A low-energy sludge deep filter press device and its control method

Abstract

This invention relates to a low-energy sludge deep filter press device and its control method. By controlling the extension and retraction length of the piston rod of the hydraulic cylinder and the sludge discharge control module, the thickness of each layer of sludge to be dewatered in the inner cylinder is controlled. The thickness of each layer of sludge to be dewatered in the sludge filter press frame decreases sequentially from top to bottom in the inner cylinder. By adjusting the thickness of the sludge to be dewatered at different positions, the problem of different moisture content distributions in the upper and lower layers of sludge after dewatering is avoided, so that the moisture content of the upper and lower layers of sludge in the sludge filter press frame remains relatively consistent after dewatering.

Description

Technical Field

[0001] This invention belongs to the field of sludge treatment technology and relates to a low-energy sludge deep filter press device and its control method. Background Technology

[0002] Deep sludge dewatering technology can reduce the total amount of sludge while turning waste into valuable resources, thus broadening its application. With the continuous advancement of sludge treatment and disposal technologies, the manufacturing processes and quality of deep sludge dewatering equipment are also constantly improving, contributing to the development of green, environmentally friendly, and energy-saving services. To achieve sludge reduction, stabilization, harmlessness, and resource utilization, and to provide possibilities and profit margins for processes such as sludge drying, carbonization, and incineration, high-efficiency, low-cost sludge dewatering is a key aspect of sludge treatment and disposal technology.

[0003] Sludge dewatering methods mainly include mechanical dewatering and high-temperature dewatering. Due to the high energy consumption and cost of high-temperature dewatering, current sludge treatment in the industry primarily relies on mechanical dewatering combined with drying. Current sludge dewatering machines mainly include belt dewatering machines, centrifugal dewatering machines, plate and frame dewatering machines, screw press dewatering machines, roller press dewatering machines, and vacuum dewatering machines, with belt dewatering machines, centrifugal dewatering machines, and plate and frame dewatering machines being the most commonly used. However, these dewatering devices generally suffer from cumbersome structures and limited drying effects, and the treated sludge is not suitable for processes such as resource-based incineration.

[0004] Patent CN112723703A discloses a sludge filter press, including a pressure mechanism, a filter media frame, a first filter cloth, and a second filter cloth. The pressure mechanism includes a first telescopic push rod and a pressure plate located at the bottom of the first telescopic push rod. The top of the filter media frame is open, and the side walls of the filter media frame are provided with multiple drainage holes. Conditioned sludge (moisture content 80%–92%) is pumped into the space between the first and second filter cloths using a screw pump or a plunger pump. Then, the first and second filter cloths, which are wrapped with sludge, are stacked in an S-shape inside the filter media frame. Finally, the pressure plate is pushed by the first telescopic push rod. The pressure plate moves downwards, pressing it onto the stacked first and second filter cloths. The first telescopic push rod pushes the pressure plate downwards, squeezing the liquid in the sludge out between the first and second filter cloths. The squeezed liquid flows down through the drainage holes on the side wall of the filter press frame, thus completing the separation of mud and water in the sludge. After the water in the sludge is squeezed out, the remaining mud cake can be removed from between the first and second filter cloths. Then, the first and second filter cloths can continue to wrap new sludge for squeezing. The operation is simple, the work is stable, and the equipment requires low-cost tools.

[0005] Regarding the aforementioned existing technology, since the sludge to be dewatered is already placed between the first and second filter cloths before being laid into the filter press frame, the thickness of each layer of sludge cake cannot be precisely controlled. Generally speaking, the thickness of the sludge to be dewatered between the first and second filter cloths is basically the same. However, because the sludge cake is distributed in multiple layers above and below the filter press frame, there is a problem of different moisture content distributions between the upper and lower layers of sludge during synchronous filtration, with the upper layer having a lower moisture content and the lower layer having a higher moisture content. At the same time, the liquid squeezed out of the sludge cake in this device flows down through the drainage holes on the side wall of the filter press frame. Therefore, the liquid is more likely to flow out from the edges of the sludge cake near the side wall of the filter press frame, while the water in the sludge cake near the center of the filter press frame is more difficult to drain. Therefore, the moisture content of the sludge cake in the same layer is also different at different locations, with the moisture content being higher in the middle and lower at the edges. Because the moisture content of the sludge cake in the filter press frame is inconsistent at different heights and positions, it also brings certain difficulties to the subsequent uniform processing of the sludge cake.

