Sludge drying machine

Abstract

The utility model discloses a sludge drying machine, which relates to the technical field of waste treatment, and comprises a mounting bracket and a gas compressor, the top of the mounting bracket is fixedly connected with a left fixing part, and the right side, far away from the left fixing part, of the top of the mounting bracket is fixedly connected with a right fixing part. By arranging the hollow inner screw, the jacket outer cylinder and the inner screw outer cylinder, high-humidity gas obtained after materials are dried in the rotary outer cylinder is pumped out and reheated, one part of the gas enters the rotary outer cylinder again to be dried and used, and the other part of the gas is compressed through the gas compressor; one part of pressurized gas is exhausted into the hollow inner screw inside the rotary outer barrel, the other part of pressurized gas is exhausted into the jacket outer barrel outside the hollow inner screw, vaporization heat is released by making contact with the dividing wall of a lower-temperature material, the material conveyed inside the inner screw outer barrel is heated and dried, and the cost can be saved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste material treatment, in particular to a sludge drying machine. Background Art

[0002] With the rapid development of cities, the accelerated construction of municipal sewage treatment plants and the continuous increase in sewage volume will inevitably lead to the generation of a large amount of sludge. At present, traditional sewage treatment plants generally use sludge dryers to dry sludge in order to reduce the moisture content of the sludge, and then the treated sludge is landfilled, solidified or dried. However, the existing sludge dryers cannot utilize the heat of vaporization, resulting in a waste of resources and making it difficult to achieve energy-saving and efficiency-enhancing effects. Utility Model Content

[0003] In view of the deficiencies in the prior art, the utility model provides a sludge dryer to solve the problems raised in the above background technology.

[0004] To achieve the above objectives, the utility model is implemented through the following technical solutions: a sludge dryer comprises a mounting bracket and a gas compressor, the top of the mounting bracket is fixedly connected with a left fixing part, the top of the mounting bracket is fixedly connected with a right fixing part on the right side away from the left fixing part, a rotating outer cylinder is movably connected between the left fixing part and the right fixing part, the rotating outer cylinder is an outer drying area, a left end combined seal of the outer cylinder is installed between the left fixing part and the rotating outer cylinder, and a right end combined seal of the outer cylinder is installed between the rotating outer cylinder and the right fixing part, the left fixed insulation and the right fixed insulation are both fixedly connected with a jacketed outer cylinder inside, the outer cylinder insulation is located on the outside of the jacketed outer cylinder, the inside of the jacketed outer cylinder is fixedly connected with an inner screw outer cylinder, the inside of the inner screw outer cylinder is rotatably connected with a hollow inner screw, a plurality of inner screw hollow spiral sheets are arranged on the outside of the hollow inner screw, and pressure is provided on the surface of the hollow inner screw and on the inner side of the hollow spiral sheets of the inner screw The inner screw has a gas inlet and outlet hole, and the hollow spiral sheets of the inner screw are connected to the inner cavity of the hollow inner screw through the gas inlet and outlet hole. The bottom of the inner screw outer barrel is fixedly connected with the material internal outlet, and the top of the left fixed part is fixedly connected with the material inlet. One end of the material inlet extends to the inside of the inner screw outer barrel, and both ends of the hollow inner screw extend to the outside of the inner screw outer barrel. The left end of the hollow inner screw is connected to the gas outlet rotary joint of the compressed furnace, and the right end of the hollow inner screw is connected to the A rotary joint for compressed furnace gas inlet is connected, a plurality of guide plates are arranged on the outside of the inner screw outer cylinder, a plurality of external fins are arranged on the outside of the inner screw outer cylinder, water holes are arranged at the bottom of the guide plates, compressed furnace gas inlet and outlet holes are arranged on the outside of the hollow inner screw and on the inside of the hollow spiral sheet of the inner screw, the hollow inner screw is connected with the inside of the hollow spiral sheet of the inner screw through the compressed furnace gas inlet and outlet holes, and the jacket outer cylinder and the hollow inner screw constitute an inner drying area.

