Pyrolysis and incineration treatment system for self-sustaining circulation carbon-containing solid waste rotary kiln

Abstract

The invention discloses a thermal energy self-sustaining circulation carbon-containing solid waste rotary kiln pyrolysis and incineration treatment system which comprises a feeding port, an ejector, a combustor, a furnace pipe, a smoke pipe, a steam generator, an air preheater and a rotating device. Generated smoke is turned by 180 degrees through a reversal chamber, is subjected to sufficient heat exchange through a furnace body smoke pipe and then is exhausted from the smoke chamber, smoke waste heat heats water to generate steam and heats cold air into hot air to eject pyrolysis gas for combustion, the temperature of the furnace pipe and the outer wall of the smoke pipe is controlled to be about 600 DEG C, and the furnace pipe and the smoke pipe are driven by a motor to rotate to repeatedly stir and heat carbon-containing solid waste, so that the carbon-containing solid waste is rapidly pyrolyzed; carbon-containing solid waste is converted into pyrolysis gas, then the pyrolysis gas is incinerated, gas pollutants generated by pyrolysis of the carbon-containing solid waste are incinerated, self-sustaining circulating ultralow emission of the carbon-containing solid waste heat is achieved, the system integrates pyrolysis and incineration of the carbon-containing solid waste, treatment is efficient, the energy utilization rate is high, cost is low, solid waste residues can be collected and utilized, and the system is economical and environmentally friendly.

Description

Technical Field

[0001] This invention relates to the field of carbon-containing solid waste thermal utilization technology, specifically a self-sustaining circulating rotary kiln pyrolysis and incineration treatment system for carbon-containing solid waste. Background Technology

[0002] Traditional methods for treating carbonaceous solid waste mainly include landfilling and incineration; however, these methods have many drawbacks. While incineration can reduce the volume of carbonaceous solid waste to some extent, it easily produces highly toxic and harmful substances such as dioxins. If not handled properly, these substances can cause extremely serious harm to the environment and human health. Furthermore, some carbonaceous solid wastes, such as certain chemical waste residues, have complex compositions, and incomplete combustion during incineration may produce other pollutants, further exacerbating environmental pressure.

[0003] Against this backdrop, carbonaceous solid waste pyrolysis technology has gradually gained attention as a more promising treatment method. However, different types of carbonaceous solid waste have varying organic compositions, and strictly screening various types of carbonaceous solid waste according to pyrolysis conditions is costly and difficult to implement. Common pyrolysis equipment includes rotary kiln pyrolysis furnaces and fixed-bed pyrolysis furnaces. Rotary kiln pyrolysis furnaces use the slow rotation of the furnace body to ensure uniform heating of carbonaceous solid waste within the furnace, achieving a relatively stable pyrolysis process. However, traditional rotary kiln pyrolysis furnaces lack effective temperature equalization devices, making it difficult to form a stable and balanced reaction temperature field for carbonaceous solid waste. This results in the difficulty of forming a continuous and stable combustible gas during the treatment process, hindering the complete pyrolysis of carbonaceous solid waste and causing problems such as localized overheating, which may lead to pyrolysis side reactions and carbonization due to localized overheating. Fixed-bed pyrolysis furnaces, on the other hand, place carbonaceous solid waste on a fixed bed and promote pyrolysis through bottom or side heating. However, this method also suffers from uneven heating of carbonaceous solid waste on the bed, easily leading to localized overheating or incomplete pyrolysis, affecting pyrolysis efficiency and energy utilization. To address the uneven temperature distribution problem in traditional pyrolysis furnaces, patent CN110093188A, published by Shaanxi Borui New Environmental Protection Technology Co., Ltd., proposes a high-temperature superconducting, pollution-free waste pyrolysis gasification furnace. This technology uses high-temperature superconducting heat transfer, resulting in a uniform temperature field distribution along the axial and radial axes within the furnace. However, it also suffers from drawbacks: the high-temperature zone of the superconducting heat transfer tube cannot directly contact the carbonaceous solid waste, relying solely on external tile fins for heat transfer. This causes some carbonaceous solid waste within the furnace to fail to reach the required pyrolysis temperature. Furthermore, the stirring of the carbonaceous solid waste via a spiral plate results in high resistance, leading to significant wear on the central rotating shaft and its transmission bearings. Therefore, a new carbonaceous solid waste pyrolysis device is needed to solve the problems of uneven temperature field, incomplete pyrolysis, and localized excessively high temperatures found in existing carbonaceous solid waste pyrolysis devices. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a self-sustaining circulating rotary kiln pyrolysis and incineration system for carbonaceous solid waste. By coupling the pyrolysis furnace with the rotary kiln system, the furnace shell remains fixed while the flue pipes and furnace chamber rotate around the center line of the furnace chamber, or the furnace shell rotates around the center line of the furnace chamber while the flue pipes and furnace chamber remain fixed. This achieves the goal of uniform temperature within the pyrolysis furnace, sufficient pyrolysis, comprehensive utilization of energy for carbonaceous solid waste treatment, and safety, efficiency, and environmental pollution-free operation. This solves the problems of uneven temperature field, insufficient pyrolysis, and excessively high local temperatures found in existing carbonaceous solid waste pyrolysis devices.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: a self-sustaining circulating rotary kiln pyrolysis and incineration treatment system for carbonaceous solid waste, comprising a furnace body, the furnace body being connected to a feed inlet, a furnace chamber being coaxially arranged inside the furnace body, a flue pipe being arranged between the furnace chamber and the furnace body, and the furnace chamber being connected to the flue pipe; the furnace body is connected to a filter and an ejector in sequence through a pyrolysis gas outlet; the flue pipe outlet is connected to a steam generator and an air preheater in sequence, the hot air outlet of the air preheater is connected to the ejector, a liquefied petroleum gas tank is connected to a burner head through the ejector, the burner head is located at the front end of the furnace body, and the burner head is connected to the furnace chamber; a front tube sheet and a rear tube sheet are arranged at both ends of the furnace body, and the two ends of the furnace chamber are respectively connected to the front tube sheet and the rear tube sheet; The two ends of the flue are connected to the front tube plate and the rear tube plate respectively, and a rotating device is installed on the outside of the front tube plate or the outside of the furnace body. Alternatively, one end of the flue is connected to the front tube sheet, and the other end is connected to the furnace liner. Rotating devices are installed on the outer sides of both ends of the front tube sheet and the furnace liner.

