An electrodialysis apparatus

Abstract

The application discloses an electrodialysis equipment, and belongs to the field of water treatment devices, which comprises an electrodialysis assembly, a spraying assembly matched with the electrodialysis assembly, a hydraulic cylinder connected with the electrodialysis assembly, an oil tank, a pump body, one end of the pump body being communicated with the oil tank, a one-way valve, an inlet end of the one-way valve being communicated with the other end of the pump body, an outlet end of the one-way valve being communicated with the hydraulic cylinder, a pressure sensor, one end of the pressure sensor being communicated with the oil tank, the other end of the pressure sensor being communicated between the outlet end of the one-way valve and the hydraulic cylinder, an electromagnetic valve, one end of the electromagnetic valve being communicated with the oil tank, the other end of the electromagnetic valve being communicated between the outlet end of the one-way valve and the hydraulic cylinder, and a controller electrically connected with the pressure sensor and the electromagnetic valve. The technical effect of the application is that the automatic control of pressure is realized, the pressure is prevented from being too large or too small, and the cleaning performance is good.

Description

Technical Field

[0001] This invention relates to water treatment apparatus, and more particularly to an electrodialysis device. Background Technology

[0002] Electrodialysis equipment is a device that separates charged substances from a solution based on electrochemical principles and under the action of a direct current electric field.

[0003] To ensure sealing, electrodialysis equipment typically uses hydraulic components to press the membrane stack. However, during long-term operation, the pressure of the hydraulic components will gradually decrease, causing the seals inside and outside the membrane stack to gradually fail and requiring repressurization. Alternatively, when there is a large difference between the room temperature and the operating temperature in winter, or when changes in materials cause the membrane stack to swell, the membrane stack locking pressure may increase or even cause deformation of the membrane stack.

[0004] Meanwhile, the poor cleaning performance of related electrodialysis equipment makes it difficult to clean the moist crystals of alkali or salt that form on the surface of the membrane stack in a timely manner, which leads to the formation of a conductive circuit between the positive and negative electrodes of the membrane stack, resulting in heat generation and ultimately burning out of the membrane stack. Summary of the Invention

[0005] Purpose of the invention: The purpose of this invention is to provide an electrodialysis device that not only facilitates automatic pressure control to prevent excessive or insufficient pressure, but also has good cleaning performance.

[0006] Technical solution:

[0007] An electrodialysis device, comprising:

[0008] Electrodialysis components;

[0009] A spray assembly that works in conjunction with the electrodialysis assembly;

[0010] Hydraulic cylinder connected to the electrodialysis assembly;

[0011] tank;

[0012] A pump body, one end of which is connected to the oil tank;

[0013] A one-way valve, wherein the inlet end of the one-way valve is connected to the other end of the pump body, and the outlet end of the one-way valve is connected to the hydraulic cylinder;

[0014] A pressure sensor, one end of which is connected to the oil tank, and the other end of which is connected between the outlet of the one-way valve and the hydraulic cylinder;

[0015] A solenoid valve, one end of which is connected to the oil tank, and the other end of which is connected between the outlet end of the check valve and the hydraulic cylinder;

[0016] A controller that is electrically connected to both the pressure sensor and the solenoid valve.

[0017] Optionally, the spray assembly includes a grid plate, a water supply unit, and a plurality of nozzles. The plurality of nozzles are connected around the grid plate and are all connected to the water supply unit. The grid plate is located inside the electrodialysis assembly, and the water supply unit and the plurality of nozzles are located outside the electrodialysis assembly.

[0018] Optionally, the nozzle includes:

[0019] The nozzle body is connected to the grille plate;

[0020] A first hole and several second holes are provided in the nozzle body. One end of the first hole is connected to all of the several second holes, and the other end of the first hole is connected to the water supply unit.

[0021] The nozzle body, the first hole, and several second holes are all located outside the electrodialysis assembly.

[0022] Optional, also includes:

[0023] A regulating valve connecting one end of the solenoid valve and the oil tank;

[0024] A safety valve, one end of which is connected between the inlet end of the one-way valve and the other end of the pump body, and the other end of which is connected between the regulating valve and the oil tank;

[0025] The regulating valve and the controller are electrically connected.

[0026] Optional, also includes:

[0027] A manual pressure relief valve connecting one end of the pressure sensor and the oil tank;

[0028] An accumulator and an electrical contact pressure gauge are connected to the other end of the pressure sensor and the connection between the outlet end of the one-way valve and the hydraulic cylinder.

