Sealing device for rotary pyrolyzing furnace

Abstract

The invention discloses a sealing device for a rotary pyrolyzing furnace, and relates to the technical field of sealing of rotary pyrolyzing furnaces. The sealing device comprises a sealing shaft sleeve fixedly arranged on the rotating component in a sleeving mode and a sealing shell connected with the static component, the sealing shaft sleeve is sleeved with the sealing shell, and an annular air groove is formed in the side, close to the sealing shaft sleeve, of the sealing shell. Two packing assemblies capable of being matched together to seal the annular gas groove are arranged on the two sides of the annular gas groove between the sealing shell and the sealing shaft sleeve, an elastic piece arranged in the axial direction of the rotating component is arranged between the two packing assemblies, and a packing gland for packaging the packing assemblies in the sealing shell is arranged on the side, away from oil gas, of the sealing shell. The sealing shell is further connected with an air pipe communicated with the annular air groove. The sealing device can absorb deformation and movement of the furnace body in the axial direction and the radial direction in the heating and cooling process, the requirement for the low leakage rate of a high-temperature pyrolysis oil gas medium of the rotary pyrolysis furnace in the positive pressure state is met, and the sealing device has the excellent and stable sealing effect.

Description

Technical Field

[0001] The invention belongs to the technical field of sealing of rotary pyrolysis furnaces, and in particular relates to a sealing device for a rotary pyrolysis furnace. Background Art

[0002] The externally heated rotary pyrolysis furnace is a mature and widely used pyrolysis equipment. It has the advantages of good raw material applicability, relatively uniform heating, and relatively simple operation and control. It has been widely used in the field of anaerobic pyrolysis disposal of organic solid waste.

[0003] Due to the movement form and special working conditions, rotary pyrolysis furnaces also face many problems in sealing oil and gas media. On the one hand, the expansion deformation of the rotating cylinder during the heating process requires the sealing device to meet the requirements of strong deformation absorption while being heat-resistant; on the other hand, the pyrolysis reaction will produce explosive gases (CH4, CO, H2, etc.) and a small amount of polluting and harmful gases (H2S, HCl, etc.). The leakage of such media can cause serious accidents or environmental pollution, and puts high requirements on the leakage rate of the sealing device; in addition, since the rotary motion of the pyrolysis furnace body is affected by factors such as processing accuracy, support stability and material turnover, there are often frequent radial runout and axial movement during operation, requiring the sealing device to have good follow-up performance. Summary of the Invention

[0004] In order to solve the problem that the pyrolysis furnace body at present suffers from frequent radial runout and axial movement during operation due to factors such as processing accuracy, support stability and material turnover, the present invention provides a sealing device for a rotary pyrolysis furnace.

[0005] The embodiments of the present invention are achieved through the following technical solutions:

[0006] A sealing device for a rotary pyrolysis furnace comprises a sealing sleeve fixedly sleeved on a rotating component and a sealing shell sealed with a stationary component, the sealing shell gap being sleeved on the sealing sleeve, an annular air groove being provided on the sealing shell close to the sealing sleeve side, two groups of packing assemblies being provided between the sealing shell and the sealing sleeve on both sides of the annular air groove and being able to cooperate to seal the annular air groove, an elastic member being arranged axially along the rotating component being provided between the two groups of packing assemblies, a packing gland being provided on the sealing shell away from the oil and gas side for encapsulating the packing assembly in the sealing shell, an air pipe being connected to the annular air groove being also connected to the sealing shell.

