Method for drying sludge through microwave pyrolysis

Abstract

The invention discloses a method for drying sludge through microwave pyrolysis, which relates to the technical field of sludge treatment and comprises the following steps: step 1, reducing the water content of the sludge in a mechanical dehydration manner, and then screening out lumps; 2, extruding the sludge, and uniformly laying the sludge on a microwave material distribution belt; 3, the material distribution belt penetrates through a tunnel type microwave generator, and the sludge is heated and dried through microwaves; 4, the dried sludge is separated from the cloth belt, and the sludge is collected; wherein a tunnel type microwave generator adopted in the third step comprises a guide roller and a pressing roller, the guide roller makes contact with the lower surface of the cloth belt conveying part, so that the cloth belt forms an inclined section, and the pressing roller is located behind the guide roller and makes contact with the upper surface of the cloth belt conveying part, so that the cloth belt forms an arc-shaped section tightly attached to the guide roller. In the invention, the turning plate does not need to be contacted with the cloth belt, so that the condition that the surface of the conveying belt is scratched is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of sludge treatment, and specifically to a method for microwave pyrolysis and drying of sludge. Background Art

[0002] With the acceleration of the global industrialization and urbanization processes, the amount of sludge generated has shown exponential growth. As a by-product in the sewage treatment process, the treatment and disposal of sludge have increasingly attracted a great deal of attention from all sectors of society. Traditional sludge treatment methods such as landfill and incineration not only occupy a large amount of land resources but may also cause secondary pollution to the environment. In recent years, the application of microwave drying technology in the field of sludge treatment has drawn attention. Sludge drying refers to removing the moisture in sludge to a certain moisture content for subsequent utilization or disposal. Microwave heating technology utilizes the electromagnetic field of microwaves to cause polar molecules such as water molecules inside the heated object to generate high-frequency vibrations, and the mutual friction between molecules generates heat, thereby achieving rapid heating and drying. The application of microwave technology in sludge drying treatment mainly realizes the rapid drying of sludge through microwave heating.

[0003] The Chinese utility model patent with the publication number CN204675978U discloses a microwave sludge dryer, including: a sludge conveyor belt, a sludge conveying drive mechanism, a microwave action cavity, and a steam discharge device; the main part of the sludge conveyor belt passes through the microwave action cavity, and the sludge conveyed by the sludge conveyor belt is dried by the microwaves emitted by the microwave action cavity; a steam discharge device for discharging the steam generated by sludge drying is installed at the top of the microwave action cavity.

[0004] The Chinese invention patent with the publication number CN115893786B discloses a microwave pyrolysis sludge drying system and device, including a water vapor recovery device, a microwave pyrolysis drying device, a pyrolysis residue recovery device, and an oil and gas recovery device that are connected to each other through pipelines. The microwave pyrolysis drying device is provided with a microwave reaction cavity and a crushing cavity that are connected to each other, and two compression zones are provided in the microwave reaction cavity.

[0005] In the traditional microwave drying process, the sludge is evenly coated on the surface of the conveyor belt, and the thickness of the sludge layer is very thin, so that the moisture in the sludge can be fully evaporated. However, when the dried sludge is separated from the conveyor belt in this way, due to the very thin dried sludge layer, a large amount of dust is easily generated, and the dried sludge is prone to scattering during the collection process. Therefore, at present, the sludge is generally pressed into a cake shape and then placed on the surface of the conveyor belt. The thickness of the sludge cake is about 2-3 cm, and there is a certain distance between adjacent sludge cakes. After drying, the thickness of the sludge cake will shrink, but it can still maintain the cake shape, so that it is convenient for the operator to separate it from the conveyor belt and collect it. However, due to the relatively thick sludge cake, the moisture in its lower layer is not easily dissipated. Therefore, during the drying process, the sludge cake needs to be turned over by a turning plate. Each time the turning plate is turned over, it will contact the surface of the conveyor belt and generate mutual extrusion force, which will scratch the surface of the conveyor belt during long-term operation. Summary of the Invention

[0006] The purpose of the present invention is to provide a method for microwave pyrolysis drying of sludge to solve the above deficiencies in the prior art.

