Electrodialysis system, control method, and electronic device

Abstract

The application provides an electrodialysis system, a control method and an electronic device. The control method comprises the following steps: detecting the running state of an electrodialysis membrane stack in real time, wherein the running state comprises a normal state and a blockage state; and switching the working mode of the electrodialysis membrane stack according to the running state, wherein the working mode comprises a first working mode and a second working mode, the first working mode is that the concentrated water chamber of the electrodialysis membrane stack is communicated with a concentrated water tank, and the fresh water chamber of the electrodialysis membrane stack is communicated with a fresh water tank, and the second working mode is that the fresh water tank is communicated with the fresh water chamber and the concentrated water chamber respectively. The application realizes online automatic cleaning during the running process of the electrodialysis membrane stack, effectively reduces the blockage phenomenon of the electrodialysis system, maintains the solute concentration of the circulating feed liquid of the concentrated water, and avoids the problem of reduced concentration effect of the concentrated water caused by the return of the cleaning feed liquid to the concentrated water.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, and in particular to an electrodialysis system, control method, and electronic equipment. Background Technology

[0002] The method of separating different solute particles (such as ions) using the selective permeability of a semi-permeable membrane is called dialysis. Electrodialysis is the phenomenon where charged solute particles (such as ions) in a solution migrate through the membrane under the influence of an electric field. Existing electrodialysis systems include an electrodialysis membrane stack, a desalination tank, a concentrate tank, and an electrode tank. The electrodialysis membrane stack includes a desalination chamber, a concentrate chamber, and an electrode tank. The desalination tank is connected to the desalination chamber via piping, the concentrate chamber is connected to the concentrate chamber via piping, and the electrode tank is connected to the electrode tank via piping. This allows desalination water to enter the desalination chamber for desalination, and then flow out of the electrodialysis membrane stack and recirculate back to the desalination tank. Concentrate water enters the concentrate chamber for concentration, and then flows out of the electrodialysis membrane stack and recirculate back to the concentrate tank. Electrode water enters the electrode tank where an electrode reaction occurs, and then flows out of the electrodialysis membrane stack and recirculate back to the electrode tank.

[0003] However, electrodialysis systems are prone to clogging during operation, leading to decreased current efficiency and increased resistance. There are two main methods for cleaning electrodialysis systems: the first method is to disassemble the electrodialysis membrane stack for cleaning; the second method is to control the periodic switching of the flow direction inside the electrodialysis membrane stack to clean it, such as patent publication number CN212174545U, entitled "Electrodialysis Device".

[0004] During the development of the invention, the inventors discovered the following drawbacks in existing methods for cleaning electrodialysis systems: 1) The first method requires frequent disassembly of the electrodialysis membrane stack, which can easily cause instability in the operation of the electrodialysis system, increase the workload of the staff, and the cleaning solution can easily return to the concentrate chamber, reducing the concentrate concentration effect; 2) The second method, when the electrodialysis system is operating under conditions of high current density and ultra-high salt concentration, cannot completely prevent the accumulation and blockage of particles in the electrodialysis membrane stack by relying solely on periodic flow direction switching. It still requires certain cleaning operations to restore the membrane stack performance, and the cleaning solution can also return to the concentrate chamber, reducing the concentrate concentration effect. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an electrodialysis system, control method and electronic equipment.

[0006] The present invention provides a control method for an electrodialysis system, comprising:

[0007] The operating status of the electrodialysis membrane stack is monitored in real time, including normal status and blockage status;

[0008] The operating mode of the electrodialysis membrane stack is switched according to the operating status. The operating mode includes a first operating mode and a second operating mode. In the first operating mode, the concentrate chamber of the electrodialysis membrane stack is connected to the concentrate tank, and the desalination chamber of the electrodialysis membrane stack is connected to the desalination tank. In the second operating mode, the desalination tank is connected to both the desalination chamber and the concentrate chamber.

[0009] Preferably, switching the operating mode of the electrodialysis membrane stack according to the operating status includes:

[0010] If the operating state is the normal state, the operating mode is controlled to be the first operating mode;

[0011] If the operating state is the blocked state, the operating mode is controlled to the second operating mode.

[0012] Furthermore, if the operating state is the blocked state, controlling the operating mode to the second operating mode includes:

[0013] If the operating state is the blocked state, the operating mode is switched to the first operating mode according to the preset working cycle.

[0014] Preferably, the preset working cycle is determined by the following method:

[0015] Inject concentrated feed solution into the concentrated feed tank and record the initial feed solution level in the concentrated feed tank;

[0016] Start the circulation pump, and record the target liquid level in the concentrate tank after the concentrate tank stabilizes.

[0017] The concentrate chamber level is calculated based on the initial feed liquid level and the target feed liquid level.

[0018] Obtain the membrane stack size parameters of the electrodialysis membrane stack;

[0019] The concentrate circulation flow rate is calculated based on the membrane stack size parameters and the preset circulation flow rate.

[0020] The preset working cycle is calculated based on the liquid level in the chamber and the concentrated water circulation flow rate.

[0021] Furthermore, the step of switching the operating mode of the electrodialysis membrane stack according to the operating status includes:

[0022] If the operating state changes from the normal state to the blocked state, the working mode is switched to the second working mode according to the first preset delay time.