[0006] Furthermore, the rotating device on the outer side of the front tube sheet and the outer side of the furnace body includes a drive motor, a drive gear, and a gear ring connected along the transmission chain. The gear ring is arranged in a circle on the outer side of the front tube sheet, the rear tube sheet, and the furnace body.

[0007] Furthermore, a toothed ring is set in the middle of the furnace body on the outer side, and at least two support rings are also set on the outer side of the furnace body. A support roller is set below the support ring. The support ring is located between the toothed ring and the end of the furnace body. When a rotating device is set on the outer side of the furnace body, the feed inlet is set at the rear end of the furnace body.

[0008] Furthermore, a combustion chamber is provided on the outer side of the rear tube sheet, and the flue pipe is connected to the furnace chamber through the combustion chamber.

[0009] Furthermore, the outer wall of the furnace is equipped with grab nails, and the flue includes a plain tube and a spiral finned flue. The plain tube is close to the furnace, and the spiral finned flue is close to the inner wall of the furnace. The two ends of the plain tube and the spiral finned flue are connected to the furnace body through the front tube plate and the rear tube plate, respectively.

[0010] Furthermore, the furnace liner is connected to the front tube sheet and the rear tube sheet via high-temperature bearings.

[0011] Furthermore, the rotating devices on both sides of the furnace liner include a drive motor, a drive gear, a driven gear, and a gear ring connected along the rotation chain; the rotating devices on the outside of the front tube sheet include a drive motor, a drive gear, and a gear ring connected along the rotation chain; an explosion-proof door is provided at the rear end of the furnace liner, and a sealing plate is provided at the rear end of the furnace body, with the sealing plate connected to the rear end of the furnace liner via a high-temperature bearing.

[0012] Furthermore, the filter is a dual-channel flue gas filter, with valves installed in each channel of the flue gas boiler.

[0013] Furthermore, the furnace body consists of, from the inside out, a refractory layer, a heat insulation layer, a metal layer, and a thermal insulation layer; the furnace liner is made of heat-resistant steel with a heat resistance of not less than ℃, and the outer wall of the furnace liner is coated with an anti-corrosion coating.

