Electrolytic bath cleaning equipment and method

Abstract

The invention provides electrolytic bath cleaning equipment and method, and relates to the technical field of hydrogen production. The cleaning equipment comprises a circulating pipeline, an alkali liquor circulating pump, a gas separation device, a water storage tank, a water pump, a cleaning pipeline, a first drain valve and a second drain valve; an outlet of the circulating pipeline is communicated with an inlet of the alkaline electrolytic bath; the alkali liquor circulating pump is connected in series with the circulating pipeline; a first outlet of the gas separation device is communicated with an inlet of the circulating pipeline; a first inlet of the gas separation device is communicated with an outlet of the alkaline electrolytic bath. According to the cleaning equipment, the time required by the cleaning step can be greatly shortened, and the disassembly and assembly convenience of the whole hydrogen production system is improved; the consumption of pure water required for diluting the alkali liquor is greatly reduced, and resources are saved; when a large amount of alkali liquor is injected into water, the influence of adding water as a solvent on the concentration of the alkali liquor in the whole tank is relatively small, so that the diffusion rate in the tank is relatively slow. The interval water injection and drainage cleaning utilizes mixing of residual alkali liquor and a large amount of water, and the alkali concentration gradient is large, so that the diffusion rate is high, and the cleaning effect of tank body cleaning is better.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen production, and in particular to an electrolytic cell cleaning device and method. Background Art

[0002] Alkaline water electrolysis is a technology that uses KOH or NaOH solution as electrolyte to decompose water into hydrogen and oxygen under the action of direct current. It is widely used in the electronics, pharmaceutical, food and other industries to produce high-purity hydrogen. With the development of renewable energy technology, the combination of water electrolysis and clean energy such as solar energy and wind energy has made it possible to achieve zero carbon emissions and is an important way to achieve energy transformation and carbon neutrality goals. The square electrolyzer is a type of electrolytic hydrogen production equipment with on-site disassembly and maintenance functions.

[0003] At present, the disassembly and maintenance of the square tank includes steps such as draining alkali, cleaning, and frame replacement. The tank body needs to be cleaned to reduce the alkali concentration of the 30% KOH electrolyte in the electrolytic cell to pH ≤ 9 to ensure the safety of personnel during the disassembly and maintenance process. Therefore, the cleaning step is crucial. Usually, in the cleaning step of the square tank, pure water needs to be continuously introduced from the liquid inlet pipe of the electrolytic cell and discharged from the liquid outlet pipe until the pH of the outlet water reaches the qualified standard. This process is time-consuming and accounts for a large proportion of the overall disassembly and maintenance time of the square tank, affecting the convenience of disassembly and assembly of the square tank. Summary of the invention

[0004] The invention provides an electrolytic tank cleaning device, which is used to solve the problem that the cleaning time of the existing electrolytic tank is long.

[0005] The present invention provides an electrolytic tank cleaning device, comprising: A circulation pipeline, wherein the outlet of the circulation pipeline is connected to the inlet of the alkaline electrolytic cell; A lye circulation pump, the lye circulation pump is connected in series to the circulation pipeline; A gas separation device, wherein a first outlet of the gas separation device is connected to an inlet of the circulation pipeline, and the first inlet of the gas separation device is connected to an outlet of the alkaline electrolytic cell; A water storage tank, the outlet of which is connected to the second inlet of the gas separation device via a water supply pipeline, and the water supply pipeline is provided with a first water supply valve; A water pump, the water pump is connected in series to the water supply pipeline; A cleaning pipeline, wherein the water supply pipeline between the water pump and the first water supply valve is connected to the inlet of the cleaning pipeline, the outlet of the cleaning pipeline is connected to the inlet of the alkaline electrolytic cell, and the cleaning pipeline is provided with a cleaning valve; A first drain valve and a second drain valve, wherein the inlet of the first drain valve is connected to the circulation pipeline between the alkali solution circulation pump and the alkaline electrolytic cell, and the outlet of the first drain valve is connected to the inlet of the water pump; the water replenishment pipeline between the water pump and the first water replenishment valve is connected to the inlet of the second drain valve.

