A pyrolysis rotary kiln and a pyrolysis rotary kiln system

Abstract

The present application provides a pyrolysis rotary kiln and a pyrolysis rotary kiln system, which relates to the technical field of rotary kilns. The pyrolysis rotary kiln includes a rotary kiln body, a conical section housing, and a straight section housing of the reduced-diameter discharge port that are sequentially connected along the discharge direction; the inner diameter of the conical section housing gradually decreases from the end close to the rotary kiln body to the end close to the straight section housing of the reduced-diameter discharge port. This design greatly reduces the volume of the discharge sealing cover and the processing difficulty of the kiln tail seal, and greatly reduces the operating cost.

Description

Technical Field

[0001] The present invention relates to the technical field of rotary kilns, and more specifically, to a pyrolysis rotary kiln and a pyrolysis rotary kiln system. Background Art

[0002] A rotary kiln generally refers to a rotary calcination kiln, which belongs to the category of building materials equipment. Rotary kilns can be divided into cement kilns, metallurgical and chemical kilns, and lime kilns according to the materials processed. Cement kilns are mainly used for calcining cement clinker, and are divided into two major categories: dry-process cement kilns and wet-process cement kilns. Metallurgical and chemical kilns are mainly used in the metallurgical industry for magnetization roasting of lean iron ore in steel mills; oxidation roasting of chromium and nickel iron ore; roasting of high-aluminum bauxite in refractory material factories and roasting of clinker and aluminum hydroxide in aluminum factories, etc. None of the above rotary kilns involve the generation of a large amount of substances similar to gas in the kiln, will not have problems of poor sealing and releasing a large amount of useful or harmful gases to the outside, nor will there be problems of fire or explosion hazards.

[0003] However, the probability of the above problems occurring in the pyrolysis rotary kiln of coal is quite high, especially at the high-temperature part of the kiln tail. Poor sealing will cause serious consequences. Summary of the Invention

[0004] The present application provides a pyrolysis rotary kiln and a pyrolysis rotary kiln system to solve the above technical problems.

[0005] The present application can be implemented as follows:

[0006] The present application provides a pyrolysis rotary kiln, which includes a rotary kiln body, a conical section housing, and a straight section housing of the reduced-diameter discharge port that are sequentially connected along the discharge direction.

[0007] Wherein, the inner diameter of the conical section housing gradually decreases from the end close to the rotary kiln body to the end close to the straight section housing of the reduced-diameter discharge port.

[0008] In an alternative embodiment, a multi-head spiral pusher plate is arranged on the inner side of the conical section housing. The multi-head spiral pusher plate is used to push the materials in the rotary kiln body through the straight section housing of the reduced-diameter discharge port when the multi-head spiral pusher plate rotates with the rotary kiln body, so as to balance the materials in the straight section housing of the reduced-diameter discharge port and the materials in the rotary kiln body.

[0009] In an alternative embodiment, the outer diameter of the straight section housing of the reduced-diameter discharge port is 0.4 - 0.7 times the outer diameter of the rotary kiln body.

[0010] In an alternative embodiment, at least one of the inner sides of the rotary kiln body, the conical section housing, and the straight section housing of the reduced-diameter discharge port is provided with a first heat insulation and heat preservation layer.

[0011] In an alternative embodiment, a second heat insulation and heat preservation layer is provided on the end face of the outer side of the straight section housing of the reduced-diameter discharge port close to the discharge port.

[0012] In an alternative embodiment, along the discharging direction, the length of the second heat insulation layer is 1 / 2 - 2 / 3 of the length of the straight section shell of the discharging port after necking down.

[0013] In an alternative embodiment, an outer heat insulation shell is arranged on the outer side of the second heat insulation layer.

[0014] In an alternative embodiment, a spiral is arranged on the outer side of the outer heat insulation shell. When rotating along with the rotary kiln body, the spiral causes the dust outside the spiral to be discharged towards the discharging port.

