CN219252550U

CN219252550U - Regenerated air average distributor of catalytic cracking device

Info

Publication number: CN219252550U
Application number: CN202320803539.5U
Authority: CN
Inventors: 王宗宇; 路德明; 许兆广; 刘超
Original assignee: Shandong Qilu Petrochemical Engineering Co ltd
Current assignee: Shandong Qilu Petrochemical Engineering Co ltd
Priority date: 2023-04-12
Filing date: 2023-04-12
Publication date: 2023-06-27
Anticipated expiration: 2033-04-12

Abstract

The utility model relates to the technical field of catalytic cracking devices, in particular to a regenerated air average distributor of a catalytic cracking device. The regenerated air average distributor of the catalytic cracking device comprises a Y-shaped tee joint, a first-stage concentric reducing pipe, a first-stage rectifying grid and an intermediate rectifying grid, wherein one end of the Y-shaped tee joint is connected with the first-stage tee joint through the first-stage concentric reducing pipe, the first-stage tee joint is connected with the first-stage rectifying grid through a first-stage steel pipe, and the first-stage tee joint is connected with the intermediate rectifying grid through a first-stage connecting pipe. One end of the Y-shaped tee joint is connected with a secondary concentric reducing pipe, and the secondary concentric reducing pipe is connected with a secondary tee joint. The regeneration air average distributor has the advantages of good regeneration air distribution effect, small occupied area, simple processing and manufacturing, convenient operation and maintenance, and the like.

Description

Regenerated air average distributor of catalytic cracking device

Technical Field

The utility model relates to the technical field of catalytic cracking devices, in particular to a regenerated air average distributor of a catalytic cracking device.

Background

The regenerator is used as an important component of a catalytic cracking unit reaction regeneration system, and provides a place and a burning condition for catalyst regeneration. The main conditions for removing carbon from the catalyst surface are temperature and oxygen content, with blower blowing into the regenerator being the most common way at present. The uniformity of air blown into the regenerator not only affects the quality of the regeneration and the burning process, but also directly affects the fluidization and loss of the catalyst in the regenerator.

The number of air inlets of the lower end socket of the regenerator of the catalytic cracking device in the prior scale at home is two, the pipelines are easy to realize symmetrical arrangement, and the regenerated air quantity can be uniformly distributed to the two inlets. In recent years, as the scale of the apparatus increases, the size of the apparatus increases, and in order to achieve fluidization of the catalyst and uniform distribution of oxygen content in the regenerator, the air inlet of the regenerator bottom head is increased to three ports, and at this time, it is difficult for the normal piping to achieve uniform distribution of air. The lower space of the regenerator head is limited in the vertical and horizontal directions due to the influence of a plurality of factors such as process and engineering realization, and the uniform distribution of air quantity of a large-caliber air pipeline is difficult to realize in the conventional piping mode. Uneven air distribution will severely affect the fluidization state and regeneration effect of the catalyst inside the regenerator.

Disclosure of Invention

According to the defects in the prior art, the utility model aims to provide the regenerated air average distributor of the catalytic cracking device, which has the advantages of good regenerated air distribution effect, small occupied area, simple processing and manufacturing, convenient operation and maintenance and the like.

The utility model is realized by adopting the following technical scheme:

the regenerated air average distributor of the catalytic cracking device comprises a Y-shaped tee joint, a first-stage concentric reducing pipe, a first-stage rectifying grid and an intermediate rectifying grid, wherein one end of the Y-shaped tee joint is connected with the first-stage tee joint through the first-stage concentric reducing pipe, the first-stage tee joint is connected with the first-stage rectifying grid through a first-stage steel pipe, and the first-stage tee joint is connected with the intermediate rectifying grid through a first-stage connecting pipe. The rectifying grid is used for adjusting the flow pattern to enable the airflow to advance along the pipeline, so that the airflow is prevented from flowing to the abrupt change position to cause the vibration and the pressure drop increase of the distributor.

One end of the Y-shaped tee joint is connected with a secondary concentric reducing pipe, and the secondary concentric reducing pipe is connected with a secondary tee joint.

One end of the secondary tee is connected with a secondary rectifying grid through a secondary steel pipe, a secondary flange is connected to the secondary rectifying grid, and a secondary air outlet is formed in the secondary rectifying grid.

One end of the second-stage tee is connected with an intermediate rectifying grid through a second-stage connecting pipe, and an intermediate air outlet is formed in the intermediate rectifying grid.

The primary rectifying grid is connected with a primary flange, and a primary air outlet 16 is arranged on the primary rectifying grid 6. The flange is used for sealing the end head of the regeneration air average distributor. The flange is a lined flange.

The primary connecting pipe and the middle rectifying grid form 120 degrees.

The secondary connecting pipe and the middle rectifying grid are 120 degrees.

