Low-energy-consumption sludge deep filter pressing device and control method thereof

Abstract

The invention relates to a low-energy-consumption sludge deep filter pressing device and a control method thereof. The laying thickness of each layer of to-be-dehydrated sludge in an inner barrel is controlled by controlling the telescopic length of a piston rod of a hydraulic cylinder and the sludge discharge amount of a sludge discharge control module; the laying thickness of each layer of to-be-dewatered slurry in the sludge filter pressing frame is sequentially reduced from top to bottom in the inner cylinder, and the problem that the water content distribution of the upper and lower layers of dewatered sludge is different is avoided by adjusting the laying thickness of the to-be-dewatered slurry at different positions; and the water content of the sludge in the upper and lower layers in the sludge filter pressing frame is kept relatively consistent after self-dehydration.

Description

Technical Field

[0001] The invention belongs to the technical field of sludge treatment, and relates to a low-energy consumption sludge deep filter pressing device and a control method thereof. Background Art

[0002] With the development of economy and the improvement of people's living standards, the discharge of sewage sludge increases year by year, and the treatment and disposal of sludge has become a focal issue. Sludge deep dehydration technology can reduce the total amount of sludge, and at the same time turn waste into treasure, making the application of sludge more extensive. With the continuous advancement of sludge treatment and disposal technology, the manufacturing process and quality of sludge deep dehydration equipment are also becoming more and more perfect, which is conducive to promoting the development of green environmental protection and energy-saving services. In order to achieve the reduction, stabilization, harmlessness and resource utilization of sludge, and provide possibilities and profit space for sludge drying, carbonization, incineration and other processes, high-efficiency and low-cost sludge dehydration is the key link of sludge treatment and disposal technology.

[0003] The main methods of sludge dehydration include mechanical dehydration and high-temperature dehydration. Due to the high energy consumption and high cost of high-temperature dehydration, the current sludge treatment in the industry is mainly based on mechanical dehydration and drying dehydration. The current sludge dehydrators mainly include: belt dehydrators, centrifugal dehydrators, plate and frame dehydrators, screw dehydrators, roller dehydrators, and vacuum dehydrators, among which belt dehydrators, centrifugal dehydrators, and plate and frame dehydrators are more commonly used. However, the above-mentioned dehydration devices generally have the problems of cumbersome structure and limited drying effect, and the treated sludge is not suitable for processes such as resource incineration.

[0004] Patent CN112723703A discloses a sludge filter press, including a pressure mechanism, a filter press frame, a first filter cloth and a second filter cloth; the pressure mechanism includes a first telescopic push rod and a pressure plate arranged at the bottom end of the first telescopic push rod; the top of the filter press frame is open, and the side wall of the filter press frame is provided with a plurality of water leakage holes, and the conditioned sludge (water content 80% to 92%) is pumped into the space between the first filter cloth and the second filter cloth through a screw pump or a plunger pump, and then the first filter cloth and the second filter cloth wrapped with the sludge are stacked in an S shape in the filter press frame, and then the pressure plate is pushed by the first telescopic push rod. Move downward to press the pressing plate on the stacked first filter cloth and the second filter cloth, and the first telescopic push rod pushes the pressing plate downward to squeeze the liquid in the sludge out from between the first filter cloth and the second filter cloth; the squeezed liquid can flow down through the leakage 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 taken out from between the first filter cloth and the second filter cloth, and then the first filter cloth and the second filter cloth can continue to wrap new sludge for squeezing, the operation is simple, the operation is stable, and the cost of tools required for the equipment is low.

