Discharging cover structure of rotary kiln
By setting a dynamic sealing structure at the discharge end of the rotary kiln, an efficient sealing is achieved using the dynamic sealing mechanism between the tilt part and the discharge cover, solving the problems of lax sealing and complex structure in the prior art, and improving the sealing effect and practicality.
Patent Information
- Application Number
- CN202510284358.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-11
- Publication Date
- 2025-05-02
AI Technical Summary
The existing rotary kiln sealing technology cannot effectively control the jumping of the ends of the rotary kiln, and it has a complex structure, large investment and poor practicality, and cannot meet the strict sealing requirements of chemical rotary kilns such as low-order coal pyrolysis.
Using a dynamic sealing structure, a dynamic sealing mechanism is set at the cut end of the rotary kiln and a dynamic sealing mechanism between the cut-out end and the cut-out cover, including a fixing cylinder, a fixing ring and a flexible sealing material, and the position of the movable ring is dynamically adjusted by adjusting the top wire to ensure that the flexible sealing material always fills the sealing area.
It realizes efficient sealing of the rotary kiln, avoids leakage of pyrolysis products and air inflow, ensures environmental protection and safety, while reducing structural complexity and investment costs, and improving operating cycle and practicality.
Smart Images
Figure CN119915087A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a rotary kiln material lowering cover structure, belonging to the technical field of rotary kilns. Background Art
[0002] The most widely used seals for rotary kilns are fish scale seals and labyrinth seals, which are completely suitable for cement kilns, lime kilns and other uses that do not require strict sealing. However, for low-rank coal pyrolysis in rotary kilns, on the one hand, the pyrolysis products cannot leak out, otherwise it will cause environmental pollution, and on the other hand, air cannot enter, otherwise it will cause safety problems such as explosions. Therefore, the above sealing technology can no longer meet the sealing requirements of chemical rotary kilns such as low-rank coal pyrolysis. Therefore, it is necessary to develop new sealing technologies to meet the stringent sealing requirements.
[0003] The invention patent with publication number 111141143A discloses a dynamic sealing structure and a rotary kiln, which cannot effectively control and meet the vibration of the end of the rotary kiln, and the patent has a complex structure, large investment and poor practicality. Therefore, it is urgent to develop a simple and practical rotary kiln sealing technology. Summary of the invention
[0004] In order to solve the technical problems existing in the prior art, the present invention provides a rotary kiln lower material cover structure, which adopts a dynamic sealing structure, has good overall sealing effect, simple structure, long operation cycle, and is widely applicable to rotary kilns for chemical industries such as coal, oil shale, and biomass pyrolysis.
[0005] To achieve the above object, the technical solution adopted by the present invention is a rotary kiln material discharge cover structure, comprising a rotary kiln and a material discharge cover installed on the rotary kiln, wherein the material discharge end of the rotary kiln is provided with an outward turning portion, the material discharge cover is sleeved on the outward turning portion, and a dynamic sealing mechanism is provided between the outward turning portion and the material discharge cover; The rotary kiln, the material discharging cover and the outer turning part are all provided with heat-insulating materials.
[0006] Preferably, a heat dissipation gap is provided between the outward turning portion and the outer wall of the rotary kiln.
[0007] Preferably, the dynamic sealing mechanism includes a fixed cylinder which is sleeved on the outside of the outward-turned part and fixed on the lower material cover, and a first fixed ring and a second fixed ring which are installed on the inner wall of the fixed cylinder and sleeved on the outside of the outward-turned part, a gap is left between the first fixed ring, the second fixed ring and the outward-turned part, and a flexible sealing material is filled between the first fixed ring and the second fixed ring.
[0008] Preferably, a movable ring is installed on the inner side of the first fixed ring through at least two adjusting top screws, the adjusting top screws are installed on the first fixed ring, and the flexible sealing material is arranged between the movable ring and the second fixed ring.
[0009] Preferably, the flexible sealing material is graphite packing, herringbone rubber sealing ring or a combination of graphite packing and herringbone rubber sealing ring.
[0010] Preferably, the first fixing ring and the second fixing ring are mounted on the outer wall of the outward-turned portion, and a gap is left between the first fixing ring and the second fixing ring and the fixing tube.
