CN210473926U - Medium distribution device and fluidized bed reactor - Google Patents
Medium distribution device and fluidized bed reactor Download PDFInfo
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- CN210473926U CN210473926U CN201920525611.6U CN201920525611U CN210473926U CN 210473926 U CN210473926 U CN 210473926U CN 201920525611 U CN201920525611 U CN 201920525611U CN 210473926 U CN210473926 U CN 210473926U
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Abstract
The utility model discloses a medium distribution device and fluidized bed reactor belongs to petrochemical technical field. When the medium distribution device provided by the application is used, the medium distribution device is fixed in the fluidized bed reactor. When the medium passes through the medium distribution device provided by the application, the distance from the airflow outlet of the sieve holes of the distribution plate to the upper surface of the distribution plate is prolonged due to the nozzles additionally arranged on the sieve holes of the distribution plate. Therefore, after the high-speed airflow passes through the sieve holes of the distribution plate, the catalyst carried by airflow vortexes formed by the medium at the outlet of the nozzle and the catalyst carried by vortexes formed by the medium in the catalyst bed layer only abrade the nozzle, so that the direct contact with the upper surface of the distribution plate is avoided, and the abrasion of the distribution plate is avoided. The nozzle has simple structure and convenient replacement, is suitable for different distribution plate types such as flat plates, concave spherical surfaces and the like, and can meet the long-period operation requirement of the device. Only the nozzle with serious abrasion or damage needs to be replaced in the inspection and maintenance process, so that the maintenance cost of the equipment is saved.
Description
Technical Field
The utility model relates to a petrochemical technical field, in particular to medium distribution device and fluidized bed reactor.
Background
In fluidized bed reactors used in the petrochemical industry (such as reactors and regenerators in catalytic cracking units, and MTO (methanol to olefin) units), a medium distribution device is widely used to ensure uniform distribution of a medium in the fluidized bed reactor.
In the related art, as shown in fig. 1, a fluidized bed reactor includes a housing 01, a medium distribution device 02, and a catalyst bed 03. The shell 01 is a cylindrical structure, a medium inlet 04 is arranged at the first end of the shell 01, a medium outlet is arranged at the second end of the shell 01, and the medium distribution device 02 is positioned in the shell 01 and is close to the medium inlet 04. A catalyst bed 03 is located in the housing 01 and the catalyst bed 03 is located in the upper part of the media distribution means. As shown in fig. 2, the medium distribution device 02 has a plate-shaped structure, and a plurality of screen holes are formed on the medium distribution device 02. The catalyst bed 03 is formed by catalyst in the form of pellets deposited on the media distribution means 02. When a fluidized bed reactor is used, the medium enters the shell through the medium inlet at a certain flow rate, and the medium contacts with the catalyst in the catalyst bed after passing through the sieve holes on the medium distribution device. Wherein the media distribution device may also be referred to as a distribution plate within the regenerator.
Since in the related art, the high-speed air streams ejected from the plurality of screen holes in the medium distribution device swirl around the screen holes, abrasion is caused to the surface around the screen holes of the medium distribution device. And the catalyst particles in the catalyst bed layer can form vortex under the action of the medium, so that the surface of the medium distribution device is abraded. For example, in the process of maintenance in many refineries, it is commonly found that there is severe abrasion around and on the surface of the sieve holes of the distribution plate in the regenerator, which causes uneven distribution of the medium and directly affects the regeneration effect and long-term operation of the regenerator. And when the sieve holes in the upper surface of the medium distribution device and other positions are seriously abraded by the catalyst, the medium distribution device needs to be replaced, which affects the service life of the distribution device and increases the workload and cost of device inspection and maintenance.
SUMMERY OF THE UTILITY MODEL
The utility model provides a medium distribution device and fluidized bed reactor for in the fluidized bed solves the distribution plate sieve mesh that causes by the high velocity air and around and the abrasion problem on whole surface. The distribution plate is ensured to meet the requirement of long-period operation of the device. The technical scheme is as follows:
in a first aspect, a media distribution device is provided, where the structure includes a distribution plate and N nozzles, where N is a positive integer greater than 1;
m sieve holes are formed in the distribution plate, M is a positive integer larger than 1, and M is larger than or equal to N;
each nozzle in the N nozzles corresponds to a sieve pore, the first end of each nozzle in the N nozzles is positioned at the corresponding sieve pore, the second end of each nozzle in the N nozzles is contacted with the catalyst bed layer in the fluidized bed reactor, each nozzle in the N nozzles is communicated with the corresponding sieve pore so that a medium can be contacted with the catalyst bed layer after passing through each sieve pore and the corresponding nozzle, and the medium distribution device is fixed in the fluidized bed reactor.
