Device for preparing sodium hypochlorite by electrolyzing seawater

Abstract

The utility model relates to a device for preparing sodium hypochlorite by electrolyzing seawater. The sodium hypochlorite electrolytic tank is provided with an independent liquid inlet, an independent acid inlet, an independent liquid outlet and an independent acid outlet, and the liquid inlet, the acid inlet, the liquid outlet and the acid outlet are each provided with an electric valve. The sodium hypochlorite electrolyzer is electrically connected with an electrolysis power supply; the liquid inlet is connected with the seawater pretreatment mechanism and the water replenishing and flushing mechanism; the liquid outlet is connected with an inlet of a first gas-liquid separator, and a liquid outlet of the first gas-liquid separator is communicated with a sodium hypochlorite storage tank; the acid inlet and the acid outlet are connected with a polar plate cleaning mechanism, the polar plate cleaning mechanism comprises a second gas-liquid separator connected to the acid outlet, a liquid outlet of the second gas-liquid separator is communicated with a filter, the filter is communicated with an inlet of an acid pickling tank, an outlet of the acid pickling tank is connected with an acid circulating pump, the acid pickling tank is provided with a drain outlet, and the drain outlet is provided with a drain valve. The blow-down valve is communicated with the wastewater pool through a pipeline; the pickling tank is connected with an acid supplementing mechanism, and a first PH sensor is arranged in the pickling tank.

Description

Technical Field

[0001] The utility model relates to the technical field of sodium hypochlorite preparation devices, in particular to a device for preparing sodium hypochlorite by electrolyzing seawater. Background Art

[0002] Seawater contains sodium chloride, the raw material for preparing sodium hypochlorite. Preparing sodium hypochlorite from seawater has a cost advantage. The process of preparing sodium hypochlorite by electrolyzing seawater involves a series of chemical reactions. In this process, chloride ions in seawater are electrolyzed in the electrolytic cell to produce sodium hypochlorite. The chemical reactions are as follows: Anodic reaction: 2Cl - →Cl2 + 2e - ; Cathodic reaction: 2H2O + 2e - →2OH - + H2↑

[0003] Inter-electrode chemical reaction: Cl2 + 2OH - →ClO - + Cl - + H2O, and then ClO - + H2O → HClO + OH - . Total reaction: NaCl + H2O → NaClO + H2↑. However, seawater contains a large amount of calcium and magnesium ions. During the process of electrolyzing seawater, calcium and magnesium ions will form deposits on the cathode, resulting in an increase in the cell voltage of the electrolytic cell, a decrease in the current efficiency, an increase in energy consumption when preparing the same amount of sodium hypochlorite. On the other hand, the large accumulation of deposits between the electrodes affects the contact between the electrodes and ions, further reducing the efficiency of preparing sodium hypochlorite. Summary of the Utility Model

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the utility model provides a device for preparing sodium hypochlorite by electrolyzing seawater.

[0005] The utility model provides a device for preparing sodium hypochlorite by electrolyzing seawater, including: a sodium hypochlorite electrolytic cell configured with an independent liquid inlet, an acid inlet, an independent liquid outlet, and an acid outlet, and electric valves are respectively arranged at the liquid inlet, the acid inlet, the liquid outlet, and the acid outlet;

[0006] The sodium hypochlorite electrolytic cell is electrically connected to an electrolysis power supply;

[0007] The liquid inlet is connected to a seawater pretreatment mechanism and a water replenishment and flushing mechanism;

[0008] The liquid outlet is connected to the inlet of a first gas-liquid separator, and the liquid outlet of the first gas-liquid separator communicates with a sodium hypochlorite storage tank;

[0009] The acid inlet and the acid outlet are connected to the plate cleaning mechanism. Among them, the plate cleaning mechanism includes: a second gas-liquid separator connected to the acid outlet, a liquid outlet of the second gas-liquid separator is connected to a filter, the filter is connected to an inlet of a pickling tank, an outlet of the pickling tank is connected to an acid circulation pump, the pickling tank is provided with a sewage outlet, a sewage valve is arranged at the sewage outlet, and the sewage valve is connected to a waste water tank through a pipeline; the pickling tank is connected to a make-up acid mechanism, and a first pH sensor is arranged in the pickling tank.