[0014] Furthermore, an airlock is installed between the feed inlet and the furnace body; a slag discharge port is opened on the furnace body, and a slag trough is set below the furnace body, with the bottom of the slag trough connected to the slag pit through a slag discharge pipe; a support platform is set at the bottom of the furnace body and the bottom of the rotating device, and the support platform adopts a liftable structure.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: To address the issues of uneven temperature distribution and incomplete pyrolysis, traditional pyrolysis furnaces lack temperature equalization devices, leading to an unstable temperature field in the reaction of carbonaceous solid waste. This makes it difficult to form a continuous and stable combustible gas, resulting in incomplete pyrolysis of carbonaceous solid waste and susceptibility to side reactions and carbonization caused by localized overheating. This invention utilizes a furnace rotation device to ensure uniform heating of the carbonaceous solid waste. Combined with a rational layout of the flue pipes, high-temperature heat is evenly transferred to the carbonaceous solid waste, effectively solving the problem of uneven temperature distribution. This ensures rapid and complete pyrolysis of carbonaceous solid waste in a high-temperature, oxygen-deficient environment, improving pyrolysis efficiency and energy utilization.

[0016] To address the issues of pyrolysis gas utilization and pollution, existing pyrolysis furnaces suffer from low pyrolysis gas collection efficiency and contain impurities that affect combustion efficiency. Incomplete combustion also generates secondary pollution. This invention organically combines the pyrolysis and incineration processes of carbonaceous solid waste. The combustible gas generated by pyrolysis is directly incinerated within the system, achieving self-sustaining recycling of thermal energy without the need for additional external energy input. This reduces processing costs and improves energy utilization.

[0017] This invention addresses the problem of ineffective utilization of flue gas waste heat. Traditional pyrolysis furnaces underutilize flue gas waste heat, leading to energy waste. By connecting a steam generator and an air preheater to the flue gas outlet, the invention successfully recovers and utilizes flue gas waste heat, converting it into steam and preheated air for use in other processes or to support the combustion of pyrolysis gas. This reduces energy consumption and improves the overall energy efficiency of the system.

[0018] This invention addresses the high cost of screening carbonaceous solid waste before it enters the furnace. Different carbonaceous solid wastes require different pyrolysis conditions, but screening is costly and difficult to implement. The invention utilizes a liftable support platform to adjust the furnace tilt angle, aiding in the uniform distribution of carbonaceous solid waste, and a furnace rotation device to ensure even heating. These features allow the system to adapt to different characteristics of carbonaceous solid waste to a certain extent, eliminating the need for strict screening and reducing processing costs.

