Sludge drying treatment device with waste heat recovery function

Abstract

The invention relates to the technical field of sludge drying treatment, in particular to a sludge drying treatment device with a waste heat recovery function. Comprising a preheating chamber and a drying chamber, a drying net and a flattening mechanism are arranged in the drying chamber, a hot air pipe is arranged below the drying net and communicated with a fuel gas auxiliary heating device, first air guide pipes are arranged at the top of the drying chamber and the bottom of the preheating chamber, a heat recovery barrel is arranged on one side of the discharging end of the drying chamber, and a sludge turning device and a heat exchange device are arranged in the heat recovery barrel. The air inlet end and the air outlet end of the heat exchange device are communicated through a heat conduction pipeline penetrating through the axis of the heat recovery cylinder, a third air guide pipe is arranged at the top of the preheating chamber, and a solar heating plate is arranged at the top of the preheating chamber. The device has a function of recycling waste heat for many times, and heat in high-temperature waste gas and dried sludge can be recycled. Sludge can be evenly laid on the drying net, excessive or insufficient local drying is avoided, high-temperature dried sludge can be fully subjected to heat exchange and utilization, and heat loss is reduced.

Description

Technical Field

[0001] This invention relates to the field of sludge drying treatment technology, specifically to a sludge drying treatment device with waste heat recovery function. Background Technology

[0002] With the acceleration of urbanization and the improvement of sewage treatment capacity, the output of sludge, a byproduct of sewage treatment, is increasing year by year. Sludge has a complex composition, containing large amounts of water, organic matter, and trace pollutants. Improper treatment can easily lead to environmental problems such as soil pollution and eutrophication of water bodies. Therefore, sludge reduction and harmless treatment have become one of the core issues in the environmental protection field. Hot air drying technology has become the mainstream sludge reduction technology because it can rapidly reduce the moisture content of sludge, laying the foundation for subsequent incineration, landfill, or resource utilization.

[0003] Chinese Patent Publication No. CN109626781B discloses a multi-stage heat recovery drying device for sludge. It includes a drying mechanism, a feeding hopper, a receiving mechanism, a heat recovery mechanism, a drainage mechanism, and a storage mechanism. The side wall of the machine body is connected to a rectangular cylinder with a central hole fixed to the surface of the base plate. The two inner side walls of the cylinder are welded with a first drying pipe and a second drying pipe at equal intervals and in an alternating manner, forming an "S"-shaped flue. Sludge is added from the feeding hopper to the first and second drying pipes, heating the sludge inside the pipes and utilizing waste heat in multiple stages. A receiving mechanism is welded to the side of the cylinder to collect spilled material and recover heat from the cylinder's side. However, this patent only addresses the recovery of high-temperature waste gas generated during the drying process, neglecting the significant sensible heat carried by the dried sludge itself, resulting in a generally low overall heat recovery rate and significant energy loss.

[0004] Existing waste heat recovery systems are mostly independent modules, lacking coordinated design with core processes such as sludge preheating and hot air preparation. For example, waste heat from exhaust gas is not directly used to preheat the sludge to be treated, resulting in additional energy consumption in the preheating stage. Furthermore, during sludge feeding and replacement, the drying chamber is prone to connection with the outside environment, causing significant heat loss and further reducing the system's energy efficiency. Traditional equipment often relies on fossil fuels for hot air heating, resulting in high heating costs and large carbon emissions. Summary of the Invention

[0005] Therefore, it is necessary to provide a sludge drying treatment device with waste heat recovery function to address the existing technical problems.

