Low temperature flue gas drying device for sludge treatment

Abstract

This invention relates to the technical field of sludge drying, and in particular to a low-temperature flue gas drying device for sludge treatment. The device pushes and tumbles the sludge to ensure full contact with flue gas for drying, thereby improving the drying effect. It includes a shell with a feed inlet for sludge entry, a discharge outlet for dried sludge discharge, an air inlet for flue gas entry, and an exhaust outlet for flue gas discharge. Multiple conveying mechanisms are arranged parallel to each other inside the shell. Each conveying mechanism has a turning mechanism for turning the sludge and a cleaning mechanism for cleaning the turning mechanism. The turning mechanism includes symmetrically spaced mounting plates with multiple feeding rollers spaced along the length between the mounting plates. Each feeding roller has a drive gear at both ends, and a conveying chain is sleeved on the outside of the drive gear, meshing with it. A drive motor is located on the outside of the mounting plates, and its output end is rotatably connected to the drive gear.

Description

Technical Field

[0001] This invention relates to the technical field of sludge drying, and in particular to a low-temperature flue gas drying device for sludge treatment. Background Technology

[0002] Wastewater sludge reduction typically involves steps such as filter press dewatering, discharge, sludge drying, crushing, and incineration. In practice, some or all of these processes are used. Sludge drying is a crucial step in sludge treatment and a key process for sludge reduction. my country's energy structure is dominated by coal, with widespread use in thermal power plants and cement plants. These plants consume large amounts of energy daily, but their energy utilization rate is only 33%. Flue gas emissions are a major source of energy loss; thermal power plants and cement plants continuously emit large amounts of flue gas at temperatures typically between 120 and 200°C, constituting waste heat.

[0003] Modern sludge drying technology tends to utilize the waste heat from emitted flue gas for low-temperature drying, which not only recovers heat that would otherwise be wasted but also reduces direct energy consumption. In practice, sludge is transported to the drying area via conveyor belt, where it comes into direct contact with the warm flue gas to accelerate moisture evaporation. However, during the process, the sludge tends to pile up, resulting in uneven heating and affecting the drying effect. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a low-temperature flue gas drying device for sludge treatment, which pushes and tumbles the sludge to fully contact the flue gas for drying and improves the drying effect.

[0005] The low-temperature flue gas drying device for sludge treatment of the present invention includes a shell, wherein the shell is provided with a feed inlet for sludge entry, a discharge outlet for dried sludge discharge, an air inlet for flue gas entry, and an exhaust outlet for flue gas discharge. Multiple layers of conveying mechanisms are arranged parallel to each other inside the shell, and each layer of the conveying mechanism is provided with a turning mechanism for turning the sludge and a cleaning mechanism for cleaning the turning mechanism.

[0006] The material turning mechanism includes symmetrically spaced mounting plates, with multiple material feeding rollers spaced apart between the mounting plates along their length. Each of the material feeding rollers has a drive gear at both ends. A transmission chain is sleeved on the outside of the drive gear and meshes with the drive gear. A drive motor is located on the outside of the mounting plates, and the output end of the drive motor is rotatably connected to the drive gear.

[0007] The cleaning mechanism includes a fixed plate mounted on a mounting plate. A cleaning roller is positioned above the feeding roller, with both ends of the cleaning roller rotatably connected to the inner wall of the housing. A winding wheel is mounted on the cleaning roller, and a pull wire is wound inside the winding wheel. The tail end of the pull wire is fixedly connected to the fixed plate. Two drive gears are positioned on both sides of the mounting plate. A moving groove is positioned on the housing, and a toothed plate is positioned inside the moving groove. The toothed plate meshes with the two drive gears. A second drive motor is positioned outside the housing, and the output end of the second drive motor is rotatably connected to the second drive gear.

[0008] Furthermore, multiple paddles are spaced apart on the outer circumference of the feeding roller, and when the feeding roller rotates, the edges of the paddles contact the outer surface of the conveying mechanism and bend naturally.

[0009] Furthermore, the conveying mechanism includes a drive shaft, a driven shaft, and a conveyor belt. The drive shaft and the driven shaft are arranged in parallel and spaced apart. The two ends of the drive shaft and the driven shaft are rotatably connected to the inner wall of the housing. The conveyor belt is tensioned and sleeved on the outside of the drive shaft and the driven shaft. The conveyor belt is evenly provided with a plurality of ventilation holes for flue gas to pass through.

