Sealing system of a rotary reactor

Abstract

A sealing system for a rotary reactor, comprising an axial sealing mechanism, a radial sealing mechanism, a limiting hoisting mechanism and a sealing cylinder; the sealing cylinder further comprises a first fixed ring; the axial sealing mechanism is arranged on the annular end of the cylinder of the rotary reactor and is sleeved on the sealing cylinder; the radial sealing mechanism is arranged on the other end of the sealing cylinder; the limiting hoisting structure comprises a limiting mechanism and a hoisting mechanism. The sealing system for a rotary reactor of the present invention forms a multi-stage series sealing mode of radial sealing-air sealing-axial sealing by connecting the axial sealing mechanism, the radial sealing mechanism, the limiting hoisting mechanism and the sealing cylinder, thereby achieving good sealing of the rotary reactor; the axial and radial displacements caused by the heat of the cylinder can be absorbed, so that the cylinder and the hood tail perform the same jumping and swaying during the rotation of the cylinder, thereby avoiding the problem of sealing failure caused by the jumping and swaying of the cylinder in conventional sealing schemes.

Description

Technical Field

[0001] The invention relates to a sealing system of a rotary reactor. Background Art

[0002] For urban / county domestic waste, industrial waste salt and oily sludge are two types of solid wastes with high toxic substances and a large historical stock. The need for harmless resource disposal is also very urgent. Compared with direct incineration, the thermochemical conversion process with pyrolysis and gasification as the core has the advantages of high resource utilization rate, simple flue gas treatment, and flexible scale. It has developed rapidly in the field of organic solid waste disposal.

[0003] The pyrolysis process of organic solid waste is carried out in a high-temperature oxygen-free environment, which can convert the organic components in the solid waste into condensable volatiles, non-condensable gases mainly including CO, CO2, CH4, H2, and coke. Among the common pyrolysis reactors, the rotary reactor has the advantages of wide adaptability to raw materials, easy scale-up, easy maintenance, etc., and has received widespread attention. Since the gas products produced by the pyrolysis of organic solid waste are flammable and explosive, there are high requirements for the air tightness of the equipment. For the pyrolysis rotary reactor, its cylinder is made of metal, which expands and deforms during the operation and heating process. In addition, due to the large size of the rotary reactor, there are processing errors during the processing process. These problems cause it to jump and move during operation. The existing rotary reactor sealing methods include fish scale seals, labyrinth seals, packing seals, etc., all of which cannot meet the high air tightness requirements required for large-size rotary reactors.

[0004] Patent CN 106090232B mainly adopts the traditional packing sealing method, which connects the rotating annular sealing part of the cylinder and the kiln tail cover through an elastic connection component and a sliding component to form an annular cavity, and a flexible sealing packing is arranged in the cavity to form a seal. This solution can absorb the axial expansion of the cylinder through the pre-tightening force of the elastic connection component. However, it cannot deal with the radial expansion of the cylinder and the movement and jumping during the rotation process, resulting in a short circuit of the packing sealing surface and failure.

[0005] Patent CN205784525U adopts a series sealing scheme of primary labyrinth seal, secondary graphite packing seal, tertiary graphite ring + graphite packing + fish scale seal. However, it can only offset the deformation and vibration of the cylinder during operation by compressing the packing during assembly, and cannot meet the requirement that the packing always fits the dynamic and static sealing surfaces during the rotation of the cylinder, which eventually leads to the formation of gas channels on the sealing surface and failure.

[0006] Therefore, there is an urgent need for a rotary reactor sealing system that can effectively solve the sealing failure caused by jumping and swaying during the rotation of a large-sized rotary reactor and improve the sealing performance. Summary of the invention

[0007] The present invention aims at the problem of poor sealing performance of rotary reactors in the prior art, and provides a sealing system for a rotary reactor. The sealing system for a rotary reactor of the present invention forms a multi-stage series sealing mode of radial sealing-gas sealing-axial sealing through the connection relationship between the axial sealing mechanism, the radial sealing mechanism, the limit hoisting mechanism and the sealing cylinder, so as to achieve good sealing of the rotary reactor, effectively solve the problem of sealing failure caused by jumping and swaying of large-sized rotary reactors during rotation, and greatly improve the sealing performance of the rotary reaction system.

