Filter press system

Abstract

The present application discloses a filter press system, which belongs to the technical field of mechanical equipment. The filter press system includes: a water washing kettle, which is used to hold the material to be filtered; a vertical filter press, which includes a plurality of plate frames, and the plurality of plate frames are respectively connected to the outlet of the water washing kettle through corresponding feed branches, and the plurality of feed branches are provided with branch control valves and flow meters; a controller, which is electrically connected to the control valve and the flow meter, and is configured to control the opening and closing of the branch control valve based on the collected signal of the flow meter when the water washing kettle outputs the material to be filtered. In the technical solution of the present application, the opening and closing of the branch control valve is automatically adjusted by the real-time data collected by the flow meter, so that the material flow can be accurately controlled, and the material flow entering the plurality of plate frames can be kept stable and evenly distributed, thereby optimizing the solid-liquid separation effect of the filter press system and improving production efficiency and product quality.

Description

Technical Field

[0001] The present application belongs to the technical field of mechanical equipment, and in particular, relates to a filter press system. Background Art

[0002] Vertical automatic filter presses are widely used for separation of solids and liquids, and the initial drying of filter cakes is mainly completed by extrusion or air blowing processes. In the related art, the traditional vertical automatic filter press cannot control the weight of the slurry in each layer of the plate frame during the feeding process, resulting in large differences in the thickness of the filter cakes in each layer of the plate frame after extrusion, and the air blowing time and pressure of each layer of the plate frame are the same, and the quality of the filter cake products obtained after air blowing is also different. In the field of positive electrode materials, when the vertical automatic filter press is used for filtration, there are unstable product batches, some filter cakes have too low moisture content and dust overflows, and some filter cakes have a high moisture content, which affects the residual alkali index on the surface of the positive electrode material product, and there is room for improvement. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the related art. To this end, the present application proposes a filter press system that can dynamically adjust the moisture content of materials in each plate frame until the moisture content is close.

[0004] In a first aspect, the present application provides a filter press system, comprising:

[0005] The water washing kettle is used to hold the materials to be filtered;

[0006] A vertical filter press comprises a plurality of plate frames, wherein the plurality of plate frames are respectively connected to the outlet of the water washing kettle through corresponding feed branch pipes, and the plurality of feed branch pipes are each provided with a branch control valve and a flow meter;

[0007] The controller is electrically connected to the branch control valve and the flow meter, and is configured to control the opening and closing of the branch control valve based on the collected signal of the flow meter when the water washing kettle outputs the material to be filtered.

[0008] In the above technical solution, the opening and closing of the branch control valve is automatically adjusted by the real-time data collected by the flow meter, so as to realize precise control of the material flow and maintain the stability and uniform distribution of the material flow entering the multiple plate frames, thereby optimizing the solid-liquid separation effect of the filter press system and improving production efficiency and product quality.

[0009] According to one embodiment of the present application, the controller is electrically connected to the water washing tank, and is configured to determine the amount of material allocated to each plate frame based on the total amount of material in the water washing tank and the number of plates and frames included in the vertical filter press, and control the opening and closing of each branch control valve based on the determined amount of material allocated to each plate frame and the collected signal of the flow meter.

[0010] In the above technical solution, the controller calculates the material distribution amount of each plate frame based on the total material amount of the water washing kettle and the number of plates and frames of the vertical filter press, and then accurately controls the opening and closing of the branch control valve in combination with the feedback signal of the flow meter, thereby achieving accurate distribution of material flow, thereby improving the working efficiency and filtering effect of the vertical filter press.

[0011] According to one embodiment of the present application, the flow meter is arranged in the middle of the feed branch pipe, and the branch control valve is arranged at the end of the feed branch pipe close to the plate frame.

[0012] In the above technical solution, when the flow meter is arranged in the middle of the feed branch pipe and the branch control valve is arranged near the end of the plate frame, the controller can achieve efficient and uniform material distribution so that each plate frame can receive the same quality of material, thereby improving the overall filtration efficiency and processing capacity.

[0013] According to one embodiment of the present application, the filter press system further includes: a feed main pipe, and the plurality of feed branch pipes are all connected to the outlet of the water washing kettle through the feed main pipe.

[0014] In the above technical solution, the arrangement of the feed main pipe and the plurality of feed branch pipes in the filter press system is helpful for the balanced distribution of material flow.

[0015] According to one embodiment of the present application, the filter press system further includes:

[0016] A filtrate tank, connected to the liquid outlets of the plurality of plate frames through a filtrate recovery pipeline, and provided with a liquid level meter;

[0017] A gas-liquid separator, the gas inlet is connected to the gas outlet of the plurality of plate frames through an air outlet pipeline, and the liquid return port of the gas-liquid separator is connected to the filtrate tank; wherein

[0018] The controller is electrically connected to the liquid level meter, and is configured to control the air intake process of the plurality of plate frames based on a collected signal of the liquid level meter.

[0019] In the above technical solution, the air intake control process of the gas-liquid separator and the vertical filter press can be optimized, and the automatic control of the entire filter press system can be realized, thereby improving the filtering efficiency.

[0020] According to one embodiment of the present application, the filter press system also includes: an air intake main pipe, the air intake main pipe is connected to the plurality of feed branches through the feed main pipe, a main control valve is provided at one end of the feed main pipe close to the feed branch, the controller is electrically connected to the main control valve, and is configured to control the opening and closing of the main control valve based on the collected signal of the liquid level meter.

[0021] In the above technical solution, by controlling the supply of gas, the risk of excessive drying of the material in the plate frame due to excessive gas supply can be reduced, thereby improving the solid-liquid separation effect of the filter press system and reducing resource waste.

[0022] According to one embodiment of the present application, when the filter press system also includes a feed main pipe, the air intake main pipe provides gas to the plurality of plate frames respectively through the feed main pipe and the plurality of feed branch pipes, and the main control valve is arranged on the feed main pipe.

[0023] In the above technical solution, the feed main pipe and the plurality of feed branch pipes are used as the air intake pipeline, which can simplify the pipeline layout and reduce the complexity of the pipeline.

[0024] According to an embodiment of the present application, the controller is configured to control the air intake process of the plurality of plate frames to stop when it is determined that the liquid level difference of the filtrate tank reaches a target liquid level difference based on a collection signal of the liquid level meter.

[0025] In the above technical solution, the controller automatically adjusts the air intake process according to the real-time liquid level difference data, which can reduce the risk of excessive drying of the material in the plate frame due to excessive gas supply.