[0010] Furthermore, the sodium hypochlorite electrolytic cell includes: a cell body, connection flanges are respectively arranged at both ends of the cell body; one of the connection flanges fixes an outlet water flange, a liquid outlet and an acid outlet communicating with the cell body are arranged on the outlet water flange, an anode conductive plate is clamped between the connection flange and the outlet water flange, and an anode joint extending beyond the flange range is arranged on the anode conductive plate; the other connection flange fixes an inlet water flange, a liquid inlet and an acid inlet communicating with the cell body are arranged on the inlet water flange, a cathode conductive plate is clamped between the connection flange and the inlet water flange, and a cathode joint extending beyond the flange range is arranged on the cathode conductive plate, and insulating sealing rings are respectively arranged on both sides of the anode conductive plate and the cathode conductive plate;

[0011] A plate fixing frame is arranged in the cell body, the plate fixing frame fixes the anode plate and the cathode plate through a plate separation groove, and the anode plate and the cathode plate are alternately arranged, and the anode plate and the cathode plate are respectively connected to the anode conductive plate and the cathode conductive plate.

[0012] Furthermore, the plate fixing frame includes: a plurality of plate separation frames, the plate separation frames include frames and plate separation grooves arranged inside the frames; the plate separation frames are connected to a frame body, and a plurality of baffle plates are arranged on the frame body.

[0013] Furthermore, the cell body is provided with a second pH sensor, a pressure sensor and a temperature sensor, and a window for observing the state of the plates is arranged on the cell body.

[0014] Furthermore, the seawater pretreatment mechanism includes: a water pump, the water pump is connected to a seawater reaction filter, and the seawater reaction filter is connected to a brine storage tank;

[0015] An outlet of the brine storage tank is connected to an inlet of a brine booster pump; an outlet of the brine booster pump is connected to a first one-way valve, and the first one-way valve is connected to the liquid inlet of the sodium hypochlorite electrolytic cell through a pipeline, and the first one-way valve allows brine to flow from the brine booster pump to the liquid inlet of the sodium hypochlorite electrolytic cell;

[0016] The brine storage tank is provided with a conductivity sensor, a stirring mechanism is arranged in the brine storage tank, and a salt adding port is arranged on the brine storage tank.

[0017] Further, the water replenishing and flushing mechanism includes: a water tank, a water valve is arranged at the water outlet of the water tank, the water valve is connected to a flow regulating valve through a pipeline, a flow meter is arranged on the downstream pipeline of the flow regulating valve, a second one-way valve is connected to the downstream of the flow meter, the second one-way valve is connected to the liquid inlet of the sodium hypochlorite electrolytic cell, and the second one-way valve allows water to flow from the water tank to the liquid inlet of the sodium hypochlorite electrolytic cell.

[0018] Further, the acid replenishing mechanism includes: a hydrochloric acid storage tank, an acid replenishing valve is arranged at the outlet of the hydrochloric acid storage tank, and the acid replenishing valve is connected to the pickling tank.

[0019] Further, a hypochlorite sensor is arranged at the liquid outlet of the sodium hypochlorite electrolytic cell; the electrolysis power supply is configured with a voltage sensor for detecting the electrolysis voltage and a current sensor for detecting the electrolysis current.

[0020] The above technical solutions provided by the embodiments of the present invention have the following advantages compared with the prior art:

