Energy-saving and environment-friendly composite sealing device and method for acidification kiln

Abstract

A sealing mechanism comprises a movable sealing ring, a static sealing ring, a sealing filler, a fixing seat and a metal expansion joint, an annular lubricating oil groove is formed in the surface of the static sealing ring and communicates with an oil supply mechanism through an oil inlet hole, and the sealing filler is arranged in the annular lubricating oil groove. A stable oil film is formed between the movable sealing ring and the static sealing ring to form a dynamic sealing layer, a supporting mechanism is arranged at the lower end of the fixing base, the metal expansion joint is arranged between the fixing base and the discharging cover body, and sealing filler is arranged in a filler shell arranged on the fixing base. And a gland fixing disc arranged on the fixed seat is provided with a sealing gland, a screw rod and a pressure spring, and the gland fixing disc can extrude the sealing filler. Combined sealing is adopted, the distance change between the barrel and the discharging cover body caused by ascending and descending of the barrel is absorbed, conventional fish scale sealing is replaced, the sealing effect is remarkably improved, and the air leakage rate is reduced.

Description

Technical Field

[0001] This invention relates to an acidification kiln sealing technology, and in particular to an energy-saving and environmentally friendly composite sealing device and method for acidification kilns. Background Technology

[0002] In conventional metallurgical and chemical industries, rotary kilns often use flexible fish-scale seals for their kiln head and tail. These seals are formed by stacking multiple layers of steel sheets to create a flexible contact surface, making installation and maintenance relatively simple. The flexibility of the steel sheets allows them to adapt to the thermal expansion, movement, and deformation of the kiln shell. However, in the lithium spodumene acidification rotary kiln industry, fish-scale seals suffer from structural defects, leading to problems such as air leakage, acid gas leakage, high failure rate of the sealing device, increased air volume in the kiln tail dust removal system, and increased environmental treatment pressure. Furthermore, the leaked acid gas creates a harsh on-site operating environment and increases maintenance costs for enterprises. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an energy-saving and environmentally friendly composite sealing device and method for acidification kilns that has a reasonable design, good sealing effect and long service life.

[0004] The technical solution of this invention is: An energy-saving and environmentally friendly composite sealing device for an acidification kiln includes an acidification kiln shell and a discharge hood, with a sealing mechanism between them. The sealing mechanism includes a dynamic sealing ring, a static sealing ring, sealing packing, a fixed seat, and a metal expansion joint. The dynamic sealing ring is connected to the acidification kiln shell, and the static sealing ring is connected to the fixed seat. The surface of the static sealing ring is provided with an annular lubricating oil groove, which is connected to an oil supply mechanism through an oil inlet, so that a stable oil film is formed between the dynamic sealing ring and the static sealing ring, forming a dynamic sealing layer. A support mechanism is provided at the lower end of the fixed seat. The metal expansion joint is provided between the fixed seat and the discharge hood. A packing shell is provided on the fixed seat, and sealing packing is provided inside the packing shell. A pressure plate fixing plate is provided on the fixed seat, and a sealing pressure plate, a screw, and a compression spring are provided on the pressure plate fixing plate, which can compress the sealing packing.

[0005] Furthermore, cylinders are evenly distributed around the circumference between the fixed seat and the discharge hood. The piston rod of the cylinder is rotatably connected to the fixed seat, and the extension and retraction length of the piston rod can adjust the gap between the dynamic sealing ring and the static sealing ring.

[0006] Furthermore, the support mechanism includes a frame, an adjusting plate, adjusting bolts, and a support shaft. The two ends of the support shaft are mounted on the adjusting plate via bearing seats. A connecting bolt is provided between the adjusting plate and the frame. The adjusting plate is provided with adjusting bolts, which can adjust the height and tilt angle of the adjusting plate.

[0007] Furthermore: there are two support shafts arranged in parallel and spaced apart, and an axial plate is provided at the lower part of the fixed seat, the axial plate being in contact with the support shaft.

[0008] Furthermore: the static sealing ring has three annular lubricating oil grooves, which are spaced apart. The oil inlet hole is connected to all three annular lubricating oil grooves. The static sealing ring is also provided with an oil drain hole. The annular lubricating oil grooves are not connected to the oil drain hole, and waste grease is discharged from the oil drain hole.

