A method for reducing energy consumption of electrolytic cell

Abstract

The present invention discloses a method for reducing energy consumption of an electrolytic cell, and relates to the technical field of hydrogen preparation. The electrolytic cell comprises an anode reaction part, a cathode reaction part and a diaphragm. The anode reaction part and the cathode reaction part are arranged relatively to each other, and an anode flow channel groove and a cathode flow channel groove are respectively opened on opposite sides thereof. The diaphragm is located between the anode flow channel groove and the cathode flow channel groove; both ends of the anode flow channel groove and the cathode flow channel groove are respectively connected to a liquid storage tank through a circulation pipe; the electrolyte flow rate of the anode flow channel groove is greater than the electrolyte flow rate of the cathode flow channel groove. The present invention balances the pressure difference between the anode reaction part and the cathode reaction part by setting the electrolyte flow rate of the anode flow channel groove greater than the electrolyte flow rate of the cathode flow channel groove, thereby reducing the turbulence of the electrolyte flow and improving the efficiency of the electrolytic cell.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen preparation, and more particularly to a method for reducing energy consumption of an electrolytic cell. Background Art

[0002] As the global demand for clean energy continues to grow, hydrogen energy, as an efficient and clean energy carrier, has received widespread attention. Hydrogen production by water electrolysis is an important method of hydrogen production, among which alkaline electrolyzers have been widely used in industry due to their low cost and mature technology.

[0003] In alkaline electrolyzers, the flow rate of the electrolyte has a significant impact on the efficiency of hydrogen production by water electrolysis. At present, there has been no in-depth research and clear understanding of the relationship between the flow rate of the electrolyte and the efficiency of hydrogen production by water electrolysis. There is even a lack of systematic analysis of the situation of different flow rates of the anode and cathode.

[0004] On the one hand, when the flow rates of the cathode and anode electrolytes are different, different effects may be produced on the reactions on the electrode surfaces. For example, appropriately increasing the flow rate of the anode electrolyte can enhance the oxidation reaction rate of the anode and promote the production of oxygen; while appropriately adjusting the cathode electrolyte flow rate can optimize the generation rate of hydrogen. At the same time, the combination of different flow rates can also better control the generation and detachment of bubbles on the electrode surface, reduce the coverage of bubbles on the electrode, and improve the electrolysis efficiency.

[0005] On the other hand, if the flow rate difference between the cathode and anode is too large, it may cause pressure imbalance inside the electrolytic cell, affecting the stability of the electrolytic cell. In addition, an inappropriate flow rate combination may increase the flow resistance of the electrolyte, increase energy consumption, and even cause erosion of the electrodes, affecting the stability and life of the electrodes.

[0006] Therefore, how to provide a new method and device for detecting the influence of electrolyte flow rate on water electrolysis efficiency, by gradually adjusting the electrolyte flow rate and the current size of the anode and cathode, and more systematically analyzing the relationship between the electrolyte flow rate and the hydrogen production efficiency of water electrolysis is a problem that technicians in this field urgently need to solve. Summary of the invention

[0007] In view of this, the present invention provides a method for reducing energy consumption of an electrolyzer, aiming to solve the technical problem of the lack of variable analysis of electrolyte flow rate in the above-mentioned traditional water electrolysis hydrogen production efficiency analysis device.

[0008] The present invention provides a method for reducing energy consumption of an electrolytic cell. The electrolytic cell comprises an anode reaction part, a cathode reaction part and a diaphragm. The anode reaction part and the cathode reaction part are arranged relatively to each other and an anode flow channel groove and a cathode flow channel groove are respectively opened on opposite sides thereof. The diaphragm is located between the anode flow channel groove and the cathode flow channel groove. Both ends of the anode flow channel groove and the cathode flow channel groove are respectively connected to a liquid storage tank through a circulation pipe. The electrolyte flow rate of the anode flow channel groove is greater than the electrolyte flow rate of the cathode flow channel groove.

[0009] Through the above technical scheme, the present invention balances the pressure difference between the anode reaction part and the cathode reaction part by setting the electrolyte flow rate in the anode flow channel groove to be greater than the electrolyte flow rate in the cathode flow channel groove, thereby reducing the turbulence of the electrolyte flow and improving the efficiency of the electrolytic cell.