[0006] Therefore, how to reduce the moisture content of sludge dewatering and avoid inconsistent moisture content at different locations in the dewatered sludge cake is a technical problem that urgently needs to be solved. Summary of the Invention

[0007] (a) Purpose of the invention

[0008] To address the shortcomings and deficiencies of existing sludge dewatering devices, this invention proposes a low-energy-consumption sludge deep filter press device and its control method. By controlling the extension and retraction length of the piston rod of the hydraulic cylinder and the sludge output, the thickness of each layer of sludge to be dewatered in the inner cylinder is controlled. The thickness of each layer of sludge to be dewatered in the sludge filter press frame decreases sequentially from top to bottom in the inner cylinder. By adjusting the thickness of the sludge to be dewatered at different positions, the problem of different moisture content distributions in the upper and lower layers of sludge after dewatering is avoided, ensuring that the moisture content of the upper and lower layers of sludge in the sludge filter press frame remains relatively consistent after dewatering.

[0009] (II) Technical Solution

[0010] To achieve the objective of this invention, the present invention adopts the following technical solution:

[0011] The first objective of this invention is to provide a low-energy-consumption sludge deep filter press device, comprising a filter cloth conveying device, a sludge discharge control module, a scraping and pressing module, a sludge filter press frame, and a control device. The sludge filter press frame is disposed in the middle of the base. The filter cloth conveying device is used to control the winding of the first and second filter cloths. Specifically:

[0012] The mud discharge control module includes a nozzle and a retractable mud conveying pipeline. The nozzle is located at one end of the mud conveying pipeline. An electromagnetic control valve, a flow sensor, and a moisture content detection device for detecting the moisture content of the mud are installed in the part of the mud conveying pipeline near the nozzle.

[0013] The sludge filter press frame includes an outer shell and an inner cylinder. The inner cylinder is nested inside the outer shell. A hydraulic cylinder is installed on the bottom surface of the inner shell. A bottom plate is provided at the bottom of the inner cylinder. Filter holes are provided on both the inner cylinder and the bottom plate. The piston rod extending from the hydraulic cylinder is fixedly connected to the bottom surface of the bottom plate to control the bottom plate to move up and down inside the inner cylinder. The first filter cloth, the second filter cloth, and the sludge between them are stacked on the bottom plate of the inner cylinder in an S-shape.

[0014] A pressurizing device is installed above the sludge filter press frame, and a scraping module is installed on the upper surface of the sludge filter press frame.

[0015] The control device is communicatively connected to the electromagnetic control valve, flow sensor, moisture content detection device, and hydraulic cylinder. It controls the thickness of each layer of cement slurry to be dewatered in the inner cylinder by controlling the extension and retraction length of the piston rod of the hydraulic cylinder and the amount of slurry discharged by the slurry discharge control module. h paving thickness h The tube is lowered sequentially from top to bottom inside the inner cylinder.

[0016] The second objective of this invention is to provide a control method for a low-energy-consumption sludge deep filter press device, the method comprising the following steps:

[0017] S1: Adjust the deep filter press to the initial state and control the piston rod of the hydraulic cylinder to extend so that the height of the upper surface of the bottom plate is flush with the height of the upper end of the sludge filter press frame.

[0018] S2: The control device determines the laying thickness of each layer of cement slurry based on the moisture content of the cement slurry to be desorbed detected by the moisture content detection device and the pressure of the pressurizing device. h ;

[0019] S3: Controls the piston rod of the hydraulic cylinder to retract downwards, the retraction length being... y = h +2 c ,in c The thickness of the first and second filter cloths;

[0020] S4: Lay the first filter cloth in the inner cylinder. The control device controls the sludge discharge control module to spray the cement slurry to be removed onto the first filter cloth laid in the inner cylinder. When the sprayed sludge reaches the required amount of cement slurry to be removed in that layer... Q When the sludge spraying stops, a second filter cloth is laid on the cement slurry to be dewatered. The first filter cloth, the second filter cloth and the cement slurry to be dewatered between them are leveled on the upper surface of the second filter cloth by a scraping and pressing module.

[0021] S5: Repeat step S3, fold the second filter cloth inside the sludge filter press frame, and spray the cement slurry to be desorbed onto the second filter cloth. When the sprayed sludge reaches the amount of cement slurry to be desorbed in that layer... Q When the sludge spraying stops, the first filter cloth is laid on the cement slurry to be dewatered. Then, the first filter cloth, the second filter cloth and the cement slurry to be dewatered between them are leveled on the upper surface of the first filter cloth by the scraping and pressing module.