[0008] A sealing system for a rotary reactor, comprising an axial sealing mechanism, a radial sealing mechanism, a position limiting hoisting mechanism and a sealing cylinder;

[0009] The sealing cylinder is used to be sleeved on the cylinder of the rotary reactor to form an interlayer space; the sealing cylinder also includes a first fixing ring, which is fixedly connected to the annular end of the sealing cylinder and has an extension portion along the axial direction; the other end of the sealing cylinder is fixedly connected to the cover tail of the rotary reactor;

[0010] The axial sealing mechanism is arranged on the annular end of the sealing cylinder sleeved on the cylinder of the rotary reactor;

[0011] The radial sealing mechanism is arranged at the other end of the sealing cylinder;

[0012] The limiting hoisting structure comprises a limiting mechanism and a hoisting mechanism; the limiting mechanism is arranged on the side wall of the sealing cylinder and is located in the interlayer space; the hoisting mechanism is arranged on the outer side wall of the top of the hood tail of the rotary reactor.

[0013] In the present invention, preferably, the axial sealing mechanism includes a first insulation ring, a first rotating ring, a first sealing packing, a packing pressure ring and a clamping mechanism; the first insulation ring is used to be fixedly connected to the cylinder of the rotary reactor; the first rotating ring is located and fixedly connected to the first insulation ring; the extension portion of the first fixed ring is sleeved on the first rotating ring, and a plurality of sealing packings are axially arranged in the gap between the extension portion of the first fixed ring and the first rotating ring; the packing pressure ring is compressed and arranged on the opening side of the sealing packing for axial sealing; the axial cross-section of the first fixed ring along the sealing cylinder is L-shaped.

[0014] In the present invention, the clamping mechanism is preferably a bolt.

[0015] In the present invention, preferably, the packing pressure ring and the first fixing ring are fixed by compression bolts for sealing.

[0016] In the present invention, preferably, the radial sealing mechanism includes a second insulation ring, a first reinforcing rib, a second fixed ring, a second rotating ring and a second sealing packing; the second insulation ring is used to be fixedly connected to the cylinder of the rotary reactor; the second rotating ring is located on and fixedly connected to the second insulation ring; the second fixed ring is fixedly connected to the end of the cover tail of the cylinder of the rotary reactor; a plurality of the second sealing packings are circumferentially stacked between the second fixed ring and a circular surface of the second rotating ring to form a sealing surface for radial sealing.

[0017] Wherein, the radial sealing mechanism may further include a first reinforcing rib; the first reinforcing rib is located on and fixedly connected to the second thermal insulation ring to enhance the mechanical strength of the second rotating ring.

[0018] In the present invention, preferably, the limiting mechanism includes an inverted V-shaped slide rail and a V-shaped bearing; the inverted V-shaped slide rail is fixedly connected to the cylinder of the rotary reactor; the inverted V-shaped slide rail and the V-shaped bearing are limitedly matched, and the V-shaped bearing is connected to the side wall of the sealing cylinder.

[0019] Wherein, the V-shaped bearing can be arranged along the circumference of the barrel of the rotary reactor, and the number of the V-shaped bearing is preferably one or more.

[0020] Wherein, the limiting mechanism may also include a connecting assembly, a fixing bolt and a clamping nut; the V-shaped bearing and the connecting assembly are fixed with the fixing bolt; the connecting assembly passes through the side wall of the sealing cylinder and is fixed with the sealing cylinder through a clamping nut; wherein, the internal thread of the clamping nut is connected to the connecting assembly, and the external thread of the clamping nut is connected to the sealing cylinder; preferably, a clamping spring is mounted on the connecting assembly.

[0021] Preferably, the number of the V-bearings, the fixing bolts, the connecting assemblies or the clamping nuts is 4, 6, 8 or 10.

[0022] In the present invention, preferably, the sealing system of the rotary reactor also includes a plurality of second reinforcing ribs, and the second reinforcing ribs are arranged along the circumference of the sealing cylinder; one end face of the second reinforcing rib is fixedly connected to the hood tail of the rotary reactor, and the second reinforcing ribs are used to strengthen the mechanical strength of the sealing cylinder.

[0023] In the present invention, preferably, the side wall of the sealing cylinder is provided with an air inlet, a pressure measuring point or a temperature measuring point. According to the specific sealing requirements, the pressure and temperature of the protective gas in the cavity are set. The pressure measuring point is mainly to ensure the sealing effect. During operation, when the protective gas pressure is lower than the set value, the protective gas flow rate is started / increased to increase the pressure to the set value. The temperature measuring point is mainly used to monitor the temperature of each sealing mechanism. When the temperature exceeds the safety value, the protective gas is replaced to achieve a cooling effect. Through this sealing method, the safe and effective operation of the sealing system is ultimately achieved.

[0024] In the present invention, in the rotary reactor sealing system, an ash blocking mechanism can be provided between the radial sealing mechanism and the slit between the hood tail of the rotary reactor and the cylinder of the rotary reactor by means of asbestos, graphite filler, etc., to prevent solid particles from entering the sealing surface during operation and causing increased wear of the sealing surface.

