Multistage forced circulation heat exchange type sludge wet oxidation treatment system

Abstract

The invention discloses a multi-stage forced circulation heat exchange type sludge wet oxidation treatment system. The treatment system comprises a dehydration unit, a plurality of groups of heat exchangers, a catalyst activator and a wet oxidizer, the catalyst activator is located on the outer side of the dehydration unit, the wet oxidizer is located on the outer side of the catalyst activator, and the multiple sets of heat exchangers are all located among the dehydration unit, the catalyst activator and the wet oxidizer. Sludge in the catalyst activator and the wet oxidizer can be effectively stirred, it is ensured that the sludge is fully mixed with a catalyst, an oxidizing agent and the like, the reaction efficiency is improved, the inner wall of the container can be cleaned while stirring is conducted through the design of the scraper, and the situation that the equipment performance is reduced due to long-time sludge attachment is prevented; due to the design of the conveying auger, the sludge can be fully dehydrated in the extrusion process, the dehydration efficiency is improved, and the device can also be used for carrying out steam humidification treatment on the sludge.

Description

Technical Field

[0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a multi-stage forced circulation heat exchange type sludge wet oxidation treatment system. Background Art

[0002] Sludge, a byproduct of wastewater treatment, refers to the solid fraction retained or separated during the treatment of domestic or industrial wastewater. Sludge is a non-Newtonian fluid with shear-thinning and thixotropic properties. At high shear rates, its flow behavior is similar to that of a thixotropic colloid, while at low shear rates, it exhibits solid and viscoelastic properties. Thermal hydrolysis of sludge can significantly reduce sludge viscosity and weaken its solid-phase properties, resulting in a weakening of the non-Newtonian fluid behavior of thermally hydrolyzed sludge.

[0003] It can be seen that thermal hydrolysis technology can realize the industrial treatment of sludge. The high-temperature thermal hydrolysis process of sludge organic matter first involves the dispersion and disintegration of microbial flocs. The organic matter (protein, fat, carbohydrate) in the cells is released and continuously dissolved, and the soluble organic matter is continuously hydrolyzed. At lower temperatures, the microbial flocs only partially disintegrate; at higher temperatures, not only will the microbial flocs disintegrate, but the soluble organic matter will also be further hydrolyzed. In order to enhance the effect of thermal hydrolysis, relevant production and research units in the industry have developed wet oxidation sludge treatment technology, which optimizes the ordinary water pyrolysis process and can realize the conversion of large-molecule organic matter in sludge into small-molecule organic matter or inorganic substances such as water and carbon dioxide;

[0004] A search revealed that publication number CN106865938A discloses a catalytic wet oxidation treatment technology for sludge. After dehydrating the sludge to approximately 80%, the sludge is mixed and heated with steam at 130-150°C to dilute it to a moisture content of approximately 86%. The sludge then enters a catalyst activator, where an oxidant and catalyst are added for reaction, before entering a wet oxidizer for wet oxidation. The oxidized sludge enters a heat exchanger to reduce its temperature to below 80°C, where it is finally dehydrated. The liquid generated by the heat exchanger and separation process has a temperature of 70-80°C and is refluxed for mixing with the sludge and steam.

[0005] In the above scheme, when the sludge is subjected to catalytic reaction and wet oxidation reaction, the sludge is introduced into the interior of a designated container for treatment. The sludge will adhere to the inner wall of the container. After long-term operation, more sludge will adhere to the inner wall, which will affect the treatment of the sludge and needs to be improved. Therefore, it is particularly important to design a multi-stage forced circulation heat exchange sludge wet oxidation treatment system to solve the above-mentioned defects. Summary of the Invention

[0006] (1) Technical problems to be solved

[0007] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a multi-stage forced circulation heat exchange sludge wet oxidation treatment system. This treatment system solves the problem that under the existing technology, when the sludge is subjected to catalytic reaction and wet oxidation reaction, the sludge is introduced into the interior of a designated container for treatment, and the sludge will adhere to the inner wall of the container. After long-term operation, more sludge will adhere to the inner wall, which will affect the treatment of the sludge.