[0006] An electrolytic tank cleaning device provided by the present invention also includes: An alkali liquid storage tank, wherein a first outlet of the alkali liquid storage tank is connected to an inlet of the alkali liquid circulation pump through a first pipeline, and the inlet of the alkali liquid storage tank is connected to the circulation pipeline between the alkali liquid circulation pump and the alkaline electrolytic cell through a second pipeline, a first control valve is arranged on the first pipeline, and a second control valve is arranged on the second pipeline.

[0007] According to an electrolytic cell cleaning device provided by the present invention, the second outlet of the alkali solution storage tank is connected to the water replenishment pipeline between the water storage tank and the water pump through a third pipeline, and a third control valve is arranged on the third pipeline.

[0008] According to an electrolytic tank cleaning device provided by the present invention, the first pipeline is connected to the circulation pipeline between the alkali solution circulation pump and the alkaline electrolytic tank through a fourth pipeline.

[0009] According to the electrolytic cell cleaning equipment provided by the present invention, the water storage tank is provided with a liquid level sensor.

[0010] An electrolytic tank cleaning device provided by the present invention also includes: An exhaust and drainage device, wherein the exhaust and drainage device is arranged in the circulation pipeline between the alkali solution circulation pump and the alkaline electrolytic cell; Two pressure gauges are respectively arranged at the outlet of the water pump and the outlet of the alkali solution circulation pump.

[0011] According to an electrolytic cell cleaning device provided by the present invention, a second water replenishment valve is provided at the second inlet of the gas separation device.

[0012] The present invention also provides an electrolytic tank cleaning method, which is based on the electrolytic tank cleaning device described in any one of the above items, comprising: Controlling the cleaning valve to open and the water pump to work, so as to inject the pure water in the water storage tank into the alkaline electrolytic cell, and diluting the residual alkali solution in the alkaline electrolytic cell after the alkali is drained; When the amount of pure water injected into the alkaline electrolytic cell reaches a predetermined amount, controlling the cleaning valve to close and controlling the first drain valve and the second drain valve to open to discharge the dilution liquid in the alkaline electrolytic cell; When the drainage time is equal to the predetermined time, the water pump is controlled to stop working and the first drain valve and the second drain valve are controlled to close; The pH value of the liquid discharged from the second liquid discharge valve is obtained. When the pH value is within a predetermined range, it indicates that the cleaning is completed; when the pH value is greater than the predetermined range, the above steps are repeated in sequence.

[0013] According to an electrolytic cell cleaning method provided by the present invention, after the diluent is discharged, the proportion of the residual diluent in the alkaline electrolytic cell to the volume of the alkaline electrolytic cell is 0.01%-10%.

[0014] According to an electrolytic cell cleaning method provided by the present invention, the flow rate of the water pump when discharging the diluent is 0.5-2 times the flow rate when injecting pure water.

[0015] The electrolytic cell cleaning equipment provided by the present invention can significantly reduce the time required for the cleaning steps, improve the convenience of disassembly and assembly of the entire hydrogen production system; significantly reduce the amount of pure water required to dilute the alkali solution, and save resources; when water is injected into a large amount of alkali solution, the effect of adding water as a solvent on the concentration of the alkali solution in the entire tank is relatively small, so the diffusion rate in the tank is relatively slow. Interval injection and drainage cleaning uses residual alkali solution mixed with a large amount of water, and the alkali concentration gradient is large, so the diffusion rate is fast, and the cleaning effect of the tank body is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a structural schematic diagram of the electrolytic tank cleaning equipment provided by the present invention.

[0018] Figure 2 It is a schematic flow chart of the electrolytic cell cleaning method provided by the present invention.

[0019] Figure 3 It is a comparison diagram of pH-time curves of the electrolytic tank cleaning equipment provided by the present invention and the commonly used continuous water injection and drainage cleaning.