[0010] Preferably, the electrolyte flow rate of the anode flow channel is in the range of 40-150 mL / min; the electrolyte flow rate of the cathode flow channel is in the range of 7-40 mL / min.

[0011] Preferably, the difference between the electrolyte flow rate of the anode flow channel and the electrolyte flow rate of the cathode flow channel is greater than 30 mL / min.

[0012] Preferably, the electrolyte flow rate of the anode flow channel is 150 mL / min, and the electrolyte flow rate of the cathode flow channel is 7 mL / min.

[0013] Preferably, both ends of the anode flow channel are connected to the liquid storage tank through a first circulation pipeline, and both ends of the cathode flow channel are connected to the liquid storage tank through a second circulation pipeline. Peristaltic pumps are connected to the pipes of the first circulation pipeline and the second circulation pipeline near the inlet end of the anode flow channel.

[0014] Preferably, the anode reaction part includes an anode plate, an anode electrode plate, an anode liquid inlet joint, an anode liquid outlet joint and an anode ear. An S-shaped flow channel groove 1 is provided on the first plate surface of the anode plate. The anode electrode plate contacts and cooperates with the first plate surface of the anode plate and its plate surface covers the S-shaped flow channel groove 1. An anode liquid inlet hole and an anode liquid outlet hole are respectively provided at both ends of the anode plate located at the S-shaped flow channel groove 1. The anode liquid inlet joint and the anode liquid outlet joint are located on the second plate surface of the anode plate. The anode liquid inlet joint is tightly connected to the anode liquid inlet hole, and the anode liquid outlet joint is tightly connected to the anode liquid outlet hole. One end of the anode ear contacts and abuts the anode electrode plate, and the other end passes through the anode plate and is located on the second plate surface of the anode plate. The positive pole of the power supply is electrically connected to the anode ear.

[0015] Preferably, the cathode reaction part includes a cathode plate, a cathode electrode plate, a cathode liquid inlet joint, a cathode liquid outlet joint and a cathode ear. The first plate surface of the cathode plate is provided with an S-shaped flow channel groove II, and is arranged opposite to the first plate surface of the anode plate. The cathode electrode plate is in contact with and cooperates with the first plate surface of the cathode plate and its plate surface covers the S-shaped flow channel groove II. The cathode plate is provided with a cathode liquid inlet hole and a cathode liquid outlet hole at both ends of the S-shaped flow channel groove II, respectively. The cathode liquid inlet joint and the cathode liquid outlet joint are located on the second plate surface of the anode plate. The cathode liquid inlet joint is tightly connected to the cathode liquid inlet hole, and the cathode liquid outlet joint is tightly connected to the cathode liquid outlet hole. One end of the cathode ear is in contact with and abuts the cathode electrode plate, and the other end passes through the cathode plate and is located on the second plate surface of the cathode plate. The negative pole of the power supply is electrically connected to the cathode ear.

[0016] Preferably, it also includes a sealing plate, a flow port is opened in the middle position of the sealing plate, there are two sealing plates, which are symmetrically distributed on both sides of the diaphragm and are in contact with the diaphragm, the two sealing plates are located between the anode electrode plate and the cathode electrode plate, and the two ends of the flow port are arranged opposite to the anode electrode plate and the cathode electrode plate respectively.

[0017] Preferably, the cathode plate and the anode plate are fastened by bolts and nuts.

[0018] Preferably, a heating platform is further included, which is used to heat the electrolyte in the anode collecting tank and the cathode collecting tank; gas collection ports are opened at the top of the anode collecting tank and the cathode collecting tank to collect the gas generated by the anode reaction part and the cathode reaction part.

[0019] The electrolyte flow rate of the anode flow channel of the present invention is greater than the electrolyte flow rate of the cathode flow channel. From the performance point of view, this flow rate difference can optimize the electrolysis process. The higher flow rate at the anode can quickly take away the reaction generated gas, reduce the adhesion and aggregation of bubbles on the electrode surface, reduce the resistance between the electrode and the electrolyte, and avoid additional energy consumption; the appropriate cathode flow rate satisfies the material transfer without disturbing the reaction environment. The combination of the two improves the performance of the electrolyzer and reduces energy consumption, just like creating an efficient logistics system for it; in terms of stability, the appropriate flow rate difference can balance the pressure difference between the anode and cathode, prevent electrolyte flow disorder, avoid local overheating, concentration fluctuations and other problems, and allow the electrolysis reaction to continue in a stable environment, just like providing a stable support for the electrolyzer. This discovery is conducive to providing an important theoretical basis for hydrogen production by electrolyzers. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A three-dimensional schematic diagram of a method for reducing energy consumption of an electrolytic cell provided by the present invention;