[0008] (2) Technical solution

[0009] In order to solve the above technical problems, the present invention provides a multi-stage forced circulation heat exchange type sludge wet oxidation treatment system, which includes a dehydration unit, multiple sets of heat exchangers, a catalyst activator and a wet oxidizer; the catalyst activator is located outside the dehydration unit, the wet oxidizer is located outside the catalyst activator, and the multiple sets of heat exchangers are located between the dehydration unit, the catalyst activator and the wet oxidizer;

[0010] The catalyst activator and the wet oxidizer are both equipped with stirring assemblies. The two sets of stirring assemblies are used to stir the sludge inside the catalyst activator and the wet oxidizer respectively. The stirring assemblies can also be used to clean the inner walls of the catalyst activator and the wet oxidizer.

[0011] The stirring assembly consists of a connecting cover, a rotating frame, a stirring rod, multiple sets of sleeves, multiple sets of movable rods and two sets of scrapers. The connecting cover is located on the top of the catalyst activator or the wet oxidizer. The rotating frame is rotatably connected to the bottom of the connecting cover. The stirring rod is fixedly connected to the inside of the rotating frame. The multiple sets of sleeves are respectively fixedly connected to both ends of the rotating frame. The movable rod is slidably connected to one end of the sleeve away from the rotating frame. The two sets of scrapers are respectively located at both ends of the rotating frame and on the outside of the multiple sets of movable rods.

[0012] The dehydration unit is used to dehydrate the sludge, and the dehydration unit can also be used to steam humidify the sludge;

[0013] The heat exchanger is used to perform heat exchange between cold and hot sludge.

[0014] The treatment system of the present technical solution is used to introduce the sludge into the interior of the feed hopper so that the sludge can be introduced into the interior of the connecting shell, and the second drive motor is started to drive the conveying auger to rotate. When the sludge is introduced into the interior of the connecting shell, the sludge can be squeezed and dehydrated, and the moisture is introduced into the interior of the collection box through the filter plate to dehydrate the sludge. When the sludge needs to be steam humidified, the steam is introduced into the interior of the second rotating tube so that the steam is introduced into the interior of the conveying auger and contacts the sludge through multiple groups of second nozzles, thereby being able to steam humidify the sludge. After the sludge steam humidification is completed, the telescopic air is started. The cylinder drives the baffle plate to move, so that the sludge can be introduced into the interior of the lower hopper and discharged from the interior of the connecting shell. The sludge delivery pump is started to introduce the sludge into the interior of the heat exchange tube through the delivery pipe. With multiple sets of guide pipes and another set of delivery pipes, it can be introduced into the interior of the catalyst activator, and oxidant and catalyst are added to treat the sludge. The sludge is then introduced into the interior of the wet oxidizer through the connecting pipe for wet oxidation reaction. The sludge after oxidation treatment enters the heat exchanger to reduce the temperature to below 80℃, and the waste heat of the sludge is recovered. The sludge is heat exchanged through the heat exchange tube and the metal conduction plate. The guide air is started. The fan introduces the gas inside the heat exchanger so that the gas can flow with heat and effectively recover the waste heat. Finally, the sludge is dehydrated. The two sets of first drive motors are started to drive the second synchronous wheel to rotate. The first synchronous wheel is driven to rotate through the synchronous belt, so that the rotating frame rotates, and the stirring rod is driven to rotate to stir the sludge inside the catalyst activator and the wet oxidizer, so that the sludge can be effectively reacted. When the inner wall of the catalyst activator or the wet oxidizer needs to be cleaned, the water flow is introduced into the interior of the first rotating tube so that the water flow is introduced into the cavity. Inside, water is introduced into the interior of multiple groups of first spray holes through the cavity, so that the water flow contacts the inner wall of the catalyst activator or the wet oxidizer, and the sludge attached to the inner wall is cleaned. The moving rod is driven to move by the compression spring, and the scraper can be driven to move by multiple groups of moving rods, so that the scraper can fit the inner wall of the catalyst activator or the wet oxidizer. Through the rotation of the rotating frame, the two groups of scrapers are rotated and displaced with the rotating frame as the center of the circle to clean the attached sludge. The overall design can effectively clean the sludge and prevent excessive sludge from adhering to the inner wall, affecting the treatment of the sludge.

[0015] Preferably, the moving rod is fixedly connected to the scraper, a receiving groove is provided inside the sleeve, a compression spring is fixedly connected inside the receiving groove, and the compression spring is fixedly connected to the moving rod.