The inner sides of the Y-shaped tee joint, the primary concentric reducing pipe, the primary tee joint, the primary steel pipe primary rectifying grid, the secondary concentric reducing pipe, the secondary tee joint, the secondary steel pipe, the secondary rectifying grid, the middle rectifying grid, the primary connecting pipe and the secondary connecting pipe are respectively provided with a single-layer wear-resistant heat insulation lining.

The working principle of the utility model is as follows:

the distributor is made of carbon steel, the air main pipe from the starting heating furnace is divided into two paths through a Y-shaped tee joint, and the two paths are distributed again through the tee joint after the diameter of the concentric reducing pipe is reduced and rectified. The airflow outlet plane is provided with a rectifying grid at the advancing position of the vertical pipe direction, the rectifying grid adjusts the flow pattern to enable the airflow to advance along the pipeline, the flow pattern disorder of the airflow flowing to the abrupt position is prevented, and the vibration and the pressure drop of the distributor are increased. The air flows out through three outlets of the distributor after rectification, and the three outlets are directly connected with three air inlets at the bottom of the regenerator. Because the whole distributor is arranged at the same horizontal elevation, the space in the vertical direction is greatly saved, and the space requirement of the air pipeline vertical pipe for arranging the expansion joint and the limiting pipe frame can be met. In the distributor, besides the Y-shaped tee joint and the rectifier grid are specially manufactured, other parts are welded by assembling standard pipe fittings and steel pipes, and the manufacturing cost is controlled.

The inside of the distributor is provided with a single-layer wear-resistant heat-insulating lining, the thickness of the lining is generally 100mm, and the C-level single-layer wear-resistant heat-insulating lining in GB 50474 standard is adopted, and the thickness is adjusted according to the conditions of the climate and the like of the place where the project is located. And lining flanges are arranged at two ends of the distributor and are used for construction and later maintenance of the wear-resistant heat-insulating lining of the distributor. The flange cover is provided with a rotating arm and a lifting hook, so that the flange cover is convenient to detach. The rectification grid is connected with the distributor through bolts, so that the maintenance is convenient.

The regenerated air average distributor of the catalytic cracking device adopts Fluent fluid simulation software to simulate the complex flow of air in the distributor, the data input by simulation calculation is the actual operation condition data of the air inlet at the bottom of the regenerator of a catalytic cracking device, and the calculation result of finite element analysis software verifies that the regenerated air flow in three outlet pipes of the distributor is relatively close. The utility model has ideal effect on the distribution of the regenerated air, is suitable for the working condition of three inlets at the bottom of the regenerator of the catalytic cracking device, and achieves the expected effect.

Compared with the prior art, the utility model has the beneficial effects that:

by adopting the regenerated air average distributor of the catalytic cracking device, the regenerated air average distributor has the advantages of good regenerated air distribution effect, small occupied area, simple processing and manufacturing, convenient operation and maintenance and the like through the matching arrangement of the Y-shaped tee joint and the rectification grid.

Drawings

FIG. 1 is a schematic diagram of a regenerated air average distributor of a catalytic cracking unit according to the present utility model;

FIG. 2 is a schematic diagram of an intermediate rectifying gate according to the present utility model;

FIG. 3 is a schematic diagram of a primary rectifying gate according to the present utility model;

FIG. 4 is a schematic flow diagram of fluid particles in a regeneration air distributor of a catalytic cracking unit according to the present utility model;

FIG. 5 is a flow trace plot of fluid velocity for a catalytic cracker regeneration air distributor of the present utility model;

FIG. 6 is a cross-sectional view of the fluid flow rates of the regenerated air distributor of the catalytic cracking unit of the present utility model;

FIG. 7 is a cross-sectional view of the intensity of fluid turbulence of the regenerated air distributor of the catalytic cracking unit of the present utility model;

in the figure: 1. y-shaped tee joint; 2. a first-stage concentric reducer pipe; 3. a primary flange; 4. a first-stage tee joint; 5. a primary steel pipe; 6. a primary rectifying gate; 7. a single layer wear resistant thermal liner; 8. a secondary concentric reducer; 9. a secondary flange; 10. a second-stage tee joint; 11. a secondary steel pipe; 12. a secondary rectifying gate; 13. an intermediate rectifying gate; 14. a primary connecting pipe; 15. a secondary connecting pipe; 16. a first-stage air outlet; 17. a second-stage air outlet; 18. and an intermediate air outlet.

Detailed Description

The present utility model will be described in further detail with reference to the accompanying drawings, in order to make the objects and technical solutions of the present utility model more apparent.