[0019] The system of this invention not only exhibits superior performance in the mode where the furnace body is fixed and the flue pipes and furnace shell rotate, but also possesses multiple other operating modes, such as a rotating furnace body with the flue pipe plate, furnace shell, rear tube plate, and combustion chamber fixed. This diversified operating mode design allows the system to flexibly switch according to different treatment requirements, the characteristics of carbonaceous solid waste, and actual working conditions, greatly expanding the system's application scope and improving its applicability and flexibility under various complex conditions, providing a more comprehensive and efficient solution for carbonaceous solid waste treatment. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a self-sustaining, recyclable rotary kiln pyrolysis and incineration treatment system for carbonaceous solid waste according to the present invention. Figure 2a These are schematic diagrams illustrating the structures of different types of smoke pipes according to the present invention; Figure 2b This is a schematic diagram of the system structure of the present invention without a combustion chamber; Figure 2c This is a schematic diagram of the system structure of the rotating furnace body of the present invention; Figure 3a This is a cross-sectional view of the furnace body of a self-sustaining circulating rotary kiln pyrolysis and incineration treatment system for carbonaceous solid waste according to the present invention. Figure 3b Cross-sectional views of furnace bodies with different flue types; Figure 3c This is a cross-sectional view of a furnace body without a combustion chamber. Figure 3d A sectional view of the furnace body with a rotating arrangement structure; Figure 4a This is a diagram showing the layout of the flue gas pipes in a self-sustaining, circulating rotary kiln pyrolysis and incineration system for carbonaceous solid waste, and a combustion chamber-free structure, according to the present invention. Figure 4b Schematic diagrams of the smoke box tube sheet, the combustion chamber tube sheet, and the smoke box tube sheet without a combustion chamber structure are shown for this system. Figure 5a This is a diagram showing the layout of different types of smoke pipes according to the present invention; Figure 5b Schematic diagrams of the rear tube sheet and smoke box tube sheet for different types of smoke pipes; Figure 6a This is a diagram showing the flue pipe arrangement and the flue box tube plate of the rotating furnace body of the present invention. Figure 6b Schematic diagram of the combustion chamber tube sheet Figure 7a This is a schematic diagram of the corrugated tube of the present invention; Figure 7b This is a schematic diagram of the spiral finned smoke tube of the present invention; Figure 8 This is a side view of the slag discharge pipe of the present invention; Figure 9 This is a schematic diagram of the furnace body flange connection of the present invention; Figure 10 This is a schematic diagram of the bearing connection of the present invention; Figure 11 This is a schematic diagram of the flue gas filter of the present invention; The labels in the diagram are as follows: 1-Feed inlet, 2-Air lock, 3-High temperature bearing, 4-Gear ring, 5-Rear tube sheet, 6-Combustion chamber, 7-Roller, 8-Support platform, 9-Furnace body, 091-Furnace wall refractory layer, 092-Furnace wall insulation layer, 093-Furnace wall metal layer, 094-Furnace body insulation layer, 10-Slag pit, 101-Slag discharge pipe, 11-Slag trough, 12-Drive gear, 13-Drive motor, 14-Liquefied petroleum gas tank, 15-Blower, 16- 17-Air preheater, 18-Steam generator, 19-Filter, 10-First filter, 11-Second filter, 12-Inlet three-way valve, 13-Outlet three-way valve, 14-Ejector, 25-Driven gear, 26-Burn head, 27-Smoke box, 28-Front tube sheet, 29-Pyrolysis gas outlet, 20-Pyrolysis chamber, 21-Carbon-containing solid waste, 22-Smooth tube, 23-Helical finned smoke tube, 24-Holding nail, 35-Furnace shell, 36-Explosion-proof door. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] This invention provides a self-sustaining circulating rotary kiln pyrolysis and incineration system for carbonaceous solid waste, comprising a furnace body 9, a feed inlet 1, a furnace chamber 30 coaxially arranged inside the furnace body 9, a flue pipe between the furnace chamber 30 and the furnace body 9, and the furnace chamber 30 connected to the flue pipe; the furnace body 9 passes through a pyrolysis gas outlet 24 and sequentially connects to a filter 18 and an ejector 19; the flue pipe outlet sequentially connects to a steam generator 17 and an air preheater, the hot air outlet of the air preheater is connected to the ejector 19, and a liquefied petroleum gas tank 14 is connected to a burner head 21 via the ejector 19, the burner head 21 is located at the front end of the furnace body 9 and is connected to the furnace chamber 30; a front tube sheet 23 and a rear tube sheet 5 are arranged at both ends of the furnace body 9, and the two ends of the furnace chamber 30 are respectively connected to the front tube sheet 23 and the rear tube sheet 5; The two ends of the flue are connected to the front tube plate 23 and the rear tube plate 5 respectively. A rotating device is set on the outside of the front tube plate 23 or the outside of the furnace body 9. Alternatively, one end of the flue pipe is connected to the front tube plate 23, and the other end is connected to the furnace 30. Rotating devices are installed on the outer sides of both ends of the front tube plate 23 and the furnace 30. The design of the support platform 8 allows adjustment of the furnace body's tilt angle, ensuring that the carbonaceous solid waste 26 enters the furnace system evenly. The furnace 30 and flue pipe rotate under the drive of the rotating device, using rotational motion to continuously tumble and stir the carbonaceous solid waste 26 within the pyrolysis chamber 25, ensuring uniform heating and complete pyrolysis of the waste, while preventing localized overheating or carbonization. The incineration system introduces pyrolysis gas into the furnace 30 for combustion through the filter 18 and ejector 19. The high-temperature flue gas generated by combustion undergoes sufficient heat exchange through the flue pipe before entering the steam generator 17 and air preheater 16, completing waste heat recovery. This process both generates steam to provide heat energy and further increases the air preheating temperature, enhancing the system's energy utilization efficiency.

[0023] This system supports multiple operating modes, allowing for adjustments to the furnace body and rotating component configurations based on actual needs. For example, when the furnace body 9 is fixed, the rotating components include the front tube plate 23, flue pipes, furnace chamber 30, and rear tube plate 5. The flue pipe layout is flexible, allowing for the use of either thin or thick pipe designs, or even eliminating the need for a combustion chamber and directly drawing flue gas from the furnace chamber 30. When the furnace body rotates, the use of the grab pins 29, the adjustment of the tilt angle, and the outer spiral finned flue pipes 28 ensures that the carbonaceous solid waste 26 is evenly tumbled and fully pyrolyzed within the furnace, propelling it deeper into the pyrolysis chamber 25. Combined with the dynamic and static sealing design of the flue gas system, this ensures stable system operation. These diverse operating modes can flexibly adapt to different carbonaceous solid waste treatment needs, improving treatment efficiency and ensuring system reliability.

