Macroporous distribution plate supporting skirt

Abstract

The invention discloses a supporting skirt for a macroporous distribution plate. The supporting skirt comprises a cylindrical skirt, a conical skirt, a metal protection layer and a heat insulation layer, the upper end of the cylindrical skirt is connected with the macroporous distribution plate, and the lower end of the cylindrical skirt is connected with the conical skirt; the lower end of the conical skirt is connected with the inner wall of the top of the regenerator barrel; heat insulation layers are arranged inside and outside the skirt; and the heat insulation layer is fixed on the skirt by the metal protection layer. According to the invention, a cylindrical and conical skirt combined structure is adopted, and the conical skirt is rooted on the cylinder at the lower end of the regenerator instead of the transition section of the small cone section of the regenerator, so that the height of the skirt of the macroporous distribution plate is not limited by the height of the cone of the regenerator any more, the required height of the skirt can be conveniently realized, and the temperature gradient of the skirt is small enough; the extrusion and breakage of the wear-resistant nozzles arranged on the pore plate caused by the deformation of the macropore distribution plate due to temperature difference deformation are greatly relieved, the failure of a welding seam at the support skirt is also avoided, meanwhile, the field installation is facilitated, and the installation quality is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of petroleum refining equipment, in particular to a large hole distribution plate support skirt. BACKGROUND

[0002] At present, the core equipment of the catalytic cracking unit in petroleum chemical industry is the reactor and the regenerator, and the large hole distribution plate is the core key component of the regenerator, and its safety reliability directly determines whether the catalytic cracking regeneration process can be carried out smoothly and long-period operation. The large hole distribution plate is arranged at the top of the coke burning tank of the regenerator, which functions to let the completely regenerated or incompletely regenerated catalysts from the coke burning tank to the large hole distribution plate at a certain speed and pressure drop, so that the completely regenerated catalysts enter the subsequent fluidized circulation or the incompletely regenerated catalysts enter the subsequent fluidized circulation after being completely regenerated in the two dense phase cone section.

[0003] The existing large hole distribution plate is usually provided with a certain number of large diameter ceramic wear-resistant nozzles on the flat cover head, the upper end of the support skirt is welded with the lower end of the flat cover head, and the lower end of the support skirt is welded with the small end of the regenerator cone by using the circular arc flexible structure, so as to absorb and coordinate the temperature difference deformation of the catalyst and flue gas in the regenerator, which is 680-750 DEG C to the cold wall design temperature of about 150 DEG C of the regenerator. Because the supporting capacity of the circular arc flexible structure is weak, the temperature change gradient of the support skirt is smaller, and the soft ceramic fiber heat insulation layer is arranged inside and outside the support skirt, in order to avoid the high-speed catalyst and flue gas from hollowing or damaging the soft ceramic fiber, a metal protective layer is arranged on the surface of the soft ceramic fiber inside the support skirt, and the anchor is achieved by using the stud and nut welded inside the support skirt. Although the lower end of the existing support skirt adopts the circular arc flexible structure, and the flexible ceramic fiber heat insulation layer is arranged inside and outside the support skirt to reduce the temperature difference stress and relieve and absorb the deformation. But due to the height of the regenerator cone and the process bed layer, the support skirt of the large hole distribution plate cannot be long enough. At the same time, the circular arc transition area at the lower end of the support skirt of the large hole distribution plate is a three-dimensional structure, and it is very difficult to fill the soft ceramic fiber and form and install the metal protective layer on its surface, so the on-site safety and quality cannot be ensured. Therefore, after the existing large hole distribution plate is operated for a period of time, the wall temperature of the welding position between the circular arc flexible structure at the lower end of the support skirt and the small end of the regenerator cone exceeds the design temperature, and even the welding seam between the circular arc flexible structure and the small section of the regenerator cone is torn and fails. SUMMARY

[0004] The application provides a large-hole distribution plate supporting skirt, which solves the problems of insufficient supporting capacity of the flexible structure of the lower end of the existing large-hole distribution plate, insufficient height of the supporting skirt, and difficult installation of the soft ceramic fiber felt metal protective layer inside the supporting skirt by adopting the structure of a cylinder + a conical skirt.