[0006] To solve the problems of the prior art, the technical solution adopted by the present invention is as follows:

[0007] This invention provides a sludge drying treatment device with waste heat recovery function, including a preheating chamber and a drying chamber connected to its discharge end. The drying chamber is equipped with a drying net and a leveling mechanism that can horizontally spread the sludge on the drying net. A hot air pipe is provided below the drying net, and a gas-fired auxiliary heating device is connected to the hot air pipe. A first air guide pipe is provided at the top of the drying chamber and the bottom of the preheating chamber. A heat recovery cylinder is provided on one side of the discharge end of the drying chamber. A sludge turning device and a heat exchange device are provided inside the heat recovery cylinder. The air inlet and air outlet of the heat exchange device are connected by a heat-conducting pipe passing through the axis of the heat recovery cylinder. The air outlet of the heat exchange device is connected to the preheating chamber through a second air guide pipe. A third air guide pipe is provided at the top of the preheating chamber. A solar heating panel is provided at the top of the preheating chamber. One end of the hot air pipe is connected to the air outlet of the solar heating panel. The air inlet of the solar heating panel is connected to a fresh air pipe. The fresh air pipe exchanges heat with the third air guide pipe through a heat exchanger.

[0008] Preferably, the leveling mechanism is provided with a receiving platform and a pushing plate. The receiving platform is horizontally slidably installed in the drying chamber. The inner wall of the drying chamber is provided with a horizontal guide rail for the receiving platform to slide. The discharge end of the preheating chamber is provided with a discharge port. The receiving platform is sealed to the discharge port when receiving materials. The receiving platform is provided with a movable plate on one side along the sliding direction. The pushing plate is located on the side of the receiving platform away from the movable plate.

[0009] Preferably, a vertically sliding feed plate and a first linear driver are installed at the end of the movable plate away from the receiving platform. The first linear driver is fixedly installed on the movable plate, and the output end of the first linear driver is fixedly connected to the feed plate. Several rake teeth are fixedly installed on the bottom end of the feed plate away from the receiving platform.

[0010] Preferably, a second linear driver and a push rod are installed on the receiving platform. The push rod is fixedly installed on the second linear driver. A fixed plate that abuts against the push plate is provided on the receiving platform. The push rod is drivenly connected to the push plate. A transmission ring is fixedly installed on the push rod. The movable plate is slidably connected to the side of the receiving platform away from the movable plate through a movable rod. A transmission plate is fixedly installed on the movable rod. A first spring is provided between the transmission plate and the side wall of the receiving platform. The transmission ring can fit against the transmission plate.

[0011] Preferably, the output end of the second linear driver is provided with a telescopic section at the connection end with the pusher plate, and a second spring is provided inside the telescopic section.

[0012] Preferably, the mud-turning device includes a first rotary driver, a hollow rotating shaft, and several evenly distributed mud-turning plates. The first rotary driver is fixedly installed on the heat recovery cylinder and fixedly connected to the rotating shaft. The mud-turning plates are fixedly installed on the rotating shaft. Several mud-turning plates are grouped together and evenly distributed along the axis of the rotating shaft. Several groups of mud-turning plates are arranged in a ring around the rotating shaft. The tilting directions of the mud-turning plates in two adjacent groups are opposite.

[0013] Preferably, the heat conduction pipe consists of a first channel set inside the hollow rotating shaft, a second channel sleeved on the outer wall of the heat recovery cylinder, and a third channel set on the outer surface of the mud-turning plate. An air inlet plate and an air outlet plate are respectively installed at both ends of the heat recovery cylinder, and the two ends of the heat conduction pipe are connected to the air inlet plate and the air outlet plate respectively.

[0014] Preferably, the third channel includes folded pipes densely distributed on the surface of the mud-turning plate, and the folded pipe ports of two adjacent mud-turning plates are connected by connecting pipes, which are equipped with quick-release heads.

[0015] Preferably, the heat recovery cylinder is provided with an inlet and an outlet, and the outer side of the heat recovery cylinder is provided with an arc-shaped baffle that fits against its outer wall to close the inlet or outlet. A second rotary driver and a drive frame are installed at one end of the heat recovery cylinder. The output end of the second rotary driver is fixedly connected to the drive frame, and the drive frame is fixedly connected to the arc-shaped baffle.

[0016] Preferably, the preheating chamber is equipped with multiple horizontally arranged sludge conveyor belts, with the discharge end of the lowest sludge conveyor belt located directly above the discharge port.