[0021] The sodium hypochlorite electrolytic cell of the present application is configured with an independent liquid inlet, an acid inlet, an independent liquid outlet and an acid outlet. Electric valves are respectively arranged at the liquid inlet, the acid inlet, the liquid outlet and the acid outlet; the liquid inlet is connected to the seawater pretreatment mechanism and the water replenishing and flushing mechanism; the liquid outlet is connected to the inlet of the first gas-liquid separator, the liquid outlet of the first gas-liquid separator is communicated with the sodium hypochlorite storage tank, and the gas outlet of the first gas-liquid separator is arranged; the acid inlet and the acid outlet are connected to the electrode plate cleaning mechanism. The electrode plate cleaning mechanism includes: a second gas-liquid separator connected to the acid outlet, the liquid outlet of the second gas-liquid separator is connected to a filter, the filter is communicated with the inlet of the pickling tank, the outlet of the pickling tank is connected to an acid circulation pump, a sewage outlet is arranged on the pickling tank, a sewage discharge valve is arranged at the sewage outlet, and the sewage discharge valve is connected to a waste water tank through a pipeline; the pickling tank is connected to the acid replenishing mechanism, and a first pH sensor is arranged in the pickling tank. The sodium hypochlorite electrolytic cell of the present application supports selecting pickling or electrolysis or flushing operation after pickling by controlling the state of the electric valve. During electrolysis, electrolysis raw materials are supplied through the seawater pretreatment mechanism, and clear water is quantitatively supplemented through the water replenishing and flushing mechanism. During pickling, the electrode plate cleaning mechanism controls the circulation of dilute hydrochloric acid to clean the deposits in the sodium hypochlorite electrolytic cell. The second gas-liquid separator separates the gas and liquid generated by pickling. The filter filters the whole-piece exfoliated deposits. The first pH sensor is used to detect the concentration of hydrochloric acid, and supports acid replenishment through the acid replenishing mechanism according to the hydrochloric acid concentration. After pickling, the water replenishing and flushing mechanism provides clear water to flush the sodium hypochlorite electrolytic cell, and the waste water still discharges through the electrode plate cleaning mechanism, avoiding a large amount of calcium and magnesium ions remaining in the sodium hypochlorite electrolytic cell. The present application can efficiently pickle and treat deposits and wash away the calcium and magnesium ions after cleaning. Description of the Drawings

[0022] The accompanying drawings here are incorporated into the description and form a part of this description, showing embodiments consistent with the present utility model and, together with the description, are used to explain the principles of the present utility model.

[0023] To more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a schematic diagram of a device for preparing sodium hypochlorite by electrolyzing seawater provided by an embodiment of the present utility model.

[0025] Figure 2 It is a schematic diagram of a sodium hypochlorite electrolytic cell provided by an embodiment of the present utility model;

[0026] Figure 3 It is a schematic diagram of a tank body and a connecting flange provided by an embodiment of the present utility model;

[0027] Figure 4 It is a schematic diagram of a plate fixing frame provided by an embodiment of the present utility model.

[0028] The numbers and their meanings in the figures are as follows:

[0029] 1. Sodium hypochlorite electrolytic cell, 11. Tank body, 12. Connecting flange, 13. Outlet flange, 14. Anode conductive plate, 15. Inlet flange, 16. Cathode conductive plate, 17. Plate fixing frame, 171. Plate separator, 172. Frame body, 173. Baffle plate, 18. Anode plate, 19. Cathode plate;

[0030] 2. Seawater pretreatment mechanism,

[0031] 3. Water replenishment and flushing mechanism,

[0032] 4. First gas-liquid separator,

[0033] 5. Electrolysis power supply,

[0034] 6. Plate cleaning mechanism, 61. Second gas-liquid separator, 62. Filter, 63. Pickling tank, 64. Acid circulation pump, 65. Drain valve;

[0035] 7. Acid replenishment mechanism, 71. Hydrochloric acid storage tank, 72. Acid replenishment valve;

[0036] 8. Sodium hypochlorite storage tank. Detailed implementation manners

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0038] It should be noted that in this text, the term "comprising", "including", or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or device including a series of elements not only includes those elements but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article, or device. Without further limitation, an element defined by the phrase "including one..." does not exclude the existence of additional identical elements in the process, method, article, or device including the said element.

[0039] Refer to Figure 1 As shown, the embodiments of the present utility model provide a device for preparing sodium hypochlorite by electrolyzing seawater, including:

[0040] A sodium hypochlorite electrolytic cell 1 configured with an independent liquid inlet, an acid inlet, an independent liquid outlet, and an acid outlet, and electric valves are respectively arranged at the liquid inlet, the acid inlet, the liquid outlet, and the acid outlet.

