A kiln co-processing municipal sludge device and a sludge treatment method

Abstract

The application discloses a kiln collaborative disposal of municipal sludge device and sludge treatment method, belongs to the field of sludge treatment. The kiln collaborative disposal of municipal sludge device, including tunnel kiln, sludge drying furnace, heat collector, feeding device, discharging device, the opening is set in the upper portion of the brick opening section of the tail cooling zone of the tunnel kiln, the sludge drying furnace is rotatably arranged above the opening, a first sealing chamber is sealingly arranged between the outer side of the sludge drying furnace and the opening, and the first sealing chamber is communicated with the tunnel kiln; the sludge drying furnace comprises an outer rotating drum and an inner rotating drum, the inner rotating drum and the outer rotating drum are provided with flow guide helical blades with opposite rotation directions, the sludge inlet and the sludge outlet of the sludge drying furnace are located at the same end; the sludge outlet end of the sludge drying furnace is provided with a closed structure for separating the sludge outlet from the ambient air, the tail end of the heat collector is correspondingly connected with the inner rotating drum of the sludge drying furnace, and the exhaust port of the sludge drying furnace is connected with the exhaust treatment equipment through an air duct and a fan.

Description

Technical Field

[0001] This invention relates to the field of sludge treatment technology, and in particular to a kiln-co-processing device for municipal sludge. This invention also relates to a sludge treatment method using the aforementioned kiln-co-processing device for municipal sludge. Background Technology

[0002] Currently, the brick-making industry utilizes the waste heat from tunnel kilns to dry sludge discharged from urban wastewater treatment plants. The dried sludge is then mixed into the raw materials for brick making in a certain proportion. The calorific value of the organic matter in the sludge is used as part of the fuel for sintering the bricks, while the residue serves as raw material for brick making, thus achieving the resource utilization of sludge. This co-processing technology of "waste heat drying—blending and brick making" has been recognized as a relatively advanced and environmentally friendly approach to urban sludge treatment.

[0003] Existing technologies mainly use mesh belt drying chambers or floor-mounted drying chambers as sludge drying equipment, but their structures have the following shortcomings:

[0004] 1) Low waste heat utilization rate: Traditional drying chambers have a long recovery path for waste heat from the brick outlet section of the tunnel kiln and poor heat exchange efficiency, resulting in a large amount of heat energy being wasted as the flue gas or kiln body dissipates heat.

[0005] 2) The heating air system is complex and energy-intensive: In order to achieve sludge drying, a high-power blower and supporting pipe network need to be installed, which increases equipment investment and operating power consumption.

[0006] 3) The equipment occupies a large area and has high maintenance costs: The mesh belt or floor heating structure needs to be set up independently, resulting in a dispersed production line layout. The mesh belt is prone to clogging and the floor heating is prone to accumulating mud, resulting in a large amount of cleaning work.

[0007] 4) Poor drying uniformity: The hot air is unevenly distributed in the drying chamber, causing some sludge to become too dry and coke, and some to have a high moisture content, which affects the stability of subsequent brick firing. Summary of the Invention

[0008] The purpose of this invention is to provide a kiln co-processing device and method for urban sludge, in order to solve the problems of low waste heat utilization rate, complex heating air system, high energy consumption, large equipment footprint, high maintenance cost and poor drying uniformity of existing sludge drying equipment.