[0007] The sealing device proposed by the present invention uses the combination of a packing gland, a packing assembly and an elastic member to realize contact packing sealing, and at the same time relies on the setting of two sets of packing assemblies to add annular air grooves and air pipes to realize the support of air sealing, that is, through the close contact between the soft packing and the surface of the sealing sleeve and the sealing shell, and supplemented by the back-blowing effect of the pressurized protective gas filled in the annular air groove, the pyrolysis oil and gas medium under positive pressure is sealed, and has good sealing performance, which solves the frequent radial runout and axial movement at the tail of the rotary pyrolysis furnace during operation, and has good follow-up performance. At the same time, a sealing sleeve is added, and the outer circumference of the sleeve is a finely machined surface, which can play a role in contact elimination of the sealing gap between the sealing device and the rotating part, facilitates the sliding of the packing assembly, improves the adaptability of the sealing device to the axial expansion and movement of the rotating part, and has the effect of reducing the wear of the packing assembly and extending the service life.

[0008] In some technical solutions of the present invention, the number of the above-mentioned packing components is at least three groups, the above-mentioned annular air groove is provided between any two groups of packing components, and elastic members are provided between two adjacent groups of packing components.

[0009] This design method can be more flexibly applied to the sealing requirements of different situations.

[0010] In some technical solutions of the present invention, the packing assembly is composed of packing pieces wound 3 to 5 times in a sealed housing, and the packing pieces are woven from a mixture of one or more materials including graphite fiber, ceramic fiber, and metal wire.

[0011] This design can, to a certain extent, guarantee the sealing performance of the packing in a high temperature environment of 600°C.

[0012] In some technical solutions of the present invention, the packing gland is connected to the sealing housing with adjustable gaps through a plurality of gland bolts.

[0013] In this design, the gap distance between the packing gland and the sealing housing can be achieved by rotating the gland bolt, thereby adjusting the force with which the packing gland presses the packing assembly axially, thereby adjusting the degree of radial inward and outward expansion of the packing assembly, so that the packing assembly can still be tightly attached to the inner wall of the sealing sleeve and the sealing housing under different usage conditions or service life, effectively preventing the sealing medium on the oil and gas side from leaking outward.

[0014] In some technical solutions of the present invention, the elastic member includes a pair of first mounting seats and multiple first springs arranged opposite to each other, the two ends of the first springs are respectively arranged in corresponding mounting grooves on the first mounting seats, and the above-mentioned first mounting seats are respectively connected to the packing assemblies on both sides.

[0015] This design method can ensure that the packing assembly has relatively uniform radial stress to a certain extent.

[0016] In some technical solutions of the present invention, the elastic member includes a second spring sleeved on the sealing sleeve, and two second mounting seats respectively arranged on the two groups of the above-mentioned packing assemblies. The second mounting seat is provided with an annular groove coaxial with the second mounting seat on the side close to the second spring, and the two ends of the second spring are respectively arranged in the two annular grooves.

[0017] This design method can ensure that the packing assembly has relatively uniform radial stress to a certain extent.

[0018] In some technical solutions of the present invention, a throttle tooth is provided on one side of the sealing housing close to the sealing sleeve, and the throttle tooth is closer to the oil and gas side than any packing component.

[0019] A throttling tooth is provided at the front end of the sealing housing near the oil and gas side. The maze effect produced by the multi-stage cavity structure formed by adjacent tooth gaps can prevent particulate dust in the pyrolysis oil and gas from entering the sealing gap between the sealing sleeve and the packing assembly, thereby delaying the wear of the sealing surface.

[0020] In some technical solutions of the present invention, there are multiple air pipes, and the sealed shell is evenly spaced along the circumference of the annular air groove to provide multiple air inlet holes connected to the annular air groove. The multiple air pipes and the multiple air inlet holes correspond to each other one by one and are connected to each other.

[0021] The provision of multiple air inlet holes can ensure the stability of the air pressure in the annular air groove to a certain extent.

[0022] In some technical solutions of the present invention, the sealing housing and the stationary component are radially sealed and axially sealed respectively by radial O-rings and axial O-rings. The sealing housing is radially provided with a connecting portion connected to the stationary component by housing bolts. The radial O-ring is arranged at the connecting portion between the housing bolts and the sealing sleeve.

[0023] This design method belongs to the static seal in the sealing device, which can effectively achieve the seal between the sealing shell and the static parts.

