Sludge pre-carbonization rotary dryer

Abstract

The present application relates to a kind of sludge pre-carbonization rotary dryer, including rotary drying cylinder, flue gas inlet and flue gas outlet, also including the outer tube of concentrically being arranged in the outside of the rotary drying cylinder, several holes are opened in the rotary drying cylinder, and the flue gas passage is formed between the outer tube and rotary drying cylinder;The flue gas inlet is connected to the inner cavity of rotary drying cylinder, and the flue gas outlet is communicated with the inner cavity of rotary drying cylinder;Through high-temperature flue gas, the cylinder wall of rotary drying cylinder is heated in two directions simultaneously flowing through flue gas passage and rotary drying cylinder inner cavity, can significantly improve the anti-caking ability of high-viscosity sludge and ensure the uniformity and continuity of drying process.

Description

Technical Field

[0001] This invention relates to a pre-carbonization rotary dryer for sludge, belonging to the field of dryer technology. Background Technology

[0002] A rotary drum dryer, also known as a rotating drum dryer or rotary dryer, is a type of contact-type internal heating and conduction drying machinery. During the drying process, heat is transferred from the inner wall of the drum to its outer wall, passing through the material being dried attached to the outer surface of the drum, evaporating the moisture from the material. It is a continuous drying production machine. Sludge with a certain moisture content is tumbled by the drum during the drying process.

[0003] Chinese patent CN116177842A discloses a rotary drum dryer for sludge. Wet sludge is fed into the rotating sleeve from the higher end, and hot air from a hot air blower enters through the air inlet. A drive unit rotates the rotating sleeve, and as the sleeve rotates, the wet sludge flows to the lower end under gravity, resulting in a counter-current contact between gas and solid within the sleeve. The hot air heats and dehumidifies the wet sludge, which is then discharged from the outlet. Before processing a batch of wet sludge, the tilt angle of the mounting base is adjusted according to the sludge's moisture content, thereby adjusting the tilt angle of the rotating sleeve. This allows for setting different heating and drying times for sludge with varying moisture levels, preventing incomplete drying or excessive drying times that lead to energy waste. Furthermore, in case of sludge blockage, the tilt angle of the rotating sleeve can be adjusted to its maximum, facilitating the rapid removal of blocked sludge without requiring machine shutdown, thus improving work efficiency. When using a lifter-type rotary drum dryer to dry sludge, the high viscosity of wet sludge makes it difficult to lift the sludge with the lifters and then sprinkle it down. Instead, the sludge rotates with the rotary drum and tends to clump together. Existing rotary drum dryers are not well suited for drying sludge, resulting in severe sludge clumping, blockages, disruption of continuous production, and low efficiency. Summary of the Invention

[0004] To address the aforementioned problems in the existing technology, this invention provides a sludge pre-carbonization rotary dryer, which can significantly improve the anti-caking ability of highly viscous sludge and ensure the uniformity and continuity of the drying process.

[0005] The technical solution of the present invention is as follows:

[0006] A sludge pre-carbonization rotary dryer includes a rotary drying cylinder, a flue gas inlet, and a flue gas outlet. It also includes an outer cylinder concentrically fitted around the rotary drying cylinder. The rotary drying cylinder has several holes, and a flue gas channel is formed between the outer cylinder and the rotary drying cylinder. The flue gas inlet is connected to the inner cavity of the rotary drying cylinder, and the flue gas outlet is connected to the inner cavity of the rotary drying cylinder. High-temperature flue gas flows simultaneously through both the flue gas channel and the inner cavity of the rotary drying cylinder, providing bidirectional heating to the cylinder wall.

[0007] The device also includes a mounting base, two fixed sleeves, a drive mechanism, and a drying structure. The two fixed sleeves are fixed on the mounting base, and the two ends of the outer cylinder are rotatably connected to the two fixed sleeves on the same axis. The drive mechanism is connected to the outer cylinder and is used to drive the outer cylinder to rotate. A discharge pipe is provided on the fixed sleeve near the flue gas inlet, and a feed pipe is provided on the fixed sleeve near the flue gas outlet.

