Electrodialysis equipment

Abstract

The invention discloses electrodialysis equipment, and belongs to the field of water treatment devices. The spraying assembly is matched with the electrodialysis assembly; the hydraulic cylinder is connected with the electrodialysis assembly; an oil tank; one end of the pump body is communicated with the oil tank; the inlet end of the one-way valve is communicated with the other end of the pump body, and the outlet end of the one-way valve is communicated with the hydraulic cylinder; one end of the pressure sensor is communicated with the oil tank, and the other end of the pressure sensor is communicated between the outlet end of the one-way valve and the hydraulic cylinder; one end of the electromagnetic valve is communicated with the oil tank, and the other end of the electromagnetic valve is communicated between the outlet end of the one-way valve and the hydraulic cylinder; and the controller is electrically connected with the pressure sensor and the electromagnetic valve. The invention has the technical effects that the pressure can be automatically controlled conveniently, the pressure is prevented from being too large or too small, and the cleaning performance is good.

Description

Technical Field

[0001] The invention relates to a water treatment device, in particular to an electrodialysis device. Background Art

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

[0003] In order to ensure the sealing, the relevant electrodialysis equipment generally uses hydraulic components to compress the membrane stack. However, during the long-term operation, the pressure of the hydraulic components will gradually decrease, causing the internal and external seals of the membrane stack to gradually fail and need to be re-pressurized. Or when the room temperature and operating temperature are very different in winter, or when the material changes cause the membrane stack to swell, it is easy to cause the locking pressure of the membrane stack to increase and even cause the membrane stack to deform.

[0004] At the same time, the cleaning performance of related electrodialysis equipment is poor, and it is difficult to clean the moist crystals of alkali or salt formed on the surface of the membrane stack in time, which leads to the formation of a conductive circuit between the positive and negative electrodes of the membrane stack, thereby generating heat and causing the membrane stack to burn. Summary of the invention

[0005] Purpose of the invention: The purpose of the present invention is to provide an electrodialysis device, which is not only convenient for realizing automatic pressure control and preventing the pressure from being too high or too low, but also has good cleaning performance.

[0006] Technical solution:

[0007] An electrodialysis device, comprising:

[0008] Electrodialysis components;

[0009] A spray assembly matched with the electrodialysis assembly;

[0010] a 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 an inlet end of the one-way valve is connected to the other end of the pump body, and an 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 to 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 to the outlet of the one-way valve and the hydraulic cylinder;

[0016] A controller 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, wherein the plurality of nozzles are connected around the grid plate and are 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 comprises:

[0019] A nozzle body connected to the grid plate;

[0020] A first hole and a plurality of second holes are all arranged in the nozzle body, one end of the first hole is connected to the plurality of second holes, and the other end of the first hole is connected to the water supply unit;

[0021] Wherein, the nozzle body, the first hole and the plurality of second holes are all located outside the electrodialysis component.

[0022] Optionally, also include:

[0023] A regulating valve connected between 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] Wherein, the regulating valve and the controller are electrically connected.

[0026] Optionally, also include:

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

[0028] an accumulator and an electric contact pressure gauge both connected to the other end of the pressure sensor and the connection point between the outlet end of the one-way valve and the hydraulic cylinder;

[0029] Wherein, the electric contact pressure gauge is electrically connected to the controller.

[0030] Optionally, the electrodialysis assembly comprises:

[0031] Frame;

[0032] A fixed pressure plate fixedly connected to the frame;

[0033] A movable pressure plate 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] Wherein, the cylinder body of the hydraulic cylinder is connected to the frame body, and the piston rod of the hydraulic cylinder is connected to the movable pressure plate.

[0036] Optionally, the membrane stack comprises:

[0037] Positive water distribution board;

[0038] A plurality of ion exchange membranes and a plurality of separators arranged at intervals;

[0039] Negative water distribution board;

[0040] Wherein, the plurality of ion exchange membranes and the plurality of separators arranged at intervals 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 collector electrically connected to the controller, and the DC voltage collector is electrically connected to the positive electrode water distribution board and the negative electrode water distribution board.

