Coastal black and odorous sludge pretreatment device

Abstract

The invention provides a coastal black and odorous sludge pretreatment device, and belongs to the technical field of waste treatment, and the coastal black and odorous sludge pretreatment device comprises a base, a stirring system and a filtering and pressing device; the base is of a rectangular metal frame structure and is formed by welding high-strength stainless steel profiles, the four corners of the bottom of the base are each provided with a height-adjustable supporting leg, the bottoms of the supporting legs are made of rubber materials, and the base can effectively absorb shock and prevent skid. The stirring system comprises a plurality of stirrers which are arranged in parallel; each stirrer comprises a stirring barrel, a stirring shaft, a driving device, an additive inlet and a black and odorous sludge inlet; the stirring barrel is in a vertical cylinder shape and is made of a corrosion-resistant 316L stainless steel material, the thickness of the cylinder wall is not smaller than 8 mm, the interior of the stirring barrel is coated with a polytetrafluoroethylene anti-sticking coating, the cylinder bottom is designed to be conical, discharging of materials is facilitated, the outer portion of a cylinder body is wrapped with a heat preservation layer, the heat preservation layer is made of a closed-cell foam material, and the thickness of the heat preservation layer is 50 mm.

Description

Technical Field

[0001] The invention belongs to the technical field of waste treatment, and in particular relates to a coastal black and smelly sludge pre-treatment device. Background Art

[0002] Black and smelly sludge in coastal areas is a special type of industrial waste. The sludge contains a large amount of pollutants such as organic matter, heavy metals, pathogens, etc. If it is directly discharged, it will seriously harm the local water environment and ecosystem. Therefore, it is necessary to effectively pre-treat the black and smelly sludge to reduce the content of pollutants in it, thereby reducing the difficulty and cost of subsequent treatment and disposal.

[0003] At present, the main technologies for treating black and smelly sludge include physical and chemical methods, biological methods, and pyrolysis methods. The physical and chemical methods mainly use flocculation sedimentation, electrochemical oxidation and other means to remove suspended matter, heavy metals, etc. in the sludge; the biological method uses the degradation of microorganisms to decompose organic pollutants in the sludge; the pyrolysis method destroys the molecular structure of organic matter through high-temperature cracking. However, these methods all have certain limitations.

[0004] Although the physical and chemical methods can fundamentally reduce the content of pollutants, the treatment cost is high, and the chemical sludge produced needs further treatment. The biological method takes a long time to process, has low efficiency, and is difficult to meet the needs of rapid processing. The pyrolysis method consumes a lot of energy, is complex to operate, and is prone to secondary pollution.

[0005] After the above treatment, the sludge is sent to the sludge pile shed by the inclined belt conveyor and transported out regularly. The physical and mechanical properties of these treated sludges are not as good as the original soil, and it is difficult to meet the requirements of bearing capacity and stability required for engineering filling or soil improvement. Therefore, it cannot be effectively reused and is significantly limited in resource utilization.

[0006] In addition, most of the above technical methods are aimed at black and smelly sludge on land, and lack targeted solutions for black and smelly sludge unique to coastal areas. This type of sludge often contains high salinity and special microbial communities, making it difficult for traditional technologies to be effectively applied. Summary of the invention

[0007] The present invention is achieved in that:

[0008] The present invention provides a coastal black and smelly sludge pre-treatment device, which comprises: a base, a stirring system and a filter pressure device;

[0009] The base is a rectangular metal frame structure, welded from high-strength stainless steel profiles, with a height-adjustable support foot at each of the four corners. The bottom of the support foot is made of rubber, which can effectively reduce shock and prevent slipping;

[0010] The stirring system comprises a plurality of stirrers arranged in parallel, each of which comprises a stirring barrel, a stirring shaft, a driving device, an additive inlet and a black and smelly sludge inlet;

[0011] The mixing barrel is a vertical cylindrical barrel made of corrosion-resistant 316L stainless steel, with a barrel wall thickness of not less than 8 mm, a polytetrafluoroethylene anti-stick coating on the inside, and a conical bottom design to facilitate the discharge of materials. The outside of the barrel is wrapped with an insulation layer made of closed-cell foam material with a thickness of 50 mm.

[0012] The stirring shaft is vertically arranged at the center of the stirring barrel, and is made of high-strength alloy steel. The surface is chrome-plated to enhance corrosion resistance. Multiple layers of stirring blades are evenly distributed along the axial direction of the stirring shaft. The stirring blades are detachable for easy replacement and cleaning.

[0013] The driving device includes a variable frequency motor, a reducer and a coupling. The variable frequency motor is fixedly connected to the top of the mixing barrel through a flange. The reducer is installed between the variable frequency motor and the mixing shaft and is connected to the mixing shaft through a coupling to achieve power transmission.

[0014] The additive inlet is arranged at the top of the mixing barrel, and includes a funnel-shaped feed port and an electric valve. The funnel-shaped feed port is made of corrosion-resistant polypropylene material, and the electric valve adopts a pneumatic butterfly valve for realizing remote control.

[0015] The black and smelly sludge inlet is arranged on the upper side wall of the mixing barrel, including a flange connection port and an electric gate valve. The flange connection port adopts the standard DN150 specification, and the electric gate valve is made of a corrosion-resistant rubber lining material;

[0016] The filter pressure device is connected to the outlet of the stirring system and includes a feed pump, a plate and frame filter press and a conveyor belt;

[0017] The feed pump is a screw pump, which adopts frequency conversion speed control, the pump body is made of wear-resistant alloy, and the seal adopts mechanical seal;

[0018] The plate-and-frame filter press is composed of a number of filter plates, the filter plates are made of polypropylene, and the filter cloth is made of polypropylene monofilament filter cloth, which has good acid and alkali resistance and filtering effect;

[0019] The conveyor belt is located below the plate and frame filter press and is used to convey the formed pre-treated soil cake. The conveyor belt is made of corrosion-resistant PVC material and has anti-slip texture on the surface.

[0020] On the basis of the above technical solution, the coastal black and smelly sludge pretreatment device of the present invention can also be improved as follows:

[0021] Wherein, the stirring blades include upper blades, middle blades and lower blades;

[0022] The upper blades are inclined blades with an inclination angle of 45 degrees, which are used to push the material downward;

[0023] The middle blades are flat blades, distributed in a spiral shape, and are used for radial stirring;

[0024] The lower blades are conical blades, which can effectively prevent the material from settling at the bottom of the cylinder;

[0025] All blades are made of duplex 2205 stainless steel, which has excellent strength and corrosion resistance, and the blade edges are chamfered to reduce turbulence and energy loss;

[0026] The blades and the stirring shaft are connected by a dovetail groove and fixed by fastening bolts, which is easy to disassemble and replace.