[0022] S6: Repeat steps S3-S5 until the bottom plate moves to the bottom of the inner cylinder, and the installation is complete;

[0023] S7: Start the pressurization device to pressurize the sludge slurry to be dewatered in the sludge filter press frame, so that the sludge to be dewatered is fully dewatered.

[0024] (III) Technical Effects

[0025] Compared with the prior art, the low-energy sludge deep filter press device and its control method of the present invention have the following beneficial and significant technical effects:

[0026] (1) In this invention, the first filter cloth, the second filter cloth, and the sludge between the first filter cloth and the second filter cloth are stacked in an S-shape in the sludge filter press frame. The control device controls the thickness of each layer of sludge to be dewatered in the inner cylinder by controlling the extension and retraction length of the piston rod of the hydraulic cylinder and the amount of sludge discharged by the sludge discharge control module. The thickness of each layer of sludge to be dewatered in the sludge filter press frame decreases from top to bottom in the inner cylinder. By adjusting the thickness of the sludge to be dewatered at different positions, the problem of different moisture content distribution of the upper and lower layers of sludge after dewatering is avoided, so that the moisture content of the upper and lower layers of sludge in the sludge filter press frame remains relatively consistent after dewatering.

[0027] (2) The control device of this invention determines the laying thickness of each layer of sludge based on the moisture content of the sludge to be dewatered and the pressure of the pressurizing device. By comprehensively considering various factors affecting sludge dewatering, the filling amount of each layer of sludge to be dewatered is more accurately controlled using the calculation formula of the laying thickness of each layer of sludge to be dewatered, ensuring the consistency of sludge dewatering under different conditions. By controlling the optimal laying thickness of each layer of sludge cloth, some intracellular water in the sludge is released efficiently, while the filter press speed is increased and energy consumption is reduced.

[0028] (3) To avoid uneven moisture content in different locations of the same layer of sludge cake, i.e., a distribution where the moisture content of the dewatered sludge in the same layer is higher in the middle and lower at the edges, this invention arranges water-guiding ribs on the opposite surfaces of the first and second filter cloths. Since the water-guiding ribs are arranged transversely through the filter cloths, they can ensure that the moisture in the sludge cake near the center of the filter press frame is smoothly discharged. By setting water-guiding ribs on the first and second filter cloths, the moisture in the sludge cake near the center of the filter press frame is easily discharged, making the moisture content of the sludge cake in different locations of the same layer tend to be consistent. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the low-energy sludge deep filter press device of the present invention;

[0030] Figure 2 This is a schematic diagram of the sludge filter press frame;

[0031] Figure 3 This is a partial schematic diagram of a filter cloth with water-guiding ribs;

[0032] Figure 4 This is a flowchart of the control method for a low-energy sludge deep filter press device. Detailed Implementation

[0033] To better understand the present invention, the following embodiments further illustrate its content. Throughout the accompanying drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. The described embodiments are some, but not all, of the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. The structure and technical solutions of the present invention will be further described in detail below with reference to the accompanying drawings, and the following embodiments of the present invention are given.

