Solid waste pyrolysis gasification incineration boiler

Abstract

The invention discloses a solid waste pyrolysis and gasification incineration boiler. A new way is provided for harmless incineration treatment and resource reutilization of household garbage and other solid wastes in county-level cities and towns. Comprising a rotatable pyrolyzing furnace body (1), a furnace top cover (25), a secondary combustion chamber (6), a waste heat boiler membrane wall barrel (8), a horizontal flue (14) and a tail steel flue. A secondary combustion chamber smoke outlet (7) of the secondary combustion chamber (6) is connected with a waste heat boiler membrane type wall barrel (8), a first partition membrane type wall (9) and the left side wall of the waste heat boiler membrane type wall barrel (8) form a first downward heat exchange flue (11), and the first partition membrane type wall and a second partition membrane type wall (10) form a second upward heat exchange flue (12). The second partition membrane type wall and the right side wall of the waste heat boiler membrane type wall barrel (8) form a third downward heat exchange flue (13), and the right end of the horizontal flue (14) is connected with a tail steel flue.

Description

Technical Field

[0001] This invention relates to the fields of environmental protection and new energy, and in particular to a solid waste pyrolysis gasification incineration boiler, which is a pyrolysis gasification incineration boiler for the harmless treatment and resource utilization of municipal solid waste and other solid waste. Background Technology

[0002] With the accelerating pace of urbanization, urban domestic waste and other solid waste are increasing daily, becoming a serious problem that pollutes the environment and affects people's lives and economic development. How to economically and effectively dispose of this waste has become one of the most important issues in urban ecological civilization construction. Currently, the main methods for treating urban domestic waste are sanitary landfill, incineration, and composting. Compared with other methods, waste incineration can better achieve the goals of harmlessness, volume reduction, and resource recovery in waste treatment. In China, prefecture-level cities mainly use incineration, while county-level towns mainly use landfill. A major reason why incineration is not widely used in county-level towns is the lack of suitable landfill sites for small and medium-sized waste disposal. Incineration boilers; municipal solid waste is a potential renewable energy source. If it is gasified, it has the potential to reduce background pollutant concentrations and even produce clean gases for power generation. If it is pyrolyzed, resources such as oil, combustible gases, and biochar can be obtained, which is a resource-based treatment model. However, the pyrolysis and gasification of municipal solid waste requires overcoming the challenge of "achieving organized pyrolysis of municipal solid waste." The primary challenge in overcoming this challenge is how to "homogenize" the uneven incineration waste when applying pyrolysis technology to the field of municipal solid waste treatment. This is because homogenization of waste in the furnace is an important means to ensure incineration quality and control emissions. In addition, precise air supply and control of the waste bed are another difficulty in the pyrolysis and gasification process of municipal solid waste.

[0003] A utility model patent with patent number 2005200243495, entitled "A Solid Waste Pyrolysis Gasification Incinerator," discloses the structure of a pyrolysis gasification incinerator. The grate system employs a rotating grate, with annular grid plates fixed to a support in a stepped configuration. Appropriate gaps are formed between adjacent grid plates. A bevel gear is mounted on a sleeve on the support. A small gear on a reducer on the furnace base meshes with the bevel gear to rotate the grate mechanism, thereby achieving… The patent for solid waste pyrolysis gasification incinerator (patent number 2021222483387) discloses a tower-shaped grate structure. Figure 7 is a schematic diagram of the grate structure, but the text only discloses five technical features: grate baffle 151, grate support 152, grate shaft 153, cross steel beam support 154, and first reduction motor 155. It does not address how the grate achieves uniform and precise air delivery or how it smoothly breaks down slag and discharges waste. The ash removal function was not disclosed. Existing technologies generally agree that designing the grate as an integral conical tower structure allows it to penetrate deeper into the combustion layer of the waste incinerator, providing sufficient contact surface between the grate and the waste. This ensures adequate contact between the primary air and the waste, guaranteeing uniform and complete combustion and reducing the loss on ignition. However, ensuring the smooth sliding of ash from the burned waste to the ash removal port, preventing both ash accumulation and air outlet blockage, is a problem that needs to be addressed on-site. Furthermore, existing conical tower grates are all mounted on a central rotating support shaft. The ash removal rotation drive mechanism consists of a ring rack on the grate's annular base. The rotation of the grate around the central rotating support shaft is achieved through the meshing of gears on the output shaft of a single drive motor on one side of the ring rack, thus completing the ash removal function. However, this structure is prone to jamming during grate rotation due to uneven weight distribution above the grate, affecting the smoothness of ash removal.

