A method of treating a high parallel two-vessel system settler raceway

Abstract

The application relates to a method for treating the running agent of a high-parallel two-vessel system settler, which solves the problems of the coking of a two-vessel system, the blockage of a cyclone separator leg and the jamming of a wing valve, and the running agent of a settler caused by the shortage of petroleum resources, the increasingly heavy crude oil and the increasingly heavy catalytic cracking raw material. The basic method for treating the running agent is to stop working and remove the coke, which has the problems of high treatment cost and high risk. The method comprises a settler, a cyclone separator and a pipeline, the top end of the settler is provided with the cyclone separator, the cyclone separator is connected with a fractionating tower through the pipeline, and the bottom end of the settler is connected with a coke burning tank through the pipeline. The application changes the stress direction of the coking block of the cyclone separator leg and the wing valve, achieves the purpose of flushing the cyclone separator leg and the wing valve, and realizes the purpose of treating the running agent of the high-parallel two-vessel system settler. The application has the advantages of low treatment cost, low risk, convenient operation, the avoidance of the harm to the environment and the harm to the operators.

Description

Technical Field

[0001] This invention relates to the treatment of coking in petroleum catalytic cracking feedstock, specifically a method for treating runoff from the settling tank of a parallel two-stage system with equal height. Background Technology

[0002] With the scarcity of petroleum resources and the increasing weight of crude oil, the continuous enrichment of feedstock in catalytic cracking has exacerbated coking in the two-stage catalytic cracking system. This also easily leads to blockage of the feed legs in the cyclone separator and jamming of the wing valves, resulting in catalyst leakage in the settling tank. Currently, the basic method for handling catalyst leakage is to shut down the plant and clean the coke, which is costly and risky. Summary of the Invention

[0003] To address the above issues and overcome the shortcomings of existing technologies, this invention provides a method for handling catalyst leakage in the settling tank of a parallel two-stage catalytic cracking system. This method effectively solves the problem of increased coking in the two-stage system due to the scarcity of petroleum resources and the increasing weight of crude oil, leading to the continuous enrichment of catalytic cracking feedstock. This coking also easily causes blockage of the cyclone separator feed legs and jamming of the wing valves, ultimately resulting in catalyst leakage from the settling tank. Currently, the basic method for handling catalyst leakage is mainly shutdown and coking removal, which is costly and risky.

[0004] To achieve the above objectives, the present invention provides the following technical solution: The present invention includes a settling tank, a coking tank, a regenerator, a fractionation tower, a waiting slide valve, a cyclone separator, and pipelines. A cyclone separator is installed at the top of the settling tank, and the cyclone separator is connected to the fractionation tower through a pipeline. The bottom of the settling tank is connected to the coking tank through a pipeline, and a regenerator is installed at the top of the coking tank.

[0005] According to the above technical solution: a pre-cooking slide valve is installed on the pipeline between the settling device and the coking tank.

[0006] According to the above technical solution: the pipeline between the fractionation tower and the cyclone separator is a component made of high temperature and high pressure resistant material.

[0007] According to the above technical solution: a discharge pipe is provided at the top of the regenerator.

[0008] A method for handling the leakage of settler in a parallel two-stage settling tank system of the same height includes the following steps:

[0009] 1) The two-device system cuts material and uses coke oven fuel oil to maintain bed temperature. The fractionation tower is changed to self-circulation, the amount of steam in the settling tank is increased, and the settling tower is continuously purged for hours to drive all the oil and gas in the settling tank to the low-pressure gas system and reduce safety hazards.

[0010] 2) Close the waiting slide valve. After the settling tank is pressurized to 200 kPa, it is quickly depressurized to the low-pressure gas system through the fractionation tower, so that the steam in the settling tank is blown from bottom to top, thereby loosening the coke blocks in the cyclone separator wing valve or material leg.

[0011] A method for handling the leakage of settler in a parallel two-stage settling tank system of the same height includes the following steps:

[0012] 1) The two-device system cuts material and uses coke oven fuel oil to maintain bed temperature. The fractionation tower is changed to self-circulation, the amount of steam in the settling tank is increased, and the settling tower is continuously purged for hours to drive all the oil and gas in the settling tank to the low-pressure gas system and reduce safety hazards.

[0013] 2) The settling tank and fractionation tower are pressurized with steam to 200 kPa. The waiting slide valve is quickly opened to release pressure into the coke burner, and then the pressure is released through the regenerator to the flue gas waste heat recovery and flue gas desulfurization system. In this way, a large amount of steam will flow from the fractionation tower into the cyclone separator through the oil and gas line and rush towards the cyclone separator inlet and material leg. Then it will reach the wing valve and rush out. After the waiting slide valve is opened and closed to release pressure quickly, the steam will blow from top to bottom, changing the force direction of the coke and achieving the purpose of flushing the material leg and wing valve.