[0024] In some technical solutions of the present invention, a pad is provided between the connecting portion and the stationary component, one side of the pad is welded to the stationary component, and the other side is connected to the connecting portion via the housing bolts.

[0025] In this design method, the surface roughness requirements for the stationary parts are transferred to the pad through the design of the pad, making processing more convenient.

[0026] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0027] The packing assembly is tightly attached to the surface of the sealing sleeve by arranging elastic parts and packing glands, and the back-flushing effect of the pressurized protective gas filled in the annular gas groove is supplemented, so that it has good sealing performance for pyrolysis oil and gas media under positive pressure.

[0028] Taking into account the surface accuracy requirements of the packing assembly for the seal, this device adds a sealing sleeve to the periphery of the rotating component. The outer circumference of the sealing sleeve is a finely machined surface, which can eliminate the sealing gap through contact, facilitate the relative sliding between the packing and the cylinder, and improve the adaptability of the sealing device to the axial expansion and movement of the cylinder. At the same time, it has the effect of reducing packing wear and extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic structural diagram of a sealing device for a rotary pyrolysis furnace in one embodiment of the present invention;

[0030] Figure 2 This is a partial structural schematic diagram of a sealing device for a rotary pyrolysis furnace in one embodiment of the present invention;

[0031] Figure 3 This is a second structural schematic diagram of a sealing device for a rotary pyrolysis furnace in an embodiment of the present invention;

[0032] Figure 4 for Figure 1 Schematic diagram of the first mounting base;

[0033] Figure 5 for Figure 3 Schematic diagram of the second mount in FIG.

[0034] Icons: 1-rotating part, 2-sealing sleeve, 3-stationary part, 4-sealing housing, 5-annular air groove, 6-packing assembly, 7-elastic part, 8-packing gland, 9-air pipe, 10-gland bolt, 11-housing bolt, 12-gasket, 13-first spring, 14-first mounting seat, 15-mounting groove, 16-second spring, 17-second mounting seat, 18-annular groove, 19-throttle tooth, 20-inlet hole, 21-radial O-ring, 22-axial O-ring. DETAILED DESCRIPTION

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition or explanation in subsequent drawings.

[0038] In the description of the present invention, it should be noted that if the terms "inside" and "outside" appear to indicate an orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings, or are the orientation or positional relationship in which the product of the invention is usually placed when in use. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0039] It should also be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "dispose," "install," "configure," and "connect" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0040] Example

[0041] Please refer to Figure 1-Figure 5 The present embodiment provides a sealing device for a rotary pyrolysis furnace, comprising a sealing sleeve 2 fixedly sleeved on a rotating component 1 and a sealing shell 4 sealedly connected to a stationary component 3, the sealing shell 4 being sleeved on the sealing sleeve 2 with a gap, an annular air groove 5 being provided on the sealing shell 4 near the sealing sleeve 2, two groups of packing assemblies 6 which can cooperate to seal the annular air groove 5 are provided between the sealing shell 4 and the sealing sleeve 2 on both sides of the annular air groove 5, an elastic member 7 arranged axially along the rotating component 1 is provided between the two groups of packing assemblies 6, a packing gland 8 which encapsulates the packing assembly 6 in the sealing shell 4 is provided on the oil and gas side of the sealing shell 4, and an air pipe 9 which is connected to the annular air groove 5 is also connected to the sealing shell 4.