[0015] In an alternative embodiment, the spiral is fixedly welded to the outer heat insulation shell.

[0016] In an alternative embodiment, the spiral is formed by coiling round steel or square steel.

[0017] In an alternative embodiment, the pyrolysis rotary kiln further includes a heat insulation friction ring, which is arranged adjacent to one end of the second heat insulation layer away from the discharging port;

[0018] In an alternative embodiment, the heat insulation friction ring includes an inner ring, an outer ring, a first vertical ring and a second vertical ring; the inner ring and the outer ring are sleeved on the outer side of the straight section shell of the discharging port after necking down at intervals from inside to outside; both the first vertical ring and the second vertical ring are arranged between the inner ring and the outer ring, and the first vertical ring and the second vertical ring are vertically spaced; a heat dissipation chamber for communicating with the atmosphere is formed between the inner ring, the outer ring, the first vertical ring and the second vertical ring.

[0019] In an alternative embodiment, the second vertical ring is located on the side of the first vertical ring away from the discharging port; the second vertical ring is provided with through holes for communicating with the heat dissipation chamber.

[0020] In an alternative embodiment, the number of the through holes is multiple, and the multiple through holes are distributed at the middle position of the second vertical ring.

[0021] In an alternative embodiment, the first vertical ring is welded and sealed to both the inner ring and the outer ring.

[0022] In an alternative embodiment, the second vertical ring is welded and sealed to both the inner ring and the outer ring.

[0023] In an alternative embodiment, the roughness of the outer surface of the heat insulation friction ring ≤ 0.8 microns.

[0024] In an alternative embodiment, the inner diameter of the inner ring is larger than the outer diameter of the straight section shell of the discharging port after necking down.

[0025] In an alternative embodiment, the difference between the inner diameter of the inner ring and the outer diameter of the straight section shell of the discharging port after necking down ≥ 10 mm.

[0026] In an alternative embodiment, the second heat insulation layer is welded and sealed to the side surface of the heat insulation friction ring.

[0027] In an alternative embodiment, the pyrolysis rotary kiln further includes a wedge iron, which is located between the inner ring and the straight section shell of the reduced-diameter discharge port.

[0028] In an alternative embodiment, wedge irons are respectively arranged at the ends of the inner ring close to and far from the discharge port.

[0029] In an alternative embodiment, the wedge iron has an inner arc and an outer arc along the direction perpendicular to the axis of the straight section shell of the reduced-diameter discharge port.

[0030] In an alternative embodiment, both the inner arc and the outer arc of the wedge iron are circular arcs.

[0031] In an alternative embodiment, the inner arc of the wedge iron is equal to the outer diameter of the discharge port.

[0032] In an alternative embodiment, the outer diameter of the thin end of the outer arc of the wedge iron is smaller than the inner diameter of the inner ring, and the outer diameter of the thick end of the outer arc of the wedge iron is larger than the inner diameter of the inner ring.

[0033] In an alternative embodiment, the wedge iron is fixed to the straight section shell of the reduced-diameter discharge port by spot welding, and the wedge iron is fixed to the inner ring by spot welding.

[0034] In an alternative embodiment, the pyrolysis rotary kiln further includes a kiln tail hood and an elastic sealing mechanism. The kiln tail hood is arranged at the discharge port, and the elastic sealing mechanism is arranged between the kiln tail hood and the outer side of the outer ring heat insulation friction ring.

[0035] In an alternative embodiment, the pyrolysis rotary kiln further includes air guide vanes, which are arranged on the side of the second vertical ring far from the discharge port. The air guide vanes are arranged at intervals corresponding to the through holes, and the air guide vanes are arranged at an angle with the rotation axis of the rotary kiln body, so that when the air guide vanes rotate with the rotary kiln body, the gas in the atmosphere is guided into the heat dissipation chamber through the through holes.

[0036] In an alternative embodiment, the number of the air guide vanes is multiple.

[0037] In an alternative embodiment, the multiple air guide vanes are evenly distributed.