[0026] According to one embodiment of the present application, the filtrate recovery pipeline comprises:

[0027] A filtrate recovery branch pipe, wherein the filtrate recovery branch pipe is connected to the liquid outlet of the plate frame;

[0028] A filtrate recovery main pipe is connected between the filtrate recovery branch pipe and the filtrate tank.

[0029] In the above technical solution, the filtrate recovery pipeline can transport the liquid separated during the filtration process to the filtrate tank through the coordinated work of the filtrate recovery main pipe and multiple filtrate recovery branches, thereby optimizing the liquid recovery process and improving the working efficiency of the filtration system.

[0030] According to one embodiment of the present application, the filter press system further includes: an exhaust pipeline, wherein the exhaust pipeline is connected to the gas outlet of the gas-liquid separator.

[0031] In the above technical solution, the exhaust pipeline and the gas-liquid separator work together in the filter pressure system to discharge the gas inside the filter pressure system in a timely and effective manner, thereby improving the stability of the filter pressure system.

[0032] According to one embodiment of the present application, the gas-liquid separator comprises:

[0033] The tank body is provided with an air inlet, an air outlet and a liquid return port;

[0034] The separator is arranged between the air inlet and the air outlet.

[0035] In the above technical solution, the gas-liquid separator mainly separates gas and liquid by gravity or changing the direction of movement, recovers materials, and reduces material waste.

[0036] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0038] Figure 1 It is a structural schematic diagram of the filter press system provided in the embodiment of the present application;

[0039] Figure 2 It is one of the flow charts of the filter press system provided in the embodiment of the present application;

[0040] Figure 3 This is the second flow chart of the filter press system provided in the embodiment of the present application;

[0041] Figure 4 This is the third flow chart of the filter press system provided in the embodiment of the present application;

[0042] Figure 5 It is a schematic diagram of the structure of the gas-liquid separator of the filter press system provided in an embodiment of the present application.

[0043] Reference numerals:

[0044] Filter press system 1;

[0045] Vertical filter press 10, plate frame 110;

[0046] Feed branch pipe 120, branch control valve 121, flow meter 122;

[0047] Feed main pipe 130, main control valve 131, first control valve 132;

[0048] Intake manifold 140, second control valve 141;

[0049] Filtrate tank 20, filtrate recovery pipeline 210, filtrate recovery branch pipe 211, filtrate recovery main pipe 212, liquid level meter 220;

[0050] Gas-liquid separator 30;

[0051] An air outlet pipeline 310, an air outlet main pipe 311, and an air outlet branch pipe 312;

[0052] Exhaust pipe 320;

[0053] Air inlet 331, air outlet 332, liquid return port 333;

[0054] Water washing kettle 40. DETAILED DESCRIPTION

[0055] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0056] In the related art, the vertical automatic filter press is a widely used equipment for separation of solids and liquids. Its working principle is briefly described as follows: the slurry is transported to different plates and frames of the filter press through the feed pipe to form a filter cake with a certain humidity / thickness, and then the filter cake is initially dried through the extrusion / air blowing process. Finally, the filter cake is discharged from both sides of the filter press driven by the driving mechanism to complete the entire filtration cycle. When a vertical filter press is used for positive electrode materials of lithium-ion batteries, the slurry enters the lower plates and frames first during the feeding process because the potential energy of the lower plates and frames is low, resulting in a large feed volume and too thick filter cake. The higher plates and frames have high potential energy, and the weight of the slurry entering the higher plates and frames is small, so the thickness of the resulting filter cake is too thin, and the thickness of the filter cakes of each plate and frame varies greatly. In the existing process, an air blowing process is provided for drying the filter cake, but the related technology ignores the different weights of the materials in each layer of the plate frame, and directly uses the same air blowing time and pressure to dry each layer of the plate frame. This will result in the problem that the moisture content of the filter cake in the lower plate frame is high and the moisture content of the filter cake in the higher plate frame is low due to the different thickness of the filter cake in the plate frame. This may have little impact on other industries, but in the field of positive electrode materials, if filter cake materials with different moisture contents are simultaneously conveyed to the subsequent vibration drying process, uniform drying of the materials cannot be achieved. Since most positive electrode materials are micron or nanometer particles, they are very easy to react with water to generate surface residual alkali, especially ternary materials with high Ni content, which are more likely to react with water. After the battery is made, the content of residual alkali directly affects its capacity, internal resistance, cycle and rate performance. Therefore, how to control the uniformity of the moisture content of each filter cake after washing is one of the key factors in preparing positive electrode materials.

[0057] The present application aims to solve at least one of the technical problems existing in the related art. To this end, the present application proposes a filter press system that can dynamically adjust the moisture content of materials in each plate frame until the moisture content is close.

[0058] Reference below Figure 1-Figure 4 A filter press system 1 according to an embodiment of the present application is described.

[0059] like Figure 1 As shown, the filter press system 1 includes: a water washing kettle 40, a vertical filter press 10 and a controller.

[0060] The water washing kettle 40 is mainly used to hold the material to be filtered, and can wash or remove impurities from the material with water or other solvents, and also plays the role of storage and preliminary treatment. In this embodiment, the material can be a process product of the positive electrode material formed by sintering the precursor of the positive electrode material with a lithium source, additives, etc. The vertical filter press 10 is mainly used for solid-liquid separation, and can separate the liquid and solid by applying pressure.

[0061] The vertical filter press 10 is composed of a plurality of plate frames 110, which are stacked to form a filtering unit. A filtering device for filtering is provided between adjacent plate frames 110. The material to be filtered enters the plate frame 110 and is pressed into the filtering device. The solid remains in the plate frame 110, and the liquid passes through the filtering device and enters the subsequent processing equipment, thereby achieving solid-liquid separation.

[0062] Multiple plate frames 110 are connected to multiple feed branch pipes 120 in a one-to-one correspondence. The plate frames 110 are connected to the outlet of the water washing kettle 40 through the corresponding feed branch pipes 120. The material to be filtered enters the interior of the vertical filter press 10 from the water washing kettle 40 through the feed branch pipes 120. At the same time, each feed branch pipe 120 is provided with a branch control valve 121 and a flow meter 122, wherein the flow meter 122 is located in the middle of the feed branch pipe 120 and may be a mass flow meter 122 for monitoring the quality of the material entering each layer of the plate frames 110. The branch control valve 121 is located at one end of the feed branch pipe 120 connected to the plate frame 110 and is close to the plate frame 110. It may be an automatic ball valve for controlling the quality of the material entering each layer of the plate frames 110.

