Flow acquisition control system and electrodialysis membrane separation device

Abstract

The utility model relates to the technical field of electrodialysis, and discloses a flow collection control system and an electrodialysis membrane separation device, the flow collection control system is applied to a membrane separation device comprising a plurality of flow channels, the flow collection control system comprises a plurality of flow regulation modules and a controller, the flow sensor is used for acquiring flow data entering the flow channel and adjusting the flow of the corresponding flow channel; the controller is connected with the flow adjusting module and used for obtaining the flow data of the multiple flow channels and controlling the flow of the flow channels according to the flow data of the flow channels so that the flow difference value of the flow channels can be within the preset difference value range. According to the utility model, the flow regulating modules are arranged on the flow channels, and the controller is used for acquiring and controlling the flow data of the flow channels, so that the flow of the flow channels is balanced, the problems of congestion or bias current, incapability of reaching the optimal value of the electric power of the membrane stack for a long time, large resistance and the like are solved, and the conductive effect and the mass transfer effect of liquid ions are improved; and the requirement of industrial automatic control is met.

Description

Technical Field

[0001] This utility model relates to the field of electrodialysis technology, specifically to a flow acquisition and control system and an electrodialysis membrane separation device. Background Technology

[0002] Research on electrodialysis technology began in Germany. In 1903, Morse and Pierce placed two electrodes inside and outside the dialysis bag solution, respectively, and discovered that charged impurities could be rapidly removed from the gel. In 1924, Pauli improved Morse's experimental apparatus using principles of chemical engineering design, aiming to reduce polarization and increase the mass transfer rate. However, it wasn't until Juda successfully developed a highly selective ion-exchange membrane in 1950 that electrodialysis technology entered the practical application stage, undergoing three major innovations: the application of selective ion-exchange membranes, the design of multi-compartment electrodialysis modules, and the adoption of frequent electrode reversal operation. Currently, with continuous innovation and improvement in the performance of ion-exchange membranes and the structure of electrodialysis devices, electrodialysis technology has entered a new stage of development, and its application prospects are even broader.

[0003] An electrodialysis unit consists of main components such as diaphragms, ion exchange membranes, bipolar membranes, electrodes, and clamping devices. Ion exchange membranes selectively permeate ions with different charges. A cation exchange membrane allows only cations to pass through while blocking anions, and an anion exchange membrane allows only anions to pass through while blocking cations. Under the influence of a DC electric field, the bipolar membrane causes H₂O to dissociate into H₂. + and OH - And through the anion and cation membranes respectively, as H + and OH - Ion source. Under the influence of an applied DC electric field, ions in water undergo directional migration. Since the electrodialysis unit consists of multiple compartments, anions and cations in the dilute compartment migrate to the adjacent concentrated compartment, thus desalinating the brine or causing acid or alkali production. In the food and pharmaceutical industries, electrodialysis can be used to remove electrolyte ions from organic solutions, and its applications in whey desalination, sugar desalination, and amino acid refining have been quite successful. As a relatively new membrane separation technology, electrodialysis plays an important role in natural water desalination, seawater concentration for salt production, wastewater treatment, and waste salt recovery for acid and alkali production, and has become a relatively mature water treatment method.

[0004] The multi-layered compartments in an electrodialysis membrane separation device are composed of various ion exchange membranes, grids, gaskets, and electrodes, which are clamped and stacked with gaps of about 0.6 to 1.0 mm. The feed solution to be treated needs to flow within these gaps. Typically, a large membrane stack can consist of up to 480 pairs of membranes, resulting in more than 1440 flow channels. This can easily lead to uneven liquid flow between the membrane channels, resulting in poor conductivity, poor liquid ion mass transfer, congestion, and the membrane stack's electrical power may not reach its optimal value for a long time, as well as high resistance. Ultimately, this leads to low overall operating efficiency and a high failure rate of the device, requiring frequent shutdowns for cleaning to alleviate the problem. Utility Model Content

[0005] In view of this, the present invention provides a flow acquisition and control system and an electrodialysis membrane separation device to solve the problem of uneven liquid flow in the flow channel of the electrodialysis membrane separation device.