[0017] The advantages of this invention compared to the prior art are:

[0018] 1. This invention features multiple waste heat recovery functions, enabling the recovery and utilization of heat from high-temperature waste gas and dried sludge. High-temperature, medium-humidity gas from the top of the drying chamber is introduced into the preheating chamber via the first air duct, directly preheating the sludge to be dried, achieving primary recovery of waste heat from the drying waste gas. Medium-temperature, high-humidity gas discharged from the preheating chamber exchanges heat with fresh air through a heat exchanger, increasing the fresh air temperature and completing secondary waste heat recovery, reducing the energy consumption required for hot air preparation. After drying, the high-temperature sludge enters the heat recovery cylinder, where it comes into full contact with multi-channel heat-conducting pipes via a sludge-turning device, efficiently absorbing the sensible heat of the sludge and introducing it into the preheating chamber, achieving tertiary waste heat recovery. This improves thermal energy utilization and provides excellent energy-saving effects. The use of a composite energy supply mode, primarily solar energy with gas as an auxiliary source, overcomes the limitations of single-energy supply.

[0019] 2. The leveling mechanism, through the combined action of the receiving platform, pusher plate, and movable plate with horizontal guide rails, achieves uniform spreading of sludge on the drying mesh, avoiding localized over- or under-drying. The discharge plate can discharge and crush the dried sludge, and in conjunction with the sludge turning device, it turns and disperses the dried sludge, ensuring full contact between the sludge and the heat exchange medium and heat transfer pipes, improving heat exchange efficiency. The drying chamber and heat recovery cylinder are closed-loop controlled through arc-shaped baffles to prevent temperature fluctuations caused by heat leakage, ensuring stable internal temperature in the drying chamber and thus accurately controlling the moisture content of the dried sludge. The heat transfer pipes feature a three-channel design with an internal rotating shaft, sleeved in the cylinder wall, and integrated with the sludge turning plate. The folded pipes and quick-release connectors maximize the heat absorption area and facilitate pipe cleaning and maintenance, preventing heat transfer efficiency reduction caused by sludge adhesion. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of a sludge drying treatment device with waste heat recovery function;

[0021] Figure 2 This is a partial three-dimensional structural diagram of a sludge drying treatment device with waste heat recovery function;

[0022] Figure 3 This is a three-dimensional exploded view of the drying chamber in a sludge drying treatment device with waste heat recovery function;

[0023] Figure 4 A schematic diagram of the three-dimensional structure of the receiving platform in a sludge drying treatment device with waste heat recovery function. Figure 1 ;

[0024] Figure 5 A schematic diagram of the three-dimensional structure of the receiving platform in a sludge drying treatment device with waste heat recovery function. Figure 2 ;

[0025] Figure 6 This is a three-dimensional exploded view of the heat recovery cylinder in a sludge drying treatment device with waste heat recovery function;

[0026] Figure 7 A schematic diagram of a partial three-dimensional structure of the heat recovery cylinder in a sludge drying treatment device with waste heat recovery function. Figure 1 ;

[0027] Figure 8 This is a front view of the heat recovery cylinder in a sludge drying treatment device with waste heat recovery function;

[0028] Figure 9 A schematic diagram of a partial three-dimensional structure of the heat recovery cylinder in a sludge drying treatment device with waste heat recovery function. Figure 2 ;

[0029] Figure 10 This is a partial three-dimensional structural diagram of the second channel in a sludge drying treatment device with waste heat recovery function.