[0063] The controller is electrically connected to each branch control valve 121 and the flow meter 122, and is configured to control the opening and closing of the branch control valve 121 based on the collected signal of the flow meter 122 when the water washing tank 40 outputs the material to be filtered. In addition, the water washing tank 40 is also provided with a detection device for detecting the quality of the material and pure water entering the water washing tank 40.

[0064] Specifically, the controller can control the opening and closing state of the branch control valve 121 based on the real-time data collected by the flow meter 122. When the water washing tank 40 outputs the material to be filtered to the vertical filter press 10, the branch control valve 121 opens. When the real-time data of the flow meter 122 reaches the preset material amount, the controller controls the corresponding branch control valve 121 to close, thereby realizing precise regulation of the material flow.

[0065] In the filter press system 1 of this structure, the feed branch pipes 120 corresponding to the multiple plate frames 110 are all provided with branch control valves 121 and flow meters 122, and are electrically connected to the controller, so as to achieve precise regulation of the material flow entering the multiple plate frames 110, solve the problem of uneven and uncontrollable moisture content of the filter cakes in each layer of the plate frames 110, and help improve production efficiency and product quality.

[0066] According to the filter press system 1 provided in the embodiment of the present application, the opening and closing of the branch control valve 121 is automatically adjusted by the real-time data collected by the flow meter 122, so that the material flow can be accurately controlled, and the material flow entering the multiple plate frames 110 can be kept stable and evenly distributed, thereby optimizing the solid-liquid separation effect of the filter press system 1 and improving production efficiency and product quality.

[0067] In some embodiments, Figure 1-Figure 3 As shown, the controller is electrically connected to the water washing tank 40, and is configured to determine the amount of material allocated to each plate frame 110 based on the total amount of material in the water washing tank 40 and the number of plates and frames 110 included in the vertical filter press 10, and control the opening and closing of each branch control valve 121 based on the determined amount of material allocated to each plate frame 110 and the collected signal of the flow meter 122.

[0068] like Figure 1 As shown, the vertical filter press 10 is composed of a plurality of plate frames 110, and the plurality of plate frames 110 are connected one by one with a plurality of feed branch pipes 120, and the feed branch pipes 120 are provided with branch control valves 121 and flow meters 122, and the controller is electrically connected to each branch control valve 121 and flow meter 122, and the controller is also electrically connected to the water washing tank 40, and the water washing tank 40 is also provided with a detection device for detecting the quality of the material and pure water entering the water washing tank 40.

[0069] like Figure 3 As shown, in addition, the controller may include a PLC control panel and a data processing module, wherein the PLC control panel includes a real-time monitoring unit and an automatic control unit. The real-time monitoring unit can monitor the feed amount in real time through the flow meter 122, and the automatic control unit controls the feed amount of the plate frame 110 based on the relevant formula through the set PLC system program, so that the feed amounts of multiple plate frames 110 tend to be consistent.

[0070] Specifically, Figure 2 and Figure 4As shown, after the dry material and pure water enter the water washing tank 40, the water washing tank 40 transmits a signal to the controller, and the material mass is m1 (kg), the pure water mass is m2 (kg), and the total material amount in the water washing tank 40 is m1+m2. After the material and pure water are evenly mixed in the water washing tank 40, the material to be filtered in the water washing tank 40 enters the plate frame 110 through the feed branch pipe 120. The number of plate frames 110 included in the vertical filter press 10 is n. The controller is based on the total material amount in the water washing tank 40. The material amount m1+m2 and the number n of plates and frames 110 included in the vertical filter press 10 determine the material amount G allocated to each plate frame 110, satisfying: G=(m1+m2) / n, and then the opening and closing of each branch control valve 121 are controlled based on the determined material amount G allocated to each plate frame 110 and the collected signal of the flow meter 122. When the flow meter 122 on the feed branch pipe 120 detects that the flow reaches the allocated material amount G, the controller controls the corresponding branch control valve 121 to close.

[0071] It can be understood that the controller calculates the material distribution amount of each plate frame 110 based on the total material amount of the water washing kettle 40 and the number of plates and frames 110 of the vertical filter press 10, and then accurately controls the opening and closing of the branch control valve 121 in combination with the feedback signal of the flow meter 122, so as to achieve accurate distribution of material flow, thereby improving the working efficiency and filtering effect of the vertical filter press 10.

[0072] In some embodiments, Figure 1 As shown, the flow meter 122 is arranged in the middle of the feed branch pipe 120 , and the branch control valve 121 is arranged at the end of the feed branch pipe 120 close to the plate frame 110 .

[0073] Installing the flow meter 122 in the middle of the feed branch pipe 120 can more accurately measure the flow rate flowing through the feed branch pipe 120. When the fluid in the feed branch pipe 120 flows evenly, there are local disturbances such as eddies or turbulence near the inlet or outlet of the feed branch pipe 120. The middle of the feed branch pipe 120 helps to obtain more stable and representative flow data, reducing measurement deviations caused by differences in local flow characteristics at both ends of the pipeline.

[0074] By arranging the branch control valve 121 at the end of the feed branch pipe 120 close to the plate frame 110, the feed amount of each plate frame 110 can be adjusted more directly. The branch control valve 121 directly acts on the material flow flowing to the plate frame 110. Being located at the end of the feed branch pipe 120 close to the plate frame 110, the precise control of the local flow can be achieved more quickly, the untimely response of the flow control at the far end of the pipeline can be reduced, and the accuracy of material distribution can be improved.

[0075] It can be understood that when the flow meter 122 is arranged in the middle of the feed branch pipe 120 and the branch control valve 121 is arranged near the end of the plate frame 110, the controller can achieve efficient and uniform material distribution so that each plate frame 110 can receive the same quality of material, thereby improving the overall filtration efficiency and processing capacity.

[0076] In some embodiments, Figure 1 As shown, the filter press system 1 also includes a feed main pipe 130 , and a plurality of feed branch pipes 120 are connected to the outlet of the water washing tank 40 through the feed main pipe 130 .

[0077] The feed main pipe 130 is the main channel in the filter press system 1 that distributes the material flow to multiple feed branch pipes 120. It is connected between the outlet of the water washing tank 40 and the multiple feed branch pipes 120. It is responsible for receiving the material from the water washing tank 40 and evenly distributing it to the multiple feed branch pipes 120 to supply the multiple plate frames 110 that are connected one-to-one with the feed branch pipes 120.