[0038] In an alternative embodiment, one end edge of the air guide vane is welded to the inner ring, the outer ring and the second vertical ring at the same time.

[0039] The present application also provides a pyrolysis rotary kiln system, which includes the above-mentioned pyrolysis rotary kiln.

[0040] The beneficial effects of the pyrolysis rotary kiln and the pyrolysis rotary kiln system of the present application include:

[0041] The pyrolysis rotary kiln adopts the method of unequal diameters, making the inner diameter of the straight section shell of the discharge port smaller than that of the rotary kiln body after necking down. In this way, the outer diameter of the discharge port can be relatively reduced, making it easier to better seal the sealing surface of the discharge port. At the same time, a smaller kiln tail hood can be installed at the discharge port for discharging materials, greatly reducing the operating cost. Moreover, the inner diameter of the conical section shell gradually decreases, which can make the conveying of materials relatively stable and ensure the operating stability. The pyrolysis rotary kiln system including the above pyrolysis rotary kiln also has the above technical effects. Brief Description of the Drawings

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0043] Figure 1 It is a schematic structural diagram of some positions of the pyrolysis rotary kiln provided in this embodiment;

[0044] Figure 2 For Figure 1 The partial enlarged view at A in.

[0045] Reference Signs: 100 - Pyrolysis Rotary Kiln; 1 - Rotary Kiln Body; 2 - Conical Section Shell; 3 - Straight Section Shell of the Discharge Port after Necking Down; 31 - Discharge Port; 4 - Multi - head Spiral Pusher Plate; 5 - First Heat Insulation Layer; 61 - Second Heat Insulation Layer; 62 - Outer Heat Insulation Shell; 63 - Helix; 7 - Heat Insulation Friction Ring; 71 - Inner Ring; 72 - Outer Ring; 73 - First Vertical Ring; 74 - Second Vertical Ring; 75 - Through Hole; 76 - Heat Dissipation Chamber; 77 - Air Deflector Vane; 8 - Wedge Iron; 81 - Inner Arc of Wedge Iron; 82 - Outer Arc of Wedge Iron; 9 - Kiln Tail Hood; 10 - Elastic Sealing Mechanism. Detailed Embodiments

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0047] Accordingly, 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 claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0048] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not require further definition and explanation in subsequent drawings.

[0049] In the description of the present invention, it should be noted that if terms such as "inner" and "outer" are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0050] In addition, if terms such as "first" and "second" are used only for distinguishing descriptions, they should not be construed as indicating or implying relative importance.

[0051] It should be noted that the features in the embodiments of the present invention can be combined with each other without conflict.

[0052] In a traditional rotary kiln, its diameter is generally consistent from head to tail. Such a design often makes it difficult to achieve good sealing at the high-temperature part of the kiln tail, and poor sealing will cause serious consequences.

[0053] Please refer to Figure 1 together with Figure 2 , the present application provides a pyrolysis rotary kiln 100, which can effectively solve this technical problem. The pyrolysis rotary kiln 100 includes a rotary kiln body 1, a conical section housing 2, and a straight section housing 3 of the reduced-diameter discharge port that are connected in sequence along the discharge direction (from left to right).

[0054] Wherein, one end of the straight section housing 3 of the reduced-diameter discharge port away from the conical section housing 2 corresponds to the discharge port 31. The inner diameter of the conical section housing 2 gradually decreases from the end close to the rotary kiln body 1 to the end close to the straight section housing 3 of the reduced-diameter discharge port, that is, the inner diameter of the straight section housing 3 of the reduced-diameter discharge port is smaller than the inner diameter of the rotary kiln body 1.

[0055] For reference, the outer contour of the rotary kiln body 1 is cylindrical, the outer contour of the conical section housing 2 is frustum-shaped, and the outer contour of the straight section housing 3 of the reduced-diameter discharge port is cylindrical. Figure 1The arrow direction indicated by m can be understood as the length direction of the pyrolysis rotary kiln 100, or the rotational axis direction of the rotary kiln body 1, or the axis direction of the cylindrical or frustum-shaped structure mentioned above.