[0029] The pressure gauge with electrical contacts is electrically connected to the controller.

[0030] Optionally, the electrodialysis assembly includes:

[0031] Frame;

[0032] Fixed pressure plate fixedly connected to the frame;

[0033] The movable pressure plate is movably connected to the frame.

[0034] A plurality of membrane stacks are movably connected to the frame, and the plurality of membrane stacks are located between the fixed pressure plate and the movable pressure plate;

[0035] The cylinder body of the hydraulic cylinder is connected to the frame, and the piston rod of the hydraulic cylinder is connected to the movable pressure plate.

[0036] Optionally, the membrane stack includes:

[0037] Positive electrode water distribution plate;

[0038] Multiple ion exchange membranes and multiple separators are spaced apart;

[0039] Negative electrode water distribution plate;

[0040] The multiple ion exchange membranes and multiple separators that are spaced apart are all located between the positive electrode water distribution plate and the negative electrode water distribution plate.

[0041] Optionally, it also includes a DC voltage acquisition device electrically connected to the controller, wherein the DC voltage acquisition device is electrically connected to both the positive and negative water distribution plates.

[0042] Optionally, a rangefinder electrically connected to the controller may also be included.

[0043] Optionally, the pump body includes:

[0044] Electric motor;

[0045] A plunger pump connected to the drive shaft of the motor;

[0046] One end of the plunger pump is connected to the oil tank, and the other end of the plunger pump is connected to the inlet end of the one-way valve.

[0047] Optionally, a hydraulic valve block may also be included, wherein the check valve, solenoid valve, and pressure sensor are all connected to the hydraulic valve block.

[0048] Optionally, the controller is a PLC controller or a DCS controller.

[0049] Beneficial effects:

[0050] (1) The electrodialysis equipment of this application uses a check valve, pressure sensor, solenoid valve and controller to facilitate automatic control of the pressure of the automatic hydraulic station, prevent the pressure of the automatic hydraulic station from being too high or too low, thereby avoiding deformation or sealing failure of the membrane stack of the electrodialysis module.

[0051] (2) The spray assembly is used to spray the electrodialysis assembly. It has good cleaning performance and can clean the moist crystals of alkali or salt formed on the membrane stack surface of the electrodialysis assembly in a timely manner, thereby preventing the formation of a conductive circuit between the positive and negative electrodes of the membrane stack, which would cause the membrane stack to burn out due to heat. Attached Figure Description

[0052] Figure 1 This is a schematic diagram of the structure of an electrodialysis device according to Embodiment 1 of the present invention;

[0053] Figure 2 This is a schematic diagram of the automatic hydraulic station according to Embodiment 1 of the present invention;

[0054] Figure 3 This is a hydraulic connection diagram of the automatic hydraulic station according to Embodiment 1 of the present invention;

[0055] Figure 4 This is one of the structural schematic diagrams of the spray assembly and membrane stack according to Embodiment 1 of the present invention;

[0056] Figure 5 for Figure 4 A partial view of C;

[0057] Figure 6 This is a second schematic diagram of the spray assembly and membrane stack according to Embodiment 1 of the present invention;

[0058] Figure 7 This is a schematic diagram of the spray assembly structure according to Embodiment 1 of the present invention;

[0059] Figure 8 for Figure 7 Cross-sectional view of AA;

[0060] Figure 9 for Figure 8 Cross-sectional view of BB;

[0061] Figure 10 This is a schematic diagram of the DC voltage acquisition principle of Embodiment 1 of the present invention;

[0062] In the diagram: 1. Electrodialysis module; 11. Frame; 12. Fixed pressure plate; 13. Moving pressure plate; 14. Membrane stack; 141. Positive electrode water distribution plate; 142. Negative electrode water distribution plate; 143. Ion exchange membrane; 144. Separator; 2. Automatic hydraulic station; 200. Oil tank; 201. Pump body; 2011. Motor; 2012. Piston pump; 202. Check valve; 203. Pressure sensor; 204. Solenoid valve; 205. Controller; 206. Regulating valve; 207. Safety valve; 208. Manual pressure relief valve; 209. Accumulator; 210. Electrical contact pressure gauge; 211. Hydraulic oil pipe; 212. DC voltage acquisition unit; 213. Rangefinder; 214. 215. Hydraulic valve block; 2151. Hydraulic cylinder; 2152. Cylinder body; 2152. Piston rod; 3. Spray assembly; 31. Grating plate; 311. Grating hole; 32. Water supply unit; 321. Water supply module; 3210. Third water supply pipe; 3211. First water supply pipe; 3212. T-pipe one; 3213. Elbow pipe one; 3214. Second water supply pipe; 3215. T-pipe two; 3216. First cardless quick connector; 3217. Second cardless quick connector; 3218. Elbow pipe two; 3219. Cardless quick reducer; 33. Nozzle; 331. First hole; 332. Second hole; 333. Nozzle body; 41. Communication cable; 42. Host computer. Detailed Implementation