[0005] With respect to the above-mentioned prior art, since the mud to be dehydrated is arranged between the first filter cloth and the second filter cloth before being laid into the filter press frame, there is no way to accurately control the laying thickness of each layer of mud cake. Generally speaking, the laying thickness of the mud to be dehydrated at each location between the first filter cloth and the second filter cloth is basically the same. However, since the mud cake is distributed in multiple layers above and below the filter press frame, there is a problem of different water content distribution of the upper and lower layers of sludge during the simultaneous filter pressing process, and the water content shows a distribution situation of low water content in the upper layer and high water content in the lower layer. At the same time, the liquid squeezed out of the mud cake in the device flows down from the leaking hole on the side wall of the filter press frame, so the liquid in the edge of the mud cake close to the side wall of the filter press frame is easier to flow out, and the water in the mud cake close to the center of the filter press frame is more difficult to discharge. Therefore, the water content of the mud cake at different positions on the same layer is also different, and the water content shows a distribution situation of more water content in the middle and less water content at the edge. Since the water content of the mud cake in the filter press frame is inconsistent at different heights and different positions, the subsequent unified treatment of the mud cake also brings certain troubles.

[0006] Therefore, how to reduce the moisture content of sludge dehydration and avoid inconsistent moisture content at different positions of the dehydrated mud cake is a technical problem that needs to be solved urgently. Summary of the invention

[0007] 1. Purpose of the invention In view of the defects and shortcomings existing in the sludge dewatering devices in the prior art, the present invention proposes a low-energy consumption sludge deep filter press device and a control method thereof, which controls the laying thickness of each layer of sludge to be dewatered in the inner cylinder by controlling the telescopic length of the piston rod of the hydraulic cylinder and the mud discharge amount. The laying 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 laying 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.

[0008] (II) Technical solution To achieve the purpose of the invention, the present invention adopts the following technical solutions: The first invention object of the present invention is to provide a low-energy consumption sludge deep filter press device, comprising a filter cloth conveyor, a mud discharge control module, a scraping and pressing module, a sludge filter press frame, and a control device. The sludge filter press frame is arranged in the middle of the base, and the filter cloth conveyor is used to control the winding of the first filter cloth and the second filter cloth. Specifically: The mud discharge control module includes a nozzle and a retractable mud delivery pipeline. The nozzle is arranged at one end of the mud delivery pipeline. A solenoid control valve, a flow sensor and a water content detection device for detecting the water content of the mud are arranged in the part of the mud delivery pipeline close to the nozzle. The sludge filter press frame comprises an outer shell and an inner cylinder, the inner cylinder is nested inside 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 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 in the inner cylinder, and the first filter cloth, the second filter cloth and the mud between the two are stacked on the bottom plate of the inner cylinder in an S-shaped manner; A pressurizing device is arranged above the sludge filter press frame, and a scraping and pressing module is arranged on the upper end surface of the sludge filter press frame; The control device is connected to the electromagnetic control valve, flow sensor, moisture content detection device, and hydraulic cylinder, and controls the laying thickness of each layer of dewatered slurry in the inner tube by controlling the telescopic length of the piston rod of the hydraulic cylinder and the mud output of the mud output control module. h , laying thickness h Lower from top to bottom in the inner tube.

[0009] The second invention object of the present invention is to provide a control method for a low-energy consumption sludge deep filter press device, the method comprising the following steps: S1: The deep filter press device is adjusted to the initial state, and the length of the piston rod of the hydraulic cylinder is controlled to extend 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; S2: The control device determines the laying thickness of each layer of the slurry to be dewatered according to the moisture content of the slurry to be dewatered in the mud control module detected by the moisture content detection device and the pressure of the pressurizing device. h ; S3: Control the piston rod of the hydraulic cylinder to retract downward, and the retracted length is y = h +2 c ,in c is the laying thickness of the first filter cloth and the second filter cloth; S4: Lay the first filter cloth in the inner drum, and the control device controls the mud discharge control module to spray the dewatered slurry on the first filter cloth laid in the inner drum. When the sprayed slurry reaches the amount of the dewatered slurry in the layer, Q When the sludge is sprayed out, the second filter cloth is laid on the water slurry to be dewatered, and the first filter cloth, the second filter cloth and the water slurry to be dewatered between the two are flattened on the upper surface of the second filter cloth by a scraping module; S5: Repeat step S3, fold the second filter cloth in the sludge filter press frame, spray the slurry to be dewatered on the second filter cloth, and when the sprayed slurry reaches the amount of the slurry to be dewatered in the layer Q When the sludge is sprayed out, the first filter cloth is laid on the water slurry to be dewatered, and then the first filter cloth, the second filter cloth and the water slurry to be dewatered are flattened on the upper surface of the first filter cloth by a scraping module; S6: Repeat steps S3-S5 until the bottom plate moves to the bottom of the inner tube and the paving is completed; S7: Start the pressurizing device to pressurize the slurry with water to be dehydrated in the sludge filter press frame, so that the slurry to be dehydrated is fully dehydrated.