[0056] The pyrolysis rotary kiln 100 adopts a non-uniform diameter method, making the inner diameter of the straight section shell 3 of the discharge port after necking down smaller than the inner diameter of the rotary kiln body 1. This can relatively reduce the outer diameter of the discharge port 31, making it easier to better seal the sealing surface of the discharge port 31. Moreover, the setting of the necking-down form allows a smaller kiln tail hood 9 to be installed at the discharge port 31 for discharging materials, greatly reducing the operating cost. In addition, the inner diameter of the conical section shell 2 gradually decreases, which can make the material transportation relatively stable and ensure stable operation.

[0057] In this embodiment, a multi-head spiral pusher plate 4 is arranged inside the conical section shell 2. The multi-head spiral pusher plate 4 can rotate with the rotation of the rotary kiln body 1. The multi-head spiral pusher plate 4 is used to push the materials in the rotary kiln body 1 to quickly pass through the straight section shell 3 of the discharge port after necking down when rotating, so as to balance the materials in the straight section shell 3 of the discharge port after necking down and the materials in the rotary kiln body 1.

[0058] Optionally, the outer diameter of the straight section shell 3 of the discharge port after necking down can be 0.4 - 0.7 times the outer diameter of the rotary kiln body 1, such as 0.4 times, 0.5 times, 0.6 times or 0.7 times, etc. The above ratio is designed according to the amount of incoming and outgoing materials, which can make the outer diameter of the discharge port 31 match the actual requirements, and has a positive effect on the subsequent design of the kiln tail hood 9 and its matching rotary seal in terms of processing difficulty, operating cost, reliability, etc.

[0059] For reference, the outer diameter of the rotary kiln body 1 can be 4.2 meters, and the outer diameter of the straight section shell 3 of the discharge port after necking down is 2.8 meters. In this case, the outer diameter of the straight section shell 3 of the discharge port after necking down is 0.67 times the outer diameter of the rotary kiln body 1.

[0060] In addition, the outer diameter of the rotary kiln body 1 can also be 6.2 meters, and the outer diameter of the straight section shell 3 of the discharge port after necking down is 2.85 meters. In this case, the outer diameter of the straight section shell 3 of the discharge port after necking down is 0.46 times the outer diameter of the rotary kiln body 1.

[0061] Furthermore, the outer diameter of the rotary kiln body 1 can also be 7.2 meters, and the outer diameter of the straight section shell 3 of the discharge port after necking down is 4.5 meters. In this case, the outer diameter of the straight section shell 3 of the discharge port after necking down is 0.635 times the outer diameter of the rotary kiln body 1.

[0062] In this embodiment, a first heat insulation and heat preservation layer 5 is provided on the inner side of at least one of the rotary kiln body 1, the conical section shell 2, and the straight section shell 3 of the discharge port after necking down.

[0063] Preferably, a first heat insulation layer 5 is provided on the inner sides of the rotary kiln body 1, the conical section housing 2, and the straight section housing 3 of the reduced neck discharge port, so as to improve the heat insulation effect inside the corresponding structures and prevent the temperature of the external area from being too high and affecting the seal at the kiln tail hood 9.

[0064] In this embodiment, a second heat insulation layer 61 is provided on the end face of the outer side of the straight section housing 3 of the reduced neck discharge port close to the discharge port 31. This setting can further improve the heat insulation effect at the corresponding position and prevent the temperature of the external area from being too high and affecting the seal at the kiln tail hood 9.

[0065] Optionally, along the discharge direction, the length of the second heat insulation layer 61 can be 1 / 2 - 2 / 3 of the length of the straight section housing 3 of the reduced neck discharge port, such as 1 / 2 or 2 / 3, etc.

[0066] Furthermore, an outer layer heat insulation housing 62 is provided on the outer side of the second heat insulation layer 61.