[0041] During the specific implementation process, as Figure 2 shown, the sodium hypochlorite electrolytic cell 1 includes:

[0042] A cylindrical cell body 11, and the cell body 11 is provided with a second pH sensor for measuring the pH value in the cell body, a pressure sensor for measuring the pressure in the cell body, and a temperature sensor for measuring the temperature in the cell body. As Figure 3 shown, a plurality of windows are arranged on the cell body 11, and the windows are sealed with glass.

[0043] Connection flanges 12 are respectively arranged at both ends of the cell body 11; one of the connection flanges 12 fixes a water outlet flange 13, and the water outlet flange 13 is provided with a liquid outlet and an acid outlet communicating with the cell body 11. An anode conductive plate 14 is clamped between the connection flange and the water outlet flange, and the anode conductive plate 14 is provided with an anode joint extending beyond the flange range; the other connection flange 12 fixes a water inlet flange 15, and the water inlet flange 15 is provided with a liquid inlet and an acid inlet communicating with the cell body 11. A cathode conductive plate 16 is clamped between the connection flange and the water inlet flange, and the cathode conductive plate 16 is provided with a cathode joint extending beyond the flange range; insulating sealing rings are respectively arranged on both sides of the anode conductive plate 14 and the cathode conductive plate 16.

[0044] A plate fixing frame 17 is arranged in the tank body 11. The plate fixing frame 17 fixes the anode plate 18 and the cathode plate 19 through a plate separation tank, and the anode plate 18 and the cathode plate 19 are arranged alternately. The anode plate 18 and the cathode plate 19 are respectively connected to the anode conductive plate 14 and the cathode conductive plate 16. In the specific implementation process, the window surface of the viewing window is perpendicular to the plates in the tank body 11 to observe the sediment on the plate surface of the cathode plate 19. In the specific implementation process, as Figure 4 shown, the plate fixing frame 17 includes: a plurality of plate separation frames 171, and each plate separation frame 171 includes a frame and a plate separation tank arranged inside the frame; the plate separation frames 171 are connected to a frame body 172, and the plate separation frames 171 are connected into a whole through the frame body 172. A plurality of baffle plates 173 are arranged on the frame body 172, and the baffle plates 173 are used to restrict the flow of the electrolyte and improve the electrolysis effect.

[0045] The liquid inlet is connected to the seawater pretreatment mechanism 2 and the water replenishing and flushing mechanism 3. In the specific implementation process, the seawater pretreatment mechanism 2 is used to provide brine for electrolysis. The seawater pretreatment mechanism 2 includes: a water pump 21, the water pump 21 is connected to a seawater reaction filter 22, a sodium carbonate precipitant is added to the seawater reaction filter 22, and part of the calcium and magnesium ions are precipitated by carbonate ions. The precipitate is filtered by the seawater reaction filter, and the seawater reaction filter is connected to a brine storage tank 23. The outlet of the brine storage tank 23 is connected to the inlet of a brine booster pump 24; the outlet of the brine booster pump 24 is connected to a first one-way valve 25, and the first one-way valve 25 is connected to the liquid inlet of the sodium hypochlorite electrolytic cell 1 through a pipeline. The first one-way valve 25 allows the brine to flow from the brine booster pump to the liquid inlet of the sodium hypochlorite electrolytic cell 1. The brine storage tank 23 is provided with a conductivity sensor 26, a stirring mechanism is arranged in the brine storage tank 23, and a salt adding port is arranged on the brine storage tank 23. The concentration of NaCl in seawater is relatively low, which is not conducive to electrolysis. During the pretreatment process, NaCl is added to the brine storage tank 23 until the conductivity of the seawater reaches the set threshold.

[0046] The water replenishing and rinsing mechanism 3 is used to replenish water during the electrolysis process and perform rinsing after pickling. Specifically, the water replenishing and rinsing mechanism 3 includes: a water tank 31, a water valve 32 is provided at the water outlet of the water tank 31, the water valve 32 is connected to a flow regulating valve 33 through a pipeline, a flow meter 34 is provided on the downstream pipeline of the flow regulating valve 33, the downstream of the flow meter 34 is connected to a second check valve 35, and the second check valve 35 is connected to the liquid inlet of the sodium hypochlorite electrolyzer 1. The second check valve 35 allows water to flow from the water tank to the liquid inlet of the sodium hypochlorite electrolyzer 1. During the water replenishing process, the water valve 32 is turned on, and the flow rate of the replenished water is adjusted through the flow regulating valve. During the rinsing process, the water valve 32 is turned on, and the flow regulating valve is opened to the maximum flow rate to supply clean water to the sodium hypochlorite electrolyzer 1 after pickling.