[0078] The feed main pipe 130 is connected to the outlet of the washing kettle 40. A main control valve 131 may be provided on the feed main pipe 130 to control the total material flow entering the feed main pipe 130. At the same time, multiple feed branch pipes 120 are connected to the feed main pipe 130, and multiple feed branch pipes 120 share the flow of the feed main pipe 130. The main control valve 131 helps to balance the flow between the feed main pipe 130 and each feed branch pipe 120.

[0079] In addition, the connection points between the multiple feed branch pipes 120 and the feed main pipe 130 are arranged in sequence and spaced apart along the length direction of the feed main pipe 130. The arrangement direction of the multiple feed branch pipes 120 is the same as the arrangement direction of the multiple plate frames 110. The feed branch pipes 120 are provided with branch control valves 121 for adjusting the material flow received by each plate frame 110 to achieve dynamic control of the material flow.

[0080] It can be understood that the arrangement of the feed main pipe 130 and the plurality of feed branch pipes 120 in the filter press system 1 is conducive to the balanced distribution of the material flow.

[0081] In some embodiments, Figure 1 As shown, the filter press system 1 further includes a filtrate tank 20 and a gas-liquid separator 30 .

[0082] The filtrate tank 20 in the filter press system 1 is mainly used to collect and store the filtrate discharged from the plate frame 110, and can also adjust and optimize the operation of the system through liquid level control. The gas-liquid separator 30 is mainly used to collect materials carried out by the gas.

[0083] Specifically, the filtrate tank 20 is connected to the liquid outlets of multiple plate frames 110 through a filtrate recovery pipeline 210, and the water washing kettle 40 is connected to the liquid inlets of multiple plate frames 110 through a feed pipeline. The material to be filtered enters the plate frame 110 through the feed pipeline and is filtered. The solid filter cake remains in the plate frame 110, and the liquid filtrate enters the filtrate tank 20 through the filtrate recovery pipeline 210. A liquid level meter 220 is provided in the filtrate tank 20 to monitor the liquid level in the tank in real time. When the liquid level is too high, the filter pressure system 1 can discharge or transfer the collected filtrate to the processing unit through a valve or a pump.

[0084] In addition, the air inlet 331 of the gas-liquid separator 30 is connected to the air outlet 332 of the multiple plate frames 110 through the air outlet pipeline 310. The air outlet pipeline 310 includes an air outlet main pipe 311 and multiple air outlet branch pipes 312. The multiple air outlet branch pipes 312 are connected to the air outlets 332 of the multiple plate frames 110 in a one-to-one correspondence. The air outlet main pipe 311 is connected between the air outlet branch pipes 312 and the air inlet 331 of the gas-liquid separator 30. The liquid return port 333 of the gas-liquid separator 30 is connected to the filtrate tank 20.

[0085] After the material is filtered, the filter cake in the plate frame 110 is blown with air to dry the filter cake. The gas can be provided by a compressor or other gas production equipment. The mixed gas passing through the plate frame 110 carries moisture and some small material particles. The mixed gas enters the gas-liquid separator 30 horizontally from the air inlet 331 through the air outlet pipeline 310.

[0086] like Figure 5 As shown, after entering the gas-liquid separator 30, the mixed gas passes through a circle of circular baffles preset in the center of the gas-liquid separator 30, and the direction of the mixed gas changes by 90°, and becomes vertically downward movement. Through the sudden turn of the high-speed moving mixed gas, most of the water and material particles in the mixed gas are separated, and then the mixed gas bypasses the circular baffle and turns 180° to move upward. In this process, part of the water and material particles are separated again. Finally, the mixed gas passes through several layers of stainless steel corrugated packing to separate the water and material particles in the mixed gas again. After three separations, a better separation effect can be achieved. The separated gas is discharged through the gas outlet 332 above the gas-liquid separator 30, and the separated water and material particle mixture is liquefied and enters the filtrate tank 20 through the liquid return port 333 below the gas-liquid separator 30.

[0087] In addition, the controller is electrically connected to the liquid level meter 220 in the filtrate tank 20, and is configured to control the air intake process of the plurality of plate frames 110 based on the collected signal of the liquid level meter 220, such as Figure 3As shown, the controller may include a PLC control panel and a data processing module, wherein the PLC control panel includes a real-time monitoring unit and an automatic control unit, the real-time monitoring unit may monitor the liquid level in the filtrate tank 20 in real time through a liquid level meter 220, and the automatic control unit may control the moisture mean of the plate frame 110 based on a relevant formula through a set PLC system program, so that the moisture mean values ​​of multiple plate frames 110 tend to be consistent.

[0088] Specifically, the mass of the material entering the water washing tank 40 is m1 (kg), the mass of the pure water entering the water washing tank 40 is m2 (kg), the liquid level difference of the filtrate tank 20 is H (mm), the cross-sectional radius of the bottom of the filtrate tank 20 is R (mm), and the density of pure water is ρ (g / cm 3 ), the average moisture value of the plate frame 110 is Y, which satisfies: Y=(m2-H*πR 2 *ρ) / m1*100%, after the average moisture value Y of the plate frame 110 calculated by the liquid level difference H of the filtrate tank 20 reaches a preset value, the air intake process is ended.

[0089] It is understandable that, through the real-time linkage between the liquid level meter 220 and the controller, the air intake control process of the gas-liquid separator 30 and the vertical filter press 10 can be optimized, and the automatic control of the entire filter press system 1 can be achieved, thereby improving the filtration efficiency.

[0090] In some embodiments, Figure 2 As shown, the filter press system 1 also includes an air intake manifold 140, which is connected to multiple feed branches through a feed manifold. A main control valve is provided at one end of the feed manifold close to the feed branch. The controller is electrically connected to the main control valve 131 and is configured to control the opening and closing of the main control valve 131 based on the collected signal of the liquid level meter 220.

[0091] The water washing kettle 40 is usually used for cleaning materials. The gas can be provided by a compressor or other gas producing equipment. The air intake manifold 140 is connected between the gas producing equipment and the feed manifold 130. The gas can enter the vertical filter press 10 through the air intake manifold 140 and the feed manifold 130 in turn to perform an air blowing process. At the same time, a first control valve 132 is provided at the outlet of the water washing kettle 40, and a second control valve 141 is provided on the air intake manifold 140. The process of air intake and liquid intake can be controlled by switching the opening and closing states of different control valves.

