Garbage cracking reaction kettle and anti-axle stuck method

Abstract

The invention relates to a garbage pyrolysis reactor and a method for preventing shaft from being stuck, and belongs to the technical field of garbage pyrolysis reactors. The garbage pyrolysis reactor is arranged on a machine frame welded by profile steel and comprises a reactor body, a feeding section, a reactor main section and a discharging section which are coaxially and sealingly connected together from top to bottom, and the reactor main section is a hot pyrolysis reactor for garbage materials. The upper part of the reactor body is mounted on the machine frame through peripheral bolts. A stirring shaft is vertically and centrally sealingly penetrated through the reactor body and can stir the internal garbage materials. The stirring shaft has gaps at the penetrated bottom plate and top plate. The upper and lower ends of the stirring shaft are respectively mounted on the machine frame through a top bearing seat and a bottom bearing seat. The top end of the stirring shaft is connected with the output shaft of a speed reducer motor through a coupling, and the speed reducer motor is mounted on the top of the machine frame. The invention adopts a stirring shaft support point and a pyrolysis reactor body separation mode, and reduces the influence of the deformation of the reactor body on the stirring shaft.

Description

Technical Field

[0001] This invention relates to the field of waste pyrolysis reactor technology, and in particular to a waste pyrolysis reactor and a method for preventing shaft jamming. Background Technology

[0002] Waste pyrolysis is a high-temperature decomposition process in waste treatment under anaerobic or hypoxic conditions. After sorting, household waste and organic solid waste are sent into a closed pyrolysis reactor and heated to 400-800°C under anaerobic or very low oxygen conditions. The organic matter in the waste undergoes thermochemical decomposition, generating three products: combustible gas, tar, oil, organic acids, and carbon black.

[0003] However, to achieve uniform pyrolysis of waste materials, an agitator shaft is needed to stir the materials within the pyrolysis reactor. However, the reactor's cylinder wall is a welded structure, and the agitator shaft is a vertical, continuous component passing through the reactor. During normal operation, the temperature reaches as high as 500 degrees Celsius. At this temperature, the reactor body deforms due to heat, and the amount and direction of this deformation are uncontrollable. Simultaneously, the agitator shaft also deforms, often uncontrollably. Both types of deformation can cause the agitator shaft to jam at the normally fitted clearance, preventing it from rotating, rendering it unable to stir, and damaging the motor.

[0004] To overcome the above problems, a waste pyrolysis reactor is needed. Summary of the Invention

[0005] The purpose of this invention is to provide a waste pyrolysis reactor that adopts a separation method between the stirring shaft support point and the reactor body, thereby reducing the impact of reactor body deformation on the stirring shaft.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This invention discloses a waste pyrolysis reactor, mounted on a welded steel frame, comprising: The vessel body includes a feeding section, a main reactor section, and a discharge section that are coaxially and sealed together from top to bottom. The main reactor section is a pyrolysis reaction vessel for waste materials. The upper part of the vessel body is mounted on the frame by external bolts. A stirring shaft, vertically centered and sealed through the vessel body, is used to stir the internal waste material. The stirring shaft leaves gaps at the bottom and top plates through which it passes. The upper and lower ends of the stirring shaft are respectively mounted to the frame via top and bottom bearing seats. The top end of the stirring shaft is connected to the output shaft of a geared motor via a coupling. The geared motor is mounted on the top of the frame.

[0007] The technical solution of this invention is a new product development by the applicant after entering the field of waste treatment equipment technology. It is a new type of equipment that is innovatively improved based on the adverse effects of thermal deformation that are prone to occur in existing waste pyrolysis reactors. The prototype has been completed and the next step is to test its actual operation effect.

[0008] Furthermore, the top and bottom openings of the main section of the reactor are surrounded by a full ring of interface flange plates, the bottom of the feeding section is provided with a flange plate, and the top of the discharging section is provided with a flange plate. The feeding section, the main section of the reactor, and the discharging section are connected together by flange bolts. The flange bolts on the interface flange plate at the top of the main section of the reactor are used to install the reactor body onto the frame.