[0034] Example 1

[0035] like Figures 1-3As shown, a low-energy sludge deep filter press device includes a filter cloth conveying device, a pressurizing device 20, a sludge discharge control module 30, a scraping module 40, a sludge filter press frame 50, and a control device 60. The sludge filter press frame 50 is set in the middle of the base 100. The filter cloth conveying device is used to convey the filter cloth and includes a first winding roller 11 and a second winding roller 12. The first winding roller 11 is used to control the winding of the first filter cloth, and the second winding roller 12 is used to control the winding of the second filter cloth. The first winding roller 11 and the second winding roller 12 are respectively equipped with... The components are placed on both sides of the sludge filter press frame 50; a pressurizing device 20 is installed above the sludge filter press frame 50, which is used to pressurize and dewater the installed sludge filter press frame 50. The sludge discharge control module includes a nozzle 31 and a retractable sludge conveying pipeline 32. The nozzle 31 is located at one end of the sludge conveying pipeline 32 to provide sludge to be dewatered between the first filter cloth 111 and the second filter cloth 121. An electromagnetic control valve 33 and a flow meter for detecting the sludge supply are installed in the sludge conveying pipeline 32 near the nozzle 31. A moisture content sensor 34 is installed in the mud conveying pipeline 32, away from the nozzle 31, and a moisture content detection device 35 is installed to detect the moisture content of the mud. The sludge filter press frame 50 includes an outer shell 501 and an inner cylinder 502. The inner cylinder 502 is nested inside the outer shell 501. A hydraulic cylinder 503 is installed on the bottom surface of the inner shell 501. A bottom plate 505 is installed at the bottom of the inner cylinder 502. Filter holes are provided on both the inner cylinder 502 and the bottom plate 505. The piston rod 504 extending from the hydraulic cylinder 503 is fixed to the bottom surface of the bottom plate 505. The connection is used to control the bottom plate 505 to move up and down inside the inner cylinder 502. The first filter cloth, the second filter cloth, and the sludge between the first filter cloth and the second filter cloth are stacked on the bottom plate 505 of the inner cylinder 502 in an S-shape. The scraping and pressing module 40 is set on the upper end face of the sludge filter press frame 50. The scraping and pressing module 40 is used to flatten the sludge and filter cloth. The inner cylinder 502 makes the thickness of the sludge in each layer evenly distributed. The control device 60 is communicatively connected to the electromagnetic control valve 33, the flow sensor 34, the moisture content detection device 35, and the hydraulic cylinder.

[0036] The control device 60 controls the extension and retraction length of the piston rod of the hydraulic cylinder and the discharge amount of the sludge discharge control module 30 to control the thickness of each layer of cement slurry to be dewatered in the inner cylinder. Preferably, the thickness of each layer of cement slurry to be dewatered is controlled between 15-25mm. The thickness of each layer of cement slurry to be dewatered in the inner cylinder decreases from top to bottom in sequence, which avoids the problem of different moisture content distribution of the upper and lower layers of sludge after dewatering, so that the moisture content of the upper and lower layers of sludge in the sludge filter press frame remains relatively consistent after dewatering.

[0037] To better ensure the consistency of moisture content in each layer of the dewatered mud cake, the amount of mud to be dewatered provided between the first filter cloth 111 and the second filter cloth 121 is... Q , Q The calculation formula is: ,in h The thickness of the cement slurry to be removed in each layer. A This represents the area of ​​the cross section 222 of the inner cylinder.

[0038] To ensure consistent sludge dewatering under different conditions, the thickness of each layer of sludge to be dewatered should be adjusted. h The formula for calculation is: In the formula P The pressure provided to the pressurizing device, P ref For reference pressure ，W The moisture content of the sludge in the sludge conveying pipeline, as measured by a moisture content detection device. W ref For reference moisture content (usually selected as 85%) L The length of the piston rod extension is the length when the height of the upper surface of the base plate is flush with the height of the upper end face of the sludge filter press frame. l This refers to the initial extension length of the piston rod when laying the corresponding layer of cement slurry to be removed. According to the above formula, the greater the pressure applied by the pressurizing device, the... h The larger the water content, the better; when the water content of the cement slurry to be dewatered is, h The smaller the value; the longer the piston rod extends, the closer the sludge to be dewatered is distributed to the bottom of the sludge filter press frame. h The smaller the thickness. By comprehensively considering various factors affecting mud dewatering, the thickness of the mud slurry to be dewatered in each layer is utilized. h The calculation formula allows for more precise control of the filling amount of sludge slurry in each layer, ensuring consistency in sludge dewatering under different conditions. To fully guarantee the effect of filter press, when the calculation results... h When it is greater than 25mm, h The value is set to 25mm, ensuring that each layer of sludge is within 25mm. By controlling the optimal laying thickness of each layer of sludge cloth, some intracellular water in the sludge is released efficiently, improving the filter press speed and reducing energy consumption. This method can reduce the volume of sludge with a moisture content of approximately 85% with little or no added chemicals.

[0039] As a better implementation, a sludge wall-breaking pump is installed at the front end of the sludge conveying pipeline 32. The sludge wall-breaking pump delivers sludge to the sludge discharge control module. The sludge wall-breaking pump installed at the front end can better release the intracellular water in the sludge.