[0063] To make the technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0064] Example 1

[0065] like Figure 1 - Figure 10 This embodiment provides an electrodialysis device, including: an electrodialysis component 1; a spray component 3 cooperating with the electrodialysis component 1; a hydraulic cylinder 215 connected to the electrodialysis component 1; an oil tank 200; a pump body 201, one end of which is connected to the oil tank 200; a one-way valve 202, the inlet end of which is connected to the other end of the pump body 201, and the outlet end of which is connected to the hydraulic cylinder 215; a pressure sensor 203, one end of which is connected to the oil tank 200, and the other end of which is connected between the outlet end of the one-way valve 202 and the hydraulic cylinder 215; a solenoid valve 204, one end of which is connected to the oil tank 200, and the other end of which is connected between the outlet end of the one-way valve 202 and the hydraulic cylinder 215; and a controller 205 electrically connected to both the pressure sensor 203 and the solenoid valve 204.

[0066] Specifically, during operation, when pressure sensor 203 detects that the pressure of automatic hydraulic station 2 is lower than the low point, pressure sensor 203 transmits the low point pressure signal to controller 205. Controller 205 then opens pump 201, allowing hydraulic oil in oil tank 200 to flow into hydraulic cylinder 215 through check valve 202, until pressure sensor 203 detects that the pressure of automatic hydraulic station 2 has risen to the high point. Pressure sensor 203 then transmits the high point pressure signal to controller 205, and controller 205 shuts down pump 201. When pressure sensor 203 detects that the pressure of automatic hydraulic station 2 is higher than the high point, pressure sensor 203 transmits the high point pressure signal to controller 205. The signal is transmitted to the controller 205, which opens the solenoid valve 204, allowing some of the hydraulic oil in the hydraulic cylinder 215 to flow into the oil tank 200 through the solenoid valve 204 until the pressure sensor 203 detects that the pressure of the automatic hydraulic station 2 has dropped to a high point, at which point the controller 205 closes the solenoid valve 204. In summary, the electrodialysis equipment with the automatic hydraulic station 2 in this embodiment facilitates automatic control of the pressure of the automatic hydraulic station 2 through the check valve 202, pressure sensor 203, solenoid valve 204, and controller 205, preventing the pressure of the automatic hydraulic station 2 from being too high or too low, thereby avoiding deformation or sealing failure of the membrane stack 14 of the electrodialysis component 1.

[0067] The electrodialysis component 1 is used to separate charged substances from the solution, and may specifically include a membrane stack 14, etc.; the pump body 201 is used to transfer hydraulic oil; the oil tank 200 is used to store hydraulic oil, and the capacity of the oil tank 200 is preferably 15L; the one-way valve 202 is used to achieve one-way communication between the other end of the pump body 201 and the hydraulic cylinder 215, and the one-way valve 202 can be a spring-loaded one-way valve, a swing one-way valve, etc.; the pressure sensor 203 is used to detect the pressure of the automatic hydraulic station 2 and transmit the pressure signal to the controller 205, and the pressure sensor 203 can be a piezoresistive pressure sensor, a capacitive pressure sensor, etc.; the solenoid valve 204 is used to control the opening and closing of the solenoid valve through the controller 205, which facilitates... Pressure relief; Controller 205 is used to control pressure sensor 203 and solenoid valve 204, and to set the low point, high point and high-high point of pressure, wherein the low point is lower than the high point and the high-high point is lower than the high-high point. Controller 205 is preferably a PLC controller or DCS controller; Oil tank 200, pump body 201, pressure sensor 203 and solenoid valve 204, etc., constitute automatic hydraulic station 2, and hydraulic oil is specifically transmitted through hydraulic oil pipe 211; Spray assembly 3 is used to spray water onto electrodialysis assembly 1, and has good cleaning performance, which facilitates timely cleaning of the moist crystals of alkali or salt formed on the surface of membrane stack 14 of electrodialysis assembly 1, thereby preventing the formation of a conductive circuit between the positive and negative electrodes of membrane stack 14, which would cause heat generation and lead to burnout of membrane stack 14.