[0027] Furthermore, a discharge port is provided at the bottom of the mixing barrel, and the discharge port is connected to a pneumatic butterfly valve and a soft connecting pipe;

[0028] The pneumatic butterfly valve adopts a fully sealed design. The valve body is made of CF8M stainless steel, the valve plate is made of polytetrafluoroethylene, and the sealing ring is made of EPDM material, which has good corrosion resistance and sealing performance.

[0029] The soft connecting pipe is made of food-grade silicone, which has good flexibility and corrosion resistance. Both ends are connected to the pneumatic butterfly valve and feed pump through quick connectors, which is easy to disassemble and clean.

[0030] Furthermore, the variable frequency motor is explosion-proof, with a power range of 5.5-15kW, a speed range of 0-1500rpm, and a protection level of IP55;

[0031] The reducer is of planetary gear type, with an adjustable reduction ratio of 5:1 to 10:1, oil bath lubrication, and a sealing grade of IP66;

[0032] The coupling is an elastic coupling, which consists of two half couplings and an elastic element, and can compensate for axial, radial and angular deviations and reduce vibration and noise.

[0033] Furthermore, it also includes a cleaning system, which includes a high-pressure water pump, a rotating nozzle and a cleaning pipeline;

[0034] The high-pressure water pump is a vertical multi-stage centrifugal pump with a maximum working pressure of 6MPa and adjustable flow rate;

[0035] The rotating nozzle is installed on the top of the mixing barrel. It adopts a double-axis design and can rotate 360 ​​degrees. The nozzle is made of hard alloy material and is wear-resistant.

[0036] The cleaning pipeline is made of 304 stainless steel with a diameter of DN25 and is connected to the high-pressure water pump and rotating nozzle through a quick connector.

[0037] Furthermore, the plate and frame filter press also includes a hydraulic system and an automatic plate pulling system.

[0038] The hydraulic system consists of a hydraulic pump station, a hydraulic cylinder and a solenoid valve, with a maximum working pressure of 30MPa, which can achieve precise control of the clamping force;

[0039] The automatic plate pulling system includes a servo motor, a gear rack mechanism and a plate pulling trolley, which can automatically open and close the filter press plate to improve work efficiency.

[0040] Furthermore, it also includes a deodorization system, which includes an air collecting hood, an induced draft fan, an activated carbon adsorption tower and an exhaust pipe;

[0041] The gas collecting hood is set above the stirring system and the filter pressure device. It is made of 304 stainless steel and has a soft curtain on the edge to increase the collection efficiency.

[0042] Furthermore, the activated carbon adsorption tower adopts a double-layer design and is filled with honeycomb activated carbon, and the adsorption efficiency is ≥90%.

[0043] Furthermore, the height of the exhaust chimney is not less than 15 meters, and a rain cover and a sampling platform are provided on the top.

[0044] Furthermore, the induced draft fan is an anti-corrosion centrifugal fan with adjustable air volume and a maximum air pressure of 3000Pa.

[0045] Furthermore, the coastal black and smelly sludge pretreatment device provided by the present invention also includes a control system, the control system includes a central control unit, a human-machine interface, multiple sensors and actuators, the central control unit adopts a programmable logic controller (PLC), the human-machine interface adopts a touch screen, which is installed on the front panel of the control cabinet, the sensors include a liquid level sensor, a pressure sensor and a temperature sensor, and the actuator includes a control circuit of each motor, pump and valve; the programmable logic controller performs the following steps:

[0046] (1) System initialization: After startup, the controller first performs a self-test to check the communication status of each sensor and actuator. If all are normal, it enters the standby state. If an abnormality is detected, an error message is displayed on the human-machine interface.

[0047] (2) Parameter setting: The operator inputs the process parameters through the touch screen, including but not limited to the speed of each agitator, stirring time, additive ratio, filtration pressure time, etc., and the controller stores these parameters in the non-volatile memory;

[0048] (3) Startup preparation: The controller performs the following operations in sequence:

[0049] a. Check the liquid level of each mixing drum to ensure it is below the safe level;

[0050] b. Close all feed valves and discharge valves;

[0051] c. Start the deodorization system, and turn on the induced draft fan and air collecting hood;

[0052] d. Check the status of the filter pressure device and ensure it is in standby mode;

[0053] (4) Feed control: The controller opens the electric valves of the black and smelly sludge inlet and the additive inlet in sequence according to the preset ratio, and at the same time starts the liquid level sensor to monitor the material level in the mixing drum in real time. When the set liquid level is reached, the feed valve is automatically closed;

[0054] (5) Stirring process control: The controller starts the variable frequency motor, adjusts the stirring speed according to the preset parameters, and starts the timer at the same time. During the stirring process, the motor current, stirring shaft torque and other parameters are monitored in real time. If an abnormality is detected, the machine will be stopped immediately and an alarm will be issued;

[0055] (6) Discharge control: After the mixing is completed, the controller opens the pneumatic butterfly valve and feed pump at the bottom of the mixing drum to transport the mixed materials to the plate and frame filter press, while monitoring the pipeline pressure to prevent blockage;

[0056] (7) Filtration process control: The controller starts the hydraulic system of the plate and frame filter press, controls the pressing force to gradually increase to the set value, and monitors the filtrate flow and pressure at the same time. When the filtrate flow drops to the set value or reaches the maximum filtration pressure time, the filtration process is automatically ended;

[0057] (8) Discharging control: After the filtration pressure is completed, the controller starts the automatic plate pulling system, opens the filter press plates in sequence, and allows the pre-treated soil cake to fall onto the conveyor belt. At the same time, the conveyor belt motor is started to transport the soil cake to the designated location;

[0058] (9) Cleaning control: After a batch of processing is completed, the controller starts the cleaning system, turns on the high-pressure water pump and the rotating nozzle to flush the inside of the mixing drum. The cleaning time is adjustable, and the water pump is automatically turned off after the cleaning is completed;

[0059] (10) Data recording and uploading: During the whole process, the controller records various process parameters in real time, including stirring time, stirring speed, material temperature, filtration pressure, filtration time, etc., and regularly uploads these data to the central database for subsequent analysis and optimization.