[0005] The technical scheme adopted by the application is as follows: a large-hole distribution plate supporting skirt, which comprises a cylindrical skirt, a conical skirt, a metal protective layer and a heat insulation layer; the cylindrical skirt is equal in diameter to the large-hole distribution plate, the upper end of the cylindrical skirt is connected with the large-hole distribution plate, and the lower end of the cylindrical skirt is connected with the conical skirt; the lower end of the conical skirt is connected with the inner wall of the top of the regenerator cylinder; the heat insulation layer is arranged on the inner and outer sides of the skirt; and the metal protective layer is used to fix the heat insulation layer on the skirt.

[0006] Preferably, the half vertex angle of the small end of the conical skirt is less than or equal to 60 degrees.

[0007] Preferably, the small end of the conical skirt is provided with a circular arc folded edge transition, and the transition radius is greater than or equal to 0.05 times the diameter of the small end of the conical skirt.

[0008] Preferably, the distance between the outer diameter of the large end of the conical skirt and the inner diameter of the lower end of the regenerator cylinder is 2mm to 4mm.

[0009] Preferably, the heat insulation layer material on the outer side of the skirt is flexible ceramic fiber cotton, which is filled and compacted, and the compression ratio is 1.5 to 2.

[0010] Preferably, the heat insulation layer material on the inner side of the skirt is flexible ceramic fiber felt, which is 100mm to 200mm in thickness and wrapped with 1 to 3 layers of stainless steel wire mesh.

[0011] Preferably, the metal protective layer comprises a cylindrical metal protective layer and a conical metal protective layer, the cylindrical metal protective layer is arranged on the inner side of the flexible ceramic fiber felt, the upper end of the cylindrical metal protective layer is folded into a horizontal plate and is sealingly connected with the cylindrical skirt, the half vertex angle of the small end of the conical metal protective layer is the same as that of the small end of the conical skirt, the small end of the conical metal protective layer is provided with a circular arc folded edge transition, and the transition radius is greater than or equal to 0.05 times the diameter of the small end of the conical metal protective layer, and the large end of the conical metal protective layer is connected with the inner wall of the lower end of the regenerator cylinder.

[0012] Preferably, the vertical section of the cylindrical metal protective layer is provided with a ring-shaped long circular hole with a length of 150mm to 300mm in the height direction and the circumferential direction, the tangent position of the folded edge of the small end of the conical metal protective layer is also provided with a circular hole with a length of 150mm to 300mm at intervals in the circumferential direction, and the long circular hole in the corresponding position of the conical metal protective layer and the cylindrical metal protective layer is connected through a hexagonal head bolt, a large gasket and a nut.

[0013] Preferably, the S30409 steel plate with a cylindrical metal protective layer has a thickness of 1mm-3mm, and the S30409 steel plate with a conical metal protective layer has a thickness of 6mm-16mm.

[0014] Preferably, the inner wall of the cylindrical skirt is welded with studs at intervals of 150mm-300mm in the height direction and the circumferential direction, and the studs are connected with large washers and nuts after penetrating through the long circular holes at the corresponding positions of the outer metal protective layer of the cylindrical skirt. Preferably, the hexagonal head bolts and studs have specifications of M8-M16, and the nuts should be matched with the hexagonal head bolts and studs; the outer diameter of the large washer should be able to cover the circumferential long circular hole on the cylindrical metal protective layer, and the relevant material is S30409.

[0015] The beneficial effects of the present application are as follows:

[0016] 1. The present application adopts a combined structure of a cylindrical skirt and a conical skirt, and the conical skirt is rooted on the lower end cylinder of the regenerator instead of being rooted on the small transition section of the conical body of the regenerator, so that the height of the skirt of the large-hole distribution plate is no longer restricted by the height of the conical body of the regenerator, and the height of the skirt required for absorbing the temperature difference stress can be easily realized, so that the temperature gradient is small enough, and the deformation of the large-hole distribution plate caused by the temperature difference deformation is greatly relieved, and the wear-resistant nozzles arranged on the hole plate are prevented from being extruded and broken, and the possibility of weld failure at the supporting skirt is also avoided.

[0017] 2. The lower end of the large-hole distribution plate utilizes the excellent supporting capacity of the conical body, and greatly improves the problem of insufficient support of the original circular-arc flexible support skirt.

[0018] 3. The present application adopts a combined structure of a cylindrical skirt and a conical skirt, and the conical skirt is rooted on the lower end cylinder of the regenerator, so that the structure is more regular and smooth than the original technical structure, and is easy to install on site.