[0010] (III) Technical Effect Compared with the prior art, the low-energy consumption sludge deep filter press device and the control method thereof of the present invention have the following beneficial and significant technical effects: (1) The present invention stacks the first filter cloth, the second filter cloth and the sludge between the first filter cloth and the second filter cloth in an S-shaped manner in a sludge filter press frame. The control device controls the laying thickness of each layer of sludge to be dehydrated in the inner cylinder by controlling the telescopic length of the piston rod of the hydraulic cylinder and the sludge discharge amount of the sludge discharge control module. The laying thickness of each layer of sludge to be dehydrated in the sludge filter press frame decreases from top to bottom in the inner cylinder. By adjusting the laying thickness of the sludge to be dehydrated at different positions, the problem of different moisture content distribution of the upper and lower layers of sludge after dehydration 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 dehydration.

[0011] (2) The control device of the present invention determines the laying thickness of each layer of the slurry to be dehydrated according to the moisture content of the slurry to be dehydrated and the pressure of the pressurizing device. By comprehensively considering various factors affecting the dehydration of the slurry, the calculation formula of the laying thickness of each layer of the slurry to be dehydrated is used to more accurately control the filling amount of each layer of the slurry to be dehydrated, thereby ensuring the consistency of sludge dehydration under different conditions. By controlling the optimal laying thickness of each layer of sludge cloth, part of the intracellular water in the sludge is efficiently released, while the filter pressing speed is increased and the energy consumption is reduced.

[0012] (3) In order to avoid different moisture contents at different positions of the same layer of mud cake, that is, the moisture content of the dehydrated sludge at the same layer is more in the middle and less at the edge, the present invention arranges water guide ribs on the opposite surfaces of the first filter cloth and the second filter cloth. Since the water guide ribs are arranged to penetrate the filter cloth horizontally, it can ensure that the moisture in the mud cake near the center of the filter press frame is smoothly discharged. By arranging the water guide ribs on the first filter cloth and the second filter cloth, the moisture in the mud cake near the center of the filter press frame is easily discharged, so that the moisture content at different positions of the mud cake at the same layer tends to be consistent. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the low energy consumption sludge deep filter press device of the present invention; Figure 2 It is a structural schematic diagram of the sludge filter press frame; Figure 3 It is a partial schematic diagram of the filter cloth with water-conducting ribs; Figure 4 It is a flow chart of a control method for a low energy consumption sludge deep filter press device. DETAILED DESCRIPTION

[0014] In order to better understand the present invention, the content of the present invention is further explained in conjunction with the embodiments below. In the accompanying drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be understood as limitations on the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. The structure and technical solution of the present invention are further described in detail below in conjunction with the accompanying drawings, and the following embodiments of the present invention are given.