[0004] The main mode of pyrolysis gasification is "thermal" gasification, i.e., the gasification-incineration route. This requires unifying the flue gas purification system and the incineration system, employing a coupled combustion of pyrolysis and carbon gasification, rather than direct incineration. This is to further reduce the loss on ignition (LOI) of waste incineration and minimize emissions to meet standards. Therefore, existing pyrolysis gasification incinerators are equipped with a secondary combustion chamber to re-burn unburned gases carried in the flue gas from the primary combustion. The secondary combustion chamber in utility model patent No. 2005200243495, entitled "A Pyrolysis Gasification Incinerator for Solid Waste," is a prime example. It is a vertical cylindrical structure located next to the pyrolysis gasification furnace. An auxiliary oil-gas burner is installed at the top of the secondary combustion chamber, which automatically ignites to supplement heat and burns off any unburned gases in the flue gas. The burned flue gas can then enter a subsequent waste heat boiler for heat recovery. However, a connecting flue is required between the secondary combustion chamber and the pyrolysis furnace. Ash from the pyrolysis gas tends to accumulate in the connecting flue, increasing maintenance costs. Furthermore, the existing secondary combustion chamber is prone to roof collapse due to temperature conditions. In addition, how to smoothly discharge the ash from the secondary combustion chamber is also a problem that needs to be solved on-site.

[0005] Waste undergoes pyrolysis and combustion in a pyrolysis gasification incinerator, followed by further purification and combustion in a secondary combustion chamber, producing high-temperature flue gas. Fully utilizing this high-temperature flue gas resource is a key issue in the resource recycling of municipal solid waste and other solid waste after harmless treatment. Designing a solid waste pyrolysis gasification incinerator suitable for the harmless treatment and resource recycling of municipal solid waste and other solid waste, using the high-temperature flue gas to produce high-quality, high-parameter steam for power generation or heating, and further improving the resource recycling level after waste incineration, is a problem that existing technologies need to overcome. However, due to the large amount of dust in the flue gas produced after waste incineration, overcoming the accumulation of large amounts of dust on the boiler's heating surfaces is another problem that existing technologies need to solve. Furthermore, addressing the issue of economizers installed in the flue being easily corroded by dust is another problem that needs to be solved on-site. Summary of the Invention

[0006] This invention provides a solid waste pyrolysis gasification incineration boiler, offering a new approach for the harmless incineration and resource reuse of municipal solid waste and other solid waste in county-level towns.

[0007] The present invention solves the above technical problems through the following technical solutions: A solid waste pyrolysis gasification incineration boiler includes a rotatable pyrolysis furnace body, a furnace top cover, a secondary combustion chamber, a waste heat boiler membrane wall shell, a horizontal flue, a first upward tail steel flue, and a second downward tail steel flue. The furnace top cover is fixedly installed above the top port of the rotatable pyrolysis furnace body. A waste inlet and a pyrolysis furnace flue outlet are respectively provided on the furnace top cover. A double-roller feeding device is provided on the waste inlet, and a waste hopper is provided above the double-roller feeding device. A secondary combustion chamber is connected to the pyrolysis furnace flue outlet. A waste heat boiler membrane wall cylinder is connected to the flue gas outlet. A first segmented membrane wall and a second segmented membrane wall are respectively installed inside the waste heat boiler membrane wall cylinder. The first segmented membrane wall and the left side wall of the waste heat boiler membrane wall cylinder form a first downward heat exchange flue. The first segmented membrane wall and the second segmented membrane wall form a second upward heat exchange flue. The second segmented membrane wall and the right side wall of the waste heat boiler membrane wall cylinder form a third downward heat exchange flue. The first downward heat exchange flue, the second upward heat exchange flue, and the third downward heat exchange flue are connected end-to-end. A horizontal flue is connected to the outlet of the third downflow heat exchange flue. A fourth upflow tail steel flue is connected to the right end of the horizontal flue. A fifth downflow tail steel flue is connected to the top of the fourth upflow tail steel flue. The fourth upflow tail steel flue and the fifth downflow tail steel flue form an inverted U-shape. A flue gas outlet is provided at the lower end of the fifth downflow tail steel flue. A superheater is installed in the third downflow heat exchange flue, and an economizer is installed in the fifth downflow tail steel flue.