[0009] Furthermore, it also includes sealing components, with two sets of the sealing components respectively disposed at the upper and lower ends of the vessel body, and used to seal the gap at the through position of the stirring shaft.

[0010] Furthermore, the sealing assembly includes a sealing seat and a flexible sleeve fitted onto the stirring shaft. One end of the flexible sleeve is sealed and fixed to the bottom plate or top plate of the vessel body, and the other end is sealed to the bottom port or top port of the sealing seat. The sealing seat is installed on the frame and can seal the radial clearance of the stirring shaft.

[0011] Furthermore, the hose sleeve is a metal bellows with upper and lower flanges; the sealing seat is sealed using a high-temperature resistant packing seal.

[0012] Furthermore, the top plate of the vessel body is provided with a top sleeve port at the position where the stirring shaft passes through, and the lower flange of the hose sleeve is sealed to the top flange of the top sleeve port.

[0013] Furthermore, the shaft end of the stirring shaft is mounted in the top bearing housing via bearing one, and the shaft end of the stirring shaft is axially locked to the inner ring of bearing one by a nut mounted on a fine thread section.

[0014] Furthermore, the bearing is specifically a tapered roller bearing.

[0015] Furthermore, the bottom bearing housing supports the shaft end of the stirring shaft via a second bearing, and the inner ring of the second bearing is axially locked by a pressure cap on the end face; the outer ring of the second bearing can slide axially within the central hole of the bottom bearing housing.

[0016] The stirring shaft is installed at two points, with the top bearing serving a load-bearing function and the bottom bearing providing floating adjustment and radial support. This ensures the normal operation of the stirring shaft and prevents thermal deformation and jamming.

[0017] The present invention also discloses a method for preventing shaft jamming in a waste pyrolysis reactor, which is used on any of the above-mentioned waste pyrolysis reactors. The reactor body and the stirring shaft are assembled by separating the support points of the reactor body and the stirring shaft. Both the reactor body and the stirring shaft are installed by fixing the upper part and freeing the lower part.

[0018] Compared with the prior art, the beneficial technical effects of the present invention are as follows: This invention relates to a waste pyrolysis reactor, whose vessel body is composed of three coaxially connected sections: a feeding section, a main reactor section, and a discharge section. This facilitates disassembly and maintenance and reduces equipment costs. By installing the top and bottom bearing seats at both ends of the stirring shaft onto the frame, rather than onto the top and bottom plates of the reactor body, separation is achieved. This prevents the coaxiality of the top and bottom bearing seats from being affected by significant thermal deformation of the reactor body, thus avoiding stirring shaft jamming. The waste pyrolysis reactor of this invention employs a separation method between the stirring shaft support point and the pyrolysis reactor body, reducing the impact of reactor body deformation on the stirring shaft.

[0019] Furthermore, by bolting the interface flange plate at the top of the main section of the reactor to the frame, the upper part of the reactor body can be hoisted. Even if thermal deformation occurs, it is mainly downward free deformation, and under the influence of the reactor body's own weight, there will be no large skew deformation. By adding a flexible hose between the sealing seat and the end plate of the reactor body, the axial clearance can be protected and sealed. On the other hand, it can compensate for the axial distance when the reactor body undergoes thermal deformation, and it also ensures that the sealing seat matches the sealing shaft section far from the deformation zone. The thermal deformation of the sealing shaft section is small, and it will not cause the packing to loosen and leak. By adding a top sleeve opening on the top plate of the reactor body, the clearance length can be increased, reducing the intensity of heat transfer upward, thereby keeping the sealing seat in a relatively low-temperature working environment. By suspending the agitator shaft with bearing one, the agitator shaft can freely extend and retract downward after thermal deformation, driving bearing two to slide up and down in the central hole of the bottom bearing seat, preventing axial jamming. Moreover, this suspension installation method allows the agitator shaft to automatically correct itself under its own weight even if it undergoes slight radial deformation.