[0092] Exemplarily, multiple plate frames 110 are connected to multiple feed branch pipes 120 in a one-to-one correspondence. The feed branch pipes 120 are connected to the outlet of the water washing kettle 40 through the feed main pipe 130. The material to be filtered enters the plate frame 110 from the water washing kettle 40 through the feed branch pipes 120. The feed branch pipes 120 can also be connected to the air intake main pipe 140 through the feed main pipe 130. The gas enters the plate frame 110 from the air intake main pipe 140 through the feed branch pipes 120.

[0093] In addition, a main control valve 131 is provided on the feed main pipe 130, which can be used to control the gas and liquid intake processes. The controller is electrically connected to the main control valve 131, and can automatically control the opening and closing of the main control valve 131 according to the signal collected by the liquid level meter 220, thereby realizing precise gas supply management.

[0094] Specifically, the liquid level difference H of the filtrate tank 20 is obtained according to the information collected by the liquid level meter 220, and then the average moisture value Y of the plate frame 110 is calculated through the liquid level difference H of the filtrate tank 20. After the average moisture value Y of the plate frame 110 reaches a preset value, the controller closes the main control valve 131 to end the air intake process.

[0095] It is understandable that by controlling the gas supply, the risk of excessive drying of the material in the plate frame 110 due to excessive gas supply can be reduced, thereby improving the solid-liquid separation effect of the filter press system 1 and reducing resource waste.

[0096] In some embodiments, when the filter press system 1 also includes a feed main pipe 130 , the air intake main pipe 140 provides gas to the multiple plate frames 110 respectively through the feed main pipe 130 and multiple feed branch pipes 120 , and the main control valve 131 is arranged on the feed main pipe 130 .

[0097] When the filter press system 1 also includes a feed main pipe 130, the feed main pipe 130 and multiple feed branch pipes 120 can also be used as an air intake pipeline, thereby simplifying the pipeline layout and reducing the complexity of the pipeline. The gas enters the feed main pipe 130 from the air intake main pipe 140, and then enters the multiple plate frames 110 through the multiple feed branch pipes 120, thereby realizing the air blowing process.

[0098] Meanwhile, a second control valve 141 is provided on the intake manifold 140 , and the second control valve 141 is electrically connected to the controller. The second control valve 141 is opened when the intake starts, and is closed when the intake ends.

[0099] In addition, a main control valve 131 is provided on the end of the feed main pipe 130 near the feed branch pipe 120, which can be used to control the gas or liquid intake process. The controller is electrically connected to the main control valve 131, and can automatically control the opening and closing of the main control valve 131 according to the signal collected by the liquid level meter 220, thereby realizing precise gas supply management.

[0100] It can be understood that using the feed main pipe 130 and multiple feed branch pipes 120 as the intake pipeline can simplify the pipeline layout and reduce the complexity of the pipeline.

[0101] In some embodiments, the controller is configured to control the air intake process of the plurality of plate frames 110 to stop when it is determined that the liquid level difference of the filtrate tank 20 reaches the target liquid level difference based on the collected signal of the liquid level meter 220 .

[0102] A main control valve 131 is provided on the feed main pipe 130 for controlling the air intake process. The controller is electrically connected to the main control valve 131 and can automatically control the opening and closing of the main control valve 131 according to the signal collected by the liquid level meter 220 to achieve precise gas supply management.

[0103] The liquid level difference refers to the change in the liquid level height inside the filtrate tank 20 during the air intake process. The progress of the filtration process can be inferred by real-time monitoring of the liquid level difference. When the liquid level difference reaches the preset target value, the material in the filter press system 1 has been fully dried and the air intake can be stopped according to the set conditions.

[0104] Specifically, the corresponding liquid level difference H of the filtrate tank 20 can be obtained through the preset plate frame 110 moisture average value Y. When it is determined that the liquid level difference of the filtrate tank 20 reaches the target liquid level difference according to the collected signal of the liquid level meter 220, the controller closes the main control valve 131 to end the air intake process.

[0105] It is understandable that the controller automatically adjusts the air intake process according to the real-time liquid level difference data, which can reduce the risk of excessive drying of the material in the plate frame 110 due to excessive gas supply.

[0106] In some embodiments, Figure 1 As shown, the filtrate recovery pipeline 210 includes: a filtrate recovery main pipe 212 and multiple filtrate recovery branches 211, the filtrate recovery branches 211 are connected to the liquid outlet of the plate frame 110, and the filtrate recovery main pipe 212 is connected between the filtrate recovery branch pipes 211 and the filtrate tank 20.

[0107] The filtrate tank 20 is connected to the liquid outlets of multiple plate frames 110 through a filtrate recovery pipeline 210. The filtrate recovery pipeline 210 includes a filtrate recovery main pipe 212 and multiple filtrate recovery branch pipes 211, wherein the filtrate recovery main pipe 212 is connected between the multiple filtrate recovery branch pipes 211 and the filtrate tank 20, and is used to collect the liquid transported by the multiple filtrate recovery branch pipes 211 and transport it to the filtrate tank 20 for storage or further processing. The filtrate recovery branch pipes 211 are connected between the filtrate recovery main pipe 212 and the liquid outlet of the plate frame 110, and the multiple filtrate recovery branch pipes 211 are connected to the liquid outlets of the multiple plate frames 110 one by one.

[0108] During the filter pressing process of the plate frame 110, the material to be filtered enters the plate frame 110 through the feed pipeline and is filtered, the solid filter cake remains in the plate frame 110, and the liquid filtrate enters the filtrate tank 20 through the filtrate recovery pipeline 210. The filtrate tank 20 is provided with a liquid level meter 220 to monitor the liquid level in the tank in real time.

[0109] It can be understood that the filtrate recovery pipeline 210 can transport the liquid separated during the filtration process to the filtrate tank 20 through the coordinated work of the filtrate recovery main pipe 212 and multiple filtrate recovery branches 211, thereby optimizing the liquid recovery process and improving the working efficiency of the filtration system 1.

[0110] In some embodiments, Figure 1 As shown, the filter press system 1 further includes an exhaust pipeline 320 , and the exhaust pipeline 320 is connected to the gas outlet 332 of the gas-liquid separator 30 .