[0047] The liquid outlet is connected to the inlet of the first gas-liquid separator 4, and the liquid outlet of the first gas-liquid separator 4 is communicated with the sodium hypochlorite storage tank 8; the generated hydrogen and liquid are separated through the first gas-liquid separator 4.

[0048] The acid inlet and the acid outlet are connected to the electrode plate cleaning mechanism 6. Among them, the electrode plate cleaning mechanism 6 includes: a second gas-liquid separator 61 connected to the acid outlet, the liquid outlet of the second gas-liquid separator 61 is connected to a filter 62, the filter 62 is communicated with the inlet of the pickling tank 63, the outlet of the pickling tank 63 is connected to an acid circulation pump 64, the pickling tank 63 is provided with a sewage outlet, a sewage valve 65 is provided at the sewage outlet, and the sewage valve 65 is connected to the waste water tank through a pipeline; the pickling tank 63 is connected to an acid replenishing mechanism 7, and a first pH sensor is arranged in the pickling tank 63.

[0049] The acid replenishing mechanism 7 is used to provide dilute hydrochloric acid. The acid replenishing mechanism 7 includes: a hydrochloric acid storage tank 71, a replenishing acid valve 72 is provided at the outlet of the hydrochloric acid storage tank 71, the replenishing acid valve 72 is connected to the pickling tank 63. During pickling, the electric valves at the acid inlet and the acid outlet are turned on, and the acid replenishing mechanism 7 supplies hydrochloric acid to the pickling tank 63. The first pH sensor measures the pH value to control the appropriate concentration of hydrochloric acid in the pickling tank 63. The acid circulation pump 64 pumps dilute hydrochloric acid to circulate in the sodium hypochlorite electrolyzer, and the falling solid objects are filtered through the filter during the circulation process.

[0050] In the embodiments provided by the present utility model, it should be understood that the disclosed structure can be implemented in other ways. For example, the structural embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection between each other can be through some interfaces, and the indirect coupling or communication connection of structures or units can be in electrical, mechanical or other forms.

[0051] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0052] In addition, in each embodiment of the present utility model, the functional units can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

[0053] The above are only the specific implementation manners of the present utility model, enabling those skilled in the art to understand or implement the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A device for preparing sodium hypochlorite by electrolyzing seawater, characterized in that: include: A sodium hypochlorite electrolytic cell (1) is provided with an independent liquid inlet and acid inlet, and an independent liquid outlet and acid outlet, wherein the liquid inlet, the acid inlet, the liquid outlet and the acid outlet are provided with electric valves respectively; The sodium hypochlorite electrolytic cell (1) is electrically connected to an electrolytic power source (5); The liquid inlet is connected to the seawater pretreatment mechanism (2) and the water replenishment and flushing mechanism (3); The liquid outlet is connected to the inlet of the first gas-liquid separator (4), and the liquid outlet of the first gas-liquid separator (4) is connected to the sodium hypochlorite storage tank (8); The acid inlet and the acid outlet are connected to a plate cleaning mechanism (6), wherein the plate cleaning mechanism (6) comprises: a second gas-liquid separator (61) connected to the acid outlet, the liquid outlet of the second gas-liquid separator (61) is connected to a filter (62), the filter (62) is connected to the inlet of a pickling tank (63), the outlet of the pickling tank (63) is connected to an acid circulation pump (64), the pickling tank (63) is provided with a sewage outlet, the sewage outlet is provided with a sewage valve (65), and the sewage valve (65) is connected to a wastewater tank via a pipeline; the pickling tank (63) is connected to an acid replenishing mechanism (7), and a first pH sensor is provided in the pickling tank (63).