[0008] The rotary drying cylinder has axially arranged base plates fixedly installed inside. Each base plate is rotatably connected to a movable scraper at its center. The movable scraper has a sphere at its end, and the base plate has a cavity in the center that matches the sphere. A torsion spring is installed between the top of the base plate and the back of the movable scraper, which pushes the leading edge of the movable scraper towards the center of the rotary drying cylinder under normal conditions. A heat-conducting cavity is formed inside the movable scraper, extending through the root of the movable scraper. The base plate has a through channel that connects to the flue gas passage.

[0009] The outer cylinder has multiple sets of heat dissipation fins welded to its inner wall. Each set of heat dissipation fins includes three rectangular metal plates arranged in parallel. A hemispherical metal block is welded between adjacent rectangular metal plates, and the bottom of the hemispherical metal block is in contact with the inner wall of the outer cylinder.

[0010] The rotary drying cylinder has multiple axially extending slide rails welded to its outer wall, with a counterweight slider slidably mounted on each slide rail. The channel is arranged axially along the rotary drying cylinder, and a through groove matching the channel is provided on the wall of the rotary drying cylinder. The counterweight slider is hinged to the ball at the end of the movable scraper via a connecting rod. The connecting rod includes an outer rod and an inner rod that are nested and slidably arranged, with a spring connecting the outer rod and the inner rod. Limiting blocks for limiting the movement range of the counterweight slider are provided at both ends of the slide rail.

[0011] The movable scraper surface is covered with a movable scale layer, which is composed of multiple fish-scale-shaped metal sheets; the upper end of each metal sheet is welded to the movable scraper surface, and the lower end hangs freely; the edges of adjacent metal sheets partially overlap and cover each other.

[0012] The rotary drying cylinder is coaxially fixed with an annular support, which is secured to the cylinder by six support bolts. Six sets of flow guiding units are evenly distributed along the circumference of the annular support. Each flow guiding unit includes a U-shaped fixed seat, a cylindrical rotating shaft, and a rectangular flow guiding plate. The bottom of the U-shaped fixed seat is fixed to the annular support. The cylindrical rotating shaft passes between the two side plates of the U-shaped fixed seat, and its ends are limited by retaining springs. The rectangular flow guiding plate is welded to the middle of the cylindrical rotating shaft and has a V-shaped groove structure. The rectangular flow guiding plate has evenly spaced strip-shaped air holes, with the length of each hole parallel to the axis of the rotary drying cylinder. A long rod is welded to one end of the cylindrical rotating shaft, with a connecting hole at the end. A linkage rod is vertically welded to the side of the counterweight slider, and the end of the linkage rod is connected to the long rod via a flexible metal hose. When the counterweight slider moves along the slide rail, the linkage rod and the metal hose drive the cylindrical rotating shaft to rotate, causing the rectangular flow guiding plate to deflect synchronously.

[0013] The outer cylinder is fixedly fitted with a gear ring, and the driving mechanism includes a driving gear and a driving motor. The driving gear meshes with the gear ring, and the driving motor is connected to the driving gear and is used to drive the driving gear to rotate.

[0014] The sludge pre-carbonization rotary dryer also includes a lifting mechanism, which includes a base. One end of the mounting base is hinged to the base, and a rotating motor is fixed on the base. The rotating motor is connected to a rotating disk, and a connecting rod is hinged to the edge of the rotating disk. The other end of the connecting rod is hinged to the other end of the mounting base.

[0015] The present invention has the following beneficial effects:

[0016] This invention achieves simultaneous penetration of high-temperature flue gas through the annular flue gas channel formed by the outer cylinder and the rotary drying cylinder, along with the cylinder wall holes, enabling the cylinder wall to receive bidirectional synchronous heating. This completely solves the problem of uneven heat conduction in the cylinder wall caused by single-sided heating in traditional equipment.

