A municipal sewage treatment integrated device for sludge in-situ low-temperature pyrolysis

Abstract

The application provides a municipal sewage treatment integrated device for sludge in-situ low-temperature pyrolysis, and relates to the technical field of sewage treatment. The inside of the sedimentation tank is provided with an inner beam, the plate filter is provided with an interface, the inside of the inner beam is fixedly provided with a speed reducer, the output shaft of the speed reducer is fixedly provided with a stirring main shaft through a shaft coupling, and the stirring main shaft is provided with a scraper blade. The sludge scraping and collecting structure, the swing type pressurizing structure, the reciprocating sludge cutting structure, the follow-up cutting structure and the plate filter discharging structure are integrated, the continuous operation of sewage flocculation and sedimentation, sludge scraping and collecting, pressure conveying, multi-stage crushing and dewatering and discharging can be realized in sequence, the problems of single function, dispersed process, large equipment occupation and complicated transfer process of the traditional sewage treatment equipment are solved, the municipal sewage sludge treatment integrated continuous operation is realized, the process flow is simplified, the equipment occupation area is reduced, and the overall sludge low-temperature pyrolysis treatment efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, and more specifically, it relates to an integrated municipal wastewater treatment device for in-situ low-temperature pyrolysis of sludge. Background Technology

[0002] Low-temperature pyrolysis and wastewater sedimentation tanks are key components of municipal wastewater and sludge treatment systems. Wastewater sedimentation tanks are responsible for the settling, separation, and collection of flocculated sludge in wastewater, while low-temperature pyrolysis reduces the volume and renders the collected sludge harmless. The degree of continuity between the two directly determines the overall efficiency of sludge treatment and the level of equipment integration.

[0003] A search of Chinese patent publication number "CN117695716B" reveals "a sedimentation tank" that can screen activated sludge discharged from a biological system, discharging activated sludge with poor settling performance, while reusing activated sludge with good settling performance. This avoids the reduced efficiency of wastewater treatment caused by the deterioration of the settling performance of activated sludge reused in the biological system.

[0004] Based on the above search and existing technology findings, the aforementioned patent has certain defects: the device only has the function of screening and reusing activated sludge settling performance, and can only complete the initial screening and diversion of sludge. It does not integrate subsequent treatment structures such as sludge scraping and collection, pressurized conveying, crushing and dewatering discharge. In the actual sewage treatment process, the settled sludge still needs to be transferred to independent equipment to complete the scraping, conveying, crushing and dewatering processes. The various treatment links are scattered, the equipment layout occupies a large area, the sludge transfer process is cumbersome, and it is difficult to achieve integrated continuous operation from sewage sedimentation to sludge discharge, thus limiting the overall treatment efficiency. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides an integrated municipal wastewater treatment device for in-situ low-temperature pyrolysis of sludge, thereby resolving these issues.

[0006] An integrated municipal wastewater treatment device for in-situ low-temperature pyrolysis of sludge includes a sedimentation tank, a platform, and a plate filter. The sedimentation tank has an inner beam on its inner side, and the plate filter has interfaces around its perimeter. A geared motor is fixedly installed on the inner side of the inner beam. A stirring main shaft is fixedly installed on the output shaft of the geared motor through a coupling. The stirring main shaft is equipped with scrapers around its perimeter. After the wastewater in the sedimentation tank has completed flocculation and the internal clean water has been removed, the geared motor can drive the stirring main shaft to rotate as a whole. The rotating stirring main shaft drives the scrapers arranged around its perimeter to rotate synchronously, so that the scrapers continuously and comprehensively scrape the sludge attached to the inner side of the sedimentation tank.

[0007] Preferably, the end of the stirring spindle is provided with a swing-type pressurization structure, which includes an amplification shaft. The amplification shaft is fixedly located below the stirring spindle and extends to the bottom of the sedimentation tank. The bottom of the sedimentation tank is provided with a double-column slide rail. The end of the amplification shaft is provided with a flexible coupling. The other end of the flexible coupling is provided with a connecting shaft. A first transmission disc is fixedly installed at the lower end of the connecting shaft. A second transmission disc is located below the first transmission disc. The double-column slide rail and the second transmission disc are slidably installed. A first piston cylinder and a concentrating cylinder are located below the second transmission disc. A first ball joint hinge is eccentrically fixedly installed at the lower end of the first transmission disc. A second ball joint hinge is eccentrically fixedly installed at the upper end of the second transmission disc. A connecting rod is provided between the hinge joints of the first and second ball joints. A bracket is provided between the concentrating cylinder and the platform. A shut-off valve is provided between the first piston cylinder and the concentrating cylinder. A first piston rod is fixedly installed at the lower end of the second transmission disc. The first piston rod and the first piston cylinder are slidably sealed together. The piston cylinder is symmetrically equipped with one-way inlet valves A and a one-way outlet valve at the bottom. The one-way outlet valve of the first piston cylinder faces the shut-off valve. During the rotation of the stirring shaft, the amplification shaft is synchronously driven to rotate. The amplification shaft drives the connecting shaft and the first transmission disk to rotate a full circle through an elastic coupling. The eccentrically mounted first ball joint hinge follows the first transmission disk in an eccentric circular motion and pushes and pulls the second ball joint hinge and the second transmission disk through a connecting rod. The double-column slide rail forms a limiting constraint on the second transmission disk, restricting the second transmission disk from circular rotation and horizontal offset, and allowing it to slide only in the vertical direction. This converts the circular rotation of the first transmission disk into the vertical reciprocating linear motion of the second transmission disk. When the second transmission disk moves back and forth, it drives the first piston rod to slide back and forth sealed inside the first piston cylinder. When the first piston rod moves upward, the first piston cylinder completes the intake of air through the one-way inlet valve A. When the first piston rod moves downward, it compresses the gas inside the first piston cylinder. The compressed gas is transported to the inside of the concentrator cylinder through the bottom one-way outlet valve and the shut-off valve, realizing the continuous intermittent pressurization operation of the concentrator cylinder.