[0006] In a first aspect, this utility model provides a flow acquisition and control system applied to a membrane separation device including multiple flow channels. The flow acquisition and control system includes: multiple flow regulation modules and a controller, wherein...

[0007] The flow regulation module is installed on the flow channel and is used to acquire the flow data entering its own flow channel and regulate the flow of the corresponding flow channel.

[0008] The controller, connected to the flow regulation module, is used to acquire flow data from multiple channels and control the flow rate of each channel based on the flow data, so that the flow rate difference between the channels is within a preset range.

[0009] The flow acquisition and control system provided by this utility model, by installing flow regulation modules on each membrane module flow channel and using a controller to acquire and control the flow data of each flow channel, makes the flow of each flow channel more balanced, avoids problems such as congestion or flow deviation, membrane stack power not reaching the optimal value for a long time, and high resistance, improves conductivity and liquid ion mass transfer, and meets the needs of industrial automatic control.

[0010] In one optional implementation, the flow regulation module includes: a flow data acquisition submodule and a flow control submodule sequentially installed on the flow channel, wherein...

[0011] The flow data acquisition submodule has its output end connected to the input end of the controller. It is used to collect real-time flow data entering the target flow channel, which is the corresponding flow channel installed in the flow data acquisition submodule.

[0012] The flow control submodule, whose input is connected to the output of the controller, is used to control the flow rate entering the target flow channel.

[0013] The flow acquisition and control system provided by this utility model realizes real-time acquisition of flow data by sequentially installing flow data acquisition sub-modules on the flow channel, and uses the flow control sub-module to control the flow rate entering the target flow channel, accurately distributing the large flow rate of liquid in the main pipeline into multiple small flow rate liquids, thereby improving the automation level of flow distribution and increasing production efficiency.

[0014] In one optional implementation, the traffic data acquisition submodule includes: a data acquisition unit and a data conversion unit, wherein,

[0015] The data acquisition unit, whose output is connected to the input of the data conversion unit, is used to acquire the raw flow data of the channel.

[0016] The data conversion unit, whose output is connected to the input of the controller, is used to acquire raw traffic data and convert it into a frequency signal for transmission to the controller.

[0017] In one alternative implementation, the data acquisition unit is a Hall effect flow meter sensor.

[0018] The flow acquisition and control system provided by this utility model separates the data acquisition unit and the data processing unit, reducing the size of the equipment and meeting the requirements of industrial integrated design. It uses Hall effect flow meter sensors to collect flow data, which has high data accuracy and fast response speed. The Hall effect flow meter sensor has a compact design and small size, saving the space occupied by the equipment.

[0019] In one optional implementation, the flow control submodule includes: a flow control drive unit and a pneumatic diaphragm control valve, wherein,

[0020] The flow control drive unit has its input end connected to the output end of the controller and its output end connected to the input end of the pneumatic diaphragm control valve. It is used to receive the flow control command of the corresponding flow channel, convert the flow control command into air source pressure and transmit it to the pneumatic diaphragm control valve.

[0021] A pneumatic diaphragm control valve is used to change the opening degree of the pneumatic diaphragm control valve according to the air source pressure, thereby controlling the flow rate of the corresponding flow channel.

[0022] The flow acquisition and control system provided by this utility model adjusts the flow rate of liquid in the flow channel by controlling the opening of the pneumatic diaphragm control valve. It is suitable for various complex and harsh industrial production environments. The flow control drive unit converts the controller's flow control command into a gas source pressure signal, thereby improving the accuracy and stability of flow control.

[0023] In one alternative embodiment, the pneumatic diaphragm control valve includes a diaphragm valve, a butterfly valve, a piston valve, a shut-off valve, or a ball valve.

[0024] When the pipe diameter of the flow channel is greater than the preset pipe threshold, a butterfly valve, piston valve, gate valve, or ball valve is selected as the pneumatic diaphragm control valve of the flow channel.

[0025] When the pipe diameter of the flow channel is not greater than the preset pipe threshold, a diaphragm valve is selected as the pneumatic diaphragm control valve for the flow channel.