[0068] Furthermore, such as Figures 4-7The spray assembly 3 includes a grid plate 31, a water supply unit 32, and several nozzles 33. The several nozzles 33 are connected around the grid plate 31 and are all connected to the water supply unit 32. The grid plate 31 is located inside the electrodialysis assembly 1, and the water supply unit 32 and several nozzles 33 are located outside the electrodialysis assembly 1.

[0069] Specifically, the grid plate 31 serves as a nozzle support component, supporting several nozzles 33. Since the grid plate 31 is located within the electrodialysis assembly 1, it does not occupy additional space, ensuring minimal space usage and minimizing obstruction of the installation and maintenance channels of the membrane stack 14 in the electrodialysis assembly 1, thus avoiding serious impact on the installation and maintenance of the membrane stack 14. Specifically, the grid plate 31 can be made of polyvinyl chloride (PVC) board with a thickness of approximately 20mm, with perforated grid holes 311 carved in the central electrified area to ensure solution passage. Several nozzles 33 are used for spraying. Dry nozzles 33 are connected around the grid plate 31 to facilitate cleaning around the membrane stack 14 of the electrodialysis component 1, ensuring thorough cleaning. The number of nozzles 33 is not limited, but eighteen are preferred. Five nozzles are preferably set at the left and right ends of the membrane stack 14 of the electrodialysis component 1, and four nozzles are preferably set at the top and bottom ends of the membrane stack 14 of the electrodialysis component 1. The nozzles 33 are preferably about 5 mm above the side of the membrane stack 14 of the electrodialysis component 1. Water supply unit 32 is used to supply water to the nozzles 33. The water supply unit 32 may specifically include water supply pipe, tee pipe, etc.

[0070] Furthermore, such as Figure 5 and Figures 8-9 The nozzle 33 includes: a nozzle body 333 connected to the grid plate 31; a first hole 331 and several second holes 332 all disposed in the nozzle body 333, one end of the first hole 331 and several second holes 332 are connected, and the other end of the first hole 331 is connected to the water supply unit 32; wherein, the nozzle body 333, the first hole 331 and several second holes 332 are all located outside the electrodialysis component 1.

[0071] Specifically, during cleaning, water from the water supply unit 32 flows sequentially through the first hole 331 and several second holes 332, and is finally sprayed around the membrane stack 14 of the electrodialysis component 1. The nozzle body 333 can be rectangular, cylindrical, or other shapes, preferably rectangular. The first hole 331 is preferably circular. Several second holes 332 can be interconnected to form a slit with a width of 0.5-2 mm. Several second holes 332 can also be spaced apart to form a circular hole array with a diameter of 1-2 mm, preferably a circular hole array, to further ensure good cleaning coverage and thus good cleaning thoroughness.

[0072] Furthermore, such as Figure 2 - Figure 3 It also includes: a regulating valve 206 connected between one end of the solenoid valve 204 and the oil tank 200; a safety valve 207, one end of which is connected between the inlet end of the check valve 202 and the other end of the pump body 201, and the other end of which is connected between the regulating valve 206 and the oil tank 200; wherein the regulating valve 206 and the controller 205 are electrically connected.

[0073] Specifically, the regulating valve 206, controlled by the controller 205, ensures that the pressure value will not drop too quickly and cause system instability during the opening and depressurization process of the solenoid valve 204; the safety valve 207 is used to increase safety. When the pressure of the automatic hydraulic station 2 exceeds the safety pressure, the safety valve 207 will open automatically. The safety valve 207 can be a spring-loaded safety valve, a lever-type safety valve, etc.

[0074] Furthermore, such as Figure 2 - Figure 3 It also includes: a manual pressure relief valve 208 connected between one end of the pressure sensor 203 and the oil tank 200; an accumulator 209 and an electric contact pressure gauge 210 connected between the other end of the pressure sensor 203 and the connection between the outlet end of the check valve 202 and the hydraulic cylinder 215; wherein the electric contact pressure gauge 210 and the controller 205 are electrically connected.