[0008] Preferably, the oscillating pressurization structure is equipped with a sludge-collecting structure, which includes a sludge inlet pipe. Multiple sludge inlet pipes are arranged around the central cylinder. Multiple sludge discharge ports are opened through the inner side of the sedimentation tank. A first sludge conveying pipe is fixedly connected between the sludge discharge ports and the sludge inlet pipes. An electrically controlled valve is provided on the side of the first sludge conveying pipe near the sludge discharge port. While the scraper blades are scraping the sludge inside the sedimentation tank, the electrically controlled valve is opened. The scraped sludge can enter the first sludge conveying pipe through the sludge discharge port inside the sedimentation tank and be smoothly transported and collected into the central cylinder through the sludge inlet pipe. With the pressure gas delivered into the central cylinder by the oscillating pressurization structure, a positive pressure environment can be formed inside the central cylinder, which creates an axial pushing force on the sludge inside, accelerates the sludge conveying and collection speed, and compacts the loose sludge, reduces the sludge porosity, and effectively avoids the pipe blockage problem caused by loose sludge retention.

[0009] Preferably, the sludge extraction structure is equipped with a reciprocating sludge cutting structure, which includes a transmission ring located below the collection cylinder. A sliding column assembly is fixedly installed at the upper end of the transmission ring. The sliding column assembly is slidably and sealed with the collection cylinder, and part of its body is located inside the collection cylinder. Multiple stainless steel cutting discs are fixedly installed on the inner side of the sliding column assembly. The stainless steel cutting discs are slidably installed on the inner wall of the collection cylinder. Multiple U-shaped connecting plates are fixedly installed around the second transmission disc and the transmission ring. During the vertical reciprocating movement of the second transmission disc, the reciprocating power is synchronously transmitted to the transmission ring through the U-shaped connecting plates, causing the transmission ring and the sliding column assembly to slide synchronously vertically and reciprocally along the inner wall of the collection cylinder. This, in turn, causes the stainless steel cutting disc to slide reciprocally inside the collection cylinder, reciprocatingly shearing and crushing the accumulated and clumped sludge inside. At the same time, the continuous air pressure output by the swing-type pressurization structure can push the sludge to flow slowly downward, causing the sludge and the stainless steel cutting disc to have a continuous relative displacement, improving the sludge crushing effect, and assisting in pushing the crushed sludge downward for discharge.

[0010] Preferably, the discharge port at the lower end of the central cylinder is equipped with a follow-up cutting structure, which includes a second mud conveying pipe and a third mud conveying pipe. The second mud conveying pipe is located at the discharge port at the lower end of the central cylinder, and the third mud conveying pipe is located between the second mud conveying pipe and the interface. Multiple second piston cylinders are fixedly installed at the upper end of the platform. Each second piston cylinder is equipped with a one-way air inlet valve B and a one-way air outlet valve A. A second piston rod is slidably and sealed inside the second piston cylinder. The second piston rod is fixedly installed to the bottom of the U-shaped connecting plate. Multiple cutting spindles are rotatably mounted around the third mud conveying pipe via sealed bearings. The cutting spindles are in pairs, and the cutting teeth of each pair of cutting spindles are staggered. Multiple pneumatic motors are fixedly installed at the upper end of the platform. The output shaft of each pneumatic motor is fixedly installed to the rotating shaft inside the cutting spindle via a coupling. The air inlet of the pneumatic motor... An air pipe is installed between the outlet and the one-way air outlet valve A. The sludge that has been crushed once inside the central cylinder can flow through the lower outlet sequentially through the second sludge conveying pipe and the third sludge conveying pipe, and then be conveyed to the plate filter through the interface. While the second transmission disc reciprocates, it drives the second piston rod to slide back and forth inside the second piston cylinder through the U-shaped connecting plate. When the second piston rod moves upward, the second piston cylinder expands the negative pressure and draws in air through the one-way air inlet valve B. When the second piston rod moves downward, it compresses the internal gas. The gas is conveyed to the pneumatic motor through the one-way air outlet valve A and the air pipe, which drives the pneumatic motor to drive the cutting spindle to rotate in the opposite direction. The paired staggered cutting teeth perform secondary shearing and refining on the flowing sludge. The intermittent air supply mode enables the cutting spindle to rotate intermittently in sync, completing the follow-up fine cutting during the sludge conveying process. The refined sludge is finally sent to the plate filter for dewatering, and can then be conveyed to the low-temperature pyrolysis furnace for further processing.

