A microwave pyrolysis and drying method for sludge

Abstract

The present invention discloses a method for drying sludge by microwave pyrolysis, which relates to the field of sludge treatment technology and includes the following steps: Step 1: reducing the moisture content of the sludge by mechanical dehydration, and then screening out lumps; Step 2: squeezing the sludge and evenly laying it on a microwave cloth belt; Step 3: the cloth belt passes through a tunnel-type microwave generator, and the sludge is heated and dried by microwaves; Step 4: separating the dried sludge from the cloth belt and collecting the sludge; wherein the tunnel-type microwave generator used in Step 3 includes a guide roller and a pressure roller, wherein the guide roller contacts the lower surface of the cloth belt conveyor portion, forming an inclined section of the cloth belt, and the pressure roller is located behind the guide roller and contacts the upper surface of the cloth belt conveyor portion, forming an arc-shaped section that closely fits the guide roller. In the present invention, the flap does not need to contact the cloth belt, thereby avoiding scratches on the conveyor belt surface.

Description

Technical Field

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

[0002] With the acceleration of global industrialization and urbanization, the amount of sludge produced has shown an exponential growth. As a by-product of the sewage treatment process, the treatment and disposal of sludge has increasingly attracted widespread attention from all walks of life. 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 attracted attention. Sludge drying refers to the removal of moisture from sludge to a certain moisture content for subsequent utilization or disposal. Microwave heating technology uses the electromagnetic field of microwaves to cause polar molecules such as water molecules inside the heated object to vibrate at high frequencies, and the friction between molecules generates heat, thereby achieving rapid heating and drying. The application of microwave technology in sludge drying treatment is mainly to achieve rapid sludge drying through microwave heating.

[0003] Chinese utility model patent publication number CN204675978U discloses a microwave sludge dryer, comprising: 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 microwaves emitted by the microwave action cavity dry the sludge conveyed by the sludge conveyor belt; a steam discharge device is installed on the top of the microwave action cavity for discharging the steam generated by the sludge drying to the outside.

[0004] Chinese invention patent publication number CN115893786B discloses a microwave pyrolysis sludge drying system and device, comprising a water vapor recovery device, a microwave pyrolysis drying device, a pyrolysis residue recovery device, and an oil and gas recovery device interconnected by pipelines. The microwave pyrolysis drying device is provided with a microwave reaction chamber and a crushing chamber interconnected, and the microwave reaction chamber is provided with two compression zones.

[0005] In the traditional microwave drying process, the sludge is evenly coated on the surface of the conveyor belt. The sludge layer is very thin, allowing the moisture in the sludge to fully evaporate. However, this method easily generates a large amount of dust when the sludge is removed from the conveyor belt due to the thinness of the dried sludge layer, and the dried sludge tends to scatter during the collection process. Therefore, the sludge is generally pressed into a cake shape and then placed on the surface of the conveyor belt. The thickness of the cake is approximately 2-3 cm, and there is a certain distance between adjacent cakes. After drying, the thickness of the cake decreases, but it still maintains the cake shape, making it easier for operators to separate it from the conveyor belt and collect it. However, due to the thickness of the cake, the moisture in the lower layer is not easily dissipated. Therefore, the cake needs to be turned over by a flap during the drying process. Each time the flap is turned over, it contacts the surface of the conveyor belt and generates mutual compression force. Long-term operation will scratch the conveyor belt surface. Summary of the Invention

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

[0007] In order to achieve the above object, the present invention provides the following technical solution: a microwave pyrolysis and drying sludge method, 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: squeeze the sludge and evenly spread it on the microwave cloth belt;

[0010] Step 3: The fabric belt passes through the tunnel microwave generator, and the microwaves heat and dry the sludge;

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

[0012] Among them, the tunnel-type microwave generator used in step three includes a guide roller and a pressure roller installed in the tunnel in a horizontal direction, the guide roller and the pressure roller are parallel to each other and perpendicular to the conveying direction of the fabric belt; the guide roller contacts the lower surface of the conveying portion of the fabric belt, so that the fabric belt forms an inclined section, and the pressure roller is located behind the guide roller and contacts the upper surface of the conveying portion of the fabric belt, so that the fabric belt forms an arc section that is closely fitted with the guide roller.

[0013] A horizontal axis parallel to the pressure roller is also rotatably installed at the position above the pressure roller in the tunnel, and a flap parallel to its axis is fixedly installed on the horizontal axis, and an L-shaped support plate is fixedly installed on one side surface of the flap; in the initial state, the upper surface of the flap is flush with the upper surface of the inclined section of the fabric belt.

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

[0015] As a preferred technical solution of the present invention, a plurality 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, wherein the auxiliary roller is parallel to the horizontal axis and can move horizontally relative to the horizontal axis.