[0060] Furthermore, the black and smelly sludge inlet is connected to a preset sludge temporary storage tank through a pipeline. The sludge temporary storage tank is used to temporarily store the sludge excavated by the excavation equipment. It can be well transmitted to the black and smelly sludge inlet through the pipeline, which can effectively realize the convenient transmission of sludge and avoid pipeline blockage caused by sludge squeezing.

[0061] Compared with the prior art, the beneficial effects of the coastal black and smelly sludge pretreatment device provided by the present invention are: it can effectively remove pollutants in the sludge, reduce the volume, and create conditions for subsequent deep treatment or resource utilization. The device mainly includes the following innovative points:

[0062] 1. Use corrosion-resistant materials: Most of the parts in the device that come into contact with sludge, such as the mixing barrel, mixing shaft, filter cloth, etc., are made of highly corrosion-resistant materials such as stainless steel and polypropylene, which can resist acid, alkali and salt corrosion in the sludge.

[0063] 2. Optimized stirring mechanism: The stirring barrel adopts a vertical design, and the stirring shaft is equipped with multiple layers of blades along the axial direction, including inclined blades, spiral blades and conical blades, which can fully stir and prevent material sedimentation. The stirring speed can be adjusted by the frequency conversion motor to meet the stirring needs at different stages.

[0064] 3. Integrated filter pressing technology: The device combines the stirring system with the plate and frame filter press to form an integrated dehydration device. During the filtration process, the pressure can be accurately controlled by the hydraulic system, greatly improving the dehydration efficiency. At the same time, an automatic plate pulling system is set to improve the operation efficiency.

[0065] 4. Set up a deodorization system: Install a gas collection hood above the mixing system and filter press, and equip it with an induced draft fan and an activated carbon adsorption tower to effectively capture and degrade the malodorous gases generated during the operation of the device.

[0066] 5. Intelligent control: The device is equipped with a PLC control system, which can realize automatic control and optimization adjustment of key process parameters such as feeding, stirring, dehydration, and cleaning, greatly reducing the difficulty of manual operation. At the same time, various process data are recorded to provide a basis for subsequent optimization.

[0067] In summary, the present invention targets the characteristics of coastal black and smelly sludge, adopts corrosion-resistant materials, optimizes the stirring mechanism, integrates filtration and pressure technology, sets up a deodorization system, realizes intelligent control and other measures, and significantly improves the processing efficiency and automation level compared with the existing technology. It is a practical coastal black and smelly sludge pretreatment device. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0069] Figure 1 It is a cross-sectional view of a coastal black and smelly sludge pre-treatment device;

[0070] Figure 2 It is a front view of a coastal black and smelly sludge pre-treatment device;

[0071] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0072] 10. Base; 11. Agitator; 111. Agitating barrel; 112. Agitating shaft; 113. Driving device; 1131. Frequency conversion motor; 1132. Reducer; 1133. Coupling; 114. Additive inlet; 1141. Funnel-shaped feed port; 1142. Electric valve; 115. Black and smelly sludge inlet; 116. Agitating blades; 12. Filter pressure device; 121. Feed pump; 122. Plate and frame filter press; 123. Conveyor belt; 13. Discharge port; 14. Cleaning system; 141. High-pressure water pump; 142. Rotating nozzle; 143. Cleaning pipeline; 15. Deodorization system; 151. Air collecting hood; 152. Induced draft fan; 153. Activated carbon adsorption tower; 154. Exhaust pipe. DETAILED DESCRIPTION

[0073] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0074] like Figure 1 , 2 is an embodiment of a coastal black and smelly sludge pretreatment device provided by the present invention, in this embodiment, comprising: a base 10, a stirring system and a filter pressure device 12;

[0075] The base 10 is a rectangular metal frame structure, which is welded from high-strength stainless steel profiles. Each of the four corners of the bottom is provided with a height-adjustable support foot, and the bottom of the support foot is made of rubber material, which can effectively reduce shock and prevent slipping;

[0076] The stirring system includes a plurality of stirrers 11 arranged in parallel, each of which includes a stirring barrel 111, a stirring shaft 112, a driving device 113, an additive inlet 114 and a black and smelly sludge inlet 115;

[0077] The mixing barrel 111 is vertical cylindrical and made of corrosion-resistant 316L stainless steel. The barrel wall thickness is not less than 8 mm. The inside is coated with polytetrafluoroethylene anti-stick coating. The bottom of the barrel is conical in design, which is conducive to the discharge of materials. The outside of the barrel is wrapped with an insulation layer, which is made of closed-cell foam material and has a thickness of 50 mm.

[0078] The stirring shaft 112 is vertically arranged at the center of the stirring barrel 111, and is made of high-strength alloy steel. The surface is chrome-plated to enhance corrosion resistance. Multiple layers of stirring blades 116 are evenly distributed along the axial direction of the stirring shaft 112. The stirring blades 116 are detachable for easy replacement and cleaning.

[0079] The driving device 113 includes a variable frequency motor 1131, a reducer 1132 and a coupling 1133. The variable frequency motor 1131 is fixedly connected to the top of the mixing barrel 111 through a flange. The reducer 1132 is installed between the variable frequency motor 1131 and the mixing shaft 112 and is connected to the mixing shaft 112 through the coupling 1133 to achieve power transmission.

[0080] The additive inlet 114 is arranged at the top of the mixing barrel 111, and includes a funnel-shaped feed port 1141 and an electric valve 1142. The funnel-shaped feed port 1141 is made of corrosion-resistant polypropylene material, and the electric valve 1142 is a pneumatic butterfly valve for realizing remote control.

[0081] The black and smelly sludge inlet 115 is arranged on the upper side wall of the mixing barrel 111, and includes a flange connection port and an electric gate valve. The flange connection port adopts a standard DN150 specification, and the electric gate valve is made of a corrosion-resistant rubber lining material;

[0082] The filter press device 12 is connected to the outlet of the stirring system, and includes a feed pump 121, a plate and frame filter press 122 and a conveyor belt 123;

[0083] The feed pump 121 is a screw pump, which adopts frequency conversion speed control, the pump body is made of wear-resistant alloy, and the seal adopts mechanical seal;

[0084] The plate and frame filter press 122 is composed of a plurality of filter plates, the filter plates are made of polypropylene, and the filter cloth is made of polypropylene monofilament filter cloth, which has good acid and alkali resistance and filtering effect;

[0085] The conveyor belt 123 is located below the plate and frame filter press 122 and is used to convey the formed pre-treated soil cake. The conveyor belt 123 is made of corrosion-resistant PVC material and has anti-slip textures on the surface.