[0016] Furthermore, first spray holes are provided at both ends of the sleeve, a first filter is fixedly connected to the front end of the first spray hole, a cavity is provided inside the rotating frame, and the first spray hole and the cavity are designed to be interconnected.

[0017] Furthermore, the top of the connecting cover is rotatably connected to a first synchronous wheel, the first synchronous wheel is fixedly connected to the rotating frame, and the top of the first synchronous wheel is rotatably connected to a first rotating tube.

[0018] Furthermore, a synchronous belt is provided on the outside of the first synchronous wheel, and a second synchronous wheel is provided at one end of the synchronous belt away from the first synchronous wheel. The second synchronous wheel is rotatably connected to the connecting cover, and the interior of the second synchronous wheel is fixedly connected to the driving end of the first driving motor.

[0019] Furthermore, the dehydration unit includes a frame located outside the multiple groups of heat exchangers, the top of the frame is fixedly connected to a connecting shell, the interior of the connecting shell is rotatably connected to a conveying auger, the interior of the conveying auger is provided with multiple groups of second spray holes, the bottom end of the connecting shell is fixedly connected to a filter plate, and the middle of the bottom of the frame is fixedly connected to a collection box.

[0020] Furthermore, the rear end of the connecting shell is fixedly connected to a second rotating tube, the second rotating tube is rotatably connected to the conveying auger, the conveying auger is designed in a conical structure, and the front end of the conveying auger is fixedly connected to the driving end of the second driving motor.

[0021] Furthermore, the top of the connecting shell is fixedly connected to a feed hopper, the rear end of the connecting shell and the outside of the conveying auger are slidably connected to a blocking plate, both sides of the blocking plate are fixedly connected to the driving ends of the telescopic cylinder, and the rear end of the bottom of the connecting shell is fixedly connected to a lower hopper.

[0022] Furthermore, two groups of heat exchange tubes are fixedly connected inside the heat exchanger, and multiple groups of metal conduction plates are fixedly connected to the outside of the two groups of heat exchange tubes. Multiple groups of guide fans are fixedly connected to the front end of the heat exchanger. Multiple groups of heat exchange tubes are connected through multiple groups of guide tubes. The lower hopper, catalyst activator and wet oxidizer are respectively connected to the heat exchange tubes through conveying pipes. The catalyst activator and the wet oxidizer are connected through connecting pipes. Sludge conveying pumps are provided on the outside of the connecting pipes, conveying pipes and guide pipes.

[0023] Furthermore, the inner wall of the heat exchanger is fixedly connected with insulation cotton, and an insulation board is provided on the outside of the insulation cotton. An insulation cavity is opened between the inner wall of the heat exchanger and the insulation board and the insulation cotton. The interior of the insulation cavity is filled with inert gas, and the interior of the insulation cavity is fixedly connected with multiple sets of reinforcement plates.

[0024] (3) Beneficial effects

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The treatment system of the present invention is designed with a stirring component, which is mainly composed of a connecting cover, a rotating frame, a stirring rod, multiple sets of sleeves, multiple sets of moving rods and two sets of scrapers. The connecting cover is located at the top of the catalyst activator or wet oxidizer, the rotating frame is rotatably connected to the bottom of the connecting cover, the stirring rod is fixedly connected to the inside of the rotating frame, the multiple sets of sleeves are respectively fixedly connected to the two ends of the rotating frame, the moving rod is slidably connected to the end of the sleeve away from the rotating frame, and the two sets of scrapers are respectively located at the two ends of the rotating frame and on the outside of the multiple sets of moving rods. When the first drive motor is started, it will drive the second synchronous wheel to rotate, and further drive the first synchronous wheel to rotate through the synchronous belt, so that the rotating frame rotates, and then drives the stirring rod and scraper to perform stirring and cleaning actions. Through the rotation of the stirring rod, the sludge inside the catalyst activator and the wet oxidizer can be effectively stirred to ensure that the sludge is fully mixed with the catalyst, oxidant, etc., thereby improving the reaction efficiency. The design of the scraper enables the inner wall of the container to be cleaned while stirring, preventing the sludge from adhering for a long time and causing the equipment performance to decline.