[0019] 4. The large-hole distribution plate support skirt of the present application is wrapped with a stainless steel wire mesh and then wrapped with a flexible ceramic fiber felt, which is more resistant to and prevents high-temperature flue gas from being hollowed out.

[0020] 5. The inner side of the large-hole distribution plate support skirt of the present application adopts a structure of a cylindrical skirt + a bottom conical metal protective layer + a bolt-nut-washer structure, which is easy to install on site and has more reliable installation quality, and does not have the problem of difficult installation of space stereo structure on site. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a schematic view of the connecting structure of the present application;

[0022] Figure 2 is a schematic view of the structure of the present application;

[0023] In the figure: 1, cylindrical skirt; 2, conical skirt; 3, large hole distribution plate; 4, lower end cylinder of regenerator; 5, flexible ceramic fiber cotton; 6, flexible ceramic fiber felt; 7, cylindrical metal protective layer; 8, conical metal protective layer; 9, stud; 10, nut; 11, large washer; 12, hexagonal head bolt; 13, stainless steel wire mesh. DETAILED DESCRIPTION

[0024] The application will be further described in detail below with reference to the accompanying drawings and specific embodiments, and the specific embodiments do not limit the scope of the application claimed.

[0025] As shown in Figure 1 , Figure 2 , the technical solution adopted by the application is: a large hole distribution plate support skirt, comprising a cylindrical skirt 1, a conical skirt 2, a metal protective layer and a heat insulation layer; the cylindrical skirt 1 is equal in diameter to the large hole distribution plate 3, the upper end of the cylindrical skirt 1 is connected to the large hole distribution plate 3, and the lower end of the cylindrical skirt 1 is connected to the conical skirt 2; the lower end of the conical skirt 2 is connected to the inner wall of the lower end cylinder 4 of the regenerator; the heat insulation layer is arranged on the inner and outer sides of the skirt; and the metal protective layer fixes the heat insulation layer on the skirt.

[0026] The small end of the conical skirt 2 adopts a circular arc folded edge transition, the transition radius is 0.05 times the diameter of the small end of the conical skirt 2, the small end half vertex angle of the conical skirt 2 is 60°, and the distance between the outer diameter of the large end of the conical skirt 2 and the inner diameter of the lower end cylinder 4 of the regenerator is 2mm.

[0027] The heat insulation layer material on the outer side of the skirt is flexible ceramic fiber cotton 5, the flexible ceramic fiber cotton 5 is filled and compacted, and the compression ratio is 2. The heat insulation layer material on the inner side of the skirt is flexible ceramic fiber felt 6, and the thickness of the flexible ceramic fiber felt 6 is 150mm.

[0028] The metal protective layer comprises a cylindrical metal protective layer 7 and a conical metal protective layer 8, the cylindrical metal protective layer 7 is arranged on the inner side of the flexible ceramic fiber felt 6, the upper end of the cylindrical metal protective layer 7 is folded into a horizontal plate and is sealingly connected to the cylindrical skirt 1; the small end half vertex angle of the conical metal protective layer 8 is the same as that of the small end of the conical skirt 2; the small end of the conical metal protective layer 8 adopts a circular arc folded edge transition, the transition radius is 0.05 times the diameter of the small end of the conical metal protective layer 8; and the large end of the conical metal protective layer 8 is connected to the inner wall of the lower end cylinder 4 of the regenerator.

[0029] The vertical section of the cylindrical metal protective layer 7 is provided with long circular holes with a length of 250mm in the height direction and the circumferential direction; the tangent position of the folded edge of the small end of the conical metal protective layer is also provided with long circular holes with a length of 250mm at intervals in the circumferential direction, and the long circular holes at the corresponding positions of the conical metal protective layer and the cylindrical metal protective layer are connected through studs 9 or hexagonal head bolts 12, nuts 10 and large washers 11.

[0030] The flexible ceramic fiber felt 6 is wrapped with two layers of stainless steel wire mesh 13, the cylindrical metal protective layer is made of S30409 steel plate with a thickness of 2 mm, and the conical metal protective layer is made of S30409 steel plate with a thickness of 12 mm.