[0067] Furthermore, a spiral 63 is provided on the outer side of the outer layer heat insulation housing 62. The spiral 63 is used to discharge the dust outside the spiral 63 towards the discharge port 31 when rotating with the rotary kiln body 1.

[0068] Optionally, the spiral 63 is fixedly welded to the outer layer heat insulation housing 62.

[0069] Optionally, the spiral 63 is formed by coiling round steel or square steel.

[0070] In this embodiment, the pyrolysis rotary kiln 100 further includes a heat insulation friction ring 7. The heat insulation friction ring 7 is disposed adjacent to one end of the second heat insulation layer 61 away from the discharge port 31, and the heat insulation friction ring 7 rotates with the rotary kiln body 1.

[0071] Optionally, the heat insulation friction ring 7 includes an inner ring 71, an outer ring 72, a first vertical ring 73, and a second vertical ring 74. The inner ring 71 and the outer ring 72 are sleeved on the outer side of the straight section housing 3 of the reduced neck discharge port at intervals from the inside to the outside. Both the first vertical ring 73 and the second vertical ring 74 are disposed between the inner ring 71 and the outer ring 72 and the inner ring 71 and the outer ring 72 are vertically spaced. A heat dissipation chamber 76 for communicating with the atmosphere is formed between the inner ring 71, the outer ring 72, the first vertical ring 73, and the second vertical ring 74.

[0072] Referentially, the second vertical ring 74 is located on the side of the first vertical ring 73 away from the discharge port 31. The second vertical ring 74 is provided with through holes 75 for communicating with the heat dissipation chamber 76.

[0073] The number of the above through holes 75 is preferably multiple. The multiple through holes are preferably distributed at the middle position of the second vertical ring 74.

[0074] For reference, the first vertical ring 73 is welded and sealed to both the inner ring 71 and the outer ring 72. Similarly, the second vertical ring 74 is also welded and sealed to both the inner ring 71 and the outer ring 72.

[0075] Preferably, the inner diameter of the inner ring 71 is greater than the outer diameter of the straight section of the reduced-diameter discharge port housing 3. For reference, the difference between the inner diameter of the inner ring 71 and the outer diameter of the straight section of the reduced-diameter discharge port housing 3 is ≥ 10 mm, such as 10 mm, 16 mm, 20 mm, 25 mm, 30 mm or 40 mm, etc.

[0076] In this application, the second heat insulation layer 61 and the side surface of the heat insulation friction ring 7 can be optionally welded and sealed so that a strict seal can be obtained between the heat insulation friction ring 7 and the straight section of the reduced-diameter discharge port housing 3.

[0077] In this embodiment, the outer surface of the heat insulation friction ring 7 is preferably precision machined so that its roughness ≤ 0.8 microns, such as 0.8 microns, 0.7 microns or 0.6 microns, etc. This design can greatly reduce the processing difficulty of the seal.

[0078] Furthermore, the pyrolysis rotary kiln 100 further includes a wedge iron 8, and the wedge iron 8 is located between the inner ring 71 and the straight section of the reduced-diameter discharge port housing 3.

[0079] For reference, wedge irons 8 are respectively provided at both ends of the inner ring 71 close to and away from the discharge port 31.

[0080] The above-mentioned wedge iron 8 has a wedge iron inner arc 81 and a wedge iron outer arc 82 along the direction perpendicular to the axis of the straight section of the reduced-diameter discharge port housing 3. Both the above-mentioned wedge iron inner arc 81 and the wedge iron outer arc 82 can be circular arcs. The wedge iron inner arc 81 is equal to the outer diameter of the discharge port 31. The wedge iron inner arc 81 is arranged in contact with the outer wall of the straight section of the reduced-diameter discharge port housing 3.