[0009] Furthermore, the dynamic sealing ring and the acidification kiln shell, the static sealing ring and the fixed seat, the fixed seat and the metal expansion joint, and the metal expansion joint and the discharge hood are all connected by screw holes and bolts, respectively.

[0010] Furthermore, a guide rod is provided between the discharge hood and the fixed base. One end of the guide rod is connected to the discharge hood by a nut, and the other end of the guide rod is located in the U-shaped groove on the fixed base.

[0011] An energy-saving and environmentally friendly composite sealing method for an acidification kiln utilizing the aforementioned energy-saving and environmentally friendly composite sealing device includes the following steps: a. Install the dynamic sealing ring, static sealing ring, sealing packing, fixed seat and metal expansion joint into place, and adjust the height and inclination of the support mechanism to make the dynamic sealing ring and static sealing ring concentric; b. Adjust the extension length of the piston rod of the cylinder to maintain a certain pressure between the dynamic sealing ring and the static sealing ring to ensure reliable contact of the sealing rings. Add lubricating grease through the oil inlet to form a stable oil film between the dynamic sealing ring and the static sealing ring, thus forming a dynamic sealing layer. c. Adjust the sealing gland, screw, and clamping spring so that the sealing packing can squeeze the acidification kiln cylinder to form a seal; d. During normal operation of the acidification kiln, as the temperature of the cylinder rises, the cylinder expands and elongates. The dynamic sealing ring and the static sealing ring move axially with the cylinder. The metal expansion joint absorbs the axial elongation of the cylinder, while the piston rod of the cylinder retracts under the pressure of the cylinder's downward movement. During this process, reliable contact between the dynamic sealing ring and the static sealing ring is always maintained. e. As the temperature of the acidification kiln cylinder stabilizes, the total length of the cylinder no longer changes, and it is in a stable working state.

[0012] Furthermore: the acidification kiln cylinder maintains an upward and downward reciprocating motion of 25-30mm and 25-30mm respectively, and the metal expansion joint follows the upward and downward movement of the cylinder, undergoing corresponding elongation and compression changes, and the piston rod of the cylinder performs corresponding extension or retraction actions.

[0013] Furthermore: Lubricating grease is periodically and quantitatively delivered into the annular lubricating oil tank by an electric dry oil pump, and waste grease is discharged through the oil drain hole.

[0014] The beneficial effects of this invention are: 1. This invention can effectively reduce the sealing area, significantly reduce the air leakage rate, and eliminate acid leakage while the acidification kiln is operating normally (feeding, discharging, and dust collection). It can also significantly improve the service life, reduce the dust collection air volume of acidic gas at the kiln tail, reduce environmental protection disposal pressure, and lower the enterprise's operation and maintenance costs.

[0015] 2. This invention adopts a composite sealing structure (a combination of a metal expansion joint and a cylinder) to absorb the change in distance between the cylinder and the discharge hood caused by the upward and downward movement of the cylinder, replacing the conventional fish scale seal, significantly improving the sealing effect and reducing the air leakage rate.

[0016] 3. This invention delivers lubricating grease into the lubricating oil tank periodically and quantitatively using an electric dry oil pump. The lubricating grease forms a stable oil film between the dynamic and static sealing rings, filling microscopic uneven surfaces and forming a dynamic sealing layer. At the same time, it reduces the coefficient of friction between the dynamic and static sealing rings and reduces wear.

[0017] 4. The support height and support slope of the sealing mechanism of the present invention are adjustable to accommodate errors caused by processing and installation of the sealing device and improve the sealing effect.

[0018] 5. In this invention, the cylinder piston rod extends and pushes the fixed seat (static sealing ring, metal expansion joint, and sealing pressure ring move accordingly) towards the dynamic seal, and forms a certain pressure between the dynamic and static sealing rings to ensure reliable contact of the sealing rings and improve the sealing effect.