[0007] To achieve the above purpose, the present invention provides the following technical solutions: A method for microwave pyrolysis drying of sludge, comprising the following steps:

[0008] Step 1: Reduce the moisture content of the sludge by mechanical dehydration, and then screen out the lumps;

[0009] Step 2: Extrude the sludge and evenly lay the sludge on the microwave cloth belt;

[0010] Step 3: The cloth belt passes through a tunnel-type microwave generator, and the sludge is heated and dried by microwave;

[0011] Step 4: Separate the dried sludge from the cloth belt and collect the sludge;

[0012] Among them, the tunnel-type microwave generator used in Step 3 includes a guide roller and a pressure roller rotatably installed in the tunnel along the horizontal direction. The guide roller and the pressure roller are parallel to each other and perpendicular to the conveying direction of the cloth belt; the guide roller contacts the lower surface of the conveying part of the cloth belt, so that the cloth belt forms an inclined section, and the pressure roller is located behind the guide roller and contacts the upper surface of the conveying part of the cloth belt, so that the cloth belt forms an arc section closely attached to the guide roller.

[0013] A horizontal shaft parallel to the pressure roller is also rotatably installed at a position corresponding to the upper part of the pressure roller in the tunnel. A turning plate parallel to its axis is fixedly installed on the horizontal shaft. An L-shaped supporting plate is fixedly installed on one side surface of the turning plate; in the initial state, the upper surface of the turning plate is flush with the upper surface of the inclined section of the cloth belt.

[0014] As a preferred technical solution of the present invention, anti-slip grooves are provided on the surface of the pressure roller, an incomplete gear is fixedly installed at the end of the pressure roller, a complete gear is fixedly installed at the end of the horizontal shaft, a torsion spring is connected between the end of the horizontal shaft and the side wall of the tunnel, and when the incomplete gear and the complete gear are in a separated state, the torsion spring makes the horizontal shaft and the flap in an initial state.

[0015] As a preferred technical solution of the present invention, a number of rollers are evenly installed on the surface of the flap.

[0016] As a preferred technical solution of the present invention, the tunnel-type microwave generator further includes an auxiliary roller movably installed in the tunnel, the auxiliary roller is parallel to the horizontal shaft and can horizontally move relative to the horizontal shaft.

[0017] As a preferred technical solution of the present invention, a first sector gear is further fixedly installed at the end of the pressure roller, and a second sector gear is fixedly installed at the end of the auxiliary roller; a transmission gear cooperating with the first sector gear is also rotatably installed on the outer wall of the tunnel, and a protective shell for protecting the incomplete gear, the complete gear, the first sector gear and the second sector gear is fixedly installed outside the tunnel.

[0018] As a preferred technical solution of the present invention, a slider is slidably installed on the protective shell in the horizontal direction, the auxiliary roller is rotatably engaged with the slider and a torsion spring is connected between the two; a support seat is fixedly installed on the protective shell, and an elastic telescopic rod is fixedly installed on the support seat, and the end of the telescopic section of the elastic telescopic rod is fixedly connected to the slider.

[0019] As a preferred technical solution of the present invention, the distances from each point on the arc edge of the first sector gear to the axis of the pressure roller are the same; the second sector gear includes a first part and a second part, the distances from each point on the arc edge of the first part to the axis of the auxiliary roller are the same, and the distances from each point on the second part to the axis of the auxiliary roller gradually change from one end to the other end.

[0020] As a preferred technical solution of the present invention, the cross section of the auxiliary roller is circular, the distance between the auxiliary roller and the upper surface of the inclined section of the cloth belt is the same as the thickness of the mud cake; strip-shaped protrusions are fixedly installed on the circumferential surface of the auxiliary roller, and the cross section of the protrusion is crescent-shaped.

[0021] As a preferred technical solution of the present invention, a hollow plate is fixedly installed inside the tunnel of the tunnel-type microwave generator, a gas guide plate communicating with its interior is fixedly installed at one end of the hollow plate, and the air vent of the gas guide plate is strip-shaped and faces the connection between the inclined section of the cloth belt and the arc section of the cloth belt.