[0015] Example 1 like Figure 1-Figure 3As shown, a low-energy consumption sludge deep filter press device comprises a filter cloth conveying device, a pressurizing device 20, a mud discharge control module 30, a scraping and pressing module 40, a sludge filter press frame 50, and a control device 60. The sludge filter press frame 50 is arranged in the middle of a base 100; the filter cloth conveying device is used for conveying the filter cloth, and comprises 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 arranged The sludge filter press frame 50 is disposed on both sides thereof; a pressurizing device 20 is disposed above the sludge filter press frame 50, and the pressurizing device 20 is used to pressurize and dehydrate the paved sludge filter press frame 50; the mud discharge control module includes a nozzle 31 and a retractable mud conveying pipeline 32; the nozzle 31 is disposed at one end of the mud conveying pipeline 32 to provide mud to be dehydrated between the first filter cloth 111 and the second filter cloth 121; an electromagnetic control valve 33 and a flow control valve 34 for detecting the mud supply amount are disposed in the part of the mud conveying pipeline 32 close to the nozzle 31. A water content sensor 34 is provided at a portion of the slurry conveying pipeline 32 away from the nozzle 31, and a water content detection device 35 for detecting the water content of the slurry is provided. 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 provided on the inner bottom surface of the outer shell 501, a bottom plate 505 is provided at the lower part of the inner cylinder 502, filter holes are provided on the inner cylinder 502 and the bottom plate 505, and a piston rod 504 extending from the hydraulic cylinder 503 is fixed to the bottom surface of the bottom plate 505. The inner cylinder 502 is connected to control the bottom plate 505 to move up and down in the inner cylinder 502. The first filter cloth, the second filter cloth and the mud between the first filter cloth and the second filter cloth are stacked in an S-shaped manner on the bottom plate 505 of the inner cylinder 502. The scraping and pressing module 40 is arranged on the upper end surface of the sludge filter press frame 50. The scraping and pressing module 40 is used to flatten the mud and the filter cloth. The inner cylinder 502 makes the laying thickness of the mud in each layer evenly distributed. The control device 60 is connected to the electromagnetic control valve 33, the flow sensor 34, the moisture content detection device 35, and the hydraulic cylinder for communication.

[0016] The control device 60 controls the laying thickness of each layer of water slurry to be dehydrated in the inner cylinder by controlling the telescopic length of the piston rod of the hydraulic cylinder and the mud discharge amount of the mud discharge control module 30. Preferably, the laying thickness of each layer of water slurry to be dehydrated is controlled between 15-25 mm, and the laying thickness of each layer of water slurry to be dehydrated in the inner cylinder decreases from top to bottom in the inner cylinder, thereby avoiding the problem of different moisture content distribution of the upper and lower layers of sludge after dehydration, so that the moisture content of the upper and lower layers of sludge in the sludge filter press frame remains relatively consistent after dehydration.

[0017] In order to better ensure the consistency of the moisture content of each layer of mud cake after dehydration, the amount of mud to be dehydrated provided by each layer between the first filter cloth 111 and the second filter cloth 121 is Q , Q The calculation formula is: ,in h is the laying thickness of the dewatered slurry in each layer, A It is the area of ​​the cross section of the inner cylinder 222.

[0018] In order to ensure the consistency of sludge dehydration under different conditions, the laying thickness of each layer of dehydrated slurry is h The calculation formula is: , where the formula P The pressure provided to the pressurizing device, P ref The reference pressure ，W It is the moisture content of the sludge in the sludge conveying pipeline measured by the moisture content detection device. W ref is the reference moisture content (usually selected as 85%), L It is the extended length of the piston rod when 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. l is the initial extension length of the piston rod when laying the corresponding layer of dewatered slurry. According to the above formula, the greater the pressure applied by the pressure device, h The larger the water content of the dewatered slurry, h The smaller the piston rod is, the longer it is extended, that is, the closer the dewatered slurry is to the bottom of the sludge filter press frame, h By comprehensively considering various factors affecting mud dehydration, the thickness of the slurry to be dehydrated is used to determine the thickness of the slurry to be dehydrated. h The calculation formula can more accurately control the filling amount of each layer of slurry to be dewatered, ensuring the consistency of sludge dewatering under different conditions. In order to fully ensure the effect of filter pressing, when the calculation results are h When it is larger than 25mm, h The value is set to 25mm, which means that each layer of sludge filling is within 25mm. By controlling the optimal laying thickness of each layer of sludge cloth, part of the intracellular water in the sludge is efficiently released, the filter pressing speed is increased, and the energy consumption is reduced. Sludge with a water content of about 85% can be reduced without or with less addition of chemicals.

[0019] As a better implementation, a sludge wall breaking pump is provided at the front end of the mud conveying pipeline 32, and the sludge wall breaking pump conveys the mud to the mud discharge control module. The sludge wall breaking pump provided at the front end can better release the intracellular water in the sludge.

