CN219273687U

CN219273687U - Catalyst airtight screening agent device

Info

Publication number: CN219273687U
Application number: CN202223359902.3U
Authority: CN
Inventors: 杜巨平; 安建平; 赵瑞峰; 徐振博; 徐闯飞; 杨海青
Original assignee: China Petroleum and Chemical Corp
Current assignee: China Petroleum and Chemical Corp
Priority date: 2022-12-14
Filing date: 2022-12-14
Publication date: 2023-06-30
Anticipated expiration: 2032-12-14

Abstract

The utility model relates to a catalyst airtight screening device which comprises a No. 1 catalyst tank, a No. 2 catalyst tank, an airtight screen and an air conveying and supplying pipeline, wherein the bottom outlet of the No. 2 catalyst tank is connected to the middle inlet of the No. 1 catalyst tank through the airtight screen and a catalyst transferring pipeline. The inlet of the airtight screen is provided with an airtight screen inlet valve, the outlet of the airtight screen is provided with an airtight screen outlet valve, and the air conveying pipeline is connected with the catalyst transferring pipeline. The sealed screen is provided with a sealed screen emptying pipeline, the sealed screen emptying pipeline is provided with a sealed screen emptying valve and a back flushing pipeline, the back flushing pipeline is provided with a valve, and the connection point of the sealed screen emptying pipeline and the back flushing pipeline is positioned in front of the sealed screen emptying valve. The utility model adopts the airtight screening agent device to avoid catalyst leakage caused by screen blockage, is beneficial to the safety and environmental protection of the screening agent process, reduces labor intensity of workers, saves screening agent time and saves steam for vacuumizing.

Description

Catalyst airtight screening agent device

Technical Field

The utility model belongs to the technical field of chemical production equipment, and relates to a catalyst airtight screening device.

Background

The heavy oil catalytic cracking device adopts a MIP-CGP technology of a high-low parallel catalytic cracking technology. The process is mainly characterized by reducing the olefin of catalytic gasoline and increasing the propylene content in liquefied gas. The regeneration part of the catalytic cracking device adopts a single-stage countercurrent high-efficiency regeneration technology to reduce the residual carbon of the regenerated catalyst, so that the catalyst performance can be fully exerted, and meanwhile, the adoption of too severe regeneration conditions is avoided, and the catalyst activity is protected. And screening the regenerated balancing agent before restarting the device after the shutdown maintenance is finished, so as to ensure that the agent loading process is smoothly carried out. The existing device adopts an open type sieve agent, the catalytic device originally adopts an open type closed sieve, and 300 tons of balancing agent need to be sieved for about 15 days, so that a large amount of steam is wasted, the labor intensity of workers is increased, and potential safety hazards exist.

The prior art has the following defects: (1) the screening process of the balancing agent is not airtight, the dust concentration on site is high, if the balancing agent is blocked, a large amount of catalyst leaks, environmental pollution and scalding of screening agent personnel are easy to cause, and potential safety hazards exist. (2) The screening time is long, the No. 1 catalysis of 300 tons of balancing agent is continuous from the screening of 102 to the holding of 101,24 hours, about 15 days is needed, and the labor intensity of workers is increased. (3) The vacuum extractor of the container 101 uses 1.0MPa of steam, and about 1800 tons is needed for 15 days, so that a large amount of steam is wasted.

Disclosure of Invention

The utility model aims to provide a catalyst airtight screening device, which is used for avoiding catalyst leakage caused by screen blockage, ensuring the safety and environmental protection of the screening process, reducing the labor intensity of workers and saving the screening time and steam.

The technical scheme of the utility model is as follows: the catalyst airtight screening device comprises a No. 1 catalyst tank, a No. 2 catalyst tank, an airtight screen and an air conveying pipeline, wherein the bottom outlet of the No. 2 catalyst tank is connected to the middle inlet of the No. 1 catalyst tank through the airtight screen and a catalyst transfer pipeline. The inlet of the airtight screen is provided with an airtight screen inlet valve, the outlet of the airtight screen is provided with an airtight screen outlet valve, the air conveying pipeline is connected with the catalyst transferring pipeline, and the connecting point is positioned behind the airtight screen outlet valve. The sealed screen is provided with a sealed screen emptying pipeline, the sealed screen emptying pipeline is provided with a sealed screen emptying valve and a back flushing pipeline, the back flushing pipeline is provided with valves, and the connection point of the sealed screen emptying pipeline and the back flushing pipeline is positioned in front of the sealed screen emptying valve.

The No. 2 catalyst tank is provided with a pressurizing pipeline, and a valve is arranged on the pressurizing pipeline. The air conveying pipeline is provided with a pressure gauge. The No. 1 catalyst tank is provided with a vacuumizing pipeline and a tank top emptying pipeline, and the vacuumizing pipeline and the tank top emptying pipeline are provided with valves. The diameter of the sieve plate opening of the closed sieve is 3-10 mm.

According to the novel airtight screening agent device, the airtight screen emptying pipeline and the reverse-blowing pipeline are additionally arranged at the airtight screen, so that catalyst leakage caused by screen blockage is avoided, the screening agent process is safe and environment-friendly, the labor intensity of workers is reduced, the screening agent time is greatly saved, and the vacuumizing steam is saved.