[0022] As a preferred technical solution of the present invention, a piston plate is slidably installed in the hollow plate, and an elastic member is connected between the piston plate and the hollow plate; a reversing roller parallel to the horizontal axis is rotatably installed in the tunnel, and a rope is connected between the horizontal axis and the piston plate, and the rope is in contact with the reversing roller.

[0023] In the above technical solution, a method for microwave pyrolysis and drying of sludge provided by the present invention, during the microwave drying of the sludge cake, through the cooperation of the guiding roller and the pressing roller, the cloth belt forms an inclined section and an arc section. After the sludge cake on the cloth belt moves to the junction position of the inclined section and the arc section following the cloth belt, it will translate onto the turning plate under the action of its own inertia and be turned over under the action of the turning plate; in the above process, on the one hand, the tensile deformation that occurs instantaneously when the cloth belt changes from the inclined section to the arc section is utilized to separate it from the bottom surface of the sludge cake, and on the other hand, the sludge cake is separated from the cloth belt by its own inertia, and the turning plate does not need to contact the cloth belt, thus avoiding the situation that the surface of the conveyor belt is scratched.

[0024] In addition, an auxiliary roller is provided in the present invention, and the auxiliary roller can automatically assist the sludge cake to move onto the turning plate, and during the turning process of the turning plate, the auxiliary roller can automatically avoid it, avoiding interference with the turning plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a three-dimensional structural schematic diagram of a tunnel-type microwave generator in the embodiment;

[0027] Figure 2 is Figure 1 an enlarged schematic diagram of part A in

[0028] Figure 3 It is an internal structural schematic diagram of a tunnel-type microwave generator in the embodiment;

[0029] Figure 4 is Figure 3 an enlarged schematic diagram of part B in

[0030] Figure 5 It is a working state schematic diagram of an incomplete gear and a complete gear in the embodiment;

[0031] Figure 6 is Figure 5 an enlarged schematic diagram of part C in

[0032] Figure 7Schematic diagram of the working states of the first sector gear and the second sector gear in the embodiment;

[0033] Figure 8 is Figure 7 an enlarged schematic diagram of the position D in

[0034] Explanation of reference numerals:

[0035] 1. Guide roller; 2. Pressing roller; 3. Horizontal shaft; 4. Flap; 5. Supporting plate; 6. Incomplete gear; 7. Complete gear; 8. Roller; 9. Auxiliary roller; 10. First sector gear; 11. Second sector gear; 1101. First part; 1102. Second part; 12. Protective shell; 13. Slide block; 14. Elastic telescopic rod; 15. Protrusion; 16. Hollow plate; 17. Air guide plate; 18. Piston plate; 19. Elastic member; 20. Reversing roller; 21. Rope; 22. Transmission gear. Detailed implementation manners

[0036] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0037] The present embodiment provides a method for microwave pyrolysis and drying of sludge, including the following steps:

[0038] Step 1: Reduce the moisture content of the sludge by mechanical dehydration, and then screen out the lumps;

[0039] Step 2: Extrude the sludge and evenly lay the sludge on the microwave cloth belt;

[0040] Step 3: The cloth belt passes through a tunnel-type microwave generator, and the sludge is heated and dried by microwaves;

[0041] Step 4: Separate the dried sludge from the cloth belt and collect the sludge;

[0042] Among them, in step 3, a tunnel-type microwave generator as Figure 1 shown is used, which includes a tunnel. Inside the tunnel, a plurality of microwave instruments and flared air suction pipes are evenly installed along the conveying direction of the cloth belt. An exhaust pipe is installed at the top of the tunnel. A guide roller 1 and a pressing roller 2 are rotatably installed horizontally in the tunnel. The guide roller 1 and the pressing roller 2 are parallel to each other and perpendicular to the conveying direction of the cloth belt. The cloth belt is driven by a transmission wheel, and the extruded mud cake falls on the cloth belt and enters the tunnel synchronously with the cloth belt. The upper half of the cloth belt is in contact with the mud cake and is the conveying part. The guide roller 1 is in contact with the lower surface of the conveying part of the cloth belt, so that the cloth belt forms Figure 3 an inclined section in Figure 3The arc section that is in close contact with the guide roller 1. In this way, when the fabric belt changes from the inclined section to the arc section, a certain tensile deformation will occur instantaneously. During the deformation process, the bottom surface of the mud cake will be separated from it; then, after the fabric belt changes from the inclined section to the arc section, it changes direction, while the mud cake moves along the original direction under the action of inertia.