[0075] Specifically, the manual pressure relief valve 208 is used for manual pressure relief to further ensure safety. The manual pressure relief valve 208 can be a butterfly valve, ball valve, etc.; the accumulator 209 is used as a buffer device to reduce the peak and valley values ​​of the pressure of the automatic hydraulic station 2 and improve the stability of the automatic hydraulic station 2. The capacity of the accumulator 209 is preferably 1.25L; the electric contact pressure gauge 210 can be set with two protection points and display the current pressure of the automatic hydraulic station 2. When the pressure of the automatic hydraulic station 2 is not within the range of these two points, an alarm signal can be transmitted to the controller 205.

[0076] Furthermore, such as Figure 1 The electrodialysis assembly 1 includes: a frame 11; a fixed pressure plate 12 fixedly connected to the frame 11; a movable pressure plate 13 movably connected to the frame 11; and a plurality of membrane stacks 14, all movably connected to the frame 11, with the plurality of membrane stacks 14 located between the fixed pressure plate 12 and the movable pressure plate 13; wherein, the cylinder body 2151 of the hydraulic cylinder 215 is connected to the frame 11, and the piston rod 2152 of the hydraulic cylinder 215 is connected to the movable pressure plate 13.

[0077] Specifically, during operation, the piston rod 2152 of the hydraulic cylinder 215 drives the movable pressure plate 13 to move along the frame 11, thereby pressing several membrane stacks 14 between the movable pressure plate 13 and the fixed pressure plate 12 to ensure the sealing of the membrane stacks 14.

[0078] Furthermore, such as Figure 1 The membrane stack 14 includes: a positive electrode water distribution plate 141; a plurality of ion exchange membranes 143 and a plurality of separators 144 arranged at intervals; and a negative electrode water distribution plate 142; wherein the plurality of ion exchange membranes 143 and the plurality of separators 144 arranged at intervals are all located between the positive electrode water distribution plate 141 and the negative electrode water distribution plate 142.

[0079] Specifically, the ion exchange membrane 143 is used to separate charged substances from the solution under the action of a DC electric field, and includes anion exchange membrane and cation exchange membrane; the separator 144 is used to separate the anion exchange membrane and cation exchange membrane, which facilitates the formation of water flow channels and plays the role of water distribution and collection; the positive electrode water distribution plate 141 and the negative electrode water distribution plate 142 are used together to supply DC power, and at the same time introduce and discharge raw water, fresh water and concentrated water.

[0080] Furthermore, such as Figure 2 and Figure 10 It also includes a DC voltage acquisition unit 212 that is electrically connected to the controller 205. The DC voltage acquisition unit 212 is electrically connected to the positive water distribution plate 141 and the negative water distribution plate 142.

[0081] Specifically, the DC voltage acquisition unit 212 is used to detect the DC voltage of multiple membrane stacks 14, and transmits the DC voltage values ​​of multiple membrane stacks 14 to the controller 205 via the communication cable 41 using the Mobbus RTU communication protocol. The controller 205 further analyzes and processes the DC voltage values ​​of multiple membrane stacks 14. The controller 205 can also be electrically connected to a relevant host computer 42, which facilitates the understanding of the DC voltage values ​​of multiple membrane stacks 14 on the host computer 42. It also facilitates the understanding of trend graphs and data reports of the DC voltage values ​​of multiple membrane stacks 14 on the host computer 42, which is convenient for problem tracing and fault diagnosis. Furthermore, it facilitates the generation of water ingress anomaly warnings based on the rise rate of the DC voltage value of the membrane stacks 14 per unit time using the algorithm within the controller 205, which determines whether the problem is caused by water ingress anomalies and reduces losses caused by anomalies. It also facilitates the generation of DC voltage value difference over-limit warnings based on the comparison of the DC voltage values ​​of multiple membrane stacks 14 using the algorithm within the controller 205, which determines which membrane stack 14 is causing the problem.

[0082] When the controller 205 is a PLC controller, a DC voltage acquisition device 212 is installed in the PLC controller cabinet. The output terminal of the DC voltage acquisition device 212 is connected to the Modbus RTU PLC communication module in the PLC controller cabinet through the communication cable 41. The input terminal of the DC voltage acquisition device 212 is connected to the voltage detection points on both sides of multiple membrane stacks 14 through a multi-core shielded wire. The PLC controller is programmed according to the communication protocol of the DC voltage acquisition device 212, reads the voltage data of the DC voltage acquisition device 212, sets the early warning algorithm in the PLC controller program, sets the corresponding configuration in the upper computer 42 screen, and finally completes the display and early warning of the DC voltage values ​​of multiple membrane stacks 14.