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

[0043] Optionally, the pump body comprises:

[0044] Motor;

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

[0046] Among them, 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 is further included, and the one-way valve, the solenoid valve and the 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 the present application facilitates automatic control of the pressure of the automatic hydraulic station through a one-way valve, a pressure sensor, a solenoid valve, and a controller, thereby preventing 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 assembly;

[0051] (2) The spray assembly is used to spray the electrodialysis assembly and has good cleaning performance, which facilitates timely cleaning of moist crystals of alkali or salt formed on the surface of the membrane stack of the electrodialysis assembly, thereby preventing the formation of a conductive circuit between the positive and negative electrodes of the membrane stack, thereby generating heat and causing the membrane stack to burn. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0054] Figure 3 It is a hydraulic connection diagram of the automatic hydraulic station of embodiment 1 of the present invention;

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

[0056] Figure 5 for Figure 4 Partial diagram of C in the middle;

[0057] Figure 6 This is the second structural schematic diagram of the spray assembly and the membrane stack of Example 1 of the present invention;

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

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

[0060] Fig. 9 for Figure 8 Cross-section of the middle BB;

[0061] Fig.10 This is a collection principle diagram of a DC voltage collector according to Embodiment 1 of the present invention;

[0062] In the figure: 1. Electrodialysis assembly; 11. Frame; 12. Fixed pressure plate; 13. Mobile pressure plate; 14. Membrane stack; 141. Positive water distribution plate; 142. Negative water distribution plate; 143. Ion exchange membrane; 144. Partition; 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. Electric contact pressure gauge; 211. Hydraulic oil pipe; 212. DC voltage collector; 213. Distance meter; 214. Hydraulic valve block; 215, hydraulic cylinder; 2151, cylinder body; 2152, piston rod; 3, spray assembly; 31, grille plate; 311, grille hole; 32, water supply unit; 321, water supply module; 3210, third water supply pipe; 3211, first water supply pipe; 3212, three-way pipe one; 3213, elbow pipe one; 3214, second water supply pipe; 3215, three-way pipe two; 3216, first card-free quick connector; 3217, second card-free quick connector; 3218, elbow pipe two; 3219, card-free quick reducer; 33, nozzle; 331, first hole; 332, second hole; 333, nozzle body; 41, communication cable; 42, host computer. DETAILED DESCRIPTION

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

[0064] Example 1

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

[0066] Specifically, during operation, when the pressure sensor 203 detects that the pressure of the automatic hydraulic station 2 is lower than the low point, the pressure sensor 203 transmits the low point pressure signal to the controller 205, and the controller 205 opens the pump body 201 so that the hydraulic oil in the oil tank 200 flows into the hydraulic cylinder 215 through the one-way valve 202, until the pressure sensor 203 detects that the pressure of the automatic hydraulic station 2 rises to the high point, the pressure sensor 203 transmits the high point pressure signal to the controller 205, and the controller 205 closes the pump body 201; when the pressure sensor 203 detects that the pressure of the automatic hydraulic station 2 is higher than the high-high point, the pressure sensor 203 transmits the high-high point pressure signal to the controller 205, and the controller 205 closes the pump body 201. The signal is transmitted to the controller 205, and the controller 205 opens the solenoid valve 204, so that part of the hydraulic oil in the hydraulic cylinder 215 flows 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 drops to a high point, and the controller 205 closes the solenoid valve 204; in summary, the electrodialysis equipment with the automatic hydraulic station 2 of this embodiment facilitates the automatic control of the pressure of the automatic hydraulic station 2 through the one-way valve 202, the pressure sensor 203, the solenoid valve 204 and the controller 205, so as to prevent the pressure of the automatic hydraulic station 2 from being too large or too small, thereby avoiding deformation or sealing failure of the membrane stack 14 of the electrodialysis component 1.

