the solution; Through the cooperation of the temperature sensor 7, the cooler, and the heater, the control of the solution temperature can be realized, so that the temperature is maintained at a steady state, further improving the accuracy and repeatability of the experimental results.

[0028] In this embodiment, the circulation pipeline of the salt tank 1, the circulation pipeline of the acid tank 2 and the circulation pipeline of the alkali tank 3 are all provided with a refrigerator and a heater; in other embodiments, the heater and the refrigerator can be arranged on the periphery of the tank body to exchange heat with the heat-conducting tank body to achieve heating or cooling of the solution.

[0029] The refrigerator and heater used in this embodiment are semiconductor refrigeration sheets 8 that can take into account both heating and cooling functions. The control unit 9 can change the current direction of the semiconductor refrigeration sheet 8 to change whether the side of the semiconductor refrigeration sheet 8 close to the circulation pipeline is heating or cooling. Specifically, the entire circulation pipeline or a certain section can be directly set as a pipe section with heat exchange capacity, and the semiconductor refrigeration sheet 8 can be set corresponding to the pipe section with heat exchange capacity. At this time, the semiconductor refrigeration sheet 8 can be set to be cylindrical and surrounded by the outer periphery of the pipe section with heat exchange capacity; in other embodiments, conventional electric heating belts and coil-type cooling water circulation systems can also be used as heaters and refrigerators to heat and cool the solution in the circulation pipeline.

[0030] In this embodiment, the temperature sensor 7 is arranged in the middle of the inner wall of the salt tank 1, the acid tank 2 and the alkali tank 3 to improve the accuracy of the detection data.

[0031] In this embodiment, the concentration detection mechanism includes a solid block 11 and a sensor 6 for measuring the weight of the solid block 11. The sensor 6 can be a weighing sensor or a tension sensor. The solid block 11 is rigidly connected to the sensor 6. Specifically, the solid block 11 is fixedly connected to the force-bearing end of the sensor 6 through a connecting rod. The force-bearing end refers to the end of the sensor 6 that receives external force. The solid block 11 is located directly below the sensor 6. The solid block 11 is located in the salt tank 1, the acid tank 2 or the alkali tank 3. The top level of the solid block 11 is not higher than the level of the solution surface. The sensor 6 is electrically connected to the control unit 9. The solid block 11 can be set to a sphere or other shapes. The concentration detection principle in this embodiment is: (actual mass of the solid block 11-mass of the solid block 11 when immersed in the solution) / volume of the solid block 11=solution density. The measured solution density is then matched with the solution concentration to obtain the solution concentration. In other embodiments, other devices that can realize concentration detection can also be used as concentration detection mechanisms, which can be selected specifically according to the solution composition during the actual experiment.

[0032] In this embodiment, the delivery pump 4 can be a peristaltic pump to achieve precise control of the flow rate. In other embodiments, other types of pump bodies can also be selected to achieve regulation of the flow rate.

[0033] Overflow ports 12 are provided on the side walls of the salt tank 1, the acid tank 2, and the alkali tank 3. A collecting device for receiving the overflow solution is provided below the overflow port 12. The collecting device can be a collecting cup or a collecting cylinder, etc. In this way, during the experiment, when the liquid level of the solution reaches the overflow port 12, it will overflow from the overflow port 12. The solution overflowing from the overflow port 12 can be collected as surplus raw materials or products for evaluation and analysis, thereby evaluating the acid and alkali production performance of the bipolar membrane and avoiding waste of resources.

[0034] The present invention also provides a bipolar membrane steady-state experiment control method using the above bipolar membrane steady-state experiment device, including the following steps: S1: Set the target concentration values and target temperature values in the salt tank 1, the acid tank 2, and the alkali tank 3, and start the bipolar membrane electrodialysis experiment; S2: During the experiment, the sensor 6 detects the weight of the solid block 11 in real time. The control unit 9 obtains the real-time concentration value of the solution in the tank according to the weight of the solid block 11, and adjusts the delivery flow rate of the delivery pump 4 according to the difference between the real-time concentration value and the target concentration value. When the real-time concentration value in the salt tank 1 is lower than the target concentration value, increase the flow rate to increase the concentration. When the real-time concentration value is higher than the target concentration value, decrease the flow rate to decrease the concentration, actively controlling the solution concentration. When the real-time concentration values in the acid tank 2 and the alkali tank 3 are lower than the target concentration values, decrease the flow rate to increase the concentration. When the real-time concentration values are higher than the target concentration values, increase the flow rate to decrease the concentration, actively controlling the solution concentration; S3: During the experiment, the control unit 9 obtains the real-time temperature value of the solution through the temperature sensor 7, and adjusts whether the thermoelectric cooler 8 heats or cools the circulation pipeline according to the difference between the real-time temperature value and the target temperature value. When the real-time temperature value is lower than the target temperature value, the thermoelectric cooler 8 heats the circulation pipeline. When the real-time temperature value is higher than the target temperature value, the thermoelectric cooler 8 cools the circulation pipeline, actively controlling the solution temperature. The power of the thermoelectric cooler 8 is proportional to the temperature difference.