[0083] Furthermore, such as Figure 2 It also includes a rangefinder 213 electrically connected to the controller 205. Specifically, the rangefinder 213 is used to detect the distance between the moving pressure plate 13 and the fixed pressure plate 12 and transmit it to the controller 205. When the distance value changes abnormally, an alarm is issued to remind technicians to check the operation of the electrodialysis equipment with automatic hydraulic station 2 in this embodiment. The rangefinder 213 is preferably a laser rangefinder with an accuracy of 1 mm.

[0084] Furthermore, such as Figure 2 - Figure 3 The pump body 201 includes: a motor 2011; and a plunger pump 2012 connected to the drive shaft of the motor 2011. One end of the plunger pump 2012 is connected to the oil tank 200, and the other end is connected to the inlet end of the check valve 202. Specifically, the drive shaft of the motor 2011 drives the plunger pump 2012; the plunger pump 2012 is used to transmit hydraulic oil.

[0085] Furthermore, such as Figure 2 It also includes a hydraulic valve block 214, to which a check valve 202, a solenoid valve 204, and a pressure sensor 203 are all connected. Specifically, the hydraulic valve block 214 is used to support the check valve 202, the solenoid valve 204, and the pressure sensor 203, etc., to increase compactness.

[0086] Specifically, during operation, a BL3T-50-320 electrodialysis unit, used in a high-altitude region, faces limitations due to low winter temperatures (3-10℃). The incoming material is at 27℃. As the unit operates, the temperature gradually rises from room temperature to the feed solution temperature, causing the membrane stack 14 to expand and increase hydraulic pressure. After shutdown, the membrane stack 14 gradually cools and contracts, reducing hydraulic pressure. After prolonged operation, the repeated expansion and contraction of the membrane stack 14 leads to deformation and subsequent leakage. After modifying the existing electrodialysis unit to one with an automatic hydraulic station 2, the hydraulic pressure stabilizes within ±1% of the set value, ensuring safe and stable operation.

[0087] Furthermore, such as Figure 9 Each of the second holes 332 is inclined at a first angle α toward the membrane stack 14 of the electrodialysis module 1. Specifically, the first angle α makes it easier for water from the second holes 332 to be sprayed onto the membrane stack 14 of the electrodialysis module 1, so as to ensure good cleaning targeting. The first angle α can be 15°, 20°, etc., preferably 15°.

[0088] Furthermore, such as Figure 8 A number of second holes 332 are configured as two sets of hole units that are axially symmetrical about the nozzle body 333. The spacing d between adjacent second holes 332 of the hole unit is equal, and the second holes 332 on both sides of the hole unit are tilted outward at a second angle β.

[0089] Specifically, the two sets of orifice units facilitate spraying to both sides of a single nozzle body 333, thereby ensuring thorough cleaning. Each orifice unit preferably includes 3-5 second holes 332. Since the spacing d between adjacent second holes 332 of the orifice unit is equal, it facilitates good spray uniformity. The specific value of the spacing d is preferably about 2mm. Since the second holes 332 on both sides of the orifice unit are inclined outward at a second angle β, it facilitates increasing the spray range, thereby facilitating thorough cleaning. When each orifice unit includes 3 second holes 332, the second angle β is preferably 30°.

[0090] Furthermore, such as Figure 7 The water supply unit 32 includes two water supply modules 321. Each water supply module 321 includes a first water supply pipe 3211. The first water supply pipe 3211 extends from the left or right end of the membrane stack 14 of the electrodialysis component 1 to the upper and lower ends of the membrane stack 14 of the electrodialysis component 1, respectively. The first water supply pipe 3211 and several nozzles 33 are connected by a tee pipe 3212 or an elbow pipe 3213.