[0027] 2. The treatment system of the present invention is designed with a dehydration unit. The dehydration unit includes components such as a frame, a connecting shell, a conveying auger, a filter plate and a collecting box. The sludge enters the connecting shell through the feed hopper, and the second drive motor is started to drive the conveying auger to rotate, thereby squeezing and dehydrating the sludge. The water penetrates into the collecting box through the filter plate, and the dehydrated sludge continues to move forward. The design of the conveying auger enables the sludge to be fully dehydrated during the squeezing process, thereby improving the dehydration efficiency. It can also be used to perform steam humidification treatment on the sludge. The components of the dehydration unit are reasonably arranged, compact in structure, and occupy little space.

[0028] 3. The treatment system of the present invention adopts the design of a heat exchanger. Two sets of heat exchange tubes are fixed inside the heat exchanger. Multiple sets of metal conduction plates are fixedly connected to the outside of the heat exchange tubes. When the sludge enters the heat exchange tubes through the conveying pipes, the cold and hot sludges are heat exchanged through the metal conduction plates. At the same time, the guide fan is started to introduce the gas inside the heat exchanger, so that the gas can carry heat and flow, further improving the heat exchange efficiency. Through the coordinated action of the metal conduction plates and the guide fan, the waste heat resources in the sludge can be efficiently recovered. The inner wall of the heat exchanger is provided with insulation cotton, insulation plates and insulation cavity and other components, which can enhance the thermal insulation effect of the heat exchanger and prevent it from deformation due to thermal expansion and contraction, thereby ensuring the long-term stable operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the device of the present invention;

[0030] Figure 2 This is a schematic diagram of the structure of the stirring assembly of the device of the present invention;

[0031] Figure 3This is a schematic diagram of the rotating frame structure of the device of the present invention;

[0032] Figure 4 This is a schematic diagram of the three-dimensional structure of the sleeve of the device of the present invention;

[0033] Figure 5 This is a schematic diagram of the connecting shell structure of the device of the present invention;

[0034] Figure 6 This is a schematic diagram of the rack structure of the device of the present invention;

[0035] Figure 7 This is a schematic diagram of the three-dimensional structure of the conveying auger of the device of the present invention;

[0036] Figure 8 This is a schematic diagram of the heat exchanger structure of the device of the present invention;

[0037] Figure 9 This is a schematic diagram of the metal conductive plate structure of the device of the present invention;

[0038] Figure 10 This is a cross-sectional view of the inner wall structure of the connecting shell of the device of the present invention;

[0039] The marks in the accompanying drawings are: 1. heat exchanger; 2. catalyst activator; 3. wet oxidizer; 4. stirring assembly; 5. connecting cover; 6. rotating frame; 7. stirring rod; 8. sleeve; 9. moving rod; 10. scraper; 11. receiving tank; 12. compression spring; 13. first spray hole; 14. cavity; 15. first synchronous wheel; 16. first rotating tube; 17. synchronous belt; 18. second synchronous wheel; 19. frame; 20. connecting shell; 21. conveying auger; 22. second spray hole; 23. collecting box; 24. second rotating tube; 25. feed hopper; 26. baffle plate; 27. heat exchange tube; 28. metal conduction plate; 29. guide fan; 30. guide tube; 31. conveying tube; 32. connecting tube; 33. thermal insulation cotton; 34. thermal insulation board; 35. thermal insulation cavity; 36. reinforcement plate. DETAILED DESCRIPTION

[0040] This specific embodiment is a multi-stage forced circulation heat exchange sludge wet oxidation treatment system, and its structural diagram is as follows Figure 1-10 As shown, the treatment system includes a dehydration unit, multiple sets of heat exchangers 1, a catalyst activator 2 and a wet oxidizer 3; the catalyst activator 2 is located outside the dehydration unit, the wet oxidizer 3 is located outside the catalyst activator 2, and the multiple sets of heat exchangers 1 are located between the dehydration unit, the catalyst activator 2 and the wet oxidizer 3;

[0041] The catalyst activator 2 and the wet oxidizer 3 are both provided with stirring assemblies 4. The two sets of stirring assemblies 4 are used to stir the sludge inside the catalyst activator 2 and the wet oxidizer 3 respectively. The stirring assemblies 4 can also be used to clean the inner walls of the catalyst activator 2 and the wet oxidizer 3.