[0005] Optionally, the bottoms of the left fixed part and the right fixed part are fixedly connected to the mounting bracket via a support frame, the outer side of the left fixed part is provided with a left fixed insulation, the outer side of the right fixed part is provided with a right fixed insulation, the outer side of the rotating outer cylinder is provided with an outer cylinder insulation, the top of the mounting bracket is fixedly connected to a first drive motor, the output end of the first drive motor and the outer side of one end of the hollow inner screw are fixedly sleeved with a meshing first transmission gear, the top of the mounting bracket and the outer side of the rotating outer cylinder are fixedly connected with a rotating frame, the outer side of the rotating outer cylinder is movably connected to the inner side of the outer cylinder insulation, and two groups of second drive motors are fixedly connected to the top of the mounting bracket, and the output end of the second drive motor and the outer side of the rotating outer cylinder are fixedly sleeved with a meshing second transmission gear.

[0006] Optionally, the top of the left fixed part is fixedly connected to a circulating air inlet, and the top of the right fixed part is fixedly connected to a circulating air outlet, the circulating air outlet is connected to a filter via a pipe, the filter is connected to a circulating fan via a pipe, the circulating fan is connected to a heater via a pipe, and the heater is connected to the circulating air inlet via a pipe.

[0007] Optionally, a first compressed gas channel is installed at one end of the compressed furnace gas inlet rotary joint, one end of the first compressed gas channel is connected to a gas compressor through a pipeline, the gas compressor is connected to a compressed furnace gas fixed inlet through a second compressed gas channel, one end of the compressed furnace gas fixed inlet extends to the interior of the jacket outer cylinder, and a jacket condensate outlet is installed at the bottom of the left fixed part, and the top of the jacket condensate outlet extends to the interior of the jacket outer cylinder.

[0008] Optionally, a second gas outlet pipe is installed at one end of the compressed gas outlet rotary joint, a main pipe is installed at one end of the second gas outlet pipe, the bottom end of the main pipe is connected to an automatic drainage device, the top end of the main pipe is connected to a back pressure valve, the back pressure valve is connected to an exhaust pipe through a pipeline, the automatic drainage device is connected to a drainage pipe through a pipeline, the bottom of the left fixed part is fixedly connected to a final material outlet, the bottom of the inner screw outer barrel is installed with an internal material outlet, and the bottom of the internal material outlet extends to below the jacket outer barrel.

[0009] Optionally, the gas compressor is connected to the circulating fan and the pipeline between the filter through a pipeline, and a first furnace gas outlet pipe is installed at one end of the main pipe, and one end of the first furnace gas outlet pipe extends to the inside of the outer tube of the jacket.

[0010] The utility model provides a sludge dryer, which has the following beneficial effects:

[0011] 1. The sludge dryer is provided with a hollow inner screw, a jacketed outer cylinder and an inner screw outer cylinder. It can extract the high-humidity gas after drying the material in the rotating outer cylinder for reheating. Part of the gas re-enters the inside of the rotating outer cylinder for drying, and the other part of the gas is compressed by a gas compressor. Part of the pressurized gas is discharged into the inside of the hollow inner screw inside the rotating outer cylinder, and the other part of the pressurized gas is discharged into the inside of the jacketed outer cylinder outside the hollow inner screw. The heat of vaporization is released by contacting with the partition wall of the material with a lower temperature, and the material transported inside the inner screw outer cylinder is heated and dried, which can save costs.

[0012] 2. The sludge dryer is provided with an inner screw hollow spiral sheet, a hollow inner screw and an inner screw outer barrel. The material falls into the inner screw outer barrel through the material inlet, and the first transmission gear is driven to rotate by the output end of the first drive motor, so that the first transmission gear drives the hollow inner screw to rotate, so that the hollow inner screw drives the inner screw hollow spiral sheet to push the material inside the inner screw outer barrel to move toward the material internal outlet direction. When the material passes through the hollow inner screw and the guide plate, the hollow inner screw and the guide plate and the jacketed outer barrel dry the material, and then the material falls into the inner wall of the rotating outer barrel, and at the same time, the second transmission gear is driven to rotate by the output end of the second drive motor, and the rotating outer barrel is driven to rotate by the second transmission gear, and the hot air inside the rotating outer barrel is used to finally dry the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the internal structure of the utility model;

[0014] Figure 2 This is a cross-sectional view of the utility model at BB;

[0015] Figure 3 For this utility model Figure 2 A magnified image of point A;

[0016] Figure 4 For this utility model Figure 1 Enlarged view of point B.