[0043] As Figure 4 shown, a horizontal shaft 3 parallel to the pressure roller 2 is also rotatably installed at the position corresponding to the upper part of the pressure roller 2 in the tunnel. A flap 4 parallel to its axis is fixedly installed on the horizontal shaft 3. An L-shaped support plate 5 is fixedly installed on one side surface of the flap 4; in the initial state, the upper surface of the flap 4 is flush with the upper surface of the inclined section of the fabric belt. A number of rollers 8 are evenly installed on the surface of the flap 4 to reduce the friction between the mud cake and the flap 4, making it easier for the mud cake to move relative to the flap 4.

[0044] Specifically, taking Figure 4 as an example, in the initial state, after the mud cake on the inclined section of the fabric belt is separated from the fabric belt, it moves onto the flap 4 under the guiding action of the flap 4; subsequently, the flap 4 rotates clockwise by an angle of 220°. After the rotation is in place, the mud cake on the flap 4 falls back onto the fabric belt under the action of gravity, and the mud cake is turned over during this process; after the mud cake is separated from the flap 4, the flap 4 rotates counterclockwise and returns to the Figure 4 shown initial state and repeats the above process.

[0045] From the above process, it can be seen that when the mud cake is separated from the fabric belt in this embodiment, the flap 4 does not directly contact the surface of the fabric belt, but only guides and supports the mud cake, avoiding scratching the surface of the fabric belt.

[0046] As Figure 6 shown, anti-slip grooves are provided on the surface of the pressure roller 2 to increase the friction between its surface and the fabric belt. When the fabric belt moves, the pressure roller 2 is driven to rotate synchronously through the friction; an incomplete gear 6 is fixedly installed at the end of the pressure roller 2, and the incomplete gear 6 will rotate synchronously when the pressure roller 2 rotates; a complete gear 7 is fixedly installed at the end of the horizontal shaft 3. A torsion spring is connected between the horizontal shaft 3 and the outer wall of the tunnel. When the incomplete gear 6 is separated from the complete gear 7, the torsion spring makes the horizontal shaft 3 and the flap 4 in the Figure 4 shown initial state. Both the incomplete gear 6 and the complete gear 7 are located outside the tunnel.

[0047] Specifically, taking Figure 4 and Figure 6For example, when the fabric belt moves, the pressure roller 2 and the incomplete gear 6 will continuously rotate. After the incomplete gear 6 enters the meshing state with the complete gear 7, the complete gear 7 will rotate clockwise driven by the incomplete gear 6, and the horizontal shaft 3 and the flap 4 will also rotate clockwise synchronously, so as to turn over the filter cake, and the torsion spring will deform; after the filter cake is separated from the flap 4, the complete gear 7 will also disengage from the incomplete gear 6, and the horizontal shaft 3, the flap 4 and the complete gear 7 will quickly rotate counterclockwise under the action of the torsion spring and reset to Figure 4 the state shown. In this way, the flap 4 can automatically turn over the filter cake conveyed by the fabric belt, and when the conveying speed of the fabric belt is fast, the time required for the flap 4 to work once is also shortened, so that it can adapt to the conveying speed of the fabric belt. In actual production, the drying time required for sludge with different water contents is different, and the conveying speed of the fabric belt is also different. The present invention can well adapt to this actual production requirement.

[0048] As Figure 4 shown, the tunnel-type microwave generator further includes an auxiliary roller 9 movably installed in the tunnel. The auxiliary roller 9 is parallel to the horizontal shaft 3 and can move horizontally relative to the horizontal shaft 3; specifically, when the flap 4 is in Figure 4 the initial state, the auxiliary roller 9 rotates counterclockwise to push the upper surface of the filter cake to promote the filter cake to move onto the flap 4; after the filter cake moves onto the flap 4, the auxiliary roller 9 moves leftward by a certain distance to create space, so that the flap 4 can drive the filter cake to flip without interference with the auxiliary roller 9.