[0030] The numbers on the map are:

[0031] 1. Preheating chamber; 2. Drying chamber; 3. Drying net; 4. Hot air duct; 5. First air guide duct; 6. Heat recovery cylinder; 7. Heat conduction pipe; 8. Second air guide duct; 9. Third air guide duct; 10. Solar heating panel; 11. Fresh air duct; 12. Receiving platform; 13. Pusher plate; 14. Horizontal guide rail; 15. Discharge port; 16. Movable plate; 17. Discharge plate; 18. First linear actuator; 19. Rake teeth; 20. Second linear actuator; 21. Push rod; 22. Fixed plate; 23. 24. Transmission ring; 25. Movable rod; 26. Transmission plate; 27. First spring; 28. Telescopic section; 29. ​​First rotary actuator; 30. Rotary shaft; 31. Sludge tipping plate; 32. First channel; 33. Second channel; 34. Third channel; 35. Air inlet plate; 36. Air outlet plate; 37. Folded pipe; 38. Connecting pipe; 39. Quick release head; 40. Feed inlet; 41. Discharge outlet; 42. Arc-shaped baffle; 43. Second rotary actuator; 44. Drive frame; 45. Sludge conveyor belt. Detailed Implementation

[0032] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0033] like Figures 1-10 The sludge drying device with waste heat recovery function shown includes a preheating chamber 1 and a drying chamber 2 connected to its discharge end. The drying chamber 2 is equipped with a drying net 3 and a leveling mechanism above it that can horizontally spread the sludge onto the drying net 3. A hot air pipe 4 is located below the drying net 3, and a gas-fired auxiliary heating device is connected to the hot air pipe 4. A first air guide pipe 5 is located at the top of the drying chamber 2 and the bottom of the preheating chamber 1. A heat recovery cylinder 6 is located on one side of the discharge end of the drying chamber 2, and a sludge turning device is installed inside the heat recovery cylinder 6. The heat exchanger is connected to the air inlet and outlet of the heat exchanger by a heat-conducting pipe 7 that passes through the axis of the heat recovery cylinder 6. The air outlet of the heat exchanger is connected to the preheating chamber 1 by a second air guide pipe 8. A third air guide pipe 9 is provided at the top of the preheating chamber 1. A solar heating plate 10 is provided at the top of the preheating chamber 1. One end of the hot air pipe 4 is connected to the air outlet of the solar heating plate 10. The air inlet of the solar heating plate 10 is connected to a fresh air pipe 11. The fresh air pipe 11 exchanges heat with the third air guide pipe 9 through a heat exchanger.

[0034] This invention enables efficient utilization of thermal energy, featuring multiple waste heat recovery functions. It allows for deep drying of sludge, ensuring effective drying. Simultaneously, it recovers heat energy from the freshly discharged dried sludge, reducing energy loss. During operation, fresh air is introduced into the solar heating panel 10, which provides heating. The solar energy heats the fresh air, which is then introduced into the drying chamber 2 via the hot air duct 4. The hot air duct 4 guides the high-temperature, low-humidity gas to the drying mesh 3 below to dry the spread sludge. High-temperature, medium-humidity gas from the top of the drying chamber 2 is introduced into the bottom of the preheating chamber 1 via the first air guide duct 5 to preheat the sludge during transport, achieving primary heat energy recovery. The third air guide duct 9 transfers the heat from the exhaust gas in the preheating chamber 1 to the fresh air via a heat exchanger, enabling heat exchange between the medium-temperature, high-humidity gas from the preheating chamber 1 and the low-temperature, low-humidity fresh air, achieving secondary heat energy recovery. The dried sludge in drying chamber 2 and after drying are discharged into heat recovery cylinder 6. Heat recovery cylinder 6 recovers the heat from the dried sludge. Heat conduction pipe 7 absorbs the heat from the dried sludge and introduces it into preheating chamber 1 for preheating, thus achieving three-stage heat energy recovery. This realizes the function of three-stage heat energy recovery and utilization, reduces heat energy loss, and improves the drying effect of sludge.

[0035] Spreading the sludge evenly on the drying mesh 3 inside the drying chamber 2 improves the drying degree. During the drying operation, the drying chamber 2 is sealed, maintaining a high and stable internal temperature. The sludge turning device can turn the discharged dried sludge, allowing the high-temperature sludge to fully contact the heat exchange device, enabling the fresh air in the heat exchange device to fully absorb the heat from the high-temperature sludge and improve heat exchange efficiency.