[0021] Figure 2 An exploded schematic diagram of an electrolytic cell provided by the present invention;

[0022] Figure 3A three-dimensional schematic diagram of an anode plate provided by the present invention;

[0023] Figure 4 A three-dimensional schematic diagram of a cathode plate provided by the present invention;

[0024] Figure 5 A three-dimensional schematic diagram of a sealing sheet is provided for the present invention;

[0025] Figure 6 It is a voltage-current density line graph in the embodiment;

[0026] Figure 7 It is a line graph of energy consumption-current density in the embodiment;

[0027] Figure 8 It is the voltage-current density line graph in Comparative Example 1;

[0028] Fig. 9 It is the energy consumption-current density line graph in Comparative Example 1;

[0029] Fig.10 It is the voltage-current density line graph in Comparative Example 2;

[0030] Fig.11 It is the energy consumption-current density line graph in Comparative Example 2;

[0031] Fig.12 This is the stability test diagram in Comparative Example 3.

[0032] Wherein: 1-electrolytic cell; 3-peristaltic pump; 4-power supply; 5-heating table; 11-anode reaction part; 12-cathode reaction part; 13-diaphragm; 14-bolt; 15-nut; 16-reference electrode; 17-sealing sheet; 21-anode storage tank; 22-cathode storage tank; 111-anode plate; 112-anode electrode plate; 113-anode liquid inlet connector; 114-anode liquid outlet connector; 115-anode ear; 121-cathode plate; 122-cathode electrode plate; 123-anode liquid inlet connector; 124-anode liquid outlet connector; 125-cathode ear; 1111-S-shaped flow channel groove one; 1112-anode liquid inlet hole; 1113-anode liquid outlet hole; 1211-S-shaped flow channel groove two; 1212-cathode liquid inlet hole; 1213-cathode liquid outlet hole. DETAILED DESCRIPTION

[0033] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0034] According to an embodiment of the present invention, a method for reducing energy consumption of an electrolytic cell is provided. The electrolytic cell includes an anode reaction part 11, a cathode reaction part 12 and a diaphragm 13. The anode reaction part 11 and the cathode reaction part 12 are arranged relative to each other and an anode flow channel groove and a cathode flow channel groove are respectively opened on opposite sides thereof. The diaphragm 13 is located between the anode flow channel groove and the cathode flow channel groove; both ends of the anode flow channel groove and the cathode flow channel groove are respectively connected to a liquid storage tank through a circulation pipe; the electrolyte flow rate of the anode flow channel groove is greater than the electrolyte flow rate of the cathode flow channel groove.

[0035] The experimental steps of the method for reducing the energy consumption of the electrolytic cell of the present invention include:

[0036] The energy consumption calculation formula for constructing an electrolytic cell is: W(d) = 2390U / 1000n

[0037] Where W(d) is the energy consumption of the electrolytic cell, U is the DC voltage of the electrolytic cell, and n (n is equal to the number of electrolytic cells).

[0038] The starting values ​​of the flow rates of the cathode electrolyte and the anode electrolyte are set to be consistent, the flow rate of the cathode electrolyte is unchanged, the flow rate of the anode electrolyte and the current density of the electrolytic cell 1 are gradually adjusted, the voltage U of the electrolytic cell 1 under each set of flow rate and current density is recorded, and the energy consumption of the electrolytic cell 1 is calculated and recorded by substituting it into the above formula;

[0039] The starting values ​​of the flow rates of the cathode electrolyte and the anode electrolyte are set to be consistent, the flow rate of the anode electrolyte is unchanged, the flow rate of the cathode electrolyte and the current density of the electrolytic cell 1 are gradually adjusted, the voltage U of the electrolytic cell 1 under each set of flow rate and current density is recorded, and the energy consumption of the electrolytic cell 1 is calculated and recorded by substituting it into the above formula;

[0040] Set the starting flow rates of the cathode electrolyte and the anode electrolyte to be consistent, gradually adjust the flow rates of the anode electrolyte and the anode electrolyte and the current density of the electrolytic cell 1, record the voltage U of the electrolytic cell 1 under each set of flow rate and current density, and substitute it into the above formula to calculate the energy consumption of the electrolytic cell 1 and record it.