[0086] It also includes a control system, which includes a central control unit, a human-machine interface, multiple sensors and actuators. The central control unit adopts a programmable logic controller (PLC), and the human-machine interface adopts a touch screen installed on the front panel of the control cabinet. The sensors include a liquid level sensor, a pressure sensor and a temperature sensor. The actuator includes control circuits of various motors, pumps and valves. The programmable logic controller performs the following steps:

[0087] (1) System initialization: After startup, the controller first performs a self-test to check the communication status of each sensor and actuator. If all are normal, it enters the standby state. If an abnormality is detected, an error message is displayed on the human-machine interface.

[0088] (2) Parameter setting: The operator inputs the process parameters through the touch screen, including but not limited to the rotation speed, stirring time, additive ratio, filtration pressure time, etc. of each stirrer 11, and the controller stores these parameters in the non-volatile memory;

[0089] (3) Startup preparation: The controller performs the following operations in sequence:

[0090] a. Check the liquid level of each mixing barrel 111 to ensure that it is below the safe liquid level;

[0091] b. Close all feed valves and discharge valves;

[0092] c. Start the deodorization system 15, turn on the induced draft fan 152 and the air collecting hood 151;

[0093] d. Check the status of the filter pressure device 12 to ensure that it is in standby mode;

[0094] (4) Feed control: The controller opens the electric valves 1142 of the black and smelly sludge inlet 115 and the additive inlet 114 in sequence according to the preset ratio, and simultaneously starts the liquid level sensor to monitor the material level in the mixing barrel 111 in real time. When the set liquid level is reached, the feed valve is automatically closed;

[0095] (5) Stirring process control: The controller starts the variable frequency motor 1131, adjusts the stirring speed according to the preset parameters, and starts the timer at the same time. During the stirring process, the motor current, the torque of the stirring shaft 112 and other parameters are monitored in real time. If an abnormality is detected, the machine is immediately shut down and an alarm is issued;

[0096] (6) Discharge control: After the mixing is completed, the controller opens the pneumatic butterfly valve at the bottom of the mixing barrel 111 and the feed pump 121 to transport the mixed materials to the plate and frame filter press 122, while monitoring the pipeline pressure to prevent blockage;

[0097] (7) Filtration process control: The controller starts the hydraulic system of the plate and frame filter press 122, controls the pressing force to gradually increase to a set value, and monitors the filtrate flow and pressure at the same time. When the filtrate flow drops to a set value or reaches the maximum filtration pressure time, the filtration process is automatically terminated;

[0098] (8) Discharging control: After the filtration pressure is completed, the controller starts the automatic plate pulling system, opens the filter press plates in sequence, and allows the pre-treated soil cake to fall onto the conveyor belt 123. At the same time, the conveyor belt 123 motor is started to transport the soil cake to the designated location;

[0099] (9) Cleaning control: After a batch of processing is completed, the controller starts the cleaning system 14, turns on the high-pressure water pump 141 and the rotating nozzle 142, and rinses the inside of the mixing barrel 111. The cleaning time is adjustable, and the water pump is automatically turned off after the cleaning is completed;

[0100] (10) Data recording and uploading: During the whole process, the controller records various process parameters in real time, including stirring time, stirring speed, material temperature, filtration pressure, filtration time, etc., and regularly uploads these data to the central database for subsequent analysis and optimization.

[0101] Among them, in the above technical solution, the stirring blade 116 includes an upper blade, a middle blade and a lower blade;

[0102] The upper blades are inclined blades with an inclination angle of 45 degrees, which are used to push the material downward;

[0103] The middle blades are flat blades, distributed in a spiral shape, and are used for radial stirring;

[0104] The lower blades are conical blades, which can effectively prevent the material from settling at the bottom of the cylinder;

[0105] All blades are made of duplex 2205 stainless steel, which has excellent strength and corrosion resistance, and the blade edges are chamfered to reduce turbulence and energy loss;

[0106] The blades are connected to the stirring shaft 112 by a dovetail groove and fixed by fastening bolts, so as to facilitate disassembly and replacement.

[0107] Furthermore, in the above technical solution, a discharge port 13 is provided at the bottom of the mixing barrel 111, and the discharge port 13 is connected to a pneumatic butterfly valve and a soft connecting pipe;

[0108] The pneumatic butterfly valve adopts a fully sealed design. The valve body is made of CF8M stainless steel, the valve plate is made of polytetrafluoroethylene, and the sealing ring is made of EPDM material, which has good corrosion resistance and sealing performance.

[0109] The soft connecting pipe is made of food-grade silicone, which has good flexibility and corrosion resistance. Both ends are connected to the pneumatic butterfly valve and the feed pump 121 through quick connectors, which is easy to disassemble and clean.

[0110] Further, in the above technical solution, the variable frequency motor 1131 is explosion-proof, with a power range of 5.5-15kW, a speed range of 0-1500rpm, and a protection level of IP55;

[0111] Reducer 1132 is planetary gear type, with an adjustable reduction ratio of 5:1 to 10:1, oil bath lubrication, and IP66 sealing grade;

[0112] The coupling 1133 is an elastic coupling 1133, which is composed of two half couplings 1133 and an elastic element, and can compensate for axial, radial and angular deviations and reduce vibration and noise.

[0113] Furthermore, in the above technical solution, a cleaning system 14 is also included, and the cleaning system 14 includes a high-pressure water pump 141, a rotating nozzle 142 and a cleaning pipeline 143;

[0114] The high-pressure water pump 141 is a vertical multi-stage centrifugal pump with a maximum working pressure of 6 MPa and an adjustable flow rate;

[0115] The rotating nozzle 142 is installed on the top of the mixing barrel 111, adopts a double-axis design, can rotate 360 ​​degrees, and the nozzle is made of hard alloy material, which is wear-resistant;

[0116] The cleaning pipeline 143 is made of 304 stainless steel, has a pipe diameter of DN25, and is connected to the high-pressure water pump 141 and the rotating nozzle 142 through a quick connector.

[0117] Furthermore, in the above technical solution, the plate and frame filter press 122 also includes a hydraulic system and an automatic plate pulling system.

[0118] The hydraulic system consists of a hydraulic pump station, a hydraulic cylinder and a solenoid valve, with a maximum working pressure of 30MPa, which can achieve precise control of the clamping force;

[0119] The automatic plate pulling system includes a servo motor, a gear rack mechanism and a plate pulling trolley, which can automatically open and close the filter press plate to improve work efficiency.

