Plate-and-frame filter press cleaning system and method

Abstract

The invention relates to the technical field of filter press cleaning and discloses a plate-and-frame filter press cleaning system.The plate-and-frame filter press cleaning system comprises a spraying device, a sensor assembly, a control system and a sewage collecting tank, dirt and filtering resistance on the surface of filter cloth are detected through the sensor assembly, and the control system adjusts the working state of the spraying device according to sensor signals; according to the plate-and-frame filter press, the filter cloth of the plate-and-frame filter press is washed by the spraying device, and sewage generated by washing enters the sewage collecting tank for treatment, so that the working efficiency of the plate-and-frame filter press is improved, the efficiency reduction and manual cleaning requirements caused by blockage of the filter cloth are reduced, and the labor cost is reduced; the invention further provides a plate-and-frame filter press cleaning method, infrared thickness detection and pressure change rate two parameters are fused, the defect of a single sensor is avoided, the anti-interference capacity of the system is remarkably improved, cleaning is triggered based on the dirt index threshold value, cleaning is more timely and effective, and the service life of filter cloth and the service life of whole equipment are prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of filter press cleaning, and in particular to a plate and frame filter press cleaning system and method. Background Art

[0002] In steel companies' water treatment processes, plate and frame filter presses are often used for sludge dewatering. Their operating principle is based on a combination of pressure filtration and filter cloth retention. Mechanical pressure forces the liquid in a suspension to pass through the filter cloth, while solid particles are retained, achieving solid-liquid separation. However, solid particles and impurities in the sludge tend to adhere to the filter cloth, resulting in reduced filtration efficiency and even equipment failure.

[0003] Traditional manual cleaning methods are not only time-consuming and labor-intensive, but also ineffective, impacting production efficiency and water quality. Some existing automated cleaning devices suffer from issues such as insufficient sensor accuracy, incomplete spray coverage, and low wastewater recycling rates.

[0004] Therefore, there is an urgent need for a cleaning system that integrates sensing, precise control and resource recycling to improve the operating efficiency and service life of the plate and frame filter press. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a plate and frame filter press cleaning system and method. The system detects the dirt thickness and filtration resistance on the filter cloth surface through a sensor component. Based on dual-parameter sensing, dynamic adjustment and recycling technology, the system achieves efficient cleaning of the filter cloth, reduces manual intervention, extends equipment life, and reduces water treatment costs.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: In a first aspect, a plate and frame filter press cleaning system is provided, comprising a spray device, a sensor assembly, a control system, and a sewage collection tank, wherein the sewage collection tank is disposed below the plate and frame filter press, the spray device comprises a spray pipe installed above the plate and frame filter press, and the spray pipe is provided with a plurality of spray holes; The sensor assembly includes an infrared sensor for detecting the thickness of dirt on the filter cloth surface and a pressure sensor for monitoring changes in filtration resistance; the control system is electrically connected to the spray device and the sensor assembly, and the control system is used to receive sensor signals and control the working state of the spray device.

[0007] Optionally, the sewage collection tank includes a tank body, the tank body is provided with an inclined guide surface and a filtering structure, and the bottom of the tank body is connected to a sewage pump.

[0008] Optionally, the output end of the sewage pump is connected to a circulating water treatment unit for recycling clean wastewater, and the output end of the circulating water treatment unit is connected to the input end of the spraying device.

[0009] Optionally, the plurality of spray holes are distributed in a matrix, and the distance between two adjacent spray holes is 20-30 cm.

[0010] In a second aspect, a plate-frame filter press cleaning method is provided, which uses the plate-frame filter press cleaning system described in the first aspect, comprising the following steps: S1. Real-time detection of filter cloth status: using infrared sensors to detect the thickness of dirt on the filter cloth surface, and using pressure sensors to monitor changes in resistance during filtration, and integrating the two data to generate a dirt index. S2. Trigger cleaning condition judgment. The control system presets a dirt thickness threshold and a pressure change threshold. When the dirt index exceeds the preset threshold, the cleaning program is triggered; S3, dynamically adjusting the spray parameters, according to the dirt index in step S1, adjusting the spray pressure, spray time and pulse frequency of the spray device through the control system to flush the filter cloth of the plate and frame filter press; S4, sewage collection and treatment, the sewage generated by flushing is filtered through the inclined sewage collection tank for large particle impurities, and then enters the circulating water treatment unit to achieve wastewater reuse; S5. After cleaning, the spray device starts the reverse flushing process to remove the residual impurities in the spray pipe.