[0041] Embodiment 1:

[0042] See attached Figure 6-7, the cathode electrolyte flow rate was controlled to 7mL / min, and the anode flow rate was adjusted in sequence (7, 20, 40, 60, 80, 100, 120, 150, 170, 180, 190mL / min). The voltage of electrolyzer 1 under each flow rate combination was tested by constant current method using a DC power supply at current densities of 400, 800, 1200, 1600, 2000, 2400, 2800, 3200, 3600, 4000, 4400, 4800, and 5000A / ㎡. When the cathode electrolyte flow rate was 7mL / min, as the anode flow rate increased to 150mL / min, the voltage and energy consumption of the electrolyzer gradually decreased. The results show that when the anode flow rate is higher than the cathode flow rate, the performance of the electrolyzer will be improved and the energy consumption will be reduced. This may be because the anode oxygen evolution reaction is the rate-controlling step of the entire water electrolysis. The process experiments show that: Therefore, increasing the anode flow rate can optimize the oxygen evolution reaction rate, control the generation and detachment of bubbles on the electrode surface, reduce the coverage of bubbles on the electrode, and thus improve the performance of the electrolyzer.

[0043] Comparative Example 1:

[0044] See attached Figure 8-9 When the anode flow rate was fixed at 7 mL / min, the cathode flow rate was adjusted in sequence (7, 20, 40, 60, 80, 100, 120, 150 mL / min), and the voltage of the electrolytic cell under each flow rate combination was tested using the same method at current densities of 400, 800, 1200, 1600, 2000, 2400, 2800, 3200, 3600, 4000, 4400, 4800, and 5000 A / ㎡. Figure 3 As shown in the figure, when the flow rate of the anolyte is 7mL / min, the voltage of the electrolyzer gradually decreases as the cathode flow rate increases to 40mL / min. When the cathode flow rate continues to increase to 150mL / min, the voltage of the electrolyzer gradually increases. The experiment shows that energy consumption also decreases first and then increases with the increase of flow rate. When the cathode flow rate is too high and the anode flow rate is too low, the cathode reaction rate is too fast, while the anode reaction rate is too slow, which will inhibit the entire electrolysis reaction rate. Therefore, the performance of the electrolyzer will be reduced.

[0045] At different current densities (400, 800, 1200, 1600, 2000, 2400, 2800, 3200, 3600, 4000, 4400, 4800, 5000A / ㎡), the voltage range is 1.62-2.33V, and the energy consumption range is 3.87-5.57kWh / m 3 .

[0046] Comparative Example 2:

[0047] See attached Figure 10-11The flow rates of the cathode and anode were kept the same, and the flow rates of the two electrodes were adjusted (7, 14, 21, 28, 35, 42 mL / min). The voltage of the electrolytic cell under each flow rate combination was tested using the same method at current densities of 400, 800, 1200, 1600, 2000, 2400, 2800, 3200, 3600, 4000, 4400, 4800, and 5000 A / ㎡. Figure 4 As shown in the figure, as the flow rates at both electrodes increase simultaneously, the voltage of the electrolyzer gradually decreases. When the flow rates are 35 and 42 mL / min, the voltage and energy consumption of the electrolyzer are almost the same. This experimental phenomenon shows that when the flow rates at both electrodes increase too much at the same time, the cathode reaction rate is very fast, but the anode reaction rate is very slow, which seriously inhibits the electrolysis reaction rate. Therefore, when the flow rate exceeds 35 mL / min, the performance of the electrolyzer remains almost unchanged.

[0048] See attached Fig.12 The present invention determines that the flow rate has a significant effect on the stability and energy consumption of the electrolytic cell, and further determines the optimal one, which can be selected at a cathode flow rate of 7 mL / min and an anode flow rate of 150 mL / min. The stability test was carried out at a voltage of 1.9 V (as shown by the black line). Under this flow rate combination, the electrolytic current density of the electrolytic cell after 10 hours is almost maintained at around 2000 A / ㎡, and the stability is good.