[0024] In the description of this invention, it should be understood that the terms "center", "lateral", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", "side", "end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0025] Implementation Case 1: Furnace Body Fixing Figure 1 and Figure 2aThe specific implementation method is shown with the front tube sheet 23, bare tube 27, spiral finned smoke tube 28, furnace liner 30, and rear tube sheet 5 rotating while the furnace body 9 is fixed. Carbon-containing solid waste 26 enters the pyrolysis chamber 25 through the top feed inlet 1 and the airlock 2. The support platform 8 tilts the furnace body to a 15° angle to accelerate the filling of the material in the pyrolysis chamber 25. After filling, the support platform 8 is adjusted to be horizontal. When the system is started, the liquefied petroleum gas tank 14 is opened. The cold air delivered by the blower 15 is preheated to 250°C by the air preheater 16 and then enters the ejector 19. After mixing with the liquefied gas, it is ignited in the furnace liner 30. The flame temperature rises to 900°C. The high-temperature flue gas washes over the inner wall of the furnace liner and enters the bare tube 27 and spiral finned smoke tube 28 through the combustion chamber 6 to heat the carbon-containing solid waste 26 in the pyrolysis chamber 25. Simultaneously, the drive motor 13 is activated to drive the driven gear 20. The driven gear 20 drives the front tube plate 23 to rotate at 2 rpm and the furnace liner 30 to rotate at 1.5 rpm via the gear ring 4. During rotation, the spiral finned smoke tube 28 and the grabbing nails 29 cut and tear solid waste clumps. The furnace liner 30 is connected to the front tube plate 23 and the rear tube plate 5 via high-temperature bearings 3. Figure 10 As shown. When the temperature in the pyrolysis chamber reaches 600℃, solid waste pyrolysis gas is stably produced, which takes about 45 minutes. After closing the liquefied petroleum gas valve, the pyrolysis gas enters filter 18. Filter 18 is a dual-channel flue gas filter, including a first filter 181 and a second filter 182. An inlet three-way valve 183 is installed at the inlet of filter 18, and an outlet three-way valve 184 is installed at the outlet. When the flue gas flow rate is high, both the first filter 181 and the second filter 182 can be opened simultaneously. When the flue gas flow rate is low or one side of the flue gas filter needs maintenance, the other side of the flue gas filter is opened. Figure 11 As shown. The purified pyrolysis gas is drawn into the furnace chamber 30 via the ejector 19 to achieve self-sustaining combustion. At this time, the motor output power is increased, and the front tube plate 23 rotates at 10 rpm while the furnace chamber 30 rotates at 7.5 rpm, further promoting uniform heating of the solid waste inside the furnace. The incineration flue gas enters the combustion chamber 6 from the furnace chamber 30 via the rear tube plate 5 and then turns 90°. It continuously heats the solid waste as it enters the inner bare tube 27 and the outer spiral finned flue tube 28. The flue gas temperature drops from 900℃ to 400℃ and then flows into the smoke box 22. It then passes through the steam generator 17 to generate 0.8MPa saturated steam and the air preheater 16 to recover waste heat to 150℃ before being discharged. The flue tubes inside the furnace are fixed on the front tube plate 23 and the rear tube plate 5, with toothed rings 4 welded to the outside. Figure 4b This diagram shows schematics of the smoke box tube sheet, the combustion chamber tube sheet, and a smoke box tube sheet without a combustion chamber. Figure 5b This diagram illustrates the front and rear tube sheet structures of a coarse-fiber flue type. The center is the furnace chamber 30, surrounded by a ring of eight spiral-finned flue tubes 28. An outer ring of gears meshes with gears at the bottom of the furnace, driving the internal flue tubes to rotate. The internal flue tubes are not limited to spiral-finned flue tubes and plain tubes; they can also be internally spiral-finned flue tubes and corrugated tubes, such as… Figure 7a and Figure 7bAs shown; Figure 4a The diagram shows the furnace flue arrangement with an outer ring of spiral finned flue tubes 28 and an inner ring of plain flue tubes 27. Figure 5a This is a schematic diagram of the flue pipe arrangement. The central part is the pyrolysis furnace chamber 30, and a ring of eight spiral-finned flue pipes 28 is arranged around the outer side of the chamber 30. The furnace body 9, from the inside out, consists of a furnace wall refractory layer 091, a furnace wall insulation layer 092, a furnace wall metal layer 093, and a furnace body heat insulation layer 094. Figure 3a , Figure 3b , Figure 3c and Figure 3d As shown; the furnace liner 30 is lined with a refractory material layer, such as refractory castable, ceramic fiber, or refractory brick. The material of the furnace liner 30 can be 12Cr1MoV, 12Cr2MoWVTiB, 12Cr3MoVSiTiB, or higher alloy steel to ensure that the outer wall of the furnace liner 30 can withstand a temperature of about 600℃ to meet the temperature requirements of the pyrolysis of carbon-containing solid waste 26. Secondly, the outer wall of the furnace liner 30, that is, the surface in direct contact between the furnace liner 30 and the pyrolysis products of the carbon-containing solid waste 26, should be provided with an anti-corrosion coating to enhance the furnace liner's resistance to high-temperature corrosion caused by sulfur, chlorine, and their coupling products, such as molten salt. Alternatively, a nickel-based alloy, such as the Inconel 600 series, can be welded onto the outer wall material of the furnace liner as the base material to form an anti-corrosion coating. After the carbon-containing solid waste in the furnace is completely pyrolyzed, the slag discharge trough door is opened, and the residue slides down into the slag discharge trough 11 by the rotation of the flue pipe, falling into the slag pit 10 at a red-hot state of 600℃ for water quenching. Figure 8 As shown; stop feeding two hours before shutdown, extinguish the fire after all residue has been discharged, and continue differential rotation for thirty minutes to cool the furnace body. During furnace shutdown and maintenance, remove the front tube sheet 23 and rear tube sheet 5, open the upper and lower flanges of the furnace body 9 for internal cleaning and maintenance, as follows: Figure 9 As shown.