[0017] By combining the torsion spring reset mechanism of the movable scraper with the dynamic covering structure of the scale layer, the scraper can adaptively adjust its angle under material resistance. At the same time, the valve-type design of the scale layer effectively prevents fibrous materials from getting stuck, significantly improving the anti-caking ability of high-viscosity sludge.

[0018] The innovative design of the counterweight slider deflecting the guide plate through the flexible connection mechanism enables real-time matching of airflow distribution and material resistance changes, allowing high-temperature flue gas to be precisely focused on areas prone to agglomeration, fundamentally ensuring the uniformity and continuity of the drying process. Attached Figure Description

[0019] Figure 1This is a half-sectional view of the overall structure of the present invention;

[0020] Figure 2 This is a partial cross-sectional view of the movable scraper and base plate of the present invention;

[0021] Figure 3 This is a side view of the rotary drying cylinder and outer cylinder of the present invention;

[0022] Figure 4 This is a schematic diagram of the rectangular guide plate of the present invention.

[0023] The reference numerals in the figure are as follows:

[0024] 1. Mounting base; 2. Fixing sleeve; 3. Rotary drying cylinder; 4. Outer cylinder; 5. Flue gas inlet; 6. Annular support; 12. Base; 21. Discharge pipe; 22. Feed pipe; 23. Flue gas outlet; 31. Base plate; 32. Movable scraper; 33. Torsion spring; 34. Slide rail; 35. Counterweight slider; 36. Scale layer; 37. Hole; 41. Rectangular metal plate; 42. Hemispherical metal block; 43. Gear ring; 61. Support foot; 62. U-shaped fixing seat; 63. Cylindrical rotating shaft; 64. Rectangular guide plate; 65. Long rod; 66. Linkage rod; 67. Metal flexible hose; 111. Drive motor; 121. Rotating motor; 122. Rotating disk; 123. Connecting rod; 301. Through groove; 302. Connecting rod. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0026] Please see Figures 1 to 4 The invention provides a technical solution:

[0027] A sludge pre-carbonization rotary dryer includes a rotary drying cylinder 3, a flue gas inlet 5, and a flue gas outlet 23. It also includes an outer cylinder 4 concentrically fitted around the rotary drying cylinder 3. The rotary drying cylinder 3 has several holes 37, and a flue gas channel is formed between the outer cylinder 4 and the rotary drying cylinder 3. The flue gas inlet 5 is connected to the inner cavity of the rotary drying cylinder 3, and the flue gas outlet 23 is connected to the inner cavity of the rotary drying cylinder 3. High-temperature flue gas flows simultaneously through the flue gas channel and the inner cavity of the rotary drying cylinder 3, providing bidirectional heating to the cylinder wall. The dryer also includes a mounting base 1, two fixed sleeves 2, a drive mechanism, and a drying unit. Specifically, the outer cylinder 4 is fixedly fitted with a gear ring 43. The drive mechanism includes a drive gear and a drive motor 111. The drive gear meshes with the gear ring 43, and the drive motor 111 is connected to the drive gear and is used to drive the drive gear to rotate. The two fixed sleeves 2 are fixed on the mounting base 1, and the two ends of the outer cylinder 4 are respectively coaxially rotatably connected to the two fixed sleeves 2. The drive mechanism is connected to the outer cylinder 4 and is used to drive the outer cylinder 4 to rotate. A discharge pipe 21 is opened on the fixed sleeve 2 near the flue gas inlet 5, and a feed pipe 22 is opened on the fixed sleeve 2 near the flue gas outlet 23.

[0028] The sludge pre-carbonization rotary dryer also includes a lifting mechanism, which includes a base 12. One end of the mounting base 1 is hinged to the base 12. A rotary motor 121 is fixed on the base 12. The rotary motor 121 is connected to a rotating disk 122. A connecting rod 123 is hinged to the edge of the rotating disk 122. The other end of the connecting rod 123 is hinged to the other end of the mounting base 1.