[0011] Compared with the prior art, the present invention has the following beneficial effects: In this invention, by starting a reduction motor to drive the stirring main shaft and the amplification shaft to rotate synchronously, the first transmission disc continuously performs eccentric circular motion. Combined with the hinged transmission of the first ball joint, connecting rod, and second ball joint, as well as the limiting and guiding effect of the double-column slide rail on the second transmission disc, the circular rotational motion is converted into the vertical reciprocating linear motion of the second transmission disc and the first piston rod. This allows the first piston cylinder to draw in air through the one-way air inlet valve A, compress gas, and intermittently deliver pressurized gas into the central cylinder through the shut-off valve. This allows for automatic pressurization of the central cylinder without the need for additional pressurization equipment, relying on the existing sludge scraping power. This effectively solves the problems of traditional sludge conveying relying on gravity discharge, slow conveying speed, and sludge accumulation, thus significantly improving sludge conveying efficiency and ensuring continuous and stable sludge discharge.

[0012] In this invention, an electrically controlled valve is installed on the first sludge conveying pipe. When the scraper blades complete the scraping operation on the sludge inside the sedimentation tank, the electrically controlled valve is opened, so that the sludge scraped from the sedimentation tank can be automatically collected and transported to the inside of the collection cylinder through the sludge discharge port, the first sludge conveying pipe, and the sludge inlet pipe. This enables controllable electric sludge collection and transportation, effectively solving the problems of cumbersome traditional manual sludge collection operations, uncontrollable sludge collection volume, and easy sludge leakage and spillage. This achieves automated and precise sludge collection operations, improving the cleanliness and controllability of sludge collection.

[0013] In this invention, the vertical reciprocating motion of the second transmission disc, relying on the U-shaped connecting plate, drives the transmission ring, sliding column assembly, and stainless steel cutting disc to reciprocate synchronously. This reciprocating shearing and crushing of the flocculated, loose sludge inside the central cylinder is achieved through the reciprocating motion of the second transmission disc. Simultaneously, the pressure gas input into the central cylinder by the oscillating pressurization structure propels the sludge to flow continuously, enhancing the relative crushing effect between the sludge and the cutting structure. This effectively breaks down and refines large clumps of sludge, solving the problems of easy clumping, large pores, and loose texture of flocculated sludge, which makes subsequent dewatering and extrusion in plate filter presses difficult and incomplete. This refines the sludge particle size, compacts the sludge structure, significantly reduces the operational difficulty of subsequent sludge dewatering processes, and improves the sludge dewatering effect.

[0014] In this invention, the reciprocating motion of the second transmission disc drives the second piston rod to reciprocate and slide within the second piston cylinder in a sealed manner. This allows the second piston cylinder to draw in air through the one-way air inlet valve B, pressurize it, and then intermittently supply air to the pneumatic motor via the air pipe. The pneumatic motor drives the paired, staggered cutting spindles to rotate intermittently, performing secondary fine cutting on the primary crushed sludge flowing through the third sludge conveying pipe. This further refines the sludge morphology, ensures uniform sludge texture, and provides qualified materials for the subsequent low-temperature pyrolysis process.

[0015] In this invention, by integrating the sludge scraping and extraction structure of the sedimentation tank, the oscillating pressurization structure, the reciprocating sludge cutting structure, the follow-up cutting structure, and the plate filter discharge structure into one unit, continuous operation of sewage flocculation and sedimentation, sludge scraping and collection, pressurized conveying, multi-stage crushing, and dewatering discharge can be realized in sequence. This effectively solves the problems of traditional sewage treatment equipment having single functions, scattered processes, large equipment footprint, and cumbersome transfer processes, thereby realizing integrated continuous operation of municipal sewage and sludge treatment, simplifying the process flow, reducing the equipment footprint, and improving the overall treatment efficiency of sludge low-temperature pyrolysis.

[0016] In this invention, a multi-section power transmission structure combining an expanded shaft, flexible coupling, connecting shaft, eccentric hinge, and connecting rod is employed. This, combined with the limiting constraints of a double-column slide rail and the sealing cooperation of each piston and sliding structure, enables the stable multi-stage transmission of power from the geared motor. The various transmission structures cooperate effectively, with precise limiting and small transmission gaps. This effectively avoids problems such as transmission offset, jamming, loosening, and high power loss that easily occur during multi-section power transmission. Therefore, under multi-stage power transmission conditions, the stability and continuity of the overall transmission operation of the device are always guaranteed, reducing the probability of equipment failure and extending the equipment's service life. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the three-dimensional combined structure of the present invention; Figure 3 This is a schematic diagram of the first piston cylinder assembly structure of the present invention; Figure 4 This is a schematic diagram of the first transmission disc assembly structure of the present invention; Figure 5 This is a schematic diagram of the centralized cylinder assembly structure of the present invention; Figure 6 This is a sectional view of the central tube of the present invention; Figure 7 This is a schematic diagram of the follow-up mud-cutting structure of the present invention; Figure 8 This is a schematic diagram of the follow-up mud-cutting structure assembly of the present invention.