[0023] If the operating state changes from the blocked state to the normal state, the operating mode is switched to the first operating mode according to the second preset delay time.

[0024] Furthermore, the real-time monitoring of the operating status of the electrodialysis membrane stack includes:

[0025] Real-time detection of the real-time inlet pressure of the concentrate chamber and / or the real-time outlet pressure of the concentrate chamber.

[0026] Obtain the initial inlet pressure of the inlet port of the concentrate chamber and / or the initial outlet pressure of the outlet port of the concentrate chamber;

[0027] The operating status of the electrodialysis membrane stack is determined based on the real-time inlet pressure and / or the real-time outlet pressure, as well as the initial inlet pressure and / or the initial outlet pressure.

[0028] Furthermore, determining the operating status of the electrodialysis membrane stack based on the real-time influent pressure and / or the real-time effluent pressure, and the initial influent pressure and / or the initial effluent pressure, includes:

[0029] If the difference between the real-time inlet pressure and the initial inlet pressure is greater than or equal to a preset first pressure threshold, the operating state is determined to be the blockage state.

[0030] Furthermore, determining the operating status of the electrodialysis membrane stack based on the real-time influent pressure and / or the real-time effluent pressure, and the initial influent pressure and / or the initial effluent pressure, includes:

[0031] Calculate the initial pressure difference between the initial inlet pressure and the initial outlet pressure;

[0032] Calculate the real-time pressure difference between the real-time inlet pressure and the real-time outlet pressure;

[0033] If the difference between the real-time differential pressure value and the initial differential pressure value is greater than or equal to a preset second pressure threshold, the operating state is determined to be the blockage state.

[0034] The present invention also provides an electrodialysis system, including an electrodialysis membrane stack, a desalination tank, a concentrate tank, an electrode water tank, and a controller. The electrodialysis membrane stack includes a desalination chamber, a concentrate chamber, a first electrode water chamber, and a second electrode water chamber. The desalination tank is connected to the electrodialysis membrane stack via a first piping assembly. The concentrate tank is connected to the electrodialysis membrane stack via a second piping assembly. The electrode water tank is connected to both the first electrode water chamber and the second electrode water chamber via a third piping assembly. The controller is used to control the operating mode of the electrodialysis membrane stack using the electrodialysis system control method described above.

[0035] Furthermore, the first pipeline assembly includes a first inlet pipeline, a second inlet pipeline, a first outlet pipeline, and a second outlet pipeline; the second pipeline assembly includes a third inlet pipeline and a third outlet pipeline. The first inlet pipeline is equipped with a first inlet valve communicatively connected to the controller; the second inlet pipeline is equipped with a second inlet valve communicatively connected to the controller; the first outlet pipeline is equipped with a first outlet valve communicatively connected to the controller; the second outlet pipeline is equipped with a second outlet valve communicatively connected to the controller; the third inlet pipeline is equipped with a third inlet valve communicatively connected to the controller; and the third outlet pipeline is equipped with a third outlet valve communicatively connected to the controller.

[0036] The outlet port of the freshwater tank is connected to the inlet port of the freshwater chamber through the first inlet pipe and the first inlet valve, and the outlet port of the freshwater chamber is connected to the inlet port of the freshwater tank through the first outlet pipe and the first outlet valve.

[0037] The outlet port of the freshwater tank is connected to the inlet port of the concentrated water chamber through the second inlet pipe and the second inlet valve, and the outlet port of the concentrated water chamber is connected to the inlet port of the freshwater tank through the second outlet pipe and the second outlet valve.

[0038] The outlet port of the concentrate tank is connected to the concentrate chamber through the third inlet pipe and the third inlet valve, and the outlet port of the concentrate chamber is connected to the inlet port of the concentrate tank through the third outlet pipe and the third outlet valve.

[0039] Furthermore, the inlet port of the concentrate chamber is equipped with a first inlet pressure sensor, and the outlet port of the concentrate chamber is equipped with a first outlet pressure sensor.

[0040] Preferably, the inlet port of the freshwater chamber is equipped with a second inlet pressure sensor, and the outlet port of the freshwater chamber is equipped with a second outlet pressure sensor.

[0041] Preferably, the system further includes a freshwater circulation pump, a concentrate circulation pump, and an electrode water circulation pump. The freshwater circulation pump is located between the freshwater tank and the freshwater chamber, the concentrate circulation pump is located between the concentrate tank and the concentrate chamber, and the electrode water circulation pump is located between the electrode water tank and the electrode water chamber.

[0042] The present invention also provides an electronic device for a control method of an electrodialysis system, characterized in that it comprises:

[0043] At least one processor; and,

[0044] A memory communicatively connected to the at least one processor; wherein,

[0045] The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the electrodialysis system control method as described above.