[0009] This invention is achieved through the following technical solution: a kiln-furnace co-processing device for municipal sludge, comprising a tunnel kiln, a rotary sludge drying furnace, a heat collector, a feeding device, and a discharging device. An opening is provided at the upper part of the cooling zone at the tail of the tunnel kiln, and the sludge drying furnace is rotatably mounted above the opening. A first sealed chamber communicating with the tunnel kiln is sealed between the outer side of the sludge drying furnace and the opening. The sludge drying furnace includes an outer rotary cylinder and an inner rotary cylinder coaxially arranged, which are fixedly connected together by several tubular support frames. The outer ends of the support frames penetrate the wall of the outer rotary cylinder, allowing their pipe holes to communicate with the outside. Several guide spiral blades are provided on the inner walls of both the inner and outer rotary cylinders, with the guide spiral blades rotating in opposite directions. The sludge inlet and sludge outlet are both located at one end of the sludge drying furnace. The sludge inlet is located at the end of the inner rotating drum, and the sludge outlet is located between the inner and outer rotating drums. The other end of the outer rotating drum is fixedly connected to an end plate II with a waste gas port in the middle. There is a gap between the end plate II and the adjacent end of the inner rotating drum. The sludge outlet of the sludge drying furnace is equipped with a closed structure that isolates the sludge outlet from the outside air. The heat collector is fixedly installed at the brick outlet end of the tunnel kiln. The tail end of the heat collector corresponds to the inner rotating drum at the feed end of the sludge drying furnace. The waste gas port of the sludge drying furnace is connected to the waste gas treatment equipment through the air duct and the fan. The feed pipe of the feeding device passes through the heat collector wall and enters the sludge inlet at the end of the inner rotating drum. The discharge device is set corresponding to the sludge outlet of the sludge drying furnace.

[0010] In this invention, the sludge drying furnace is rotatably positioned above the opening at the tail end of the tunnel kiln, with a high-temperature brick stack below. The sludge drying furnace can directly absorb the radiant and convective heat from the brick stack at close range, improving heat utilization efficiency. A first sealed chamber, located between the outer side of the sludge drying furnace and the opening, allows the sludge drying furnace and the high-temperature brick stack inside the tunnel kiln to be in the same high-temperature sealed chamber. The high-temperature waste heat inside the tunnel kiln can be directly utilized by the sludge drying furnace over a short distance, resulting in high heat utilization efficiency. The outer and inner rotating cylinders of the sludge drying furnace are fixed together by a tubular support frame, with the outer end of the support frame penetrating the wall of the outer rotating cylinder, allowing its pipe holes to communicate with the outside. The high-temperature gas and radiation inside the tunnel kiln can directly contact the inner rotating cylinder through the pipe holes of the support frame, heating the inner rotating cylinder and improving thermal efficiency. A heat collector is used to collect waste heat at the brick outlet of the tunnel kiln and guide it into the sludge drying furnace. The function of the guide spiral blades installed in the outer and inner rotating drums of the sludge drying furnace is to guide the sludge in the drums to move forward continuously during the rotation of the sludge drying furnace, and at the same time tumble the sludge, increasing the contact between the sludge and the hot air in the drums, thereby improving the drying uniformity and drying speed. The guide spiral blades in the inner and outer rotating drums are set in opposite directions, causing the sludge to move back and forth in the sludge drying furnace, which increases the drying time and drying distance per unit of raw material. In operation, the feeding device transports sludge to the inner rotating drum of the sludge drying furnace through the discharge pipe. As the sludge drying furnace rotates, the sludge moves continuously away from the sludge inlet under the action of the guide spiral blades in the inner rotating drum and falls into the outer rotating drum from the end of the inner rotating drum. Then, under the action of the guide spiral blades in the outer rotating drum, it continues to move in the opposite direction towards the sludge outlet as the sludge drying furnace rotates, and finally enters the discharge device through the sludge outlet. During the movement of the sludge in the sludge drying furnace, the high-temperature gas and high-temperature radiation in the tunnel kiln heat the inner and outer rotating drums of the sludge drying furnace from the outside. At the same time, the high-temperature waste heat air from the tunnel kiln outlet is sent into the inner rotating drum by the heat collector. Forced ventilation in the rotating drum fully contacts the sludge, removes moisture, and thus achieves sludge drying.

[0011] Furthermore, to prevent sludge from adhering to the rotating drum wall and the guide spiral blades, several gravity hammers are suspended from the inner wall of both the inner and outer rotating drums of the sludge drying furnace. The density of these gravity hammers gradually decreases along the path from feed to discharge. When the sludge drying furnace rotates, the gravity hammers strike the rotating drum wall and guide spiral blades, preventing sludge from adhering to these surfaces.

[0012] Furthermore, both the feeding and discharging devices are screw conveyors.