Example 1

As shown in fig. 1, the regenerated air average distributor of the catalytic cracking device comprises a Y-shaped tee joint 1, a primary concentric reducing pipe 2, a primary rectifying grid 6 and an intermediate rectifying grid 13, wherein one end of the Y-shaped tee joint 1 is connected with a primary tee joint 4 through the primary concentric reducing pipe 2, the primary tee joint 4 is connected with the primary rectifying grid 6 through a primary steel pipe 5, and the primary tee joint 4 is connected with the intermediate rectifying grid 13 through a primary connecting pipe 14. The rectifying grid is used for adjusting the flow pattern to enable the airflow to advance along the pipeline, so that the airflow is prevented from flowing to the abrupt change position to cause the vibration and the pressure drop increase of the distributor. One end of the Y-shaped tee joint 1 is connected with a secondary concentric reducer pipe 8, and the secondary concentric reducer pipe 8 is connected with a secondary tee joint 10. One end of the secondary tee 10 is connected with a secondary rectifying grid 12 through a secondary steel pipe 11, the secondary rectifying grid 12 is connected with a secondary flange 9, and the secondary rectifying grid 12 is provided with a secondary air outlet 17. One end of the second-stage tee 10 is connected with a middle rectifying grid 13 through a second-stage connecting pipe 15, and a middle air outlet 18 is arranged on the middle rectifying grid 13. The primary rectifying grid 6 is connected with a primary flange 3, and a primary air outlet 16 is arranged on the primary rectifying grid 6. The primary connecting pipe 14 is 120 degrees from the intermediate rectifying grid 13. The secondary connection pipe 15 and the intermediate rectification grating 13 are 120 deg.. The inner sides of the Y-shaped tee joint 1, the primary concentric reducing pipe 2, the primary tee joint 4, the primary steel pipe 5, the primary rectifying grid 6, the secondary concentric reducing pipe 8, the secondary tee joint 10, the secondary steel pipe 11, the secondary rectifying grid 12, the middle rectifying grid 13, the primary connecting pipe 14 and the secondary connecting pipe 15 are respectively provided with a single-layer wear-resistant heat insulation lining 7.

The regeneration air average distributor of the catalytic cracking device comprises the following steps in operation:

(1) An air main pipe from a starting heating furnace is divided into two paths through a Y-shaped tee joint 1, the two paths are distributed again through the tee joint after being reduced and rectified through a concentric reducing pipe, a rectifying grid is arranged at the position where an air outflow plane advances towards the vertical pipe direction, the rectifying grid adjusts the flow pattern to enable the air flow to advance along the pipeline, the flow pattern disorder of the air flow to the abrupt change position is prevented, and the vibration and the pressure drop increase of a distributor are caused; (2) The air flows out through three outlets of the distributor after rectification, and the three outlets are directly connected with three air inlets at the bottom of the regenerator.

Claims

1. The utility model provides a catalytic cracking unit regeneration air average distributor, its characterized in that, including Y shape tee bend (1), one-level concentric reducer (2), one-level rectification bars (6), middle rectification bars (13), Y shape tee bend (1) one end is connected with one-level tee bend (4) through one-level concentric reducer (2), one-level tee bend (4) link to each other with one-level rectification bars (6) through one-level steel pipe (5), one-level tee bend (4) link to each other with middle rectification bars (13) through one-level connecting pipe (14).

2. The regenerated air average distributor of the catalytic cracking unit according to claim 1, wherein one end of the Y-shaped tee joint (1) is connected with a secondary concentric reducer pipe (8), and the secondary concentric reducer pipe (8) is connected with a secondary tee joint (10).

3. The regenerated air average distributor of the catalytic cracking unit according to claim 2, wherein one end of the secondary tee joint (10) is connected with a secondary rectifying grid (12) through a secondary steel pipe (11), the secondary rectifying grid (12) is connected with a secondary flange (9), and a secondary air outlet (17) is arranged on the secondary rectifying grid (12).

4. A regenerated air average distributor for a catalytic cracking unit according to claim 3, wherein one end of the second-stage tee (10) is connected with an intermediate rectifying grid (13) through a second-stage connecting pipe (15), and an intermediate air outlet (18) is arranged on the intermediate rectifying grid (13).

5. The regenerated air average distributor of the catalytic cracking unit according to claim 1, wherein the primary rectifying grid (6) is connected with a primary flange (3), and a primary air outlet (16) is arranged on the primary rectifying grid (6).

6. Catalytic cracker regeneration air mean distributor according to claim 1, characterized in that said primary connecting pipe (14) is at 120 ° to the intermediate rectifying grate (13).

7. Catalytic cracker regeneration air mean distributor according to claim 4, characterized in that said secondary connection pipe (15) and intermediate rectifying grid (13) are at 120 °.

8. The regenerated air average distributor of the catalytic cracking unit according to claim 7, wherein the inner sides of the Y-shaped tee joint (1), the primary concentric reducer pipe (2), the primary tee joint (4), the primary steel pipe (5), the primary rectifying grid (6), the secondary concentric reducer pipe (8), the secondary tee joint (10), the secondary steel pipe (11), the secondary rectifying grid (12), the middle rectifying grid (13), the primary connecting pipe (14) and the secondary connecting pipe (15) are respectively provided with a single-layer wear-resistant heat insulation lining (7).