[0049] As Figure 1 、 Figure 2 and Figure 8As shown, a first sector gear 10 is also fixedly sleeved at the end of the pressure roller 2. The first sector gear 10 is staggered with the incomplete gear 6 in position, and the two will not interfere with each other. A second sector gear 11 is fixedly installed at the end of the auxiliary roller 9; both the first sector gear 10 and the second sector gear 11 are located outside the tunnel; a transmission gear 22 that cooperates with the first sector gear 10 is rotatably installed on the outer wall of the tunnel; a protective shell 12 for protecting the incomplete gear 6, the complete gear 7, the first sector gear 10, the second sector gear 11 and the transmission gear 22 is fixedly installed outside the tunnel; a slider 13 is slidably installed on the protective shell 12 in the horizontal direction. The auxiliary roller 9 is rotatably matched with the slider 13 and a torsion spring is connected between the two; a support seat is fixedly installed on the protective shell 12, and an elastic telescopic rod 14 is fixedly installed on the support seat. The end of the telescopic section of the elastic telescopic rod 14 is fixedly connected with the slider 13; the distances from the arc edges of the first sector gear 10 to the axis of the pressure roller 2 are the same at various places; the second sector gear 11 includes a first part 1101 and a second part 1102. One side edge of the first part 1101 and the second part 1102 coincides. The distances from the arc edges of the first part 1101 to the axis of the auxiliary roller 9 are the same at various places, and the distances from the second part 1102 to the axis of the auxiliary roller 9 gradually change from one end to the other end.

[0050] Specifically, taking Figure 4 and Figure 8For example, during the continuous rotation of the pressure roller 2 driving the incomplete gear 6 and the first sector gear 10, the first sector gear 10 enters the meshing state with the transmission gear 22. The transmission gear 22 first enters the meshing state with the first part 1101, causing the second sector gear 11 and the auxiliary roller 9 to rotate counterclockwise. The auxiliary roller 9 assists in pushing the filter cake, and the torsion spring between the auxiliary roller 9 and the slider 13 deforms. Subsequently, the transmission gear 22 enters the meshing state with the second part 1102. Since the arc edge of the second part 1102 is an involute and the transmission gear 22 is installed on the outer wall of the tunnel and cannot translate relative to the tunnel, the second sector gear 11 and the auxiliary roller 9 will translate while rotating under the action of the transmission gear 22, and the slider 13 also translates, compressing the elastic telescopic rod 14 until the transmission gear 22 disengages from the first sector gear 10. Before the transmission gear 22 disengages from the first sector gear 10, the incomplete gear 6 enters the meshing state with the complete gear 7, that is, during the translation of the auxiliary roller 9, the flap 4 has already started to drive the filter cake to rotate clockwise. When the flap 4 and the filter cake rotate a certain angle, the transmission gear 22 disengages from the first sector gear 10. The elastic telescopic rod 14 causes the slider 13, the auxiliary roller 9, and the second sector gear 11 to translate in the reverse direction and reset, and the torsion spring also causes the auxiliary roller 9 to rotate clockwise relative to the slider 13 and reset; the auxiliary roller 9 returns to the initial state. It should be noted that when the flap 4 rotates in the reverse direction and resets, since the filter cake has separated from the flap 4, there will be no interference between the flap 4 and the auxiliary roller 9. In summary, in this embodiment, the auxiliary roller 9 is used to assist in pushing the filter cake to ensure that the filter cake can move onto the flap 4, and after the pushing is completed, the auxiliary roller 9 can automatically translate a short distance to make room for the flipping of the filter cake. After the filter cake flips a certain angle, the auxiliary roller 9 can automatically reset to prepare for the pushing of the next filter cake.