[0067] Among them, the electrodialysis component 1 is used to separate the charged substances from the solution, and specifically can include a membrane stack 14, etc.; the pump body 201 is used to realize the transmission of hydraulic oil; the oil tank 200 is used to store the hydraulic oil, and the capacity of the oil tank 200 is preferably 15L; the one-way valve 202 is used to realize the one-way conduction between the other end of the pump body 201 and the hydraulic cylinder 215, and the one-way valve 202 can be a spring-type one-way valve, a swing-type 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 through the controller 205, so as to facilitate Pressure relief; the controller 205 is used to control the pressure sensor 203 and the solenoid valve 204, and set the low point, high point and high-high point of the pressure, wherein the low point is smaller than the high point and smaller than the high-high point. The controller 205 is preferably a PLC controller or a DCS controller; the oil tank 200, the pump body 201, the pressure sensor 203 and the solenoid valve 204 constitute the automatic hydraulic station 2, and the hydraulic oil is specifically transmitted through the hydraulic oil pipe 211; the spray assembly 3 is used to spray the electrodialysis assembly 1, and has good cleaning performance, which is convenient for timely cleaning of the moist crystals of alkali or salt formed on the surface of the membrane stack 14 of the electrodialysis assembly 1, thereby preventing the formation of a conductive circuit between the positive and negative electrodes of the membrane stack 14 and then generating heat to cause the membrane stack 14 to burn.

[0068] Further, such as Figure 4-Figure 7The 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. 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. The water supply unit 32 and the plurality of nozzles 33 are all located outside the electrodialysis assembly 1.

[0069] Specifically, the grid plate 31 is used as a nozzle supporting component to support a plurality of nozzles 33. Since the grid plate 31 is located in the electrodialysis assembly 1, the grid plate 31 does not occupy additional space, ensuring that the grid plate 31 occupies a small space and is not easy to occupy the installation and maintenance channel of the membrane stack 14 of the electrodialysis assembly 1, thereby avoiding serious impact on the installation and maintenance of the membrane stack 14 of the electrodialysis assembly 1. Specifically, the grid plate 31 can be made of a polyvinyl chloride plate (i.e., a PVC plate) with a thickness of about 20 mm, and a hollow grid hole 311 is carved in the central power-on area to ensure that the solution passes through; a plurality of nozzles 33 are used for spraying. The dry nozzles 33 are connected to the four sides of the grid plate 31 to facilitate the cleaning of the four sides of the membrane stack 14 of the electrodialysis component 1, thereby ensuring comprehensive cleaning and thus thorough cleaning. The number of the plurality of nozzles 33 is not limited, and eighteen are preferably set, and five are preferably set at the left and right ends of the membrane stack 14 of the electrodialysis component 1, and four are preferably set at the upper and lower ends of the membrane stack 14 of the electrodialysis component 1. The plurality of nozzles 33 are preferably about 5 mm higher than the side of the membrane stack 14 of the electrodialysis component 1; the water supply unit 32 is used to supply water to the plurality of nozzles 33, and the water supply unit 32 may specifically include a water supply pipe, a tee pipe, etc.

[0070] Further, such as Figure 5 and Figure 8-Figure 9 The nozzle 33 includes: a nozzle body 333 connected to the grid plate 31; a first hole 331 and a plurality of second holes 332, all of which are arranged in the nozzle body 333, one end of the first hole 331 and the plurality of 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 the plurality of second holes 332 are all located outside the electrodialysis component 1.

[0071] Specifically, during cleaning, water from the water supply unit 32 flows through the first hole 331 and several second holes 332 in sequence, and is finally sprayed to the surroundings of the membrane stack 14 of the electrodialysis component 1, wherein the shape of the nozzle body 333 can be rectangular, cylindrical, etc., preferably rectangular, the shape of the first hole 331 is preferably circular, and several second holes 332 can be interconnected to form a slit with a width of 0.5-2mm. Several second holes 332 can also be spaced to form a circular hole lattice with a diameter of 1-2mm, preferably a circular hole lattice, so as to further ensure the comprehensiveness of cleaning, thereby making the cleaning thorough.