[0019] 6. This invention combines metal expansion joints and packing to form a multi-layered sealed cylinder, which has a wide range of applications, is easy to promote and implement, and has good economic benefits. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an energy-saving and environmentally friendly composite sealing device for an acidification kiln; Figure 2 for Figure 1 The image shows a right view of an energy-saving and environmentally friendly composite sealing device for an acidification kiln. Figure 3 for Figure 1 A partially enlarged view of the central sealing mechanism; Figure 4 for Figure 1 Schematic diagram of the supporting mechanism; Figure 5 for Figure 4 Side view of the support mechanism shown; Figure 6 for Figure 4 Top view of the support mechanism shown; Figure 7 for Figure 1 Schematic diagram of the structure of the static sealing ring; Figure 8 for Figure 7 Sectional view A-A; Figure 9 for Figure 8 Enlarged view at point I; Figure 10 for Figure 7 Sectional view of B-B; Figure 11 for Figure 8 Enlarged view of point D in the middle. Detailed Implementation

[0021] Example: See Figure 1 -- Figure 11 In the diagram, 1-acidification kiln cylinder, 2-sealing mechanism, 3-discharge hood, 4-support mechanism, 5-dynamic sealing ring, 6-static sealing ring, 7-fixed seat, 8-pressure cover fixing plate, 9-sealing pressure cover, 10-compression spring, 11-guide rod, 12-cylinder, 13-metal expansion joint, 14-sealing packing, 15-packing housing, 16-electric dry oil pump, 41-frame, 42-connecting bolt, 43-adjusting bolt, 44-support shaft, 45-adjusting plate, 46-bearing seat, 61-oil inlet, 62-annular oil groove, 63-connecting screw hole, 64-oil drain hole.

[0022] The main components of the energy-saving and environmentally friendly composite sealing device for acidification kilns are: dynamic sealing ring 5, static sealing ring 6, fixed seat 7, sealing packing 14, sealing gland 9, compression spring 10, gland fixing plate 8, metal expansion joint 13, cylinder 12, discharge hood 3, support mechanism 4, guide rod 11, etc.

[0023] The dynamic sealing ring 5 is bolted to the acidification kiln body 1, and moves together with the acidification kiln body 1. The static sealing ring 6 is bolted to the fixed seat 7, and the piston rod of the cylinder 12 is hinged to the fixed seat 7. The other end of the cylinder 12 is connected to the discharge hood 3. A metal expansion joint 13 is provided between the fixed seat 7 and the discharge hood 3 on the outside of the acidification kiln body 1. A pressure cap fixing plate 8 is provided between the metal expansion joint 13 and the fixed seat 7. The sealing pressure cap 9 and the compression spring 10 are fixed to the pressure cap fixing plate 8 with bolts with holes. The compression spring 10 presses the sealing pressure cap 9 onto the sealing packing 14, forming an axial seal between the acidification kiln body 1 and the sealing mechanism. A support mechanism 4 is provided below the fixed seat 7. The support mechanism 4 is used to support the static sealing ring 6, the fixed seat 7, the sealing pressure cap 9, and the metal expansion joint 13. The support height and support slope of the support mechanism are adjustable to accommodate errors caused by the processing and installation of the sealing mechanism 4.

[0024] The support mechanism 4 includes a frame 41, an adjusting plate 45, adjusting bolts 43, and support shafts 44. Both ends of the support shafts 44 are mounted on the adjusting plate 45 via bearing seats 46. Connecting bolts 42 are provided between the adjusting plate 45 and the frame 41. Adjusting bolts 43 are provided on the adjusting plate 45 to adjust its height and tilt angle. Two support shafts 44 are arranged parallel and spaced apart. An axial plate is provided at the lower part of the fixed base 7, and the axial plate contacts the support shafts 44.

[0025] A guide rod 11 is provided between the discharge hood 3 and the fixed seat 7. One end of the guide rod 11 is connected to the discharge hood 3 by a nut, and the other end of the guide rod 11 is located in the U-shaped groove on the fixed seat 7, which can prevent the fixed seat 7 from rotating.

[0026] Five oil inlet holes 61 are evenly distributed around the circumference on the outer surface of the static sealing ring 6. Three annular oil grooves 62 are formed on the contact surface between the static sealing ring 6 and the dynamic sealing ring 5. The lubricating oil grooves 62 are interconnected with the circumferentially distributed oil inlet holes 61. The lubricating oil is supplied via an electric dry oil pump 16 (e.g., ...). Figure 2 As shown, grease is periodically and quantitatively fed into the lubrication oil tank 62. The grease forms a stable oil film between the dynamic sealing ring 5 and the static sealing ring 6, filling microscopic uneven surfaces and forming a dynamic sealing layer. At the same time, it reduces the coefficient of friction between the dynamic sealing ring 5 and the static sealing ring 6, reducing wear.