[0036] When the gas temperature in the hot air duct 4 does not reach the predetermined temperature, auxiliary heating can be provided by a gas-fired auxiliary heating device connected to the hot air duct 4 to ensure that the temperature of the hot air duct 4 reaches the predetermined drying temperature, thus ensuring the drying effect of the sludge. This allows the equipment to continue to operate normally even in the absence of sunlight and maintain a stable drying temperature, thereby ensuring the stable temperature of the discharged sludge and the temperature of the hot air extracted from the drying chamber 2, and reducing temperature fluctuations during equipment operation.

[0037] The leveling mechanism is equipped with a receiving platform 12 and a pushing plate 13. The receiving platform 12 is horizontally slidably installed in the drying chamber 2. The inner wall of the drying chamber 2 is equipped with a horizontal guide rail 14 for sliding the receiving platform 12. The discharge end of the preheating chamber 1 is equipped with a discharge port 15. The receiving platform 12 is sealed to the discharge port 15 when receiving materials. The receiving platform 12 is equipped with a movable plate 16 on one side along the sliding direction. The pushing plate 13 is located on the side of the receiving platform 12 away from the movable plate 16.

[0038] During the drying operation, the sludge in the preheating chamber 1 is gradually discharged into the receiving platform 12. The receiving platform 12 carries the sludge to be spread out next time. After the drying operation is completed, the dried sludge is discharged. The receiving platform 12 moves horizontally on the horizontal guide rail 14. During the movement of the receiving platform 12, the pusher plate 13 is gradually pushed forward, spreading the sludge on the receiving platform 12 onto the drying net 3 to facilitate subsequent drying operations.

[0039] When receiving material, the movable plate 16 is in contact with the receiving platform 12. At this time, the movable plate 16 and the receiving platform 12 form a bearing cavity for bearing sludge. When it is necessary to flatten the sludge, the movable plate 16 is pushed forward a short distance so that a sludge spreading channel is formed between the movable plate 16 and the receiving platform 12. Then, the pusher plate 13 pushes the sludge on the receiving platform 12 to be gradually spread on the drying screen 3 through the sludge spreading channel during the horizontal displacement process.

[0040] A vertically sliding feed plate 17 and a first linear driver 18 are installed at the end of the movable plate 16 away from the receiving platform 12. The first linear driver 18 is fixedly installed on the movable plate 16, and the output end of the first linear driver 18 is fixedly connected to the feed plate 17. Several rake teeth 19 are fixedly installed on the bottom end of the feed plate 17 away from the receiving platform 12.

[0041] When it is necessary to change the material on the drying screen 3, the receiving platform 12 is first moved to the pushing position, that is, to the end of the drying screen 3 away from the receiving port. The first linear drive 18 first drives the feeding plate 17 to move downward, so that the bottom of the feeding plate 17 is in contact with the drying screen 3. At this time, the receiving platform 12 gradually moves towards the end closer to the receiving port. The feeding plate 17 moves synchronously with the receiving platform 12, and the feeding plate 17 pushes the dried sludge on the drying screen 3 forward. At the same time, the sludge spreading channel is opened, and the sludge spreading operation is carried out simultaneously, spreading the sludge evenly on the position of the pushed-out drying screen 3. The sludge rake teeth 19 are used to initially break up the clumps of dried sludge to ensure the smooth progress of the sludge pushing operation.

[0042] The receiving platform 12 is equipped with a second linear driver 20 and a push rod 21. The push rod 21 is fixedly installed on the second linear driver 20. The receiving platform 12 is provided with a fixed plate 22 that abuts against the push plate 13. The push rod 21 is connected to the push plate 13 in a transmission manner. A transmission ring 23 is fixedly installed on the push rod 21. The movable plate 16 is slidably connected to the side of the receiving platform 12 away from the movable plate 16 through the movable rod 24. A transmission plate 25 is fixedly installed on the movable rod 24. A first spring 26 is provided between the transmission plate 25 and the side wall of the receiving platform 12. The transmission ring 23 can fit against the transmission plate 25.