[0046] The above technical solution has the following beneficial effects: By real-time monitoring of the operating status of the electrodialysis membrane stack, the working mode of the electrodialysis membrane stack is switched according to the operating status. If the operating status is blocked, the concentrate chamber of the electrodialysis membrane stack is connected to the desalination tank. The concentrate chamber is cleaned by the desalination water in the desalination tank, realizing online automatic cleaning during the operation of the electrodialysis membrane stack. This effectively reduces the blockage of the electrodialysis system and greatly alleviates the problems caused by the blockage, such as decreased current efficiency, increased resistance, and the need for frequent cleaning or even disassembly and reassembly of the system. It also maintains the solute concentration of the concentrate circulating solution and avoids the problem of reduced concentrate concentration effect caused by the return of the cleaning solution to the concentrate. Attached Figure Description

[0047] The disclosure of this invention will become more readily understood by referring to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings:

[0048] Figure 1 A flowchart illustrating the operation of an electrodialysis system control method according to an embodiment of the present invention;

[0049] Figure 2 This is a schematic diagram of the structure of an electrodialysis system provided in an embodiment of the present invention;

[0050] Figure 3 This is a schematic diagram of the hardware structure of an electronic device for controlling an electrodialysis system, provided in an embodiment of the present invention. Detailed Implementation

[0051] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0052] It is readily understood that, based on the technical solution of this invention, various structural and implementation methods can be interchanged by those skilled in the art without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of the invention.

[0053] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the structures shown in the accompanying drawings. They are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0054] like Figure 1 As shown, Figure 1 A flowchart of a control method for an electrodialysis system provided in an embodiment of the present invention includes:

[0055] Step S101: Real-time monitoring of the operating status of the electrodialysis membrane stack;

[0056] Step S102: Switch the working mode of the electrodialysis membrane stack according to the operating status.

[0057] Specifically, the electrodialysis system mainly includes a desalination tank, a concentrate tank, an electrodialysis membrane stack, and a controller. The electrodialysis membrane stack includes a desalination chamber, a concentrate chamber, and an electrode water chamber. Before startup, desalination water, highly concentrated brine, and electrode water are added to the desalination tank, concentrate tank, and electrode water tank, respectively. Desalination water enters the desalination chamber and is desalinated, then flows out of the electrodialysis membrane stack and is recycled back to the desalination tank. Concentrate water enters the concentrate chamber and is concentrated, then flows out of the electrodialysis membrane stack and is recycled back to the concentrate tank. Electrode water enters the electrode water chamber where an electrode reaction occurs, then flows out of the electrodialysis membrane stack and is recycled back to the electrode water tank. During the operation of the electrodialysis system, the controller executes step S101 to monitor the operating status of the electrodialysis membrane stack in real time, including normal status and blockage status; then the controller executes step S102 to switch the working mode of the electrodialysis membrane stack according to the operating status, including a first working mode and a second working mode. In the first working mode, the concentrate chamber of the electrodialysis membrane stack is connected to the concentrate tank, and the desalination chamber of the electrodialysis membrane stack is connected to the desalination tank. In the second working mode, the desalination tank is connected to both the desalination chamber and the concentrate chamber.

[0058] In this embodiment of the invention, the operating status of the electrodialysis membrane stack is monitored in real time, and the operating mode of the electrodialysis membrane stack is switched according to the operating status. If the operating status is blocked, the concentrate chamber of the electrodialysis membrane stack is connected to the desalination tank, and the concentrate chamber is cleaned by the desalination water in the desalination tank. This realizes online automatic cleaning of the electrodialysis membrane stack during operation, which effectively reduces the blockage of the electrodialysis system and greatly alleviates the problems caused by the blockage, such as decreased current efficiency, increased resistance, and the need for frequent cleaning or even disassembly and reassembly of the system. It can also maintain the solute concentration of the concentrate circulating solution and avoid the problem of reduced concentrate concentration effect caused by the return of the cleaning solution to the concentrate.

[0059] In one embodiment, step S102 includes:

[0060] If the operating status is normal, the control working mode is the first working mode;

[0061] If the operating status is blocked, the control mode is the second operating mode.

[0062] Specifically, the freshwater tank includes a first inlet port and a first outlet port, the concentrate tank includes a second inlet port and a second outlet port, the concentrate chamber includes a third inlet port and a third outlet port, and the freshwater chamber includes a fourth inlet port and a fourth outlet port. If the operation is normal, the controller connects the first outlet port to the fourth inlet port, the fourth outlet port to the first inlet port, the second outlet port to the third inlet port, and the third outlet port to the second inlet port, thus connecting the freshwater tank to the freshwater chamber and the concentrate tank to the concentrate chamber. If the operation is normal... When the system is in a blocked state, the controller connects the first water outlet port to the third and fourth water inlets, and the first water inlet port to the third and fourth water outlets, respectively. This connects the desalination tank to the concentrate chamber and the desalination chamber, respectively. The desalination tank uses desalination water to clean the concentrate chamber, achieving online cleaning during the operation of the electrodialysis membrane stack. At the same time, it can maintain the solute concentration of the concentrate circulating solution to the maximum extent, thus avoiding the problem of decreased concentrate circulating solution concentration and decreased system operating efficiency caused by frequent cleaning of the system with clean water.

[0063] In one embodiment, the step of controlling the operating mode to a second operating mode if the operating state is a blocked state includes:

[0064] If the running status is blocked, the working mode will be switched to the first working mode according to the preset working cycle.

[0065] Specifically, if the controller detects that the electrodialysis membrane stack is in a blocked state, it controls the electrodialysis membrane stack to operate in the second working mode for a preset working cycle and then automatically switches to the first working mode to achieve automated control.

