Low-temperature drying and medium-temperature carbonization linkage device and method for sludge

Abstract

The invention discloses a low-temperature drying and medium-temperature carbonization linkage device and method for sludge, relates to the technical field of sludge treatment, and is used for solving the problems that additional sludge granulation is needed, a carbonization process cannot be quickly carried out after sludge drying, and the overall efficiency of sludge treatment is reduced. According to the invention, the drying tank and the rotary kiln for sludge use are arranged on the implantation bed, heat generated during preheating and temperature rising of the rotary kiln is used for guiding and replacing, high-temperature airflow is discharged into the drying tank under the work of the material control box and the heat exchanger, and then the sludge is extruded and discharged into the turnover drying cylinder through the rotation of the fan blades in the material rolling cylinder. And finally, the overturning drying cylinder is adjusted and driven to rotate through the material jacking mechanism and shakes left and right at the same time, and when holes in the outer cover of the rotary disc are overlapped, automatic discharging is carried out, so that the formed and dried sludge falls into the drying tank and enters the rotary kiln along the slag outlet. And performing subsequent sludge carbonization treatment on the rotary kiln which rotates along with the completion of the temperature rise.

Description

Technical Field

[0001] The invention relates to the technical field of sludge treatment, and in particular to a sludge low-temperature drying and medium-temperature carbonization linkage device and method. Background Art

[0002] The sludge low-temperature drying equipment mainly uses a closed hot air circulation condensation process to dry the sludge at low temperature, effectively improving the drying efficiency and reducing energy consumption. At the same time, it uses heat pump heating technology, heat recovery technology and gradient heating and cooling technology to achieve stabilization, harmlessness and reduction of sludge. The sludge carbonization technology is to heat and pressurize the sludge in the carbonization equipment under anaerobic or micro-aerobic conditions to "dry flow" the sludge, so that the cells in the sludge are lysed to release the water, while retaining the carbon value in the sludge to the maximum extent. The organic matter in the sludge is stable after carbonization and can be widely used for adsorption and deodorization, sewage filtration, environmentally friendly snow melting agent, fuel, soil improvement and activated carbon, etc. Usually, sludge needs to be dried in the early stage of carbonization to control the moisture content in the sludge again. Oil, reaction water (steam condensate), biogas (uncondensed air) and solid carbonized products are produced in the process, which can achieve sludge reduction and resource utilization. Then, the sludge is transferred to the sludge carbonization workshop to start pyrolysis, remove the remaining water in the sludge, and then transform it into carbon particles. In this case, sludge granulation must be carried out in the early stage of the process to facilitate rapid sludge heating, transfer and later use. At the same time, sludge drying and carbonization equipment are mostly carried out in steps, which can easily lead to a decrease in the overall sludge treatment rate. To this end, we propose a sludge low-temperature drying and medium-temperature carbonization linkage device and method. Summary of the invention

[0003] The purpose of the present invention is to provide a sludge low-temperature drying and medium-temperature carbonization linkage device and method to solve the problem proposed in the above background technology that additional sludge granulation is required and the carbonization process cannot be quickly performed after the sludge is dried, resulting in a decrease in the overall efficiency of sludge treatment.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a sludge low-temperature drying and medium-temperature carbonization linkage device, comprising a bed and a placement frame, the top of the bed is fixed with a placement frame by bolts, a drying tank is fixedly connected to the placement frame by a bracket, a turntable is movably connected to the drying tank, a central axis of one side of the turntable passes through one side of the drying tank and is sleeved and fixed with a movable disk, an abutment column is symmetrically fixed to one side of the turntable by spot welding, and a flip drying cylinder is slidably connected to the abutment column in the drying tank; A slag outlet is provided at the bottom of the rotary drying cylinder, a material control box is connected and fixed on one side of the slag outlet and located on the placement rack, a heat exchanger is installed on one side of the material control box, a connecting pipe is connected to the bottom of the material control box, a rotary kiln is movably connected to the top of the implantation bed and located on one side of the connecting pipe, a slag discharge box is installed on one side of the implantation bed, and the slag discharge box is movably connected to one side of the rotary kiln.