[0026] Optionally, in all embodiments of the present invention, the air preheater 16 is a steel tube type air preheater.

[0027] Implementation Case 2: Fixed furnace body, no combustion chamber provided Figure 2bThis demonstrates a specific implementation method with rotating front tube sheet 23, flue pipe, and furnace shell 30, fixed furnace body 9, no combustion chamber, and an added explosion-proof door 31. Solid waste is fed in through the top feed inlet 1, and the gas is sealed by the airlock 2; the end of the furnace shell 30 is directly connected to the explosion-proof door 31, with an explosion pressure of 0.5 MPa. Initially, combustion relies on liquefied petroleum gas (LPG). 900°C flue gas is directly drawn from the furnace shell 30 into the flue pipe. The spiral finned flue pipe 28 rotates at 2 rpm, and the furnace shell 30 operates at a differential speed of 1.5 rpm. The grab pins 29 forcibly agitate the material. After the pyrolysis chamber temperature reaches 600°C, the LPG valve is closed, allowing the pyrolysis gas to sustain combustion. The 900°C high-temperature flue gas directly impacts the flue pipe. The flue gas enters the steam generator 17 via the smoke box 22 to produce saturated steam. The air preheater 16 heats the combustion air to 250°C before exhausting at 150°C. After the carbon-containing solid waste in the furnace is completely pyrolyzed, the slag discharge trough door is opened. The residue slides down into the slag discharge trough 11 as the flue rotates. The 600℃ residue falls into the slag pit 10 through the slag discharge trough 11. The furnace is shut down two hours before shutdown. After the residue is discharged, the furnace is extinguished and rotated for 30 minutes to cool. The explosion-proof door 31 monitors the pressure fluctuation in real time.