[0010] Furthermore, the winding wheel has a cavity, and a coil spring is wound inside the cavity. One end of the coil spring is fixedly connected to the central shaft of the winding wheel, and the other end is fixedly connected to the starting end of the pull wire.

[0011] Furthermore, the outer sides of the moving slot and the drive motor are provided with protective covers, which are fixedly connected to the housing.

[0012] Furthermore, the conveying mechanisms in each layer are staggered in the vertical direction, and the conveying directions of adjacent layers are opposite.

[0013] Furthermore, the air inlet is located on the lower side of the housing, and multiple flow equalization plates are arranged parallel to and evenly spaced at the connection between the housing and the air inlet.

[0014] Furthermore, the flow equalization plate has an "L" shaped structure, and its corners are provided with a sloped transition.

[0015] Furthermore, the housing is provided with a guide plate corresponding to the inlet and outlet. One end of the guide plate is fixedly connected to the inlet and outlet, and the other end of the guide plate not connected to the inlet and outlet is adjacent to the conveying mechanism.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] The multi-layer conveying mechanism and the turning mechanism on each conveying layer ensure that the sludge particles are turned over in the device, increasing the contact area and uniformity between the sludge and the flue gas surface, thereby accelerating the moisture evaporation process and improving the drying efficiency. The equipped cleaning mechanism automatically removes the sludge accumulated by the turning mechanism during operation, maintaining the efficient operation of the device, reducing manual intervention, improving the continuity and stability of operation, and reducing maintenance needs and potential downtime due to failure. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is a cross-sectional view of the present invention. Figure 1 ;

[0020] Figure 3 This is a cross-sectional view of the present invention. Figure 2 ;

[0021] Figure 4 yes Figure 3 A schematic diagram of the structure of part A in the diagram;

[0022] Figure 5 This is a schematic diagram of the structure when the material turning mechanism and the cleaning mechanism of the present invention are connected;

[0023] Figure 6 yes Figure 5 A structural diagram of part B in the diagram;

[0024] The attached diagram shows the following markings: 1. Shell; 2. Feed inlet; 3. Discharge outlet; 4. Air inlet; 5. Exhaust outlet; 6. Conveying mechanism; 61. Drive shaft; 62. Driven shaft; 63. Conveyor belt; 7. Turning mechanism; 71. Mounting plate; 72. Feed roller; 73. Drive gear one; 74. Conveyor chain; 75. Drive motor one; 76. Paddle; 8. Cleaning mechanism; 81. Fixing plate; 82. Cleaning roller; 83. Winding wheel; 84. Pull wire; 85. Coil spring; 86. Drive gear two; 87. Moving groove; 88. Toothed plate; 89. Drive motor two; 9. Protective cover; 10. Flow equalization plate; 11. Guide plate. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0026] In the description of this invention, it should be noted that the orientations or positional relationships indicated by terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inner", and "outer" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. This embodiment is written in a progressive manner.

[0028] like Figures 1 to 6 As shown, the low-temperature flue gas drying device for sludge treatment of the present invention includes a shell 1. The shell 1 is connected to a feed inlet 2 for sludge entry, a discharge outlet 3 for dried sludge discharge, an air inlet 4 for flue gas entry, and an exhaust outlet 5 for flue gas discharge. Multiple layers of conveying mechanisms 6 are arranged parallel to each other inside the shell 1. Each layer of conveying mechanism 6 is provided with a turning mechanism 7 for turning the sludge and a cleaning mechanism 8 for cleaning the turning mechanism 7. The turning mechanism 7 includes symmetrically spaced mounting plates 71. Multiple feeding rollers 72 are spaced apart between the mounting plates 71 along their length direction. Both ends of the feeding rollers 72 are provided with drive gears 73. A conveying chain 74 is sleeved on the outside of the drive gears 73. The conveying chain 74 meshes with the drive gears 73. A drive motor 75 is provided on the outside of the mounting plates 71. The output end of the drive motor 75 is rotatably connected to the drive gears 73.