[0008] A left ash removal hopper is installed at the bottom of the waste heat boiler membrane wall shell below the junction of the first downflow heat exchange flue and the second upflow heat exchange flue. A right ash removal hopper is installed at the bottom of the waste heat boiler membrane wall shell directly below the third downflow heat exchange flue. A horizontal flue ash removal hopper is installed in the middle of the horizontal flue. A tail flue first ash removal hopper is installed at the right end of the horizontal flue directly below the fourth upflow tail steel flue. A tail flue second ash removal hopper is installed directly below the fifth downflow tail steel flue. A boiler drum is installed at the top of the waste heat boiler membrane wall shell. The first and second segmented membrane walls are both connected to the boiler drum.

[0009] The secondary combustion chamber is mounted on a support frame, on which a floor plate is installed. A front and rear sidewall of the secondary combustion chamber are fixedly mounted on the floor plate. A membrane wall is installed between the top of the front and rear sidewalls. The floor plate, front and rear sidewalls, and membrane wall form a rectangular box-shaped secondary combustion chamber, which is tilted 15 degrees downwards and to the left. A flue gas inlet is located on the lower left side of the secondary combustion chamber. The pyrolysis furnace top cover is located directly below the flue gas inlet. The pyrolysis furnace exhaust port is connected to the secondary combustion chamber exhaust port; a secondary combustion chamber exhaust port is provided at the right end of the secondary combustion chamber, and a waste heat boiler membrane wall cylinder is connected to the secondary combustion chamber exhaust port; a secondary combustion chamber ash removal hopper is connected to the bottom plate of the secondary combustion chamber; secondary air inlets, auxiliary fuel oil burners, and denitrification gun inlets are provided on both the front and rear side walls of the secondary combustion chamber; the upper right end of the top membrane wall is connected to the upper header of the membrane wall, and the lower left end of the top membrane wall is connected to the lower header of the membrane wall; a refractory castable layer is provided below the top membrane wall, and a top insulation layer is provided on the top membrane wall; the upper header of the membrane wall is connected to the boiler drum.

[0010] The pyrolysis furnace body is mounted on an annular furnace body base, which is located at the top of an upper annular support base. The upper annular support base is connected to the top surface of the outer ring of the bearing. The inner ring of the bearing is located on the top surface of a lower annular support base, which is mounted on the furnace body legs. The furnace body legs are mounted on incinerator support columns, which are located in the foundation pit. A cross-shaped grate support beam and the furnace body cylinder are fixedly mounted on the annular furnace body base. A grate swirl is located at the center of the cross-shaped grate support beam. A rotating center support shaft is provided, on which a grate rotation bearing is installed. A radially arranged grate support base is connected to the outer ring of the grate rotation bearing. A tower-shaped grate is installed on the radially arranged grate support base. An outer ring of the grate support base is provided on the outer circle of the radially arranged grate support base. An annular conical rack is provided on the outer ring of the grate support base. A grate rotation drive motor and reducer, a first tapered roller bearing, and a second tapered roller bearing are respectively installed on the furnace body outside the annular conical rack. The furnace grate rotation drive motor and reducer, the first tapered roller bearing and the second tapered roller bearing are arranged at 120° intervals. A first driven bevel gear shaft is installed in the first tapered roller bearing, and a first driven bevel gear is installed on the inner end of the first driven bevel gear shaft. A second driven bevel gear shaft is installed in the second tapered roller bearing, and a second driven bevel gear is installed on the inner end of the second driven bevel gear shaft. A bevel drive gear is connected to the output shaft of the furnace grate rotation drive motor and reducer. The first and second passive bevel gears mesh with the annular bevel rack respectively, and the center lines of the first and second passive bevel gear shafts and the output shafts of the grate rotation drive motor and reducer are on the same horizontal plane; the tower-shaped grate is composed of concentric multi-layer annular grate bars stacked in a conical shape, and the angle between the top inclined surface of the annular grate bars and the horizontal plane is 20 degrees; an air outlet channel is formed between two adjacent annular grate bars, and the angle between the air outlet channel and the horizontal plane is 20 degrees.