[0013] Furthermore, to improve sealing, a sealing structure is provided between the first sealing chamber and the outer wall of the sludge drying furnace. The sealing structure includes two annular protrusions fixedly disposed on the outer surface of the outer rotating drum of the sludge drying furnace and a sealing ring that cooperates with the annular protrusions. The sealing ring and the annular protrusions form a labyrinth seal.

[0014] Furthermore, the outer end of the sealing ring is provided with a flexible asbestos strip to form a contact seal with the outer surface of the outer rotating cylinder of the sludge drying furnace.

[0015] Furthermore, the enclosed structure is an end plate I that is sealed between the inner and outer rotating cylinders at the discharge end of the sludge drying furnace. The end plate I is provided with a sludge discharge port and a gravity door that can be opened or closed by gravity.

[0016] Furthermore, a gravity door guide groove is provided on end plate I, and the gravity door slides in conjunction with the gravity door guide groove.

[0017] Furthermore, four sludge discharge ports are evenly distributed along the circumference of end plate I, and each sludge discharge port is equipped with a gravity gate.

[0018] Furthermore, the closed structure is a second sealing chamber located outside the discharge end of the sludge drying furnace. The second sealing chamber seals the discharge end of the sludge drying furnace inside its interior, and the outer rotating cylinder and the inner rotating cylinder of the discharge end of the sludge drying furnace form an open structure to form the sludge discharge port.

[0019] This invention also provides a sludge treatment method for the aforementioned kiln-co-processing urban sludge device. The technical solution adopted is as follows: sludge particles are fed into the inner rotating drum of the sludge drying furnace through a feeding device. During the rotation of the sludge drying furnace, they are tumbled and moved forward by the action of the guide spiral blades in the inner rotating drum. They fall into the outer rotating drum at the end of the inner rotating drum, and then move in the opposite direction to the discharge end by the action of the guide spiral blades in the outer rotating drum, and enter the discharge device through the sludge discharge port. During the movement of the sludge particles in the sludge drying furnace, on the one hand, the heat emitted by the high-temperature brick stacks in the tunnel kiln enters the first sealed chamber to heat the sludge drying furnace from the outside. On the other hand, the residual heat of the tunnel kiln is introduced into the interior of the sludge drying furnace through forced ventilation to contact the sludge particles and remove moisture, thereby achieving sludge drying.

[0020] The beneficial effects of this invention are as follows: By rotating and mounting the sludge drying furnace above the opening at the brick outlet section of the tunnel kiln, and placing it in the same sealed, insulated space as the high-temperature brick stack, the sludge drying furnace can directly absorb the radiant and convective heat from the high-temperature brick stack below at close range. This eliminates the need for long-distance hot air transport, allowing the radiant and convective heat emitted by the brick stack to be absorbed instantly by the rotating drum wall, greatly improving heat utilization. Through the specially designed sludge drying furnace, sludge particles can reciprocate within a certain length of the furnace, effectively increasing the drying time and distance per unit of raw material. Furthermore, the tumbling action of the guide spiral blades effectively increases the contact opportunities between the sludge particles and the heat source, improving drying uniformity and efficiency. The tubular support frame design between the outer and inner rotating drums of the sludge drying furnace allows the high-temperature gas inside the tunnel kiln to... High-temperature radiation directly contacts the inner drum through the pipe holes of the support frame, heating the inner drum and greatly improving its heating effect, further enhancing drying uniformity and efficiency. Simultaneously, forced ventilation within the drum ensures full contact with the sludge, rapidly removing moisture. Heat is transferred from the bricks, drum wall, and sludge in one step, minimizing heat loss and significantly improving waste heat utilization. A fan directly draws hot, dry air from above the brick stack into the drum, requiring only one fan to simultaneously perform heat absorption, dehumidification, and air supply functions. This eliminates the need for high-powered fans and lengthy piping required by traditional mesh belt or pit systems, reducing the number of devices and significantly lowering power consumption. Furthermore, a gravity hammer built into the drum continuously strikes the drum wall during rotation, effectively preventing sludge adhesion, ensuring uniform drying, and reducing the frequency of downtime for cleaning. The device of this invention has a compact structure and can replace the existing large-area mesh belt drying chamber or floor drying chamber, which can save on civil engineering investment and make maintenance more convenient. At the same time, the hot and humid exhaust gas is centrally drawn out by the same fan and can be directly connected to the subsequent condensation tower and deodorization device to achieve "centralized collection and centralized treatment". This avoids the unorganized dispersion caused by traditional multi-point exhaust, further reducing the odor and dust emissions in the factory area. The overall environmental protection level is better than the existing technology. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the kiln co-processing urban sludge device in Example 1;

[0022] Figure 2 yes Figure 1 An enlarged view of the right side of the middle section;

[0023] Figure 3 This is an enlarged schematic diagram showing the connection between the tubular support frame and the inner and outer rotating drums in the sludge drying furnace.