[0020] The present invention provides a method for preventing shaft jamming in a waste pyrolysis reactor. During the design and assembly stages, a reasonable structure is adopted to release the thermal deformation of the reactor body and the stirring shaft, reducing the impact of thermal deformation on the normal operation of the pyrolysis reactor, making it highly stable, with a long service life, and reducing maintenance costs. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] Figure 1This is a schematic diagram of the main cross-sectional view of the waste pyrolysis reactor of the present invention; Figure 2 This is a schematic diagram of the main structure of the stirring shaft in this invention; Figure 3 This is a schematic diagram of the upper installation structure of the stirring shaft of the waste pyrolysis reactor of the present invention; Figure 4 This is a partial cross-sectional view of the bottom bearing seat in this invention.

[0023] Explanation of reference numerals in the attached figures: 100. Feeding section; 110. Feeding port; 120. Top sleeve port; 130. Exhaust port; 200. Main section of the reactor; 210. Interface flange plate; 300. Discharge section; 310. Ash discharge port; 400. Stirring shaft; 410. Coupling joint; 420. Top bearing section; 430. Stirring section; 440. Sealed shaft section; 450. Bottom bearing section; 500. Gear motor; 600. Coupling; 700. Top bearing housing; 710. Bearing 1; 800. Bottom bearing housing; 810. Bearing II; 820. Pressure cap; 830. Retaining cover; 900, Sealing seat; 1000, hose sleeve. Detailed Implementation

[0024] The core of this invention is to provide a waste pyrolysis reactor that adopts a separation method between the stirring shaft support point and the reactor body, thereby reducing the impact of reactor body deformation on the stirring shaft.

[0025] 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 a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0026] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", 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.

[0027] Refer to the attached diagram. Figure 1 This is a schematic diagram of the main cross-sectional view of the waste pyrolysis reactor of the present invention; Figure 2 This is a schematic diagram of the main structure of the stirring shaft in this invention; Figure 3 This is a schematic diagram of the upper installation structure of the stirring shaft of the waste pyrolysis reactor of the present invention; Figure 4 This is a partial cross-sectional view of the bottom bearing seat in this invention.

[0028] In one specific embodiment of the present invention, such as Figures 1-4 As shown, the waste pyrolysis reactor of the present invention is mounted on a frame welded from structural steel and includes: The reactor body comprises a feed section 100, a main reactor section 200, and a discharge section 300, all coaxially and sealed together from top to bottom. All three are cylindrical shells. The feed section 100 has a feed port 110 and an exhaust port 130 on its side wall. An induction coil is installed on the outer wall of the main reactor section 200, capable of inductively heating this part of the cylindrical shell; this part serves as the main pyrolysis reaction vessel for the waste material. An ash discharge port 310 is provided on the side wall of the discharge section 300. The upper part of the reactor body is mounted to the frame via external bolts.

[0029] A stirring shaft 400, vertically centered and sealed through the reactor body, is used to stir the internal waste material. The stirring shaft 400 has large radial clearances at the bottom and top plates it passes through. The upper and lower ends of the stirring shaft 400 are mounted to the frame via top bearing seats 700 and bottom bearing seats 800, respectively. The top end of the stirring shaft 400 is connected to the output shaft of the geared motor 500 via a coupling 600. The coupling connector 410 of the stirring shaft 400 is inserted into the bottom hole of the coupling 600 and connected via a flat key. The geared motor 500 is mounted on the top of the frame via a side seat plate of the gearbox housing. A stirring section 430 is located in the middle of the stirring shaft 400, corresponding to the main section 200 of the reactor, where stirring fins are used to stir the waste material.

[0030] Specifically, the radial gap between the stirring shaft 400 and the bottom and top plates is on the order of millimeters, which is a large gap, to avoid hard friction between the vessel body and the stirring shaft 400 when thermal deformation occurs.

[0031] The reactor body, composed of three coaxially connected sections—feed section 100, main reactor section 200, and discharge section 300—facilitates disassembly and maintenance, and reduces equipment costs. By installing the top bearing seats 700 and bottom bearing seats 800 at both ends of the stirring shaft 400 onto the frame, rather than onto the top and bottom plates of the reactor body, separation is achieved. This prevents the coaxiality of the top bearing seats 700 and bottom bearing seats 800 from being affected by significant thermal deformation of the reactor body, thus avoiding the possibility of the stirring shaft 400 becoming stuck. This invention's waste pyrolysis reactor, employing a separation of the stirring shaft support point and the reactor body, reduces the impact of reactor body deformation on the stirring shaft.