[0020] Reference numerals: 10. Circulation pipeline; 11. Circulation control valve; 12. Exhaust and drainage device; 13. Pressure gauge; 20. Alkaline electrolytic cell; 30. Alkali solution circulation pump; 40. Gas separation device; 41. Oxygen separator; 42. Oxygen separator; 50. Water storage tank; 51. Water supply pipeline; 52. First water supply valve; 53. Liquid level sensor; 54. Second water supply valve; 55. Fifth control valve; 60. Water pump; 70. Cleaning pipeline; 71. Cleaning valve; 81. First liquid discharge valve; 82. Second liquid discharge valve; 90. Alkali solution storage tank; 91. First pipeline; 92. Second pipeline; 93. First control valve; 94. Second control valve; 95. Third pipeline; 96. Third control valve; 97. Fourth pipeline. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0023] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0024] In the embodiments of the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0025] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0026] Combine the following Figure 1 The specific structure and use method of the electrolytic tank cleaning device of the present invention are described.

[0027] like Figure 1 As shown, the electrolytic cell cleaning equipment includes a circulation pipeline 10, an alkali liquid circulation pump 30, a gas separation device 40, a water storage tank 50, a water pump 60, a cleaning pipeline 70, a first liquid discharge valve 81 and a second liquid discharge valve 82. The outlet of the circulation pipeline 10 is connected to the inlet of the alkaline electrolytic cell 20, and the alkali liquid circulation pump 30 is connected in series to the circulation pipeline 10. The first outlet of the gas separation device 40 is connected to the inlet of the circulation pipeline 10, and the first inlet of the gas separation device 40 is connected to the outlet of the alkaline electrolytic cell 20. The water storage tank 50 is used to store pure water, and the outlet of the water storage tank 50 is connected to the second inlet of the gas separation device 40 through the water supply pipeline 51, and the water supply pipeline 51 is provided with a first water supply valve 52. The water pump 60 is connected in series to the water replenishment pipeline 51. The water replenishment pipeline 51 between the water pump 60 and the first water replenishment valve 52 is connected to the inlet of the cleaning pipeline 70. The outlet of the cleaning pipeline 70 is connected to the inlet of the alkaline electrolytic cell 20. The cleaning pipeline 70 is provided with a cleaning valve 71. The cleaning pipeline 70 is used to input pure water into the alkaline electrolytic cell 20 and clean the alkaline electrolytic cell 20 with pure water.

[0028] The inlet of the first drain valve 81 is connected to the circulation pipeline 10 between the alkali liquid circulation pump 30 and the alkaline electrolytic cell 20, and the outlet of the first drain valve 81 is connected to the inlet of the water pump 60; the water replenishment pipeline 51 between the water pump 60 and the first water replenishment valve 52 is connected to the inlet of the second drain valve 82. The first drain valve 81 and the second drain valve 82 are used to discharge the alkali liquid or diluent in the alkaline electrolytic cell 20. The first drain valve 81 and the second drain valve 82 are usually in a closed state. When the alkali liquid or diluent needs to be discharged, the first drain valve 81 and the second drain valve are opened.

[0029] The electrolytic cell cleaning equipment provided by the present invention can greatly reduce the time required for the cleaning steps, improve the convenience of disassembly and assembly of the entire hydrogen production system; greatly reduce the amount of pure water required to dilute the alkali solution, and save resources; when water is injected into a large amount of alkali solution, the effect of adding water as a solvent on the concentration of the alkali solution in the entire tank is relatively small, so the diffusion rate in the tank is relatively slow. Interval injection and drainage cleaning uses residual alkali solution mixed with a large amount of water, and the alkali concentration gradient is large, so the diffusion rate is fast, and the cleaning effect of the tank body is better.

[0030] In one embodiment of the present invention, the gas separation device 40 includes an oxygen separator 41 and a hydrogen separator 42. The circulation pipeline 10 has two inlets, and correspondingly, the alkaline electrolyzer 20 has two outlets. The first outlet of the oxygen separator 41 is connected to one inlet of the circulation pipeline 10, and the first inlet of the oxygen separator 40 is connected to one outlet of the alkaline electrolyzer 20. The first outlet of the hydrogen separator 42 is connected to the other inlet of the circulation pipeline 10, and the first inlet of the hydrogen separator 42 is connected to the other outlet of the alkaline electrolyzer 20.