[0017] In the figure: 1. compressed gas outlet rotary joint; 2. first transmission gear; 3. hollow inner screw; 4. material inlet; 5. left fixed insulation; 6. inner screw hollow spiral sheet; 7. left fixed part; 8. outer cylinder left end combined seal; 9. jacket outer cylinder; 10. guide plate; 11. rotating outer cylinder; 12. outer cylinder insulation; 13. outer cylinder right end combined seal; 14. right fixed part; 15. right fixed insulation; 16. compressed gas inlet rotary joint; 17. compressed gas fixed inlet; 18. material internal outlet; 19. second transmission gear; 20. outer fin; 21. material final outlet; 22. inner screw Rod outer tube; 23, jacket condensate outlet; 24, mounting bracket; 25, water hole; 26, compressed furnace gas inlet and outlet; 27, filter; 28, circulating air outlet; 29, circulating fan; 30, heater; 31, circulating air inlet; 32, gas compressor; 33, first compressed gas channel; 34, second compressed gas channel; 35, first furnace gas outlet pipe; 36, second furnace gas outlet pipe; 37, automatic drainage device; 38, main pipe; 39, back pressure valve; 40, drain pipe; 41, exhaust pipe; 42, first drive motor; 43, second drive motor; 44, rotating frame; 45, support frame. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0019] See also Figures 1 to 4The utility model provides a technical solution: a sludge dryer, including a mounting bracket 24 and a gas compressor 32, the top of the mounting bracket 24 is fixedly connected with a left fixing part 7, the top of the mounting bracket 24 away from the right side of the left fixing part 7 is fixedly connected with a right fixing part 14, a rotating outer cylinder 11 is movably connected between the left fixing part 7 and the right fixing part 14, the rotating outer cylinder 11 is an outer drying area, a left end combined seal 8 of the outer cylinder is installed between the left fixing part 7 and the rotating outer cylinder 11, a right end combined seal 13 of the outer cylinder is installed between the rotating outer cylinder 11 and the right fixing part 14, and the left fixed seal The right fixed heat preservation 15 and the right fixed heat preservation 15 are both fixedly connected with the jacket outer cylinder 9, the outer cylinder heat preservation 12 is located on the outside of the jacket outer cylinder 9, the inner cylinder 22 is fixedly connected with the inner screw outer cylinder 22, the inner screw outer cylinder 22 is rotatably connected with the hollow inner screw 3, the outer side of the hollow inner screw 3 is provided with a plurality of inner screw hollow spiral pieces 6, the surface of the hollow inner screw 3 and the inner side of the inner screw hollow spiral pieces 6 are provided with compressed furnace gas inlet and outlet holes 26, the inner screw hollow spiral pieces 6 are connected with the inner cavity of the hollow inner screw 3 through the compressed furnace gas inlet and outlet holes 26, and the bottom of the inner screw outer cylinder 22 is connected with the inner cavity of the hollow inner screw 3. The material internal outlet 18 is fixedly connected, the top of the left fixed part 7 is fixedly connected with the material inlet 4, one end of the material inlet 4 extends to the inside of the inner screw outer tube 22, both ends of the hollow inner screw 3 extend to the outside of the inner screw outer tube 22, the left end of the hollow inner screw 3 is connected to the compressed furnace gas outlet rotary joint 1, the right end of the hollow inner screw 3 is connected to the compressed furnace gas inlet rotary joint 16, the outer side of the inner screw outer tube 22 is provided with a plurality of guide plates 10, the outer side of the inner screw outer tube 22 is provided with a plurality of external fins 20, and the bottom of the guide plates 10 is provided with water holes 25 , compressed gas inlet and outlet holes 26 are provided on the outer side of the hollow inner screw 3 and on the inner side of the hollow spiral sheet 6 of the inner screw, and the hollow inner screw 3 is connected with the inner part of the hollow spiral sheet 6 of the inner screw through the compressed gas inlet and outlet holes 26, and the jacket outer cylinder 9 and the hollow inner screw 3 form an inner drying area, and the pressurized gas can be discharged into the jacket outer cylinder 9 through the water hole 25 to release the heat of vaporization, and the generated condensed water is discharged through the jacket condensed water outlet 23, and the pressurized gas input into the hollow inner screw 3 releases the heat of vaporization, and the generated condensed water is discharged into the main pipe 38 through the second furnace gas outlet pipe 36;

[0020] The material enters from the inner drying area, which is a low-temperature area, and falls into the outer drying area after preheating, which is a high-temperature area. The outer drying area is directly heated by hot air circulation, and the heat source is waste heat, electric heating, gas heating, or a combination thereof. The inner drying area uses the high-humidity furnace gas generated in the outer drying area to compress and pass it into the hollow inner screw 3 and the jacket outer cylinder 9 and the inner screw outer cylinder 22 for heating.