[0111] During the operation of the filter press system 1, the mixed gas after the air blowing process can enter the gas-liquid separator 30 through the air inlet 331 for subsequent processing. The mixed gas carrying moisture and small particle materials passes through the gas-liquid separator 30 and is discharged from the gas outlet 332 of the gas-liquid separator 30 through the exhaust pipe 320. At this time, the gas is dried in the gas-liquid separator 30 and separated from the small particle materials, but it is not pure dry decarbonized gas and is not reused.

[0112] In the filter press system 1, the exhaust pipe 320 is mainly used to discharge the gas after work in time, which helps the filter press system 1 to work under a stable pressure and reduce the risk of equipment overload in the filter press system 1. The exhaust pipe 320 can be connected to other exhaust gas treatment equipment or directly connected to the atmosphere.

[0113] It is understandable that the exhaust pipe 320 and the gas-liquid separator 30 work together in the filter press system 1 to discharge the gas inside the filter press system 1 in a timely and effective manner, thereby improving the stability of the filter press system 1.

[0114] In some embodiments, Figure 1 As shown, the gas-liquid separator 30 includes a tank body and a separator. The tank body is provided with an air inlet 331 , an air outlet 332 and a liquid return port 333 , and the separator is provided between the air inlet 331 and the air outlet 332 .

[0115] The tank body is the outer container of the gas-liquid separator 30, which is usually made of metal or other corrosion-resistant materials and can withstand the internal pressure and gas-liquid flow. The tank body is provided with an air inlet 331, an air outlet 332 and a liquid return port 333, wherein the air inlet 331 is located on the side of the tank body and is connected to the air outlet 332 of multiple plate frames 110 through the air outlet pipeline 310, the air outlet 332 is located at the top of the tank body and is connected to the exhaust pipeline 320, and the liquid return port 333 is located at the bottom of the tank body and is connected to the filtrate tank 20.

[0116] The separator is a core component inside the gas-liquid separator 30 and has a complex structural form, such as a filter and a baffle. The separator is located between the air inlet 331 and the air outlet 332 and is responsible for separating the moisture and some small material particles in the mixed gas.

[0117] Specifically, a circle of circular baffles may be preset in the center of the separator, and several layers of stainless steel corrugated packing are arranged above the circular baffles.

[0118] The mixed gas carrying moisture and some small material particles enters the gas-liquid separator 30 horizontally from the air inlet 331 through the air outlet pipeline 310, and then passes through a circle of circular baffles preset in the center of the gas-liquid separator 30. The direction of the mixed gas changes by 90° and becomes vertical downward movement. The sudden turn of the high-speed moving mixed gas separates most of the moisture and material particles in the mixed gas. Then the mixed gas bypasses the circular baffle and turns 180° to move upward. In this process, part of the moisture and material particles are separated again. Finally, the mixed gas passes through several layers of stainless steel corrugated packing to separate the moisture and material particles in the mixed gas again. After three separations, a better separation effect can be achieved. The separated gas is discharged through the air outlet 332 above the gas-liquid separator 30, and the separated moisture and material particle mixture is liquefied and enters the filtrate tank 20 through the liquid return port 333 below the gas-liquid separator 30.

[0119] It can be understood that the gas-liquid separator 30 mainly separates gas and liquid by gravity or changing the direction of movement, recovers materials, and reduces material waste.

[0120] The present application also discloses a control method based on the filter press system 1, the control method comprising: steps 510 to 530;

[0121] Step 510: during the feeding process, obtaining the feed flow rate of each feed branch pipe 120;

[0122] Step 520: When the feed flow rate of any plate frame 110 reaches the first target value, the controller controls the corresponding feed branch pipe 120 to stop feeding;

[0123] Step 530: When all feed branch pipes 120 stop feeding, control the vertical filter press 10 to start extrusion.

[0124] Preferably, multiple plate frames 110 are connected to multiple feed branch pipes 120 in a one-to-one correspondence, and each feed branch pipe 120 is provided with a branch control valve 121 and a flow meter 122. The flow meter 122 is used to obtain the feed flow of each feed branch pipe 120 and transmit the data to the controller. The branch control valve 121 is used to control the quality of the material entering each layer of the plate frame 110.

[0125] Furthermore, the flow meter 122 is located in the middle of the feed branch pipe 120 , and the branch control valve 121 is located at one end of the feed branch pipe 120 connected to the plate frame 110 and is close to the plate frame 110 .

[0126] Furthermore, the flow meter 122 is a mass flow meter, and the branch control valve 121 is an automatic ball valve.

[0127] Preferably, when the feed flow rate reaches the first target value, the controller controls the branch control valve 121 on the corresponding feed branch pipe 120 to close, so that the feed branch pipe 120 stops feeding.

[0128] Preferably, the method for determining the first target value comprises the following steps:

[0129] 1. Determine the total amount of material to be filtered based on the amount of dry material and pure water entering the water washing kettle 40;

[0130] 2. Based on the total amount of material and the number of plates and frames 110 included in the vertical filter press 10, determine the amount of material evenly distributed to each plate and frame 110;

[0131] 3. Determine a first target value based on the amount of material allocated to each plate frame 110 .

[0132] Preferably, the total amount of material to be filtered in step 1 is determined as follows: when the dry material and pure water enter the water washing kettle 40, the water washing kettle 40 transmits a signal to the controller, and the material mass is obtained as m1 (kg), the pure water mass is m2 (kg), and the total amount of material to be filtered is determined as m1+m2.

[0133] Preferably, in step 2, the amount of material evenly distributed to each plate frame 110 is determined as follows: the total amount of material to be filtered is m1+m2, the number of plates and frames 110 included in the vertical filter press 10 is n, and the amount of material G distributed to each plate frame 110 can be determined by the formula: G=(m1+m2) / n.

[0134] Preferably, there may be a certain error between the first target value in step 3 and the material amount G allocated to each plate frame 110, and the error is limited to a certain range.

[0135] The controller can control the opening and closing of each branch control valve 121 based on the determined material quantity G allocated to each plate frame 110 and the collected signal of the flow meter 122. When the flow meter 122 on the feed branch pipe 120 detects that the flow reaches the first target value, the controller controls the corresponding branch control valve 121 to close.

[0136] Preferably, the control method further includes: Step 540-Step 560:

[0137] Step 540, after the vertical filter press 10 has completed extrusion, blowing air toward the plate frame 110;

[0138] Step 550, during the process of blowing air toward the plate frame 110, obtaining the liquid level value of the filtrate tank 20;

[0139] Step 560: When the liquid level value of the filtrate tank 20 reaches the second target value, the air intake process is controlled to stop.