[0031] In one embodiment of the present invention, the electrolytic tank cleaning equipment further includes an alkali liquid storage tank 90, a first outlet of the alkali liquid storage tank 90 is connected to the inlet of the alkali liquid circulation pump 30 through a first pipeline 91, and the inlet of the alkali liquid storage tank 90 is connected to the circulation pipeline 10 between the alkali liquid circulation pump 30 and the alkaline electrolytic tank 20 through a second pipeline 92, a first control valve 93 is provided on the first pipeline 91, and a second control valve 94 is provided on the second pipeline 92; the supply and recovery of the alkali liquid in the circulation pipeline 10 can be controlled by providing the first control valve 93 and the second control valve 94. During the cleaning process, the first control valve 93 and the second control valve 94 are in a closed state; when it is necessary to inject alkali liquid into the alkaline electrolytic tank 20, the first control valve 93 and the second control valve 94 are opened, and the alkali liquid circulation pump 30 is turned on to start working, so that the alkali liquid in the alkali liquid storage tank 90 can be transported to the circulation pipeline 10 through the alkali liquid circulation pump 30, and finally the alkali liquid enters the alkaline electrolytic tank 20.

[0032] In one embodiment of the present invention, the second outlet of the alkali solution storage tank 90 is connected to the water supply pipeline 51 between the water storage tank 50 and the water pump 60 through the third pipeline 95, and a third control valve 96 is provided on the third pipeline 95. The third control valve 96 is used to control the conduction and closing of the third pipeline 95. During the cleaning process, the third control valve 96 is in a closed state.

[0033] In one embodiment of the present invention, the first pipeline 91 is connected to the circulation pipeline 10 between the alkali solution circulation pump 30 and the alkaline electrolytic cell 20 through the fourth pipeline 97. By providing the fourth pipeline 97, the first pipeline 91 can be connected to the circulation pipeline 10, and the first pipeline 91, the circulation pipeline 10 and the cleaning pipeline 70 form a circulation loop. The second control valve 94, the third control valve 96 and the cleaning valve 71 are opened, and the water pump 60 is controlled to work, and the alkali solution storage tank 90 can be automatically cleaned with pure water.

[0034] In one embodiment of the present invention, the water tank 50 is provided with a liquid level sensor 53, which is used to detect the pure water level in the water tank 50. By detecting the change of the pure water level, the amount of pure water output by the water tank 50 can be calculated.

[0035] In one embodiment of the present invention, the electrolytic tank cleaning equipment further includes an exhaust and drainage device 12 and two pressure gauges 13. The exhaust and drainage device 12 is arranged in the circulation pipeline 10 between the alkali liquid circulation pump 30 and the alkaline electrolytic tank 20. Since the pressure in the circulation pipeline 10 will change during the process of injecting pure water into the circulation pipeline 10, it is necessary to discharge part of the water or gas in the circulation pipeline 10 through the exhaust and drainage device 12 to ensure that the pressure in the circulation pipeline 10 is within a predetermined range. The exhaust and drainage device 12 has two connecting ports, both of which are connected to the circulation pipeline 10, and each connecting port is provided with a control valve. When both control valves are closed, the exhaust and drainage device 12 is disconnected from the circulation pipeline 10; when both control valves are opened, the exhaust and drainage device 12 is connected to the circulation pipeline 10.

[0036] Two pressure gauges 13 are respectively arranged at the outlet of the water pump 60 and the outlet of the alkali liquid circulation pump 30. The pressure gauge 13 arranged at the outlet of the water pump 60 is used to detect the pressure value at the outlet of the water pump 60, and the flow rate of the water flow can be calculated by the pressure value. The pressure gauge 13 arranged at the outlet of the alkali liquid circulation pump 30 is used to detect the pressure value at the outlet of the alkali liquid circulation pump 30, and the flow rate of the water flow can be calculated by the pressure value.

[0037] In one embodiment of the present invention, the second inlet of the oxygen separator 41 and the hydrogen separator 42 are both provided with a second water replenishment valve 54. The water replenishment pipeline 51 is used to replenish water to the circulation pipeline 10. By providing the second water replenishment valve 54 at the second inlet of the oxygen separator 41 and the hydrogen separator 42, the oxygen separator 41 or the hydrogen separator 42 can be controlled separately, and pure water can be input to the oxygen separator 41 or the hydrogen separator 42 separately or to both the oxygen separator 41 and the hydrogen separator 42 at the same time.