[0029] In this embodiment, the multi-layer conveying mechanism 6 and the turning mechanism 7 equipped on each layer of conveying mechanism 6 ensure that the sludge particles are turned over in the device, thereby increasing the contact area and contact uniformity between the sludge and the flue gas surface, thus accelerating the water evaporation process and improving the drying efficiency. The cleaning mechanism 8 automatically removes the sludge accumulated by the turning mechanism 7 during operation, maintaining the efficient operation of the device, reducing manual intervention, improving the continuity and stability of the operation, and reducing maintenance needs and potential downtime due to failure.

[0030] As a specific embodiment of the above technical solution, such as Figure 4 and Figure 6As shown, multiple paddles 76 are spaced apart on the outer circumference of the feeding roller 72. When the feeding roller 72 rotates, the edges of the paddles 76 contact the outer surface of the conveying mechanism 6 and bend naturally.

[0031] In this embodiment, the sludge is effectively agitated by the paddle 76, preventing it from accumulating or clumping during transport. This allows the sludge particles to be better dispersed and tumbled on the conveyor belt, ensuring that each part of the sludge is heated evenly. This enhances the mixing and contact between the sludge and the flue gas, increases the rate of moisture evaporation, shortens the drying time, and improves drying efficiency and quality. The flexible bending design of the paddle 76 helps reduce the adhesion and accumulation of sludge on the conveying mechanism 6, effectively preventing blockage of the conveying channel, reducing the frequency and difficulty of maintenance of the conveying mechanism 6, and ensuring the continuous and stable operation of the production line.

[0032] As a preferred embodiment of the above technical solution, such as Figure 2 As shown, the conveying mechanism 6 includes a drive shaft 61, a driven shaft 62, and a conveyor belt 63. The drive shaft 61 and the driven shaft 62 are arranged in parallel and spaced apart. The two ends of the drive shaft 61 and the driven shaft 62 are rotatably connected to the inner wall of the housing 1. The conveyor belt 63 is tensioned and sleeved on the outside of the drive shaft 61 and the driven shaft 62. A plurality of ventilation holes for flue gas to pass through are evenly arranged on the conveyor belt 63.

[0033] In this embodiment, the drive shaft 61 and driven shaft 62 form a stable support frame, ensuring the smoothness and reliability of the conveyor belt 63 during operation. Even when the load changes, it can maintain good power transmission and improve the operational stability of the entire drying system. Through the vent holes, the flue gas can directly penetrate the conveyor belt 63 and contact the sludge above, increasing the contact area between the flue gas and the sludge, further accelerating the moisture evaporation process and improving the drying efficiency. At the same time, the vent holes regulate the temperature and humidity between the conveyor belt 63 and the sludge, avoiding local overheating or condensation problems and maintaining the uniformity of the drying process.

[0034] As a preferred embodiment of the above technical solution, such as Figures 2 to 6 As shown, the cleaning mechanism 8 includes a fixed plate 81, which is mounted on the mounting plate 71. A cleaning roller 82 is mounted above the feeding roller 72. Both ends of the cleaning roller 82 are rotatably connected to the inner wall of the housing 1. A winding wheel 83 is mounted on the cleaning roller 82. A pull wire 84 is wound inside the winding wheel 83. The tail end of the pull wire 84 is fixedly connected to the fixed plate 81. Two drive gears 86 are mounted on both sides of the mounting plate 71. A moving groove 87 is mounted on the housing 1. A toothed plate 88 is mounted inside the moving groove 87. The toothed plate 88 meshes with the two drive gears 86. A second drive motor 89 is mounted outside the housing 1. The output end of the second drive motor 89 is rotatably connected to the second drive gear 86.

[0035] In this embodiment, the cleaning roller 82 and the feeding roller 72 work together, and the winding wheel 83 and the pull wire 84 on them are designed to form an automated cleaning mechanism. When the drive motor 89 drives the drive gear 86 to rotate and moves on the toothed plate 88 of the moving groove 87, the pull wire 84 extends, and the cleaning roller 82 rotates accordingly, causing the cleaning roller 82 to remove the sludge residue attached to the feeding roller 72. Through automated cleaning, the need for manual cleaning is reduced, and the risk of blockage or efficiency reduction caused by untimely manual cleaning is reduced, thereby reducing maintenance time and related maintenance costs.