[0066] The preset working cycle can be set according to user needs, such as the size of the electrodialysis membrane stack. As long as the preset working cycle can ensure that the concentrate chamber can be fully cleaned when the electrodialysis membrane stack becomes clogged, it is acceptable.

[0067] In one embodiment, to improve control accuracy, the preset working cycle is determined by the following method:

[0068] Inject concentrated feed solution into the concentrated feed tank and record the initial feed solution level in the concentrated feed tank;

[0069] Start the circulation pump and record the target feed liquid level in the concentrate tank after the liquid level in the concentrate tank stabilizes.

[0070] The concentrate chamber level is calculated based on the initial feed liquid level and the target feed liquid level.

[0071] Obtain the membrane stack size parameters of the electrodialysis membrane stack;

[0072] The concentrate circulation flow rate is calculated based on the membrane stack size parameters and the preset circulation velocity.

[0073] The preset working cycle is calculated based on the chamber liquid level and concentrate circulation flow rate.

[0074] Specifically, the membrane stack size parameters include the number of membrane pairs, the thickness and length of the concentrate chamber, and the preset working cycle is the ratio of the concentrate chamber liquid level to the concentrate circulation flow rate, preferably 1-5 times the ratio of the concentrate chamber liquid level to the concentrate circulation flow rate.

[0075] The concentrate chamber level is the difference between the initial feed liquid level and the target feed liquid level.

[0076] The concentrate circulation flow rate is the product of the preset circulation velocity and the concentrate chamber liquid level.

[0077] The preset circulation velocity is 1-10 cm / s.

[0078] In one embodiment, step S102 includes:

[0079] If the operating status changes from normal to blocked, the operating mode is switched to the second operating mode according to the first preset delay time.

[0080] If the operating status changes from a blocked state to a normal state, the operating mode is switched to the first operating mode according to the second preset delay time.

[0081] Specifically, the first preset delay time and the second preset delay time can be determined by the concentrate chamber liquid level and the concentrate circulation flow rate. The first preset delay time is preferably 0.5 to 2 times the ratio of the concentrate chamber liquid level to the concentrate circulation flow rate. The second preset delay time is preferably 0.5 to 5 times the ratio of the concentrate chamber liquid level to the concentrate circulation flow rate.

[0082] In one embodiment, step S101 includes:

[0083] Real-time monitoring of the real-time inlet pressure of the concentrate chamber and / or the real-time outlet pressure of the concentrate chamber.

[0084] Obtain the initial inlet pressure of the concentrate chamber inlet port and / or the initial outlet pressure of the concentrate chamber outlet port;

[0085] The operating status of the electrodialysis membrane is determined based on the real-time inlet and / or real-time outlet pressure, as well as the initial inlet and / or initial outlet pressure.

[0086] Specifically, the inlet port of the concentrate chamber is equipped with a first inlet pressure sensor, and the outlet port of the concentrate chamber is equipped with a first outlet pressure sensor. The first inlet pressure sensor and the first outlet pressure sensor detect the real-time inlet pressure of the concentrate chamber inlet port and / or the real-time outlet pressure of the concentrate chamber outlet port in real time, respectively. Based on the initial inlet pressure of the concentrate chamber inlet port and / or the initial outlet pressure of the concentrate chamber outlet port, the operating status of the electrodialysis membrane stack can be automatically determined, thereby improving accuracy.

[0087] In one embodiment, to facilitate judgment and further improve accuracy, the step of determining the operating status of the electrodialysis membrane based on real-time inlet water pressure and / or real-time outlet water pressure, and initial inlet water pressure and / or initial outlet water pressure, includes:

[0088] If the difference between the real-time inlet water pressure and the initial inlet water pressure is greater than or equal to the preset first pressure threshold, the operating state is determined to be a blocked state.

[0089] In one embodiment, to facilitate judgment and further improve accuracy, the step of determining the operating status of the electrodialysis membrane based on real-time inlet water pressure and / or real-time outlet water pressure, and initial inlet water pressure and / or initial outlet water pressure, includes:

[0090] Calculate the initial pressure difference between the initial inlet pressure and the initial outlet pressure;

[0091] Calculate the real-time pressure difference between the real-time inlet pressure and the real-time outlet pressure;

[0092] If the difference between the real-time differential pressure value and the initial differential pressure value is greater than or equal to the preset second pressure threshold, the operating state is determined to be a blocked state.

[0093] like Figure 2 As shown, Figure 2 This is a schematic diagram of an electrodialysis system according to an embodiment of the present invention. The system includes an electrodialysis membrane stack 1, a desalination tank 21, a concentrate tank 31, an electrode water tank 41, and a controller 52. The electrodialysis membrane stack 1 includes a desalination chamber 11, a concentrate chamber 12, a first electrode water chamber 13, and a second electrode water chamber 14. The desalination tank 21 is connected to the electrodialysis membrane stack 1 through a first pipeline assembly. The concentrate tank 31 is connected to the electrodialysis membrane stack 1 through a second pipeline assembly. The electrode water tank 41 is connected to the first electrode water chamber 13 and the second electrode water chamber 14 through a third pipeline assembly. The controller 52 is used to control the working mode of the electrodialysis membrane stack 1 using the electrodialysis system control method described above.