[0026] In one alternative implementation, the pneumatic diaphragm control valve is either a normally open valve or a normally closed valve.

[0027] The flow acquisition and control system provided by this utility model selects different types of valves according to the pipe diameter of the flow channel to ensure effective control of the flow rate in various pipe diameters. The pneumatic diaphragm control valve is selected as a normally open valve to avoid the risk of damage to related equipment in the event of power failure or air supply failure, thereby improving safety.

[0028] In one alternative implementation, the controller includes: a distributed control system, a programmable logic controller, or a microcontroller.

[0029] The flow acquisition and control system provided by this utility model allows for the selection of different types of controllers based on the actual field equipment conditions, making the application more flexible and eliminating the need for a separate controller, thus reducing equipment costs.

[0030] Secondly, this utility model provides an electrodialysis membrane separation device, which includes the flow acquisition and control system of any one of the first aspects.

[0031] The electrodialysis membrane separation device provided by this utility model uses the flow acquisition and control system of any one of the first aspects to detect and adjust the real-time flow of each channel, so as to keep the flow of each channel balanced, improve the overall operating efficiency of the electrodialysis membrane separation device, reduce the failure rate and the need for frequent shutdowns for cleaning. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the flow acquisition and control system according to an embodiment of the present utility model;

[0034] Figure 2 This is a schematic diagram of another flow acquisition and control system according to an embodiment of the present utility model;

[0035] Figure 3 This is a schematic diagram of the structure of another flow acquisition and control system according to an embodiment of the present utility model;

[0036] Figure 4 This is a schematic diagram of the structure of an electrodialysis membrane separation device according to an embodiment of the present invention. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0038] This utility model provides a flow acquisition and control system and an electrodialysis membrane separation device, which automatically detects and controls the flow rate of each channel to achieve the effect of balancing the flow rate of each channel.

[0039] According to an embodiment of the present invention, a flow acquisition and control system is provided, which is applied to a membrane separation device including multiple flow channels, such as... Figure 1 As shown, the flow acquisition and control system includes: multiple flow regulation modules 1 and controller 2.

[0040] like Figure 1 As shown, the flow regulation module 1 is installed on the flow channel and is used to acquire the flow data entering its own flow channel and regulate the flow of the corresponding flow channel.

[0041] Specifically, the flow regulation module 1 is installed at any position in the flow channel, collects the flow data of the channel in real time, and adjusts the flow rate of the channel. The membrane separation device includes multiple flow channels: the first flow channel, the second flow channel, ..., the nth flow channel. The first flow regulation module 1 is installed on the first flow channel, the second flow regulation module 1 is installed on the second flow channel, ..., the nth flow channel is installed on the nth flow channel.

[0042] like Figure 1 As shown, controller 2 is connected to flow regulation module 1 and is used to acquire flow data of multiple channels and control the flow rate of each channel according to the flow data of each channel so that the flow difference of each channel is within a preset difference range.

[0043] Specifically, controller 2 executes instructions corresponding to the intelligent algorithm to collect flow rate data and control the flow rate. For example, if the real-time flow rates of n channels are Q1, Q2, Q3, ..., Qn, then the average value of the real-time flow rates of the n channels is calculated. If the real-time flow rate Q1 of the first flow channel is equal to the average flow rate... If the difference is greater than a preset threshold, the real-time flow rate of the first flow channel will be reduced to bring the flow rate of the first flow channel closer to the average value. If the difference is within the preset threshold range, the flow control process for other channels is the same as for the first channel, and will not be repeated here. The preset threshold can be set according to the actual situation, and no specific restrictions are imposed here.

[0044] It can be divided into more than 56 flow channel groups according to process requirements. The liquid flow rate of each flow channel is evenly distributed in real time between each group of flow channels, and the operating status of each membrane stack is detected. The membrane stack cleaning cycle can be accurately predicted in advance, and it can be linked with the power supply for control. This can effectively avoid membrane stack burn-through, scaling and other problems, improve current efficiency and membrane efficiency, stabilize quality and increase production.