[0040] To prevent the scraping module from affecting the transmission of the filter cloth during the laying of filter cloth and sludge in the sludge filter press frame, a scraper is installed on the scraping module. The scraper in the scraping module is made to be rotatable. That is, when it is necessary to scrape the filter cloth, the scraper rotates to the lower side and scrapes the filter cloth by moving laterally; when it is not necessary to scrape, the scraper rotates to the upper side to avoid affecting the transmission of the filter cloth.

[0041] A guide rail is provided on the base, and the sludge filter press frame 50 is set in a movable manner. A guide wheel is provided at the bottom of the sludge filter press frame 50. The guide wheel cooperates with the guide rail to facilitate the movement of the sludge filter press frame.

[0042] The direction of mud spraying from nozzle 31 can be controlled. During the mud discharge process, the direction of mud spraying from nozzle 31 can be set to rotate at a constant speed or move in a specific pattern, so that the mud is distributed more evenly between the first filter cloth and the second filter cloth, reducing the working time of the scraping module.

[0043] To avoid uneven moisture content in different parts of the same layer of sludge cake, i.e., a distribution where the moisture content of the dewatered sludge in the same layer is high in the middle and low at the edges, water-guiding ribs 101 are arranged on the opposite surfaces of the first filter cloth 111 and the second filter cloth 121. That is, the water-guiding ribs 101 are set on the surfaces of the first filter cloth 111 and the second filter cloth 121 that are in contact with the sludge. The water-guiding ribs 101 are arranged along the width direction of the first filter cloth 111 and the second filter cloth 121, and several water-guiding ribs 101 are evenly distributed along the length direction of the first filter cloth 111 and the second filter cloth 121. The water-guiding ribs 101 are hollow tubular structures. Multiple drainage holes 1011 are provided on the surface of the water-guiding ribs along the length direction of the water-guiding ribs. The multiple drainage holes 1011 are distributed along the length direction of the water-guiding ribs in a way that is dense in the middle and sparse at the ends, so that the water in the middle part of the sludge that is difficult to drain has a sufficient flow path to be discharged outside the inner cylinder. During the sludge pressurization process, the water-guiding ribs, which are horizontally installed through the filter cloth, ensure the smooth discharge of water from the sludge cake near the center of the filter press frame. By installing water-guiding ribs on the first and second filter cloths, it is easier to discharge water from the sludge cake near the center of the filter press frame, making the moisture content of the sludge cake in the same layer more consistent across different locations, thus avoiding a distribution where the moisture content of the sludge cake in the same layer is higher in the middle and lower at the edges.

[0044] To ensure the drainage of water from the sludge cake near the center of the filter press frame, the distribution density of the water guide ribs 101 along the length of the first filter cloth 111 and the second filter cloth 121 is such that 2-3 water guide ribs are provided on each layer of the first filter cloth 111 and the second filter cloth 121 folded in the sludge filter press frame 50.

[0045] In order to further enable the water guide ribs to fully drain the water from each cross section of the mud cake, the water guide ribs on the first filter cloth 111 and the second filter cloth 121 are arranged in an alternating pattern.

[0046] Example 2

[0047] Figure 4 The flow chart of the control method for this low-energy sludge deep filter press device is shown. The control method specifically includes the following steps:

[0048] S1: Adjust the low-energy sludge deep filter press device to the initial state, close the electromagnetic control valve, and control the piston rod of the hydraulic cylinder to extend so that the height of the upper surface of the bottom plate 505 is flush with the height of the upper end of the sludge filter press frame.

[0049] S2: The control device 60 determines the laying thickness of each layer of cement slurry based on the moisture content of the cement slurry to be removed in the mud control module detected by the moisture content detection device 35 and the pressure of the pressurizing device 20. h Extend the slurry delivery pipeline 32 so that the nozzle 31 is positioned above the center of the sludge filter press frame 50;

[0050] S3: The length by which the piston rod of the control hydraulic cylinder retracts is... y , y = h +2 c ,in c The thickness of the first and second filter cloths;

[0051] S4: Control the first take-up roller 11 to rotate and lay the first filter cloth in the inner cylinder. Control device 60 opens electromagnetic control valve 33 and sprays the cement slurry to be removed onto the first filter cloth laid in the inner cylinder. Flow sensor 34 detects the amount of slurry sprayed by mud control module 30 reaching the layer of cement slurry to be removed. Q At that time, the control device 60 closes the electromagnetic control valve 33, and then controls the second take-up roller 12 to rotate to lay the second filter cloth on the cement slurry to be desorbed. Then, the scraping and pressing module 40 flattens the first filter cloth, the second filter cloth and the cement slurry to be desorbed between them on the upper surface of the second filter cloth.