[0024] Figure 4 This is a schematic diagram of a cross-section of a sludge drying furnace;

[0025] Figure 5This is a schematic diagram of the arrangement of the gravity gate in Example 1;

[0026] Figure 6 yes Figure 2 Enlarged schematic diagram of part B in the middle;

[0027] Figure 7 This is a schematic diagram of the feeding device;

[0028] Figure 8 This is a schematic diagram of the discharge device;

[0029] Figure 9 This is a schematic diagram of the kiln co-processing device for urban sludge in Example 2;

[0030] In the diagram, 1. Tunnel kiln, 2. Waste gas treatment tower, 3. Fan, 4. Air duct, 5. Sludge drying furnace, 6. First sealing chamber, 7. Feeding device, 8. Heat collector, 9. Discharge device, 10. Brick stack, 11. Sealing ring, 12. Asbestos belt, 13. Sealing chamber wall, 14. Second sealing chamber, 15. Brick cart, 16. Sludge, 17. Spherical sludge particles, 18. Dried spherical sludge particles;

[0031] 101. Opening;

[0032] 501. Drive mechanism; 502. Support wheel; 503. Inner rotating cylinder; 504. Outer rotating cylinder; 505. Gravity hammer; 506. Outer guide spiral blade; 507. Inner guide spiral blade; 508. Support frame; 509. End plate I; 510. Sludge discharge port; 511. End plate II; 512. Exhaust gas port; 513. Gravity gate; 514. Gravity gate guide groove; 515. Counterweight; 516. Annular boss.

[0033] 701. Feed pipe; 702. Feed inlet of feeding device;

[0034] 901. Arc-shaped funnel. Detailed Implementation

[0035] The invention will be further described below with reference to non-limiting embodiments and accompanying drawings.

[0036] Example 1

[0037] like Figures 1-8As shown, a kiln-furnace co-processing device for municipal sludge includes a tunnel kiln 1, a sludge drying furnace 5, a solar collector 8, a feeding device 7, and a discharging device 9. An opening 101 is provided above the brick outlet section of the cooling zone at the tail of the tunnel kiln. The sludge drying furnace 5 is a rotary type, rotatably mounted above the opening 101 by multiple support wheels 502. The support wheels 502 are installed on the flat surface of the tunnel kiln's top plate to support the sludge drying furnace 5 in circular motion. Support wheels 502 are provided at both ends of the sludge drying furnace 5 for support. A gear ring or large sprocket is provided on the outer side of the rotary drum of the sludge drying furnace 5. A drive mechanism 501 for driving the rotation of the sludge drying furnace 5 is located at the top of the tunnel kiln. The drive mechanism 501 includes a motor and a reduction gear. The output end of the reduction gear is provided with a drive gear or drive sprocket that meshes with the gear ring on the outer side of the rotary drum of the sludge drying furnace 5, or meshes with the large sprocket via a chain, thereby driving the sludge drying furnace 5 to rotate. A first sealed chamber 6, communicating with the tunnel kiln, is sealed between the outside of the sludge drying furnace 5 and the opening 101. Through the first sealed chamber 6, the sludge drying furnace 5 and the high-temperature brick stacks inside the tunnel kiln below are placed in the same sealed high-temperature space, allowing the sludge drying furnace 5 to directly absorb the radiant and convective heat from the brick stacks at close range. In this embodiment, the first sealed chamber 6 is formed by the inner sides of the support wheels 502 at both ends of the sludge drying furnace 5 (at the edge of the kiln top opening) and the two side walls of the rotating drum of the sludge drying furnace 5, with the top closed, creating a sealed high-temperature chamber. The high-temperature waste heat can be directly utilized by the rotating drum over a short distance, resulting in a very high heat utilization rate.