[0140] Preferably, during the operation of the vertical filter press 10, the material to be filtered is subjected to a filtering process in the plate frame 110. After the filtering is completed, the solid material remains in the plate frame 110, and the liquid material enters the filtrate tank 20 through the filtrate recovery pipeline 210. Then, the gas in the air intake manifold 140 enters the plate frame 110 through the feed pipeline, and an air blowing process is performed to further dry the solid material in the plate frame 110. After the air blowing is completed, the mixed gas carries moisture and some small material particles. The mixed gas enters the gas-liquid separator 30 horizontally from the air inlet 331 through the air outlet pipeline 310.

[0141] During the process of blowing air toward the plate frame 110, the mixed gas carrying moisture and some small material particles passes through the gas-liquid separator 30, and a part of the material is liquefied and enters the filtrate tank 20. At this time, the liquid level value of the filtrate tank 20 is rising. The controller is configured to control the air intake process of multiple plate frames 110 to stop when it is determined that the liquid level difference H of the filtrate tank 20 reaches the target liquid level difference based on the acquisition signal of the liquid level meter 220.

[0142] Preferably, in step 550 , a liquid level meter 220 for detecting a liquid level difference H in the filtrate tank 20 is provided in the filtrate tank 20 .

[0143] Preferably, in step 560 , the controller determines based on the liquid level difference H that when H reaches the second target value, the air intake process of the plurality of plate frames 110 is stopped.

[0144] Preferably, the second target value is confirmed according to a planned discharge moisture content standard.

[0145] Specifically, the mass of the material entering the water washing tank 40 is set to m1 (kg), the mass of the pure water entering the water washing tank 40 is m2 (kg), the liquid level difference of the filtrate tank 20 is H (mm), the cross-sectional radius of the bottom of the filtrate tank 20 is R (mm), and the density of pure water is ρ (g / cm 3 ), can be obtained by Y = (m2-H*πR 2 *ρ) / m1*100% to obtain the average moisture value of the plate frame 110 is Y.

[0146] Preferably, there may be a certain error between the second target value and the corresponding liquid level value of the filtrate tank 20 at this time, and the error is limited to a certain range.

[0147] After the liquid level value of the filtrate tank 20 reaches the second target value, the controller ends the air intake process.

[0148] The embodiments of the present application are described in detail below.

[0149] like Figure 1As shown, in this embodiment, the filter press system 1 includes: a water washing tank 40, a vertical filter press 10 and a controller. The water washing tank 40 is used to hold the material to be filtered. The vertical filter press 10 includes a plurality of plate frames 110. The plurality of plate frames 110 are respectively connected to a feed main pipe 130 through a plurality of corresponding feed branch pipes 120. The feed main pipe 130 is connected to the outlet of the water washing tank 40, and a branch control valve 121 is provided at the end of the plurality of feed branch pipes 120 close to the plate frame 110. A flow meter 122 is provided in the middle of the plurality of feed branch pipes 120. The controller is electrically connected to the branch control valve 121 and the flow meter 122, and is configured to control the opening and closing of the branch control valve 121 based on the collected signal of the flow meter 122 when the water washing tank 40 outputs the material to be filtered.

[0150] Specifically, the controller is electrically connected to the water washing tank 40, and is configured to determine the amount of material G allocated to each plate frame 110 based on the total material amount m1+m2 of the water washing tank 40 and the number n of plates and frames 110 included in the vertical filter press 10, G=(m1+m2) / n, and control the opening and closing of each branch control valve 121 based on the determined amount of material G allocated to each plate frame 110 and the collected signal of the flow meter 122. When the flow meter 122 on the feed branch pipe 120 detects that the flow reaches the allocated material amount G, the controller controls the corresponding branch control valve 121 to close.

[0151] Exemplarily, the ternary positive electrode material and pure water are mixed in a water washing kettle 40 to form a material to be filtered. The material to be filtered enters the multiple plates and frames 110 in turn through the feed main pipe 130 and the multiple feed branch pipes 120. The number n of plates and frames 110 included in the vertical filter press 10 is set to n=14. The mass m1 (kg) of the material and the mass m2 (kg) of the pure water entering the water washing kettle 40 are recorded. The theoretical preset threshold G1 is obtained by G=(m1+m2) / n, and then compared with the recorded actual plate and frame 110 preset threshold G2. The error between the two is obtained by △G=G1-G2.

[0152] Table 1

[0153]

[0154] Referring to Table 1, △G is between -2 and 2. The error between the calculated theoretical preset threshold value G1 of the feed amount in each layer of the plate frame 110 and the preset threshold value G2 of the feed amount in actual production is very small, that is, the thickness of the material after filtration can be made the same by controlling the amount of material G entering each layer of the plate frame 110.

[0155] The vertical filter press 10 also includes a filtrate tank 20 and a gas-liquid separator 30. The filtrate tank 20 is connected to the liquid outlets of the multiple plate frames 110 through a filtrate recovery pipeline 210, and is provided with a liquid level meter 220, wherein the liquid level meter 220 is electrically connected to the controller, and the controller is configured to control the air intake process of the multiple plate frames 110 based on the collection signal of the liquid level meter 220.

[0156] During the operation of the vertical filter press 10, the material to be filtered in the washing kettle 40 enters the plate frame 110 through the feed pipeline for a filtration process. After the filtration is completed, the solid material remains in the plate frame 110, and the liquid material enters the filtrate tank 20 through the filtrate recovery pipeline 210. Then, the gas in the air intake manifold 140 enters the plate frame 110 through the feed pipeline for an air blowing process to further dry the material in the plate frame 110. After the air blowing, the mixed gas carries moisture and some small material particles. The mixed gas enters the gas-liquid separator 30 horizontally from the air inlet 331 through the air outlet pipeline 310.

[0157] The filtrate recovery pipeline 210 includes a filtrate recovery main pipe 212 and multiple filtrate recovery branch pipes 211. The multiple filtrate recovery branch pipes 211 are connected to the liquid outlets of multiple plate frames 110 in a one-to-one correspondence. The filtrate recovery main pipe 212 is connected between the filtrate recovery branch pipes 211 and the filtrate tank 20.