[0027] Before operating the acidification kiln, compressed air should first be introduced into the rodless chamber of cylinder 12 to extend the piston rod of cylinder 12 and push the fixed seat 7 (with the static sealing ring 6, metal expansion joint 13, and sealing gland 9 moving accordingly) towards the dynamic sealing ring 5, creating a certain pressure between the dynamic sealing ring 5 and the static sealing ring 6 to ensure reliable contact between the sealing rings. During normal operation, as the temperature of the acidification kiln shell 1 increases, the acidification kiln shell 1 expands and elongates. The dynamic sealing ring 5 and the static sealing ring 6 move axially with the acidification kiln shell 1. The metal expansion joint 13 absorbs the axial elongation of the acidification kiln shell 1, while the piston rod of cylinder 12 retracts under the downward pressure of the acidification kiln shell 1. Throughout this process, reliable contact between the dynamic and static sealing rings, dynamic sealing ring 5 and static sealing ring 6, is maintained. As the temperature of the acidification kiln shell 1 stabilizes, the total length of the shell no longer changes. The acidification kiln cylinder 1 maintains an upward (25-30mm) and downward (25-30mm) reciprocating motion along the axis. The metal expansion joint 13 follows the upward and downward movement of the acidification kiln cylinder 1, undergoing corresponding elongation and compression changes. The piston rod of the cylinder 12 extends or retracts accordingly.

[0028] A pressure relief valve is installed in the air circuit of cylinder 12. When the piston rod retracts and causes excessive pressure, the pressure is relieved through the pressure relief valve to keep the air circuit at a constant pressure.

[0029] The packing housing 15 includes a circular cylindrical shell and a circular ring plate. One end of the circular cylindrical shell is connected to the circular ring plate, and the other end of the circular cylindrical shell is connected to the fixed seat 7. The sealing packing 14 is located inside the circular cylindrical shell. Under the action of the compression spring 10, the sealing packing 14 is in close contact with the circular cylindrical shell and the circular ring plate to form a seal.

[0030] The sealing gland 9 is also a structure of a circular cylindrical shell and a circular ring plate. The inner ring surface of the circular ring plate is connected to the outer circular surface of the circular cylindrical shell. The circular ring plate is provided with a through hole, through which a bolt with a hole passes. Positioning and pressure are achieved by the compression spring 10 and the nut.

[0031] The oil drain hole 64 is located at the lower end of the static sealing ring 6, and the oil drain hole 64 is not connected to the annular oil groove 62. As the lubricating grease is worn out, it seeps out from between the dynamic sealing ring 5 and the dynamic and static sealing rings 6. Under the action of gravity, it flows downward, and the waste grease in the upper part falls into the lower part and is finally discharged through the oil drain hole 64. Some waste grease seeps out directly from between the dynamic sealing ring 5 and the dynamic and static sealing rings 6 in the lower part. Both the seeping grease and the discharged grease fall into the oil receiving pan below.

[0032] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications made based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. An energy-saving and environmentally friendly composite sealing device for an acidification kiln, comprising an acidification kiln cylinder and a discharge hood, wherein a sealing mechanism is provided between the two, characterized in that: The sealing mechanism includes a dynamic sealing ring, a static sealing ring, sealing packing, a fixed seat, and a metal expansion joint. The dynamic sealing ring is connected to the acidification kiln shell, and the static sealing ring is connected to the fixed seat. The surface of the static sealing ring is provided with an annular lubricating oil groove, which is connected to the oil supply mechanism through an oil inlet hole, so that a stable oil film is formed between the dynamic sealing ring and the static sealing ring, forming a dynamic sealing layer. The lower end of the fixed seat is provided with a support mechanism. The metal expansion joint is provided between the fixed seat and the discharge hood. A packing shell is provided on the fixed seat, and sealing packing is provided inside the packing shell. A pressure plate fixing plate is provided on the fixed seat, and a sealing pressure plate, a screw, and a compression spring are provided on the pressure plate fixing plate, which can compress the sealing packing.