[0072] Further, such as Figure 2 - Figure 3 , and 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 the safety valve 207 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 the safety valve 207 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 can ensure, through the control of the controller 205, that the pressure value will not drop too quickly and cause system instability during the process of the solenoid valve 204 opening to reduce the pressure; 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 automatically opens. The safety valve 207 can be a spring-type safety valve, a lever-type safety valve, etc.

[0074] Further, such as Figure 2 - Figure 3 , and 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, both of which are connected between the other end of the pressure sensor 203 and the connection point between the outlet end of the one-way 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, a 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 specifically set 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] Further, such as Figure 1 The electrodialysis assembly 1 includes: a frame 11; a fixed pressure plate 12 fixedly connected to the frame 11; a mobile pressure plate 13 movably connected to the frame 11; a plurality of membrane stacks 14 movably connected to the frame 11, and the plurality of membrane stacks 14 are located between the fixed pressure plate 12 and the mobile 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 mobile 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 , so that a plurality of membrane stacks 14 are pressed between the movable pressure plate 13 and the fixed pressure plate 12 , thereby ensuring the sealing of the membrane stacks 14 .

[0078] Further, 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 partitions 144 arranged at intervals; and a negative electrode water distribution plate 142; wherein the plurality of ion exchange membranes 143 and the plurality of partitions 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 the DC electric field, and specifically includes an anion membrane and a cationic membrane; the partition 144 is used to separate the anion membrane and the cationic membrane to facilitate the formation of a water flow channel, and plays the role of water distribution and water 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 import and discharge raw water, fresh water and concentrated water.

[0080] Further, such as Figure 2 and Fig.10 , and also includes a DC voltage collector 212 electrically connected to the controller 205, and the DC voltage collector 212 is electrically connected to the positive electrode water distribution plate 141 and the negative electrode water distribution plate 142.

[0081] Specifically, the DC voltage collector 212 is used to detect the DC voltage of multiple membrane stacks 14, and transmit 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 the multiple membrane stacks 14. The controller 205 can also be electrically connected to the relevant host computer 42, so that the DC voltage values ​​of the multiple membrane stacks 14 can be understood on the host computer 42, and the trend charts and data reports of the DC voltage values ​​of the multiple membrane stacks 14 can be understood on the host computer 42, which is convenient for problem tracing and troubleshooting. It is also convenient to generate a water inlet abnormality warning based on the rising speed of the DC voltage value of the membrane stack 14 per unit time through the algorithm in the controller 205 to determine whether it is caused by water inlet abnormality and reduce losses caused by the abnormality. It is also convenient to generate a DC voltage value difference over-limit warning based on the DC voltage values ​​between the multiple membrane stacks 14 through the algorithm in the controller 205 to determine which specific membrane stack 14 has a problem.

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

[0083] Further, such as Figure 2 , and also includes a distance meter 213 electrically connected to the controller 205. Specifically, the distance meter 213 is used to detect the distance between the mobile 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 the technician to check the operation of the electrodialysis device with the automatic hydraulic station 2 of this embodiment, wherein the distance meter 213 is preferably a laser distance meter with an accuracy of 1 mm.

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

[0085] Further, such as Figure 2 , and also includes a hydraulic valve block 214, and the one-way valve 202, the solenoid valve 204 and the pressure sensor 203 are all connected to the hydraulic valve block 214. Specifically, the hydraulic valve block 214 is used to carry the one-way valve 202, the solenoid valve 204 and the pressure sensor 203, etc., so as to increase compactness.