[0120] Furthermore, in the above technical solution, a deodorization system 15 is also included, and the deodorization system 15 includes an air collecting hood 151, an induced draft fan 152, an activated carbon adsorption tower 153 and an exhaust pipe 154;

[0121] The gas collecting hood 151 is arranged above the stirring system and the filter pressure device 12, and is made of 304 stainless steel. A soft curtain is provided on the edge to increase the collection efficiency.

[0122] Furthermore, in the above technical solution, the activated carbon adsorption tower 153 adopts a double-layer design and is filled with honeycomb activated carbon, and the adsorption efficiency is ≥90%.

[0123] Furthermore, in the above technical solution, the height of the exhaust chimney 154 is not less than 15 meters, and a rain cover and a sampling platform are provided on the top.

[0124] Furthermore, in the above technical solution, the induced draft fan 152 is an anti-corrosion centrifugal fan with adjustable air volume and a maximum air pressure of 3000Pa.

[0125] Embodiment 1:

[0126] The present embodiment relates to a coastal black and smelly sludge pre-treatment device suitable for engineering vehicles. As a coastal area of ​​Jiaozhou Bay, the SCO Demonstration Zone has a 20m thick silt layer below the existing site elevation. According to the experience of the early construction of the "SCO Pearl" project, the silt in this area has high chloride and salt content. After excavation, it is basically liquid and has a very high water content, which makes it extremely difficult to transport. As a result, the cost of transporting the silt has increased sharply, and it will also cause great pressure on urban environmental protection. At the same time, this type of silt has good water retention, extremely slow consolidation speed, low bearing capacity, and is extremely difficult to stack. After 6 months of drying, the silt excavated from the "SCO Pearl" project only solidified on the surface of 5cm, and no hardening and consolidation occurred in the internal properties. In order to better achieve silt treatment, the engineering staff divided the silt treatment into two steps. The first step is pretreatment, using the device of the present invention to realize the addition of additives to the directly collected black and smelly sludge and simple stirring, filtration and pressure to obtain a pre-treated soil cake; the second step is to further crush the pre-treated soil cake, add the additives of the post-treatment part, and obtain usable solidified soil through processes such as uniform stirring. The additives can be activated waste residue, kaolin, cement, lime, fly ash, sawdust and other materials. The unconfined compressive strength and curing age of the solidified soil obtained after treatment are greatly improved compared with the original soil. The solidified soil obtained has a high bearing capacity and can meet the requirements of urban infrastructure construction, especially when the foundation bearing capacity is greater than the original soil. It is suitable for major projects such as highways, railways, and airport runways. The application scenarios of the prepared solidified soil are:

[0127] (1) Foundation reinforcement: In soft foundations or high water areas, solidified soil can be used to reinforce the foundation, prevent settlement or displacement, and improve the safety of the project.

[0128] (2) Filling materials: Solidified soil can be used to fill low-lying areas, improve topography, increase land utilization, and effectively reduce settlement problems.

[0129] (3) Ecological restoration: Solidified soil can also be used in ecological restoration by improving soil structure, enhancing its biocompatibility and water retention capacity, and thus helping to restore vegetation and rebuild soil ecosystems.

[0130] (4) Road and paving materials: Solidified soil can be used in the construction of road base and surface layers to improve the bearing capacity and durability of roads and extend their service life.

[0131] The device in this embodiment corresponds to the first step and is composed of the following components: a base 10, a stirring system, a filter pressing device 12, a cleaning system 14 and a deodorization system 15.

[0132] The base 10 is a rectangular metal frame structure, welded with Q235B carbon steel profiles with a thickness of 4mm. The frame size is 2.5m long × 1.8m wide × 1.5m high. There is a height-adjustable support foot at each of the four corners of the bottom, and the foot sole is made of natural rubber with a hardness of 90A and a diameter of 150mm. The adjustment bolt is of M24 specification, with an adjustment range of 100-300mm, which can adapt to the ups and downs of different road surfaces. The base 10 is sprayed with a layer of corrosion-resistant epoxy resin paint as a whole, and the surface is smooth and flat.

[0133] The stirring system comprises four stirrers 11 arranged in parallel, each of which is composed of the following components:

[0134] (1) Mixing barrel 111: vertical cylindrical, 1000 mm in diameter, 1200 mm in height, 10 mm thick, made of SUS316L stainless steel plate. The inner wall is coated with a 100 μm thick polytetrafluoroethylene anti-stick coating. The bottom of the barrel is designed to be 30° conical, which is conducive to material discharge. The outside of the barrel is wrapped with a 50 mm thick B1 grade flame retardant polyurethane foam insulation layer.

[0135] (2) Stirring shaft 112: Made of 40Cr steel, with a diameter of 100 mm and a length of 1100 mm. The surface is electroplated with 15% Cr to improve corrosion resistance. There are three layers of stirring blades 116 evenly distributed along the axial direction of the shaft, with 8 blades in each layer.

[0136] The upper blades are 45° inclined blades, with dimensions of 160mm×80mm×8mm, and made of 2205 duplex stainless steel; the middle blades are flat blades, with dimensions of 200mm×100mm×8mm, spirally distributed, and made of the same material as the upper blades; the lower blades are 150mm high conical blades, made of the same material as above. All blade edges are chamfered with R5mm.

[0137] The blades are connected to the stirring shaft 112 with a dovetail groove of 20 mm width and fixed with M16×40 mm hexagonal bolts for easy disassembly and replacement.

[0138] (3) Driving device 113: includes a 7.5kW CGSL711-4 four-pole explosion-proof variable frequency motor 1131 (IP55, bearing life L10 ≥ 30000h), a gear reducer and an elastic coupling 1133.

[0139] The variable frequency motor 1131 is flange mounted on the top of the mixing barrel 111. The reducer model is R97DRE90L4, the reduction ratio is 8:1, the structure is a planetary gear, FUCHS Renolit CX-EP2 lubricant is used, and the housing protection level is IP66. The coupling 1133 model is GE14, which consists of two couplings 1133 and a polyurethane elastic element, and can compensate for deviations in three directions: axial, radial and angular.

[0140] (4) Additive inlet 114: It is arranged on the top of the mixing barrel 111 and consists of a DN150 flange interface and a pneumatic butterfly valve. The flange is made of SUS316L, the butterfly valve is D71X-16, the valve body and valve disc are made of CF8M and polytetrafluoroethylene respectively, the sealing ring is EPDM rubber, and the working pressure is 0.2-1.0MPa.