[0049] In contrast, when the cathode flow rate is 40 mL / min and the anode flow rate is 7 mL / min, the current density of the electrolytic cell 1 decreases rapidly with the extension of the electrolysis time at the same voltage (as shown by the red line). The present invention determines that the electrolyte flow rate of the anode flow channel is greater than the electrolyte flow rate of the cathode flow channel. The appropriate flow rate and flow rate difference can adjust the service life of the electrolytic cell 1 and reduce energy consumption.

[0050] See attached Figure 1-5 The anode reaction part 11 includes an anode plate 111, an anode electrode plate 112, an anode liquid inlet joint 113, an anode liquid outlet joint 114 and an anode pole ear 115. The first plate surface of the anode plate 111 is provided with an S-shaped flow channel groove 1111. The anode electrode plate 112 is in contact with the first plate surface of the anode plate 111 and its plate surface covers the S-shaped flow channel groove 1111. The anode plate 111 is provided with an anode liquid inlet hole 1112 and an anode outlet hole 1113 at both ends of the S-shaped flow channel groove 1111. The liquid outlet 1113, the anode liquid inlet connector 113 and the anode liquid outlet connector 114 are located on the second plate surface of the anode plate 111, the anode liquid inlet connector 113 is tightly connected to the anode liquid inlet 1112, the anode liquid outlet connector 114 is tightly connected to the anode liquid outlet 1113, one end of the anode ear 115 is in contact with the anode electrode plate 112, and the other end passes through the anode plate 111 and is located on the second plate surface of the anode plate 111, and the positive pole of the power supply 4 is electrically connected to the anode ear 115.

[0051] Specifically, the S-shaped flow channel groove 1111 is the anode flow channel groove;

[0052] In some embodiments, the cathode reaction part 12 includes a cathode plate 121, a cathode electrode plate 122, a cathode liquid inlet joint 123, a cathode liquid outlet joint 124 and a cathode pole ear 125. The first plate surface of the cathode plate 121 is provided with an S-shaped flow channel groove 1211, and is arranged opposite to the first plate surface of the anode plate 111. The cathode electrode plate 122 is in contact with the first plate surface of the cathode plate 121 and its plate surface covers the S-shaped flow channel groove 1211. The cathode plate 121 is provided with two S-shaped flow channel grooves 1211 at both ends. The cathode liquid inlet hole 1212 and the cathode liquid outlet hole 1213, the cathode liquid inlet joint 123 and the cathode liquid outlet joint 124 are located on the second plate surface of the anode plate 111, the cathode liquid inlet joint 123 is tightly connected to the cathode liquid inlet hole 1212, the cathode liquid outlet joint 124 is tightly connected to the cathode liquid outlet hole 1213, one end of the cathode pole ear 125 is in contact with the cathode electrode plate 122, and the other end passes through the cathode plate 121 and is located on the second plate surface of the cathode plate 121, and the negative pole of the power supply 4 is electrically connected to the cathode pole ear 125.

[0053] Specifically, the second S-shaped flow channel 1211 is a cathode flow channel; the first S-shaped flow channel and the second S-shaped flow channel can increase the contact area between the electrolyte and the electrode plate as much as possible while controlling the flow rate of the electrolyte.

[0054] More specifically, the S-shaped flow channel groove 1 1111 and the S-shaped flow channel groove 2 1211 can be divided into three small flow channel grooves by the partition along the direction from the inlet to the outlet.

[0055] In some embodiments, the electrolytic cell may further include a sealing sheet 17, a flow port 171 is provided in the middle of the sealing sheet 17, there are two sealing sheets 17, which are symmetrically distributed on both sides of the diaphragm 13 and contact and cooperate with the diaphragm 13, the two sealing sheets 17 are located between the anode electrode plate 112 and the cathode electrode plate 122, and the two ends of the flow port 171 are arranged opposite to the anode electrode plate 112 and the cathode electrode plate 122. Specifically, the cathode plate 121 and the anode plate 111 are locked by bolts 14 and nuts 15.

[0056] Specifically, the cathode electrode plate 122 and the anode electrode plate 112 are provided with notches for performing ion exchange on the S-shaped flow channel groove 1 1111 and the S-shaped flow channel groove 2 1211 through the diaphragm 13 .