[0020] In order to avoid the influence of the scraping and pressing module on the transmission of the filter cloth during the laying of the filter cloth and mud in the sludge filter press frame, a scraper is provided on the scraping and pressing module, and the scraper in the scraping and pressing module is arranged to be rotatable, that is, when the filter cloth needs to be scraped, the scraper is rotated to the lower side and scrapes the filter cloth by lateral movement; when scraping is not needed, the scraper is rotated to the upper side to avoid affecting the transmission of the filter cloth.

[0021] A guide rail is arranged on the base, and the sludge filter press frame 50 is arranged in a movable manner. A guide wheel is arranged at the bottom of the sludge filter press frame 50, and the guide wheel cooperates with the guide rail to facilitate the movement of the sludge filter press frame.

[0022] The mud spraying direction of the nozzle 31 can be controlled. In the process of controlling the mud discharge, the mud spraying direction of the nozzle 31 can be set to rotate at a uniform 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.

[0023] In order to avoid different moisture contents at different positions of the mud cake of the same layer, that is, the moisture content of the dehydrated sludge of the same layer is high in the middle and low at the edge, water guide ribs 101 are arranged on the opposite surfaces of the first filter cloth 111 and the second filter cloth 121, that is, the water guide ribs 101 are arranged on the surfaces of the first filter cloth 111 and the second filter cloth 121 that are in contact with the sludge, the water guide ribs 101 are arranged along the width direction of the first filter cloth 111 and the second filter cloth 121, and a plurality of water guide ribs 101 are evenly distributed along the length direction of the first filter cloth 111 and the second filter cloth 121. The water guide ribs 101 are hollow tubular structures, and a plurality of drainage holes 1011 are arranged on the surface of the water guide ribs and along the length direction of the water guide ribs. The distribution of the plurality of drainage holes 1011 along the length direction of the water guide ribs is dense in the middle and sparse at the ends, so that the water that is difficult to be discharged from the sludge in the middle part has sufficient flow path to be discharged outside the inner cylinder. During the process of pressurizing the sludge, since the water guide ribs are arranged horizontally through the filter cloth, it is possible to ensure that the water in the mud cake near the center of the filter press frame can be discharged smoothly. By arranging the water guide ribs on the first filter cloth and the second filter cloth, it is convenient to discharge the water in the mud cake near the center of the filter press frame, so that the water content of the mud cake at different positions on the same layer is more consistent, avoiding the distribution of the water content of the mud cake on the same layer being more in the middle and less at the edge.

[0024] In order to ensure the effect of water discharge from the mud cake near the center of the filter press frame, the distribution density of the water guide ribs 101 along the length direction of the first filter cloth 111 and the second filter cloth 121 is to ensure that 2-3 water guide ribs are provided on each layer of the first filter cloth 111 and the second filter cloth 121 folded on the sludge filter press frame 50.

[0025] In order to further enable the water guiding ribs to more fully discharge the moisture from each cross section of the mud cake, the water guiding ribs on the first filter cloth 111 and the second filter cloth 121 are arranged in a staggered manner.