Drawings

FIG. 1 is a schematic flow diagram of a catalyst containment screening device of the present utility model;

FIG. 2 is a schematic flow diagram of a prior art closed screen apparatus;

wherein: 1-vacuumizing pipeline, 2-No. 1 catalyst tank, 3-tank top emptying pipeline, 4-catalyst transfer pipeline, 5-No. 2 catalyst tank, 6-closed screen inlet valve, 7-closed screen, 8-closed screen outlet valve, 9-back blowing pipeline, 10-closed screen emptying pipeline, 11-conveying air pipeline, 12-pressurizing pipeline and 13-closed screen emptying valve.

Detailed Description

The present utility model will be described in detail with reference to examples and drawings. The scope of the utility model is not limited to the examples, and any modifications within the scope of the claims are within the scope of the utility model.

The catalyst airtight screening device disclosed by the utility model, as shown in figure 1, comprises a No. 1 catalyst tank 2, a No. 2 catalyst tank 5, an airtight screen 7 and a conveying air pipeline 11, wherein the bottom outlet of the No. 2 catalyst tank is connected to the middle inlet of the No. 1 catalyst tank through the airtight screen 7 and a catalyst transfer pipeline 4. The airtight screen 7 is internally provided with a screen plate, and the diameter of the opening of the screen plate is 3-10 mm. The inlet of the airtight screen is provided with an airtight screen inlet valve 6, and the outlet of the airtight screen is provided with an airtight screen outlet valve 8. The air supply pipeline 11 is connected with the catalyst transfer pipeline 4, and the connection point is positioned behind the closed screen outlet valve 8. The sealed screen 7 is provided with a sealed screen emptying pipeline 10, the sealed screen emptying pipeline is provided with a sealed screen emptying valve 13 and a back flushing pipeline 9, the back flushing pipelines are all provided with valves, and the connection point of the sealed screen emptying pipeline and the back flushing pipeline is positioned in front of the sealed screen emptying valve. The No. 2 catalyst tank 5 is provided with a pressurizing pipeline 12, a valve is arranged on the pressurizing pipeline, and a pressure gauge is arranged on the air conveying pipeline 11. The No. 1 catalyst tank 2 is provided with a vacuumizing pipeline 1 and a tank top emptying pipeline 3, and the vacuumizing pipeline 1 and the tank top emptying pipeline 3 are provided with valves.

The screening operation process of the utility model comprises the following steps:

in the first step, the valve of the pressurizing pipe 12 is opened to pressurize the number 2 catalyst tank 5.

And secondly, opening a valve of the vacuumizing pipeline 1, and vacuumizing the No. 1 catalyst tank 2.

And thirdly, closing a closed screen emptying valve 13, opening valves of a closed screen inlet valve 6, a closed screen outlet valve 8 and a back flushing pipeline 9, and controlling the air pressure of the air conveying pipeline 11 to be 0.25-0.35 MPa for screening agent operation.

And fourthly, when the pressure of the conveying wind is reduced or returns to zero, the screen plate is blocked. Closing the inlet valve 6 of the closed screen, and opening the valve of the back flushing pipeline 9 to perform back flushing. After the back purge is performed for 5 minutes, the valves of the closed screen outlet valve 8 and the back purge pipeline 9 are closed, the closed screen emptying valve 13 is opened for pressure relief, and the screen plate is cleaned.

And fifthly, returning to the third step to continue the airtight screening operation.

The industrial plant performs the actual screening operation from start to end, and the screening is completed for 8 hours. The airtight screening agent device of the utility model not only greatly reduces screening agent time and saves about 1600 tons of 1.0MPa steam, reduces labor intensity of workers, but also avoids a great amount of catalyst leakage caused by screen blockage, and ensures the safety and environmental protection of the screening agent process.

Claims

1. The catalyst airtight screening agent device comprises a No. 1 catalyst tank (2), a No. 2 catalyst tank (5), an airtight screen (7) and a conveying air pipeline (11), wherein the bottom outlet of the No. 2 catalyst tank is connected to the middle inlet of the No. 1 catalyst tank through an airtight screen and a catalyst transfer pipeline (4), the airtight screen inlet is provided with an airtight screen inlet valve (6), the outlet is provided with an airtight screen outlet valve (8), and the conveying air pipeline is connected with the catalyst transfer pipeline; the method is characterized in that: the sealed screen is provided with a sealed screen emptying pipeline (10), the sealed screen emptying pipeline is provided with a sealed screen emptying valve (13) and a back flushing pipeline (9), the back flushing pipelines are all provided with valves, and the connection point of the sealed screen emptying pipeline and the back flushing pipeline is positioned in front of the sealed screen emptying valve.

2. The catalyst containment screen apparatus of claim 1, wherein: the No. 2 catalyst tank (5) is provided with a pressurizing pipeline (12), a valve is arranged on the pressurizing pipeline, and the conveying air pipeline (11) is provided with a pressure gauge.

3. The catalyst containment screen apparatus of claim 1, wherein: the catalyst tank No. 1 (2) is provided with a vacuumizing pipeline (1) and a tank top emptying pipeline (3), and the vacuumizing pipeline and the tank top emptying pipeline are provided with valves.

4. The catalyst containment screen apparatus of claim 1, wherein: the diameter of the sieve plate opening of the closed sieve (7) is 3-10 mm.