[0045] The flow acquisition and control system provided in this embodiment, by installing flow regulation modules 1 on each membrane module flow channel and using controller 2 to acquire and control the flow data of each flow channel, makes the flow of each flow channel more balanced, avoids problems such as congestion or flow deviation, membrane stack power not reaching the optimal value for a long time, and high resistance, improves the conductivity and mass transfer effect of liquid ions, and meets the needs of industrial automatic control.

[0046] In some alternative implementations, such as Figure 2 As shown, the flow regulation module 1 includes: a flow data acquisition submodule 11 and a flow control submodule 12, which are installed sequentially on the flow channel.

[0047] like Figure 2 As shown, the flow data acquisition submodule 11 has its output end connected to the input end of the controller 2, and is used to acquire real-time flow data entering the target flow channel. The target flow channel is the corresponding flow channel installed in the flow data acquisition submodule 11.

[0048] Specifically, each flow channel is equipped with a flow data acquisition submodule 11 and a flow control submodule 12. The flow data acquisition submodule 11 can directly acquire the real-time flow data of the target flow channel through the wall of the target flow channel, convert the acquired real-time flow data into a format that the controller 2 can recognize and use, and transmit the converted real-time flow data to the controller 2.

[0049] like Figure 2 As shown, the flow control submodule 12 has its input end connected to the output end of the controller 2 and is used to control the flow rate entering the target flow channel.

[0050] Specifically, the flow control submodule 12 receives flow control instructions from the controller 2 and executes corresponding flow adjustment actions to control the amount of flow entering the target flow channel.

[0051] The flow acquisition and control system provided in this embodiment realizes real-time acquisition of flow data by sequentially installing flow data acquisition sub-modules 11 on the flow channel, and uses flow control sub-modules 12 to control the flow rate entering the target flow channel, accurately distributing the large flow rate liquid in the main pipeline into multiple small flow rate liquids, thereby improving the automation level of flow distribution and increasing production efficiency.

[0052] In some alternative implementations, such as Figure 3 As shown, the traffic data acquisition submodule 11 includes: a data acquisition unit 111 and a data conversion unit 112.

[0053] like Figure 3 As shown, the data acquisition unit 111 has its output terminal connected to the input terminal of the data conversion unit 112, and is used to acquire the raw flow data of the flow channel. The raw flow data includes, but is not limited to: pulse, voltage, current, resistance, etc.

[0054] In some alternative implementations, the data acquisition unit 111 is a Hall effect flow meter sensor FT.

[0055] Specifically, a flow meter using a turbine or rotary Hall signal is used to collect raw flow data. The Hall flow meter sensor FT mainly consists of a plastic valve body, a water flow rotor assembly, a ceramic shaft, and a Hall sensor. It can be installed at the inlet or outlet of the flow channel to detect the real-time flow of the liquid medium in the flow channel. When the liquid passes through the water flow rotor assembly, the magnetic rotor rotates, and the rotation speed changes with the flow rate. The Hall sensor outputs a corresponding pulse signal, which is fed back to the data conversion unit 112.

[0056] The operating voltage of the data acquisition unit 111 is DC. 5V-24V; Operating temperature: ≤80℃; Operating pressure: ≤1.70Mpa; Heat resistance: After being placed in an environment of 80±2℃ for 48 hours, returning to room temperature for 1-3 hours shows no abnormalities, and the parts show no cracks, loosening, expansion, deformation, etc., with a precision change within 9%; Cold resistance: After being placed in an environment of -18±3℃ for 48 hours, returning to room temperature for 1-3 hours shows no abnormalities, and the parts show no cracks, expansion, deformation, etc., with a precision change within 9%; Moisture resistance: After being placed in an environment of 40±2℃ and relative humidity of 90%~94%RH for 72 hours, the insulation resistance is above 1MΩ; Pull-out strength: When a 10N pull force is applied to the lead wire for 1 minute, there is no loosening or breakage, and the performance remains unchanged; Durability: At room temperature, 0.1MPa water pressure is introduced from the inlet end of the flow channel, with a cycle of 1 second on and 0.5 seconds off, and 250,000 tests are conducted without abnormalities, demonstrating good application applicability.