[0042] The principle of the sealing device: The sealing device in this application is installed in a rotary pyrolysis furnace. The rotating component 1 is a horizontal cylinder, arranged horizontally or at a certain angle. The stationary component 3 is located at the rear end of the rotating component 1, and the rotating component 1 extends a certain distance into the stationary component 3. During the operation of the rotary pyrolysis furnace, the rotating component 1 performs periodic rotation around the axis, and the stationary component 3 remains stationary. A certain gap is maintained between the joint surfaces of the two that have relative motion. The sealing device is installed in the gap between the joint surfaces to prevent the pyrolysis oil and gas in the rotating component 1 and the stationary component 3 from overflowing from the oil and gas side to the atmosphere or leaking into the atmosphere under the negative pressure conditions of the pyrolysis furnace. In addition, the sealing sleeve 2 is made of metal, and its outer circumference is a precision-machined surface with high roundness and surface accuracy. The length of the sealing sleeve 2 should ensure that the packing assembly 6 and the sealing sleeve 2 will not lose contact when the rotating component 1 expands axially due to heat. It is worth noting that the thickness of the sealing sleeve 2 is preferably 1.4 to 2 times the wall thickness of the rotating component 1.

[0043] First, the sealing sleeve 2 is sleeved on the rotating component 1, and the sealing and fixation between the sealing sleeve 2 and the rotating component 1 are completed by welding. Then the sealing housing 4 is sleeved on the sealing kit and sealed with the stationary component 3. After the installation is completed, the stuffing gland 8 on the sealing housing 4 is adjusted. The stuffing gland 8 transmits axial (i.e., the axial direction of the sealing sleeve 2) compression force to the outer stuffing assembly 6, so that the stuffing deforms axially and expands radially (i.e., the radial direction of the sealing sleeve 2) inward and outward, thereby sticking to the sealing sleeve 2 and the inner wall of the sealing housing 4, preventing the sealing medium on the oil and gas side from leaking to the atmosphere side and sealing the sealing housing 4 with the stationary component 3. The air pipe 9 installed on the sealing housing 4 is filled with inert gas such as N2 or Ar to form an intermediate high-pressure area in the annular gas groove 5, realizing "sealing air with air" to further enhance the sealing performance. During the operation of the rotary pyrolysis furnace, the rotating component 1 performs periodic rotational motion around the axis of the cylinder (the rotating component 1 is a horizontal cylinder), and the stationary component 3 remains stationary. The sealing device is installed in the joint surface gap between the rotating component 1 and the stationary component 3 to prevent the pyrolysis oil and gas medium on the oil and gas side from overflowing to the atmosphere side. The sealing device is sealed with the stationary component 3 and does not move with the rotating component 1.

[0044] The sealing device proposed by the present invention adopts the combination of a packing gland 8, a packing assembly 6 and an elastic member 7 to realize contact packing sealing. At the same time, the annular air groove 5 and the air pipe 9 are added by the arrangement of two groups of packing assemblies 6 to realize the support of the air seal, that is, through the close contact between the soft packing and the surface of the sealing sleeve 2 and the sealing shell 4, and supplemented by the back-blowing effect of the pressurized protective gas filled in the annular air groove 5, the pyrolysis oil and gas medium under positive pressure is sealed, and has good sealing performance, which solves the frequent radial runout and axial movement of the rotary pyrolysis furnace during operation and has good follow-up performance. At the same time, a sealing sleeve 2 is added, and the outer circumference of the sleeve is a finely machined surface, which can play a role in contact elimination of the sealing gap between the sealing device and the rotating component 1, facilitates the sliding of the packing assembly 6, improves the adaptability of the sealing device to the axial expansion and movement of the rotating component 1, and has the effect of reducing the wear of the packing assembly 6 and extending the service life.

[0045] As a preferred embodiment, the number of the packing components 6 is at least three groups, the annular air groove 5 is provided between any two groups of packing components 6 , and an elastic member 7 is provided between two adjacent groups of packing components 6 .

[0046] The number of groups of soft packing assemblies 6 installed depends on the sealing requirements. Usually, three groups of packings are installed in each sealing device. The packing assembly 6 is arranged in the annular space formed by the sealing sleeve 2 and the inner wall of the sealing housing 4. Under the action of the packing gland 8, the packing assembly 6 is pressed axially. The axial deformation generated thereby causes the packing assembly 6 to expand radially inward and outward, thereby fitting tightly to the sealing sleeve 2 and the inner wall of the sealing housing 4, preventing the sealing medium on the oil and gas side from leaking outward. This design method can be more flexibly adapted to the sealing requirements of different situations.