[0081] Preferably, the outer diameter of the thin end of the wedge iron outer arc 82 (i.e., the end with a thinner thickness of the wedge iron outer arc 82) is smaller than the inner diameter of the inner ring 71, and the outer diameter of the thick end of the wedge iron outer arc 82 (i.e., the end with a thicker thickness of the wedge iron outer arc 82) is greater than the inner diameter of the inner ring 71. The wedge iron outer arc 82 is inclined from the thin end to the thick end or from the thick end to the thin end. Different positions of the wedge iron outer arc 82 are used to fix to the inner ring 71 so that the outer surface of the heat insulation friction ring 7 is straight and has little runout when rotating with the rotary kiln body 1.

[0082] The wedge iron 8 and the straight section of the reduced-diameter discharge port housing 3 can be fixed by spot welding, and the wedge iron 8 and the inner ring 71 can also be fixed by spot welding. By adjusting the position of the wedge iron 8, the outer surface of the heat insulation friction ring 7 can be made as straight as possible and have little runout during rotation. By spot welding the wedge iron 8, the wedge iron 8 and the heat insulation friction ring 7 can be effectively fixed. When the rotary kiln body 1 rotates with large runout, the above design is beneficial to make the outer surface of the heat insulation friction ring 7 have less runout and better straightness.

[0083] Furthermore, the pyrolysis rotary kiln 100 of this embodiment further includes a kiln tail hood 9 and an elastic sealing mechanism 10. The kiln tail hood 9 is installed at the discharge port 31, and the elastic sealing mechanism 10 is arranged between the outside of the kiln tail hood 9 and the outer ring 72.

[0084] The elastic rubber part of the above elastic sealing mechanism 10 is sealingly attached to the outside of the heat insulation friction ring 7, that is, on the outer surface of the outer ring 72, and a better sealing effect can be achieved.

[0085] In this embodiment, the pyrolysis rotary kiln 100 further includes air guide vanes 77. The air guide vanes 77 are arranged on the side of the second vertical ring 74 away from the discharge port 31. The air guide vanes 77 are arranged at intervals corresponding to the through holes 75. The air guide vanes 77 are arranged at an angle with the rotation axis line of the rotary kiln body 1, so that when the air guide vanes 77 rotate with the rotary kiln body 1, the gas in the atmosphere can be guided into the heat dissipation chamber 76 through the through holes 75. In this way, the outer surface temperature of the heat insulation friction ring 7 can be reduced by cold air, providing a relatively low and good environment for the elastic rubber part, and making the seal effective for a long time.

[0086] For reference, the number of the air guide vanes 77 can be multiple, and the multiple air guide vanes 77 are evenly distributed. Specifically, the number of the through holes 75 between the above intervals can be 1-3, for example, 1, 2 or 3.

[0087] One end edge of the air guide vane 77 is welded to the inner ring 71, the outer ring 72 and the second vertical ring 74 at the same time.

[0088] In addition, the embodiment of the present application further provides a pyrolysis rotary kiln system, which includes the above pyrolysis rotary kiln 100. The pyrolysis rotary kiln system may further include a control device. For example, it may include a driving motor, a controller, etc. The driving motor drives the rotary kiln body 1 to rotate, and the controller controls the output speed of the driving motor.

[0089] The working principle of the pyrolysis rotary kiln 100 provided in this embodiment is as follows:

[0090] When the rotary kiln body 1 rotates, it drives the materials inside it to be conveyed towards the discharge port 31. Under the action of the multi-head spiral pusher plate 4 in the rotary kiln body 1, the materials can quickly pass through the straight section shell 3 of the reduced neck discharge port, so that the materials in the straight section shell 3 of the reduced neck discharge port and the materials in the rotary kiln body 1 reach balance. Finally, the materials are discharged after passing through the kiln tail hood 9 installed at the discharge port 31.

[0091] When the rotary kiln body 1 rotates, it also drives the heat insulation friction ring 7 to rotate. Under the action of the air guide vanes 77, the air in the atmosphere enters the heat dissipation chamber 76 in the heat insulation friction ring 7 through the through holes 75 on the second vertical ring 74 to reduce the temperature at this place.