[0018] In the diagram, the correspondence between component names and attached drawing numbers is as follows: 11. Sedimentation tank; 12. Inner beam; 13. Platform; 14. Plate filter; 15. Interface; 16. Gear motor; 17. Agitator shaft; 18. Scraper; 19. Amplification shaft; 21. Double-column slide rail; 22. Flexible coupling; 23. Connecting shaft; 24. First transmission disc; 25. Second transmission disc; 26. First ball joint hinge; 27. Second ball joint hinge; 28. Connecting rod; 29. ​​First piston cylinder; 31. Concentrating cylinder; 3 2. Shut-off valve; 33. First piston rod; 34. One-way air inlet valve A; 35. Sludge inlet pipe; 36. First sludge conveying pipe; 37. Electrically controlled valve; 38. Transmission ring; 39. Sliding column assembly; 41. Stainless steel cutting disc; 42. U-shaped connecting plate; 43. Second sludge conveying pipe; 44. Third sludge conveying pipe; 45. Second piston cylinder; 46. One-way air inlet valve B; 47. One-way air outlet valve A; 48. Second piston rod; 49. Cutting spindle; 51. Pneumatic motor; 52. Air pipe; 53. Support. Detailed Implementation

[0019] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0020] Please see Figure 1 - Figure 8 This invention provides an integrated municipal wastewater treatment device for in-situ low-temperature pyrolysis of sludge, comprising a sedimentation tank 11, a platform 13, and a plate filter 14. The sedimentation tank 11 is cast in reinforced concrete, with its inner wall coated with an epoxy coal tar anti-corrosion coating, suitable for wastewater immersion and contact with corrosive sludge. The platform 13 is a welded platform made of Q235B steel, with a hot-dip galvanized surface for corrosion protection, suitable for humid and dusty operating environments. The inner beams 12 are made of 304 stainless steel I-beams, with overall passivation and corrosion protection treatment. The inner beams 12 are located inside the sedimentation tank 11, and the plate filter 14 has interfaces 15 around its perimeter. A geared motor 16 is fixedly installed on the inner side of the inner beam 12. A stirring main shaft 17 is fixedly installed on the output shaft of the geared motor 16 through a coupling. The stirring main shaft 17 is equipped with scraper blades 18 around its body. The scraper blades 18 can scrape the sludge inside the sedimentation tank 11. The geared motor 16 is an IP68 protection-rated corrosion-resistant geared motor, which is suitable for underwater high humidity and corrosive media conditions. The stirring main shaft 17 is a solid 316L stainless steel shaft, and the entire shaft body is polished and passivated. The scraper blades 18 are made of 316L stainless steel plate bent and formed, with the cutting edge machined. The scraper blades 18 can scrape the sludge inside the sedimentation tank 11.

[0021] The end of the stirring shaft 17 is equipped with a swing-type pressurization structure, which includes an amplification shaft 19. The amplification shaft 19 is a 316L stainless steel drive shaft with a passivated anti-corrosion treatment. The amplification shaft 19 is fixed below the stirring shaft 17 and extends to the bottom of the sedimentation tank 11. The bottom of the sedimentation tank 11 is equipped with a double-column slide rail 21, which is made of 45# steel with a hard chrome plated surface. The end of the amplification shaft 19 is equipped with a flexible coupling 22, which is made of 304 stainless steel with a polyurethane elastic pad, suitable for torsion in humid and corrosive environments. The torque-compensated transmission uses a flexible coupling 22 with a connecting shaft 23 at one end. The connecting shaft 23 is made of 316L stainless steel round bar. A first transmission disc 24 is fixedly installed at the lower end of the connecting shaft 23. Below the first transmission disc 24 is a second transmission disc 25. The double-column slide rail 21 and the second transmission disc 25 are slidably installed. The first transmission disc 24 and the second transmission disc 25 are both made of 304 stainless steel casting. Below the second transmission disc 25 are a first piston cylinder 29 and a concentrator cylinder 31. The first piston cylinder 29 is a seamless 316L stainless steel cylinder. The inner wall of the cylinder is honed. The central cylinder 31 is a 316L stainless steel rolled and welded cylinder with a polished inner wall. A first ball joint hinge 26 is eccentrically fixed at the lower end of the first transmission disc 24, and a second ball joint hinge 27 is eccentrically fixed at the upper end of the second transmission disc 25. Both the first ball joint hinge 26 and the second ball joint hinge 27 are made of 316L stainless steel and have a sealed dustproof structure. A connecting rod 28 is provided between the hinge joints of the first ball joint hinge 26 and the second ball joint hinge 27. The connecting rod 28 is a 316L stainless steel round rod. A connection is provided between the central cylinder 31 and the platform 13. The bracket 53 is a welded part of Q235B steel, and is hot-dip galvanized for corrosion protection. A shut-off valve 32 is provided between the first piston cylinder 29 and the central cylinder 31. The shut-off valve 32 is a 316L stainless steel corrosion-resistant pneumatic shut-off valve 32. The first piston rod 33 is fixedly installed at the lower end of the second transmission disc 25. The first piston rod 33 is slidably installed with the first piston cylinder 29. One-way air inlet valves A34 are symmetrically provided around the first piston cylinder 29. One-way air outlet valve is provided at the bottom of the first piston cylinder 29. The one-way air outlet valve of the first piston cylinder 29 faces the shut-off valve 32.