[0035] During the experiment, the control unit 9 records key parameter situations such as the voltage and current changes of the membrane stack unit 10 in real time. After the experiment, the operator can obtain a complete experimental data report through the control unit 9 for subsequent data analysis and processing.

[0036] Actual experimental example: Set the sodium chloride brine concentration in the salt tank 1 to be controlled at 5%, the hydrochloric acid concentration in the acid tank 2 to be controlled at 2 mol / L, the sodium hydroxide concentration in the alkali tank 3 to be controlled at 2 mol / L, and the temperature to be 25 °C. Under these conditions, test the acid and alkali production ability and energy consumption of the bipolar membrane.

[0037] Add 10% sodium chloride brine to the salt tank 1, and add pure water to the acid tank 2 and the alkali tank 3. Start the membrane stack unit 10, the driver 5, the sensor 6, the temperature sensor 7, the semiconductor refrigeration sheet 8, and the control unit 9.

[0038] The solutions in the salt tank 1, the acid tank 2, and the alkali tank 3 are circulated in each compartment of the membrane stack unit 10 respectively. Under the action of the electric field, the sodium chloride brine is converted into sodium hydroxide and hydrochloric acid. Due to the experimental conditions requiring the concentration of sodium chloride brine in the salt tank 1 to be controlled at 5%, the concentration of hydrochloric acid in the acid tank 2 to be controlled at 2 mol / L, and the concentration of sodium hydroxide in the alkali tank 3 to be controlled at 2 mol / L, therefore, at the initial stage of the experiment, under the action of the control unit 9, the delivery pump 4 corresponding to the salt tank 1 is in a stopped state.

[0039] As the membrane stack unit 10 continuously operates, the sodium chloride in the salt tank 1 is continuously consumed and the concentration continuously decreases. Until the concentration drops from 10% to below 5%, the delivery pump 4 corresponding to the salt tank 1 starts to work to replenish 20% sodium chloride brine into the salt tank 1. Under the adjustment of the control unit 9, the rotation speed of the delivery pump 4 ensures that the amount of salt pumped into the salt tank 1 is equal to the amount of salt consumed by the membrane stack unit 10, so that the sodium chloride concentration of the solution entering the salt chamber of the membrane stack unit 10 is always maintained at 5%. At the same time, 5% brine continuously flows out from the overflow port 12 of the alkali tank 3.

[0040] Similarly, as the membrane stack unit 10 continuously operates, the concentrations of sodium hydroxide and hydrochloric acid in the alkali tank 3 and the acid tank 2 continuously increase. Until the concentrations of the alkali and the acid are respectively higher than 2 mol / L, the delivery pumps 4 corresponding to the alkali tank 3 and the acid tank 2 start to work to replenish pure water into the alkali tank 3 and the acid tank 2 respectively. Under the adjustment of the control unit 9, the rotation speed of the delivery pump 4 ensures that the amount of alkali and acid produced by the membrane stack unit 10 and the amount of pure water replenished are maintained in a certain proportion, so that the solution circulating between the alkali tank 3 and the alkali chamber of the membrane stack unit 10 is always a 2 mol / L sodium hydroxide solution, and a 2 mol / L sodium hydroxide solution product stably overflows from the overflow port 12 of the alkali tank 3; the solution circulating between the acid tank 2 and the acid chamber of the membrane stack unit 10 is always a 2 mol / L hydrochloric acid solution, and a 2 mol / L hydrochloric acid solution product stably overflows from the overflow port 12 of the acid tank 2.

[0041] During the whole experiment process, the control unit 9 will continuously monitor the temperature and dynamically adjust the working state of the semiconductor refrigeration sheet 8 according to the actual situation, which includes adjusting the heating or cooling power, starting or stopping heating / cooling, etc., so that the temperature is maintained at 25 degrees.