[0057] It should be noted that, Figure 3 Taking one flow channel as an example, the connection methods of the flow data acquisition submodule 11 and flow control submodule 12 to the controller in the other flow channels are the same as those in the example. Figure 2 The same applies, so I will not repeat it here.

[0058] like Figure 3 As shown, the data conversion unit 112 has its output terminal connected to the input terminal of the controller 2. It is used to acquire the raw flow data and convert the raw flow data into a frequency signal for transmission to the controller 2.

[0059] Specifically, the raw flow data transmitted by the Hall flow meter sensor FT is a pulse signal. After receiving the pulse signal, the data conversion unit 112 converts the pulse signal into a frequency signal and transmits it to the controller 2. The controller 2 uses an intelligent algorithm to process the frequency signal and analyze it to obtain the real-time flow signal.

[0060] The data conversion unit 112 operates on a DC 24V power supply and features a 32-bit high-speed counter / frequency / encoder measurement function with multiple mode options, including but not limited to "up counter," "frequency measurement," "up / down counter," and "A / B phase counter" modes. Each channel's mode can be set independently, and multiple channels can use the same mode simultaneously. The built-in digital filter can filter out noise with high / low pulse widths smaller than the minimum width of the high / low digital filter. It supports multiple communication protocols, including MODBUS RTU based on RS485-RTU / RS232 interfaces, facilitating real-time transmission of the converted frequency signal to the controller 2.

[0061] The flow acquisition and control system provided in this embodiment separates the data acquisition unit 111 and the data processing unit, reducing the size of the equipment and meeting the requirements of industrial integrated design. It uses the Hall flow meter sensor FT to collect flow data, which has high data accuracy and fast response speed. The Hall flow meter sensor FT has a compact design and small size, saving the space occupied by the equipment.

[0062] In some alternative implementations, such as Figure 3 As shown, the flow control submodule 12 includes: a flow control drive unit 121 and a pneumatic diaphragm control valve 122.

[0063] like Figure 3 As shown, the flow control drive unit 121 has its input end connected to the output end of the controller 2 and its output end connected to the input end of the pneumatic diaphragm control valve 122. It is used to receive the flow control command of the corresponding flow channel, convert the flow control command into air source pressure and transmit it to the pneumatic diaphragm control valve 122.

[0064] Specifically, this embodiment uses a specially customized electric proportional regulating valve that can receive various signals such as DC4~20mA / DC0~5V / DC0~10V (flow control commands issued by controller 2), and controls the output air source pressure within 0.005~0.5Mpa according to the received signals. By outputting different amounts of air source pressure, the opening degree of the pneumatic diaphragm control valve 122 is driven, thereby controlling the flow rate of the flow channel.

[0065] like Figure 3 As shown, the pneumatic diaphragm control valve 122 is used to change the opening degree of the pneumatic diaphragm control valve 122 according to the air source pressure, thereby controlling the flow rate of the corresponding flow channel.

[0066] Specifically, this embodiment employs a customized pneumatic diaphragm control valve 122, which mainly consists of a control valve and a pneumatic actuator. Compressed air powers the pneumatic actuator to adjust the opening of the control valve, thereby controlling the flow rate of the liquid medium in the flow channel. The intelligent algorithm in the controller 2 enables precise adjustment of the control valve opening, ensuring stability, reliability, and high accuracy. Furthermore, it significantly reduces hardware costs, facilitating large-scale applications.

[0067] Structurally, the control valve adopts a corrosion-resistant valve body and corrosion-resistant diaphragm, a stuffing box-less structure, an elastic diaphragm as the throttling element, and a smooth valve body flow channel. The pneumatic plastic diaphragm valve has the advantages of low stress, large flow rate, no external leakage, convenience and reliability, fire and explosion protection. It is widely used in industrial automation systems for flow regulation of strong acid, strong alkali, strong corrosive, high viscosity, particle-containing, fiber-containing, toxic and non-polluting media.