[0038] In one embodiment of the present invention, the electrolytic tank cleaning equipment also includes a control device, which is electrically connected to the water pump 60, the alkali solution circulation pump 30, the liquid level sensor 53, the pressure gauge 13 and all valves, and the control device is used to perform parameter control on the valve opening and the pump head.

[0039] In one embodiment of the present invention, three circulation control valves 11 are further provided on the circulation pipeline 10, wherein one circulation control valve 11 is provided on the circulation pipeline 10 between the fourth pipeline 97 and the first water replenishment valve 52, one circulation control valve 11 is provided on the circulation pipeline 10 between the alkali liquid circulation pump 30 and the second pipeline 92, and another circulation control valve 11 is provided on the circulation pipeline 10 between the alkali liquid circulation pump 30 and the oxygen separator 41.

[0040] In one embodiment of the present invention, the water supply pipeline 51 is provided with two fifth control valves 55 , wherein one fifth control valve 55 is provided at the inlet of the water pump 60 , and the other fifth control valve 55 is provided at the outlet of the water pump 60 .

[0041] The electrolytic cell cleaning equipment provided by the present invention can greatly reduce the time required for the cleaning steps, improve the convenience of disassembly and assembly of the entire hydrogen production system; greatly reduce the amount of pure water required to dilute the alkali solution, and save resources; when water is injected into a large amount of alkali solution, the effect of adding water as a solvent on the concentration of the alkali solution in the entire tank is relatively small, so the diffusion rate in the tank is relatively slow. Interval injection and drainage cleaning uses residual alkali solution mixed with a large amount of water, and the alkali concentration gradient is large, so the diffusion rate is fast, and the cleaning effect of the tank body is better.

[0042] like Figure 2 As shown, the present invention further provides an electrolytic tank cleaning method, the cleaning method is based on the electrolytic tank cleaning device described in any one of the above embodiments, and the electrolytic tank cleaning method comprises: Step S100, controlling the cleaning valve 71 to open and controlling the water pump 60 to work, so as to inject the pure water in the water storage tank 50 into the alkaline electrolytic cell 20, and dilute the residual alkali solution in the alkaline electrolytic cell 20 after the alkali is drained; After the cleaning valve 71 is opened, the cleaning pipeline 70 connects the water supply pipeline 51 with the alkaline electrolytic cell 20. After the water pump 60 works, the pure water in the water supply pipeline 51 is transported to the alkaline electrolytic cell 20 through the cleaning pipeline 70 to dilute the residual alkali solution in the alkaline electrolytic cell 20 after draining.

[0043] Step S200, when the amount of pure water injected into the alkaline electrolytic cell 20 reaches a predetermined amount, the cleaning valve 71 is controlled to be closed and the first drain valve 81 and the second drain valve 82 are controlled to be opened to discharge the dilution liquid in the alkaline electrolytic cell 20; The liquid level sensor 53 detects the liquid level in the water tank 50 in real time. When the liquid level in the water tank 50 drops to a predetermined height, it indicates that the amount of pure water injected into the alkaline electrolytic cell 20 reaches a predetermined amount. At this time, the cleaning valve 71 is controlled to be closed, so that the cleaning pipeline 70 is disconnected, and the first drain valve 81 and the second drain valve 82 are controlled to be opened, so that the drain pipeline is connected to the alkaline electrolytic cell 20, and the dilution liquid begins to be discharged.

[0044] Step S300, when the drainage time is equal to the predetermined time, the water pump 60 is controlled to stop working and the first drain valve 81 and the second drain valve 82 are controlled to be closed; When the displacement of the water pump 60 is fixed, the amount of diluent to be discharged is proportional to the drainage time. After the diluent is discharged, the residual diluent in the alkaline electrolytic cell 20 accounts for 0.01%-10% of the volume of the alkaline electrolytic cell 20. Preferably, the residual diluent in the alkaline electrolytic cell 20 accounts for 1% of the volume of the alkaline electrolytic cell 20. The predetermined time is calculated based on the time required for the alkaline electrolytic cell 20 to be discharged to the above-mentioned proportional value. When the drainage time is equal to the predetermined time, the water pump 60 is controlled to stop working and the first drain valve 81 and the second drain valve 82 are controlled to be closed, and a cleaning cycle is completed at this time.