[0032] In one specific embodiment of the present invention, such as Figure 1 As shown, the top and bottom openings of the main reactor section 200 are surrounded by a full ring of interface flange plates 210. The bottom of the feed section 100 has a flange plate, and the top of the discharge section 300 has a flange plate. The feed section 100, the main reactor section 200, and the discharge section 300 are connected together by flange bolts. High-temperature resistant gaskets are pressed between the flange plates to seal the gaps. Flange bolts on the interface flange plate 210 at the top of the main reactor section 200 fix the reactor body to the frame.

[0033] That is, the entire vessel body is fixedly connected to the frame only through flange bolts here, which reduces the impact of thermal stress deformation.

[0034] By bolting the interface flange plate 210 at the top of the main section 200 of the reactor to the frame, the upper part of the reactor body can be hoisted. Even if there is thermal deformation, it is mainly downward free deformation. Under the influence of the reactor body's own weight, there will be no large skew deformation.

[0035] In one specific embodiment of the present invention, such as Figure 1 and Figure 3 As shown, the waste pyrolysis reactor of the present invention also includes a sealing assembly. Two sets of the sealing assemblies are respectively arranged at the upper and lower ends of the reactor body and are used to seal the gap at the through position of the stirring shaft 400.

[0036] Specifically, such as Figure 1 and Figure 3 As shown, the sealing assembly includes a sealing seat 900 and a flexible hose sleeve 1000 fitted onto the stirring shaft 400. One end of the flexible hose sleeve 1000 is sealed and fixed to the bottom or top plate of the vessel body, and the other end is sealed to the bottom or top port of the sealing seat 900. The sealing seat 900 is mounted on the frame and can seal the radial clearance of the stirring shaft 400 without affecting the rotation of the stirring shaft 400.

[0037] By adding a flexible sleeve 1000 between the sealing seat 900 and the end plate of the vessel body, the axial clearance can be protected and sealed. On the other hand, it can compensate for the axial distance when the vessel body undergoes thermal deformation. Moreover, it allows the sealing seat 900 to cooperate with the sealing shaft section 440 which is far from the deformation zone. The thermal deformation of the sealing shaft section 440 is small, which will not cause the packing to loosen and leak air.

[0038] Specifically, such as Figure 1 and Figure 3 As shown, the flexible hose sleeve 1000 is a metal bellows with upper and lower flanges, made of high-quality high-temperature resistant stainless steel. The sealing seat 900 uses a high-temperature resistant packing seal for sealing, and the end opposite to the flexible hose sleeve 1000 is sealed with a gland to compress the packing.

[0039] Specifically, such as Figure 1 and Figure 3 As shown, the top plate of the vessel body is also provided with a top sleeve port 120 at the position where the stirring shaft 400 passes through. The lower flange of the hose sleeve 1000 is sealed to the top flange of the top sleeve port 120, and a high-temperature resistant sealing gasket is provided between the two.

[0040] By adding a top sleeve opening 120 to the top plate of the vessel, the gap length can be increased, the intensity of heat transfer upward can be reduced, and the sealing seat 900 can be kept in a relatively low temperature working environment.

[0041] In one specific embodiment of the present invention, such as Figures 1-3 As shown, the end of the stirring shaft 400 is mounted on the top bearing section 420 via bearing 710 inside the top bearing housing 700. The inner ring of bearing 710 is axially locked by a nut installed on the fine-thread section of the stirring shaft 400.

[0042] Specifically, such as Figure 1 As shown, bearing 710 specifically adopts a tapered roller bearing, which can bear the weight of the entire stirring shaft 400.

[0043] Specifically, such as Figure 1 and Figure 4 As shown, the bottom bearing housing 800 supports the bottom end of the stirring shaft 400 via bearing 810, specifically mounted on the bottom bearing section 450. The inner ring of bearing 810 is axially locked by a cap 820 on its end face, which is mounted on the bottom end face of the stirring shaft 400 by a screw in the middle. The outer ring of bearing 810 can slide axially within the central hole of the bottom bearing housing 800, meaning that the gap between the central hole of the bottom bearing housing 800 and the outer ring of bearing 810 is relatively large, on the order of millimeters.