[0042] The stirring assembly 4 is composed of a connecting cover 5, a rotating frame 6, a stirring rod 7, multiple sets of sleeves 8, multiple sets of moving rods 9 and two sets of scrapers 10. The connecting cover 5 is located at the top of the catalyst activator 2 or the wet oxidizer 3. The rotating frame 6 is rotatably connected to the bottom of the connecting cover 5. The stirring rod 7 is fixedly connected to the inside of the rotating frame 6. The multiple sets of sleeves 8 are respectively fixedly connected to the two ends of the rotating frame 6. The moving rod 9 is slidably connected to one end of the sleeve 8 away from the rotating frame 6. The two sets of scrapers 10 are respectively located at the two ends of the rotating frame 6 and on the outside of the multiple sets of moving rods 9.

[0043] The dehydration unit is used to dehydrate the sludge, and the dehydration unit can also be used to steam humidify the sludge;

[0044] The heat exchanger 1 is used to perform heat exchange treatment on the cold and hot sludges.

[0045] In this embodiment, the moving rod 9 and the scraper 10 are fixedly connected, and a receiving groove 11 is provided inside the sleeve 8. A compression spring 12 is fixedly connected inside the receiving groove 11. The compression spring 12 is fixedly connected to the moving rod 9. The moving rod 9 is moved by the compression spring 12. The scraper 10 can be moved by multiple groups of moving rods 9, so that the scraper 10 can fit the inner wall of the catalyst activator 2 or the wet oxidizer 3.

[0046] Secondly, in the present embodiment, both ends of the sleeve 8 are provided with a first spray hole 13, the front end of the first spray hole 13 is fixedly connected to the first filter screen, the interior of the rotating frame 6 is provided with a cavity 14, the first spray hole 13 and the cavity 14 are designed to be interconnected, the top of the connecting cover 5 is rotatably connected to the first synchronous wheel 15, the first synchronous wheel 15 is fixedly connected to the rotating frame 6, the top of the first synchronous wheel 15 is rotatably connected to the first rotating tube 16, the outer side of the first synchronous wheel 15 is provided with a synchronous belt 17, the end of the synchronous belt 17 away from the first synchronous wheel 15 is provided with a second synchronous wheel 18, the second synchronous wheel 18 is rotatably connected to the connecting cover 5, the interior of the second synchronous wheel 18 is fixedly connected to the driving end of the first drive motor, the first drive motor is started, the second synchronous wheel 18 is driven to rotate, and the first synchronous wheel 1 is driven by the synchronous belt 17. 5 rotates, causing the rotating frame 6 to rotate, driving the stirring rod 7 to rotate, stirring the sludge inside the catalyst activator 2 or the wet oxidizer 3, so that the sludge can be effectively treated. When the inner wall of the catalyst activator 2 or the wet oxidizer 3 needs to be cleaned, the water flow is introduced into the interior of the first rotating tube 16, so that the water flow is introduced into the interior of the cavity 14, and is introduced into the interior of the multiple groups of first spray holes 13 through the cavity 14, so that the water flow contacts the inner wall of the catalyst activator 2 or the wet oxidizer 3, and the sludge attached to the inner wall is cleaned. Through the rotation of the rotating frame 6, the two groups of scrapers 10 rotate and displace with the rotating frame 6 as the center of the circle to clean the attached sludge. Through the overall design, the sludge can be effectively cleaned to prevent excessive sludge from adhering to the inner wall, which affects the treatment of the sludge.

[0047] In addition, in this embodiment, the dehydration unit includes a frame 19 located outside the multiple groups of heat exchangers 1, the top of the frame 19 is fixedly connected to a connecting shell 20, the interior of the connecting shell 20 is rotatably connected to a conveying auger 21, and the interior of the conveying auger 21 is provided with multiple groups of second spray holes 22, the bottom end of the connecting shell 20 is fixedly connected to a filter plate, the middle of the bottom of the frame 19 is fixedly connected to a collecting box 23, the rear end of the connecting shell 20 is fixedly connected to a second rotating tube 24, the second rotating tube 24 is rotatably connected to the conveying auger 21, and the conveying auger 21 is provided with a plurality of second spray holes 22. The conveying auger 21 is designed in a conical structure. The front end of the conveying auger 21 is fixedly connected to the driving end of the second driving motor. When the second driving motor is started, the conveying auger 21 is driven to rotate. When the sludge is introduced into the interior of the connecting shell 20, the sludge can be squeezed and dehydrated. The water is introduced into the interior of the collecting box 23 through the filter plate. When the sludge needs to be steam humidified, the steam is introduced into the interior of the second rotating tube 24, so that the steam is introduced into the interior of the conveying auger 21 and contacts the sludge through the multiple groups of second spray holes 22, thereby performing steam humidification treatment on the sludge.