[0029] It is worth mentioning that the fixed sleeve 2 near the flue gas outlet 23 is located on the mounting base 1 near the rotating motor 121, while the fixed sleeve 2 near the flue gas inlet 5 is located on the side where the mounting base 1 and the base 12 are hinged. That is, the side where the mounting base 1 and the base 12 are hinged is in a lower position relative to the other side. The flue gas inlet 5 is set at a lower position, so that the flue gas can drift upward from the flue gas inlet 5, that is, towards the flue gas outlet 23. At the same time, the sludge is poured into the feed pipe 22 at a higher position, so that the sludge can roll down towards the discharge pipe 21 under its own weight, reducing the possibility of sludge residue. At the same time, the falling direction of the sludge is opposite to the drifting direction of the flue gas, so that the sludge can be more fully dried by the high temperature flue gas. In addition, the high temperature flue gas will also seep into the flue gas channel through the hole 37, so that the rotary drying cylinder 3 in the inner cavity can continuously maintain a higher temperature heating environment.

[0030] As a preferred embodiment, the end of the flue gas inlet 5 is connected to the inner cavity of the rotary drying cylinder 3. The surface of the flue gas inlet 5 is also provided with branch through-holes for introducing high-temperature gas into the flue gas channel. This arrangement aims to divide the high-temperature flue gas into two input paths: one is that the high-temperature flue gas directly enters the inner cavity of the rotary drying cylinder 3 from the flue gas inlet 5, directly contacting and heating the material; the other is that the flue gas simultaneously enters the flue gas channel between the outer cylinder 4 and the rotary drying cylinder 3, and permeates through the holes 37 on the wall of the rotary drying cylinder 3. The flue gas enters the inner cavity of the rotary drying cylinder 3 and is finally discharged from the flue gas outlet 23 after merging. When the high-temperature flue gas flows through the inner cavity of the rotary drying cylinder 3 and the flue gas channel, heat is simultaneously conducted from the inner and outer walls of the rotary drying cylinder 3. Through the holes 37 in the cylinder wall of the rotary drying cylinder 3, the flue gas in the flue gas channel will penetrate the cylinder wall of the rotary drying cylinder 3 laterally and enter the interior. This process further enhances the overall heat transfer efficiency of the cylinder wall of the rotary drying cylinder 3. Finally, the bidirectional heat flow is superimposed in the cylinder wall of the rotary drying cylinder 3, realizing the efficient drying and carbonization of the material.

[0031] Simultaneously, the drive mechanism rotates the outer cylinder 4 and the nested rotary drying cylinder 3 as a whole, causing the material inside the cylinder to continuously tumble. The presence of the flue gas channel ensures that the outer wall of the rotary drying cylinder 3 is in continuous contact with high-temperature flue gas, while the holes 37 in the cylinder wall allow external heat flow to actively penetrate the cylinder wall and enter the inner cavity, working together with the directly injected flue gas inside the cavity. This structure completely changes the limitation of traditional drying cylinders being heated on one side, making the cylinder wall a highly efficient medium for conducting heat in both directions, significantly improving thermal energy utilization and reducing the risk of coking. A base plate 31 arranged axially is fixedly installed inside the rotary drying cylinder 3; a movable scraper 32 is rotatably connected to the middle of each base plate 31, and a ball is provided at the end of the movable scraper 32. A cavity matching the ball is provided in the middle of the base plate 31; a torsion spring 33 is installed between the top of the base plate 31 and the back of the movable scraper 32, which pushes the leading edge of the movable scraper 32 to tilt towards the center of the rotary drying cylinder 3 under normal conditions; a heat conduction cavity is formed inside the movable scraper 32, and the heat conduction cavity extends through the root of the movable scraper 32; a channel is provided through the base plate 31, and the channel is connected to the flue gas passage;

[0032] Inside the rotary drying cylinder 3, axially arranged base plates 31 are fixed to the cylinder wall as the core support structure. Each base plate 31 is rotatably connected to the ball at the end of the movable scraper 32 through a central cavity, forming a dynamically adjustable scraping mechanism. Under normal conditions, the torsion spring 33 pushes the leading edge of the movable scraper 32 to tilt towards the center of the cylinder, so that the movable scraper 32 remains in close contact with the material layer when the rotary drying cylinder 3 rotates. When the rotary drying cylinder 3 rotates, the material tumbles, and the movable scraper 32 can swing slightly against the torsion spring 33 under the resistance of the material, preventing hard materials from getting stuck. At the same time, the restoring force of the torsion spring 33 ensures that the movable scraper 32 continuously scrapes the cylinder wall of the rotary drying cylinder 3, breaking up material agglomerates.