[0047] As a preferred embodiment, the packing assembly 6 is composed of packing pieces wound 3 to 5 times in the sealed housing 4, and the packing pieces are woven from a mixture of one or more materials including graphite fiber, ceramic fiber, and metal wire.

[0048] In the above embodiment, the number of turns of each packing element can be determined based on the sealing requirements. Graphite fiber has a much higher tensile strength and elastic modulus than traditional metal materials, a relatively low density of approximately 2.16 g / cm³, and is heat-resistant, maintaining good stability at high temperatures, as well as corrosion and chemical stability. Ceramic fiber is lightweight, heat-resistant, and has a low thermal conductivity: only 0.03 W / (m·K) at room temperature, and 1 / 5 that of clay bricks at 1000°C, exhibiting excellent thermal and chemical stability. Metal wire can also be added to the packing element. It should be noted that to ensure the sealing performance of the device in high-temperature environments of ~600°C, the added metal wire must be lightweight, thermally stable, resilient, low thermal conductivity, and low friction coefficient. The cross-section of the packing element 6 is typically square or circular. This design approach can, to a certain extent, ensure the sealing performance of the packing element in high-temperature environments of ~600°C.

[0049] As a preferred embodiment, the packing gland 8 is connected to the sealing housing 4 with adjustable gaps through a plurality of gland bolts 10 .

[0050] In this design, the gap distance between the packing gland 8 and the sealing housing 4 can be achieved by rotating the gland bolt 10, thereby adjusting the force with which the packing gland 8 presses the packing assembly 6 in the axial direction, thereby adjusting the degree of radial inward and outward expansion of the packing assembly 6, so that the packing assembly 6 can still be tightly attached to the inner wall of the sealing sleeve 2 and the sealing housing 4 under different usage conditions or working life, effectively preventing the sealing medium on the oil and gas side from leaking outward.

[0051] like Figure 1 、 Figure 2 and Figure 4 As shown, as a preferred embodiment, the elastic member 7 includes a pair of first mounting seats 14 and a plurality of first springs 13 arranged opposite to each other, and the two ends of the first spring 13 are respectively arranged in the corresponding mounting grooves 15 on the above-mentioned first mounting seats 14, and the above-mentioned first mounting seats 14 are respectively connected to the packing assemblies 6 on both sides.

[0052] In the above embodiment, the number of first springs 13 is selected according to the radial size of the sealing interface (i.e., the rotating component 1), and the number of mounting grooves 15 on each first mounting seat 14 is set synchronously. Preferably, the number of mounting grooves 15 of a first mounting seat 14 is 12 to 36; this design method can ensure that the packing assembly 6 has a relatively uniform radial stress to a certain extent; in order to ensure that each group of packing assemblies 6 has an optimal radial stress distribution, for a sealing device using three or more groups of packing assemblies 6, the springs corresponding to the elastic members 7 between adjacent packing assemblies 6 can be selected as axial compression springs with different rebound characteristics.

[0053] As a preferred embodiment, the elastic member 7 includes a second spring 16 sleeved on the sealing sleeve 2, and two second mounting seats 17 respectively provided on the two groups of the above-mentioned packing assemblies 6. The second mounting seat 17 is provided with an annular groove 18 coaxial with the second mounting seat 17 on the side close to the second spring 16, and the two ends of the spring are respectively provided in the two annular grooves 18.

[0054] In the above embodiment, as shown in the attached Figure 3 and Figure 5 As shown, for the pyrolysis oil and gas seal of the small-diameter rotating component 1, the second mounting seat 17 in this embodiment can use an annular groove, the installation of the second spring 16 is more convenient, and the force is more uniform and stable; wherein, the second spring 16 can use a conventional coil spring or a wave spring; in order to ensure that each group of packing components 6 has an optimal radial stress distribution, for the sealing device using three or more groups of packing components 6, the springs corresponding to the elastic members 7 between adjacent packing components 6 can use axial compression springs with different rebound characteristics.