[0043] Initially, the first spring 26 is compressed, the transmission ring 23 is in contact with the transmission plate 25, and the transmission plate 25 pulls the movable plate 16 through the movable rod 24, making it contact the receiving platform 12. When it is necessary to open the mud-laying channel, the second linear actuator 20 performs the first stroke. The second linear actuator 20 moves forward a certain distance, at which point the transmission ring 23 releases its contact with the transmission plate 25, the first spring 26 returns to its original position, and the transmission plate 25 drives the movable plate 16 forward through the movable rod 24, opening the mud-laying channel between the movable plate 16 and the receiving platform 12. During this process, the pusher plate 13 remains stationary. In the second stroke of the second linear actuator 20, after the mud-laying channel is opened, the second linear actuator 20 continues to output, driving the pusher plate 13, which is driven by it, to move forward, realizing the mud-pushing and unloading function.

[0044] The output end of the second linear driver 20 is provided with a telescopic section 27 at the connection end with the pusher plate 13, and a second spring is provided inside the telescopic section 27.

[0045] The cooperation between the telescopic section 27 and the second spring enables the second linear actuator 20 to have two strokes, ensuring that the pusher plate 13 remains stationary when the movable plate 16 is opened.

[0046] The mud-turning device includes a first rotary driver 28, a hollow rotating shaft 29, and several evenly distributed mud-turning plates 30. The first rotary driver 28 is fixedly installed on the heat recovery cylinder 6 and fixedly connected to the rotating shaft 29. The mud-turning plates 30 are fixedly installed on the rotating shaft 29. Several mud-turning plates 30 are grouped together and evenly distributed along the axial direction of the rotating shaft 29. Several groups of mud-turning plates 30 are arranged in a ring around the rotating shaft 29. The tilting directions of the mud-turning plates 30 in two adjacent groups are opposite.

[0047] When the sludge turning device is working, the output of the first rotator drives the hollow rotating shaft 29 fixedly connected to it to rotate. The rotating shaft 29 drives several sludge turning plates 30 fixedly installed on it to move. The sludge turning plates 30 drive the dried sludge in the heat recovery cylinder 6 to turn over, so that its heat can be evenly distributed to the heat conduction pipe. During the sludge turning process, large pieces of dried sludge can be broken up, which can not only prevent the heat inside the large pieces of sludge from not being able to dissipate and reduce heat loss, but also prevent material blockage and ensure smooth material discharge.

[0048] The heat conduction pipe 7 consists of a first channel 31 set inside the hollow rotating shaft 29, a second channel 32 sleeved on the outer wall of the heat recovery cylinder 6, and a third channel 33 set on the outer surface of the mud-turning plate 30. An air inlet plate 34 and an air outlet plate 35 are respectively installed at both ends of the heat recovery cylinder 6, and the two ends of the heat conduction pipe 7 are connected to the air inlet plate 34 and the air outlet plate 35 respectively.

[0049] To maximize and improve the recovery of heat energy from the dried sludge, the heat conduction pipeline is configured with three channels. The first channel 31 in the hollow rotating shaft 29 is used to recover heat energy from the center of the dried sludge inside the heat recovery cylinder 6. The second channel 32, fitted onto the outer wall of the heat recovery cylinder 6, absorbs the heat dissipated from the dried sludge inside the heat recovery cylinder 6. Simultaneously, the third channel 33 moves synchronously with the sludge-turning plate 30, recovering residual heat from the dried sludge that is in contact with the sludge-turning plate 30 during the turning process. All three heat conduction channels are connected through the air inlet plate 34 and air outlet plate 35 at both ends of the heat recovery cylinder 6.

[0050] The third channel 33 includes folded pipes 36 densely distributed on the surface of the mud-turning plate 30. The ports of the folded pipes 36 on two adjacent mud-turning plates 30 are connected by connecting pipes 37, and quick-release heads 38 are provided on the connecting pipes 37.