[0038] The sludge drying furnace 5 includes an inner rotating cylinder 503 and an outer rotating cylinder 504 arranged coaxially. The inner rotating cylinder 503 and the outer rotating cylinder 504 are fixedly connected together by several hollow tubes as support frames 508. One end of the support frame 508 is welded to the cylinder wall of the inner rotating cylinder 503, and the other end (outer end) of the support frame 508 penetrates the cylinder wall of the outer rotating cylinder 504 and is welded to the outer rotating cylinder 504, so that its pipe hole communicates with the outside. High-temperature gas and high-temperature radiation in the tunnel kiln can directly reach the cylinder wall of the inner rotating cylinder through the pipe hole of the support frame 508 to heat the inner rotating cylinder. Several inner guide spiral blades 507 are provided on the inner wall of the inner rotating cylinder 503, and several outer guide spiral blades 506 are provided on the inner wall of the outer rotating cylinder 504. The inner guide spiral blades 507 and the outer guide spiral blades 506 rotate in opposite directions. The function of the inner guide spiral blade 507 and the outer guide spiral blade 506 is to guide the raw material inside the furnace during the rotation of the sludge drying furnace 5, moving it from one end to the other, and continuously turning the raw material during the movement. To prevent the raw material from sticking to the cylinder wall and the guide spiral blades, in this embodiment, several gravity hammers 505 are suspended and connected to the inner wall of the inner rotating cylinder 503 and the inner wall of the outer rotating cylinder 504 of the sludge drying furnace 5. The gravity hammers 505 are steel circular chain structures. When the cylinder rotates, they swing up and down under the action of gravity, which can remove the raw material sticking to the inner wall of the rotating cylinder and the guide spiral blades. Because the sludge raw material has the highest moisture content when it first enters the rotary drum, and then the moisture content gradually decreases as it goes through the drying process to the discharge end, the sludge with low moisture content will not stick to the wall. Therefore, the gravity hammers 505 are arranged in an orderly manner from dense to sparse according to the moisture content of the sludge particles in the drum. That is, the arrangement density of the gravity hammers gradually decreases along the path from feed to discharge. The sludge inlet and sludge outlet of the sludge drying furnace 5 are both located at one end of the sludge drying furnace 5, namely the right end. The sludge inlet is located at the right end of the inner rotating cylinder 503, and an annular baffle is fixedly installed at the right end of the inner rotating cylinder 503. The inner hole of the annular baffle is the sludge inlet, and the annular baffle can prevent the raw material from overflowing from the inner rotating cylinder. The sludge outlet is located between the inner rotating cylinder 503 and the outer rotating cylinder 504. To prevent cold air from entering the outer rotating cylinder and to ensure the stability of the drying environment inside the rotating cylinder, a sealing structure is provided at the sludge outlet end of the sludge drying furnace 5 to isolate the sludge outlet from the outside air. In this embodiment, the sealing structure is an end plate I 509 that is sealed between the inner rotating cylinder 503 and the outer rotating cylinder 504 at the outlet end of the sludge drying furnace.In this embodiment, the right end of the inner rotating cylinder 503 extends beyond the outer rotating cylinder 504. This extended portion is used to cooperate with the solar collector 8. The right end of the outer rotating cylinder 504 is sealed with an annular end plate I 509. The end plate I 509 is welded onto the inner rotating cylinder 503 and welded to it as a whole. The left end of the inner rotating cylinder 503 is shorter than the outer rotating cylinder 504. An end plate II 511 with a waste gas port 512 in the middle is fixedly connected to the left end of the outer rotating cylinder 504. There is a certain distance between the end plate II 511 and the adjacent end of the inner rotating cylinder. The space formed by this distance is the space for the raw material in the inner rotating cylinder to transfer to the outer rotating cylinder. The diameter of the waste gas port 512 is smaller than the diameter of the inner rotating cylinder 503, so that the end plate II 511 acts as a baffle to prevent the raw material from overflowing from the waste gas port into the outer rotating cylinder. A sludge discharge port 510 is located on end plate I 509. A gravity gate 513 is provided at the sludge discharge port 510, which can be opened or closed by gravity. Gravity gate guide grooves 514 are respectively provided on both sides of the sludge discharge port on end plate I 509. The gravity gate 513 slides in conjunction with the gravity gate guide grooves 514. To ensure smooth opening and closing of the gravity gate, a counterweight block 515 is also provided on the gravity gate. The number of sludge discharge ports 510 is set as needed. Preferably, four sludge discharge ports 510 are evenly distributed along the circumference of end plate I 509, and each sludge discharge port is provided with one gravity gate 513. The opening and closing process of the gravity gate is as follows: the dried sludge particles accumulate at the 6 o'clock position directly below the rotating drum, where the sludge outlet 510 is open, and the dried sludge particles flow out from the sludge outlet 510 and fall into the hopper of the discharge device 9. When the rotating drum rotates 90 degrees clockwise to the 9 o'clock position, the gravity gate, under the action of its own weight and the counterweight, moves down along the gravity gate guide groove to close the sludge outlet. When the rotating drum rotates to the 12 o'clock position, the gravity gate is still closed, effectively preventing the entry of external cold air. When the rotating drum rotates to the 3 o'clock position, the gravity gate will open along the gravity gate guide groove under the action of its own weight and the counterweight until it rotates to the 6 o'clock position, where the gravity gate is still open, and the dried sludge particles flow out. This rotation cycle ensures that the dried sludge particles can flow out smoothly while maintaining a stable drying environment inside the rotating drum.