Optionally, the nozzle is of a tubular construction of uniform internal diameter.
Optionally, the first end of each nozzle of the N nozzles is welded to a corresponding mesh in the upper surface of the distribution plate, which is the surface of the distribution plate that contacts the catalyst bed when the media distribution device is secured in the fluidized bed reactor.
Optionally, the first end of each of the N nozzles is nested within a corresponding mesh aperture.
Optionally, the first end of each of the N nozzles is fixed to the upper surface and the lower surface of the corresponding sieve pore by welding.
Optionally, the distance between the second end of each nozzle and the upper surface of the distribution plate is 10-500 mm.
Optionally, each of the N nozzles has an inner diameter of 1-50 mm.
Optionally, the mesh size of each of the M mesh openings is 1-30 mm.
Optionally, the side of the distribution plate is in contact with an inner wall of the housing of the fluidized bed reactor.
In a second aspect, there is provided a fluidized bed reactor comprising a housing, a media distribution device of any of the first aspects, and a catalyst bed;
the shell is of a cylinder structure, a first end of the shell is provided with a medium inlet, and a second end of the shell is provided with a medium outlet;
the medium distribution device is positioned in the shell and close to the medium inlet, and the catalyst bed layer is positioned in the shell and between the medium distribution device and the medium outlet.
The utility model provides a technical scheme's beneficial effect is:
when using the utility model provides a medium distribution device, fix medium distribution device in fluidized bed reactor. When the medium passes through the utility model provides a during medium distribution device, because the nozzle that increases on the distributing plate sieve mesh, prolonged the distance of distributing plate sieve mesh air outlet apart from the distributing plate upper surface. Therefore, after the high-speed airflow passes through the sieve holes of the distribution plate, the catalyst carried by airflow vortexes formed by the medium at the outlet of the nozzle and the catalyst carried by vortexes formed by the medium in the catalyst bed layer only abrade the nozzle, so that the direct contact with the upper surface of the distribution plate is avoided, and the abrasion of the distribution plate is avoided. The nozzle has simple structure and convenient replacement, is suitable for different distribution plate types such as flat plates, concave spherical surfaces and the like, and can meet the long-period operation requirement of the device. Only the nozzle which is seriously abraded or damaged needs to be replaced in the inspection and maintenance process, so that the equipment maintenance cost is saved, and the benefit is improved.
Drawings
FIG. 1 is a schematic view of a fluidized bed reactor provided in the related art;
FIG. 2 is a schematic diagram of a media distribution device provided in the related art;
fig. 3 is a schematic structural diagram of a medium distribution device according to an embodiment of the present invention;
fig. 4 is a schematic view of a nozzle fixed at a corresponding sieve hole according to an embodiment of the present invention;
fig. 5 is a schematic view of another nozzle according to an embodiment of the present invention being fixed to a corresponding screen hole;
fig. 6 is a schematic structural diagram of a distribution board according to an embodiment of the present invention.
Reference numerals:
01: a housing; 02: a media distribution device; 03: a catalyst bed layer; 04: a media inlet;
1: a distribution plate; 2: a nozzle; 3: and (4) screening holes.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Fig. 3 is a schematic structural diagram of a medium distribution device according to an embodiment of the present invention. As shown in fig. 3, the apparatus includes: the nozzle comprises a distribution plate 1 and N nozzles 2, wherein N is a positive integer greater than 1.
When using the utility model provides a medium distribution device, fix medium distribution device in fluidized bed reactor. When the medium passes through the utility model provides a during medium distribution device, because the nozzle that increases on the distributing plate sieve mesh, prolonged the distance of distributing plate sieve mesh air outlet apart from the distributing plate upper surface. Therefore, after the high-speed airflow passes through the sieve holes of the distribution plate, the catalyst carried by airflow vortexes formed by the medium at the outlet of the nozzle and the catalyst carried by vortexes formed by the medium in the catalyst bed layer only abrade the nozzle, so that the direct contact with the upper surface of the distribution plate is avoided, and the abrasion of the distribution plate is avoided. The nozzle has simple structure and convenient replacement, is suitable for different distribution plate types such as flat plates, concave spherical surfaces and the like, and can meet the long-period operation requirement of the device. Only the nozzle which is seriously abraded or damaged needs to be replaced in the inspection and maintenance process, so that the equipment maintenance cost is saved, and the benefit is improved.