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

[0018] As a preferred technical solution of the present invention, a slider is installed on the protective shell in a horizontal sliding direction, the auxiliary roller and the slider rotate in cooperation 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 distance between the arc edge of the first sector gear and the axis of the pressure roller is the same; the second sector gear includes a first part and a second part, the distance between the arc edge of the first part and the axis of the auxiliary roller is the same, and the distance between the arc edge of the second part and the axis of the auxiliary roller gradually changes from one end to the other.

[0020] As a preferred technical solution of the present invention, the cross-section of the auxiliary roller is circular, and the distance between the auxiliary roller 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 is 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, and an air guide plate connected to the interior thereof is fixedly installed at one end of the hollow plate, and the air vent of the air guide plate is strip-shaped and faces the connection between the inclined section of the fabric belt and the arc section of the fabric belt.

[0022] As a preferred technical solution of the present invention, a piston plate is slidably installed in the hollow plate, and an elastic part 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 the horizontal axis and the piston plate are connected by a rope, and the rope is in contact with the reversing roller.

[0023] In the above technical scheme, the present invention provides a microwave pyrolysis and drying method for sludge. During the microwave drying of the mud cake, the cloth belt is formed into an inclined section and an arc section through the cooperation of the guide roller and the pressure roller. After the mud cake on the cloth belt follows the cloth belt to move to the intersection of the inclined section and the arc section, it will be translated onto the flip plate under the action of its own inertia and turned over under the action of the flip plate. In the above process, on the one hand, the tensile deformation of the cloth belt when it is transformed from the inclined section to the arc section is utilized to separate it from the bottom surface of the mud cake. On the other hand, the inertia of the mud cake itself is used to separate it from the cloth belt, and the flip plate does not need to contact the cloth belt, thereby avoiding scratches on the surface of the conveyor belt.

[0024] In addition, the present invention is also provided with an auxiliary roller, which can automatically assist the mud cake to move onto the flap, and during the flipping process of the flap, the auxiliary roller can automatically avoid interference with the flap. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0026] Figure 1 Schematic diagram of the three-dimensional structure of the tunnel type microwave generator in the embodiment;

[0027] Figure 2 for Figure 1 A magnified schematic diagram of point A in the middle;

[0028] Figure 3 Schematic diagram of the internal structure of the tunnel type microwave generator in the embodiment;

[0029] Figure 4 for Figure 3 A magnified schematic diagram of point B in the middle;

[0030] Figure 5 Schematic diagram of the working state of the incomplete gear and the complete gear in the embodiment;

[0031] Figure 6 for Figure 5 Enlarged schematic diagram of point C in the middle;

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

[0033] Figure 8 for Figure 7 Enlarged schematic diagram of point D in the middle.

[0034] Description of reference numerals:

[0035] 1. Guide roller; 2. Pressure roller; 3. Horizontal axis; 4. Flap; 5. Support 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. Slider; 14. Elastic telescopic rod; 15. Protrusion; 16. Hollow plate; 17. Air guide plate; 18. Piston plate; 19. Elastic part; 20. Reversing roller; 21. Rope; 22. Transmission gear. DETAILED DESCRIPTION

[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] This embodiment provides a method for drying sludge by microwave pyrolysis, comprising 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: squeeze the sludge and evenly spread it on the microwave cloth belt;

[0040] Step 3: The fabric belt passes through the tunnel microwave generator, and the microwaves heat and dry the sludge;

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

[0042] Among them, step three adopts Figure 1 The tunnel type microwave generator shown in the figure comprises a tunnel, wherein a number of microwave instruments and flared suction pipes are evenly installed inside the tunnel along the conveying direction of the fabric belt, an exhaust pipe is installed on the top of the tunnel, and a guide roller 1 and a pressure roller 2 are installed in the tunnel along the horizontal direction. The guide roller 1 and the pressure roller 2 are parallel to each other and perpendicular to the conveying direction of the fabric belt; the fabric belt is driven by a transmission wheel, and the squeezed mud cake falls on the fabric belt and enters the tunnel synchronously with the fabric belt; the upper part of the fabric belt contacts the mud cake and is the conveying part; the guide roller 1 contacts the lower surface of the conveying part of the fabric belt, so that the fabric belt forms Figure 3 In the inclined section, the pressure roller 2 is located behind the guide roller 1 and contacts the upper surface of the conveying portion of the fabric belt, so that the fabric belt forms Figure 3The arc section fits tightly against the guide roller 1. In this way, the cloth belt will produce a certain tensile deformation at the moment of changing from the inclined section to the arc section, which will cause the bottom surface of the mud cake to separate from it during the deformation process; then, the cloth belt will reverse after changing from the inclined section to the arc section, and the mud cake will move in the original direction under the action of inertia.