[0068] The diaphragm valve opens and closes by applying pressure from the pipeline to a reinforced rubber diaphragm. When the pressurized medium enters the valve control chamber, the diaphragm depresses, closing the valve passage. When the pressure in the control chamber is released to the atmosphere or downstream pipeline, the diaphragm rises, opening the valve passage. The valve has no valve stem, gasket, or guide seat; the only moving part in the passage is the diaphragm, thus eliminating corrosion and seizing, resulting in higher stability. Various structural and control configurations are available to suit diverse fluid control needs. The diaphragm valve used in this embodiment is primarily made of UPVC / CPVC and other plastic materials, employing an air-to-close mechanism to better prevent equipment damage in case of air supply failure.

[0069] The flow acquisition and control system provided in this embodiment adjusts the flow rate of liquid in the flow channel by adjusting the opening of the pneumatic diaphragm control valve 122. It is suitable for various complex and harsh industrial production environments. The flow control drive unit 121 converts the flow control command of the controller 2 into a gas source pressure signal, thereby improving the accuracy and stability of flow control.

[0070] In some alternative embodiments, the pneumatic diaphragm control valve 122 includes a diaphragm valve, a butterfly valve, a piston valve, a shut-off valve, or a ball valve.

[0071] When the pipe diameter of the flow channel is greater than the preset pipe threshold, a butterfly valve, piston valve, gate valve, or ball valve is selected as the pneumatic diaphragm control valve 122 of the flow channel.

[0072] When the pipe diameter of the flow channel is not greater than the preset pipe threshold, a diaphragm valve is selected as the pneumatic diaphragm control valve 122 of the flow channel.

[0073] Specifically, butterfly valves are typically used in flow channels with pipe diameters of 50mm or more to control large flow rates, while diaphragm valves are typically used in flow channels with pipe diameters of 50mm or less to control small flow rates. During the system equipment selection phase, the different types and models of control valves corresponding to the pipe diameter of the flow channel are determined. The diaphragm valve in this embodiment can be a non-dead-angle (sanitary) diaphragm switching valve to improve the cleanliness of the liquid in the flow channel; this is merely an example and not a limitation.

[0074] In some alternative implementations, the pneumatic diaphragm control valve 122 is a normally open valve or a normally closed valve.

[0075] Specifically, normally open valves and normally closed valves are two types of valves with different operating states. Their operation can be used to protect the system and equipment in the event of a power or gas supply failure. In practical applications, either normally open or normally closed valves can be selected based on specific requirements.

[0076] Normally closed valve: This type of valve is closed when no external control signal (such as electricity or gas pressure) is applied. It opens when the control system is operating normally and providing a control signal. If a power or gas supply failure occurs, the control signal disappears, and the valve automatically closes. This design is very useful for preventing the leakage of hazardous media, such as in chemical plants or gas supply systems, as it can stop fluid flow in the event of a power or gas supply failure, thereby avoiding potential hazards.

[0077] Normally open valves: Unlike normally closed valves, normally open valves are open when there is no control signal and only close when a control signal is received. These valves are suitable for scenarios that require ensuring the flow of media, such as in fire protection systems, where normally open valves can keep the passage open in the event of power or control system failure, ensuring that the extinguishing agent can pass smoothly.

[0078] The flow acquisition and control system provided in this embodiment selects different types of valves according to the pipe diameter of the flow channel to ensure effective control of the flow rate in various pipe diameters. The pneumatic diaphragm control valve 122 is selected as a normally open valve to avoid the risk of damage to related equipment in the event of power failure or air source failure, thereby improving safety.

[0079] In some alternative implementations, such as Figure 3 As shown, controller 2 includes: a distributed control system or a programmable logic controller 2 or a microcontroller.

[0080] Specifically, based on various PLCs / DCSs / microcontrollers / intelligent controllers, real-time acquisition and control of flow meter signals are achieved through the design and application of intelligent algorithms. Centered on intelligent algorithms, and through a combination of hardware and software design, the flow acquisition unit, data conversion unit 112, pneumatic diaphragm control valve 122, and flow control drive unit 121 are perfectly integrated into one unit, transforming previously independent working units into a single intelligent, advanced, and efficient intelligent working device. This allows for customized applications based on actual needs, improving flow regulation efficiency and reducing the processing time cycle of the flow regulation process to within 300ms. It provides a perfect solution and technical guidance for applications such as electrodialysis membranes and bipolar membranes, meeting industry requirements for automatic control and safety protection while significantly reducing investment costs and equipment size.