[0051] The folded pipe 36 maximizes the contact area between the third pipe and the dried sludge, ensuring that it can absorb as much heat energy as possible from the dried sludge during the sludge turning process. It also ensures that the heat conduction channel can contact more dried sludge at the same time, improving the heat absorption effect and the stability of heat absorption, ensuring the uniformity of heat exchange of the dried sludge, and avoiding the inability to quickly exchange heat due to local areas not contacting the heat conduction channel for a long time.

[0052] The heat recovery cylinder 6 is provided with an inlet 39 and an outlet 40. The outer side of the heat recovery cylinder 6 is provided with an arc-shaped baffle 41 that fits against its outer wall to close the inlet 39 or the outlet 40. A second rotary driver 42 and a drive frame 43 are installed at one end of the heat recovery cylinder 6. The output end of the second rotary driver 42 is fixedly connected to the drive frame 43, and the drive frame 43 is fixedly connected to the arc-shaped baffle 41.

[0053] When the heat recovery cylinder 6 needs to be fed, the output of the second rotary drive 42 drives the arc-shaped baffle 41 to deflect around the heat recovery cylinder 6 via the drive frame 43. During this process, one end of the arc-shaped baffle 41 opens the feed port 39, and the other end closes the discharge port 40. After feeding is completed, the arc-shaped baffle 41 resets to close both the feed port 39 and the discharge port 40. When unloading is required, the second rotary drive 42 drives the arc-shaped baffle 41 to rotate in the opposite direction via the drive frame 43, causing the discharge port 40 to open and the feed port 39 to close, ensuring that the drying chamber 2 is in a closed state and preventing excessive heat leakage that could cause a drop in the internal temperature of the drying chamber 2.

[0054] The preheating chamber 1 is equipped with multiple horizontally arranged sludge conveyor belts 44, with the discharge end of the lowest sludge conveyor belt 44 located directly above the discharge port 15.

[0055] During sludge preheating, the multi-layer sludge conveyor belt 44 gradually moves the sludge to be dried along the direction of travel of the sludge conveyor belt 44. During the movement, the sludge is gradually preheated by the hot air blown out from below and is initially dried to reduce some of the moisture content.

[0056] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A sludge drying treatment device with waste heat recovery function, characterized in that, It includes a preheating chamber (1) and a drying chamber (2) connected to its discharge end. The drying chamber (2) is equipped with a drying net (3) and a leveling mechanism above it that can horizontally spread the sludge on the drying net (3). A hot air pipe (4) is provided below the drying net (3), and a gas-assisted heating device is connected to the hot air pipe (4). A first air guide pipe (5) is provided at the top of the drying chamber (2) and the bottom of the preheating chamber (1). A heat recovery cylinder (6) is provided on one side of the discharge end of the drying chamber (2). A sludge turning device and a heat exchange device are provided inside the heat recovery cylinder (6). The air inlet and air outlet are connected by a heat-conducting pipe (7) that passes through the axis of the heat recovery cylinder (6). The air outlet of the heat exchange device is connected to the preheating chamber (1) through the second air guide pipe (8). The top of the preheating chamber (1) is provided with a third air guide pipe (9). The top of the preheating chamber (1) is provided with a solar heating plate (10). One end of the hot air pipe (4) is connected to the air outlet of the solar heating plate (10). The air inlet of the solar heating plate (10) is connected to a fresh air pipe (11). The fresh air pipe (11) exchanges heat with the third air guide pipe (9) through a heat exchanger.

2. The sludge drying treatment device with waste heat recovery function according to claim 1, characterized in that, The leveling mechanism is provided with a receiving platform (12) and a pushing plate (13). The receiving platform (12) is horizontally slidably set in the drying chamber (2). The inner wall of the drying chamber (2) is provided with a horizontal guide rail (14) for the receiving platform (12) to slide. The discharge end of the preheating chamber (1) is provided with a discharge port (15). The receiving platform (12) is sealed to the discharge port (15) when receiving materials. The receiving platform (12) is provided with a movable plate (16) on one side along the sliding direction. The pushing plate (13) is located on the side of the receiving platform (12) away from the movable plate (16).