[0094] Specifically, the controller 52 monitors the operating status of the electrodialysis membrane stack 1 in real time, including normal and blocked states. If the operating status of the electrodialysis membrane stack 1 is detected as normal, the controller 52 controls the desalination tank 21 to connect with the desalination chamber 11, the concentrate tank 31 to connect with the concentrate chamber 12, and the electrode water tank 41 to connect with the first electrode water chamber 13 and the second electrode water chamber 14. If the operating status of the electrodialysis membrane stack 1 is detected as blocked, the controller 52 controls the desalination tank 21 to connect with the concentrate chamber 12, and cleans the concentrate chamber 12 with the desalination water in the desalination tank 21. This achieves online automatic cleaning during the operation of the electrodialysis membrane stack, which effectively reduces the blockage of the electrodialysis system and greatly alleviates the problems caused by the blockage, such as decreased current efficiency, increased resistance, and the need for frequent cleaning or even disassembly and reassembly of the system. It also maintains the solute concentration of the concentrate circulating solution and avoids the problem of reduced concentrate concentration effect caused by the return of the cleaning solution to the concentrate.

[0095] Preferably, the freshwater chamber 11 is provided with a freshwater chamber partition, the concentrated water chamber 12 is provided with a concentrated water chamber partition, the first polar water chamber 13 is provided with a first polar water partition, and the first polar water chamber 13 is provided with a second polar water partition.

[0096] Preferably, the thickness of the dilute chamber partition and the concentrate chamber partition is 1mm-2mm, and the flow channel opening of the dilute chamber partition and the concentrate chamber partition is 1mm-4mm.

[0097] In this embodiment of the invention, the controller monitors the operating status of the electrodialysis membrane stack in real time and switches the operating mode of the electrodialysis membrane stack according to the operating status. If the operating status is blocked, the controller connects the concentrate chamber of the electrodialysis membrane stack to the desalination tank, and cleans the concentrate chamber with the desalination water in the desalination tank. This achieves online automatic cleaning of the electrodialysis membrane stack during operation, which effectively reduces the blockage of the electrodialysis system and greatly alleviates the problems caused by the blockage, such as decreased current efficiency, increased resistance, and the need for frequent cleaning or even disassembly and reassembly of the system. It also maintains the solute concentration of the concentrate circulating solution and avoids the problem of reduced concentrate concentration effect caused by the return of the cleaning solution to the concentrate.

[0098] In one embodiment, the first piping assembly includes a first inlet pipe, a second inlet pipe, a first outlet pipe, and a second outlet pipe; the second piping assembly includes a third inlet pipe and a third outlet pipe. The first inlet pipe is equipped with a first inlet valve 61 communicatively connected to the controller 52; the second inlet pipe is equipped with a second inlet valve 62 communicatively connected to the controller 52; the first outlet pipe is equipped with a first outlet valve 71 communicatively connected to the controller 52; the second outlet pipe is equipped with a second outlet valve 72 communicatively connected to the controller 52; the third inlet pipe is equipped with a third inlet valve 63 communicatively connected to the controller 52; and the third outlet pipe is equipped with a third outlet valve 73 communicatively connected to the controller 52.

[0099] The outlet port of the freshwater tank 21 is connected to the inlet port of the freshwater chamber 11 through the first inlet pipe and the first inlet valve 61, and the outlet port of the freshwater chamber 11 is connected to the inlet port of the freshwater tank 21 through the first outlet pipe and the first outlet valve 71.

[0100] The outlet port of the freshwater tank 21 is connected to the inlet port of the concentrated water chamber 12 through the second inlet pipe and the second inlet valve 62. The outlet port of the concentrated water chamber 12 is connected to the inlet port of the freshwater tank 21 through the second outlet pipe and the second outlet valve 72.

[0101] The outlet port of the concentrate tank 31 is connected to the inlet port of the concentrate chamber 12 through the third inlet pipe and the third inlet valve 63, and the outlet port of the concentrate chamber 12 is connected to the inlet port of the concentrate tank 31 through the third outlet pipe and the third outlet valve 73.

[0102] Specifically, if the controller 52 detects that the electrodialysis membrane stack is operating normally, the controller 52 controls the opening of the first inlet valve 61, the first outlet valve 71, the third inlet valve 63, and the third outlet valve 73, and controls the closing of the second inlet valve 62 and the second outlet valve 72, so that the desalination tank 21 is connected to the desalination chamber 11, and the concentrate tank 31 is connected to the concentrate chamber 12. If the controller 52 detects that the electrodialysis membrane stack is operating in a blocked state, the controller 52 controls the closing of the first inlet valve 61, the first outlet valve 71, the third inlet valve 63, and the third outlet valve 73, and controls the opening of the second inlet valve 62 and the second outlet valve 72, so that the desalination tank 21 is connected to the concentrate chamber 12, and the concentrate tank 31 is connected to the desalination chamber 11. The desalination water in the desalination tank 21 cleans the concentrate chamber 12, realizing online automatic cleaning during the operation of the electrodialysis membrane stack.