2. The device for preparing sodium hypochlorite by electrolyzing seawater according to claim 1, characterized in that: The sodium hypochlorite electrolytic cell (1) comprises: a cell body (11), wherein connecting flanges (12) are respectively arranged at both ends of the cell body (11); one of the connecting flanges (12) is fixed with a water outlet flange (13), wherein the water outlet flange (13) is provided with a liquid outlet and an acid outlet connected to the cell body (11), an anode conductive plate (14) is clamped between the connecting flange and the water outlet flange, and the anode conductive plate (14) is provided with an anode joint extending beyond the flange range; the other connecting flange (12) is fixed with a water inlet flange (15), wherein the water inlet flange (15) is provided with a liquid inlet and an acid inlet connected to the cell body (11), a cathode conductive plate (16) is clamped between the connecting flange and the water inlet flange, and the cathode conductive plate (16) is provided with a cathode joint extending beyond the flange range, and insulating sealing rings are respectively arranged on both sides of the anode conductive plate (14) and the cathode conductive plate (16); A plate fixing frame (17) is arranged in the tank body (11), and the plate fixing frame (17) fixes the anode plate (18) and the cathode plate (19) through the plate separation groove, and the anode plate (18) and the cathode plate (19) are arranged alternately, and the anode plate (18) and the cathode plate (19) are connected to the anode conductive plate (14) and the cathode conductive plate (16) respectively.

3. The device for preparing sodium hypochlorite by electrolyzing seawater according to claim 2, characterized in that: The electrode fixing frame (17) comprises: a plurality of electrode separation frames (171), wherein the electrode separation frames (171) comprise a frame and an electrode separation groove arranged inside the frame; the electrode separation frames (171) are connected to a frame body (172), and a plurality of baffles (173) are arranged on the frame body (172).

4. The device for preparing sodium hypochlorite by electrolyzing seawater according to claim 2, characterized in that: The tank body (11) is provided with a second pH sensor, a pressure sensor and a temperature sensor, and the tank body (11) is provided with a window for observing the state of the electrode plate.

5. The device for preparing sodium hypochlorite by electrolyzing seawater according to claim 1, characterized in that: The seawater pretreatment mechanism (2) comprises: a water pump (21), the water pump (21) is connected to a seawater reaction filter (22), and the seawater reaction filter (22) is connected to a salt water storage tank (23); The outlet of the brine storage tank (23) is connected to the inlet of the brine booster pump (24); the outlet of the brine booster pump (24) is connected to a first one-way valve (25), the first one-way valve (25) is connected to the liquid inlet of the sodium hypochlorite electrolytic cell (1) via a pipeline, and the first one-way valve (25) allows brine to flow from the brine booster pump to the liquid inlet of the sodium hypochlorite electrolytic cell (1); The salt water storage tank (23) is provided with a conductivity sensor (26), a stirring mechanism is provided inside the salt water storage tank (23), and a salt adding port is provided in the salt water storage tank (23).

6. The device for preparing sodium hypochlorite by electrolyzing seawater according to claim 1, characterized in that: The water replenishment and flushing mechanism (3) comprises: a water tank (31); a water valve (32) is arranged at the water outlet of the water tank (31); the water valve (32) is connected to a flow regulating valve (33) via a pipeline; a flow meter (34) is provided in the pipeline downstream of the flow regulating valve (33); a second one-way valve (35) is connected downstream of the flow meter (34); the second one-way valve (35) is connected to the liquid inlet of the sodium hypochlorite electrolytic cell (1); and the second one-way valve (35) allows water to flow from the water tank to the liquid inlet of the sodium hypochlorite electrolytic cell (1).

7. The device for preparing sodium hypochlorite by electrolyzing seawater according to claim 1, characterized in that: The acid replenishment mechanism (7) comprises: a hydrochloric acid storage tank (71); an acid replenishment valve (72) is arranged at the outlet of the hydrochloric acid storage tank (71); and the acid replenishment valve (72) is connected to the pickling tank (63).

8. The device for preparing sodium hypochlorite by electrolyzing seawater according to claim 1, characterized in that: A hypochlorite sensor is arranged at the liquid outlet of the sodium hypochlorite electrolytic cell (1); and the electrolysis power supply (5) is provided with a voltage sensor for detecting the electrolysis voltage and a current sensor for detecting the electrolysis current.

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