[0005] Furthermore, a coil drum is fixedly connected to the placement rack and located on one side of the drying tank, one side of the coil drum respectively penetrates the turntable and the flip drying cylinder and is movably connected to the inner wall of the drying tank, a sludge sleeve is movably provided on the flip drying cylinder and located on the outer wall of the coil drum, holes are evenly opened on the outer wall of the coil drum on the sludge sleeve side, and a coil fan blade is installed in the coil drum and is connected to the output end of the motor on the placement rack.

[0006] Furthermore, the turntable side cover is in contact with the outer wall of the flip drying cylinder, the turntable side cover and the holes on the flip drying cylinder are arranged alternately, and a return spring is installed on the opposite surface of the turntable and the flip drying cylinder and located on the outer wall of the winding cylinder.

[0007] Furthermore, a material pushing mechanism is installed on the inner wall of the drying tank, and the material pushing mechanism includes an air cavity, a piston disk and a push column. An air cavity is fixed to the inner wall of one side of the drying tank by bolts, and a piston disk is slidably connected in the air cavity. A push column is fixedly connected to one side of the piston disk, one end of the push column passes through one side of the air cavity and extends into the drying tank, and one side of the air cavity is connected to a ventilation pipe.

[0008] Furthermore, the inner wall of the drying tank is rotatably connected to a limiting sleeve through a bearing, one end of the top column abuts against one side of the limiting sleeve, and a protrusion on one side of the flip drying cylinder abuts against the other side of the limiting sleeve.

[0009] Furthermore, a sealing body is movably connected in the material control box, and a through groove is provided on the sealing body, one side of the through groove is connected to the slag outlet, and the other side of the through groove is connected to the connecting pipe.

[0010] Furthermore, a heat preservation pipe is fixedly connected to one side of the heat exchanger, and the other end of the heat preservation pipe passes through the drying tank and is connected to the coil drum.

[0011] The linkage method of low-temperature drying and medium-temperature carbonization of sludge is: Drum preheating and drying, the rotary kiln is heated in advance, and the sealing body in the material control box is turned so that the through groove of the sealing body faces the connecting pipe and the heat exchanger. The air in the rotary kiln is heated by preheating, and the hot air flows into the heat exchanger along the sealing body. The high-temperature gas heats the water in the heat exchanger, and the gasified air heats the air around the heat exchanger. Then the air is heated to 80°C and blown into the drying tank along the insulation pipe through the blower; The high-temperature airflow is discharged into the rotating drying cylinder along the air holes on the roll drum, and then the sludge is discharged into the roll drum from the side of the feed pipe. The rotating fan blades continuously push the sludge to move, and finally it is squeezed out from the side of the sludge sleeve and falls into the rotating drying cylinder. At the same time, the rotating movable disk drives the turntable to rotate, so that the entire rotating drying cylinder drives the strip sludge to rotate and dry; The discharge material is carbonized at high temperature. The pressure in the air cavity is increased by exhausting air into the vent pipe. The piston disc pushes the top column to contact the limit sleeve. The limit sleeve rotates while changing the rotation trajectory of the flip drying cylinder, so that the holes on the turntable cover overlap with the holes on the flip drying cylinder, and the strip sludge is cut off and then discharged into the bottom of the drying tank, and finally discharged into the material control box along the slag outlet. The sealing block rotated in advance makes the through groove face the connecting pipe and the drying tank, and then the sludge enters the rotary kiln along the connecting pipe. During the rotation, it is heated to 850℃ for carbonization treatment, and the carbonized sludge is finally discharged from the slag box side.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, the drying tank and the rotary kiln used for the sludge are arranged on the implantation bed, and the heat generated during the preheating of the rotary kiln is used for guided replacement, and the high-temperature airflow is discharged into the drying tank under the operation of the material control box and the heat exchanger to create a drying environment, and then the sludge is squeezed and discharged into the flip drying cylinder by the rotation of the fan blades in the winding cylinder, and the sludge sleeve limits the shape of the sludge when it is extruded, so that the sludge is heated and dried. The sludge is quickly dried with the rotation of the flip drying cylinder, and finally the top material mechanism is adjusted to drive the flip drying cylinder to rotate and shake left and right at the same time, and when the holes of the turntable cover overlap, the material is automatically discharged, so that the shaped and dried sludge falls into the drying tank, and finally enters the rotary kiln along the slag outlet, and the rotary kiln that is heated and rotated is used for subsequent sludge carbonization treatment, so as to realize energy recovery and utilization, and accelerate the entire sludge process from drying to carbonization, thereby improving the overall sludge treatment efficiency; 2. In the present invention, the air pressure of the air cavity is controlled by the vent pipe, and the limit sleeve is driven to rotate while the rotary drying cylinder is rotated to crush the sludge in the cylinder, thereby avoiding the uneven carbonization of the sludge particles entering the rotary kiln later; 3. In the present invention, the high-temperature gas is intercepted and accurately transported by controlling the rotation of the sealing body in the material control box, thereby preventing the gradually rising temperature of the airflow from causing the sludge to be excessively dehydrated in the drying tank too early, thereby affecting the overall carbonization uniformity of the sludge in the subsequent rotary kiln. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the overall structure of the low-temperature drying and medium-temperature carbonization linkage device of the present invention; Figure 2 This is a schematic diagram of the connection structure between the drying tank and the coil drum of the present invention; Figure 3This is a schematic diagram of the main cross-sectional structure of the drying tank of the present invention; Figure 4 It is a schematic diagram of the overall structure of the ejecting mechanism of the present invention; Figure 5 This is a schematic diagram of the structure of the sludge being discharged into the connecting pipe after drying in the present invention; Figure 6 This is a schematic diagram of the structure of the rotary kiln preheating airflow discharged into the heat exchanger of the present invention.