[0103] In one embodiment, in order to facilitate the determination of the operating status of the electrodialysis membrane stack, the inlet port of the concentrate chamber is provided with a first inlet pressure sensor 82, and the outlet port of the concentrate chamber is provided with a first outlet pressure sensor 91.

[0104] The first inlet pressure sensor 82 is used to detect the real-time inlet pressure of the inlet port of the concentrate chamber 12, and the first outlet pressure sensor 91 is used to detect the real-time outlet pressure of the outlet port of the concentrate chamber 12. The operating status of the electrodialysis membrane stack can be determined based on the real-time inlet pressure and the real-time outlet pressure of the concentrate chamber 12.

[0105] Preferably, the inlet port of the freshwater chamber 11 is provided with a second inlet pressure sensor 81, and the outlet port of the freshwater chamber 11 is provided with a second outlet pressure sensor 92.

[0106] The second inlet pressure sensor 81 is used to detect the inlet pressure of the freshwater chamber 11, and the second outlet pressure sensor 92 is used to detect the outlet pressure of the freshwater chamber 11. Based on the inlet and outlet pressures of the freshwater chamber 11 and the real-time inlet and outlet pressures of the concentrate chamber 12, it can be ensured that the pressures on both sides of the electrodialysis membrane stack are consistent during normal operation.

[0107] Preferably, in order to facilitate the control of the feed liquid, a fresh water circulation pump 22, a concentrated water circulation pump 32 and an electrode water circulation pump 42 are also provided. The fresh water circulation pump 22 is provided between the fresh water tank 21 and the fresh water chamber 11, the concentrated water circulation pump 32 is provided between the concentrated water tank 31 and the concentrated water chamber 12, and the electrode water circulation pump 42 is provided between the electrode water tank 41 and the first electrode water chamber 13 and the second electrode water chamber 14.

[0108] In one embodiment, the outlet port of the freshwater tank 21 is provided with a first flow meter 23 that is communicatively connected to the controller 52, the outlet port of the concentrated water tank 31 is provided with a second flow meter 33 that is communicatively connected to the controller 52, and the outlet port of the polar water tank 41 is provided with a third flow meter 43 that is communicatively connected to the controller 52.

[0109] The first flow meter 23 is used to detect the circulating flow rate of the fresh water chamber 11, the second flow meter 33 is used to detect the circulating flow rate of the concentrate chamber 12, and the third flow meter 43 is used to detect the circulating flow rate of the first electrode water chamber 13 and the second electrode water chamber 14. By detecting the circulating flow rate of each chamber, it is possible to determine in a timely manner whether the concentrate chamber is blocked.

[0110] In one embodiment, a DC power supply 51 is also included. The DC power supply 51 is electrically connected to the controller 52, the first water inlet valve 61, the second water inlet valve 62, the first water outlet valve 71, the second water outlet valve 72, the third water inlet valve 63, the third water outlet valve 73, the fourth water inlet valve 64, the fourth water outlet valve 74, the fresh water circulation pump 22, the concentrated water circulation pump 32, and the polar water circulation pump 42, and is powered by the DC power supply 51.

[0111] The working principle of the electrodialysis system provided by the invention is explained below:

[0112] When the electrodialysis membrane stack 1 is detected to be in a blocked state, the concentrate chamber 12 is cleaned with the fresh water solution in the fresh water tank 21. Because a first preset delay time (i.e., cleaning start delay) and a second preset delay time (i.e., cleaning end delay) are set, when cleaning starts, the freshwater solution in the freshwater tank 21 enters the concentrate chamber 12. Before the first preset delay time is reached, the outlet port of the concentrate chamber 12 is connected to the concentrate tank 31, sending the original concentrate solution in the concentrate chamber 12 back to the concentrate tank 31, thus retaining a portion of the concentrate solution. After the first preset delay time is reached, the controller 52 controls the first inlet valve 61, the first outlet valve 71, the third inlet valve 63, and the third outlet valve 73 to close, and controls the second inlet valve 62 and the second outlet valve 72 to open. The concentrate chamber 12 and the freshwater chamber 11 of the electrodialysis membrane stack 1 are both connected to the freshwater tank 21. Because the freshwater solution in the freshwater chamber 11 has a low salt content, it can clean the blockage inside the concentrate chamber 12. After the second preset delay time is reached, the freshwater circulation pump 22 is turned off, completing the cleaning process. Before resuming operation of the electrodialysis system, first switch the inlet port of the concentrate chamber 12 of the electrodialysis membrane stack 1 to connect it to the concentrate tank 31. Then, start the desalination circulation pump 22, concentrate circulation pump 32, and electrode water circulation pump 42. Before the second preset delay time is reached, connect the inlet port of the concentrate chamber 12 of the electrodialysis membrane stack 1 to the concentrate tank 31, and connect the outlet port of the concentrate chamber 12 to the desalination tank 21. This allows the low-salt content feed solution remaining in the concentrate chamber 12 of the electrodialysis membrane stack 1 due to cleaning to be returned to the desalination tank 21, preventing the low-salt content feed solution from returning to the concentrate tank 31 and reducing the concentrate concentration effect. After the second preset delay time is reached, control the third inlet valve 63 and the third outlet valve 73 to open, connecting the concentrate chamber 12 of the electrodialysis membrane stack 1 to the concentrate tank 31.