[0039] The solar collector 8 is fixedly installed at the brick outlet end of the tunnel kiln. The collecting port end of the solar collector 8 is located above the brick outlet of the tunnel kiln. The tail end of the solar collector 8 is fitted together with the extended part of the inner rotating cylinder at the feed end of the sludge drying furnace 5 without contact, so as not to affect the rotation of the rotating cylinder. The waste heat air from the brick outlet of the tunnel kiln can enter the inner rotating cylinder 503 through the solar collector 8, carrying away a large amount of moisture from the sludge inside the inner rotating cylinder. The exhaust port 512 of the sludge drying furnace is connected to the exhaust gas treatment tower 2 through the air duct 4 and the fan 3. The fan 3 can create forced ventilation inside the rotating cylinder, so that the hot air comes into full contact with the sludge inside the rotating cylinder, and the moisture inside the rotating cylinder is quickly carried away, improving the sludge drying efficiency.

[0040] The feeding device 7 is located at the feed end of the sludge drying furnace 5. The discharge pipe 701 of the feeding device 7 passes through the wall of the collector 8 and enters the sludge feed port at the end of the adjacent inner rotating cylinder 503. The feeding device 7 is a screw conveyor. The cylinder at the end of the screw conveyor is covered with round holes. Under the action of the screw cutter, the sludge is squeezed into spherical particles through the round holes of the cylinder and then slides into the inner rotating cylinder 503 along the inclined angle of the discharge pipe 701.

[0041] The discharge device 9 is set at the sludge discharge port of the sludge drying furnace 5. The discharge device 9 is a screw conveyor, and its inlet is connected to the discharge device 9 via an arc-shaped funnel 901. The dried sludge can fall into the arc-shaped funnel 901 through the sludge discharge port 510 at the right end of the outer rotating drum 504, and is then crushed by the screw cutter of the discharge device 9 to complete the discharge.

[0042] In this invention, to ensure the airtightness of the first sealing chamber 6, a sealing structure is provided between the first sealing chamber 6 and the outer wall of the sludge drying furnace 5. The sealing structure includes two annular protrusions 516 welded to the outer surface of the outer rotating cylinder of the sludge drying furnace 5, and a sealing ring 11 that mates with the annular protrusions 516. The sealing ring 11 and the annular protrusions 516 form a labyrinth seal. The sealing ring 11 is a metal part with several grooves machined inside to mate with the annular protrusions 516. It is composed of two halves, which are fitted onto the corresponding protrusion positions on the outer rotating cylinder during installation. Its inner circle forms a labyrinth seal with the outer rotating cylinder, and its outer side is positioned by the sealing chamber wall 13. To improve the sealing effect, a flexible asbestos strip 12 is provided at the outer end of the sealing ring 11 to form a contact seal with the outer surface of the outer rotating cylinder of the sludge drying furnace.