[0028] Implementation Case 3: Furnace Rotation Figure 2cThe specific implementation is shown with the furnace body 9 rotating and the front tube plate 23, flue pipes 27-28, furnace liner 30, and rear tube plate 5 fixed. The feed inlet 1 passes through the combustion chamber 6 and the rear tube plate 5. The screw feeder sends solid waste into the pyrolysis chamber 25. The support platform 8 tilts the furnace body to a 15° angle to accelerate the filling of the material in the pyrolysis chamber 25. After filling is completed, the support platform 8 is adjusted to be horizontal. When the system starts, the liquefied petroleum gas tank 14 is opened. The cold air delivered by the blower 15 is preheated to 250°C by the air preheater 16 and then enters the ejector 19. After mixing with the liquefied gas, it is ignited in the furnace liner 30. The flame temperature rises to 900°C. The high-temperature flue gas washes the inner wall of the furnace liner and enters the flue pipe through the combustion chamber 6 to heat the carbon-containing solid waste 26 in the pyrolysis chamber 25. Simultaneously, the drive motor 13 is started, driving the drive gear 12 to directly rotate the furnace body 9 at 0.5-2 rpm. The grab pins 29 on the inner wall of the furnace body 9 repeatedly throw the material to ensure that the solid waste in the furnace is heated evenly. When the temperature of the pyrolysis chamber reaches 600℃, the solid waste pyrolysis gas is stably produced, which takes about 45 minutes. The liquefied gas valve is closed, and the purified pyrolysis gas is drawn into the furnace chamber by the ejector 19 to achieve self-sustaining combustion. At this time, the output power of the motor is increased to make the furnace body rotate at a speed of 5 rpm, further promoting the even heating of the solid waste in the furnace. The incineration flue gas enters the combustion chamber 6 from the furnace chamber 30 through the rear tube plate 5 and turns 90°. When it enters the inner light tube 27 and the outer spiral finned flue tube 28, it continuously heats the solid waste. The flue gas temperature drops from 900℃ to 400℃ and flows into the smoke box 22. It then passes through the steam generator 17 to generate 0.8MPa saturated steam and the air preheater 16 to recover waste heat to 150℃ before being discharged into the air. After the carbonaceous solid waste in the furnace is completely pyrolyzed, the support platform 8 is tilted to 25° when the residue is discharged. The slag discharge chute door is opened, and the residue falls into the slag pit 10 at a red-hot state of 600°C through the slag discharge pipe 101 for water quenching. Feeding is stopped 2 hours before the furnace is shut down. After the residue is discharged, the furnace is extinguished and the furnace body continues to rotate at a differential speed for 30 minutes to cool it. The large-capacity furnace body is driven by four 7.5kW motors 13 driving the gear ring 4. The support platform 8 is tilted at 10° to optimize the material flow. A gear ring 4 is set in the middle of the furnace body on the outer side of the furnace body 9. At least two support rings are also set on the outer side of the furnace body 9. The support rings are located between the gear ring and the end of the furnace body 9. When the rotating device is set on the outer side of the furnace body 9, the feed port is set at the rear end of the furnace body 9. Figure 6a The diagram shows the layout of the flue pipes. The center is the furnace chamber 30, and two rings of flue pipes are arranged around the furnace chamber 30. The inner ring consists of eight plain tubes 27 without spiral fins, and the outer ring consists of seven flue pipes 28 with spiral fins. Figure 6b This is a schematic diagram of the front smoke box tube plate of the thin smoke tube type structure. The middle is the furnace liner 30. Two rings of smoke tubes are arranged on the outside of the furnace liner 30. The inner ring consists of eight plain tubes 27 without spiral fins, and the outer ring consists of seven spiral finned smoke tubes 28. In addition, a slag discharge trough is opened at the bottom of the tube plate. The residue obtained from pyrolysis of carbon-containing solid waste, etc., is discharged into the slag discharge trough by gravity through the lifting of the bottom of the furnace body, and then discharged from the pyrolysis furnace. The support platform 8 described in this invention adopts an independently distributed structural design. Each support platform 8, located below the rotating device and furnace body 9, is a liftable structure, allowing for independent control to tilt the furnace body at different angles. Furthermore, the rotating structure can adjust accordingly. The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A self-sustaining, recyclable rotary kiln pyrolysis and incineration system for carbonaceous solid waste, characterized in that, The furnace includes a furnace body (9), which is connected to a feed inlet (1). A furnace chamber (30) is coaxially arranged inside the furnace body (9). A flue is arranged between the furnace chamber (30) and the furnace body (9), and the furnace chamber (30) is connected to the flue. The furnace body (9) is connected to a filter (18) and an ejector (19) in sequence through a pyrolysis gas outlet (24). The outlet of the flue is connected to a steam generator (17) and an air preheater in sequence. The hot air outlet of the air preheater is connected to the ejector (19). A liquefied petroleum gas tank (14) is connected to a burner head (21) through the ejector (19). The burner head (21) is located at the front end of the furnace body (9) and is connected to the furnace chamber (30). A front tube sheet (23) and a rear tube sheet (5) are arranged at both ends of the furnace body (9). The two ends of the furnace chamber (30) are connected to the front tube sheet (23) and the rear tube sheet (5) respectively. The two ends of the flue are connected to the front tube plate (23) and the rear tube plate (5) respectively. A rotating device is set on the outside of the front tube plate (23) or the outside of the furnace body (9). Alternatively, one end of the flue is connected to the front tube plate (23), and the other end is connected to the furnace liner (30). Rotating devices are installed on the outer sides of both ends of the front tube plate (23) and the furnace liner (30).