[0033] Preferably, the movable scraper 32 has a heat-conducting cavity inside, which extends to the root of the movable scraper 32; at the same time, the base plate 31 has a channel that connects to the external flue gas channel; the high-temperature flue gas is introduced into the heat-conducting cavity of the movable scraper 32 through the channel, so that the movable scraper 32 directly heats the wet sludge in contact with it.

[0034] Multiple sets of heat dissipation fins are welded to the inner wall of the outer cylinder 4. Each set of heat dissipation fins includes three parallel rectangular metal plates 41. A hemispherical metal block 42 is welded between adjacent rectangular metal plates 41. The bottom of the hemispherical metal block 42 contacts the inner wall of the outer cylinder 4. The hemispherical metal block 42 disrupts the laminar boundary layer of flue gas between the rectangular metal plates 41. At the same time, the rectangular metal plates 41 significantly increase the heat exchange area, so that the heat of flue gas in the flue gas channel can be quickly transferred to the entire wall surface of the outer cylinder 4, avoiding local overheating. Specifically, when the flue gas passes through, it will be ejected from the flue gas channel and the hole 37 at the same time. Then, when the flue gas encounters the hemispherical metal block 42, it will be dispersed and drift in different directions, which can diffuse the flue gas, prolong the residence time of the flue gas in the cylinder, and increase the temperature of the cylinder wall.

[0035] Multiple axially extending slide rails 34 are welded to the outer wall of the rotary drying cylinder 3, and a counterweight slider 35 is slidably installed on each slide rail 34. A channel is arranged along the axial direction of the rotary drying cylinder 3, and a through groove 301 matching the channel is provided on the wall surface of the rotary drying cylinder 3. The counterweight slider 35 is hinged to the ball at the end of the movable scraper 32 via a connecting rod 302. The connecting rod 302 includes an outer rod and an inner rod that are nested and slidably arranged, with a spring connecting the outer rod and the inner rod. Limiting blocks are provided at both ends of the slide rail 34 to limit the movement range of the counterweight slider 35. When sludge adheres and causes the movable scraper 32 to be obstructed and deflected, the resistance is transmitted to the connecting rod 302 through the ball. The spring connecting the outer rod and the inner rod serves to compress and buffer the impact force, and also extends and moves in coordination with the counterweight slider 35 when the counterweight slider 35 is continuously pulled along the slide rail 34 by continuous resistance. Simultaneously, it works with the spring to reset the movable scraper 32 when it is not under force.

[0036] The surface of the movable scraper 32 is covered with a movable scale layer 36, which is composed of multiple fish-scale-shaped metal sheets. The upper end of each metal sheet is welded to the surface of the movable scraper 32, and the lower end hangs freely. The edges of adjacent metal sheets partially overlap. The edges of adjacent fish-scale-shaped metal sheets overlap by 30%. When the movable scraper 32 pushes forward, the scale layer 36 adheres to the surface and scrapes away the sludge. When the movable scraper 32 retracts, the hanging ends of the fish-scale-shaped metal sheets are lifted by the sludge, allowing large particles to slide off. The overlapping area of ​​the fish-scale-shaped metal sheets forms micro gaps, and the stuck sludge clumps are sheared and broken up between the opening and closing of the fish-scale-shaped metal sheets, completing the self-cleaning process.