[0081] The flow acquisition and control system provided in this embodiment allows the controller 2 to be selected according to the actual field equipment conditions, making the application more flexible and eliminating the need to use a separate controller 2, thus reducing equipment costs.

[0082] This embodiment provides an electrodialysis membrane separation device, such as... Figure 4 As shown, the electrodialysis membrane separation device includes the flow acquisition and control system of any of the previous embodiments.

[0083] The electrodialysis membrane separation device provided in this embodiment uses the flow acquisition and control system of any one of the previous embodiments to detect and adjust the real-time flow of each channel, so as to keep the flow of each channel balanced, improve the overall operating efficiency of the electrodialysis membrane separation device, reduce the failure rate and the need for frequent shutdowns for cleaning.

[0084] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A flow acquisition and control system, characterized in that, The flow acquisition and control system, applied to a membrane separation device comprising multiple flow channels, includes: multiple flow regulation modules and a controller, wherein... The flow regulation module is installed on the flow channel and is used to acquire the flow data entering its own flow channel and regulate the flow of the corresponding flow channel. The controller, which is connected to the flow regulation module, is used to acquire flow data of multiple channels and control the flow rate of each channel according to the flow data of each channel, so that the flow difference of each channel is within a preset difference range.

2. The flow acquisition and control system according to claim 1, characterized in that, The flow regulation module includes: a flow data acquisition submodule and a flow control submodule sequentially installed on the flow channel, wherein, The flow data acquisition submodule has its output end connected to the input end of the controller and is used to acquire real-time flow data entering the target flow channel, wherein the target flow channel is the corresponding flow channel installed on the flow data acquisition submodule. The flow control submodule, whose input is connected to the output of the controller, is used to control the flow rate entering the target flow channel.

3. The flow acquisition and control system according to claim 2, characterized in that, The traffic data acquisition submodule includes: a data acquisition unit and a data conversion unit, wherein, The data acquisition unit has its output end connected to the input end of the data conversion unit, and is used to acquire the raw flow data of the channel. The data conversion unit, whose output is connected to the input of the controller, is used to acquire the raw traffic data and convert the raw traffic data into a frequency signal for transmission to the controller.

4. The flow acquisition and control system according to claim 3, characterized in that, The data acquisition unit is a Hall effect flow meter sensor.

5. The flow acquisition and control system according to claim 2, characterized in that, The flow control submodule includes: a flow control drive unit and a pneumatic diaphragm control valve, wherein, A flow control drive unit, whose input end is connected to the output end of the controller and whose output end is connected to the input end of the pneumatic diaphragm control valve, is used to receive flow control commands from the corresponding flow channel, convert the flow control commands into air source pressure and transmit them to the pneumatic diaphragm control valve. A pneumatic diaphragm control valve is used to change the opening degree of the pneumatic diaphragm control valve according to the air source pressure, thereby controlling the flow rate of the corresponding flow channel.

6. The flow acquisition and control system according to claim 5, characterized in that, The pneumatic diaphragm control valve includes a diaphragm valve, butterfly valve, piston valve, shut-off valve, or ball valve. When the pipe diameter of the flow channel is greater than the preset pipe threshold, a butterfly valve, a piston valve, a shut-off valve, or a ball valve is selected as the pneumatic diaphragm control valve of the flow channel. When the pipe diameter of the flow channel is not greater than the preset pipe threshold, a diaphragm valve is selected as the pneumatic diaphragm control valve of the flow channel.

7. The flow acquisition and control system according to claim 6, characterized in that, The pneumatic diaphragm control valve is either a normally open valve or a normally closed valve.

8. The flow acquisition and control system according to claim 1, characterized in that, The controller includes: a distributed control system, a programmable logic controller, or a microcontroller.

9. An electrodialysis membrane separation device, characterized in that, The electrodialysis membrane separation device includes the flow acquisition and control system as described in any one of claims 1-8.

Images