[0026] Example 2 Figure 4 The flow chart of the control method of the low energy consumption sludge deep filter press device is shown, and the control method specifically comprises the following steps: S1: Adjust the low-energy sludge deep filter press device to the initial state, close the electromagnetic control valve, and control the length of 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 surface of the sludge filter press frame; S2: The control device 60 determines the laying thickness of each layer of the slurry to be dewatered according to the moisture content of the slurry to be dewatered in the mud control module detected by the moisture content detection device 35 and the pressure of the pressurizing device 20. h ; Extend the sludge conveying pipeline 32 so that the nozzle 31 is placed above the center of the sludge filter press frame 50; S3: The length of the piston rod of the hydraulic cylinder that controls the contraction is y , y = h +2 c ,in c is the laying thickness of the first filter cloth and the second filter cloth; S4: Control the first winding roller 11 to rotate and lay the first filter cloth in the inner drum. The control device 60 opens the electromagnetic control valve 33 to spray the dewatered slurry on the first filter cloth laid in the inner drum. The flow sensor 34 detects the amount of slurry sprayed by the mud control module 30 to reach the layer of dewatered slurry. Q When the water is removed from the filter cloth, the control device 60 closes the electromagnetic control valve 33, and then controls the second winding roller 12 to rotate to lay the second filter cloth on the water slurry to be dewatered, and then the first filter cloth, the second filter cloth and the water slurry to be dewatered between the first filter cloth and the second filter cloth are flattened on the upper surface of the second filter cloth by the scraping module 40; S5: Repeat step S3, control the second winding roller 12 to rotate and fold the second filter cloth in the sludge filter press frame, the control device 60 opens the electromagnetic control valve 33, sprays the slurry to be dewatered on the second filter cloth, and the flow sensor 34 detects the amount of slurry sprayed by the mud control module 30 reaching the layer of slurry to be dewatered. Q When the water is removed from the filter cloth, the control device 60 closes the electromagnetic control valve 33, and then controls the first winding roller 11 to rotate to lay the first filter cloth on the water slurry to be dewatered, and then the first filter cloth, the second filter cloth and the water slurry to be dewatered between the two are flattened on the upper surface of the first filter cloth by the scraping module 40; S6: Repeat steps S3-S5 until the bottom plate 505 moves to the bottom of the inner tube, and the cloth laying is completed; S7: Contract the sludge conveying pipeline 32 so that the projection of the nozzle 31 in the vertical direction is out of the sludge filter press frame 50, start the pressurizing device 20 to pressurize the sludge with water to be dehydrated in the sludge filter press frame 50, and keep it for a specified time so that the sludge to be dehydrated is fully dehydrated.

[0027] In order to better illustrate the effect of the example of the present invention, the results of the control experiment are shown in Table 1. The control group and the test group are both subjected to extrusion experiments on municipal sludge slurry with a moisture content of 83.59%. The control group uses a filter cloth without water guide ribs, and the laying thickness of the sludge in the upper and lower layers in the sludge filter press frame is the same. The experimental example uses the squeezing method of the present invention, that is, a filter cloth with water guide ribs is used, and the laying thickness of each layer of the sludge to be dewatered in the sludge filter press frame is reduced from top to bottom in the inner cylinder. After squeezing, the mud cakes located in the center of the upper, middle and lower layers of the sludge filter press frame are tested respectively. According to the results shown in Table 1, in the control group, the moisture content of the upper layer is the lowest, the middle layer is the second, and the lower layer is the highest after squeezing, and the difference in moisture content between the upper and lower layers is greater than 5%. In the test example adopted according to the technical solution of the present invention, the moisture content of the upper and lower layers after squeezing is basically the same, and the difference is controlled within 1%, and compared with the control example, it can be seen that the moisture content of the center of each layer, especially the middle and lower layers, decreases significantly. In summary, the implementation of the present invention can ensure that the moisture content of the sludge in the upper and lower layers in the sludge filter press frame remains relatively consistent after dehydration, so that part of the intracellular water in the sludge is efficiently released, the filter press speed is increased, and the filter press effect is improved.

[0028] Table 1 Control experiment results

[0029] Through the above embodiments, the purpose of the present invention is fully and effectively achieved. Those skilled in the art can understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Although the present invention has been described with respect to the most practical and preferred embodiments currently considered, it should be understood that the present invention is not limited to the disclosed embodiments, and any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. A low-energy sludge deep filter press device, comprising a filter cloth conveyor, a mud discharge control module, a scraping and pressing module, a sludge filter press frame, and a control device. The sludge filter press frame is arranged in the middle of the base. The filter cloth conveyor is used to control the winding of the first filter cloth and the second filter cloth. The device is characterized in that: The mud discharge control module includes a nozzle and a retractable mud delivery pipeline. The nozzle is arranged at one end of the mud delivery pipeline. A solenoid control valve, a flow sensor and a water content detection device for detecting the water content of the mud are arranged in the part of the mud delivery pipeline close to the nozzle. The sludge filter press frame comprises an outer shell and an inner cylinder, the inner cylinder is nested inside 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 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 in the inner cylinder, and the first filter cloth, the second filter cloth and the mud between the two are stacked on the bottom plate of the inner cylinder in an S-shaped manner; A pressurizing device is arranged above the sludge filter press frame, and a scraping and pressing module is arranged on the upper end surface of the sludge filter press frame; The control device is connected to the electromagnetic control valve, flow sensor, moisture content detection device, and hydraulic cylinder, and controls the laying thickness of each layer of dewatered slurry in the inner tube by controlling the telescopic length of the piston rod of the hydraulic cylinder and the mud output of the mud output control module. h , laying thickness h Lower from top to bottom in the inner tube.