[0025] On the basis of being in accordance with the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present invention.

[0026] The reagents and raw materials used in the present invention are commercially available.

[0027] The positive and progressive effects of the present invention are:

[0028] 1. The sealing system of the rotary reactor of the present invention forms a multi-stage series sealing mode of radial sealing-gas sealing-axial sealing through the connection relationship between the axial sealing mechanism, the radial sealing mechanism, the limit hoisting mechanism and the sealing cylinder, so as to achieve good sealing of the rotary reactor; it can absorb the axial and radial displacement caused by the heat of the cylinder, so that the cylinder and the cover tail perform the same jumping and swaying during the rotation of the cylinder, thereby avoiding the problem of sealing failure caused by the jumping and swaying of the cylinder in the conventional sealing scheme.

[0029] 2. The sealing system of the rotary reactor of the present invention ensures safe and effective operation of the sealing system by coupling the intelligent feedback control method of key parameters such as temperature and pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the sealing system of the rotary reactor in Example 1.

[0031] Figure 2 This is the AA view of the limiting mechanism of Example 1.

[0032] Description of reference numerals:

[0033] 1. Rotary reactor cylinder; 2. First heat insulation ring; 3. Packing pressure ring; 4. First rotating ring; 5. Clamping bolt; 6. First sealing packing; 7. First fixed ring; 8. Sealing cylinder; 9. Inverted V-shaped slide rail; 10. V-shaped bearing; 11. Fixing bolt; 12. Clamping spring; 13. Connecting assembly; 14. Clamping nut; 15. First reinforcing rib; 16. Second heat insulation ring; 17. Second rotating ring; 18. Second sealing packing; 19. Second fixed ring; 20. Dust retaining ring; 21. Second reinforcing rib; 22. Air inlet; 23. Pressure measuring point; 24. Temperature measuring point; 25. Hoisting mechanism DETAILED DESCRIPTION

[0034] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples. The experimental methods in the following examples without specifying specific conditions are carried out according to conventional methods and conditions, or selected according to the product specifications.

[0035] Example 1

[0036] A sealing system for a rotary reactor, such as Figure 1 As shown, it is composed of an axial sealing mechanism, a limit hoisting mechanism, a radial sealing mechanism, and a sealing cylinder 8. The sealing cylinder 8 also includes a first fixed ring 7. The first fixed ring 7 is fixedly connected to the annular end of the sealing cylinder 8 through a flange and is provided with an extension portion along the axial direction; the other end of the sealing cylinder 8 is fixedly connected to the cover tail of the rotary reactor;

[0037] The axial sealing mechanism is arranged on the annular end of the sealing cylinder 8 which is sleeved on the cylinder 1 of the rotary reactor;

[0038] The radial sealing mechanism is arranged at the other end of the sealing cylinder 8;

[0039] The limiting hoisting mechanism comprises a limiting mechanism and a hoisting mechanism 25; the limiting mechanism is arranged on the side wall of the sealing cylinder 8 and is located in the interlayer space; the hoisting mechanism 25 is arranged on the outer side wall of the top of the hood tail of the rotary reactor.

[0040] The axial sealing mechanism includes a first insulation ring 2, a first rotating ring 4, a first sealing packing 6, a packing pressure ring 3 and a clamping bolt 5; the first insulation ring 2 is fixedly connected to the barrel 1 of the rotary reactor, the first rotating ring 4 is located on the first insulation ring 2 and is fixedly connected to the first insulation ring 2, and the two rotate together with the barrel 1 of the rotary reactor. Three layers of the first sealing packing 6 are axially arranged between the first fixed ring 7 and the first rotating ring 4, and the compression force of the sealing packing is provided by the packing pressure ring 3 and the clamping bolt 5 to ensure the sealing performance of the packing.

[0041] The radial sealing mechanism includes a second insulation ring 16, a first reinforcing rib 15, a second fixed ring 19, a second rotating ring 17 and a second sealing packing 18; the second insulation ring 16 is fixedly connected to the barrel 1 of the rotary reactor, and the second rotating ring 17 is located on the first insulation ring 2 and fixedly connected to the second insulation ring 16, rotating with the barrel 1 of the rotary reactor. The second fixed ring 19 is fixedly connected to the hood tail. Three layers of second sealing packing 18 are arranged circumferentially stacked between the second fixed ring 19 and the second rotating ring 17, and the compression force is provided by the deformation of the packing during pre-assembly. The first reinforcing rib 15 is located and fixedly connected to the second insulation ring 16, and is used to strengthen the mechanical strength of the second rotating ring 17.