[0036] As a preferred embodiment of the above technical solution, such as Figure 6 As shown, a cavity is provided inside the winding wheel 83, and a coil spring 85 is wound inside the cavity. One end of the coil spring 85 is fixedly connected to the central shaft of the winding wheel 83, and the other end is fixedly connected to the starting end of the pull wire 84.

[0037] In this embodiment, the coil spring 85 provides constant tension to the pull wire 84. When the cleaning roller 82 rotates, the elastic force of the coil spring 85 ensures that the pull wire 84 always maintains an appropriate tension, avoiding the pull wire 84 from becoming loose and affecting the cleaning effect, reducing the risk of the pull wire 84 breaking or wearing, and extending the service life of the pull wire 84 and the entire cleaning mechanism 8.

[0038] As a preferred embodiment of the above technical solution, such as Figure 1 , Figure 3 , Figure 4 As shown, a protective cover 9 is provided on the outer side of the moving slot 87 and the drive motor 89, and the protective cover 9 is fixedly connected to the housing 1;

[0039] In this embodiment, the protective cover 9 ensures the sealing of the area of ​​the moving slot 87 and the drive motor 89, prevents the flue gas from leaking from the non-exhaust port 5, ensures that the flue gas flows along the predetermined path, improves the flue gas utilization efficiency, and reduces pollution to the external environment.

[0040] As a preferred embodiment of the above technical solution, such as Figure 2 As shown, each layer of conveying mechanism 6 is arranged in a staggered manner in the vertical direction, and the conveying directions of adjacent layers of conveying mechanism 6 are opposite.

[0041] In this embodiment, the space utilization of the device is maximized by staggered arrangement and reverse conveying design, so that the sludge moves between different layers in a staggered manner, prolonging its residence time inside the device, thus having more opportunities to come into contact with warm flue gas, ensuring that the sludge is heated more evenly in all parts, accelerating the water evaporation process, and improving drying efficiency.

[0042] As a preferred embodiment of the above technical solution, such as Figures 1 to 3 As shown, the air inlet 4 is located on the lower side of the housing 1, and multiple flow equalization plates 10 are arranged parallel to and evenly spaced at the connection between the housing 1 and the air inlet 4.

[0043] In this embodiment, the flue gas entering the device is evenly distributed by the flow equalization plate 10, which avoids turbulence or excessive local velocity of the flue gas when it enters the drying area, resulting in uneven heat distribution. This ensures that the flue gas is evenly covered in the entire drying area, so that the sludge on each conveyor belt can receive consistent heat, thereby improving drying efficiency and quality.

[0044] As a preferred embodiment of the above technical solution, such as Figure 2 As shown, the flow equalization plate 10 has an "L" shaped structure, and its corners are provided with a sloped transition.

[0045] In this embodiment, the sloped transition reduces the resistance and eddies when the airflow passes through, allowing the flue gas to make a smooth turn when passing through the flow equalization plate 10. This avoids the airflow turbulence and energy loss that may be caused by right-angle turns, thereby ensuring that the flue gas flow is more stable and uniform, so that the flue gas can contact the sludge more evenly and improve the efficiency of heat transfer.

[0046] As a preferred embodiment of the above technical solution, such as Figure 2 As shown, a guide plate 11 corresponding to the feed inlet 2 and the discharge outlet 3 is provided inside the housing 1. One end of the guide plate 11 is fixedly connected to the feed inlet 2 and the discharge outlet 3, and the other end of the guide plate 11 not connected to the feed inlet 2 and the discharge outlet 3 is adjacent to the conveying mechanism 6.

[0047] In this embodiment, the guide plate 11 ensures that the sludge is smoothly introduced from the feed port 2 to the conveying mechanism 6, while the dried sludge is effectively collected and guided to be discharged at the discharge port 3. This helps to maintain the continuity and stability of the material flow, avoids possible blockage or spillage of the material during the process of entering and exiting, and improves the processing efficiency.

[0048] The low-temperature flue gas drying device for sludge treatment of the present invention can be installed, connected or set up in a common mechanical manner, and can be implemented as long as it can achieve its beneficial effects.