[0014] In the figure: 1. implantation; 2. placement rack; 3. drying tank; 4. winding drum; 5. feeding pipe; 6. movable plate; 7. turntable; 8. abutment column; 9. flip drying drum; 10. reset spring; 11. sludge sleeve; 12. material pushing mechanism; 121. air cavity; 122. piston plate; 123. push column; 124. ventilation pipe; 13. slag outlet; 14. limit sleeve; 15. insulation pipe; 16. material control box; 17. sealing body; 18. through groove; 19. heat exchanger; 20. connecting pipe; 21. rotary kiln; 22. slag discharge box. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] See also Figure 1-6 , the present invention provides a technical solution: Sludge is solid waste generated during sewage treatment. It has the characteristics of high moisture, high organic matter and high nutrition, causing serious pollution to the environment. Traditional sludge treatment methods mainly include landfill incineration and composting. Before subsequent sludge treatment, the moisture content in the sludge is controlled. like Figure 1 and Figure 2 As shown, the sludge is dehydrated by centrifugation or filter pressing in advance, and is discharged from the feed pipe 5 on the side of the drying tank 3 on the placement rack 2. A sludge moving fan blade is arranged in the winding drum 4 connected to the drying tank 3. The fan blade is driven by a motor to rotate to move the sludge discharged from the feed pipe 5 into the drying tank 3. At the same time, a movable disk 6 is movably connected to the outside of the drying tank 3, and is also rotated by the belt driven by the rotation of the motor; like Figure 3As shown, one side of the entire coil drum 4 is fixed to the inner wall of the drying tank 3, and the fan blades located inside the coil drum 4 are movably connected, the movable disc 6 is located inside the drying tank 3 and is connected to a turntable 7, and a symmetrically fixed abutment column 8 on the side of the turntable 7 is slidably sleeved with a flip drying barrel 9, and at the same time, the outer cover of the turntable 7 abuts against the flip drying barrel 9, and holes are opened between the two, and are alternately arranged, so that the sludge in the flip drying barrel 9 cannot be discharged normally, and when the flip drying barrel 9 and the outer cover of the turntable 7 are deflected and misaligned, the sludge can be discharged from the flip drying barrel 9 through the overlapping holes between the two; Usually, the sludge drying rate is accelerated to realize the sludge granulation treatment and increase the contact area between the sludge and the heating component. However, the present invention utilizes the rotation of the fan blades to drive the sludge to move and intercepts the sludge during the movement process, so that the sludge is squeezed and discharged from the side of the sludge sleeve 11. The sludge squeezed into strips is continuously discharged from the side holes of the winding drum 4 and the sludge sleeve 11 and enters the flip drying drum 9. At the same time, the other side of the coiling drum 4 is connected with an insulation pipe 15, and the rotary kiln 21 is used to generate heat later, and the heated air enters the coiling drum 4 along the insulation pipe 15, and finally completes the heating of the entire flip drying drum 9. The drying temperature of the entire sludge in the flip drying drum 9 is usually controlled to be 80°C. At the same time, the motor drives the movable disk 6 to rotate, and the flip drying drum 9 on the turntable 7 rotates at the same time, and the sludge in the flip drying drum 9 is continuously flipped and the subsequent drying and dehydration work is completed; like Figure 5 As shown, a material control box 16 is connected to the slag outlet 13 at the bottom of the drying tank 3, and a sealing body 17 is movably connected in the material control box 16. The sealing body 17 is a sphere as a whole, and a "T"-shaped through groove 18 begins to be formed in the sphere. The sealing body 17 is driven to rotate by the rotation of the motor to change the direction of the through groove 18 of the entire sealing body 17; When heat transfer is required, the hot air in the rotary kiln 21 flows along the connecting pipe 20 to the material control box 16. Figure 6 As shown, at this time, the through groove 18 of the sealing body 17 faces rightward and downward, and the high-temperature gas is discharged into the heat exchanger 19 along the material control box 16; The water is first heated in the heat exchanger 19, and the high-temperature steam generated heats the air in the heat exchanger 19 along the pipeline, and then the heated air is sent into the rotary drying cylinder 9 along the insulation pipe 15 by the blower to heat and dry the sludge; When the sludge drying is completed, a large amount of dried sludge is stored in the turning drying cylinder 9 to be discharged, and the lifting mechanism 12 in the drying tank 3 is controlled to work, such as Figure 4As shown, the main body of the entire ejection mechanism 12 is an air cavity 121, in which a piston disc 122 is slidably connected, one side of the piston disc 122 is fixedly connected to an ejection column 123 that penetrates through the air cavity 121 and abuts against a limit sleeve 14 rotating in the drying tank 3, and at the same time, a protrusion located on the side of the flip drying cylinder 9 abuts against the other side of the limit sleeve 14; When the flip drying cylinder 9 rotates normally, the protrusion on the flip drying cylinder 9 contacts the vertical limit sleeve 14 and rotates smoothly. When the air intake of the vent pipe 124 on the other side of the air cavity 121 changes the unilateral pressure of the entire air cavity 121, the entire piston disc 122 is pushed to move while pushing the limit sleeve 14 to rotate clockwise by a certain angle. Accompanied by the flip drying cylinder 9 squeezing the unilateral return spring 10, the entire flip drying cylinder 9 will slide left and right on the coiling cylinder 4 due to the push of the return spring 10 when rotating. The flip drying cylinder 9 slides left and right, causing it to overlap with the holes on the cover of the turntable 7. Sludge strips that have been dried continuously fall along the holes to the bottom of the drying tank 3. At the same time, the flip drying cylinder 9 can also complete the crushing of long sludge strips by moving left and right, ensuring that the particles between the sludge are uniform. With the flip drying cylinder 9 moving left and right, the dried sludge is discharged into the material control box 16 along the slag outlet 13 at the bottom of the drying tank 3. Before discharging, the motor drives the entire sealing body 17 to rotate in the material control box 16, so that the through groove 18 faces the upper and lower sides. At this time, the sludge falling from the slag outlet 13 will enter the connecting pipe 20 along the through groove 18, and the connecting pipe 20 side is movably connected with a rotary kiln 21, and then the sludge rolls into the rotary kiln 21 for high-temperature carbonization treatment; The drying tank 3 and the rotary kiln 21 used for the sludge are arranged on the implantation bed 1, and the heat generated by the preheating of the rotary kiln 21 is used for the guided replacement, and the high-temperature airflow is discharged into the drying tank 3 under the operation of the material control box 16 and the heat exchanger 19 to create a drying environment, and then the sludge is squeezed and discharged into the flip drying cylinder 9 by the rotation of the fan blades in the winding cylinder 4. The sludge sleeve 11 limits the shape of the sludge when it is extruded, so that the sludge is heated and dried. The area, which is then dried by the heat, is increased, and the flip drying cylinder 9 rotates to achieve rapid drying of the sludge; Finally, the top material mechanism 12 is adjusted to drive the turning drying cylinder 9 to rotate and shake left and right at the same time, and when the holes of the outer cover of the turntable 7 overlap, the material is automatically discharged, so that the formed and dried sludge falls into the drying tank 3, and finally enters the rotary kiln 21 through the slag outlet 13. The rotary kiln 21 that rotates with the completion of heating is used for subsequent sludge carbonization treatment, so as to realize energy recovery and utilization, and accelerate the entire sludge drying to carbonization process, thereby improving the overall sludge treatment efficiency; like Figure 1As shown, the rotary kiln 21 is located on the implantation bed 1 and connected to the slag box 22. The high temperature generated by the flamethrower on the side of the slag box 22 passes through the rotary kiln 21 and reaches the connecting pipe 20. As the rotary kiln 21 rotates, the sludge blocks in the rolling process are continuously heated and dehydrated. The carbonization temperature is controlled at 850°C, and finally the carbonized sludge is discharged from the side of the slag box 22, completing the sludge drying and carbonization combined treatment.