[0021] The bottom of the left fixing part 7 and the right fixing part 14 are fixedly connected to the mounting bracket 24 through the support frame 45, the outer side of the left fixing part 7 is provided with a left fixed heat preservation 5, the outer side of the right fixing part 14 is provided with a right fixed heat preservation 15, the outer side of the rotating outer cylinder 11 is provided with an outer cylinder heat preservation 12, the top of the mounting bracket 24 is fixedly connected with a first drive motor 42, the output end of the first drive motor 42 and the outer side of one end of the hollow inner screw 3 are fixedly sleeved with a meshing first transmission gear 2, the top of the mounting bracket 24 and located at the rotating outer cylinder The outer side of the rotating outer cylinder 11 is fixedly connected with a rotating frame 44, the outer side of the rotating outer cylinder 11 is movably connected with the inner side of the outer cylinder insulation 12, and two sets of second drive motors 43 are fixedly connected to the top of the mounting bracket 24. The output end of the second drive motor 43 and the outer side of the rotating outer cylinder 11 are fixedly sleeved with a meshing second transmission gear 19, and the output end of the second drive motor 43 can drive the rotating outer cylinder 11 to rotate through the second transmission gear 19, and the rotating outer cylinder 11 rotates inside the rotating frame 44, so that the rotating outer cylinder 11 can be limited.

[0022] Among them, a circulating air inlet 31 is fixedly connected to the top of the left fixed part 7, and a circulating air outlet 28 is fixedly connected to the top of the right fixed part 14. The circulating air outlet 28 is connected to the filter 27 through a pipeline, and the filter 27 is connected to the circulating fan 29 through a pipeline. The circulating fan 29 is connected to the heater 30 through a pipeline. The heater 30 is connected to the circulating air inlet 31 through a pipeline, so that the air inside the rotating outer cylinder 11 used for heating the material can be re-discharged into the heater 30 for heating, and then the heated air is discharged into the rotating outer cylinder 11.

[0023] Among them, a first compressed gas channel 33 is installed at one end of the compressed furnace gas inlet rotary joint 16, one end of the first compressed gas channel 33 is connected to the gas compressor 32 through a pipeline, and the gas compressor 32 is connected to the compressed furnace gas fixed inlet 17 through the second compressed gas channel 34. One end of the compressed furnace gas fixed inlet 17 extends to the inside of the jacket outer tube 9, and a jacket condensate outlet 23 is installed at the bottom of the left fixed part 7. The top end of the jacket condensate outlet 23 extends to the inside of the jacket outer tube 9, and the condensate inside the jacket outer tube 9 can be discharged through the jacket condensate outlet 23.

[0024] Among them, a second furnace gas outlet pipe 36 is installed at one end of the compressed furnace gas outlet rotary joint 1, and a main pipe 38 is installed at one end of the second furnace gas outlet pipe 36. The bottom end of the main pipe 38 is connected to the automatic drainage device 37, and the top of the main pipe 38 is connected to the back pressure valve 39. The back pressure valve 39 is connected to the exhaust pipe 41 through a pipeline, and the automatic drainage device 37 is connected to the drainage pipe 40 through a pipeline. The bottom of the left fixed part 7 is fixedly connected to the final material outlet 21, and the bottom of the inner screw outer barrel 22 is installed with the internal material outlet 18. The bottom of the internal material outlet 18 extends to the bottom of the jacket outer barrel 9, so that the material after the initial heating inside the inner screw outer barrel 22 is discharged into the rotating outer barrel 11 for heating and drying again.

[0025] Among them, the gas compressor 32 is connected with the circulation fan 29 and the pipeline between the filter 27 through a pipeline. A first furnace gas outlet pipe 35 is installed at one end of the main pipe 38. One end of the first furnace gas outlet pipe 35 extends to the inside of the jacket outer tube 9, so that the gas inside the jacket outer tube 9 can enter the main pipe 38 through the first furnace gas outlet pipe 35, and the gas is discharged through the exhaust pipe 41, and the cooling water is discharged through the drain pipe 40.