[0086] Specifically, during operation, an electrodialysis device of model BL3T-50-320 is used in a plateau area. The room temperature in winter is low, at 3-10°C. During operation, the incoming material is processed at 27°C. As the electrodialysis device is running, the temperature gradually rises from room temperature to the liquid temperature, and the membrane stack 14 expands, causing the hydraulic pressure to rise. After shutdown, the membrane stack 14 gradually cools down and shrinks, and the hydraulic pressure gradually decreases. After a long period of operation, the membrane stack 14 repeatedly expands and contracts, and then deforms and begins to leak. After the original electrodialysis device is transformed into an electrodialysis device with an automatic hydraulic station 2, the hydraulic pressure is stabilized within ±1% of the set value, ensuring the safe and stable operation of the equipment.

[0087] Further, such as Fig. 9 , the plurality of second holes 332 are all inclined at a first angle α toward the membrane stack 14 of the electrodialysis assembly 1. Specifically, the first angle α facilitates the water from the plurality of second holes 332 to be sprayed toward the membrane stack 14 of the electrodialysis assembly 1, so as to ensure good targeted cleaning. The first angle α can be 15°, 20°, etc., preferably 15°.

[0088] Further, such as Figure 8 The plurality of second holes 332 are configured as two groups of hole units axially symmetrically distributed 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.

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

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

[0091] Specifically, one of the water supply modules 321 supplies water to the nozzles 33 at the left end, part of the upper end and part of the lower end, and the other water supply module 321 supplies water to the nozzles 33 at the right end, another part of the upper end and another part of the lower end; the first water supply pipe 3211 is used to communicate with the relevant water storage device, so as to facilitate the water supply to the nozzles 33. The material of the first water supply pipe 3211 is preferably polyethylene, the diameter of the first water supply pipe 3211 is preferably 9.5 mm, and the water pressure of the relevant water storage device is preferably 1-2 kg / cm 2, so as to facilitate high-speed water flow to flush the wet crystals; the three-way pipe 3212 and the elbow pipe 3213 are used to realize the connection between the first water supply pipe 3211 and the plurality of nozzles 33, and the plurality of nozzles 33 and the three-way pipe 3212 and the elbow pipe 3213 are specifically connected 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 6.5 mm.

[0092] Further, 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 assembly 1, and one end of the second water supply pipe 3214 is connected to the first water supply pipe 3211 through a second tee pipe 3215. Specifically, the other end of the second water supply pipe 3214 is used to be connected to a related water storage device, so as to facilitate the first water supply pipe 3211 and the nozzle 33 to supply water in turn. 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 second tee pipe 3215 is used to connect one end of the second water supply pipe 3214 with the first water supply pipe 3211.

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

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

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

[0096] Specifically, the elbow pipe 3218 facilitates the bending of the first water supply pipe 3211; the card-free quick reducer 3219 facilitates the rapid connection of two water supply pipes of different sizes, that is, indirectly realizes the connection between the first water supply pipe 3211 and the elbow pipe 3213.

[0097] Further, such as Figure 4 - Figure 6 The positive electrode water distribution plate 141 contacts the outermost ion exchange membrane 143 , the negative electrode water distribution plate 142 contacts the outermost separator 144 , and the grid plate 31 is located between adjacent ion exchange membranes 143 and separators 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 specifically includes an anion membrane and a cation membrane; the partition 144 is used to separate the anion membrane and the cation membrane to facilitate the formation of a water flow channel and play a role in water distribution and collection.