[0158] The gas-liquid separator 30 includes a tank body and a separator, the tank body is provided with an air inlet 331, an air outlet 332 and a liquid return port 333, the separator is arranged between the air inlet 331 and the air outlet 332, wherein the air inlet 331 is located on the side of the tank body, and is connected to the air outlet 332 of multiple plate frames 110 through the air outlet pipeline 310, the air outlet 332 is located at the top of the tank body, and is connected to the exhaust pipeline 320, and the liquid return port 333 is located at the bottom of the tank body, and is connected to the filtrate tank 20.

[0159] The filter press system 1 also includes an air intake main pipe 140, which is connected to multiple feed branch pipes 120 through a feed main pipe 130. A main control valve 131 is provided at one end of the feed main pipe 130 close to the feed branch pipe 120. The controller is electrically connected to the main control valve 131 and is configured to control the opening and closing of the main control valve 131 based on the collected signal of the liquid level meter 220.

[0160] Specifically, the controller is configured to control the air intake process of the plurality of plate frames 110 to stop when it is determined based on the collected signal of the liquid level meter 220 that the liquid level difference H of the filtrate tank 20 reaches the target liquid level difference, and set the mass of the material entering the water washing kettle 40 to m1 (kg), the mass of the pure water entering the water washing kettle 40 to m2 (kg), the liquid level difference of the filtrate tank 20 to H (mm), the cross-sectional radius of the bottom of the filtrate tank 20 to R (mm), and the density of the pure water to ρ (g / cm 3 ), can be obtained by Y = (m2-H*πR 2*ρ) / m1*100% to obtain the average moisture value of the plate frame 110 as Y. When the average moisture value Y of the plate frame 110 calculated by the liquid level difference H of the filtrate tank 20 reaches a preset value, the air intake process is terminated.

[0161] Exemplarily, the ternary positive electrode material and pure water are mixed in the water washing kettle 40 to form a material to be filtered, and the material to be filtered enters the multiple plate frames 110 through the feed main pipe 130 and the multiple feed branch pipes 120 in sequence. The number n of the plate frames 110 included in the vertical filter press 10 is set to n=14. At this time, the mass of the material entering the water washing kettle 40 is m1=1500kg, the mass of the pure water entering the water washing kettle 40 is m2=600kg, the radius of the filtrate tank 20 is R=510mm, and the density of pure water is ρ=1g / cm 3 , the target moisture mean value Y1 of the plate frame 110 is calculated and compared with the recorded actual moisture mean value Y2 of the plate frame 110, and the error between the two is obtained by △Y=Y1-Y2.

[0162] Table 2

[0163]

[0164] Referring to Table 2, △Y is between -0.4% and 0.2%. The error between the calculated target moisture mean Y1 of the plate frame 110 and the actual moisture mean Y2 of the plate frame 110 in actual production is very small, that is, the moisture mean Y of the plate frame 110 can be controlled by the liquid level difference H of the filtrate tank 20.

[0165] The terms "first", "second", etc. in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0166] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0167] In the description of this application, "first feature" or "second feature" may include one or more of the features.

[0168] In the description of the present application, “plurality” means two or more.

[0169] In the description of the present application, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0170] In the description of the present application, “above”, “over” and “above” a first feature to a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0171] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0172] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A filter press system, characterized in that: include: The water washing kettle is used to hold the materials to be filtered; A vertical filter press comprises a plurality of plate frames, wherein the plurality of plate frames are respectively connected to the outlet of the water washing kettle through corresponding feed branch pipes, and the plurality of feed branch pipes are each provided with a branch control valve and a flow meter; The controller is electrically connected to the branch control valve and the flow meter, and is configured to control the opening and closing of the branch control valve based on the collected signal of the flow meter when the water washing kettle outputs the material to be filtered.

2. The filter press system according to claim 1, characterized in that: The controller is electrically connected to the water washing tank, and is configured to determine the amount of material allocated to each plate frame based on the total amount of material in the water washing tank and the number of plates and frames included in the vertical filter press, and control the opening and closing of each branch control valve based on the determined amount of material allocated to each plate frame and the collected signal of the flow meter.

3. The filter press system according to claim 1, characterized in that: The flow meter is arranged in the middle of the feed branch pipe, and the branch control valve is arranged at the end of the feed branch pipe close to the plate frame.

4. The filter press system according to claim 1, characterized in that: Also includes: A feed main pipe, wherein the plurality of feed branch pipes are connected to the outlet of the water washing kettle through the feed main pipe.

5. The filter press system according to any one of claims 1 to 4, characterized in that: Also includes: A filtrate tank, connected to the liquid outlets of the plurality of plate frames through a filtrate recovery pipeline, and provided with a liquid level meter; A gas-liquid separator, the gas inlet of which is connected to the gas outlets of the plurality of plate frames through a gas outlet pipeline, and the liquid return port of the gas-liquid separator is connected to the filtrate tank; in The controller is electrically connected to the liquid level meter, and is configured to control the air intake process of the plurality of plate frames based on a collected signal of the liquid level meter.

6. The filter press system according to claim 5, characterized in that: Also includes: An air intake main pipe, wherein the air intake main pipe is connected to a plurality of the feed branch pipes through the feed main pipe, a main control valve is provided at one end of the feed main pipe close to the feed branch pipe, and the controller is electrically connected to the main control valve and is configured to control the opening and closing of the main control valve based on the collected signal of the liquid level meter.

7. The filter press system according to claim 6, characterized in that: In the case where the filter press system further includes a feed main pipe, the gas intake main pipe provides gas to the plurality of plate frames respectively through the feed main pipe and the plurality of feed branch pipes, and the main control valve is arranged on the feed main pipe.

8. The filter press system according to claim 5, characterized in that: The controller is configured to control the air intake process of the plurality of plate frames to stop when it is determined that the liquid level difference of the filtrate tank reaches a target liquid level difference based on the collected signal of the liquid level meter.

9. The filter press system according to claim 5, characterized in that: The filtrate recovery pipeline comprises: A filtrate recovery branch pipe, wherein the filtrate recovery branch pipe is connected to the liquid outlet of the plate frame; A filtrate recovery main pipe is connected between the filtrate recovery branch pipe and the filtrate tank.

10. The filter press system according to claim 5, characterized in that: Also includes: An exhaust pipeline is connected to the gas outlet of the gas-liquid separator.

11. The filter press system according to claim 5, characterized in that: The gas-liquid separator comprises: The tank body is provided with an air inlet, an air outlet and a liquid return port; The separator is arranged between the air inlet and the air outlet.

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