[0011] Slag scraping plates are installed at equal intervals of 90 degrees on the inclined surface at the top of each layer of annular grate. On the conical vertical surface of the tower grate, the slag scraping plates on each layer of annular grate are shaped like four windmill impellers. A bottom material layer is provided on the tower grate, and an incineration waste layer is provided on the top horizontal surface of the bottom material layer.

[0012] This invention provides a small-to-medium-scale waste incineration boiler suitable for urban use, which reduces the heat loss on ignition rate of waste incineration, solves the problems of difficult maintenance and short continuous use cycle of the ash removal machine, and effectively solves the problem of easy collapse of the furnace top of the secondary combustion chamber, reduces the ash accumulation on the heated surface during operation, and extends the continuous use cycle of the equipment. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention from a top view. Figure 3 This is a schematic diagram of the structure of the secondary combustion chamber and the membrane wall of the waste heat boiler of the present invention; Figure 4 yes Figure 3 Sectional view along line AA in the middle; Figure 5 This is a schematic diagram of the grate mechanism of the present invention; Figure 6 This is a schematic diagram of the grate mechanism of the present invention from a top view. Detailed Implementation

[0014] The present invention will now be described in detail with reference to the accompanying drawings: A solid waste pyrolysis gasification incineration boiler includes a rotatable pyrolysis furnace body 1, a furnace top cover 25, a secondary combustion chamber 6, a waste heat boiler membrane wall shell 8, a horizontal flue 14, a first upward tail steel flue 15, and a second downward tail steel flue 16. The furnace top cover 25 is fixedly installed above the top port of the rotatable pyrolysis furnace body 1. A waste inlet 2 and a pyrolysis furnace exhaust outlet 5 are respectively provided on the furnace top cover 25. A double roller feeder 3 is provided on the waste inlet 2, and a waste hopper 4 is provided above the double roller feeder 3. A connection is made to the pyrolysis furnace exhaust outlet 5. There is a secondary combustion chamber 6. A waste heat boiler membrane wall cylinder 8 is connected to the flue gas outlet 7 of the secondary combustion chamber 6. A first segmented membrane wall 9 and a second segmented membrane wall 10 are respectively installed inside the waste heat boiler membrane wall cylinder 8. The first segmented membrane wall 9 and the left side wall of the waste heat boiler membrane wall cylinder 8 form a first downward heat exchange flue 11. The first segmented membrane wall 9 and the second segmented membrane wall 10 form a second upward heat exchange flue 12. The second segmented membrane wall 10 and the right side wall of the waste heat boiler membrane wall cylinder 8 form a third downward heat exchange flue 13. The first downward heat exchange flue 11... The second upward heat exchange flue 12 and the third downward heat exchange flue 13 are connected end to end. A horizontal flue 14 is connected to the outlet of the third downward heat exchange flue 13. A fourth upward tail steel flue 15 is connected to the right end of the horizontal flue 14. A fifth downward tail steel flue 16 is connected to the top of the fourth upward tail steel flue 15. The fourth upward tail steel flue 15 and the fifth downward tail steel flue 16 form an inverted U-shape. A flue outlet 22 is provided at the lower end of the fifth downward tail steel flue 16. A superheater 23 is installed in the third downward heat exchange flue 13. An economizer 24 is installed in the steel flue 16 at the tail end. After the flue gas from the secondary combustion chamber enters the furnace body from the boiler flue gas inlet, it flows from top to bottom along the first downward heat exchange flue 11. After turning at the bottom of the furnace, it flows upward along the second upward heat exchange flue 12. When the flue gas flows through these two vertical channels, the dust in it can be separated and settled by gravity. When it passes the right-angle bend at the bottom, the dust will be separated by inertia and fall into the left ash removal hopper 17. This effectively reduces the amount of dust entering the third flue and reduces the ash accumulation in the internal convection pipe.