2. The self-sustaining, recyclable rotary kiln pyrolysis and incineration system for carbonaceous solid waste according to claim 1, characterized in that, The rotating device on the outside of the front tube sheet (23) and the outside of the furnace body (9) includes a drive motor (13), a drive gear (12) and a gear ring (4) connected along the transmission chain. The gear ring (4) is arranged in a circle on the outside of the front tube sheet (23), the rear tube sheet (5) and the furnace body (9).

3. The self-sustaining, recyclable rotary kiln pyrolysis and incineration system for carbonaceous solid waste according to claim 2, characterized in that, A toothed ring (4) is set in the middle of the furnace body (9) on the outside of the furnace body (9). At least two support rings are also set on the outside of the furnace body (9). A support roller (7) is set below the support ring. The support ring is located between the toothed ring and the end of the furnace body (9). When a rotating device is set on the outside of the furnace body (9), the feed port is set at the rear end of the furnace body (9).

4. The self-sustaining, recyclable rotary kiln pyrolysis and incineration system for carbonaceous solid waste according to claim 1, characterized in that, A combustion chamber (6) is provided on the outside of the rear tube sheet (5), and the flue pipe is connected to the furnace shell (30) through the combustion chamber (6).

5. The self-sustaining, recyclable rotary kiln pyrolysis and incineration system for carbonaceous solid waste according to claim 1, characterized in that, The outer wall of the furnace shell (30) is provided with a grab nail. The smoke pipe includes a plain tube (27) and a spiral finned smoke pipe (28). The plain tube (27) is close to the furnace shell (30), and the spiral finned smoke pipe (28) is close to the inner wall of the furnace body (9). The two ends of the plain tube (27) and the spiral finned smoke pipe (28) are connected to the furnace body (30) through the front tube plate (23) and the rear tube plate (5) respectively.

6. The self-sustaining, recyclable rotary kiln pyrolysis and incineration system for carbonaceous solid waste according to claim 1, characterized in that, The furnace liner (30) is connected to the front tube sheet (23) and the rear tube sheet (5) via a high-temperature bearing (3).

7. The self-sustaining, recyclable rotary kiln pyrolysis and incineration system for carbonaceous solid waste according to claim 1, characterized in that, The rotating device on both sides of the furnace shell (30) includes a drive motor (13), a drive gear (12), a driven gear (20), and a gear ring (4) connected along the rotating chain; the rotating device on the outside of the front tube plate (23) includes a drive motor (13), a drive gear (12), and a gear ring (4) connected along the rotating chain; an explosion-proof door (31) is provided at the rear end of the furnace shell (30), and a sealing plate is provided at the rear end of the furnace body (9). The sealing plate is connected to the rear end of the furnace shell (30) through a high-temperature bearing (3).

8. The self-sustaining, recyclable rotary kiln pyrolysis and incineration system for carbonaceous solid waste according to claim 1, characterized in that, The filter (18) is a dual-channel flue gas filter, and each channel flue gas boiler is equipped with a valve.

9. The self-sustaining, recyclable rotary kiln pyrolysis and incineration system for carbonaceous solid waste according to claim 1, characterized in that, The furnace body (9) consists of a furnace wall refractory layer (091), a furnace wall heat insulation layer (092), a furnace wall metal layer (093), and a furnace body heat insulation layer (094) from the inside to the outside. The furnace liner (30) is made of heat-resistant steel with a heat resistance of not less than (600)℃, and the outer wall of the furnace liner (30) is provided with an anti-corrosion coating.

10. The self-sustaining, recyclable rotary kiln pyrolysis and incineration system for carbonaceous solid waste according to claim 1, characterized in that, An airlock (2) is installed between the feed inlet (1) and the furnace body (9); a slag discharge port is opened on the furnace body (9), and a slag trough (11) is set below the furnace body (9). The bottom of the slag trough (11) is connected to the slag pit (10) through a slag discharge pipe (101); a support platform (8) is set at the bottom of the furnace body (9) and the bottom of the rotating device. The support platform (8) adopts a liftable structure.

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