[0052] S5: Repeat step S3, control the second winding roller 12 to rotate and fold the second filter cloth inside the sludge filter press frame, control device 60 opens solenoid control valve 33, sprays the cement slurry to be desorbed onto the second filter cloth, flow sensor 34 detects the amount of cement slurry sprayed by sludge control module 30 reaching the layer to be desorbed. Q At that time, the control device 60 closes the electromagnetic control valve 33, and then controls the first take-up roller 11 to rotate and lay the first filter cloth on the cement slurry to be desorbed. Then, the scraping and pressing module 40 flattens the first filter cloth, the second filter cloth and the cement slurry to be desorbed between them on the upper surface of the first filter cloth.

[0053] S6: Repeat steps S3-S5 until the bottom plate 505 moves to the bottom of the inner cylinder, and the fabric laying is completed;

[0054] S7: Contract the sludge conveying pipeline 32 so that the vertical projection of the nozzle 31 is removed from above the sludge filter press frame 50. Start the pressurizing device 20 to pressurize the sludge containing cement to be dewatered in the sludge filter press frame 50 and maintain it for a specified time so that the sludge to be dewatered is fully dewatered.

[0055] To better illustrate the effects of the embodiments of the present invention, Table 1 shows the results of the control experiment. Both the control group and the experimental group conducted compression experiments on municipal sludge with a moisture content of 83.59%. In the control group, filter cloth without added water-guiding ribs was used, and the thickness of each layer of sludge in the sludge filter press frame was the same. In the experimental case, the pressing method of the present invention was used, i.e., filter cloth with water-guiding ribs was used, and the thickness of each layer of sludge to be dewatered in the sludge filter press frame decreased from top to bottom in the inner cylinder. After pressing, the sludge cakes located in the center of the upper, middle, and lower layers of the sludge filter press frame were tested. According to the results shown in Table 1, in the control group, the moisture content of the upper layer was the lowest, followed by the middle layer, and the highest after pressing, with the difference in moisture content between the upper and lower layers being greater than 5%. In the experimental case adopted according to the technical solution of the present invention, the moisture content of each layer after pressing was basically the same, with the difference controlled within 1%. Compared with the control case, it can be seen that the moisture content of the center of each layer, especially the middle and lower layers, decreased significantly. In summary, the implementation method of the present invention can ensure that the moisture content of the sludge in the upper and lower layers of the sludge in the sludge filter press remains relatively consistent after self-dewatering, thereby enabling the efficient release of intracellular water in the sludge, increasing the filtration speed, and improving the filtration effect.

[0056] Table 1 Results of the control experiment

[0057]

[0058] The objectives of this invention have been fully and effectively achieved through the above embodiments. Those skilled in the art will understand that this invention includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments described above. Although the invention has been described with reference to what is currently considered the most practical and preferred embodiments, it should be understood that the invention is not limited to the disclosed embodiments, and any modifications that do not depart from the functional and structural principles of the invention will be included within the scope of the claims.