[0015] A left ash removal hopper 17 is installed at the bottom of the waste heat boiler membrane wall cylinder 8 below the junction of the first downflow heat exchange flue 11 and the second upflow heat exchange flue 12. A right ash removal hopper 18 is installed at the bottom of the waste heat boiler membrane wall cylinder 8 directly below the third downflow heat exchange flue 13. A horizontal flue ash removal hopper 19 is installed in the middle of the horizontal flue 14. A tail flue first ash removal hopper 20 is installed at the right end of the horizontal flue 14 directly below the fourth upflow tail steel flue 15. A tail flue second ash removal hopper 21 is installed directly below the fifth downflow tail steel flue 16. A boiler drum 36 is installed at the top of the waste heat boiler membrane wall cylinder 8. The first segmented membrane wall 9 and the second segmented membrane wall 10 are both connected to... The boiler drums 36 are connected together; the waste heat boiler cavity adopts a membrane wall channel, and the tail flue is a flue made of welded steel plates, with good overall sealing performance and very low air leakage rate; the high-temperature and medium-temperature superheater tube bank of the waste heat boiler is made of TP347H material, which can effectively reduce high-temperature corrosion of flue gas and extend the service life of the superheater tube bank; the tail flue of the waste heat boiler is designed with a diversion flue. On the one hand, the dust in the flue gas continues to use its own gravity to separate and settle into the ash hopper, reducing the amount of dust entering the tail flue; on the other hand, it changes the flue gas flow direction, which is conducive to the self-cleaning of the tail flue. The reduction of ash amount weakens low-temperature corrosion, thus greatly extending the service life of the economizer tube bank.

[0016] A secondary combustion chamber 6 is mounted on a secondary combustion chamber support frame 26. A secondary combustion chamber bottom plate 27 is mounted on the support frame 26. A front side wall 29 and a rear side wall 38 of the secondary combustion chamber are fixedly mounted on the bottom plate 27. A top membrane wall 30 is provided between the top of the front side wall 29 and the top of the rear side wall 38. The secondary combustion chamber bottom plate 27, the front side wall 29, the rear side wall 38, and the top membrane wall 30 form a rectangular box-shaped secondary combustion chamber 6, which is inclined downwards and to the left at a 15-degree angle. A secondary combustion chamber inlet 31 is provided on the lower left side of the secondary combustion chamber 6. A pyrolysis furnace top cover 25 is provided directly below the secondary combustion chamber inlet 31. The pyrolysis furnace exhaust port 5 on the top cover 25 of the pyrolysis furnace is connected to the secondary combustion chamber exhaust port 31; a secondary combustion chamber exhaust port 37 is provided at the right end of the secondary combustion chamber, and a waste heat boiler membrane wall cylinder 8 is connected to the secondary combustion chamber exhaust port 37; a secondary combustion chamber ash removal hopper 28 is connected to the bottom plate 27 of the secondary combustion chamber; a secondary air inlet 34, an auxiliary fuel oil burner 35, and a denitrification gun inlet 36 are respectively provided on the front side wall 29 of the secondary combustion chamber; the upper right end of the top membrane wall 30 is connected to the membrane wall upper header 33, the lower left end of the top membrane wall 30 is connected to the membrane wall lower header 32, a refractory castable layer 39 is provided below the top membrane wall 30, and a top insulation layer 40 is provided on the top membrane wall 30; the membrane wall upper header 33... 3. It is connected to the boiler drum 36; a secondary combustion chamber ash hopper 28 is connected to the bottom plate 27 of the secondary combustion chamber. Multiple secondary combustion chamber ash hoppers 28 are generally arranged at intervals on the bottom plate 27 of the secondary combustion chamber to ensure that the ash after combustion in the secondary combustion chamber is discharged into the nearest ash hopper in a timely manner; a secondary air inlet 34, an auxiliary fuel oil burner 35, and a denitrification gun inlet 36 are respectively arranged on the front side wall 29 of the secondary combustion chamber. The secondary air inlet 34 supplies air to the secondary combustion chamber to provide oxygen for combustion. The auxiliary fuel oil burner 35 assists the combustion in the secondary combustion chamber. The denitrification gun is inserted through the denitrification gun inlet 36 for denitrification; the top membrane wall 30 serves as the top stiffening mechanism of the secondary combustion chamber, which enhances the strength of the top of the secondary combustion chamber. This design overcomes the defect of easy collapse at the top and can also absorb the heat in the secondary combustion chamber through the top membrane wall 30 and convert it into hot water energy. The secondary combustion chamber is arranged at an angle, with the bottom ash hoppers, the connection between the pyrolysis gasification incinerator and the secondary combustion chamber, and the connection between the secondary combustion chamber and the waste heat boiler all inclined at a certain angle, which is conducive to the ash sliding to the ash hopper by itself. Six secondary air inlets are arranged on both sides of the secondary combustion chamber to ensure that the secondary air enters evenly and stably, so that the combustible components in the pyrolysis gas are fully burned and the heat recovery rate of the subsequent equipment is improved. The secondary combustion chamber is equipped with an oil and gas burner inlet. The connected oil and gas burner can maintain the temperature of the secondary combustion chamber above 850°C for more than 3 seconds through its own combustion head adjustment, so as to effectively remove dioxins in the flue gas.The denitrification nozzle connected to the SNCR inlet port, when operated with ammonia or urea solution, can effectively reduce NOx in the flue gas, achieving high denitrification efficiency and realizing the harmless treatment of waste incineration. Interfaces such as flue gas temperature and pressure measurement ports, connected to thermocouples and pressure transmitters, enable automated control of waste incineration through remote DCS monitoring.