3. A sludge drying treatment device with waste heat recovery function according to claim 2, characterized in that, A vertically sliding feed plate (17) and a first linear driver (18) are installed at one end of the movable plate (16) away from the receiving platform (12). The first linear driver (18) is fixedly installed on the movable plate (16). The output end of the first linear driver (18) is fixedly connected to the feed plate (17). Several rake teeth (19) are fixedly installed on the bottom end of the feed plate (17) away from the receiving platform (12).

4. A sludge drying treatment device with waste heat recovery function according to claim 2, characterized in that, A second linear driver (20) and a push rod (21) are installed on the receiving platform (12). The push rod (21) is fixedly installed on the second linear driver (20). A fixed plate (22) that abuts against the push plate (13) is provided on the receiving platform (12). The push rod (21) is connected to the push plate (13) in a transmission connection. A transmission ring (23) is fixedly installed on the push rod (21). The movable plate (16) is slidably connected to the side of the receiving platform (12) away from the movable plate (16) through the movable rod (24). A transmission plate (25) is fixedly installed on the movable rod (24). A first spring (26) is provided between the transmission plate (25) and the side wall of the receiving platform (12). The transmission ring (23) can fit against the transmission plate (25).

5. A sludge drying treatment device with waste heat recovery function according to claim 4, characterized in that, The output end of the second linear driver (20) is connected to the pusher plate (13) with a telescopic section (27), and a second spring is provided inside the telescopic section (27).

6. A sludge drying treatment device with waste heat recovery function according to claim 1, characterized in that, The mud-turning device includes a first rotary driver (28), a hollow rotating shaft (29), and several evenly distributed mud-turning plates (30). The first rotary driver (28) is fixedly installed on the heat recovery cylinder (6) and fixedly connected to the rotating shaft (29). The mud-turning plates (30) are fixedly installed on the rotating shaft (29). Several mud-turning plates (30) are grouped together and evenly distributed along the axis of the rotating shaft (29). Several groups of mud-turning plates (30) are arranged in a ring around the rotating shaft (29). The tilting directions of the mud-turning plates (30) in two adjacent groups are opposite.

7. A sludge drying treatment device with waste heat recovery function according to claim 6, characterized in that, The heat conduction pipe (7) consists of a first channel (31) set inside the hollow rotating shaft (29), a second channel (32) sleeved on the outer wall of the heat recovery cylinder (6) and a third channel (33) set on the outer surface of the mud-turning plate (30). The heat recovery cylinder (6) is equipped with an air inlet plate (34) and an air outlet plate (35) at both ends, and the two ends of the heat conduction pipe (7) are connected to the air inlet plate (34) and the air outlet plate (35) respectively.

8. A sludge drying treatment device with waste heat recovery function according to claim 7, characterized in that, The third channel (33) includes folded pipes (36) densely distributed on the surface of the mud-turning plate (30). The ports of the folded pipes (36) on two adjacent mud-turning plates (30) are connected by connecting pipes (37), and quick-release heads (38) are provided on the connecting pipes (37).

9. A sludge drying treatment device with waste heat recovery function according to claim 1, characterized in that, The heat recovery cylinder (6) is provided with a feed inlet (39) and a discharge outlet (40). The outer side of the heat recovery cylinder (6) is provided with an arc-shaped baffle (41) that fits against its outer wall to close the feed inlet (39) or the discharge outlet (40). A second rotary driver (42) and a drive frame (43) are installed at one end of the heat recovery cylinder (6). The output end of the second rotary driver (42) is fixedly connected to the drive frame (43), and the drive frame (43) is fixedly connected to the arc-shaped baffle (41).

10. A sludge drying treatment device with waste heat recovery function according to claim 1, characterized in that, The preheating chamber (1) is equipped with multiple horizontally arranged sludge conveyor belts (44), with the discharge end of the lowest sludge conveyor belt (44) located directly above the discharge port (15).

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