[0057] In some embodiments, a heating platform 5 may also be included, and the heating platform 5 is used to heat the electrolyte in the anode collecting tank 21 and the cathode collecting tank 22; a gas collecting port is opened at the top of the anode collecting tank 21 and the cathode collecting tank 22 to collect the gas generated by the anode reaction part 11 and the cathode reaction part 12.

[0058] Specifically, a reference electrode 16 is also included to serve as a reference for comparison.

[0059] The specific principle and use method of a method for reducing energy consumption of an electrolytic cell provided in this embodiment are as follows:

[0060] 1. Control the peristaltic pump 3 located in the first circulation pipeline and the peristaltic pump 3 located in the second circulation pipeline, so that the flow rate in the first circulation pipeline and the second circulation pipeline is 7 mL / min, and the flow rate in the second circulation pipeline remains unchanged, and adjust the anolyte flow rate in sequence according to 7, 20, 40, 60, 80, 100, 120, 150, 170, 180, and 190 mL / min, and adjust each step at 400, 800, 1200, 1600, 2000, 2400, 2800, 3200, 3600, 4000, 4400, 4800, and 5000 A / ㎡. Use a DC power supply to test the voltage of the electrolytic cell 1 under each flow rate combination by a constant current method, record the voltage of the electrolytic cell 1 under each step of the electrolyte flow rate through the power supply 4, and substitute the voltage U into the formula to calculate and record, and draw a line graph;

[0061] 2. Control the peristaltic pump 3 located in the first circulation pipeline and the peristaltic pump 3 located in the second circulation pipeline so that the flow rate in the first circulation pipeline and the second circulation pipeline is 7 mL / min, the flow rate in the first circulation pipeline remains unchanged, and the cathode electrolyte flow rate is adjusted in sequence according to 7, 20, 40, 60, 80, 100, 120, and 150 mL / min, and each step is adjusted at 400, 800, 1200, 1600, 2000, 2400, 2800, 3200, 3600, 4000, 4400, 4800, and 5000 A / ㎡. The voltage of the electrolytic cell 1 under each flow rate combination is tested by a constant current method using a DC power supply, and the voltage of the electrolytic cell 1 under each step of the electrolyte flow rate is recorded by the power supply 4, and the voltage U is substituted into the formula for calculation and recording, and a line graph is drawn;

[0062] 3. Control the peristaltic pump 3 located in the first circulation pipeline and the peristaltic pump 3 located in the second circulation pipeline to make the flow rate in the first circulation pipeline and the second circulation pipeline 7 mL / min, adjust the flow rates of the anolyte and the cathode electrolyte in turn at 7, 14, 21, 28, 35, and 42 mL / min, and adjust each step at a current density of 400, 800, 1200, 1600, 2000, 2400, 2800, 3200, 3600, 4000, 4400, 4800, and 5000 A / ㎡. Use a DC power supply to test the voltage of the electrolytic cell 1 under each flow rate combination by a constant current method, record the voltage of the electrolytic cell 1 at each step of the electrolyte flow rate through the power supply 4, substituted the voltage U into the formula for calculation and record, and draw a line graph.

[0063] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for reducing energy consumption of an electrolytic cell, the electrolytic cell comprising an anode reaction part (11), a cathode reaction part (12) and a diaphragm (13), the anode reaction part (11) and the cathode reaction part (12) being arranged relative to each other and having an anode flow channel groove and a cathode flow channel groove correspondingly opened on opposite sides thereof, the diaphragm (13) being located between the anode flow channel groove and the cathode flow channel groove; both ends of the anode flow channel groove and the cathode flow channel groove are connected to a liquid storage tank through a circulation pipe respectively; characterized in that The electrolyte flow rate of the anode flow channel is greater than the electrolyte flow rate of the cathode flow channel.

2. A method for reducing energy consumption of an electrolytic cell according to claim 1, characterized in that: The electrolyte flow rate of the anode flow channel is in the range of 40-150 mL / min; the electrolyte flow rate of the cathode flow channel is in the range of 7-40 mL / min.

3. A method for reducing energy consumption of an electrolytic cell according to claim 2, characterized in that: The difference between the electrolyte flow rate of the anode flow channel and the electrolyte flow rate of the cathode flow channel is greater than 30 mL / min.