[0099] During operation, after the lithium chloride or lithium sulfate from the salt lake is pre-treated and purified, it enters the lithium hydroxide bipolar membrane stack to prepare lithium hydroxide and hydrochloric acid or sulfuric acid. During operation, a small amount of solution will diffuse from the membrane to the surface of the membrane stack 14 of the electrodialysis component 1 or the edge seal is not tight to form a serious leakage, and salt solution will appear on the surface of the membrane stack 14 of the electrodialysis component 1. After evaporation, salt scale will form on the surface of the membrane stack 14 of the electrodialysis component 1. Depending on the situation, the machine can be shut down for 7-30 days, and then the spray component 3 will be opened to spray pure water at a rate of 1-2kg / cm 2 The water is delivered to the first water supply pipe 3211 under pressure, and then distributed to the third water supply pipe 3210, and finally enters the nozzle 33 and sprays at high speed on the surface of the membrane stack 14 of the electrodialysis module 1 to wash away the salt scale on the surface. After a one-year operation 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 only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. An electrodialysis device, characterized in that: include: Electrodialysis component (1); A spray assembly (3) matched with the electrodialysis assembly (1); A hydraulic cylinder (215) connected to the electrodialysis assembly (1); Fuel tank (200); A pump body (201), one end of the pump body (201) being in communication with the oil tank (200); a one-way valve (202), wherein an inlet end of the one-way valve (202) is connected to the other end of the pump body (201), and an outlet end of the one-way valve (202) is connected to the hydraulic cylinder (215); a pressure sensor (203), one end of the pressure sensor (203) being in communication with the oil tank (200), and the other end of the pressure sensor (203) being in communication between the outlet end of the one-way valve (202) and the hydraulic cylinder (215); a solenoid valve (204), one end of the solenoid valve (204) being in communication with the oil tank (200), and the other end of the solenoid valve (204) being in communication with the outlet end of the one-way valve (202) and the hydraulic cylinder (215); A controller (205) is electrically connected to both the pressure sensor (203) and the solenoid valve (204).

2. An electrodialysis device according to claim 1, characterized in that: The spray assembly (3) comprises a grid plate (31), a water supply unit (32) and a plurality of nozzles (33); the plurality of nozzles (33) are connected to the four sides of the grid plate (31); the plurality of nozzles (33) are all in communication with the water supply unit (32); the grid plate (31) is located inside the electrodialysis assembly (1); the water supply unit (32) and the plurality of nozzles (33) are all located outside the electrodialysis assembly (1).

3. An electrodialysis device according to claim 2, characterized in that: The nozzle (33) comprises: a nozzle body (333) connected to the grid plate (31); A first hole (331) and a plurality of second holes (332) are both arranged in the nozzle body (333), one end of the first hole (331) is connected to the plurality of second holes (332), 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 the plurality of second holes (332) are all located outside the electrodialysis component (1).

4. An electrodialysis device according to any one of claims 1 to 3, characterized in that: 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 the safety valve (207) being 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 the safety valve (207) being connected between the regulating valve (206) and the oil tank (200); Wherein, the regulating valve (206) and the controller (205) are electrically connected.

5. An electrodialysis device according to any one of claims 1 to 3, characterized in that: 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) both connected to the other end of the pressure sensor (203) and the connection point between the outlet end of the one-way valve (202) and the hydraulic cylinder (215); Wherein, the electric contact pressure gauge (210) and the controller (205) are electrically connected.

6. An electrodialysis device according to any one of claims 1 to 3, characterized in that: The electrodialysis assembly (1) comprises: Frame (11); A fixed pressure plate (12) fixedly connected to the frame (11); A movable pressure plate (13) 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).

7. An electrodialysis device according to claim 6, characterized in that: The membrane stack (14) comprises: Positive electrode water distribution plate (141); A plurality of ion exchange membranes (143) and a plurality of partitions (144) arranged at intervals; Negative water distribution plate (142); The plurality of ion exchange membranes (143) and the plurality of separators (144) arranged at intervals are located between the positive electrode water distribution plate (141) and the negative electrode water distribution plate (142).

8. An electrodialysis device according to claim 7, characterized in that: It also includes a DC voltage collector (212) electrically connected to the controller (205), and the DC voltage collector (212) is electrically connected to the positive electrode water distribution plate (141) and the negative electrode water distribution plate (142).

9. An electrodialysis device according to claim 6, characterized in that: Also included is a distance meter (213) electrically connected to the controller (205).

10. An electrodialysis device according to any one of claims 1 to 3, characterized in that: It also includes a hydraulic valve block (214), and the one-way valve (202), the solenoid valve (204) and the pressure sensor (203) are all connected to the hydraulic valve block (214).

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