[0092] When the rotary kiln body 1 rotates, the elastic sealing mechanism 10 is relatively fixed with the kiln tail hood 9 and neither of them rotates. The elastic seal of the elastic sealing mechanism 10 is always in sealed contact with the heat insulation friction ring 7 installed outside the straight section shell 3 of the discharge port after necking down, so as to achieve the sealing effect. Since the temperature here is relatively low and the entire pyrolysis rotary kiln 100 adopts the necking-down treatment, the outer diameter dimension of the discharge port 31 is relatively small, so that this seal is more effective and can maintain a better sealing effect for a long time.

[0093] In summary, the pyrolysis rotary kiln provided by the present application adopts the unequal diameter method, so that the inner diameter of the straight section shell of the discharge port after necking down is smaller than the inner diameter of the rotary kiln body, which can relatively reduce the outer diameter of the discharge port, making it easier to better seal the sealing surface of the discharge port. At the same time, a smaller kiln tail hood can be installed at the discharge port for discharging materials, greatly reducing the operation cost. Moreover, the inner diameter of the conical section shell gradually becomes smaller, which can make the conveying of materials relatively stable and ensure the operation stability. The pyrolysis rotary kiln system including the above pyrolysis rotary kiln also has the above technical effects.

[0094] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A pyrolysis rotary kiln, characterized in that, It includes a rotary kiln body, a conical section housing, and a straight section housing of the reduced-diameter discharge port that are connected in sequence along the discharge direction; The inner diameter of the conical section housing gradually decreases from the end close to the rotary kiln body to the end close to the straight section housing of the reduced-diameter discharge port; A second heat insulation and thermal insulation layer is provided on the end face of the outer side of the straight section housing of the reduced-diameter discharge port close to the discharge port; The pyrolysis rotary kiln further includes a heat insulation friction ring, and the heat insulation friction ring is arranged adjacent to the end of the second heat insulation and thermal insulation layer away from the discharge port; the heat insulation friction ring includes an inner ring, an outer ring, a first vertical ring, and a second vertical ring; the inner ring and the outer ring are sleeved on the outer side of the straight section housing of the reduced-diameter discharge port at intervals from the inside to the outside; the first vertical ring and the second vertical ring are both arranged between the inner ring and the outer ring and the first vertical ring and the second vertical ring are vertically spaced; a heat dissipation chamber for communicating with the atmosphere is formed between the inner ring, the outer ring, the first vertical ring, and the second vertical ring; the second vertical ring is located on the side of the first vertical ring away from the discharge port; the second vertical ring is provided with through holes to communicate with the heat dissipation chamber; The pyrolysis rotary kiln further includes air guiding vanes, the air guiding vanes are arranged on the side of the second vertical ring away from the discharge port, the air guiding vanes are correspondingly spaced from the through holes, and the air guiding vanes are arranged at an angle with the rotation axis line of the rotary kiln body, so that when the air guiding vanes rotate with the rotary kiln body, the gas in the atmosphere is guided into the heat dissipation chamber through the through holes; An outer thermal insulation housing is provided on the outer side of the second heat insulation and thermal insulation layer; a spiral is provided on the outer side of the outer thermal insulation housing, and the spiral is used to discharge the dust outside the spiral to the discharge port when rotating with the rotary kiln body; The pyrolysis rotary kiln further includes a wedge iron, and the wedge iron is located between the inner ring and the straight section housing of the reduced-diameter discharge port.

2. The pyrolysis rotary kiln according to claim 1, characterized in that, A multi-head spiral pushing plate is provided on the inner side of the conical section housing, and the multi-head spiral pushing plate is used to push the materials in the rotary kiln body through the straight section housing of the reduced-diameter discharge port when the multi-head spiral pushing plate rotates with the rotary kiln body, so that the materials in the straight section housing of the reduced-diameter discharge port and the materials in the rotary kiln body reach balance.