[0045] Step S400, obtaining the pH value of the liquid discharged from the second liquid discharge valve 82, and when the pH value is within a predetermined range, it indicates that the cleaning is completed; when the pH value is greater than the predetermined range, the above steps are repeated in sequence.

[0046] The liquid outlet of the second liquid discharge valve 82 is provided with a pH detection device. When the pH value is within a predetermined range, the pH value of the residual dilution liquid in the alkaline electrolytic cell 20 is within a reasonable range, indicating that the cleaning is complete. When the pH value is greater than the predetermined range, the pH does not meet the standard, and the above steps are repeated in sequence to perform the next cleaning cycle, and pure water is re-injected into the alkaline electrolytic cell 20 to dilute the residual liquid again.

[0047] In one embodiment of the present invention, the flow rate of the water pump 60 when discharging the diluent is 0.5-2 times the flow rate when injecting pure water. Preferably, the flow rate of the water pump 60 when discharging the diluent is 1 times the flow rate when injecting pure water.

[0048] In one embodiment of the present invention, the water filling time and drainage time are 1 to 3 times of the theoretical filling and emptying time, preferably 1.

[0049] In order to more intuitively reflect the advantages of the electrolytic tank cleaning device of the present invention, the time consumption of the commonly used continuous water injection and drainage cleaning system is compared with the cleaning time consumption of the electrolytic tank cleaning device of the present invention: The concentration of alkali solution in the alkaline electrolytic cell is defined as c The cleaning time is t , 30% KOH initial concentration c 0 is 6.9 mol / L; continuous injection and drainage cleaning takes time t 1 , the volume of the alkaline electrolytic cell is V , the pure water injection and discharge flow rates are q The relationship between the time required for continuous water injection and drainage cleaning and the alkali concentration in the alkaline electrolytic cell is expressed by the following formula (1).

[0050] (1) The cleaning of the electrolytic tank cleaning device of the present invention is time-consuming. t 2 , set the residual volume fraction after each drainage s 1% is used as the drainage standard, the drainage flow is the same as the injection flow, and the corresponding required cleaning cycle number is x The relationship between the total cleaning time of the electrolytic tank cleaning equipment of the present invention and the alkali concentration in the alkaline electrolytic tank is as follows (2): (2) in, Round up, each cycle is divided into water injection process and drainage process, and the start time of each water injection is t i , corresponding to the initial concentration of alkali solution c i , the alkali concentration of a single drainage process remains unchanged; the relationship between the time and alkali concentration of a single water injection process is expressed by the following formula (3): (3) like Figure 3 As shown in the pH-time curves corresponding to the two different cleaning methods, the cleaning time of the electrolytic cell cleaning device of the present invention is reduced by 55.4% compared with the continuous water injection and drainage cleaning system, and the pure water consumption is reduced by 77.7%.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electrolytic cell cleaning device, characterized in that: include: A circulation pipeline (10), wherein the outlet of the circulation pipeline (10) is connected to the inlet of the alkaline electrolytic cell (20); an alkali solution circulation pump (30), the alkali solution circulation pump (30) being connected in series to the circulation pipeline (10); A gas separation device (40), wherein a first outlet of the gas separation device (40) is in communication with an inlet of the circulation pipeline (10), and the first inlet of the gas separation device (40) is in communication with an outlet of the alkaline electrolytic cell (20); A water storage tank (50), wherein an outlet of the water storage tank (50) is connected to a second inlet of the gas separation device (40) via a water replenishment pipeline (51), and the water replenishment pipeline (51) is provided with a first water replenishment valve (52); A water pump (60), the water pump (60) being connected in series to the water supply pipeline (51); a cleaning pipeline (70), wherein the water replenishment pipeline (51) between the water pump (60) and the first water replenishment valve (52) is in communication with an inlet of the cleaning pipeline (70), an outlet of the cleaning pipeline (70) is in communication with an inlet of the alkaline electrolytic cell (20), and the cleaning pipeline (70) is provided with a cleaning valve (71); A first liquid discharge valve (81) and a second liquid discharge valve (82), wherein the inlet of the first liquid discharge valve (81) is in communication with the circulation pipeline (10) between the alkali liquid circulation pump (30) and the alkaline electrolytic cell (20), and the outlet of the first liquid discharge valve (81) is in communication with the inlet of the water pump (60); and the water replenishment pipeline (51) between the water pump (60) and the first water replenishment valve (52) is in communication with the inlet of the second liquid discharge valve (82).