[0011] Optionally, in step S1, the detection accuracy of the infrared sensor is ±0.1 mm, and the detection frequency of the pressure sensor is 1 time / minute. The data of the two are fused by a weighted algorithm to calculate the dirt index. The formula is: S=a·T+b·ΔP Where S is the dirt index, T is the dirt thickness detected by the infrared sensor, ΔP is the pressure change rate, a and b are weight coefficients, and a + b = 1.

[0012] Optionally, in step S3, the spray pressure range of the spray device is 5-10 MPa. When the dirt index is ≤1 mm, continuous flushing is performed at 5-8 MPa; when the dirt index is greater than 1 mm, pulse flushing is performed at 8-10 MPa, with a pulse interval of 1-3 seconds.

[0013] Optionally, in step S4, the slope of the inclined guide surface of the sewage collection tank is ≥5°, and the collected wastewater is recycled to the spraying device after treatment.

[0014] Compared with the prior art, the present invention has the following beneficial effects: (1) In the present invention, a sensor assembly is used to detect dirt and filtration resistance on the surface of the filter cloth. The control system adjusts the working state of the spray device according to the sensor signal. The spray device then flushes the filter cloth of the plate and frame filter press. The wastewater generated by the flushing enters the wastewater collection tank for treatment, thereby improving the working efficiency of the plate and frame filter press, reducing the efficiency drop caused by filter cloth clogging and the need for manual cleaning, and reducing labor costs. (2) In the present invention, under the action of the circulating water treatment unit, the wastewater can be reused in the spraying device after treatment to continue the flushing work, thereby improving the effect of sewage treatment, contributing to environmental protection, and reducing water treatment costs; (3) Compared with the traditional timed cleaning or single parameter triggering, the cleaning method of the present invention integrates the dual parameters of infrared thickness detection and pressure change rate, avoids the defects of a single sensor, significantly improves the anti-interference ability of the system, and triggers cleaning based on the dirt index threshold, making cleaning more timely and effective, and extending the service life of the filter cloth and the overall equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 2. It is a schematic structural diagram of a plate and frame filter press cleaning system according to an embodiment of the present invention; Figure 2 2 is a schematic structural diagram of a sewage collection tank according to an embodiment of the present invention; Figure 3 Schematic diagram of the connection relationship between the spray device and the circulating water treatment unit in an embodiment of the present invention; Figure 4 1 is a flow chart of a plate and frame filter press cleaning method according to an embodiment of the present invention; Among them, 1. Plate and frame filter press; 2. Spray device; 201. Spray pipe; 202. Spray hole; 3. Sensor assembly; 4. Sewage collection tank; 401. Tank body; 402. Filter structure. DETAILED DESCRIPTION

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention. Example 1

[0017] like Figure 1-Figure 3 As shown, a plate and frame filter press cleaning system includes a spray device 2, a sensor component 3, a control system, a sewage collection tank 4 and a circulating water treatment unit.

[0018] The spray device 2 is installed above the plate and frame filter press 1 for flushing the filter cloth of the plate and frame filter press 1 ; the sewage collection tank 4 is installed below the plate and frame filter press 1 for collecting the sewage generated after the spray device 2 flushes the filter cloth.

[0019] The sensor assembly 3 includes an infrared sensor and a pressure sensor. The infrared sensor is installed on the outside of the plate and frame filter press 1 to detect the thickness of dirt on the filter cloth surface. The pressure sensor is installed at the position where the plate and frame filter press 1 outputs mechanical pressure to monitor changes in the filtration resistance of the plate and frame filter press 1.