[0048] Furthermore, in this embodiment, a feed hopper 25 is fixedly connected to the top of the connecting shell 20, and a baffle plate 26 is slidably connected to the rear end of the interior of the connecting shell 20 and located on the outside of the conveying auger 21. Both sides of the baffle plate 26 are fixedly connected to the driving end of the telescopic cylinder. The rear end of the bottom of the connecting shell 20 is fixedly connected to the lower hopper, and the sludge is introduced into the interior of the feed hopper 25 so that the sludge can be introduced into the interior of the connecting shell 20. After the sludge steam humidification is completed, the telescopic cylinder is started to drive the baffle plate 26 to move, so that the sludge can be introduced into the interior of the lower hopper and discharged from the interior of the connecting shell 20.

[0049] Furthermore, in this embodiment, two groups of heat exchange tubes 27 are fixedly connected to the interior of the heat exchanger 1, and multiple groups of metal conduction plates 28 are fixedly connected to the outside of the two groups of heat exchange tubes 27. Multiple groups of guide fans 29 are fixedly connected to the front end of the interior of the heat exchanger 1. The multiple groups of heat exchange tubes 27 are connected by multiple groups of guide tubes 30. The lower hopper, catalyst activator 2 and wet oxidizer 3 are respectively connected to the heat exchange tubes 27 through conveying pipes 31. The catalyst activator 2 and the wet oxidizer 3 are connected through connecting pipes 32. The connecting pipes 32, the conveying pipes 31 and the outside of the guide pipes 30 are all provided with sludge conveying pumps. When the sludge is introduced into the interior of the lower hopper, the sludge conveying pump is started to convey the sludge through the conveying pipes 31. The pipe 31 is introduced into the interior of the heat exchange pipe 27, and is combined with multiple sets of guide pipes 30 and another set of conveying pipes 31 to be introduced into the interior of the catalyst activator 2, where oxidants and catalysts are added to treat the sludge. The sludge is then introduced into the interior of the wet oxidizer 3 through the connecting pipe 32 for wet oxidation reaction. The oxidized sludge enters the heat exchanger 1 to reduce the temperature to below 80°C, and the waste heat of the sludge is recovered. The sludge is heat-exchanged through the heat exchange pipe 27 in combination with the metal conduction plate 28. The guide fan 29 is started to introduce gas into the heat exchanger 1, allowing the gas to carry heat and flow, effectively recovering the waste heat. Finally, the sludge is dehydrated.

[0050] Furthermore, in this embodiment, a heat insulating cotton 33 is fixedly connected to the inner wall of the heat exchanger 1, and a heat insulating plate 34 is provided on the outer side of the heat insulating cotton 33. A heat insulating cavity 35 is defined between the inner wall of the heat exchanger 1 and the heat insulating plate 34 and the heat insulating cotton 33. The heat insulating cavity 35 is filled with an inert gas. A plurality of groups of reinforcing plates 36 are fixedly connected to the interior of the heat insulating cavity 35. The reinforcing plates 36 can increase the strength of the heat exchanger 1 and prevent the heat exchanger 1 from expanding and contracting due to heat and being easily deformed. When the heat exchanger 1 is in operation, the heat insulating effect of the heat exchanger 1 can be increased by the heat insulating plate 34, the heat insulating cotton 33 and the heat insulating cavity 35, thereby preventing the heat flow rate from being affected and affecting the recovery of waste heat.