[0043] The working process of sludge treatment in this invention is as follows:

[0044] Driven by the drive mechanism 501, the sludge drying furnace 5 rotates. The feeding device 7 shears and pushes the sludge entering the furnace through its spiral cutter and squeezes it into sludge particles. The sludge particles fall into the inner rotating cylinder 503 of the sludge drying furnace 5 through the discharge pipe 701. Under the action of the inner guide spiral blades 507 in the inner rotating cylinder 503, the sludge particles are tumbled and move to the left. When the sludge particles reach the leftmost end of the inner rotating cylinder 503, they fall from the inner rotating cylinder 503 into the outer rotating cylinder 504. Then, under the action of the outer guide spiral blades 506 in the outer rotating cylinder 504, they move in the opposite direction to the right end of the outer rotating cylinder (i.e., the discharge end). Finally, the dried sludge particles fall into the arc-shaped funnel 901 through the sludge discharge port 510 on the end plate I 509 and are crushed by the spiral cutter of the discharge device 9 to complete the discharge.

[0045] During the movement of sludge particles in the sludge drying furnace 5, hot air from the tunnel kiln enters the first sealed chamber 6 through the opening 101 to heat the sludge drying furnace 5 from the outside. The hot air in the first sealed chamber 6 directly contacts the inner rotating cylinder 503 of the sludge drying furnace 5 through the pipe hole of the support frame 508 to heat it. At the same time, after the blower 3 is started, the sludge drying furnace 5 is forced to ventilate. The hot air with residual heat from the bricks at the tail of the tunnel kiln is collected by the heat collector 8 and enters the inner rotating cylinder 503 to fully contact the sludge particles in the rotating cylinder, drying the sludge particles. At the same time, the forced ventilation quickly removes the moisture in the furnace, thereby achieving sludge drying treatment.

[0046] The other parts in this embodiment are all existing technologies and will not be described in detail here.

[0047] Example 2

[0048] As attached Figure 9 As shown, this embodiment is basically the same as embodiment 1, except that the closed structure used in this embodiment to isolate the sludge outlet from the outside air is different from that in embodiment 1. The closed structure used in this embodiment to isolate the sludge outlet from the outside air is as follows: a second sealing chamber 14 is set outside the discharge end of the sludge drying furnace 5. The second sealing chamber 14 can share a partition wall with the first sealing chamber 6, and is isolated from the high-temperature zone by an intermediate partition wall. The second sealing chamber 14 seals the discharge end of the sludge drying furnace 5 inside. At this time, the outer rotating cylinder 504 and the inner rotating cylinder 503 at the discharge end of the sludge drying furnace form an open structure, constituting the sludge discharge outlet. The solar collector 8, the feeding device 7, and the discharge device 9 are all fixed inside the wall of this sealed chamber. During discharge, the dried sludge particles fall directly into the lower arc-shaped funnel 901, and then are discharged through the spiral cutter of the discharge device 9. Because the screw conveyor has a certain sealing performance, this sealed chamber is not connected to the outside air, which can ensure the stability of the drying environment inside the sludge drying furnace 5.

[0049] The other parts of this embodiment are the same as those in Embodiment 1, and will not be described again here.