[0042] The limiting mechanism includes an inverted V-shaped slide rail 9, a V-shaped bearing 10, a connecting assembly 13, a fixing bolt 11 and a clamping nut 14; the inverted V-shaped slide rail 9 is a full-circle ring sleeved on the rotary reactor cylinder and is fixedly connected to the cylinder 1 by bolts. The V-shaped bearing 10 is limited in position with the inverted V-shaped slide rail 9, such as Figure 2 As shown, the number of V-bearing 10, connecting assembly 13 and fixing bolts 11 are all 6; the V-bearing 10 and connecting assembly 13 are fixed with fixing bolts 11; the connecting assembly 13 passes through the side wall of the sealing cylinder 8 and is fixed with the sealing cylinder 8 through the clamping nut 14; the internal thread of the clamping nut 14 is connected with the connecting assembly 13, and the external thread of the clamping nut 14 is connected with the sealing cylinder 8; a clamping spring 12 is sleeved on the connecting assembly 13. The cover tail is not supported, and anti-rotation fixation is only achieved through the lifting mechanism 25. Through the limit between the V-bearing 10 and the inverted V-shaped slide rail 9, and the setting of the connecting assembly 13, it can be ensured that there is only mutual rotation between the cylinder 1 and the cover tail of the rotary reactor, so that the sealing packing and the sealing surface are always in contact, and the problem of short-circuit failure of the sealing surface caused by jumping and swaying during the rotation of the cylinder is prevented.

[0043] An ash retaining ring 20 is also provided between the radial sealing mechanism and the slit between the cover tail and the barrel 1 of the rotary reactor. The ash retaining ring 20 is made of asbestos to prevent solid particles from invading the sealing surface during operation.

[0044] The second reinforcing rib 21 is arranged along the circumference of the sealing cylinder 8 ; one end surface of the second reinforcing rib 21 is fixedly connected to the cover tail of the rotary reactor, and the second reinforcing rib 21 is used to strengthen the mechanical strength of the sealing cylinder 8 .

[0045] An air inlet 22, a pressure measuring point 23 or a temperature measuring point 24 is provided on the side wall of the sealing cylinder 8. Nitrogen, steam, flue gas or other protective gases can be introduced into the cavity through the air inlet 22, and the pressure and temperature of the protective gas in the cavity can be monitored in real time through the pressure measuring point 23, the temperature measuring point 24, etc. The protective gas intake is regulated by the feedback of pressure and temperature to achieve safe and effective operation of the sealing system.

[0046] Application Example 1

[0047] This application example adopts the rotary reactor sealing system of Example 1 for sealing. For the 100t / d pyrolysis project of domestic sieve oversize, the diameter of the barrel 1 of the rotary reactor is 1.6m, and the axial sealing and radial sealing mechanisms both use 3-cut 120° arranged tetrafluoro graphite packing, and the packing specification is 40*40mm. The diameter of the radial sealing mechanism is 2.1m, the diameter of the axial sealing mechanism is 1.95m, and the diameter of the sealing barrel 8 is 2.3m. The closed cavity between the radial sealing mechanism and the axial sealing mechanism is filled with nitrogen, and the rated pressure of nitrogen is 500Pa. During operation, when the nitrogen pressure is lower than 500Pa, nitrogen is introduced until the nitrogen pressure returns to 500Pa. Two circles of ash retaining rings 20 are set, and the ash retaining rings 20 use a full circle of asbestos with a size of 25*25mm. Six sets of V-shaped bearings 10 and inverted V-shaped slide rails 9 are provided on the sealing barrel 8. Limiting mechanisms. The hood tail is hoisted on the steel frame as a whole. The gas leakage during the operation of the rotary reactor is less than 3.3%.

[0048] Application Example 2

[0049] This application example adopts the rotary reactor sealing system of Example 1 for sealing. For the 200t / d pyrolysis project of domestic sieve oversize, the diameter of the barrel 1 of the rotary reactor is 2m, and the axial sealing and radial sealing mechanisms both use carbon fiber graphite packing with 4 cuts arranged at 90°, and the packing specification is 50*50mm. The diameter of the radial sealing mechanism is 2.7m, the diameter of the axial sealing mechanism is 2.4m, and the diameter of the sealing barrel 8 is 3m. The closed cavity between the radial sealing mechanism and the axial sealing mechanism is filled with cold flue gas, and the rated pressure of the cold flue gas is 600Pa. During operation, when the nitrogen pressure is lower than 600Pa, nitrogen is introduced until the nitrogen pressure returns to 600Pa. Three circles of ash retaining rings 20 are set, and the ash retaining rings 20 use a full circle of graphite filler with a size of 30*30mm. Ten groups of V-shaped bearings 10 and inverted V-shaped slide rails 9 are provided on the sealing barrel 8. The hood tail is hoisted on the steel frame as a whole. The gas leakage during the operation of the rotary reactor was less than 4.0%.