2. The energy-saving and environmentally friendly composite sealing device for acidification kilns according to claim 1, characterized in that: Cylinders are evenly distributed along the circumference between the fixed seat and the discharge hood. The piston rod of the cylinder is rotatably connected to the fixed seat. The extension and retraction length of the piston rod can adjust the gap between the dynamic sealing ring and the static sealing ring.

3. The energy-saving and environmentally friendly composite sealing device for acidification kilns according to claim 1, characterized in that: The support mechanism includes a frame, an adjusting plate, adjusting bolts, and a support shaft. The two ends of the support shaft are mounted on the adjusting plate via bearing seats. A connecting bolt is provided between the adjusting plate and the frame. The adjusting plate is provided with adjusting bolts, which can adjust the height and tilt angle of the adjusting plate.

4. The energy-saving and environmentally friendly composite sealing device for acidification kilns according to claim 3, characterized in that: The support shafts are two in number and are arranged in parallel and spaced apart. An axial plate is provided at the lower part of the fixed base, and the axial plate is in contact with the support shafts.

5. The energy-saving and environmentally friendly composite sealing device for acidification kilns according to claim 1, characterized in that: The static sealing ring has three annular lubricating oil grooves, which are spaced apart. The oil inlet hole is connected to all three annular lubricating oil grooves. The static sealing ring is also provided with an oil drain hole. The annular lubricating oil grooves are not connected to the oil drain hole, and waste grease is discharged from the oil drain hole.

6. The energy-saving and environmentally friendly composite sealing device for acidification kilns according to claim 1, characterized in that: The dynamic sealing ring and the acidification kiln shell, the static sealing ring and the fixed seat, the fixed seat and the metal expansion joint, and the metal expansion joint and the discharge hood are all connected by screw holes and bolts, respectively.

7. The energy-saving and environmentally friendly composite sealing device for acidification kilns according to claim 1, characterized in that: A guide rod is provided between the discharge hood and the fixed base. One end of the guide rod is connected to the discharge hood by a nut, and the other end of the guide rod is located in the U-shaped groove on the fixed base.

8. A method for energy-saving and environmentally friendly composite sealing of an acidifying kiln using the energy-saving and environmentally friendly composite sealing device according to any one of claims 1-7, comprising the following steps: a. Install the dynamic sealing ring, static sealing ring, sealing packing, fixed seat and metal expansion joint into place, and adjust the height and inclination of the support mechanism to make the dynamic sealing ring and static sealing ring concentric; b. Adjust the extension length of the piston rod of the cylinder to maintain a certain pressure between the dynamic sealing ring and the static sealing ring to ensure reliable contact of the sealing rings. Add lubricating grease through the oil inlet to form a stable oil film between the dynamic sealing ring and the static sealing ring, thus forming a dynamic sealing layer. c. Adjust the sealing gland, screw, and clamping spring so that the sealing packing can squeeze the acidification kiln cylinder to form a seal; d. During normal operation of the acidification kiln, as the temperature of the cylinder rises, the cylinder expands and elongates. The dynamic sealing ring and the static sealing ring move axially with the cylinder. The metal expansion joint absorbs the axial elongation of the cylinder, while the piston rod of the cylinder retracts under the pressure of the cylinder's downward movement. During this process, reliable contact between the dynamic sealing ring and the static sealing ring is always maintained. e. As the temperature of the acidification kiln cylinder stabilizes, the total length of the cylinder no longer changes, and it is in a stable working state.

9. The energy-saving and environmentally friendly composite sealing method for acidification kilns according to claim 8, characterized in that: The acidification kiln cylinder moves axially upwards by 25-30mm and downwards by 25-30mm, reciprocating. The metal expansion joint follows the upward and downward movement of the cylinder, undergoing corresponding elongation and compression changes, and the piston rod of the cylinder extends or retracts accordingly.

10. The energy-saving and environmentally friendly composite sealing method for acidification kilns according to claim 8, characterized in that: The lubricating grease is periodically and quantitatively delivered into the annular lubricating oil tank by an electric dry oil pump, and the waste grease is discharged through the oil drain hole.

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