[0026] In summary, when the sludge dryer is in use, the material falls into the inner screw outer barrel 22 through the material inlet 4, and the first transmission gear 2 is driven to rotate by the output end of the first drive motor 42, so that the first transmission gear 2 drives the hollow inner screw 3 to rotate, so that the hollow inner screw 3 drives the inner screw hollow spiral sheet 6 to push the material inside the inner screw outer barrel 22 to move toward the material internal outlet 18, and the gas compressor 32 sucks out the high-water content furnace gas in the pipeline between the filter 27 and the circulating fan 29, and then compresses it through the gas compressor 32, so that a part of the pressurized gas passes through the filter 27 and the circulating fan 29. The compressed gas passes through the first compressed gas channel 33 and enters the compressed furnace gas inlet rotary joint 16, then enters the guide plate 10 through the compressed furnace gas inlet and outlet holes 26, then re-enters the hollow inner screw 3, and then enters the second furnace gas outlet pipe 36 through the compressed furnace gas outlet rotary joint 1. Another part of the pressurized gas passes through the second compressed gas channel 34 and enters the compressed furnace gas fixed inlet 17, and then enters the jacket outer tube 9, so that the gas releases the heat of vaporization, and the inner screw outer tube 22 is heated through the outer fins 20. The gas is guided through the guide plate 10. The material passes through the hollow inner screw 3 and the guide plate 10, and then enters the main pipe 38. When the material passes through the hollow inner screw 3 and the guide plate 10, the material is dried by the hollow inner screw 3, the guide plate 10 and the jacket outer cylinder 9, and then the material falls into the inner wall of the rotating outer cylinder 11. At the same time, the second transmission gear 19 is driven to rotate by the output end of the second drive motor 43, and the rotating outer cylinder 11 is driven to rotate by the second transmission gear 19. At the same time, the circulating fan 29 extracts the air inside the rotating outer cylinder 11 through the circulating air outlet 28, and then enters through the filter 27. The air is filtered and then discharged into the heater 30 through the circulating fan 29 to heat the air. The heated air is discharged into the rotating outer cylinder 11 to heat and dry the material in the rotating outer cylinder 11. As the rotating outer cylinder 11 rotates, the material moves along the inclined inner wall of the rotating outer cylinder 11 to the material final outlet 21, so that the dried material falls out through the material final outlet 21. The gas-liquid mixture input into the main pipe 38 is introduced into the exhaust pipe 41 through the back pressure valve 39, and the cooling water is discharged into the drain pipe 40 through the automatic drain device 37.

[0027] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A sludge dryer, comprising a mounting bracket (24) and a gas compressor (32), characterized in that: The top of the mounting bracket (24) is fixedly connected to a left fixing portion (7), the top of the mounting bracket (24) is fixedly connected to a right side away from the left fixing portion (7), a rotating outer cylinder (11) is movably connected between the left fixing portion (7) and the right fixing portion (14), an outer cylinder heat preservation (12) is arranged on the outer side of the rotating outer cylinder (11), the rotating outer cylinder (11) is an outer drying area, an outer cylinder left end combined seal (8) is installed between the left fixing portion (7) and the rotating outer cylinder (11), a left fixed heat preservation (5) is arranged on the outer side of the left fixing portion (7), and a right fixed portion (14) is arranged on the outer side. There is a right fixed heat preservation (15), an outer cylinder right end combined seal (13) is installed between the rotating outer cylinder (11) and the right fixed part (14), the left fixed heat preservation (5) and the right fixed heat preservation (15) are fixedly connected to the inside of the jacket outer cylinder (9), the outer cylinder heat preservation (12) is located on the outside of the jacket outer cylinder (9), the inside of the jacket outer cylinder (9) is fixedly connected to the inner screw outer cylinder (22), the inner screw outer cylinder (22) is rotatably connected to the inside of the hollow inner screw (3), the outer side of the hollow inner screw (3) is provided with a plurality of inner screw hollow spiral sheets (6), the surface of the hollow inner screw (3) and the inner screw hollow spiral sheets are located The inner side of the inner screw (6) is provided with a compressed furnace gas inlet and outlet hole (26), the hollow spiral sheet (6) of the inner screw is connected to the inner cavity of the hollow inner screw (3) through the compressed furnace gas inlet and outlet hole (26), the bottom of the inner screw outer tube (22) is fixedly connected with a material internal outlet (18), the top of the left fixed part (7) is fixedly connected with a material inlet (4), one end of the material inlet (4) extends to the inside of the inner screw outer tube (22), both ends of the hollow inner screw (3) extend to the outside of the inner screw outer tube (22), the left end of the hollow inner screw (3) is connected with a compressed furnace gas outlet rotary joint (1), and the hollow inner screw (3) The right end is connected to a compressed furnace gas inlet rotary joint (16), the outer side of the inner screw outer cylinder (22) is provided with a plurality of guide plates (10), the outer side of the inner screw outer cylinder (22) is provided with a plurality of external fins (20), the bottom of the guide plates (10) is provided with water holes (25), the outer side of the hollow inner screw (3) and the inner side of the hollow spiral sheet (6) of the inner screw are provided with compressed furnace gas inlet and outlet holes (26), the hollow inner screw (3) is connected to the inside of the hollow spiral sheet (6) of the inner screw through the compressed furnace gas inlet and outlet holes (26), and the jacket outer cylinder (9) and the hollow inner screw (3) constitute an inner drying area.