[0042] After the temperature and the rotational speeds of each transfer pump 4 have been kept constant, collect 2 mol / L sodium hydroxide and 2 mol / L hydrochloric acid flowing out from the overflow ports 12 of the alkali tank 3 and the acid tank 2 respectively. Within 1 h, the volume of collected sodium hydroxide is 1.5 L, and the volume of collected 2 mol / L hydrochloric acid is 1.6 L. Through calculation, it is obtained that under the experimental conditions of this time, this bipolar membrane produces 3 mol of sodium hydroxide and 3.2 mol of hydrochloric acid within 1 h.

[0043] Adaptations made according to actual requirements are all within the protection scope of the present invention.

[0044] It should be noted that for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0045] Specific examples are used in the present invention to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A bipolar membrane steady-state experimental device, characterized in that, It includes a salt tank, an acid tank, an alkali tank and a membrane stack unit. The salt tank, the acid tank and the alkali tank are respectively and circularly communicated with the salt chamber, the acid chamber and the alkali chamber of the membrane stack unit through a circulation pump and a circulation pipeline. Concentration detection mechanisms for detecting the concentration of the solution in the tank are provided at the salt tank, the acid tank and the alkali tank. The salt tank is communicated with a brine supply pipeline for supplying saturated brine. The acid tank is communicated with a first pure water supply pipeline for supplying pure water. The alkali tank is communicated with a second pure water supply pipeline for supplying pure water. Delivery pumps for regulating the flow rate are provided on the brine supply pipeline, the first pure water supply pipeline and the second pure water supply pipeline.

2. The bipolar membrane steady-state experimental device according to claim 1, wherein, The concentration detection mechanism is electrically connected to a control unit, and the control unit is electrically connected to the delivery pump through a driver.

3. The bipolar membrane steady-state experimental device according to claim 2, characterized in that, The bipolar membrane steady-state experimental device further includes a heater and a cooler for heating or cooling the solution in each tank. Temperature sensors are provided in the salt tank, the acid tank and the alkali tank. The temperature sensors, the cooler and the heater are all electrically connected to the control unit.

4. The bipolar membrane steady-state experimental device according to claim 3, characterized in that, The cooler and the heater are thermoelectric coolers.

5. The bipolar membrane steady-state experimental device according to claim 3, wherein The temperature sensors are arranged in the middle of the inner walls of the salt tank, the acid tank and the alkali tank.

6. The bipolar membrane steady-state experimental device according to claim 2, wherein The concentration detection mechanism includes a solid block and a sensor for measuring the weight of the solid block. The solid block is rigidly connected to the sensor. The solid block is located directly below the sensor. The solid block is located in the salt tank, the acid tank or the alkali tank. The horizontal height of the top of the solid block is not higher than the horizontal height of the solution liquid level. The sensor is electrically connected to the control unit.

7. The bipolar membrane steady-state experimental device according to claim 1, characterized in that, The delivery pump is a peristaltic pump.

8. The bipolar membrane steady-state experimental device according to claim 1, characterized in that, Overflow ports are provided on the side walls of the salt tank, the acid tank and the alkali tank, and a collection device for receiving the overflow solution is provided below the overflow ports.

9. A bipolar membrane steady-state experiment control method, characterized in that Applying the bipolar membrane steady-state experimental device as claimed in claim 6 includes the following steps: S1: Set the target concentration value and the target temperature value in the salt tank, the acid tank and the alkali tank, and start the bipolar membrane electrodialysis experiment. S2: During the experiment, the sensor detects the weight of the solid block in real time. The control unit obtains the real-time concentration value of the solution in the tank according to the weight of the solid block, and adjusts the delivery flow rate of the delivery pump according to the difference between the real-time concentration value and the target concentration value. When the real-time concentration value in the salt tank is lower than the target concentration value, increase the flow rate to increase the concentration. When the real-time concentration value is higher than the target concentration value, decrease the flow rate to decrease the concentration, and actively control the solution concentration. When the real-time concentration value in the acid tank and the alkali tank is lower than the target concentration value, decrease the flow rate to increase the concentration. When the real-time concentration value is higher than the target concentration value, increase the flow rate to decrease the concentration, and actively control the solution concentration. S3: During the experiment, the control unit obtains the real-time temperature value of the solution through the temperature sensor, and adjusts whether the thermoelectric cooler heats or cools the circulation pipeline according to the difference between the real-time temperature value and the target temperature value. When the real-time temperature value is lower than the target temperature value, the thermoelectric cooler heats the circulation pipeline. When the real-time temperature value is higher than the target temperature value, the thermoelectric cooler cools the circulation pipeline, and actively controls the solution temperature.

10. The bipolar membrane steady-state experiment control method according to claim 9, wherein During the experiment, the control unit records the voltage and current changes of the membrane stack unit in real time.

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