[0037] An annular support 6 is coaxially fixed inside the rotary drying cylinder 3. The annular support 6 is fixed to the rotary drying cylinder 3 by six support feet 61 bolts. Six sets of flow guiding units are evenly distributed along the circumference of the annular support 6. Each set of flow guiding units includes a U-shaped fixing seat 62, a cylindrical rotating shaft 63, and a rectangular flow guiding plate 64. The bottom of the U-shaped fixing seat 62 is fixed to the annular support 6. The cylindrical rotating shaft 63 passes between the two side plates of the U-shaped fixing seat 62, and the two ends of the cylindrical rotating shaft 63 are provided with retaining springs for limiting. The rectangular flow guiding plate 64 is welded to the middle of the cylindrical rotating shaft 63, and the rectangular flow guiding plate 64 is provided with a V-shaped groove structure. The surface of the rectangular flow guiding plate 64 is evenly opened with strip-shaped air holes, and the length direction of each strip-shaped air hole is parallel to the axis of the rotary drying cylinder 3. A long rod 65 is welded to one end of the cylindrical rotating shaft 63, and the end of the long rod 65 is opened. A connecting hole is provided, and a linkage rod 66 is vertically welded to the side of the counterweight slider 35. The end of the linkage rod 66 is connected to the long rod 65 through a flexible metal hose 67. When the counterweight slider 35 moves along the slide rail 34, the linkage rod 66 and the metal hose 67 drive the cylindrical rotating shaft 63 to rotate, causing the rectangular guide plate 64 to deflect at the same angle. When the counterweight slider 35 moves along the slide rail 34, the linkage rod 66 on its side drives the long rod 65 through the flexible metal hose 67. The flexible metal hose 67 converts the linear displacement of the counterweight slider 35 into the rotational torque of the cylindrical rotating shaft 63, causing the rectangular guide plate 64 to deflect at the same angle in real time. This allows for more effective direct blowing of sludge. The V-shaped groove divides the main flue gas jet, forming multiple turbulent flows to enhance heat mixing. The strip-shaped air holes allow some airflow to penetrate radially, preventing sludge from accumulating on the back of the rectangular guide plate 64.

[0038] It is worth mentioning that, in addition to the flexible metal hose 67 form of this embodiment, the problem of "deformation and jamming of rigid transmission mechanism" is solved. Therefore, the flexible transmission unit is not limited to metal hose, and other solutions such as universal joint hinge, carbon fiber cable or magnetic coupler can also be used, as long as the deformation requirements of this application are met.

[0039] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A sludge pre-carbonization rotary dryer, comprising a rotary drying cylinder (3), a flue gas inlet (5), and a flue gas outlet (23), characterized in that: It also includes an outer cylinder (4) concentrically fitted outside the rotary drying cylinder (3), the rotary drying cylinder (3) having several holes (37) formed thereon, and a flue gas passage formed between the outer cylinder (4) and the rotary drying cylinder (3); the flue gas inlet (5) is connected to the inner cavity of the rotary drying cylinder (3), and the flue gas outlet (23) is connected to the inner cavity of the rotary drying cylinder (3); the cylinder wall of the rotary drying cylinder (3) is heated bidirectionally by the high-temperature flue gas flowing through both the flue gas passage and the inner cavity of the rotary drying cylinder (3); and an axially arranged base plate (31) is fixedly installed inside the rotary drying cylinder (3). Each base plate (31) is rotatably connected to a movable scraper (32) at its center. The movable scraper (32) has a sphere at its end, and the base plate (31) has a cavity in the center that matches the sphere. A torsion spring (33) is installed between the top of the base plate (31) and the back of the movable scraper (32), which pushes the leading edge of the movable scraper (32) toward the center of the rotary drying cylinder (3) under normal conditions. A heat-conducting cavity is formed inside the movable scraper (32), and the heat-conducting cavity extends through the root of the movable scraper (32). The base plate (31) is provided with a through channel that connects to the flue gas passage. Multiple sets of heat dissipation fins are welded to the inner wall of the cylinder (4). Each set of heat dissipation fins includes three parallel rectangular metal plates (41). A hemispherical metal block (42) is welded between adjacent rectangular metal plates (41). The bottom of the hemispherical metal block (42) contacts the inner wall of the outer cylinder (4). Multiple axially extending slide rails (34) are welded to the outer wall of the rotary drying cylinder (3). A counterweight slider (35) is slidably installed on each slide rail (34). The channel is arranged axially along the rotary drying cylinder (3). A through groove (301) matching the channel is provided on the wall surface of the rotary drying cylinder (3). The counterweight slider (35) is slidably installed on each slide rail (34). 5) The connecting rod (302) is hinged to the ball at the end of the movable scraper (32). The connecting rod (302) includes an outer rod and an inner rod that are nested and slidably arranged. A spring is connected between the outer rod and the inner rod. The slide rail (34) is provided with limiting blocks at both ends to limit the movement range of the counterweight slider (35). The surface of the movable scraper (32) is covered with a movable scale layer (36), which is composed of multiple fish-scale-shaped metal sheets. The upper end of each metal sheet is welded to the surface of the movable scraper (32), and the lower end hangs freely. The edges of adjacent metal sheets overlap and cover each other.