[0017] The pyrolysis furnace body 1 is mounted on an annular furnace base 48, which is located at the top of an upper annular support base 47. The upper annular support base 47 is connected to the top surface of the outer ring 46 of the bearing. The inner ring 5 of the bearing is located on the top surface of a lower annular support base 44, which is mounted on furnace body legs 43. The furnace body legs 43 are mounted on incinerator support columns 42, which are located in a pit 41. A cross-shaped grate support beam 49 and a furnace body cylinder 57 are fixedly mounted on the annular furnace base 48. A grate rotation center support shaft 5 is located at the center of the cross-shaped grate support beam 49. A grate rotation bearing 51 is installed on the grate rotation center support shaft 50. A radially arranged grate support base 52 is connected to the outer ring of the grate rotation bearing 51. A tower-shaped grate 53 is installed on the radially arranged grate support base 52. A grate support base outer ring 68 is installed on the outer circle of the radially arranged grate support base 52. An annular conical rack 54 is installed on the outer ring 68 of the grate support base. A grate rotation drive motor and reducer 56, a first tapered roller bearing 59, and a second tapered roller bearing 61 are respectively installed on the furnace body cylinder 57 outside the annular conical rack 54. The first tapered roller bearing 59 and the second tapered roller bearing 61 are equally spaced at 120 arc degrees. The first tapered roller bearing 59 can also be a first grate support device, and the second tapered roller bearing 61 can also be a second grate support device. A first driven bevel gear shaft 58 is provided in the first tapered roller bearing 59, and a first driven bevel gear 69 is provided on the inner end of the first driven bevel gear shaft 58. A second driven bevel gear shaft 60 is provided in the second tapered roller bearing 61, and a second driven bevel gear 70 is provided on the inner end of the second driven bevel gear shaft 60. A tapered bevel gear 70 is connected to the output shaft of the grate rotation drive motor and reducer 56. The drive gear 55, the bevel drive gear 55, the first driven bevel gear 69, and the second driven bevel gear 70 are respectively meshed with the annular bevel rack 54. Furthermore, the center lines of the first driven bevel gear shaft 58, the second driven bevel gear shaft 60, and the output shaft of the grate rotation drive motor and reducer 56 are on the same horizontal plane. The tower-shaped grate 53 is composed of concentric multi-layer annular grate bars 62 stacked in a conical shape. The angle between the inclined surface 63 at the top of the annular grate bar 62 and the horizontal plane is 20 degrees. An air outlet channel 65 is formed between two adjacent annular grate bars 62, and the angle between the air outlet channel 65 and the horizontal plane is 20 degrees.When the grate rotation drive motor and reducer 56 are started, the grate rotation drive motor drives the conical drive gear 55 to rotate. The conical drive gear 55 meshes with the annular conical rack 54, causing the grate support frame 52 to rotate. As the grate support frame 52, the outer ring 68 of the grate support frame, and the annular conical rack 54 rotate, the first passive conical gear 69 and the second passive conical gear 70 respectively achieve passive rotation by meshing with the annular conical rack 54. During this process, the entire rotating grate... The supporting base and the tower-shaped grate 53 on it are supported by a drive motor fixed to the furnace body 57 and two tapered roller bearings. Three gear shafts on the same horizontal plane provide stable support for the rotating grate supporting base and the tower-shaped grate 53, preventing tilting and jamming. This allows the tower-shaped grate 53 to rotate within the furnace body 57, and the tower-shaped grate 53 and the furnace bottom material layer 67 above it to move relative to each other, thereby achieving slag breaking and discharge in the furnace bottom material.