[0017] The working process and principle of the present invention are as follows: Drum preheating drying, the rotary kiln 21 is heated in advance, and the sealing body 17 in the material control box 16 is turned so that the through groove 18 of the sealing body 17 faces the connecting pipe 20 and the heat exchanger 19, and the air in the rotary kiln 21 is preheated. The hot air flows along the sealing body 17 into the heat exchanger 19, and the high-temperature gas heats the water in the heat exchanger 19. At the same time, the gasified air heats the air around the heat exchanger 19, and then the air is heated to 80°C and blown into the drying tank 3 along the insulation pipe 15 through the blower; The high-temperature airflow is discharged into the rotating drying cylinder 9 along the air holes on the winding cylinder 4, and then the sludge is discharged into the winding cylinder 4 from the side of the feeding pipe 5. The rotating fan blades continuously push the sludge to move, and finally it is squeezed out from the side of the sludge sleeve 11 and falls into the rotating drying cylinder 9. At the same time, the rotating movable disk 6 drives the rotating disk 7 to rotate, so that the entire rotating drying cylinder 9 drives the strip sludge to rotate and dry; The discharge material is carbonized at high temperature. The pressure in the air cavity 121 is increased by exhausting air into the vent pipe 124. The piston disc 122 pushes the top column 123 to contact the limit sleeve 14. The limit sleeve 14 rotates while changing the rotation trajectory of the flip drying cylinder 9, so that the holes on the outer cover of the turntable 7 overlap with the holes on the flip drying cylinder 9, and the strip sludge is cut off and then discharged into the bottom of the drying tank 3, and finally discharged into the material control box 16 along the slag outlet 13. The sealing block rotated in advance makes the through groove 18 face the connecting pipe 20 and the drying tank 3, and then the sludge enters the rotary kiln 21 along the connecting pipe 20. During the rotation, it is heated to 850°C for carbonization treatment, and the carbonized sludge is finally discharged from the side of the slag box 22.