[0141] (5) Black and smelly sludge inlet 115: It is set on the upper side wall of the mixing barrel 111 and consists of a DN150 flange interface and an electric gate valve. The flange material is the same as above, the electric gate valve model is Z41W-16P, the valve body and valve core are both made of metal lining rubber, the seal is PTFE, IP68 protection level, and the working pressure is 0.1-1.0MPa.

[0142] The filter press device 12 is composed of the following components:

[0143] (1) Feed pump 121: G-type screw pump, pump body made of GH4169 steel, rotor and stator made of Ni-Cr-Si wear-resistant alloy. The maximum flow rate of this pump is 120m 3 / h, maximum head is 15m, motor power is 15kW, speed range is 300-1500rpm, IP55 protection grade.

[0144] (2) Plate and frame filter press 122: It is composed of 10 PB1000 polypropylene filter plates. The size of each plate is 1000mm×1000mm×40mm. The filter cloth is FW1000 polypropylene monofilament filter felt with a pore size of 50μm. The filter press is equipped with hydraulic cylinders at both ends, with a maximum working pressure of 3MPa. It is also equipped with an automatic plate pulling system, which consists of a SRVB-0.75kW servo motor, a screw drive mechanism and a plate pulling trolley.

[0145] (3) Conveyor belt 123: 800 mm wide, made of PVC material, with anti-slip texture on the surface. Driven by a 0.75kW three-phase asynchronous motor, the conveying speed is adjustable.

[0146] The cleaning system 14 consists of the following components:

[0147] (1) High-pressure water pump 141: ISG32-30 vertical multi-stage centrifugal pump, made of stainless steel, with a maximum working pressure of 6 MPa and a flow rate of 0-30 m 3 / h, the motor power is 30kW.

[0148] (2) Rotating nozzle 142: It is installed at the top center of the mixing barrel 111 and is driven by two orthogonal rotating axes. It can rotate 360°. The nozzle is made of YG6X hard alloy and the water outlet pressure is ≥4MPa.

[0149] (3) Cleaning pipeline 143: It uses a DN25 SUS304 stainless steel pipe with a length of 15m and quick connectors at both ends.

[0150] The deodorization system 15 includes the following components:

[0151] (1) Gas collection hood 151: Covering the stirring system and filter pressure device 12, it is made of SUS304 stainless steel plate with a thickness of 2 mm and a hood size of 2.8 m × 2 m × 1.5 m. PVC soft curtains are set around the hood to increase the collection efficiency.

[0152] (2) Induced draft fan 152: Model is DF series, made of carbon steel spraying, impeller diameter 400mm, motor power 15kW, maximum air volume 12000m 3 / h, maximum static pressure 3000Pa.

[0153] (3) Activated carbon adsorption tower 153: It adopts a double-layer inner filling design, with the inner layer being BF-5 coconut shell activated carbon and the outer layer being SUS304 stainless steel grid. The overall size is Φ1200mm×6000mm. The air volume is 10000m 3 / h, removal efficiency ≥90%.

[0154] (4) Exhaust chimney 154: The height is 20m, with a stainless steel rain cover and sampling platform on the top.

[0155] The entire device is integrated into a 6×4 dump truck with a compartment size of 6.5m×2.5m×1.8m. The various components of the device are reasonably arranged to ensure that the weight and size of the equipment can be loaded into the compartment. The chassis of the engineering vehicle adopts the Sinotruk Steyr model with a rated total mass of 32 tons.

[0156] Embodiment 2:

[0157] This embodiment relates to a coastal black and smelly sludge pretreatment device deployed at a seashore sludge collection point. Compared with the embodiment 1, the device is different in some component selection and overall layout.

[0158] The base 10 still uses a rectangular metal frame structure, but the size is changed to 4m×3m×2m, and it is welded with SUS304 stainless steel profiles. The bottom is equipped with 8 height-adjustable support legs, and the soles are rubber sheaths, which can adapt to complex coastal terrain. The entire surface of the base 10 is sprayed with salt spray-resistant fluorocarbon paint.

[0159] In the mixing system, the material of the mixing barrel 111 is upgraded from SUS316L to 2507 super stainless steel to better resist seawater corrosion. The diameter of the mixing shaft 112 is increased to 120mm, using 2205 duplex stainless steel, and the chrome plating process is also increased to 20%.

[0160] The feed pump 121 of the filter press device 12 adopts the 2TL400-51 model, and the maximum flow rate is 160m 3 / h. The plate and frame filter press 122 is composed of 15 PB1200 filter plates, each with a size of 1200mm×1200mm×40mm. The maximum working pressure of the hydraulic cylinders at both ends of the filter press is increased to 4MPa.

[0161] In the deodorization system 15, the size of the air collecting hood 151 is increased to 3.5m×2.5m×2m and is made of SUS316L stainless steel. The induced draft fan 152 is of DF series with a maximum air volume of 18000m 3 / h, maximum static pressure 3500Pa. The diameter of activated carbon adsorption tower 153 is increased to 1.5m, and the height remains unchanged. The height of exhaust pipe 154 is increased to 25m.

[0162] The entire device is placed on a flat site near the beach, with a reinforced concrete foundation and a wind pressure resistance of Beaufort wind level 8. Wind shields are set around the device to reduce the impact of sea breeze on the equipment.

[0163] Embodiment 3:

[0164] This embodiment introduces in detail the intelligent control system of the coastal black and smelly sludge pretreatment device. The system consists of the following components:

[0165] 1. Central control unit: OMRON CP1L-M40DR-APLC, CPU frequency is 20MHz, with 24 input and output ports, and programmable capacity is 8k. PLC communicates with human-machine interface and fieldbus equipment through Ethernet port.

[0166] 2. Human-machine interface: It uses OMRON NB7W-TW01B 7-inch color touch screen with a resolution of 800×480 pixels. It is installed on the front of the control cabinet, and the operator can easily input various process parameters through the touch screen.

[0167] 3. Field Sensors:

[0168] (1) Liquid level sensor: VEGASWING61 model, with a measuring range of 0-2m and an output of 4-20mA, installed inside each mixing barrel 111.

[0169] (2) Pressure sensor: Model: HDA4745-A-400-000, range: 0-4MPa, accuracy: ±0.5%FS, installed on the filtrate pipeline and hydraulic system pipeline.

[0170] (3) Temperature sensor: Use Pt100 model, installed on the wall of the mixing barrel 111 and the filtrate outlet, with a temperature range of 0-100℃.