[0049] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A low temperature flue gas drying device for sludge treatment, characterized by, Includes a shell (1), on which are connected a feed inlet (2) for sludge to enter, a discharge outlet (3) for dried sludge to be discharged, an air inlet (4) for flue gas to enter and an exhaust outlet (5) for flue gas to be discharged. Multiple layers of conveying mechanisms (6) are arranged in parallel at intervals inside the shell (1). Each layer of conveying mechanism (6) is provided with a turning mechanism (7) for turning the sludge and a cleaning mechanism (8) for cleaning the turning mechanism (7). The material turning mechanism (7) includes symmetrically spaced mounting plates (71), and multiple material feeding rollers (72) are spaced apart between the mounting plates (71) along their length direction. Both ends of the material feeding rollers (72) are provided with drive gears (73). A transmission chain (74) is sleeved on the outside of the drive gears (73). The transmission chain (74) meshes with the drive gears (73). A drive motor (75) is provided on the outside of the mounting plates (71). The output end of the drive motor (75) is rotatably connected to the drive gears (73). The cleaning mechanism (8) includes a fixed plate (81) which is mounted on a mounting plate (71). A cleaning roller (82) is mounted above the feeding roller (72). Both ends of the cleaning roller (82) are rotatably connected to the inner wall of the housing (1). A winding wheel (83) is mounted on the cleaning roller (82). A pull wire (84) is wound inside the winding wheel (83). The tail end of the pull wire (84) is fixedly connected to the fixed plate (81). Two drive gears (86) are mounted on both sides of the mounting plate (71). A moving groove (87) is mounted on the housing (1). A toothed plate (88) is mounted inside the moving groove (87). The toothed plate (88) meshes with the two drive gears (86). A second drive motor (89) is mounted outside the housing (1). The output end of the second drive motor (89) is rotatably connected to the second drive gear (86).

2. The low-temperature flue gas drying device for sludge treatment as described in claim 1, characterized in that, Multiple paddles (76) are spaced apart on the outer circumference of the feeding roller (72). When the feeding roller (72) rotates, the edges of the paddles (76) contact the outer surface of the conveying mechanism (6) and bend naturally.

3. The low-temperature flue gas drying device for sludge treatment as described in claim 1, characterized in that, The conveying mechanism (6) includes a drive shaft (61), a driven shaft (62), and a conveyor belt (63). The drive shaft (61) and the driven shaft (62) are arranged in parallel and spaced apart. The two ends of the drive shaft (61) and the driven shaft (62) are rotatably connected to the inner wall of the housing (1). The conveyor belt (63) is tensioned and sleeved on the outside of the drive shaft (61) and the driven shaft (62). The conveyor belt (63) is evenly provided with a plurality of ventilation holes for flue gas to pass through.

4. The low-temperature flue gas drying device for sludge treatment as described in claim 1, characterized in that, The winding wheel (83) has a cavity inside, and a coil spring (85) is wound inside the cavity. One end of the coil spring (85) is fixedly connected to the central axis of the winding wheel (83), and the other end is fixedly connected to the starting end of the pull wire (84).

5. The low-temperature flue gas drying device for sludge treatment as described in claim 1, characterized in that, The movable slot (87) and the second drive motor (89) are covered with a protective cover (9), which is fixedly connected to the housing (1).

6. The low-temperature flue gas drying device for sludge treatment as described in claim 1, characterized in that, The conveying mechanisms (6) in each layer are staggered in the vertical direction, and the conveying directions of adjacent conveying mechanisms (6) are opposite.

7. The low-temperature flue gas drying device for sludge treatment as described in claim 1, characterized in that, The air inlet (4) is located on the lower side of the housing (1), and multiple flow equalization plates (10) are arranged parallel to and evenly spaced at the connection between the housing (1) and the air inlet (4).

8. The low-temperature flue gas drying device for sludge treatment as described in claim 7, characterized in that, The flow equalization plate (10) has an "L" shaped structure and a sloped transition at its corner.

9. The low-temperature flue gas drying device for sludge treatment as described in claim 1, characterized in that, The housing (1) is provided with a guide plate (11) corresponding to the feed inlet (2) and the discharge outlet (3). One end of the guide plate (11) is fixedly connected to the feed inlet (2) and the discharge outlet (3), and the other end of the guide plate (11) not connected to the feed inlet (2) and the discharge outlet (3) is adjacent to the conveying mechanism (6).

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