3. The pyrolysis rotary kiln according to claim 1, characterized in that, The outer diameter of the straight section housing of the reduced-diameter discharge port is 0.4-0.7 times the outer diameter of the rotary kiln body.

4. The pyrolysis rotary kiln according to claim 1, characterized in that, A first heat insulation and thermal insulation layer is provided on the inner side of at least one of the rotary kiln body, the conical section housing, and the straight section housing of the reduced-diameter discharge port.

5. The pyrolysis rotary kiln according to claim 1, characterized in that, Along the discharge direction, the length of the second heat insulation and thermal insulation layer is 1 / 2-2 / 3 of the length of the straight section housing of the reduced-diameter discharge port.

6. The pyrolysis rotary kiln according to claim 1, characterized in that, The spiral is fixedly welded to the outer thermal insulation housing.

7. The pyrolysis rotary kiln according to claim 6, characterized in that, The spiral is formed by coiling round steel or square steel.

8. The pyrolysis rotary kiln according to claim 1, characterized in that, The number of the through holes is multiple, and the multiple through holes are distributed at the middle position of the second vertical ring.

9. The pyrolysis rotary kiln according to claim 1, characterized in that, The first vertical ring is welded and sealed to both the inner ring and the outer ring.

10. The pyrolysis rotary kiln according to claim 1, characterized in that, The second vertical ring is welded and sealed to both the inner ring and the outer ring.

11. The pyrolysis rotary kiln according to claim 1, characterized in that, The surface roughness of the outer surface of the heat insulation friction ring ≤ 0.8 microns.

12. The pyrolysis rotary kiln according to claim 1, characterized in that, The inner diameter of the inner ring is larger than the outer diameter of the straight-section shell of the reduced-diameter discharge port.

13. The pyrolysis rotary kiln according to claim 1, characterized in that, The difference between the inner diameter of the inner ring and the outer diameter of the straight-section shell of the reduced-diameter discharge port is ≥ 10 mm.

14. The pyrolysis rotary kiln according to claim 1, characterized in that, The second heat-insulating and heat-preserving layer is welded and sealed to the side surface of the heat-insulating friction ring.

15. The pyrolysis rotary kiln according to claim 1, characterized in that, Wedges are respectively arranged at the ends of the inner ring close to and far from the discharge port.

16. The pyrolysis rotary kiln according to claim 15, characterized in that, The wedge has an inner arc and an outer arc in the direction perpendicular to the axis of the straight-section shell of the reduced-diameter discharge port.

17. The pyrolysis rotary kiln according to claim 16, characterized in that, Both the inner arc and the outer arc of the wedge are circular arcs.

18. The pyrolysis rotary kiln according to claim 17, wherein The inner arc of the wedge is equal to the outer diameter of the discharge port.

19. The pyrolysis rotary kiln according to claim 17, wherein The outer diameter of the thinner end of the outer arc of the wedge is smaller than the inner diameter of the inner ring, and the outer diameter of the thicker end of the outer arc of the wedge is larger than the inner diameter of the inner ring.

20. The pyrolysis rotary kiln according to claim 1, wherein The wedge is fixed to the straight-section shell of the reduced-diameter discharge port by spot welding, and the wedge is fixed to the inner ring by spot welding.

21. The pyrolysis rotary kiln according to claim 1, wherein The pyrolysis rotary kiln further includes a kiln tail hood and an elastic sealing mechanism; The kiln tail hood is arranged at the discharge port, and the elastic sealing mechanism is arranged between the kiln tail hood and the outer side of the outer ring.

22. The pyrolysis rotary kiln according to claim 1, wherein The number of the air guide vanes is multiple.

23. The pyrolysis rotary kiln according to claim 22, wherein The multiple air guide vanes are evenly distributed.

24. The pyrolysis rotary kiln according to claim 1, wherein One edge of one end of the air guide vane is simultaneously welded to the inner ring, the outer ring and the second vertical ring.

25. A pyrolysis rotary kiln system, wherein It includes the pyrolysis rotary kiln according to any one of claims 1-24.

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