It should be noted that, to the medium distribution device provided by the embodiment of the present invention, the existing medium distribution device can be improved, so that the structure of the existing medium distribution device is the same as the structure of the medium distribution device provided by the present invention.
In addition, after the media distribution device provided by the present invention is fixed in the catalyst reactor, the catalyst in the catalyst reactor will abrade the nozzles 2 on the distribution plate, the nozzles 2 being the channels through which the media contacts the catalyst. The tubular nozzle with uniform inner diameter has simple structure, and can ensure long service life of the distribution device and proper medium pressure drop. For the above reasons, each nozzle 2 of the distribution plate has a tubular structure with a uniform inner diameter.
In addition, the first end of each nozzle 2 in the nozzles 2 is located at the corresponding sieve hole 3, and the following two ways can be realized:
(1) as shown in fig. 4, the first end of each of the nozzles 2 is welded to the corresponding mesh 3 in the upper surface of the distribution plate 1, which is the surface of the distribution plate 1 that contacts the catalyst bed when the media distribution plate is fixed in the fluidized bed reactor, of the distribution plate 1.
(2) The first end of each of the nozzles 2 is nested within a corresponding mesh 3.
The first end of each nozzle 2 is nested in the corresponding sieve pore 3 in the following manner: as shown in fig. 5, the first end of each of the nozzles 2 is fixed to the upper and lower surfaces of the corresponding screen hole 3 by welding.
Of course, besides the above two fixing manners, there may be other fixing manners for fixing the first end of the nozzle 2 to the corresponding sieve hole 3, and the embodiment of the present invention is not limited herein.
In addition, in order to ensure that the gas stream outlets are spaced a suitable distance from the surface of the distribution plate and that there is a suitable pressure drop across the distribution plate when the medium passes through the medium distribution device, the distance between the second end of each nozzle 3 and the upper surface of the distribution plate 1 may be in the range 10-500 mm.
In addition, in order to ensure that the medium can be uniformly divided by the distribution plate so that the medium is uniformly contacted with the catalyst in the catalyst bed when the medium passes through the medium distribution device and that the medium has a suitable pressure drop after passing through the medium distribution device, the inner diameter of each nozzle 2 of the N nozzles 2 may be 1 to 50mm, and the pore diameter of each sieve mesh 3 of the M sieve meshes 3 may be 1 to 30 mm.
In addition, in practical use the utility model provides a during medium distribution device, can only follow M sieve meshes in the distribution plate 1 and flow through in N nozzle 2 in order to ensure the medium for the contact of medium and catalyst is comparatively abundant, and consequently, the side of distribution plate 1 and the interior wall connection of the casing of catalyst reactor
Wherein the distribution plate 1 may be welded in the inner wall of the housing of the fluidized bed reactor.
It should be noted that, in the present invention, the surface of the distribution plate 1 may be a flat surface, or as shown in fig. 6, the surface of the distribution plate 1 may be a concave surface. Of course, the surface of the distribution plate may be in other forms, and the present invention is not limited thereto.
When using the utility model provides a medium distribution device, fix medium distribution device in fluidized bed reactor. When the medium passes through the utility model provides a during medium distribution device, because the nozzle that increases on the distributing plate sieve mesh, prolonged the distance of distributing plate sieve mesh air outlet apart from the distributing plate upper surface. Therefore, after the high-speed airflow passes through the sieve holes of the distribution plate, the catalyst carried by airflow vortexes formed by the medium at the outlet of the nozzle and the catalyst carried by vortexes formed by the medium in the catalyst bed layer only abrade the nozzle, so that the direct contact with the upper surface of the distribution plate is avoided, and the abrasion of the distribution plate is avoided. The nozzle has simple structure and convenient replacement, is suitable for different distribution plate types such as flat plates, concave spherical surfaces and the like, and can meet the long-period operation requirement of the device. Only the nozzle which is seriously abraded or damaged needs to be replaced in the inspection and maintenance process, so that the equipment maintenance cost is saved, and the benefit is improved.