[0091] Specifically, one water supply module 321 supplies water to the nozzles 33 at the left end, part of the upper end, and part of the lower end, while the other water supply module 321 supplies water to the nozzles 33 at the right end, part of the upper end, and part of the lower end. A first water supply pipe 3211 is used to connect to a related water storage device, thereby facilitating water supply to the nozzles 33. The first water supply pipe 3211 is preferably made of polyethylene, and its diameter is preferably 9.5 mm. The water pressure of the related water storage device is preferably 1-2 kg / cm². 2This facilitates the high-speed water flow to flush away the damp crystals; the tee pipe 3212 and the elbow pipe 3213 are used to connect the first water supply pipe 3211 and several nozzles 33, and the several nozzles 33 are specifically connected to the tee pipe 3212 and the elbow pipe 3213 through the third water supply pipe 3210. The material of the third water supply pipe 3210 is preferably polyethylene, and the diameter of the third water supply pipe 3210 is preferably 6.5mm.

[0092] Furthermore, such as Figure 7 The water supply module 321 also includes a second water supply pipe 3214 located at the left or right end of the membrane stack 14 of the electrodialysis component 1. One end of the second water supply pipe 3214 is connected to the first water supply pipe 3211 via a tee pipe 3215. Specifically, the other end of the second water supply pipe 3214 is used to connect to a related water storage device, thereby facilitating the sequential supply of water to the first water supply pipe 3211 and the nozzle 33. The material of the second water supply pipe 3214 is preferably polyethylene, and the diameter of the second water supply pipe 3214 is preferably 9.5 mm. The tee pipe 3215 is used to connect one end of the second water supply pipe 3214 to the first water supply pipe 3211.

[0093] Furthermore, such as Figure 7 The water supply module 321 also includes: a first cardless quick connector 3216, one end of which is threadedly connected to the nozzle 33, and the other end of which is connected to the tee pipe 3212; and a second cardless quick connector 3217, one end of which is connected to the other end of the second water supply pipe 3214.

[0094] Specifically, the first cardless quick connector 3216 facilitates the connection between the nozzle 33 and the three-way pipe 3212, and the connection speed is fast; the second cardless quick connector 3217 facilitates the connection between the other end of the second water supply pipe 3214 and the relevant water storage device, and the connection speed is fast.

[0095] Furthermore, such as Figure 7 The water supply module 321 also includes: a second elbow pipe 3218, through which the first water supply pipe 3211 extends from the left or right end of the membrane stack 14 of the electrodialysis component 1 to the upper and lower ends of the membrane stack 14 of the electrodialysis component 1 respectively via the two elbow pipes 3218; and a cardless quick-change connector 3219, through which the first water supply pipe 3211 and the first elbow pipe 3213 are connected.

[0096] Specifically, elbow 3218 facilitates bending of the first water supply pipe 3211; quick-connect coupling 3219 facilitates quick connection of two water supply pipes of different sizes, that is, indirectly connects the first water supply pipe 3211 and elbow 3213.

[0097] Furthermore, such as Figure 4 - Figure 6 The positive electrode water distribution plate 141 is in contact with the outermost ion exchange membrane 143, the negative electrode water distribution plate 142 is in contact with the outermost partition plate 144, and the grid plate 31 is located between the adjacent ion exchange membrane 143 and partition plate 144.

[0098] Specifically, the ion exchange membrane 143 is used to separate charged substances from the solution under the action of a DC electric field, and includes anion exchange membrane and cation exchange membrane; the separator 144 is used to separate the anion exchange membrane and cation exchange membrane, so as to facilitate the formation of water flow channels and play the role of water distribution and collection.

[0099] During operation, after pretreatment and purification, lithium chloride or lithium sulfate from the brine lake enters the bipolar membrane stack for lithium hydroxide preparation, producing lithium hydroxide and hydrochloric acid or sulfuric acid. During operation, minute amounts of solution may diffuse from the membrane to the surface of the membrane stack 14 of the electrodialysis module 1, or a significant leak may occur due to inadequate sealing at the edges. In such cases, salt solution will appear on the surface of the membrane stack 14 of the electrodialysis module 1. After evaporation, salt scale will form on the surface of the membrane stack 14 of the electrodialysis module 1. The system can be shut down every 7-30 days as needed, and then the spray assembly 3 can be turned on to spray pure water at a rate of 1-2 kg / cm³. 2 The pressure is transmitted to the first water supply pipe 3211, then distributed to the third water supply pipe 3210, and finally enters the nozzle 33 to be sprayed at high speed onto the surface of the membrane stack 14 of the electrodialysis module 1, washing away the surface salt scale. After a one-year operating cycle, the surface of the membrane stack 14 of the electrodialysis module 1 is clean and free of salt scale, and the self-cleaning device is effective.