[0020] The control system is electrically connected to the spray device 2 and the sensor assembly 3, and has a built-in PLC controller and PID algorithm module for receiving sensor signals and controlling the working state of the spray device 2, such as the spray pressure, spray time and pulse frequency of the spray device 2.

[0021] The sensor assembly 3 detects dirt on the surface of the filter cloth and the filtration resistance of the plate and frame filter press 1, and the control system adjusts the working state of the spray device 2 according to the sensor signal. The spray device 2 then flushes the filter cloth of the plate and frame filter press 1, and the sewage generated by the flushing enters the sewage collection tank 4 for treatment, thereby improving the working efficiency of the plate and frame filter press 1, reducing the efficiency drop caused by filter cloth blockage and the need for manual cleaning, and reducing labor costs.

[0022] As described above, the spray device 2 includes a spray pipe 201 installed above the plate and frame filter press 1, and a plurality of spray holes 202 are opened on the spray pipe 201; the spray holes 202 are facing the side where the filter cloth is located, and the spray pipe 201 can be connected to an external water source. After the valve is opened, clean water is sprayed out from the spray holes 202 of the spray pipe 201 along the pipeline to clean the filter cloth.

[0023] The plurality of spray holes 202 are distributed in a matrix pattern, and the distance between two adjacent spray holes 202 is 20-30 cm, so as to ensure more comprehensive spray coverage of the filter cloth.

[0024] Furthermore, the sewage collection tank 4 and the circulating water treatment unit are connected through a sewage pump, and the output end of the circulating water treatment unit is connected to the input end of the spray device 2; the sewage collection tank 4 includes a tank body 401, and the tank body 401 is provided with an inclined guide surface and a filtering structure 402. The filtering structure 402 adopts a filter screen and is located in the tank, and the bottom of the tank body 401 is connected to the sewage pump.

[0025] The sewage generated by cleaning the filter cloth falls into the trough body 401 of the sewage collection tank 4 along the inclined guide surface under the action of gravity. After the large particles of impurities are initially filtered out by the filtering structure 402, the initially filtered sewage enters the circulating water treatment unit under the pumping of the sewage pump. After the treatment is completed, it is pumped by the corresponding water pump to the spray pipe 201 of the spray device 2 to clean the filter cloth again.

[0026] The circulating water treatment unit utilizes existing technologies, including filtration, flocculation, and activated carbon adsorption, to purify and reuse wastewater through multiple treatment processes. After treatment, the circulating water can be reused in the spraying device 2 for further flushing, improving wastewater treatment effectiveness, contributing to environmental protection, and reducing water treatment costs.

[0027] Working principle: First, install the spray device 2, sensor assembly 3, control system, and sewage collection tank 4 according to the design requirements, and set the system operating parameters, such as the spray time interval or adjust the spray intensity according to sensor feedback; After the plate and frame filter press 1 has been working for a period of time, the sensor will detect the dirt on the filter cloth and send a signal to the control system. The control system will start the spray device 2 to clean the filter cloth according to the preset conditions. The cleaned sewage will flow into the sewage collection tank 4 for subsequent treatment. The qualified sewage will be pumped to the spray device 2 again by the water pump to realize wastewater reuse; in this way, the automatic cleaning process of the plate and frame filter press 1 is realized, the working efficiency is improved and the quality of water treatment is guaranteed. Example 2

[0028] like Figure 1-Figure 4 As shown, based on Example 1, the present invention also proposes a plate and frame filter press cleaning method, which adopts the plate and frame filter press cleaning system proposed in Example 1, including the steps of real-time detection of filter cloth status, triggering cleaning condition judgment, dynamic adjustment of spray parameters, sewage collection and treatment, and anti-blocking and equipment protection.

[0029] Real-time detection of filter cloth status: The thickness of dirt on the filter cloth surface is detected by an infrared sensor, while the resistance change during the filtration process is monitored by a pressure sensor. The data of the two are integrated to generate a dirt index. The detection accuracy of the infrared sensor is ±0.1mm, and the detection frequency of the pressure sensor is 1 time / minute. The data of the two are integrated through a weighted algorithm to calculate the dirt index. The formula is: S=a·T+b·ΔP Where S is the dirt index, T is the dirt thickness detected by the infrared sensor (unit: mm), ΔP is the pressure change rate (the percentage increase of the current pressure compared to the clean state), a and b are weight coefficients, and a + b = 1.