[0043] like Figure 4 As shown, a horizontal shaft 3 parallel to the pressure roller 2 is rotatably installed at the position above the corresponding pressure roller 2 in the tunnel, and a flap 4 parallel to its axis is fixedly installed on the horizontal shaft 3, and an L-shaped supporting 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, and 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, so that the mud cake can move more easily relative to the flap 4.

[0044] Specific Figure 4 In the initial state, after the mud cake on the inclined section of the cloth belt is separated from the cloth belt, it moves onto the flap 4 under the guidance of the flap 4; then, the flap 4 flips clockwise with a flip angle of 220 degrees. After flipping into place, the mud cake on the flap 4 falls back onto the cloth belt under the action of gravity, and the mud cake is turned over in this process; after the mud cake is separated from the flap 4, the flap 4 rotates counterclockwise to reset to Figure 4 The initial state is shown and the above process is repeated.

[0045] It can be seen from the above process that in this embodiment, when the mud cake is separated from the fabric belt, 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] like Figure 6 As shown, the surface of the pressure roller 2 is provided with an anti-slip groove 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 by the friction force; 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, and 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 keeps the horizontal shaft 3 and the flap 4 in a Figure 4 In the initial state shown, both the incomplete gear 6 and the complete gear 7 are located outside the tunnel.

[0047] Specifically, Figure 4 and Figure 6For example, when the fabric belt moves, the pressure roller 2 and the incomplete gear 6 will continue to rotate. When the incomplete gear 6 and the complete gear 7 enter the meshing state, the complete gear 7 will rotate clockwise under the drive of the incomplete gear 6, and the horizontal shaft 3 and the flap 4 will also rotate clockwise synchronously, thereby turning the mud cake over and deforming the torsion spring; after the mud cake is separated from the flap 4, the complete gear 7 will also be disengaged from the incomplete gear 6, and the horizontal shaft 3, the flap 4 and the complete gear 7 will quickly reverse counterclockwise under the action of the torsion spring to reset to Figure 4 The state shown. In this way, the flap 4 can automatically flip the mud cake conveyed by the cloth belt. When the cloth belt conveys at a high speed, the time required for the flap 4 to operate once is also shortened, thereby enabling adaptive operation according to the cloth belt conveying speed. In actual production, sludge with different moisture contents requires different drying times, and the cloth belt conveying speed also varies. The present invention can well adapt to this actual production demand.

[0048] like Figure 4 As 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 axis 3 and can move horizontally relative to the horizontal axis 3; specifically, when the flap 4 is in Figure 4 In the initial state, the auxiliary roller 9 rotates counterclockwise to push the upper surface of the mud cake, promoting the mud cake to move onto the flip plate 4; when the mud cake moves onto the flip plate 4, the auxiliary roller 9 moves horizontally to the left for a distance to make space, so that the flip plate 4 can drive the mud cake to flip without interfering with the auxiliary roller 9.

[0049] like Figure 1 、 Figure 2 and Figure 8As shown, the end of the pressure roller 2 is also fixedly sleeved with a first sector gear 10, and the first sector gear 10 is staggered with the incomplete gear 6 so that the two will not interfere with each other. The end of the auxiliary roller 9 is fixedly mounted with a second sector gear 11; the first sector gear 10 and the second sector gear 11 are both located outside the tunnel; 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 outside the tunnel; a slider 13 is slidably mounted on the protective shell 12 in the horizontal direction, and the auxiliary roller 9 and the The slider 13 rotates together 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, and the end of the telescopic section of the elastic telescopic rod 14 is fixedly connected to the slider 13; the arcuate edge of the first sector gear 10 is at the same distance from the axis of the pressure roller 2; the second sector gear 11 includes a first part 1101 and a second part 1102, and one side edge of the first part 1101 and the second part 1102 coincides, and the arcuate edge of the first part 1101 is at the same distance from the axis of the auxiliary roller 9, and the distance between the second part 1102 and the axis of the auxiliary roller 9 gradually changes from one end to the other.