[0031] Preferably, the inner wall of the cylindrical skirt 1 is welded with welding studs 9 at an interval of 250 mm along the height direction, and the positioning of the studs in the circumferential direction of the inner wall of the cylindrical skirt 1 should be projected radially to the welded studs 9 on the inner wall of the cylindrical skirt 1 using the corresponding long circular hole positions on the cylindrical metal protective layer 7 as the positioning points, and then connected with large washers 11 and nuts 10. The hexagonal head bolts 12 are fixed firmly after being passed through the corresponding circular holes of the conical metal protective layer 8 and the circular hole positions on the cylindrical metal protective layer 7, and then connected with large washers 11 and nuts 10.

[0032] The above is only a typical example of the present application, and does not limit the present application in any form. Any skilled person in the art can make changes or modifications to the above technical content without departing from the scope of the technical solution of the present application, and such changes or modifications shall be regarded as equivalent examples. Any equivalent changes made to the above examples according to the technical essence of the present application without departing from the technical solution of the present application shall be regarded as within the scope of the present application.

Claims

1. A large-hole distribution plate support skirt base, characterized in that: It includes a cylindrical skirt, a conical skirt, a metal protective layer, and a heat insulation layer; the cylindrical skirt has the same diameter as the large-hole distribution plate, the upper end of the cylindrical skirt is connected to the large-hole distribution plate, and the lower end of the cylindrical skirt is connected to the conical skirt; the lower end of the conical skirt is connected to the inner wall of the top of the regenerator cylinder; heat insulation layers are provided on both the inner and outer sides of the skirt; the metal protective layer fixes the heat insulation layer to the skirt.

2. The large-hole distribution plate support skirt according to claim 1, characterized in that: The small end semi-apex angle of the conical skirt base is ≤60°.

3. The large-hole distribution plate support skirt according to claim 1, characterized in that: The small end of the conical skirt base adopts a rounded edge transition, with a transition radius ≥ 0.05 times the small end diameter of the conical skirt base.

4. The large-hole distribution plate support skirt according to claim 1, characterized in that: The distance between the outer diameter of the large end of the conical skirt and the inner diameter of the lower end of the regenerator cylinder is 2mm to 4mm.

5. The large-hole distribution plate support skirt according to claim 1, characterized in that: The outer insulation layer of the skirt is made of flexible ceramic fiber cotton, which is filled and compacted with a compression ratio of 1.5 to 2.

6. The large-hole distribution plate support skirt according to claim 1, characterized in that: The inner insulation layer of the skirt is made of flexible ceramic fiber felt, which is 100mm to 200mm thick and wrapped with 1 to 3 layers of stainless steel wire mesh.

7. The large-hole distribution plate support skirt according to claim 1, characterized in that: The metal protective layer includes a cylindrical metal protective layer and a conical metal protective layer. The cylindrical metal protective layer is located inside the heat insulation layer. The upper edge of the cylindrical metal protective layer is a horizontal plate and is sealed to the cylindrical skirt. The half-apex angle of the small end of the conical metal protective layer is the same as the half-apex angle of the small end of the conical skirt. The small end of the conical metal protective layer adopts a rounded edge transition, and its transition radius is ≥0.05 times the diameter of the small end of the conical metal protective layer. The large end of the conical metal protective layer is connected to the inner wall of the lower cylinder of the regenerator.

8. The large-hole distribution plate support skirt according to claim 7, characterized in that: The cylindrical metal protective layer has circumferential elongated holes of 150mm to 300mm in both the vertical and circumferential directions. The conical metal protective layer also has circular holes of 150mm to 300mm spacing along the circumferential direction at the tangent of the flange at the small end. The conical metal protective layer and the cylindrical metal protective layer are connected by hexagonal head bolts, large washers, and nuts.

9. The large-hole distribution plate support skirt according to claim 7, characterized in that: S30409 steel plates with cylindrical metal protective layer thickness of 1mm to 3mm and conical metal protective layer thickness of 6mm to 16mm.

10. The large-hole distribution plate support skirt according to claim 8, characterized in that: The inner wall of the cylindrical skirt is welded with studs spaced 150mm to 300mm apart along both the height and circumference directions. The studs pass through the corresponding elongated holes on the outer metal protective layer of the cylindrical skirt and are then connected with large washers and nuts.

11. The large-hole distribution plate support skirt according to claim 10, characterized in that: Hex head bolts and studs are available in sizes from M8 to M16. Nuts should be matched with hex head bolts and studs. The outer diameter of the large washer covers the circumferential elongated hole on the cylindrical metal protective layer.

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