[0018] Slag scraping plates 64 are provided at equal intervals of 90 arcs on the inclined surface 63 at the top of each layer of annular grate 62. That is, slag scraping plates 64 are provided on the inclined annular grate surface to effectively remove slag. On the conical vertical surface of the tower grate 53, the slag scraping plates 64 on each layer of annular grate 62 are in the shape of four windmill impellers. A bottom material layer 66 is provided on the tower grate 53, and an incineration waste layer 67 is provided on the top horizontal surface of the bottom material layer 66.

Claims

1. A solid waste pyrolysis gasification incineration boiler, comprising a rotatable pyrolysis furnace body (1), a furnace top cover (25), a secondary combustion chamber (6), a waste heat boiler membrane wall cylinder (8), a horizontal flue (14), a first upward tail steel flue (15), and a second downward tail steel flue (16); the furnace top cover (25) is fixedly installed above the top port of the rotatable pyrolysis furnace body (1), and a waste inlet (2) and a pyrolysis furnace flue outlet (5) are respectively provided on the furnace top cover (25), a double roller feeder (3) is provided on the waste inlet (2), and a waste hopper (4) is provided above the double roller feeder (3); characterized in that, A secondary combustion chamber (6) is connected to the flue gas outlet (5) of the pyrolysis furnace. A waste heat boiler membrane wall cylinder (8) is connected to the flue gas outlet (7) of the secondary combustion chamber (6). A first segmented membrane wall (9) and a second segmented membrane wall (10) are respectively provided inside the waste heat boiler membrane wall cylinder (8). The first segmented membrane wall (9) and the left side wall of the waste heat boiler membrane wall cylinder (8) form a first downward heat exchange flue (11). The first segmented membrane wall (9) and the second segmented membrane wall (10) form a second upward heat exchange flue (12). The second segmented membrane wall (10) and the right side wall of the waste heat boiler membrane wall cylinder (8) form a third downward heat exchange flue (13). The first downward heat exchange flue (11), the second segmented membrane wall (9), the second segmented membrane wall (10), and the third downward heat exchange flue (13) form a third downward heat exchange flue (13). The second upward heat exchange flue (12) and the third downward heat exchange flue (13) are connected end to end. A horizontal flue (14) is connected to the outlet of the third downward heat exchange flue (13). A fourth upward tail steel flue (15) is connected to the right end of the horizontal flue (14). A fifth downward tail steel flue (16) is connected to the top of the fourth upward tail steel flue (15). The fourth upward tail steel flue (15) and the fifth downward tail steel flue (16) are inverted U-shaped. A flue gas outlet (22) is provided at the lower end of the fifth downward tail steel flue (16). A superheater (23) is provided in the third downward heat exchange flue (13), and an economizer (24) is provided in the fifth downward tail steel flue (16).

2. The solid waste pyrolysis gasification incineration boiler according to claim 1, characterized in that, A bottom left ash removal hopper (17) is provided at the bottom of the waste heat boiler membrane wall cylinder (8) below the junction of the first down heat exchange flue (11) and the second up heat exchange flue (12). A bottom right ash removal hopper (18) is provided at the bottom of the waste heat boiler membrane wall cylinder (8) directly below the third down heat exchange flue (13). A horizontal flue ash removal hopper (19) is provided in the middle of the horizontal flue (14). A tail flue first ash removal hopper (20) is provided at the right end of the horizontal flue (14) directly below the fourth up tail steel flue (15). A tail flue second ash removal hopper (21) is provided directly below the fifth down tail steel flue (16). A boiler drum (36) is provided at the top of the waste heat boiler membrane wall cylinder (8). The first segmented membrane wall (9) and the second segmented membrane wall (10) are both connected to the boiler drum (36).