[0051] During the actual processing, although the surface of the pressure roller 2 is provided with anti-slip grooves and there is a strong extrusion force between the pressure roller 2 and the fabric belt, it is impossible to completely avoid the situation of the pressure roller 2 slipping. Once the pressure roller 2 slips, the rhythm of the entire conveying process will be affected. To solve this problem, the following design is also carried out in this embodiment; as Figure 4As shown, the cross-section of the auxiliary roller 9 is circular, and the distance between the auxiliary roller 9 and the upper surface of the inclined section of the fabric belt is the same as the thickness of the mud cake; a strip-shaped protrusion 15 is fixedly installed on the circumferential surface of the auxiliary roller 9, and the cross-section of the protrusion 15 is crescent-shaped. In the initial state, the protrusion 15 faces the fabric belt and blocks the mud cake. Then, even if the pressure roller 2 slips, that is, when the flap 4 fails to reverse and reset to the initial state in time, the mud cake will not move to the arc section of the fabric belt. Only when the pressure roller 2 drives the first sector gear 10 to rotate into the meshing state with the transmission gear 22, the auxiliary roller 9 rotates, so that the protrusion 15 no longer blocks the mud cake, and the mud cake will move with the fabric belt towards the flap 4. In this way, it is avoided that the flap 4 cannot be reset in time due to the slipping of the pressure roller 2, resulting in the situation where the mud cake follows the fabric belt to reach the arc section.

[0052] As Figure 4 As shown, a hollow plate 16 is fixedly installed inside the tunnel of the tunnel-type microwave generator. One end of the hollow plate 16 is fixedly installed with a gas guide plate 17 communicating with its interior. The air vent of the gas guide plate 17 is strip-shaped and faces the connection between the inclined section and the arc section of the fabric belt, and the width of the air vent does not exceed 1 mm; a piston plate 18 is slidably installed inside the hollow plate 16, and an elastic member 19 is connected between the piston plate 18 and the hollow plate 16; a reversing roller 20 parallel to the horizontal shaft 3 is rotatably installed inside the tunnel, and a rope 21 is connected between the horizontal shaft 3 and the piston plate 18, and the rope 21 is in contact with the reversing roller 20. In this way, when the horizontal shaft 3 rotates, it will drive the rope 21, and the rope 21 pulls the piston plate 18, stretching the elastic member 19. External air enters the hollow plate 16 from the air vent of the gas guide plate 17. After the flap 4 and the horizontal shaft 3 quickly reverse and reset, the rope 21 quickly enters the slack state, and the piston plate 18 is reset under the action of the elastic member 19. During the reset process of the piston plate 18, the air in the gas guide plate 17 is squeezed out from the air vent. Since the width of the air vent is small, the reset speed of the piston plate 18 is slow (the piston plate 18 resets later than the flap 4, that is, when the mud cake moves onto the flap 4, the piston plate 18 is still in the reset process). In this way, when the air in the gas guide plate 17 flows out from the air vent at a high speed, it blows towards the contact position between the mud cake and the fabric belt, accelerating the drying speed of the contact surface between the two and further promoting their separation.

[0053] Only some exemplary embodiments of the present invention have been described by way of illustration above. Without doubt, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of the claims of the present invention.

Claims

1. A method for drying sludge by microwave pyrolysis, characterized in that: The following steps are involved: Step 1: Reduce the moisture content of the sludge by mechanical dehydration, and then screen out the lumps; Step 2: squeeze the sludge and evenly spread it on the microwave cloth belt; Step 3: The cloth belt passes through the tunnel microwave generator, and the sludge is heated and dried by microwaves; Step 4: Separate the dried sludge from the fabric belt and collect the sludge; The tunnel-type microwave generator used in step 3 comprises a guide roller (1) and a pressure roller (2) which are installed in the tunnel in a horizontal direction and rotate, the guide roller (1) and the pressure roller (2) being parallel to each other and perpendicular to the conveying direction of the fabric belt; the guide roller (1) is in contact with the lower surface of the conveying portion of the fabric belt, so that the fabric belt forms an inclined section, and the pressure roller (2) is located behind the guide roller (1) and in contact with the upper surface of the conveying portion of the fabric belt, so that the fabric belt forms an arc section which is closely fitted with the guide roller (1); A horizontal shaft (3) parallel to the pressure roller (2) is rotatably mounted at a position above the pressure roller (2) in the tunnel, a flap (4) parallel to its axis is fixedly mounted on the horizontal shaft (3), and an L-shaped supporting plate (5) is fixedly mounted on one side surface of the flap (4); in an initial state, the upper surface of the flap (4) is flush with the upper surface of the inclined section of the fabric belt.