[0100] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. An electrodialysis device, characterized in that, include: Electrodialysis module (1); A spray assembly (3) that works in conjunction with the electrodialysis assembly (1); Hydraulic cylinder (215) connected to the electrodialysis assembly (1); Fuel tank (200); Pump body (201), one end of which is connected to the oil tank (200); A one-way valve (202) is provided, with its inlet end connected to the other end of the pump body (201) and its outlet end connected to the hydraulic cylinder (215). A pressure sensor (203) is provided, one end of which is connected to the oil tank (200), and the other end of which is connected between the outlet end of the one-way valve (202) and the hydraulic cylinder (215). Solenoid valve (204), one end of which is connected to the oil tank (200), and the other end of which is connected between the outlet end of the check valve (202) and the hydraulic cylinder (215); A controller (205) electrically connected to both the pressure sensor (203) and the solenoid valve (204); The electrodialysis assembly (1) includes: Frame (11); A fixed pressure plate (12) is fixedly connected to the frame (11); A movable pressure plate (13) is movably connected to the frame (11); A plurality of membrane stacks (14) are movably connected to the frame (11), and the plurality of membrane stacks (14) are located between the fixed pressure plate (12) and the movable pressure plate (13); The cylinder body (2151) of the hydraulic cylinder (215) is connected to the frame (11), and the piston rod (2152) of the hydraulic cylinder (215) is connected to the movable pressure plate (13). The spray assembly (3) includes a grid plate (31), a water supply unit (32), and a plurality of nozzles (33). The plurality of nozzles (33) are connected around the grid plate (31), and the plurality of nozzles (33) are all connected to the water supply unit (32). The grid plate (31) is located inside the electrodialysis assembly (1), and the water supply unit (32) and the plurality of nozzles (33) are located outside the electrodialysis assembly (1). The nozzle (33) includes: a nozzle body (333) connected to the grid plate (31); A first hole (331) and several second holes (332) are provided in the nozzle body (333). One end of the first hole (331) is connected to the several second holes (332), and the other end of the first hole (331) is connected to the water supply unit (32). The nozzle body (333), the first hole (331), and several second holes (332) are all located outside the electrodialysis assembly (1); A plurality of second holes (332) are inclined at a first angle α toward the membrane stack (14) of the electrodialysis assembly (1); the plurality of second holes (332) are configured as two sets of hole units that are axially symmetrical about the nozzle body (333), the spacing d between adjacent second holes (332) of the hole unit is equal, and the second holes (332) on both sides of the hole unit are inclined outward at a second angle β; a rangefinder (213) electrically connected to the controller (205) is also included, the rangefinder (213) is used to detect the distance between the moving pressure plate (13) and the fixed pressure plate (12) and transmit it to the controller (205). It also includes: a regulating valve (206) connected between one end of the solenoid valve (204) and the oil tank (200); Safety valve (207), one end of which is connected between the inlet end of the one-way valve (202) and the other end of the pump body (201), and the other end of which is connected between the regulating valve (206) and the oil tank (200); The regulating valve (206) and the controller (205) are electrically connected.

2. The electrodialysis equipment according to claim 1, characterized in that, Also includes: A manual pressure relief valve (208) is connected between one end of the pressure sensor (203) and the oil tank (200); The accumulator (209) and the electric contact pressure gauge (210) are connected to the other end of the pressure sensor (203) and the connection between the outlet end of the one-way valve (202) and the hydraulic cylinder (215); The pressure gauge (210) and the controller (205) are electrically connected.

3. The electrodialysis equipment according to claim 2, characterized in that, The membrane stack (14) includes: Positive electrode water distribution plate (141); Multiple ion exchange membranes (143) and multiple separators (144) are spaced apart; Negative electrode water distribution plate (142); The multiple ion exchange membranes (143) and multiple separators (144) arranged at intervals are located between the positive electrode water distribution plate (141) and the negative electrode water distribution plate (142).

4. The electrodialysis equipment according to claim 3, characterized in that, It also includes a DC voltage acquisition unit (212) electrically connected to the controller (205), and the DC voltage acquisition unit (212) is electrically connected to the positive water distribution plate (141) and the negative water distribution plate (142).

5. The electrodialysis equipment according to claim 1, characterized in that, It also includes a hydraulic valve block (214), and the check valve (202), solenoid valve (204) and pressure sensor (203) are all connected to the hydraulic valve block (214).

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