[0022] By starting the geared motor 16, the stirring shaft 17 and the amplification shaft 19 rotate synchronously, causing the first transmission disc 24 to continuously perform eccentric circular motion. In conjunction with the hinged transmission of the first ball joint 26, connecting rod 28, and second ball joint 27, as well as the limiting and guiding effect of the double column slide rail 21 on the second transmission disc 25, the circular rotational motion is converted into the vertical reciprocating linear motion of the second transmission disc 25 and the first piston rod 33. This allows the first piston cylinder 29 to draw in air through the one-way air inlet valve A34, compress gas, and intermittently deliver pressurized gas into the central cylinder 31 through the shut-off valve 32. Automatic pressurization of the central cylinder 31 can be achieved without the need for additional pressurization power equipment, relying on the original sludge scraping power. This effectively solves the problems of traditional sludge conveying relying on gravity discharge, slow conveying speed, and sludge accumulation and retention, thereby significantly improving sludge conveying efficiency and ensuring continuous and stable sludge discharge.

[0023] The swing-type pressurization structure is equipped with a sludge extraction structure, which includes a sludge inlet pipe 35 and a 316L stainless steel wear-resistant bushing at the sludge discharge port. The sludge inlet pipe 35 is a seamless 316L stainless steel pipe. Multiple sludge inlet pipes 35 are arranged around the central cylinder 31. Multiple sludge discharge ports are opened through the inner side of the sedimentation tank 11. A first sludge conveying pipe 36 is fixedly connected between the sludge discharge ports and the sludge inlet pipes 35. An electrically controlled valve 37 is provided on the side of the first sludge conveying pipe 36 near the sludge discharge port. The electrically controlled valve 37 is an IP67 protection-rated 316L stainless steel corrosion-resistant electric butterfly valve, which is suitable for corrosive sewage sludge conditions.

[0024] By installing an electrically controlled valve 37 on the first sludge conveying pipe 36, the valve 37 is opened when the scraper blade 18 completes the scraping operation on the sludge inside the sedimentation tank 11. This allows the sludge scraped from the sedimentation tank 11 to be automatically collected and transported to the central cylinder 31 through the sludge discharge port, the first sludge conveying pipe 36, and the sludge inlet pipe 35. This enables controllable electric sludge removal and conveying, effectively solving the problems of cumbersome traditional manual sludge removal operations, uncontrollable sludge removal volume, and easy sludge leakage and spillage. This achieves automated and precise sludge removal operations, improving the cleanliness and controllability of sludge collection.

[0025] The mud-collecting structure is equipped with a reciprocating mud-cutting structure, which includes a transmission ring 38 located below the concentrator 31. A sliding column assembly 39 is fixedly installed at the upper end of the transmission ring 38. The sliding column assembly 39 is made of 45# steel with hard chrome plating. The sliding column assembly 39 is slidably installed in a sealed manner with the concentrator 31, and part of its body is located inside the concentrator 31. Multiple stainless steel cutting discs 41 are fixedly installed inside the sliding column assembly 39. The stainless steel cutting discs 41 are made of 316L stainless steel plates with hardened cutting edges. The stainless steel cutting discs 41 are slidably installed on the inner wall of the concentrator 31. Multiple U-shaped connecting plates 42 are fixedly installed around the second transmission disc 25 and the transmission ring 38. The U-shaped connecting plates 42 are made of 304 stainless steel bent and welded plates.

[0026] The vertical reciprocating motion of the second transmission disc 25, relying on the U-shaped connecting plate 42, drives the transmission ring 38, the sliding column group 39, and the stainless steel cutting disc 41 to slide back and forth synchronously. This reciprocating shearing and crushing of the flocculated and loose sludge inside the central cylinder 31 is achieved through the reciprocating shearing and crushing. At the same time, the pressure gas input into the central cylinder 31 by the swing-type pressurization structure pushes the sludge to flow continuously, enhancing the relative crushing effect between the sludge and the cutting structure. This can fully disperse and refine large clumps of sludge, effectively solving the problems of easy clumping, large pores, and loose texture of flocculated sludge, which makes subsequent dewatering and extrusion by the plate filter 14 difficult and incomplete. This refines the sludge particle size, compacts the sludge structure, significantly reduces the operational difficulty of subsequent sludge dewatering processes, and improves the sludge dewatering effect.