[0171] 4.Executing agency:

[0172] (1) Electric valve 1142: Z41W-16P electric gate valves are used at the black and smelly sludge inlet 115 and the additive inlet 114, and D71X-16 electric butterfly valves are used on the mixing barrel 111 discharge pipe and the filter press feed pipe.

[0173] (2) Variable frequency motor 1131: M2QA model, power 11kW, speed range 0-1500rpm, IP55 protection grade.

[0174] (3) Feed pump 121: Use S series variable frequency screw pump.

[0175] (4) Filter press hydraulic system: It consists of ATOS valve block, plunger pump and BONANG hydraulic cylinder, with a maximum working pressure of 30MPa.

[0176] (5) Conveyor belt 123 motor: model is Y132M-4, power is 7.5kW.

[0177] The workflow of the control system is as follows:

[0178] (1) System initialization: After power-on, the PLC first performs a self-check to confirm the communication status of each sensor and actuator. If everything is normal, it enters the standby state. Otherwise, an alarm is displayed on the human-machine interface.

[0179] (2) Process parameter setting: The operator inputs parameters such as stirring speed, stirring time, additive dosage, filter pressure, etc. through the touch screen, and the PLC stores these data in the internal memory.

[0180] (3) Startup preparation: The PLC first checks whether the liquid level of each mixing barrel 111 is lower than the safe liquid level, closes all the feed and discharge valves, and starts the induced draft fan 152 of the deodorization system 15. Then, the status of the filter pressure device 12 is checked to ensure that the hydraulic system is normal.

[0181] (4) Feed control: PLC opens the electric valves 1142 of the additive inlet 114 and the black and smelly sludge inlet 115 in sequence according to the preset ratio, and monitors the liquid level sensor in the mixing barrel 111 at the same time. When the liquid level reaches the set value, the feed valve is automatically closed.

[0182] (5) Stirring process control: PLC starts the variable frequency motor 1131, adjusts the speed to meet the stirring requirements at different stages, and starts the timer at the same time. During the stirring process, PLC monitors the motor current, stirring shaft 112 torque and other parameters in real time, and immediately stops and alarms once an abnormality is detected.

[0183] (6) Discharge control: After the mixing is completed, the PLC opens the electric butterfly valve at the bottom of the mixing barrel 111 and the feed pump 121 to transport the material to the filter press, while monitoring the pipeline pressure to prevent blockage.

[0184] (7) Filtration process control: PLC starts the hydraulic system of the filter press and gradually increases the clamping force according to the preset program, while monitoring the filtrate flow and pressure. When the filtrate flow drops to the set value or reaches the maximum filtration pressure time, the filtration ends automatically.

[0185] (8) Unloading control: After the filtration is completed, the PLC starts the automatic plate pulling system to transport the dehydrated soil cake to the designated location.

[0186] (9) Cleaning control: After a batch of processing is completed, the PLC starts the cleaning system 14, turns on the high-pressure pump and the rotating nozzle 142, and flushes the inside of the mixing barrel 111. The cleaning time can be set through the human-machine interface.

[0187] (10) Data recording and uploading: During the whole process, PLC records various process parameters in real time, including stirring time, stirring speed, material temperature, filtrate flow rate, filter press pressure, etc. It is regularly uploaded to the host computer system via Ethernet to provide a basis for subsequent optimization.

[0188] The control system adopts PID closed-loop control algorithm to accurately adjust the actions of each actuator to ensure stable and controllable process. The human-machine interface is equipped with real-time curve trend chart and alarm information display to provide operators with intuitive monitoring means. The entire system meets the requirements of intrinsic safety and explosion-proof to ensure safe and reliable operation.

[0189] Specifically, the principle of the present invention is: first, the device uses highly corrosion-resistant materials, such as 316L stainless steel, polypropylene, etc., to resist corrosion in the high salinity and strong acid and alkaline environment in the sludge. This ensures the service life and operational safety of the device.

[0190] Secondly, the design of the stirring system fully considers the characteristics of sludge. The stirring barrel 111 adopts a vertical structure, which is convenient for the entry, exit and discharge of materials; the multi-layer blades arranged on the stirring shaft 112, including inclined blades, spiral blades and conical blades, can realize the upward and downward pushing and radial stirring of materials, and effectively prevent the materials from settling at the bottom of the barrel. At the same time, the stirring speed can be adjusted by the variable frequency motor 1131 to meet the stirring needs at different stages.

[0191] Third, the device integrates the stirring system with the filter press to form an integrated dehydration device. After being stirred and fully mixed, the material is pumped into the filter press for dehydration. During the filtration process, the pressure can be accurately controlled by the hydraulic system, greatly improving the dehydration efficiency. The addition of the automatic plate pulling system also greatly improves the efficiency of the entire operation.

[0192] Fourth, the device is equipped with a gas collecting hood 151 above the stirring system and the filter press, and is equipped with an induced draft fan 152 and an activated carbon adsorption tower 153, which can effectively capture and degrade the odorous gas generated during the operation of the device to prevent pollution to the surrounding environment. This is set up in response to the special environmental requirements of the black and smelly sludge treatment process in coastal areas.

[0193] Finally, the device is equipped with an intelligent PLC control system, which can realize automatic control and optimization adjustment of key process parameters such as feeding, stirring, dehydration, and cleaning. At the same time, various process data are recorded to provide a basis for subsequent optimization. This greatly reduces the difficulty of manual operation and improves the intelligence level of the device.

[0194] In summary, the present invention targets the characteristics of coastal black and smelly sludge and makes systematic innovations in material selection, process design, environmental protection treatment, intelligent control and other aspects, solving the problem that existing technologies are difficult to effectively deal with such special sludge. It has strong practicality and scalability.