Claims

1. A low-energy consumption sludge deep filter press device, comprising a filter cloth conveying device, a sludge discharge control module, a scraping and pressing module, a sludge filter press frame, and a control device, wherein the sludge filter press frame is arranged in the middle of the base, and the filter cloth conveying device is used to control the winding of a first filter cloth and a second filter cloth, characterized in that the sludge discharge control module comprises a nozzle and an extendable slurry conveying pipeline, the nozzle is arranged at one end of the slurry conveying pipeline, and an electromagnetic control valve, a flow sensor, and a water content detection device for detecting the water content of the slurry are arranged on the part of the slurry conveying pipeline close to the nozzle; the sludge filter press frame comprises an outer shell and an inner cylinder, the inner cylinder is arranged in the inner part of the outer shell, a hydraulic cylinder is arranged on the inner bottom surface of the outer shell, a bottom plate is arranged at the lower part of the inner cylinder, filter holes are arranged on the inner cylinder and the bottom plate, a piston rod extending out of the hydraulic cylinder is fixedly connected to the bottom surface of the bottom plate and used to control the up-and-down movement of the bottom plate in the inner cylinder, the first filter cloth, the second filter cloth, and the slurry between the first filter cloth and the second filter cloth are stacked in an S-shaped manner on the bottom plate of the inner cylinder; the slurry conveying pipeline can be extended so that the nozzle is placed above the center position of the sludge filter press frame, and the slurry to be dewatered is sprayed on the first filter cloth or the second filter cloth arranged in the inner cylinder; during the control of sludge discharge, the sludge spraying direction of the nozzle can be controlled to make the distribution of the slurry to be dewatered between the first filter cloth and the second filter cloth more uniform; a pressurizing device is arranged above the sludge filter press frame, and the scraping and pressing module is arranged on the upper end surface of the sludge filter press frame; water guide ribs are arranged on the opposite surfaces of the first filter cloth and the second filter cloth, the water guide ribs are arranged along the width direction of the first filter cloth and the second filter cloth, the water guide ribs are in a hollow tubular structure, a plurality of drainage holes are arranged on the surface of the water guide rib along the length direction of the water guide rib, the distribution of the plurality of drainage holes along the length direction of the water guide rib is dense in the middle and sparse at the ends, and the water guide ribs on the first filter cloth and the second filter cloth are arranged in a staggered manner. The laying thickness of each layer of the slurry to be dewatered is controlled to be between 15 mm and 25 mm. A slurry wall breaking pump is arranged at the front end of the slurry conveying pipeline. The water guide ribs are uniformly distributed along the length direction of the first filter cloth and the second filter cloth. The control device is in communication connection with the electromagnetic control valve, the flow sensor, the water content detection device and the hydraulic cylinder. The control device determines the laying thickness of each layer of the cement slurry to be dewatered according to the water content of the cement slurry to be dewatered and the pressure of the pressurizing device, and controls the laying thickness of each layer of the cement slurry to be dewatered in the inner cylinder by controlling the extension length of the piston rod of the hydraulic cylinder and the amount of discharged slurry of the slurry discharging control module h , the laying thickness h decreases from top to bottom in the inner cylinder. The distribution density of the water guide ribs along the length direction of the first filter cloth and the second filter cloth is set to ensure that there are 2-3 water guide ribs on each layer of the first filter cloth and the second filter cloth folded in the sludge filter press frame.

2. The low energy consumption sludge deep filter press device according to claim 1, characterized in that, The method comprises the following steps:

3. The low energy consumption sludge deep filter press device according to claim 1, characterized in that, S1: adjusting the deep filter press device to an initial state, controlling the length of the piston rod of the hydraulic cylinder to be extended so that the height of the upper surface of the bottom plate is flush with the height of the upper end surface of the sludge filter press frame; 4. The low energy consumption sludge deep filter press device according to claim 1, characterized in that, y = h + 2c, 5. The low energy consumption sludge deep filter press device according to claim 4, characterized in that, S5: repeating step S3 to fold the second filter cloth in the sludge filter press frame, spraying the slurry to be dewatered on the second filter cloth, stopping the sludge spraying when the sprayed slurry reaches the amount Q of the slurry to be dewatered of the layer, then laying the first filter cloth on the slurry to be dewatered, and then flattening the first filter cloth, the second filter cloth, and the slurry to be dewatered between the first filter cloth and the second filter cloth on the upper surface of the first filter cloth by the scraping and pressing module; 6. A control method for a low-energy sludge deep filter device as claimed in any one of the claims 1-5, characterized in that, S6: repeating steps S3-S5 until the bottom plate moves to the bottom of the inner cylinder, and the laying is completed; S7: starting the pressurizing device to pressurize the slurry to be dewatered in the sludge filter press frame to make the slurry to be dewatered fully dewatered. S2: the control device determines the laying thickness of each layer of the mud to be dewatered according to the water content of the mud to be dewatered in the mud control module detected by the water content detection device and the pressure of the pressurizing device h ; S3: the piston rod of the hydraulic cylinder is controlled to retract downward, the length of retraction being ​ wherein c is the laying thickness of the first filter cloth and the second filter cloth; S4: laying the first filter cloth in the inner cylinder, the control device controls the sludge discharging control module to spray the sludge to be dewatered on the first filter cloth laid in the inner cylinder, when the sprayed sludge reaches the amount of the layer of sludge to be dewatered Q , the sludge spraying is stopped, the second filter cloth is laid on the sludge to be dewatered, and the first filter cloth, the second filter cloth and the sludge to be dewatered therebetween are flattened on the upper surface of the second filter cloth by the scraping and pressing module; ​ ​ ​

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