Claims

1. A sealing system for a rotary reactor, characterized in that: It includes an axial sealing mechanism, a radial sealing mechanism, a position limiting hoisting mechanism and a sealing cylinder; The sealing cylinder is used to be sleeved on the cylinder of the rotary reactor to form an interlayer space; the sealing cylinder also includes a first fixing ring, which is fixedly connected to the annular end of the sealing cylinder and has an extension portion along the axial direction; the other end of the sealing cylinder is fixedly connected to the cover tail of the rotary reactor; The axial sealing mechanism is arranged on the annular end of the sealing cylinder sleeved on the cylinder of the rotary reactor; The radial sealing mechanism is arranged at the other end of the sealing cylinder; The position limiting and hoisting mechanism comprises a position limiting mechanism and a hoisting mechanism; the position limiting mechanism is arranged on the side wall of the sealing cylinder and is located in the interlayer space; the hoisting mechanism is arranged on the outer side wall of the top of the hood tail of the rotary reactor; The limiting mechanism includes an inverted V-shaped slide rail and a V-shaped bearing; the inverted V-shaped slide rail is fixedly connected to the cylinder of the rotary reactor; the inverted V-shaped slide rail and the V-shaped bearing are limitedly matched, and the V-shaped bearing is connected to the side wall of the sealing cylinder.

2. The sealing system according to claim 1, characterized in that The axial sealing mechanism includes a first insulation ring, a first rotating ring, a first sealing packing, a packing pressure ring and a clamping mechanism; the first insulation ring is used to be fixedly connected to the cylinder of the rotary reactor; the first rotating ring is located on and fixedly connected to the first insulation ring; the extension portion of the first fixed ring is sleeved on the first rotating ring, and a plurality of the first sealing packings are axially arranged in the gap between the extension portion of the first fixed ring and the first rotating ring; the packing pressure ring is compressed and arranged on the opening side of the first sealing packing for axial sealing; the axial section of the first fixed ring along the sealing cylinder is L-shaped.

3. The sealing system according to claim 2, characterized in that The clamping mechanism is a bolt; And / or, the packing pressure ring and the first fixing ring are fixed by compression bolts for sealing.

4. The sealing system according to claim 1, characterized in that The radial sealing mechanism includes a second insulation ring, a first reinforcing rib, a second fixed ring, a second rotating ring and a second sealing packing; the second insulation ring is used to be fixedly connected to the cylinder of the rotary reactor; the second rotating ring is located on and fixedly connected to the second insulation ring; the second fixed ring is fixedly connected to the end of the cover tail of the cylinder of the rotary reactor; a plurality of the second sealing packings are circumferentially stacked between the second fixed ring and a circular surface of the second rotating ring to form a sealing surface for radial sealing.

5. The sealing system according to claim 4, characterized in that The radial sealing mechanism also includes a first reinforcing rib; the first reinforcing rib is located on and fixedly connected to the second heat insulation ring, and is used to enhance the mechanical strength of the second rotating ring.

6. The sealing system according to claim 1, characterized in that The V-shaped bearing is arranged along the circumference of the barrel of the rotary reactor, and the number of the V-shaped bearing is one or more; And / or, the limiting mechanism also includes a connecting assembly, a fixing bolt and a clamping nut; the V-shaped bearing and the connecting assembly are fixed with the fixing bolt; the connecting assembly passes through the side wall of the sealing cylinder and is fixed to the sealing cylinder through the clamping nut; wherein the internal thread of the clamping nut is connected to the connecting assembly, and the external thread of the clamping nut is connected to the sealing cylinder.

7. The sealing system according to claim 6, characterized in that A compression spring is sleeved on the connecting assembly.

8. The sealing system according to claim 6, characterized in that The number of the V-shaped bearings, the fixing bolts, the connecting components or the clamping nuts is 4, 6, 8 or 10.

9. The sealing system according to claim 1, characterized in that The sealing system of the rotary reactor also includes a plurality of second reinforcing ribs, which are arranged along the circumference of the sealing cylinder; one end face of the second reinforcing rib is fixedly connected to the cover tail of the rotary reactor, and the second reinforcing rib is used to strengthen the mechanical strength of the sealing cylinder.

10. The sealing system according to claim 1, characterized in that The side wall of the sealing cylinder is provided with an air inlet, a pressure measuring point or a temperature measuring point.

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