2. The sludge pre-carbonization rotary dryer as described in claim 1, characterized in that: It also includes a mounting base (1), two fixed sleeves (2), a drive mechanism and a drying structure. The two fixed sleeves (2) are fixed on the mounting base (1), and the two ends of the outer cylinder (4) are coaxially rotatably connected to the two fixed sleeves (2). The drive mechanism is connected to the outer cylinder (4) and is used to drive the outer cylinder (4) to rotate. A discharge pipe (21) is provided on the fixed sleeve (2) near the flue gas inlet (5), and a feed pipe (22) is provided on the fixed sleeve (2) near the flue gas outlet (23).

3. The sludge pre-carbonization rotary dryer as described in claim 2, characterized in that: An annular bracket (6) is coaxially fixed inside the rotary drying cylinder (3). The annular bracket (6) is fixed to the rotary drying cylinder (3) by six support legs (61) bolts. Six sets of flow guiding units are evenly distributed on the annular bracket (6) along the circumferential direction. Each set of flow guiding units includes a U-shaped fixing seat (62), a cylindrical rotating shaft (63), and a rectangular guide plate (64). The bottom of the U-shaped fixing seat (62) is fixed to the annular bracket (6). The cylindrical rotating shaft (63) passes between the two side plates of the U-shaped fixing seat (62). The cylindrical rotating shaft (63) is provided with retaining springs at both ends. The rectangular guide plate (64) is welded to the middle of the cylindrical rotating shaft (63). The flow plate (64) is provided with a V-shaped groove structure; the rectangular flow guide plate (64) has strip-shaped air holes evenly opened on its surface, and the length direction of each strip-shaped air hole is parallel to the axis of the rotary drying cylinder (3); a long rod (65) is welded to one end of the cylindrical rotating shaft (63), and a connecting hole is opened at the end of the long rod (65). A linkage rod (66) is vertically welded to the side of the counterweight slider (35), and the end of the linkage rod (66) is connected to the long rod (65) through a flexible metal hose (67). When the counterweight slider (35) moves along the slide rail (34), the cylindrical rotating shaft (63) is driven to rotate through the linkage rod (66) and the metal hose (67), so that the rectangular flow guide plate (64) deflects synchronously.

4. The sludge pre-carbonization rotary dryer as described in claim 2, characterized in that: A gear ring (43) is fixedly sleeved on the outer cylinder (4). The driving mechanism includes a driving gear and a driving motor (111). The driving gear meshes with the gear ring (43). The driving motor (111) is connected to the driving gear and is used to drive the driving gear to rotate.

5. A sludge pre-carbonization rotary dryer as described in claim 2, characterized in that: The sludge pre-carbonization rotary dryer also includes a lifting mechanism, which includes a base (12). One end of the mounting seat (1) is hinged to the base (12). A rotating motor (121) is fixed on the base (12). The rotating motor (121) is connected to a rotating disk (122). A connecting rod (123) is hinged to the edge of the rotating disk (122). The other end of the connecting rod (123) is hinged to the other end of the mounting seat (1).

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