[0113] When the electrodialysis membrane stack 1 is detected to be in normal operating condition, the controller 52 controls the first inlet valve 61, the first outlet valve 71, the third inlet valve 63 and the third outlet valve 73 to open, and controls the second inlet valve 62 and the second outlet valve 72 to close, so that the freshwater tank 21 is connected to the freshwater chamber 11 and the concentrate tank 31 is connected to the concentrate chamber 12, and the electrodialysis system operates normally.

[0114] like Figure 3 As shown, a hardware structure diagram of an electronic device for controlling an electrodialysis system according to an embodiment of the present invention is provided, including:

[0115] At least one processor 301; and,

[0116] Memory 302 is communicatively connected to at least one processor 301; wherein,

[0117] The memory 302 stores instructions that can be executed by at least one processor 301, which enables the at least one processor 301 to perform the electrodialysis system control method as described above.

[0118] Figure 3 Take processor 301 as an example.

[0119] The electronic device is preferably an electronic control unit (ECU).

[0120] The electronic device may also include an input device 303 and an output device 304.

[0121] The processor 301, memory 302, input device 303 and output device 304 can be connected by a bus or other means. The figure shows an example of connection by bus.

[0122] The memory 302, as a non-volatile computer-readable storage medium, can be used to obtain non-volatile software programs, non-volatile computer-executable programs, and modules, such as the program instructions / modules corresponding to the electrodialysis system control method in the embodiments of this application, for example, Figure 1 The method flow is shown. The processor 301 executes various functional applications and data processing by running non-volatile software programs, instructions, and modules acquired in the memory 302, thereby realizing the electrodialysis system control method in the above embodiments.

[0123] The memory 302 may include a program acquisition area and a data acquisition area, wherein the program acquisition area may acquire the operating system and applications required for at least one function; the data acquisition area may acquire data created according to the use of the electrodialysis system control method, etc. Furthermore, the memory 302 may include high-speed random access memory and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 302 may optionally include memory remotely located relative to the processor 301, and these remote memories may be connected via a network to the apparatus performing the electrodialysis system control method. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0124] Input device 303 can receive user clicks and generate signal inputs related to user settings and function control of the electrodialysis system control method. Output device 304 may include display devices such as a display screen.

[0125] When the one or more modules are accessed in the memory 302 and are run by the one or more processors 301, the electrodialysis system control method in any of the above method embodiments is executed.

[0126] The above-described product can perform the methods provided in the embodiments of this application, and has the corresponding functional modules and beneficial effects for performing the methods. Technical details not described in detail in this embodiment can be found in the methods provided in the embodiments of this application.

[0127] The electronic devices of this invention exist in various forms, including but not limited to:

[0128] (1) Electronic Control Unit (ECU), also known as "vehicle computer" or "on-board computer", is mainly composed of microprocessor (CPU), memory (ROM, RAM), input / output interface (I / O), analog-to-digital converter (A / D), and large-scale integrated circuits for shaping and driving.

[0129] (2) Mobile communication devices: These devices are characterized by their mobile communication capabilities and primarily aim to provide voice and data communication. These terminals include: smartphones (e.g., iPhones), multimedia phones, feature phones, and low-end phones.

[0130] (3) Ultra-mobile personal computer devices: These devices fall under the category of personal computers, have computing and processing functions, and generally also have mobile internet access capabilities. These terminals include: PDAs, MIDs, and UMPCs, etc.

[0131] (4) Portable entertainment devices: These devices can display and play multimedia content. This category includes: audio and video players (such as iPods), handheld game consoles, e-books, as well as smart toys and portable car navigation devices.

[0132] (5) Server: A device that provides computing services. The components of a server include a processor, hard disk, memory, system bus, etc. Servers are similar to general computer architectures, but because they need to provide highly reliable services, they have higher requirements in terms of processing power, stability, reliability, security, scalability, and manageability.

[0133] (6) Other electronic devices with data interaction functions.

[0134] Furthermore, the logical instructions in the aforementioned memory 302 can be implemented as software functional units and sold or used as independent products, and can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a mobile terminal (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0135] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of the embodiments of the present invention according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0136] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0137] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention, and are not intended to limit them. Although the embodiments of the present invention have been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control method for an electrodialysis system, characterized in that, include: Real-time monitoring of the operating status of the electrodialysis membrane stack, including normal status and blockage status: real-time monitoring of the real-time inlet pressure of the concentrate chamber inlet port and / or the real-time outlet pressure of the concentrate chamber outlet port; Obtain the initial inlet pressure of the inlet port of the concentrate chamber and / or the initial outlet pressure of the outlet port of the concentrate chamber; The operating status of the electrodialysis membrane stack is determined based on the real-time inlet pressure and / or the real-time outlet pressure, as well as the initial inlet pressure and / or the initial outlet pressure. If the difference between the real-time inlet pressure and the initial inlet pressure is greater than or equal to a preset first pressure threshold, the operating state is determined to be the blockage state. The operating mode of the electrodialysis membrane stack is switched according to the operating status. The operating mode includes a first operating mode and a second operating mode: if the operating status is the normal state, the operating mode is controlled to be the first operating mode. If the operating state is the blocked state, the operating mode is controlled to the second operating mode; If the operating state changes from the normal state to the blocked state, the working mode is switched to the second working mode according to the first preset delay time. If the operating state changes from the blocked state to the normal state, the operating mode is switched to the first operating mode according to the second preset delay time. The first operating mode is that the concentrate chamber of the electrodialysis membrane stack is connected to the concentrate tank and the desalination chamber of the electrodialysis membrane stack is connected to the desalination tank. The second operating mode is that the desalination tank is connected to both the desalination chamber and the concentrate chamber.