The embodiment of the utility model provides a fluidized bed reactor. The fluidized bed reactor comprises a medium distribution device, a catalyst bed layer and a shell, which are provided by the utility model;
the shell is of a cylinder structure, a medium inlet is arranged at the first end of the shell, and a medium outlet is arranged at the second end of the shell;
the medium distribution plate is positioned in the shell and close to the medium inlet, and the catalyst bed layer is positioned in the shell and between the medium distribution device and the medium outlet.
The following is a detailed description of the method for using the fluidized bed reactor provided by the embodiment of the present invention:
when the fluidized bed reactor provided by the embodiment of the utility model is used, a medium enters the shell through the medium inlet, and the medium is in contact with the distribution plate. Because the sieve holes are formed on the distribution plate, the medium can continuously move in the shell through the sieve holes. After the medium passes through the sieve holes and nozzles on the distribution plate, the medium contacts with the catalyst in the catalyst bed.
Typically, the medium will have a certain flow rate when entering the housing through the medium inlet. Therefore, after the medium passes through each sieve hole in the sieve holes of the distribution plate and the nozzle, the medium with the flow velocity can drive the catalyst in the catalyst bed layer, so that the catalyst flows along with the medium.
To sum up, the preferred embodiment of the present invention is only, not intended to limit the present invention, any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A media distribution device, comprising a distribution plate (1), N nozzles (2), N being a positive integer greater than 1;
m sieve holes (3) are formed in the distribution plate (1), M is a positive integer greater than 1, and M is greater than or equal to N;
each nozzle (2) in the N nozzles (2) corresponds to a sieve mesh (3), the first end of each nozzle (2) in the N nozzles (2) is positioned at the corresponding sieve mesh (3), the second end of each nozzle (2) in the N nozzles (2) is contacted with a catalyst bed layer in the fluidized bed reactor, each nozzle (2) in the N nozzles (2) is communicated with the corresponding sieve mesh (3) so that a medium can be contacted with the catalyst bed layer after passing through each sieve mesh (3) and the corresponding nozzle (2), and the medium distribution device is fixed in the fluidized bed reactor.
2. The media distribution device according to claim 1, wherein the nozzles (2) are of a tubular construction with a uniform internal diameter.
3. The media distribution device according to claim 1, wherein the first end of each nozzle (2) of the N nozzles (2) is welded to a corresponding mesh (3) in the upper surface of the distribution plate (1), the upper surface of the distribution plate (1) being the surface of the distribution plate (1) that is in contact with the catalyst bed when the media distribution device is fixed in the fluidized bed reactor.
4. The media distribution arrangement according to claim 1, wherein the first end of each nozzle (2) of the N nozzles (2) is nested within a corresponding screen aperture (3).
5. The media distribution arrangement according to claim 4, wherein the first end of each nozzle (2) of the N nozzles (2) is fixed to the upper and lower surface of the corresponding screen opening (3) by welding.
6. A media distribution arrangement according to any of claims 3 to 5, wherein the distance between the second end of each nozzle (2) and the upper surface of the distribution plate (1) is 10-500 mm.
7. A medium distribution device according to claim 1, wherein the inner diameter of each nozzle (2) of the N nozzles (2) is 1-50 mm.
8. The media distribution arrangement according to claim 1, wherein the pore size of each mesh (3) of the M meshes (3) is 1-30 mm.
9. The media distribution arrangement according to claim 1, wherein the distribution plate (1) is connected to an inner wall of the housing of the fluidized bed reactor.
10. A fluidized bed reactor comprising a housing, a media distribution device of any one of claims 1 to 9, and a catalyst bed;
the shell is of a cylinder structure, a first end of the shell is provided with a medium inlet, and a second end of the shell is provided with a medium outlet;
the medium distribution device is positioned in the shell and close to the medium inlet, and the catalyst bed layer is positioned in the shell and between the medium distribution device and the medium outlet.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920525611.6U CN210473926U (en) | 2019-04-17 | 2019-04-17 | Medium distribution device and fluidized bed reactor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920525611.6U CN210473926U (en) | 2019-04-17 | 2019-04-17 | Medium distribution device and fluidized bed reactor |
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| CN210473926U true CN210473926U (en) | 2020-05-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113522175A (en) * | 2021-08-19 | 2021-10-22 | 江西全兴化工填料有限公司 | Liquid distribution device of chemical packed tower |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113522175A (en) * | 2021-08-19 | 2021-10-22 | 江西全兴化工填料有限公司 | Liquid distribution device of chemical packed tower |
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