[0027] The discharge port at the lower end of the concentrator 31 is equipped with a follow-up cutting structure, which includes a second mud conveying pipe 43 and a third mud conveying pipe 44. The second mud conveying pipe 43 is located at the discharge port at the lower end of the concentrator 31. Both the second mud conveying pipe 43 and the third mud conveying pipe 44 are 316L stainless steel seamless pipes. The third mud conveying pipe 44 is located between the second mud conveying pipe 43 and the interface 15. Multiple second piston cylinders 45 are fixedly installed on the upper end of the platform 13. The second piston cylinders 45 are 316L stainless steel seamless cylinders with honed inner walls. One-way air inlet valves B46 and one-way air outlet valves A47 are respectively provided around the second piston cylinder 45. A second piston rod 48 is slidably installed inside the second piston cylinder 45. The stopper rod 48 is fixedly installed at the bottom of the U-shaped connecting plate 42. Multiple cutting spindles 49 are rotatably installed around the third mud conveying pipe 44 through sealed bearings. The cutting spindles 49 are 316L stainless steel drive shafts. There are two cutting spindles 49 in a pair, and the cutting teeth of each pair of cutting spindles 49 are staggered. Multiple pneumatic motors 51 are fixedly installed at the upper end of the platform 13. The pneumatic motors 51 are IP65 protection level corrosion-resistant pneumatic motors 51, which are suitable for dusty, humid and corrosive working conditions. The output shaft of each pneumatic motor 51 is fixedly installed with the rotating shaft inside the cutting spindle 49 through a coupling. An air pipe 52 is provided between the air inlet of the pneumatic motor 51 and the one-way air outlet valve A47. The air pipe 52 is a corrosion-resistant PU steel wire hose.

[0028] The reciprocating motion of the second transmission disc 25 drives the second piston rod 48 to reciprocate and slide within the second piston cylinder 45, achieving the second piston cylinder 45 to draw in air through the one-way air inlet valve B46, pressurize it, and then intermittently supply air to the pneumatic motor 51 through the air pipe 52. This drives the pneumatic motor 51 to intermittently rotate the paired staggered cutting spindles 49, performing secondary fine cutting on the primary crushed sludge flowing through the third sludge conveying pipe 44, thereby further refining the sludge morphology, ensuring uniform sludge texture, and providing qualified materials for the subsequent low-temperature pyrolysis process.

[0029] Working principle: After the wastewater in sedimentation tank 11 has completed flocculation, the clear water inside sedimentation tank 11 is extracted, and then the reduction motor 16 is started. The reduction motor 16 drives the stirring main shaft 17 to rotate through the output shaft. The stirring main shaft 17 drives the scraper blades 18 around it to rotate synchronously. During the rotation of the scraper blades 18, the sludge attached to the inside of sedimentation tank 11 is scraped off. At the same time, the rotation of the stirring main shaft 17 drives the amplification shaft 19 at the end to rotate synchronously. The amplification shaft 19 drives the connecting shaft 23 and the first transmission disk 24 to rotate synchronously through the elastic coupling 22 at the end. During the full rotation of the first transmission disk 24, the first ball joint hinge 26 is eccentrically fixed to the lower end face of the first transmission disk 24, so that the first ball joint hinge 26 follows the first transmission disk 24 in eccentric circular motion. The first ball joint hinge 26 is hinged to and pulls the second ball joint hinge 27 through the connecting rod 28. The second ball joint hinge 27 is fixed to the upper end face of the second transmission disk 25. The second transmission disk 25 is integrally... With the sliding cooperation of the double-column slide rail 21, the double-column slide rail 21 restricts the second transmission disk 25 from rotating in a circle and from shifting horizontally, and can only slide in a vertical direction. When the first transmission disk 24 rotates eccentrically, the push-pull transmission action of the connecting rod 28, combined with the one-way limiting constraint of the double-column slide rail 21, converts the circular rotation motion of the first transmission disk 24 into the vertical up-and-down reciprocating linear motion of the second transmission disk 25. When the second transmission disk 25 moves back and forth, it drives the first piston rod 33 at the lower end to slide back and forth in a sealed manner inside the first piston cylinder 29. During the upward movement of the first piston rod 33, the first piston cylinder 29 completes the air intake operation through the one-way air intake valve A34 around its body. During the downward movement of the first piston rod 33, the gas inside the first piston cylinder 29 is pressurized and then transported to the inside of the concentrator 31 through the bottom one-way air outlet valve and the shut-off valve 32, thereby realizing the continuous intermittent pressurization of the concentrator 31 by the swing pressurization structure.

[0030] While the scraper blade 18 is scraping sludge, the electrically controlled valve 37 on the first sludge conveying pipe 36 is opened. The sludge scraped from the inside of the sedimentation tank 11 enters the first sludge conveying pipe 36 through the sludge discharge port, and is then transported to the inside of the collection cylinder 31 through the sludge inlet pipe 35. The oscillating pressurization structure intermittently delivers pressurized gas into the collection cylinder 31. The pressurized gas creates a positive pressure environment inside the collection cylinder 31. The positive pressure acts on the surface of the sludge entering the collection cylinder 31, creating an axial pushing force on the sludge, accelerating the sludge collection and downward conveying speed, while compacting the loose sludge, reducing sludge pores, and preventing the sludge from becoming loose and stagnant, causing pipe blockage.