2. The control method for an electrodialysis system as described in claim 1, characterized in that, If the operating state is the blocked state, controlling the operating mode to the second operating mode includes: If the operating state is the blocked state, the operating mode is switched to the first operating mode according to the preset working cycle.

3. The electrodialysis system control method as described in claim 2, characterized in that, The preset working cycle is determined by the following method: Inject concentrated feed solution into the concentrated feed tank and record the initial feed solution level in the concentrated feed tank; Start the circulation pump and record the target feed liquid level in the concentrate tank after the liquid level in the concentrate tank stabilizes. The concentrate chamber level is calculated based on the initial feed liquid level and the target feed liquid level. Obtain the membrane stack size parameters of the electrodialysis membrane stack; The concentrate circulation flow rate is calculated based on the membrane stack size parameters and the preset circulation flow rate. The preset working cycle is calculated based on the concentrate chamber liquid level and the concentrate circulation flow rate.

4. The control method for an electrodialysis system as described in claim 1, characterized in that, Determining the operating status of the electrodialysis membrane stack based on the real-time influent pressure and / or the real-time effluent pressure, and the initial influent pressure and / or the initial effluent pressure, includes: Calculate the initial pressure difference between the initial inlet pressure and the initial outlet pressure; Calculate the real-time pressure difference between the real-time inlet pressure and the real-time outlet pressure; If the difference between the real-time differential pressure value and the initial differential pressure value is greater than or equal to a preset second pressure threshold, the operating state is determined to be the blockage state.

5. An electrodialysis system, characterized in that, The system includes an electrodialysis membrane stack, a desalination tank, a concentrate tank, an electrode water tank, and a controller. The electrodialysis membrane stack includes a desalination chamber, a concentrate chamber, a first electrode water chamber, and a second electrode water chamber. The desalination tank is connected to the electrodialysis membrane stack via a first piping assembly. The concentrate tank is connected to the electrodialysis membrane stack via a second piping assembly. The electrode water tank is connected to both the first electrode water chamber and the second electrode water chamber via a third piping assembly. The controller is used to control the operating mode of the electrodialysis membrane stack using the electrodialysis system control method as described in any one of claims 1-4.

6. The electrodialysis system as described in claim 5, characterized in that, The first pipeline assembly includes a first inlet pipeline, a second inlet pipeline, a first outlet pipeline, and a second outlet pipeline. The second pipeline assembly includes a third inlet pipeline and a third outlet pipeline. The first inlet pipeline is provided with a first inlet valve that is communicatively connected to the controller. The second inlet pipeline is provided with a second inlet valve that is communicatively connected to the controller. The first outlet pipeline is provided with a first outlet valve that is communicatively connected to the controller. The second outlet pipeline is provided with a second outlet valve that is communicatively connected to the controller. The third inlet pipeline is provided with a third inlet valve that is communicatively connected to the controller. The third outlet pipeline is provided with a third outlet valve that is communicatively connected to the controller. The outlet port of the freshwater tank is connected to the inlet port of the freshwater chamber through the first inlet pipe and the first inlet valve, and the outlet port of the freshwater chamber is connected to the inlet port of the freshwater tank through the first outlet pipe and the first outlet valve. The outlet port of the freshwater tank is connected to the inlet port of the concentrated water chamber through the second inlet pipe and the second inlet valve, and the outlet port of the concentrated water chamber is connected to the inlet port of the freshwater tank through the second outlet pipe and the second outlet valve. The outlet port of the concentrate tank is connected to the inlet port of the concentrate chamber through the third inlet pipe and the third inlet valve, and the outlet port of the concentrate chamber is connected to the inlet port of the concentrate tank through the third outlet pipe and the third outlet valve.

7. The electrodialysis system as described in claim 6, characterized in that, The inlet port of the concentrate chamber is equipped with a first inlet pressure sensor, and the outlet port of the concentrate chamber is equipped with a first outlet pressure sensor.

8. The electrodialysis system as described in claim 7, characterized in that, The freshwater chamber has a second inlet pressure sensor at its inlet port and a second outlet pressure sensor at its outlet port.

9. The electrodialysis system as described in claim 7, characterized in that, It also includes a freshwater circulation pump, a concentrate circulation pump, and an electrode water circulation pump. The freshwater circulation pump is provided between the freshwater tank and the freshwater chamber, the concentrate circulation pump is provided between the concentrate tank and the concentrate chamber, and the electrode water circulation pump is provided between the electrode water tank and the first electrode water chamber and the second electrode water chamber.

10. An electronic device for a control method of an electrodialysis system, characterized in that, include: At least one processor; as well as, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the electrodialysis system control method as described in any one of claims 1-4.

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