[0018] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

[0019] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0020] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A sludge low-temperature drying and medium-temperature carbonization linkage device, comprising a bed (1) and a placement frame (2), wherein the top of the bed (1) is fixed with the placement frame (2) by bolts, characterized in that: The placement rack (2) is fixedly connected to a drying tank (3) via a bracket, a rotating disk (7) is movably connected to the drying tank (3), a central axis on one side of the rotating disk (7) passes through one side of the drying tank (3) and is sleeved and fixed with a movable disk (6), an abutment column (8) is symmetrically fixed to one side of the rotating disk (7) by spot welding, and a flip drying cylinder (9) is slidably connected to the abutment column (8) in the drying tank (3); A slag outlet (13) is provided at the bottom of the rotary drying cylinder (9); a material control box (16) is connected and fixed to one side of the slag outlet (13) and is located on the placement frame (2); a heat exchanger (19) is installed on one side of the material control box (16); a connecting pipe (20) is connected to the bottom of the material control box (16); a rotary kiln (21) is movably connected to the top of the implantation bed (1) and is located on one side of the connecting pipe (20); a slag discharge box (22) is installed on one side of the implantation bed (1), and the slag discharge box (22) is movably connected to one side of the rotary kiln (21).

2. The sludge low-temperature drying and medium-temperature carbonization linkage device according to claim 1 is characterized in that: A coil drum (4) is fixedly connected to the placement rack (2) and located on one side of the drying tank (3); one side of the coil drum (4) passes through the turntable (7) and the flip drying cylinder (9) respectively and is movably connected to the inner wall of the drying tank (3); a sludge sleeve (11) is movably sleeved on the outer wall of the flip drying cylinder (9) and located on the outer wall of the coil drum (4); holes are evenly opened on the outer wall of the coil drum (4) on the side of the sludge sleeve (11); a coil fan blade is installed in the coil drum (4) and is connected to the output end of the motor on the placement rack (2).