Claims

1. A device for co-processing municipal sludge in a kiln, characterized in that: The system includes a tunnel kiln, a rotary sludge drying furnace, a heat collector, a feeding device, and a discharging device. An opening is located at the top of the cooling zone at the brick outlet of the tunnel kiln. The sludge drying furnace is mounted on a rotating frame above this opening. A first sealed chamber, communicating with the tunnel kiln, is sealed between the outside of the sludge drying furnace and the opening. The sludge drying furnace includes an outer and an inner rotary cylinder arranged coaxially. The outer and inner rotary cylinders are fixedly connected by several tubular support frames. The outer ends of the support frames penetrate the wall of the outer rotary cylinder, allowing their pipe holes to communicate with the outside. Several guide spiral blades are provided on the inner walls of both the inner and outer rotary cylinders, with the guide spiral blades rotating in opposite directions. The sludge inlet and outlet of the sludge drying furnace are both located at... At one end of the sludge drying furnace, the sludge inlet is located at the end of the inner rotating cylinder, and the sludge outlet is located between the inner and outer rotating cylinders. At the other end of the sludge drying furnace, the outer rotating cylinder is fixedly connected to an end plate II with a waste gas outlet in the middle. There is a gap between the end plate II and the adjacent end of the inner rotating cylinder. The sludge outlet of the sludge drying furnace is equipped with a closed structure that isolates the sludge outlet from the outside air. The heat collector is fixedly installed at the brick outlet end of the tunnel kiln. The tail end of the heat collector corresponds to the inner rotating cylinder at the feed end of the sludge drying furnace. The waste gas outlet of the sludge drying furnace is connected to the waste gas treatment equipment through the air duct and the fan. The feed pipe of the feeding device passes through the heat collector wall and enters the sludge inlet at the end of the inner rotating cylinder. The discharge device is set corresponding to the sludge outlet of the sludge drying furnace. The enclosed structure is an end plate I sealed between the inner and outer rotating cylinders at the discharge end of the sludge drying furnace. The end plate I is provided with a sludge discharge port and a gravity gate that opens or closes the sludge discharge port by gravity. The end plate I is provided with a gravity gate guide groove, and the gravity gate slides in conjunction with the gravity gate guide groove. Four sludge discharge ports are evenly distributed along the circumference of the end plate I, and each sludge discharge port is provided with one gravity gate. The dried sludge particles accumulate at the 6 o'clock position directly below the rotating drum, where the sludge outlet is open. When the drum rotates 90 degrees clockwise to the 9 o'clock position, the gravity gate, under its own weight and the counterweight, moves down along the gravity gate guide groove to close the sludge outlet. When the drum rotates to the 12 o'clock position, the gravity gate remains closed. When the drum rotates to the 3 o'clock position, the gravity gate opens along the gravity gate guide groove under its own weight and the counterweight, until it rotates to the 6 o'clock position directly below, where the gravity gate remains open.

2. The kiln co-processing device for municipal sludge as described in claim 1, characterized in that: The inner wall of the inner rotating drum and the inner wall of the outer rotating drum of the sludge drying furnace are both suspended with several gravity hammers. The arrangement density of the gravity hammers gradually decreases along the path from feed to discharge.

3. The kiln co-processing device for municipal sludge according to claim 1, characterized in that: Both the feeding and discharging devices are screw conveyors.

4. The kiln co-processing device for municipal sludge according to claim 1, characterized in that: A sealing structure is provided between the first sealing chamber and the outer wall of the sludge drying furnace. The sealing structure includes two annular protrusions fixedly installed on the outer surface of the outer rotating drum of the sludge drying furnace and a sealing ring that cooperates with the annular protrusions. The sealing ring and the annular protrusions form a labyrinth seal.

5. The kiln co-processing device for municipal sludge according to claim 4, characterized in that: The outer end of the sealing ring is provided with a flexible asbestos strip that forms a contact seal with the outer surface of the outer rotating drum of the sludge drying furnace.

6. A sludge treatment method for a kiln co-processing municipal sludge device as described in any one of claims 1-5, characterized in that: Sludge particles are fed into the inner drum of the sludge drying furnace through the feeding device. During the rotation of the sludge drying furnace, they are tumbled and moved forward by the guide spiral blades in the inner drum. At the end of the inner drum, they fall into the outer drum, and then move in the opposite direction to the discharge end by the guide spiral blades in the outer drum, and enter the discharge device through the sludge discharge port. During the movement of the sludge particles in the sludge drying furnace, on the one hand, the heat emitted by the high-temperature brick stacks in the tunnel kiln enters the first sealed chamber to heat the sludge drying furnace from the outside. On the other hand, the waste heat of the tunnel kiln is introduced into the sludge drying furnace through forced ventilation to contact the sludge particles and remove moisture, thereby achieving sludge drying.

Images