2. A sludge dryer according to claim 1, characterized in that: The bottoms of the left fixed part (7) and the right fixed part (14) are fixedly connected to the mounting bracket (24) through a support frame (45); the top of the mounting bracket (24) is fixedly connected to a first drive motor (42); the output end of the first drive motor (42) and the outer side of one end of the hollow inner screw (3) are fixedly sleeved with a meshing first transmission gear (2); the top of the mounting bracket (24) and the outer side of the rotating outer cylinder (11) are fixedly connected to a rotating frame (44); the outer side of the rotating outer cylinder (11) is movably connected to the inside of the outer cylinder heat insulation (12); the top of the mounting bracket (24) is fixedly connected to two groups of second drive motors (43); the output end of the second drive motor (43) and the outer side of the rotating outer cylinder (11) are fixedly sleeved with a meshing second transmission gear (19).

3. A sludge dryer according to claim 1, characterized in that: The top of the left fixed part (7) is fixedly connected to a circulating air inlet (31), the top of the right fixed part (14) is fixedly connected to a circulating air outlet (28), the circulating air outlet (28) is connected to a filter (27) via a pipeline, the filter (27) is connected to a circulating fan (29) via a pipeline, the circulating fan (29) is connected to a heater (30) via a pipeline, and the heater (30) is connected to the circulating air inlet (31) via a pipeline.

4. A sludge dryer according to claim 1, characterized in that: A first compressed gas channel (33) is installed at one end of the compressed furnace gas inlet rotary joint (16), one end of the first compressed gas channel (33) is connected to a gas compressor (32) through a pipeline, and the gas compressor (32) is connected to a compressed furnace gas fixed inlet (17) through a second compressed gas channel (34), one end of the compressed furnace gas fixed inlet (17) extends to the inside of the jacket outer tube (9), and a jacket condensate outlet (23) is installed at the bottom of the left fixed part (7), and the top end of the jacket condensate outlet (23) extends to the inside of the jacket outer tube (9).

5. A sludge dryer according to claim 1, characterized in that: A second furnace gas outlet pipe (36) is installed at one end of the compressed furnace gas outlet rotary joint (1), and a main pipe (38) is installed at one end of the second furnace gas outlet pipe (36). The bottom end of the main pipe (38) is connected to an automatic drainage device (37), and the top end of the main pipe (38) is connected to a back pressure valve (39). The back pressure valve (39) is connected to an exhaust pipe (41) through a pipeline, and the automatic drainage device (37) is connected to a drainage pipe (40) through a pipeline. The bottom of the left fixed part (7) is fixedly connected to a material final outlet (21), and the bottom of the inner screw outer barrel (22) is installed with a material internal outlet (18), and the bottom of the material internal outlet (18) extends to the bottom of the jacket outer barrel (9).

6. A sludge dryer according to claim 5, characterized in that: The gas compressor (32) is connected to the circulating fan (29) and the pipeline between the filter (27) through a pipeline, and a first furnace gas outlet pipe (35) is installed at one end of the main pipe (38), and one end of the first furnace gas outlet pipe (35) extends to the inside of the jacket outer cylinder (9).

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