2. A low energy consumption sludge deep filter press device according to claim 1, characterized in that: The laying thickness of each layer of dewatered cement slurry is controlled between 15-25mm.

3. A low energy consumption sludge deep filter press device according to claim 1, characterized in that: The laying thickness of each layer of cement slurry to be dewatered h The calculation formula is: ,in P The pressure provided to the pressurizing device, P ref is the reference pressure of the pressurizing device, W It is the moisture content of the sludge in the sludge conveying pipeline measured by the moisture content detection device. W ref is the reference moisture content, L It is the extended length of the piston rod when 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. l It is the initial extended length of the piston rod when laying the corresponding layer of cement slurry to be dewatered.

4. A low energy consumption sludge deep filter press device according to claim 1, characterized in that: A sludge wall-breaking pump is arranged at the front end of the sludge conveying pipeline.

5. The low energy consumption sludge deep filter press device according to claim 1, characterized in that: Water guiding ribs are arranged on the opposite surfaces of the first filter cloth and the second filter cloth, and are arranged along the width direction of the first filter cloth and the second filter cloth. A plurality of water guiding ribs are evenly distributed along the length direction of the first filter cloth and the second filter cloth. The water guiding ribs are hollow tubular structures, and a plurality of drainage holes are arranged on the surface of the water guiding ribs and along the length direction of the water guiding ribs.

6. A low energy consumption sludge deep filter press device according to claim 5, characterized in that: The distribution of the plurality of drainage holes along the length direction of the water guiding rib is dense in the middle and sparse at the ends.

7. A low energy consumption sludge deep filter press device according to claim 6, characterized in that: The water-guiding ribs on the first filter cloth and the second filter cloth are arranged in a staggered manner.

8. A low energy consumption sludge deep filter press device according to claim 6, characterized in that: 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 on the sludge filter press frame.

9. A control method for a low energy consumption sludge deep filter press device as claimed in any one of claims 1 to 8, characterized in that: The method comprises the following steps: S1: The deep filter press device is adjusted to the initial state, and the length of the piston rod of the hydraulic cylinder is controlled to extend 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; S2: The control device determines the laying thickness of each layer of the slurry to be dewatered according to the moisture content of the slurry to be dewatered in the mud control module detected by the moisture content detection device and the pressure of the pressurizing device. h ; S3: Control the piston rod of the hydraulic cylinder to retract downward, and the retracted length is y = h +2 c ,in c is the laying thickness of the first filter cloth and the second filter cloth; S4: Lay the first filter cloth in the inner drum, and the control device controls the mud discharge control module to spray the dewatered slurry on the first filter cloth laid in the inner drum. When the sprayed slurry reaches the amount of the dewatered slurry in the layer, Q When the sludge is sprayed out, the second filter cloth is laid on the water slurry to be dewatered, and the first filter cloth, the second filter cloth and the water slurry to be dewatered between the two are flattened on the upper surface of the second filter cloth by a scraping module; S5: Repeat step S3, fold the second filter cloth in the sludge filter press frame, spray the slurry to be dewatered on the second filter cloth, and when the sprayed slurry reaches the amount of the slurry to be dewatered in the layer Q When the sludge is sprayed out, the first filter cloth is laid on the water slurry to be dewatered, and then the first filter cloth, the second filter cloth and the water slurry to be dewatered are flattened on the upper surface of the first filter cloth by a scraping module; S6: Repeat steps S3-S5 until the bottom plate moves to the bottom of the inner tube and the paving is completed; S7: Start the pressurizing device to pressurize the slurry with water to be dehydrated in the sludge filter press frame, so that the slurry to be dehydrated is fully dehydrated.

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