[0011] Preferably, the outward-turned portion is made by outward-turning the kiln skin or by welding the outward-turned structure.
[0012] Preferably, the material lowering cover structure is also applicable to the exhaust gas cover structure.
[0013] Compared with the prior art, the present invention has the following technical effects: the present invention adopts a dynamic sealing structure, forms a better heat dissipation surface by setting a rotary kiln flip kiln skin, and sets heat insulation materials for the rotary kiln skin, flip kiln skin, and lower material cover, so that the rotary kiln skin, flip kiln skin, and fixed cylinder are coaxial and almost not deformed, which creates better rigid conditions for the realization of flexible sealing, and then sets a first fixed ring, a second fixed ring, a movable ring, and a fixed cylinder, and dynamically adjusts the position of the movable ring by a top screw set on the first fixed ring, so that the flexible sealing material is always filled between the movable ring, the second fixed ring, the fixed cylinder, and the flip kiln skin, thereby realizing better dynamic sealing. At the same time, a graphite packing or a herringbone rubber sealing ring with good elasticity is selected to make dynamic sealing easier to realize and can run for a long period of time. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a structural schematic diagram of the present invention.
[0015] Figure 2 for Figure 1 A partial enlarged view of point A in the middle. DETAILED DESCRIPTION
[0016] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
[0017] like Figure 1 , Figure 2 As shown, the rotary kiln material discharge cover structure comprises a rotary kiln 1 and a material discharge cover 2 installed on the rotary kiln. The material discharge end of the rotary kiln 1 is provided with an outward turning portion 3, the material discharge cover 2 is sleeved on the outward turning portion 3, and a dynamic sealing mechanism is provided between the outward turning portion 3 and the material discharge cover 2; the rotary kiln 1, the material discharge cover 2 and the outward turning portion 3 are all provided with a heat preservation material 4.
[0018] The present invention adopts an outward turning part 3 provided at the end of a rotary kiln 1. The outward turning part is made of an outward turning kiln skin or a welded outward turning structure. The outward turning part 3 turns toward the middle of the rotary kiln, and a dynamic sealing mechanism is provided between the outward turning part 3 and the material lowering cover 2. The material lowering cover 2 and the rotary kiln 1 can be sealed by the dynamic sealing mechanism. The rotary kiln 1, the material lowering cover 2 and the outward turning part 3 are all provided with a heat-insulating material 4, so that the rotary kiln body and the inverted kiln skin can be prevented from being deformed by heat. The sealing surface is not provided with a heat-insulating layer, and the sealing surface is relatively outside, and the heat is blocked from being transferred to the sealing surface by the sealing flexible material. A heat dissipation interval 5 is provided between the outward turning part 3 and the outer wall of the rotary kiln 1. In this way, a larger heat dissipation surface is formed between the outward turning part 3 and the rotary kiln 1, so that the rotary kiln cylinder and the outward turning part are further kept at a lower temperature, and the outward turning part is prevented from being deformed.
[0019] The dynamic sealing mechanism includes a fixed cylinder 6 sleeved on the outside of the everted portion 3 and fixed on the lower material cover 2, and a first fixed ring 7 and a second fixed ring 8 installed on the inner wall of the fixed cylinder 6 and sleeved on the outside of the everted portion 3. A gap is left between the first fixed ring 7, the second fixed ring 8 and the everted portion 3, and a flexible sealing material 9 is filled between the first fixed ring 7 and the second fixed ring 8. The flexible sealing material 9 is installed between the lower material cover 2 and the everted portion 3 through the fixed cylinder 6, the first fixed ring 7 and the second fixed ring 8 for sealing.
[0020] In order to ensure that the flexible sealing material 9 always maintains a reliable sealing state during long-term operation, a movable ring 10 is installed on the inner side of the first fixed ring 7 through at least two adjusting top screws 11, and the adjusting top screws 11 are installed on the first fixed ring 10, and the flexible sealing material 9 is arranged between the movable ring 10 and the second fixed ring 8. The movable ring 10 is controlled by adjusting the top screws 11 to move and squeeze the flexible sealing material 9, thereby ensuring that the flexible sealing material 9 and the fixed cylinder 6 and the eversion part 3 always maintain a reliable sealing state. The flexible sealing material 9 can be a graphite packing, a herringbone rubber sealing ring, or a combination of a graphite packing and a herringbone rubber sealing ring.