[0051] When the device of the present technical solution is used, the sludge is introduced into the interior of the feed hopper 25 so that the sludge can be introduced into the interior of the connecting shell 20, the second drive motor is started, and the conveying auger 21 is driven to rotate. When the sludge is introduced into the interior of the connecting shell 20, the sludge can be squeezed and dehydrated, and the moisture is introduced into the interior of the collecting box 23 through the filter plate to dehydrate the sludge. When the sludge needs to be steam humidified, the steam is introduced into the interior of the second rotating tube 24 so that the steam is introduced into the interior of the conveying auger 21 and contacts the sludge through the multiple groups of second nozzles 22, so that the sludge can be steam humidified. After the sludge steam humidification is completed, the telescopic cylinder is started to drive the baffle plate 26 to move into position. The sludge is moved so that it can be introduced into the interior of the lower hopper and discharged from the interior of the connecting shell 20. The sludge conveying pump is started to introduce the sludge into the interior of the heat exchange tube 27 through the conveying pipe 31. In combination with multiple sets of guide tubes 30 and another set of conveying pipes 31, the sludge can be introduced into the interior of the catalyst activator 2, and oxidant and catalyst are added to treat the sludge. The sludge is then introduced into the interior of the wet oxidizer 3 through the connecting pipe 32 for wet oxidation reaction. The sludge after oxidation treatment enters the heat exchanger 1 to reduce the temperature to below 80°C, and the waste heat of the sludge is recovered. The sludge is subjected to heat exchange treatment through the heat exchange tube 27 in combination with the metal conduction plate 28. The guide fan 29 is started to introduce the gas into the interior of the heat exchanger 1. The gas can carry heat to flow, effectively recover the waste heat, and finally dehydrate the sludge. Start the two sets of first drive motors to drive the second synchronous wheel 18 to rotate, and drive the first synchronous wheel 15 to rotate through the synchronous belt 17, so that the rotating frame 6 rotates, and drives the stirring rod 7 to rotate, stirring the sludge inside the catalyst activator 2 and the wet oxidizer 3, so that the sludge can be effectively reacted. When it is necessary to clean the inner wall of the catalyst activator 2 or the wet oxidizer 3, the water flow is introduced into the interior of the first rotating tube 16, so that the water flow is introduced into the interior of the cavity 14, and then introduced into the interior of the multiple groups of first spray holes 13 through the cavity 14, so that the water The flow contacts the inner wall of the catalyst activator 2 or the wet oxidizer 3 to clean the sludge attached to the inner wall. The moving rod 9 is driven to move by the compression spring 12. The scraper 10 can be driven to move by multiple groups of moving rods 9, so that the scraper 10 can fit the inner wall of the catalyst activator 2 or the wet oxidizer 3. Through the rotation of the rotating frame 6, the two groups of scrapers 10 are rotated and displaced with the rotating frame 6 as the center to clean the attached sludge. Through the overall design, the sludge can be effectively cleaned to prevent excessive sludge from adhering to the inner wall and affecting the treatment of the sludge. Compared with the existing treatment system, the present invention can improve the overall practicality of the treatment system through design.

[0052] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the scope of protection of the present invention.

Claims

1. A multi-stage forced circulation heat exchange sludge wet oxidation treatment system, the treatment system comprising a dehydration unit, multiple sets of heat exchangers (1), a catalyst activator (2) and a wet oxidizer (3); characterized in that: The catalyst activator (2) is located outside the dehydration unit, the wet oxidizer (3) is located outside the catalyst activator (2), and multiple groups of heat exchangers (1) are located between the dehydration unit, the catalyst activator (2) and the wet oxidizer (3); The catalyst activator (2) and the wet oxidizer (3) are both provided with stirring assemblies (4), and the two sets of stirring assemblies (4) are used to stir the sludge inside the catalyst activator (2) and the wet oxidizer (3), respectively. The stirring assemblies (4) can also be used to clean the inner walls of the catalyst activator (2) and the wet oxidizer (3); The stirring assembly (4) is composed of a connecting cover (5), a rotating frame (6), a stirring rod (7), multiple groups of sleeves (8), multiple groups of moving rods (9) and two groups of scrapers (10), the connecting cover (5) is located at the top of the catalyst activator (2) or the wet oxidizer (3), the rotating frame (6) is rotatably connected to the bottom of the connecting cover (5), the stirring rod (7) is fixedly connected to the inside of the rotating frame (6), the multiple groups of sleeves (8) are respectively fixedly connected to the two ends of the rotating frame (6), the moving rod (9) is slidably connected to one end of the sleeve (8) away from the rotating frame (6), and the two groups of scrapers (10) are respectively located at the two ends of the rotating frame (6) and located on the outside of the multiple groups of moving rods (9); The dehydration unit is used to dehydrate the sludge, and the dehydration unit can also be used to steam humidify the sludge; The heat exchanger (1) is used for heat exchange treatment of cold and hot sludge.