[0055] As a preferred embodiment, a throttle tooth 19 is provided on one side of the sealing housing 4 close to the sealing sleeve 2 , and the throttle tooth 19 is closer to the oil and gas side than any packing assembly 6 .

[0056] In the above embodiment, a throttling tooth 19 is provided at the front end of the sealing housing 4 near the oil and gas side. The maze effect produced by the multi-stage cavity structure formed by adjacent tooth gaps can be used to prevent particulate dust in the pyrolysis oil and gas from entering the sealing gap between the sealing sleeve 2 and the packing assembly 6, thereby delaying the wear of the sealing surface.

[0057] As a preferred embodiment, there are multiple air pipes 9, and the sealed shell 4 is evenly spaced along the circumference of the annular air groove 5 to provide multiple air inlet holes 20 connected to the annular air groove 5. The multiple air pipes 9 and the multiple air inlet holes 20 correspond to each other one by one and are connected to each other.

[0058] In the above embodiment, the provision of multiple air inlet holes 20 can ensure the stability of the air pressure in the annular air groove 5 to a certain extent. Preferably, 1-4 air inlet holes 20 can be evenly spaced along the circumference of the annular air groove 5 on the sealing shell 4.

[0059] As a preferred embodiment, the sealing housing 4 and the stationary component 3 are radially sealed and axially sealed respectively by radial O-rings 21 and axial O-rings 22. The sealing housing 4 is radially provided with a connection portion connected to the stationary component 3 by a housing bolt 11. The radial O-ring 21 is provided at the connection portion between the housing bolt 11 and the sealing sleeve 2.

[0060] In the above embodiment, the assembly of the sealing shell 4 and the stationary component 3 is a gap assembly, a radial sealing groove and an axial sealing groove are opened in the sealing shell 4, and a radial O-ring 21 and an axial sealing ring are installed therein to prevent leakage of the pyrolysis oil and gas medium; the design of the shell bolt 11 can facilitate the replacement of the radial O-ring 21 and the axial sealing ring; this design method belongs to the static seal in the sealing device, which can effectively realize the sealing between the sealing shell 4 and the stationary component 3; in order to ensure the stability and oxidation resistance of the radial O-ring 21 and the axial O-ring 22 in a high temperature environment, they can be made of materials such as fluororubber or PTFE.

[0061] As a preferred embodiment, a backing plate 12 is provided between the connecting portion and the stationary component 3 . One side of the backing plate 12 is welded to the stationary component 3 , and the other side is connected to the connecting portion via the housing bolts 11 .

[0062] In the above embodiment, the gasket 12 is welded to the outside of the cover of the stationary component 3, and the sealing shell 4 is fixedly mounted on the gasket 12 by the shell bolts 11. The radial sealing groove and the axial sealing groove are respectively provided on the gasket 12 and the sealing shell 4. The radial O-ring 21 and the axial O-ring 22 are respectively installed in the radial sealing groove and the axial sealing groove to complete the static sealing of the assembly gap between the sealing shell 4 and the stationary component 3. In order to improve the static sealing performance, multiple sealing grooves can also be opened on the sealing shell 4 to install multiple axial O-rings 22. In this design method, the surface roughness requirements for the stationary component 3 are transferred to the gasket 12 through the design of the gasket 12, which makes processing more convenient.

[0063] In summary, the embodiments of the present invention provide a sealing device for a rotary pyrolysis furnace, which adopts a contact filler assembly 6 for sealing and a local high-pressure air cavity, and cooperates with the arrangement of a filler gland 8 and an elastic member 7 to absorb the axial and radial deformation and movement of the furnace body during the heating and cooling process, and can meet the low leakage rate requirement of the rotary pyrolysis furnace for high-temperature pyrolysis oil and gas media under positive pressure, and has an excellent and stable sealing effect.