[0031] During the vertical reciprocating movement of the second transmission disc 25, synchronous reciprocating power is transmitted to the transmission ring 38 through the fixedly connected U-shaped connecting plate 42. The transmission ring 38 follows the second transmission disc 25 to perform synchronous vertical reciprocating motion, thereby driving the upper sliding column assembly 39 to perform sealed reciprocating sliding along the inner wall of the central cylinder 31. When the sliding column assembly 39 moves, it drives multiple stainless steel cutting discs 41 fixed on the inner side to move up and down synchronously. During the sliding process inside the central cylinder 31, the stainless steel cutting discs 41 reciprocate to shear and crush the accumulated and clumped sludge. The continuous air pressure input by the swing-type pressurization structure pushes the sludge inside the central cylinder 31 to flow slowly downward, so that the sludge continuously moves relative to the reciprocating stainless steel cutting discs 41, thereby crushing the sludge. At the same time, the pressurized airflow assists in pushing the crushed sludge to continuously discharge downward.

[0032] The crushed sludge inside the central cylinder 31 enters the second sludge conveying pipe 43 and the third sludge conveying pipe 44 sequentially through the lower discharge port, and is finally conveyed to the plate filter 14 through the interface 15. Simultaneously, the second transmission disc 25 reciprocates, driving the second piston rod 48 to slide reciprocally and sealably inside the second piston cylinder 45 via the U-shaped connecting plate 42. When the second piston rod 48 moves upward, the internal cavity of the second piston cylinder 45 expands, creating a negative pressure. The second piston cylinder 45 completes the air intake operation through the one-way air inlet valve B46. When the second piston rod 48 moves downward, the internal cavity of the second piston cylinder 45 contracts, compressing the gas. The gas then passes through the one-way air inlet valve B46. The air is supplied to the pneumatic motor 51 via the air pipe 52 through the air outlet valve A47. After receiving the air pressure, the pneumatic motor 51 starts and drives the corresponding cutting spindle 49 to rotate (the rotation direction must be opposite to the conveying direction). During the rotation of the paired cutting spindles 49 with interlaced cutting teeth, the sludge flowing through the third sludge conveying pipe 44 is subjected to secondary shearing and refinement. The reciprocating motion of the second piston rod 48 forms a periodic intermittent air supply, which makes the cutting spindle 49 rotate intermittently following the pressurized cutting process, completing the synchronous follow-up cutting operation in the sludge conveying process. Finally, it is conveyed into the plate filter 14 for dewatering, and then sent into the low-temperature pyrolysis furnace.

[0033] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. An integrated municipal wastewater treatment device for in-situ low-temperature pyrolysis of sludge, comprising a sedimentation tank (11), a platform (13), and a plate filter (14), wherein an inner beam (12) is provided on the inner side of the sedimentation tank (11), and the plate filter (14) is provided with interfaces (15) for connecting to downstream treatment equipment. A geared motor (16) is fixedly installed on the inner side of the inner beam (12), and a stirring main shaft (17) is fixedly mounted on the output shaft of the geared motor (16). Scraper blades (18) are fixedly arranged around the stirring main shaft (17), characterized in that: The end of the stirring main shaft (17) is equipped with a swing-type pressurization structure that operates synchronously with the stirring main shaft (17). The swing-type pressurization structure includes an amplification shaft (19). The amplification shaft (19) is fixedly connected to the lower end of the stirring main shaft (17) and extends vertically downward through the outside of the bottom of the sedimentation tank (11). The bottom of the sedimentation tank (11) is fixedly equipped with a double-column slide rail (21). The end of the amplification shaft (19) is connected to a connecting shaft (23) through an elastic coupling (22). The lower end of the connecting shaft (23) is fixedly equipped with a first transmission disc (24). A second transmission disc (25) that can make vertical reciprocating sliding motion is correspondingly arranged below the first transmission disc (24). A first piston cylinder (29) for air pressure pressurization and a collection cylinder (31) for sludge collection and transfer are correspondingly arranged below the second transmission disc (25). The swing-type pressurization structure is equipped with an adaptive sludge extraction structure. The sludge extraction structure includes several sets of sludge inlet pipes (35) arranged around the central cylinder (31). Several sets of evenly distributed sludge discharge ports are opened through the inner wall of the sedimentation tank (11). A first sludge conveying pipe (36) is fixedly connected between the sludge discharge port and the corresponding sludge inlet pipe (35). An electrically controlled valve (37) for controlling the on / off state and adjusting the sludge extraction flow rate is installed on the pipe section of the first sludge conveying pipe (36) near the sludge discharge port.

2. The integrated municipal wastewater treatment device for in-situ low-temperature pyrolysis of sludge as described in claim 1, characterized in that, The double-column slide rail (21) is limited and slidably engaged with the second transmission disk (25). The double-column slide rail (21) is used to limit the horizontal offset and circumferential rotation of the second transmission disk (25) and retain only the vertical sliding degree of freedom. The first transmission disk (24) is eccentrically fixedly mounted with a first ball joint hinge (26) on its lower end face, and the second transmission disk (25) is eccentrically fixedly mounted with a second ball joint hinge (27) on its upper end face. A connecting rod (28) that can adaptively deflect angle is hinged between the hinge ends of the first ball joint hinge (26) and the second ball joint hinge (27). The first transmission disk (24), the first ball joint hinge (26), the connecting rod (28), and the second ball joint hinge (27) cooperate to form an eccentric connecting rod transmission mechanism, which is used to convert the circumferential rotation of the first transmission disk (24) into the vertical reciprocating linear motion of the second transmission disk (25).