[0030] Under standard working conditions, such as the plate and frame filter press 1 used to treat sludge in steel plants, a=0.6, b=0.4, that is, thickness is the main factor and pressure is used as an auxiliary verification.

[0031] Under high viscosity conditions, such as a plate and frame filter press 1 used for treating chemical slurries, a=0.4, b=0.6. In this case, the pressure change is more sensitive.

[0032] The calculation formula for the pressure change rate is: ΔP = (P1-P0) / P0×100%, where P1 is the current pressure and P0 is the reference pressure recorded in the clean state.

[0033] Through the adjustable weight coefficient mechanism, it is compatible with different material characteristics and dynamically adapts to complex working conditions. For example, a=0.6 under standard working conditions and a=0.4 under high viscosity working conditions. The thickness of steel plant sludge (granular dirt) is dominant, and the pressure change is dominant in chemical slurry (sticky dirt). The model can adaptively adjust the detection focus dimension.

[0034] Trigger cleaning condition judgment: The control system presets the dirt thickness threshold and pressure change threshold. When the dirt index exceeds the preset threshold, the cleaning program is triggered.

[0035] For example, if the threshold of the dirt index is set to 1, when the PID algorithm module of the control system calculates that the current dirt index is greater than 1 based on the data transmitted by the sensor component 3, its built-in PLC controller will control the spray device 2 to work, that is, the water pump starts and the valve opens, so that clean water is sprayed onto the filter cloth to rinse it.

[0036] Furthermore, the system can also dynamically adjust the spray parameters of the spray device 2 after it is started. Similarly, according to the dirt index calculated by the above method, the control system adjusts the spray pressure, spray time and pulse frequency of the spray device 2 to flush the filter cloth of the plate and frame filter press 1.

[0037] For example, the spray pressure range of the spray device 2 is 5-10MPa, and a pulse valve is installed on the spray pipe 201. When the dirt index is ≤1mm, the pulse valve opens and continuous flushing is adopted with 5-8MPa; when the dirt index is greater than 1mm, the pulse valve starts and pulse flushing is adopted with 8-10MPa, and the pulse interval is 1-3 seconds.

[0038] Compared with traditional timed cleaning or single parameter triggering, this method integrates infrared thickness detection and pressure change rate as dual parameters, avoiding the defects of a single sensor, significantly improving the system's anti-interference ability, and triggering cleaning based on the dirt index threshold, making cleaning more timely and effective, and extending the service life of the filter cloth and the overall equipment.

[0039] During the spray flushing process, the system can also collect and treat sewage. The sewage generated by flushing the filter cloth is filtered out of large particles of impurities through the inclined sewage collection tank 4 and then enters the circulating water treatment unit. The collected wastewater is returned to the spray device 2 after treatment, realizing wastewater reuse and greatly reducing water costs.

[0040] In order to facilitate sewage collection, the slope of the inclined guide surface of the sewage collection tank 4 is ≥5°.

[0041] After cleaning is complete, the pulse valve in spray device 2 initiates a reverse flushing process to remove any remaining impurities from spray pipe 201. Because circulating water is used, residual impurities inevitably accumulate in the pipes. Therefore, reverse flushing removes these impurities and prevents them from clogging. If a sudden drop in filter cloth pressure is detected, indicating damage to the filter cloth, the system automatically shuts down and issues an alarm.