2. A multi-stage forced circulation heat exchange sludge wet oxidation treatment system according to claim 1, characterized in that: The moving rod (9) is fixedly connected to the scraper (10); a receiving groove (11) is provided inside the sleeve (8); a compression spring (12) is fixedly connected inside the receiving groove (11); and the compression spring (12) is fixedly connected to the moving rod (9).

3. A multi-stage forced circulation heat exchange sludge wet oxidation treatment system according to claim 2, characterized in that: Both ends of the sleeve (8) are provided with first spray holes (13), the front end of the first spray hole (13) is fixedly connected to a first filter screen, and a cavity (14) is provided inside the rotating frame (6), and the first spray hole (13) and the cavity (14) are designed to be interconnected.

4. The multi-stage forced circulation heat exchange sludge wet oxidation treatment system according to claim 1, characterized in that: The top of the connecting cover (5) is rotatably connected to a first synchronous wheel (15), the first synchronous wheel (15) is fixedly connected to the rotating frame (6), and the top of the first synchronous wheel (15) is rotatably connected to a first rotating tube (16).

5. A multi-stage forced circulation heat exchange sludge wet oxidation treatment system according to claim 4, characterized in that: A synchronous belt (17) is provided on the outer side of the first synchronous wheel (15); a second synchronous wheel (18) is provided on one end of the synchronous belt (17) away from the first synchronous wheel (15); the second synchronous wheel (18) is rotatably connected to the connecting cover (5); and the interior of the second synchronous wheel (18) is fixedly connected to the driving end of the first driving motor.

6. The multi-stage forced circulation heat exchange sludge wet oxidation treatment system according to claim 1, characterized in that: The dehydration unit comprises a frame (19) located outside the plurality of heat exchangers (1); a connecting shell (20) is fixedly connected to the top of the frame (19); a conveying auger (21) is rotatably connected to the interior of the connecting shell (20); a plurality of second spray holes (22) are provided inside the conveying auger (21); a filter plate is fixedly connected to the bottom end of the connecting shell (20); and a collecting box (23) is fixedly connected to the middle of the bottom of the frame (19).

7. The multi-stage forced circulation heat exchange sludge wet oxidation treatment system according to claim 6, characterized in that: The rear end of the connecting shell (20) is fixedly connected to a second rotating tube (24), and the second rotating tube (24) is rotatably connected to a conveying auger (21). The conveying auger (21) is designed in a conical structure, and the front end of the conveying auger (21) is fixedly connected to the driving end of a second driving motor.

8. The multi-stage forced circulation heat exchange sludge wet oxidation treatment system according to claim 7, characterized in that: The top of the connecting shell (20) is fixedly connected to a feed hopper (25); the rear end of the interior of the connecting shell (20) and located outside the conveying auger (21) is slidably connected to a blocking plate (26); both sides of the blocking plate (26) are fixedly connected to the driving ends of the telescopic cylinder; the rear end of the bottom of the connecting shell (20) is fixedly connected to a lower hopper.

9. The multi-stage forced circulation heat exchange sludge wet oxidation treatment system according to claim 8, characterized in that: Two groups of heat exchange tubes (27) are fixedly connected inside the heat exchanger (1), and multiple groups of metal conduction plates (28) are fixedly connected to the outside of the two groups of heat exchange tubes (27). Multiple groups of guide fans (29) are fixedly connected to the front end of the heat exchanger (1). Multiple groups of heat exchange tubes (27) are connected through multiple groups of guide tubes (30). The lower hopper, catalyst activator (2) and wet oxidizer (3) are respectively connected to the heat exchange tubes (27) through conveying pipes (31). The catalyst activator (2) and wet oxidizer (3) are connected through connecting pipes (32). Sludge conveying pumps are provided on the outside of the connecting pipes (32), conveying pipes (31) and guide pipes (30).

10. The multi-stage forced circulation heat exchange sludge wet oxidation treatment system according to claim 9, characterized in that: The inner wall of the heat exchanger (1) is fixedly connected with a heat insulation cotton (33), and a heat insulation board (34) is provided on the outer side of the heat insulation cotton (33). A heat insulation cavity (35) is provided on the inner wall of the heat exchanger (1) and between the heat insulation board (34) and the heat insulation cotton (33). The heat insulation cavity (35) is filled with an inert gas, and the interior of the heat insulation cavity (35) is fixedly connected with multiple groups of reinforcing plates (36).

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