[0050] Specifically, Figure 4 and Figure 8For example, when the pressure roller 2 drives the incomplete gear 6 and the first sector gear 10 to rotate continuously, the first sector gear 10 and the transmission gear 22 enter into a meshing state, and the transmission gear 22 first enters into a meshing state with the first part 1101, so that the second sector gear 11 and the auxiliary roller 9 rotate counterclockwise, and the auxiliary roller 9 assists in pushing the mud cake, and the torsion spring between the auxiliary roller 9 and the slider 13 is deformed; then, the transmission gear 22 enters into a meshing state with the second part 1102. Since the arcuate side 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 will also translate, and the elastic telescopic rod 14 will be Compress until the transmission gear 22 is disengaged from the first sector gear 10; before the transmission gear 22 is disengaged from the first sector gear 10, the incomplete gear 6 and the complete gear 7 enter the meshing state, that is, during the translation of the auxiliary roller 9, the flap 4 has begun to drive the mud cake to rotate clockwise. When the flap 4 and the mud cake rotate to a certain angle, the transmission gear 22 is disengaged from the first sector gear 10, and the elastic telescopic rod 14 causes the slider 13, the auxiliary roller 9 and the second sector gear 11 to translate in the opposite 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 its initial state; it should be noted that when the flap 4 is reversed and reset, since the mud cake has been separated from the flap 4, there will be no interference between the flap 4 and the auxiliary roller 9. To sum up, in this embodiment, the auxiliary roller 9 is used to assist in pushing the mud cake to ensure that the mud cake can be moved onto the flip plate 4, and after the pushing is completed, the auxiliary roller 9 can automatically translate a short distance to make room for the mud cake to flip. After the mud cake flips to a certain angle, the auxiliary roller 9 can automatically reset to prepare for the next mud cake push.

[0051] In the actual processing process, although the pressure roller 2 is provided with anti-slip grooves on its surface and there is a strong squeezing force between it and the fabric belt, it is impossible to completely avoid the pressure roller 2 from slipping. Once the pressure roller 2 slips, the rhythm of the entire conveying process will be affected. To address this problem, this embodiment also has the following design; Figure 4As shown, 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 circumference of the auxiliary roller 9. The protrusion 15 has a crescent-shaped cross-section. In the initial state, the protrusion 15 faces the fabric belt, blocking the mud cake. Therefore, even if the pressure roller 2 slips, that is, the flap 4 fails to reverse and reset to its initial state in time, the mud cake will not move to the curved section of the fabric belt. Only when the pressure roller 2 drives the first sector gear 10 to rotate and mesh 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 follow the fabric belt toward the flap 4. This avoids the situation where the flap 4 fails to reset in time due to the slipping of the pressure roller 2, causing the mud cake to follow the fabric belt to the curved section.

[0052] like Figure 4 As shown, a hollow plate 16 is fixedly installed inside the tunnel of the tunnel-type microwave generator, and an air guide plate 17 connected to the interior thereof is fixedly installed at one end of the hollow plate 16. 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, and the width of the air vent does not exceed 1 mm; 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. In this way, when the horizontal shaft 3 rotates, it will drive the rope 21, and the rope 21 will pull the piston plate 18, causing the elastic member 19 to stretch, and the external air will enter the hollow plate 16 from the vent of the air guide plate 17. After the flap 4 and the horizontal shaft 3 are quickly reversed and reset, the rope 21 quickly enters a relaxed 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 air guide plate 17 is squeezed out from the vent. Since the width of the vent is small, the reset speed of the piston plate 18 is slow (the piston plate 18 is reset 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, during the high-speed outflow of the air in the air guide plate 17 from the vent, it is blown to the contact position of the mud cake and the fabric belt, which accelerates the drying speed of the contact surface between the two, further promoting the separation of the two.

[0053] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

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 fabric belt passes through the tunnel microwave generator, and the microwaves heat and dry the sludge; Step 4: Separate the dried sludge from the fabric belt and collect the sludge; The tunnel-type microwave generator used in step 3 includes a guide roller (1) and a pressure roller (2) which are installed in the tunnel in a horizontal direction and rotated therein, wherein the guide roller (1) and the pressure roller (2) are parallel to each other and perpendicular to the conveying direction of the fabric belt; the guide roller (1) contacts 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 contacts the upper surface of the conveying portion of the fabric belt, so that the fabric belt forms an arc section that 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 corresponding 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 microwave pyrolysis drying sludge method 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 microwave pyrolysis drying sludge method according to claim 2, characterized in that: A plurality of rollers (8) are evenly mounted on the surface of the flap (4).

4. The microwave pyrolysis drying sludge method 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 microwave pyrolysis drying sludge method 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; and a protective shell (12) is fixedly mounted on the outside of the tunnel 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).

6. The microwave pyrolysis drying sludge method according to claim 5, characterized in that: A slider (13) is mounted on the protective shell (12) so as to slide 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. The end of the telescopic section of the elastic telescopic rod (14) is fixedly connected to the slider (13).

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

8. The microwave pyrolysis drying sludge method according to claim 7, characterized in that: 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.

9. The microwave pyrolysis drying sludge method 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 thereof. 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 microwave pyrolysis drying sludge method 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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