3. A solid waste pyrolysis gasification incineration boiler according to claim 1 or 2, characterized in that, The secondary combustion chamber (6) is set on the secondary combustion chamber support frame (26). A secondary combustion chamber bottom plate (27) is set on the secondary combustion chamber support frame (26). A secondary combustion chamber front side wall (29) and a secondary combustion chamber rear side wall (38) are fixedly set on the secondary combustion chamber bottom plate (27). A top membrane wall (30) is set between the top of the secondary combustion chamber front side wall (29) and the top of the secondary combustion chamber rear side wall (38). The secondary combustion chamber bottom plate (27), the secondary combustion chamber front side wall (29), the secondary combustion chamber rear side wall (38) and the top membrane wall (30) form a rectangular box-shaped secondary combustion chamber (6). The secondary combustion chamber is set at a 15-degree angle to the lower left. A secondary combustion chamber flue gas inlet (31) is set on the lower surface of the left end of the secondary combustion chamber (6). A pyrolysis furnace top cover (25) is set directly below the secondary combustion chamber flue gas inlet (31). 5) The flue gas outlet (5) of the pyrolysis furnace is connected to the flue gas inlet (31) of the secondary combustion chamber; a flue gas outlet (37) of the secondary combustion chamber is provided at the right end of the secondary combustion chamber, and a waste heat boiler membrane wall shell (8) is connected to the flue gas outlet (37); a secondary combustion chamber ash removal hopper (28) is connected to the bottom plate (27) of the secondary combustion chamber; a secondary air inlet (34) and an auxiliary air inlet (35) are respectively provided on the front side wall (29) of the secondary combustion chamber. The oil burner (35) and the denitrification gun inlet (36) are connected; the upper right end of the top membrane wall (30) is connected to the upper header (33) of the membrane wall, the lower left end of the top membrane wall (30) is connected to the lower header (32) of the membrane wall, a refractory castable layer (39) is provided under the top membrane wall (30), and a top insulation layer (40) is provided on the top membrane wall (30); the upper header (33) of the membrane wall is connected to the boiler drum (36).

4. A solid waste pyrolysis gasification incineration boiler according to claim 3, characterized in that, The pyrolysis furnace body (1) is set on the annular furnace body base (48), which is set on the top of the upper annular support base (47). The upper annular support base (47) is connected to the top surface of the bearing outer ring (46) of the bearing. The bearing inner ring (5) is set on the top surface of the lower annular support base (44), which is set on the furnace body support leg (43). The furnace body support leg (43) is set on the incinerator support column (42), which is set in the foundation pit (41). A cross-shaped grate support beam (49) and a furnace body cylinder (57) are fixedly set on the annular furnace body base (48). A grate rotation center support shaft (50) is provided at the center of the furnace. A grate rotation bearing (51) is provided on the grate rotation center support shaft (50). A radially arranged grate support base frame (52) is connected to the outer ring of the grate rotation bearing (51). A tower-shaped grate (53) is provided on the radially arranged grate support base frame (52). A grate support base outer ring (68) is provided on the outer circle of the radially arranged grate support base frame (52). An annular conical rack (54) is provided on the outer ring (68). A grate rotation drive motor and reducer (56) and a first tapered roller bearing (59) are respectively provided on the furnace body cylinder (57) outside the annular conical rack (54). The grate rotation drive motor and reducer (56), the first tapered roller bearing (59), and the second tapered roller bearing (61) are arranged at 120 arc degrees apart. A first driven bevel gear shaft (58) is provided in the first tapered roller bearing (59), and a first driven bevel gear (69) is provided on the inner end of the first driven bevel gear shaft (58). A second driven bevel gear shaft (60) is provided in the second tapered roller bearing (61), and a second driven bevel gear (70) is provided on the inner end of the second driven bevel gear shaft (60). A bevel drive gear (55) is connected to the output shaft of the grate rotation drive motor and reducer (56). The drive gear (55), the first passive bevel gear (69), and the second passive bevel gear (70) mesh with the annular bevel rack (54) respectively. The center line of the first passive bevel gear shaft (58), the center line of the second passive bevel gear shaft (60), and the center line of the output shaft of the grate rotation drive motor and reducer (56) are on the same horizontal plane. The tower grate (53) is composed of concentric multi-layer annular grate bars (62) stacked in a conical shape. The angle between the top inclined surface (63) of the annular grate bars (62) and the horizontal plane is 20 degrees. An air outlet channel (65) is formed between two adjacent annular grate bars (62) and the horizontal plane is 20 degrees.

5. A solid waste pyrolysis gasification incineration boiler according to claim 4, characterized in that, Slag scraping plates (64) are provided at equal intervals of 90 arc degrees on the inclined surface (63) at the top of each layer of annular grate (62). On the conical vertical surface of the tower grate (53), the slag scraping plates (64) on each layer of annular grate (62) are in the shape of four windmill impellers. A bottom material layer (66) is provided on the tower grate (53), and an incineration waste layer (67) is provided on the top horizontal surface of the bottom material layer (66).

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