Claims

1. A coastal black and smelly sludge pretreatment device, characterized in that: include: A base (10), a stirring system and a filter pressing device (12); The base (10) is a rectangular metal frame structure, which is welded from high-strength stainless steel profiles. Each of the four corners of the bottom is provided with a support foot with adjustable height. The bottom of the support foot is made of rubber material, which can effectively reduce shock and prevent slipping. The stirring system comprises a plurality of stirrers (11) arranged in parallel, each stirrer (11) comprising a stirring barrel (111), a stirring shaft (112), a driving device (113), an additive inlet (114) and a black and smelly sludge inlet (115); The mixing barrel (111) is in the shape of a vertical cylinder and is made of corrosion-resistant 316L stainless steel. The thickness of the barrel wall is not less than 8 mm. The inside is coated with a polytetrafluoroethylene anti-stick coating. The bottom of the barrel is designed to be conical, which is conducive to the discharge of materials. The outside of the barrel is wrapped with an insulation layer, which is made of a closed-cell foam material and has a thickness of 50 mm. The stirring shaft (112) is vertically arranged at the center of the stirring barrel (111), and is made of high-strength alloy steel. The surface is chrome-plated to enhance corrosion resistance. Multiple layers of stirring blades (116) are evenly distributed along the axial direction of the stirring shaft (112). The stirring blades (116) are detachable and easy to replace and clean. The driving device (113) comprises a variable frequency motor (1131), a reducer (1132) and a coupling (1133); the variable frequency motor (1131) is fixedly connected to the top of the stirring barrel (111) via a flange; the reducer (1132) is installed between the variable frequency motor (1131) and the stirring shaft (112), and is connected to the stirring shaft (112) via the coupling (1133) to achieve power transmission; The additive inlet (114) is arranged at the top of the mixing barrel (111), and comprises a funnel-shaped feed port (1141) and an electric valve (1142), wherein the funnel-shaped feed port (1141) is made of corrosion-resistant polypropylene material, and the electric valve (1142) is a pneumatic butterfly valve for realizing remote control; The black and smelly sludge inlet (115) is arranged on the upper side wall of the mixing barrel (111), and comprises a flange connection port and an electric gate valve, wherein the flange connection port adopts a standard DN150 specification, and the electric gate valve is made of a corrosion-resistant rubber lining material; The filter press device (12) is connected to the outlet of the stirring system, and comprises a feed pump (121), a plate and frame filter press (122) and a conveyor belt (123); The feed pump (121) is a screw pump, which is controlled by frequency conversion speed regulation, the pump body is made of wear-resistant alloy, and the seal is a mechanical seal; The plate-and-frame filter press (122) is composed of a plurality of filter press plates, the filter press plates are made of polypropylene, and the filter cloth is a polypropylene monofilament filter cloth, which has good acid and alkali resistance and filtering effect; The conveyor belt (123) is located below the plate-and-frame filter press (122) and is used to convey the formed pre-treated soil cake. The conveyor belt (123) is made of corrosion-resistant PVC material and has anti-slip textures on its surface. The black and smelly sludge inlet (115) is connected to a preset sludge temporary storage tank through a pipeline.

2. A coastal black and smelly sludge pretreatment device according to claim 1, characterized in that: The stirring blade (116) comprises an upper blade, a middle blade and a lower blade; The upper blades are inclined blades with an inclination angle of 45 degrees, which are used to push the material downward; The middle blades are flat blades, distributed in a spiral shape, and are used for radial stirring; The lower blades are conical blades, which can effectively prevent the material from settling at the bottom of the cylinder; All blades are made of duplex 2205 stainless steel, which has excellent strength and corrosion resistance, and the blade edges are chamfered to reduce turbulence and energy loss; The blades are connected to the stirring shaft (112) by a dovetail groove and fixed by fastening bolts, so as to facilitate disassembly and replacement.

3. A coastal black and smelly sludge pretreatment device according to claim 2, characterized in that: The bottom of the mixing barrel (111) is provided with a discharge port (13), and the discharge port (13) is connected to a pneumatic butterfly valve and a soft connecting pipe; The pneumatic butterfly valve adopts a fully sealed design. The valve body is made of CF8M stainless steel, the valve plate is made of polytetrafluoroethylene, and the sealing ring is made of EPDM material, which has good corrosion resistance and sealing performance. The soft connecting pipe is made of food-grade silicone material, has good flexibility and corrosion resistance, and is connected to the pneumatic butterfly valve and the feed pump (121) at both ends through quick connectors, which is easy to disassemble and clean.

4. A coastal black and smelly sludge pretreatment device according to claim 3, characterized in that: The variable frequency motor (1131) is explosion-proof, with a power range of 5.5-15kW, a speed range of 0-1500rpm, and a protection level of IP55; The reducer (1132) is of planetary gear type, with a reduction ratio adjustable from 5:1 to 10:1, oil bath lubrication, and a sealing grade of IP66; The coupling (1133) is an elastic coupling (1133), which is composed of two half couplings (1133) and an elastic element, and can compensate for axial, radial and angular deviations and reduce vibration and noise.

5. A coastal black and smelly sludge pretreatment device according to claim 4, characterized in that: It also includes a cleaning system (14), wherein the cleaning system (14) includes a high-pressure water pump (141), a rotating nozzle (142) and a cleaning pipeline (143); The high-pressure water pump (141) is a vertical multi-stage centrifugal pump with a maximum working pressure of 6 MPa and an adjustable flow rate; The rotating spray head (142) is installed on the top of the mixing barrel (111), adopts a double-axis design, can rotate 360 ​​degrees, and the nozzle is made of hard alloy material, which is wear-resistant; The cleaning pipeline (143) is made of 304 stainless steel, has a diameter of DN25, and is connected to the high-pressure water pump (141) and the rotating nozzle (142) through a quick connector.

6. A coastal black and smelly sludge pretreatment device according to claim 5, characterized in that: The plate-and-frame filter press (122) further comprises a hydraulic system and an automatic plate pulling system. The hydraulic system consists of a hydraulic pump station, a hydraulic cylinder and a solenoid valve, with a maximum working pressure of 30MPa, which can achieve precise control of the clamping force; The automatic plate pulling system includes a servo motor, a gear rack mechanism and a plate pulling trolley, which can automatically open and close the filter press plate to improve work efficiency.

7. A coastal black and smelly sludge pretreatment device according to claim 6, characterized in that: It also includes a deodorization system (15), wherein the deodorization system (15) includes an air collecting hood (151), an induced draft fan (152), an activated carbon adsorption tower (153), and an exhaust pipe (154); The gas collecting hood (151) is arranged above the stirring system and the filter pressure device (12), and is made of 304 stainless steel. A soft curtain is arranged on the edge to increase the collection efficiency.

8. A coastal black and smelly sludge pretreatment device according to claim 7, characterized in that: The activated carbon adsorption tower (153) adopts a double-layer design and is filled with honeycomb activated carbon, with an adsorption efficiency of ≥90%.

9. A coastal black and smelly sludge pretreatment device according to claim 8, characterized in that: The exhaust chimney (154) has a height of not less than 15 meters and is provided with a rain cover and a sampling platform on the top.

10. A coastal black and smelly sludge pretreatment device according to claim 9, characterized in that: The induced draft fan (152) is an anti-corrosion centrifugal fan with adjustable air volume and a maximum air pressure of 3000Pa.

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