3. The sludge low-temperature drying and medium-temperature carbonization linkage device according to claim 2 is characterized in that: The side outer cover of the turntable (7) abuts against the outer wall of the turning and drying cylinder (9), the side outer cover of the turntable (7) and the holes on the turning and drying cylinder (9) are arranged alternately, and a return spring (10) is sleeved and installed on the outer wall of the winding cylinder (4) on the opposite side of the turntable (7) and the turning and drying cylinder (9).

4. The sludge low-temperature drying and medium-temperature carbonization linkage device according to claim 3 is characterized in that: The inner wall of the drying tank (3) is provided with a material pushing mechanism (12), the material pushing mechanism (12) comprising an air cavity (121), a piston disc (122) and a push column (123); the air cavity (121) is fixed to the inner wall of one side of the drying tank (3) by means of bolts; the piston disc (122) is slidably connected in the air cavity (121); one side of the piston disc (122) is fixedly connected to the push column (123); one end of the push column (123) passes through one side of the air cavity (121) and extends into the drying tank (3); one side of the air cavity (121) is connected to a ventilation pipe (124).

5. The sludge low-temperature drying and medium-temperature carbonization linkage device according to claim 4 is characterized in that: The inner wall of the drying tank (3) is rotatably connected to a limiting sleeve (14) via a bearing, one end of the top column (123) abuts against one side of the limiting sleeve (14), and a protrusion on one side of the flip drying cylinder (9) abuts against the other side of the limiting sleeve (14).

6. The sludge low-temperature drying and medium-temperature carbonization linkage device according to claim 1 is characterized in that: A sealing body (17) is movably connected inside the material control box (16), and a through groove (18) is provided on the sealing body (17). One side of the through groove (18) is connected to the slag outlet (13), and the other side of the through groove (18) is connected to the connecting pipe (20).

7. The sludge low-temperature drying and medium-temperature carbonization linkage device according to claim 1 is characterized in that: A heat preservation pipe (15) is fixedly connected to one side of the heat exchanger (19), and the other end of the heat preservation pipe (15) passes through the drying tank (3) and is connected to the coiling drum (4).

8. A sludge low-temperature drying and medium-temperature carbonization linkage device according to any one of claims 1 to 7, characterized in that: The linkage method of low-temperature drying and medium-temperature carbonization of sludge is: Drum preheating and drying, the rotary kiln (21) is heated in advance, and the sealing body (17) in the material control box (16) is turned so that the through groove (18) of the sealing body (17) faces the connecting pipe (20) and the heat exchanger (19), and the air in the rotary kiln (21) is preheated. The hot air flows along the sealing body (17) into the heat exchanger (19), and the high-temperature gas heats the water in the heat exchanger (19). At the same time, the gasified air heats the air around the heat exchanger (19), and then the air is heated to 80° C. and blown into the drying tank (3) through the blower along the insulation pipe (15); The high-temperature airflow is discharged into the rotating drying cylinder (9) along the air holes on the winding cylinder (4), and then the sludge is discharged from the side of the feed pipe (5) into the winding cylinder (4). The rotating fan blades continuously push the sludge to move, and finally the sludge is squeezed out from the side of the sludge sleeve (11) and falls into the rotating drying cylinder (9). At the same time, the rotating movable disk (6) drives the rotating disk (7) to rotate, so that the entire rotating drying cylinder (9) drives the strip-shaped sludge to rotate and dry; The discharge material is carbonized at high temperature. The pressure in the air chamber (121) is increased by exhausting air into the vent pipe (124). The piston plate (122) pushes the top column (123) to contact the limit sleeve (14). The limit sleeve (14) rotates and changes the rotation trajectory of the flip drying cylinder (9), so that the holes on the outer cover of the turntable (7) overlap with the holes on the flip drying cylinder (9), and the strip-shaped sludge is cut off and then discharged into the bottom of the drying tank (3), and finally discharged into the material control box (16) along the slag outlet (13). The sealing block rotates in advance so that the through groove (18) faces the connecting pipe (20) and the drying tank (3). Then the sludge enters the rotary kiln (21) along the connecting pipe (20). During the rotation, it is heated to 850°C for carbonization treatment, and the carbonized sludge is finally discharged from the side of the slag discharge box (22).

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