2. The electrolytic tank cleaning device according to claim 1, characterized in that: Also includes: An alkali liquid storage tank (90), a first outlet of the alkali liquid storage tank (90) being connected to an inlet of the alkali liquid circulation pump (30) via a first pipeline (91), and an inlet of the alkali liquid storage tank (90) being connected to a circulation pipeline (10) between the alkali liquid circulation pump (30) and the alkaline electrolytic cell (20) via a second pipeline (92), a first control valve (93) being provided on the first pipeline (91), and a second control valve (94) being provided on the second pipeline (92).

3. The electrolytic tank cleaning equipment according to claim 2, characterized in that: The second outlet of the alkali solution storage tank (90) is connected to the water replenishment pipeline (51) between the water storage tank (50) and the water pump (60) via a third pipeline (95), and a third control valve (96) is provided on the third pipeline (95).

4. The electrolytic tank cleaning device according to claim 2, characterized in that: The first pipeline (91) is connected to the circulation pipeline (10) between the alkali solution circulation pump (30) and the alkaline electrolytic cell (20) through a fourth pipeline (97).

5. The electrolytic tank cleaning device according to any one of claims 1 to 4, characterized in that: The water storage tank (50) is provided with a liquid level sensor (53).

6. The electrolytic tank cleaning device according to any one of claims 1 to 4, characterized in that: Also includes: An exhaust and drainage device (12), wherein the exhaust and drainage device (12) is arranged in the circulation pipeline (10) between the alkali solution circulation pump (30) and the alkaline electrolytic cell (20); Two pressure gauges (13), the two pressure gauges (13) being respectively arranged at the outlet of the water pump (60) and the outlet of the alkali solution circulation pump (30).

7. The electrolytic tank cleaning device according to claim 2, characterized in that: The second inlet of the gas separation device (40) is provided with a second water replenishment valve (54).

8. An electrolytic cell cleaning method, the cleaning method is based on the electrolytic cell cleaning device according to any one of claims 1 to 7, characterized in that: include: Controlling the cleaning valve (71) to open and controlling the water pump (60) to operate so as to inject pure water in the water storage tank (50) into the alkaline electrolytic cell (20) to dilute the residual alkali solution in the alkaline electrolytic cell (20) after alkali drainage; When the amount of pure water injected into the alkaline electrolytic cell (20) reaches a predetermined amount, the cleaning valve (71) is controlled to be closed and the first drain valve (81) and the second drain valve (82) are controlled to be opened, so as to discharge the diluted liquid in the alkaline electrolytic cell (20); When the drainage time is equal to the predetermined time, controlling the water pump (60) to stop working and controlling the first drainage valve (81) and the second drainage valve (82) to close; The pH value of the liquid discharged from the second liquid discharge valve (82) is obtained. When the pH value is within a predetermined range, it indicates that the cleaning is complete. When the pH value is greater than the predetermined range, the above steps are repeated in sequence.

9. The electrolytic cell cleaning method according to claim 8, characterized in that: After the diluent is discharged, the proportion of the residual diluent in the alkaline electrolytic cell (20) to the volume of the alkaline electrolytic cell (20) is 0.01%-10%.

10. The electrolytic cell cleaning method according to claim 8, characterized in that: The flow rate of the water pump (60) when discharging the diluent is 0.5-2 times the flow rate when injecting pure water.

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