2. The method for drying sludge by microwave pyrolysis according to claim 1, characterized in that: The surface of the pressure roller (2) is provided with an anti-slip groove, an incomplete gear (6) is fixedly mounted on the end of the pressure roller (2), a complete gear (7) is fixedly mounted on the end of the horizontal shaft (3), a torsion spring is connected between the horizontal shaft (3) and the side wall of the tunnel, and when the incomplete gear (6) and the complete gear (7) are in a separated state, the torsion spring keeps the horizontal shaft (3) and the flap (4) in an initial state.

3. The method for drying sludge by microwave pyrolysis according to claim 2, characterized in that: A plurality of rollers (8) are evenly mounted on the surface of the flap (4).

4. The method for drying sludge by microwave pyrolysis according to claim 3, characterized in that: The tunnel-type microwave generator further comprises an auxiliary roller (9) movably installed in the tunnel, wherein the auxiliary roller (9) is parallel to the horizontal axis (3) and can move horizontally relative to the horizontal axis (3).

5. The method for drying sludge by microwave pyrolysis according to claim 4, characterized in that: A first sector gear (10) is fixedly mounted on the end of the pressure roller (2), a second sector gear (11) is fixedly mounted on the end of the auxiliary roller (9), and a transmission gear (22) that cooperates with the first sector gear (10) is rotatably mounted on the outer wall of the tunnel; a protective shell (12) for protecting the incomplete gear (6), the complete gear (7), the first sector gear (10), the second sector gear (11) and the transmission gear (22) is fixedly mounted on the outside of the tunnel.

6. The method for drying sludge by microwave pyrolysis according to claim 5, characterized in that: A slider (13) is slidably mounted on the protective shell (12) in the horizontal direction, the auxiliary roller (9) and the slider (13) are rotationally matched and a torsion spring is connected between the two; a support seat is fixedly mounted on the protective shell (12), an elastic telescopic rod (14) is fixedly mounted on the support seat, and the end of the telescopic section of the elastic telescopic rod (14) is fixedly connected to the slider (13).

7. The method for drying sludge by microwave pyrolysis according to claim 6, characterized in that: The first sector gear (10) has an arc-shaped edge at the same distance from the axis of the pressure roller (2); the second sector gear (11) comprises a first part (1101) and a second part (1102); the first part (1101) has an arc-shaped edge at the same distance from the axis of the auxiliary roller (9); and the second part (1102) has an arc-shaped edge at the same distance from the axis of the auxiliary roller (9) that changes gradually from one end to the other.

8. The method for drying sludge by microwave pyrolysis according to claim 7, characterized in that: The auxiliary roller (9) has a circular cross section, and the distance between the auxiliary roller (9) and the upper surface of the inclined section of the fabric belt is the same as the thickness of the mud cake; a strip-shaped protrusion (15) is fixedly mounted on the circumferential surface of the auxiliary roller (9), and the cross section of the protrusion (15) is crescent-shaped.

9. The method for drying sludge by microwave pyrolysis according to claim 8, characterized in that: A hollow plate (16) is fixedly installed inside the tunnel of the tunnel-type microwave generator, and an air guide plate (17) communicating with the interior of the hollow plate (16) is fixedly installed at one end of the hollow plate (16), and the air vent of the air guide plate (17) is strip-shaped and faces the connection between the inclined section of the fabric belt and the arc section of the fabric belt.

10. The method for drying sludge by microwave pyrolysis according to claim 9, characterized in that: A piston plate (18) is slidably installed in the hollow plate (16), and an elastic member (19) is connected between the piston plate (18) and the hollow plate (16); a reversing roller (20) parallel to the horizontal axis (3) is rotatably installed in the tunnel, and the horizontal axis (3) and the piston plate (18) are connected by a rope (21), and the rope (21) is in contact with the reversing roller (20).

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