3. The integrated municipal wastewater treatment device for in-situ low-temperature pyrolysis of sludge as described in claim 2, characterized in that, A bracket (53) for overall support and fixation is fixed between the central cylinder (31) and the platform (13). A shut-off valve (32) for controlling the opening and closing of the air passage is installed between the connecting pipe of the first piston cylinder (29) and the central cylinder (31). A first piston rod (33) that can move synchronously with the second transmission disc (25) is vertically fixed at the center of the lower end of the second transmission disc (25).

4. The integrated municipal wastewater treatment device for in-situ low-temperature pyrolysis of sludge as described in claim 3, characterized in that, The upper end of the first piston rod (33) is fixed to the second transmission disc (25), and the lower end is sealed and slidably assembled with the inner cavity of the first piston cylinder (29). Several sets of one-way air intake valves A (34) for one-way air intake and pressure replenishment are symmetrically arranged around the body of the first piston cylinder (29).

5. The integrated municipal wastewater treatment device for in-situ low-temperature pyrolysis of sludge as described in claim 4, characterized in that, The bottom of the first piston cylinder (29) is provided with a one-way exhaust valve for one-way exhaust and pressurization. The exhaust port of the one-way exhaust valve is set directly opposite the air inlet of the shut-off valve (32), so that the pressure gas compressed by the first piston cylinder (29) can be delivered to the inside of the central cylinder (31) in one direction, thereby realizing intermittent positive pressure pressurization inside the central cylinder (31).

6. The integrated municipal wastewater treatment device for in-situ low-temperature pyrolysis of sludge as described in any one of claims 1-5, characterized in that, The lower end of the mud-taking structure is equipped with a reciprocating mud-cutting structure that can be linked with the pressurization structure. The reciprocating mud-cutting structure includes a transmission ring (38), which is coaxially arranged at the bottom end of the concentrator (31). The upper end face of the transmission ring (38) is fixedly connected to a vertically arranged sliding column assembly (39). The upper end of the sliding column assembly (39) is sealed and slidably assembled with the inner cavity of the concentrator (31), and the upper part of the structure extends into the interior of the concentrator (31).

7. The integrated municipal wastewater treatment device for in-situ low-temperature pyrolysis of sludge as described in claim 6, characterized in that, Several sets of arrayed stainless steel cutting discs (41) are fixedly installed on the inner side of the end of the sliding column assembly (39) that extends into the concentrator (31). The outer edge of the stainless steel cutting disc (41) slides against the inner wall of the concentrator (31) and is used to reciprocate to shear and break the clumps of sludge inside the concentrator (31). Several sets of evenly arranged U-shaped connecting plates (42) are fixedly connected between the outer periphery of the second transmission disc (25) and the outer periphery of the transmission ring (38). The second transmission disc (25) transmits reciprocating power to the transmission ring (38) synchronously through the U-shaped connecting plates (42) to realize the linkage and synchronization of the cutting action and the pressurizing action.

8. The integrated municipal wastewater treatment device for in-situ low-temperature pyrolysis of sludge as described in claim 1, characterized in that, The lower end of the central cylinder (31) is equipped with a follow-up mud cutting structure. The follow-up mud cutting structure includes a second mud conveying pipe (43) and a third mud conveying pipe (44) connected in sequence. The top end of the second mud conveying pipe (43) is fixed to the lower end of the central cylinder (31). The end of the third mud conveying pipe (44) is connected to an interface (15). Several sets of arrayed second piston cylinders (45) are fixedly arranged on the upper surface of the platform (13).

9. The integrated municipal wastewater treatment device for in-situ low-temperature pyrolysis of sludge as described in claim 8, characterized in that, The second piston cylinder (45) is respectively equipped with a one-way air inlet valve B (46) and a one-way air outlet valve A (47). The one-way air inlet valve B (46) and the one-way air outlet valve A (47) respectively realize the one-way air inlet and one-way air outlet of the second piston cylinder (45). The second piston cylinder (45) is sealed and slidably equipped with a second piston rod (48). The bottom end of the second piston rod (48) is fixedly connected to the bottom of the U-shaped connecting plate (42) and can slide back and forth synchronously with the U-shaped connecting plate (42). The third sludge conveying pipe (44) is rotatably equipped with several sets of cutting spindles (49) that can perform secondary cutting of the conveyed sludge through a sealed bearing.

10. The integrated municipal wastewater treatment device for in-situ low-temperature pyrolysis of sludge as described in claim 9, characterized in that, The cutting spindles (49) are arranged in pairs, and the cutting teeth of each pair of cutting spindles (49) are staggered and corresponding. The upper end of the platform (13) is fixedly installed with a pneumatic motor (51) corresponding to the cutting spindle (49). The output shaft of the pneumatic motor (51) is fixedly connected to the rotating shaft of the corresponding cutting spindle (49) through a coupling. The air inlet port of the pneumatic motor (51) and the air outlet port of the one-way air outlet valve A (47) are connected by an air pipe (52). The pressure gas compressed by the second piston cylinder (45) can provide intermittent power air source for the pneumatic motor (51) through the air pipe (52), so as to realize the intermittent follow-up cutting of the cutting spindle (49) with the sludge conveying process.

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