[0044] Specifically, such as Figure 1 and Figure 4As shown, a cover 830 is also provided at the top port of the bottom bearing housing 800, which seals the radial clearance at the top port of the bottom bearing housing 800.

[0045] By suspending the agitator shaft 400 with bearing 710, the agitator shaft 400 can freely extend and retract downwards after thermal deformation, driving bearing 810 to slide up and down within the central hole of the bottom bearing seat 800, thus preventing axial jamming. Moreover, this suspension installation method allows the agitator shaft 400 to automatically correct itself under its own weight even if it undergoes slight radial deformation.

[0046] The deformation resistance principle of the waste pyrolysis reactor of this invention is as follows: During normal operation of the waste pyrolysis reactor, the induction coil on the outer wall of the main section 200 heats the shell of the main section 200, thereby heating the waste material inside the reactor. The stirring shaft 400 rotates continuously under the drive of the reduction motor 500, stirring the waste material. During this process, the temperature inside the waste pyrolysis reactor cavity is not less than 500 degrees Celsius, therefore both the reactor body and the stirring shaft 400 will experience severe thermal deformation. Since the reactor body is fixedly installed at the upper interface flange plate 210, its axial deformation is mainly released through free downward deformation, without any force, and will not further aggravate the deformation. At the same time, the gap between the stirring shaft 400 and the reactor body is only in the millimeter range, so there will be no hard friction or scraping. The top bearing seat 700 and the bottom bearing seat 800 are detached from the relatively hot reactor body and directly installed on the frame, therefore the thermal deformation of the reactor body will not affect the coaxiality of the top bearing seat 700 and the bottom bearing seat 800. Moreover, the stirring shaft 400 is suspended by the bearing 710 at the top, and can freely extend and retract downwards when deformed by heat, and automatically return to its correct position by its own weight.

[0047] In summary, the waste pyrolysis reactor of this invention, composed of a reactor body consisting of three coaxially connected sections—the feeding section 100, the main reactor section 200, and the discharge section 300—facilitates disassembly and maintenance and reduces equipment costs. By installing the top bearing seats 700 and bottom bearing seats 800 at both ends of the stirring shaft 400 onto the frame, rather than onto the top and bottom plates of the reactor body, separation is achieved. This prevents the coaxiality of the top bearing seats 700 and bottom bearing seats 800 from being affected by significant thermal deformation of the reactor body, thus avoiding jamming of the stirring shaft 400. The waste pyrolysis reactor of this invention, employing a separation of the stirring shaft support point and the reactor body, reduces the impact of reactor body deformation on the stirring shaft. Furthermore, by bolting the interface flange plate 210 at the top of the main reactor section 200 to the frame, the upper part of the reactor body can be hoisted. Even with thermal deformation, it is primarily downward free deformation, and under the influence of the reactor body's own weight, significant skew deformation will not occur. By adding a flexible hose sleeve 1000 between the sealing seat 900 and the end plate of the vessel body, the axial clearance can be protected and sealed. Furthermore, it can compensate for axial distance in the event of thermal deformation of the vessel body. This also ensures that the sealing seat 900 engages with the sealing shaft section 440, which is far from the deformation zone, resulting in less thermal deformation of the sealing shaft section 440 and preventing packing packing from loosening and leaking. Adding a top sleeve opening 120 to the top plate of the vessel body increases the clearance length and reduces the intensity of upward heat transfer, thus keeping the sealing seat 900 in a relatively low-temperature working environment. The agitator shaft 400 is suspended by bearing 710, allowing it to freely extend and retract downwards after thermal deformation, driving bearing 810 to slide up and down within the central hole of the bottom bearing seat 800, preventing axial jamming. Moreover, this suspended installation method allows the agitator shaft 400 to automatically correct itself under its own weight, even if it experiences slight radial deformation.