4. A method for reducing energy consumption of an electrolytic cell according to claim 1, characterized in that: The electrolyte flow rate of the anode flow channel is 150 mL / min, and the electrolyte flow rate of the cathode flow channel is 7 mL / min.

5. The method for reducing energy consumption of an electrolytic cell according to claim 1, characterized in that: The two ends of the anode flow channel are connected to the liquid storage tank through a first circulation pipeline, and the two ends of the cathode flow channel are connected to the liquid storage tank through a second circulation pipeline. Peristaltic pumps are connected to the pipes of the first circulation pipeline and the second circulation pipeline near the inlet end of the anode flow channel.

6. A method for reducing energy consumption of an electrolytic cell according to claim 1, characterized in that: The anode reaction part (11) comprises an anode plate (111), an anode electrode plate (112), an anode liquid inlet joint (113), an anode liquid outlet joint (114) and an anode electrode ear (115); the first plate surface of the anode plate (111) is provided with an S-shaped flow channel groove 1 (1111); the anode electrode plate (112) is in contact with and cooperates with the first plate surface of the anode plate (111) and its plate surface covers the S-shaped flow channel groove 1 (1111); the anode plate (111) is provided with an anode liquid inlet hole (1112) and an anode liquid outlet hole at both ends of the S-shaped flow channel groove 1 (1111). (1113), the anode liquid inlet joint (113) and the anode liquid outlet joint (114) are located on the second plate surface of the anode plate (111), the anode liquid inlet joint (113) is tightly connected to the anode liquid inlet hole (1112), the anode liquid outlet joint (114) is tightly connected to the anode liquid outlet hole (1113), one end of the anode electrode ear (115) is in contact with the anode electrode plate (112), and the other end passes through the anode plate (111) and is located on the second plate surface of the anode plate (111), and the positive electrode of the power supply (4) is electrically connected to the anode electrode ear (115).

7. A method for reducing energy consumption of an electrolytic cell according to claim 6, characterized in that: The cathode reaction part (12) comprises a cathode plate (121), a cathode electrode plate (122), a cathode liquid inlet joint (123), a cathode liquid outlet joint (124) and a cathode pole ear (125); the first plate surface of the cathode plate (121) is provided with an S-shaped flow channel groove 2 (1211) and is arranged opposite to the first plate surface of the anode plate (111); the cathode electrode plate (122) is in contact with and cooperates with the first plate surface of the cathode plate (121) and its plate surface covers the S-shaped flow channel groove 2 (1211); the cathode plate (121) is provided with cathode liquid inlet holes (123) at both ends of the S-shaped flow channel groove 2 (1211) respectively. 12) and a cathode liquid outlet hole (1213), the cathode liquid inlet joint (123) and the cathode liquid outlet joint (124) are located on the second plate surface of the anode plate (111), the cathode liquid inlet joint (123) is tightly connected to the cathode liquid inlet hole (1212), the cathode liquid outlet joint (124) is tightly connected to the cathode liquid outlet hole (1213), one end of the cathode pole ear (125) is in contact with the cathode electrode plate (122), and the other end passes through the cathode plate (121) and is located on the second plate surface of the cathode plate (121), and the negative pole of the power supply (4) is electrically connected to the cathode pole ear (125).

8. A method for reducing energy consumption of an electrolytic cell according to claim 7, characterized in that: It also includes a sealing sheet (17), wherein a flow opening (171) is provided in the middle of the sealing sheet (17), and the number of the sealing sheets (17) is two, which are symmetrically distributed on both sides of the diaphragm (13) and are in contact with the diaphragm (13), and the two sealing sheets (17) are located between the anode electrode plate (112) and the cathode electrode plate (122), and the two ends of the flow opening (171) are arranged opposite to the anode electrode plate (112) and the cathode electrode plate (122), respectively.

9. A method for reducing energy consumption of an electrolytic cell according to claim 8, characterized in that: The cathode plate (121) and the anode plate (111) are locked by bolts (14) and nuts (15).

10. A method for reducing energy consumption of an electrolytic cell according to claim 6, characterized in that: The invention also comprises a heating platform (5), wherein the heating platform (5) is used to heat the electrolyte in the anode collection tank (21) and the cathode collection tank (22); the top ends of the anode collection tank (21) and the cathode collection tank (22) are provided with gas collection ports to collect the gas generated by the anode reaction part (11) and the cathode reaction part (12).

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