Claims

1. A sealing device for a rotary pyrolysis furnace, comprising a sealing sleeve (2) fixedly sleeved on a rotating component (1) and a sealing housing (4) sealedly connected to a stationary component (3), wherein the sealing housing (4) is sleeved on the sealing sleeve (2) with a gap, and characterized in that: The sealing housing (4) is provided with an annular air groove (5) near the sealing sleeve (2); two groups of packing assemblies (6) are provided on both sides of the annular air groove (5) between the sealing housing (4) and the sealing sleeve (2) and can cooperate to seal the annular air groove (5); an elastic member (7) arranged along the axial direction of the rotating component (1) is provided between the two groups of packing assemblies (6); a packing gland (8) is provided on the sealing housing (4) away from the oil and gas side to encapsulate the packing assembly (6) in the sealing housing; and an air pipe (9) is also connected to the sealing housing (4) and communicates with the annular air groove (5).

2. A sealing device for a rotary pyrolysis furnace according to claim 1, characterized in that: The number of the packing components (6) is at least three groups, the annular air groove (5) is provided between any two groups of packing components (6), and elastic members (7) are provided between two adjacent groups of packing components (6).

3. The sealing device for a rotary pyrolysis furnace according to claim 2, characterized in that: The packing assembly (6) is composed of packing pieces wound in 3 to 5 turns in the sealed housing (4), and the packing pieces are made of a mixture of one or more materials including graphite fiber, ceramic fiber and metal wire.

4. The sealing device for a rotary pyrolysis furnace according to claim 3, characterized in that: The packing gland (8) is connected to the sealing housing (4) with adjustable clearance via a plurality of gland bolts (10).

5. The sealing device for a rotary pyrolysis furnace according to claim 4, characterized in that: The elastic member (7) comprises a pair of first mounting seats (14) and a plurality of first springs (13) arranged opposite to each other, the two ends of the first springs (13) being respectively arranged in corresponding mounting grooves (15) on the first mounting seats (14), and the first mounting seats (14) being respectively connected to the packing assemblies (6) on both sides.

6. The sealing device for a rotary pyrolysis furnace according to claim 4, characterized in that: The elastic member (7) comprises a second spring (16) sleeved on the sealing sleeve (2), and two second mounting seats (17) respectively arranged on the two groups of the packing assemblies (6); a circular annular groove (18) coaxial with the second mounting seat (17) is provided on one side of the second mounting seat (17) close to the second spring (16); and two ends of the second spring (16) are respectively arranged in the two circular annular grooves (18).

7. The sealing device for a rotary pyrolysis furnace according to claim 1, characterized in that: A throttling tooth (19) is provided on one side of the sealing housing (4) close to the sealing sleeve (2), and the throttling tooth (19) is closer to the oil and gas side than any packing component (6).

8. The sealing device for a rotary pyrolysis furnace according to claim 1, characterized in that: The number of the air pipes (9) is multiple, and the sealed housing (4) is evenly spaced along the circumference of the annular air groove (5) to provide multiple air inlet holes (20) that are all connected to the annular air groove (5). The multiple air pipes (9) and the multiple air inlet holes (20) correspond to each other one by one and are connected to each other.

9. The sealing device for a rotary pyrolysis furnace according to claim 1, characterized in that: The sealing housing (4) and the stationary component (3) are radially sealed and axially sealed respectively by means of a radial O-ring (21) and an axial O-ring (22). The sealing housing (4) is radially provided with a connection portion connected to the stationary component (3) by means of a housing bolt (11). The radial O-ring (21) is provided at the connection portion between the housing bolt (11) and the sealing sleeve (2).

10. The sealing device for a rotary pyrolysis furnace according to claim 9, characterized in that: A backing plate (12) is provided between the connecting portion and the stationary component (3); one side of the backing plate (12) is welded to the stationary component (3), and the other side is connected to the connecting portion via the housing bolts (11).

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