[0021] In addition, the material lowering cover structure is also applicable to the exhaust gas cover structure. Embodiment 2
[0022] In this embodiment, the first fixing ring 7 and the second fixing ring 8 are installed on the outer wall of the outward-turned portion 3, and a gap is left between the first fixing ring 7 and the second fixing ring 8 and the fixing tube 6. The rest is the same as the first embodiment. Embodiment 3
[0023] In this embodiment, the first fixing ring 7 is mounted on the inner wall of the fixing tube 6, and the second fixing ring 8 is mounted on the outer wall of the outward-turned portion 3, with a gap between the first fixing ring 7 and the outward-turned portion 3, and a gap between the second fixing ring 8 and the fixing tube 6. The rest is the same as the first embodiment. Embodiment 4
[0024] In this embodiment, the second fixing ring 8 is mounted on the inner wall of the fixing tube 6, the first fixing ring 7 is mounted on the outer wall of the outward-turned portion 3, a gap is left between the second fixing ring 8 and the outward-turned portion 3, and a gap is left between the first fixing ring 7 and the fixing tube 6. The rest is the same as the first embodiment.
[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims
1. A rotary kiln material cover structure, comprising a rotary kiln and a material cover installed on the rotary kiln, characterized in that: The unloading end of the rotary kiln is provided with an outward turning portion, the unloading cover is sleeved on the outward turning portion, and a dynamic sealing mechanism is provided between the outward turning portion and the unloading cover; The rotary kiln, the material discharging cover and the outer turning part are all provided with heat-insulating materials.
2. The rotary kiln lower material cover structure according to claim 1 is characterized in that: A heat dissipation interval is arranged between the outward turning portion and the outer wall of the rotary kiln.
3. The rotary kiln lower cover structure according to claim 1 or 2, characterized in that: The dynamic sealing mechanism includes a fixed cylinder which is sleeved on the outside of the outward-turned part and fixed on the lower material cover, and a first fixed ring and a second fixed ring which are installed on the inner wall of the fixed cylinder and sleeved on the outside of the outward-turned part. A gap is left between the first fixed ring, the second fixed ring and the outward-turned part, and a flexible sealing material is filled between the first fixed ring and the second fixed ring.
4. The rotary kiln lower material cover structure according to claim 3 is characterized in that: A movable ring is installed on the inner side of the first fixed ring through at least two adjusting top screws, the adjusting top screws are installed on the first fixed ring, and the flexible sealing material is arranged between the movable ring and the second fixed ring.
5. The rotary kiln lower cover structure according to claim 4 is characterized in that: The flexible sealing material is a graphite packing, a herringbone rubber sealing ring or a combination of a graphite packing and a herringbone rubber sealing ring.
6. The rotary kiln lower material cover structure according to claim 3 is characterized in that: The first fixing ring and the second fixing ring are installed on the outer wall of the outward-turned portion, and a gap is left between the first fixing ring and the second fixing ring and the fixing tube.
7. The rotary kiln lower cover structure according to claim 1, characterized in that: The outward-turning part is made by turning the kiln skin outward or by welding the outward-turning structure.
8. The rotary kiln lower material cover structure according to claim 3 is characterized in that: The first fixing ring is installed on the inner wall of the fixing tube, and the second fixing ring is installed on the outer wall of the outward-turned part. A gap is left between the first fixing ring and the outward-turned part, and a gap is left between the second fixing ring and the fixing tube.
9. The rotary kiln lower material cover structure according to claim 3, characterized in that: The second fixing ring is installed on the inner wall of the fixing tube, the first fixing ring is installed on the outer wall of the outward-turned part, a gap is left between the second fixing ring and the outward-turned part, and a gap is left between the first fixing ring and the fixing tube.
10. The rotary kiln lower cover structure according to claim 3, characterized in that: The material lowering cover structure is also applicable to the tail gas cover structure.