[0042] In summary, the present invention proposes a plate and frame filter press cleaning system and method. The spray device 2 of the cleaning system can automatically flush the filter cloth at a set time interval or according to the degree of dirt feedback from the sensor. The sensor component 3 is responsible for real-time monitoring of the dirt condition on the surface of the filter cloth and transmitting the information to the control system; the control system controls the working state of the spray device 2 based on the received information; the sewage collection tank 4 collects the flushed sewage and transports it to the circulating water treatment unit through the sewage pump, and the wastewater is purified and then pumped to the spray device 2; compared with traditional timed cleaning or single parameter triggering, this cleaning method integrates infrared thickness detection and pressure change rate dual parameters, avoids the defects of a single sensor, significantly improves the anti-interference ability of the system, and triggers cleaning based on the dirt index threshold, making cleaning more timely and effective, thereby extending the service life of the filter cloth and the overall equipment.

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" 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 invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0044] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0045] The above description is based on the ideal embodiment of the present invention. Based on the above description, relevant personnel can make various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the content of the specification and must be determined according to the scope of the claims.

Claims

1. A plate and frame filter press cleaning system, characterized by: The system comprises a spray device, a sensor assembly, a control system and a sewage collection tank, wherein the sewage collection tank is arranged below the plate and frame filter press, and the spray device comprises a spray pipe installed above the plate and frame filter press, wherein the spray pipe is provided with a plurality of spray holes; The sensor assembly includes an infrared sensor for detecting the thickness of dirt on the filter cloth surface and a pressure sensor for monitoring changes in filtration resistance; the control system is electrically connected to the spray device and the sensor assembly, and the control system is used to receive sensor signals and control the working state of the spray device.

2. The plate and frame filter press cleaning system according to claim 1, characterized in that: The sewage collecting tank comprises a tank body, an inclined guide surface and a filtering structure are provided on the tank body, and the bottom of the tank body is connected to a sewage pump.

3. The plate and frame filter press cleaning system according to claim 2, characterized in that: The output end of the sewage pump is connected to a circulating water treatment unit for recycling clean wastewater, and the output end of the circulating water treatment unit is connected to the input end of the spraying device.

4. The plate and frame filter press cleaning system according to claim 1, characterized in that: The plurality of spray holes are distributed in a matrix, and the distance between two adjacent spray holes is 20-30 cm.

5. A plate and frame filter press cleaning method, using the plate and frame filter press cleaning system according to any one of claims 1 to 4, characterized in that: The steps include: S1. Real-time detection of filter cloth status: using infrared sensors to detect the thickness of dirt on the filter cloth surface, and using pressure sensors to monitor changes in resistance during filtration, and integrating the two data to generate a dirt index. S2. Trigger cleaning condition judgment. The control system presets a dirt thickness threshold and a pressure change threshold. When the dirt index exceeds the preset threshold, the cleaning program is triggered; S3, dynamically adjusting the spray parameters, according to the dirt index in step S1, adjusting the spray pressure, spray time and pulse frequency of the spray device through the control system to flush the filter cloth of the plate and frame filter press; S4, sewage collection and treatment, the sewage generated by flushing is filtered through the inclined sewage collection tank for large particle impurities, and then enters the circulating water treatment unit to achieve wastewater reuse; S5. After cleaning, the spray device starts the reverse flushing process to remove the residual impurities in the spray pipe.

6. The plate and frame filter press cleaning method according to claim 5, characterized in that: In step S1, the detection accuracy of the infrared sensor is ±0.1 mm, and the detection frequency of the pressure sensor is 1 time / minute. The data of the two are fused by a weighted algorithm to calculate the dirt index. The formula is: S=a·T+b·ΔP Where S is the dirt index, T is the dirt thickness detected by the infrared sensor, ΔP is the pressure change rate, a and b are weight coefficients, and a + b = 1.

7. The plate and frame filter press cleaning method according to claim 5, characterized in that: In step S3, the spray pressure range of the spray device is 5-10 MPa. When the dirt index is ≤1 mm, continuous flushing is performed at 5-8 MPa; when the dirt index is greater than 1 mm, pulse flushing is performed at 8-10 MPa, with a pulse interval of 1-3 seconds.

8. The plate and frame filter press cleaning method according to claim 5, characterized in that: In step S4, the slope of the inclined guide surface of the sewage collection tank is ≥5°, and the collected wastewater is recycled to the spraying device after treatment.

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