[0048] The present invention also discloses a method for preventing shaft jamming in a waste pyrolysis reactor, which is used in any of the above embodiments of the waste pyrolysis reactor. The reactor body and the stirring shaft 400 are assembled by separating the support points, and both the reactor body and the stirring shaft 400 are installed by fixing the upper part and freeing the lower part.

[0049] During the design and assembly stages, a reasonable structure is adopted to release the thermal deformation of the vessel body and stirring shaft by 400°, reducing the impact of thermal deformation on the normal operation of the pyrolysis reactor, making it highly stable, with a long service life, and reducing maintenance costs.

[0050] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0051] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A waste pyrolysis reactor, mounted on a welded steel frame, characterized in that, include: The vessel body includes a feed section (100), a main reactor section (200), and a discharge section (300) that are coaxially and sealed together from top to bottom. The main reactor section (200) is a pyrolysis reaction vessel for waste materials. The upper part of the vessel body is mounted on the frame by external bolts. A stirring shaft (400) is vertically centered and sealed through the vessel body, capable of stirring the internal waste material. The stirring shaft (400) has gaps at the bottom and top plates through which it passes. The upper and lower ends of the stirring shaft (400) are respectively mounted on the frame through a top bearing seat (700) and a bottom bearing seat (800). The top end of the stirring shaft (400) is connected to the output shaft of a geared motor (500) through a coupling (600). The geared motor (500) is mounted on the top of the frame.

2. The waste pyrolysis reactor according to claim 1, characterized in that: The top and bottom openings of the main section (200) of the reactor are surrounded by a ring of interface flange plates (210). The bottom of the feed section (100) is provided with a flange plate, and the top of the discharge section (300) is provided with a flange plate. The feed section (100), the main section (200) of the reactor and the discharge section (300) are connected together by flange bolts. The flange bolts on the interface flange plate (210) at the top of the main section (200) of the reactor install the reactor body onto the frame.

3. The waste pyrolysis reactor according to claim 1, characterized in that: It also includes sealing components, with two sets of the sealing components respectively disposed at the upper and lower ends of the vessel body, and used to seal the gap at the through position of the stirring shaft (400).

4. The waste pyrolysis reactor according to claim 3, characterized in that: The sealing assembly includes a sealing seat (900) and a hose sleeve (1000) fitted onto the stirring shaft (400). One end of the hose sleeve (1000) is sealed and fixed to the bottom plate or top plate of the vessel body, and the other end is sealed to the bottom port or top port of the sealing seat (900). The sealing seat (900) is installed on the frame and can seal the radial clearance of the stirring shaft (400).

5. The waste pyrolysis reactor according to claim 4, characterized in that: The hose sleeve (1000) is a metal bellows with upper and lower flanges; the sealing seat (900) is sealed using a high-temperature resistant packing seal.

6. The waste pyrolysis reactor according to claim 5, characterized in that: The top plate of the vessel body is also provided with a top sleeve port (120) at the position where the stirring shaft (400) passes through, and the lower flange of the hose sleeve (1000) is sealed to the top flange of the top sleeve port (120).

7. The waste pyrolysis reactor according to claim 1, characterized in that, The end of the stirring shaft (400) is installed in the top bearing housing (700) via bearing one (710), and the end of the stirring shaft (400) is axially locked to the inner ring of bearing one (710) by a nut installed on a fine thread section.

8. The waste pyrolysis reactor according to claim 7, characterized in that: The bearing 1 (710) is specifically a tapered roller bearing.

9. The waste pyrolysis reactor according to claim 7, characterized in that: The bottom bearing seat (800) supports the shaft end of the stirring shaft (400) through the bearing second (810). The inner ring of the bearing second (810) is axially locked by the end cap (820). The outer ring of the bearing second (810) can slide axially within the central hole of the bottom bearing seat (800).

10. A method for preventing shaft jamming in a waste pyrolysis reactor, characterized in that, When used on the waste pyrolysis reactor according to any one of claims 1 to 9, the reactor body and the stirring shaft (400) are assembled by means of separate support points, and both the reactor body and the stirring shaft (400) are installed by means of fixed upper part and free lower part.

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