[0014] Beneficial effects: This invention achieves the purpose of flushing the material legs and wing valves by changing the force direction on the coke blockage in the cyclone separator material legs and wing valves, thereby realizing the purpose of treating the runoff of the settler in the parallel two-stage system with the same height. It has low processing cost, low risk, and convenient operation, avoiding environmental hazards and operator injury. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 This is a structural diagram of method one of the present invention;

[0018] Figure 3 This is a structural diagram of method two of the present invention;

[0019] The following are the labels in the diagram: 1. Base; 2. Vertical plate; 3. Adjustment mechanism; 31. Lead screw; 32. Guide column; 33. Handle; 34. Bearing; 35. Moving block; 36. Threaded hole; 37. Guide hole; 38. Threaded hole; 4. Seat; 5. Support column; 6. First piston cylinder; 7. First piston rod; 8. First piston; 9. Foot plate; 10. Fastening belt; 11. Second piston cylinder; 12. Second piston rod; 13. Second piston; 14. Lifting plate; 15. Positioning column; 16. Weight plate; 17. Hydraulic oil. Detailed Implementation

[0020] The following is in conjunction with the appendix Figure 1-3The specific embodiments of the present invention will be described in further detail below.

[0021] Example 1, by Figure 1-3 The present invention provides an apparatus for treating the runoff from the settling tank of a parallel two-tank system of the same height, comprising a settling tank 1, a coking tank 2, a regenerator 3, a fractionation tower 4, a waiting slide valve 5, a cyclone separator 6, and a pipeline 7. The top of the settling tank 1 is equipped with the cyclone separator 6, which is connected to the fractionation tower 4 via the pipeline. The bottom of the settling tank 1 is connected to the coking tank 2 via the pipeline 7, and the top of the coking tank 2 is equipped with the regenerator 3.

[0022] A pre-cooking slide valve 5 is installed on the pipe 7 between the settling tank 1 and the coking tank 2.

[0023] The pipe between the fractionation tower 4 and the cyclone separator 6 is made of a high-temperature and high-pressure resistant material.

[0024] The top of the regenerator 3 is equipped with a discharge pipe.

[0025] A method for handling the leakage of settler in a parallel two-stage settling tank system of the same height includes the following steps:

[0026] 1) The two-stage system cuts material and uses the burning oil in the coke oven 2 to maintain the bed temperature. The fractionation tower 4 is changed to self-circulation. The amount of steam in the settling tank 1 is increased and the settling tower 4 is continuously purged for 2 hours to drive all the oil and gas in the settling tank 1 to the low-pressure gas system and reduce safety hazards.

[0027] 2) After closing the waiting slide valve 5, the pressure of the settling tank 1 is increased to 200 kPa and then quickly depressurized to the low-pressure gas system through the fractionation tower 4, so that the steam in the settling tank 1 is blown from bottom to top, thereby loosening the coke blocks in the wing valve or material leg of the cyclone separator 6.

[0028] A method for handling the leakage of settler in a parallel two-stage settling tank system of the same height includes the following steps:

[0029] 1) The two-stage system cuts material and uses the burning oil in the coke oven 2 to maintain the bed temperature. The fractionation tower 4 is changed to self-circulation. The amount of steam in the settling tank 1 is increased and the settling tower 4 is continuously purged for 2 hours to drive all the oil and gas in the settling tank 1 to the low-pressure gas system and reduce safety hazards.

[0030] 2) The settling tank 1 and the fractionating tower 4 are pressurized with steam to 200 kPa. The waiting slide valve 5 is quickly opened to release pressure into the coke burner 2, and then the pressure is released through the regenerator 3 to the flue gas waste heat recovery and flue gas desulfurization system. In this way, a large amount of steam will flow from the fractionating tower 4 into the cyclone separator 6 through the oil and gas line and rush towards the inlet and material leg of the cyclone separator 6. Then it will reach the wing valve and rush out. After the waiting slide valve 5 is opened and the pressure is released quickly, the steam will blow from top to bottom, change the force direction of the coke blocks, and achieve the purpose of flushing the material leg and wing valve.

[0031] Working principle: When using this invention, Figure 1 The two-stage system cuts material, and the coking tank 2 is used to burn oil to maintain the bed temperature. The fractionation tower 4 is changed to self-circulation, and the amount of steam in the settling tank 1 is increased. The settling tower 4 is continuously purged for 2 hours to drive all the oil and gas in the settling tank 1 to the low-pressure gas system and reduce safety hazards.

[0032] Figure 2 Method 1: Close the waiting slide valve 5, pressurize the settling tank 1 to 200 kPa, and then quickly depressurize it to the low-pressure gas system through the fractionation tower 4, so that the steam in the settling tank 1 is blown from bottom to top, thereby loosening the coke blocks in the wing valve or material leg of the cyclone separator 6.

[0033] Figure 3 Method 2: Pressurize the settling tank 1 and fractionation tower 4 with steam to 200 kPa, then quickly open them. Figure 3 The waiting slide valve 5 releases pressure into the coke burner 2, and then through the regenerator 3 to the flue gas waste heat recovery and flue gas desulfurization system. In this way, a large amount of steam will flow from the fractionation tower 4 into the cyclone separator 6 through the oil and gas line and rush towards the inlet and material leg of the cyclone separator 6. Then it reaches the wing valve and rushes out. After the waiting slide valve is opened and closed, the pressure is quickly released, so that the steam blows from top to bottom, changing the force direction of the coke and achieving the purpose of flushing the material leg and wing valve.

[0034] Beneficial effects: This invention achieves the purpose of flushing the material legs and wing valves by changing the force direction on the coke blocks in the cyclone separator 6 material legs, thereby achieving the purpose of treating the runoff in the settling tank 1 of the parallel two-stage system at the same height. It has low processing cost, low risk, and convenient operation, avoiding environmental hazards and operator injury.

[0035] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for handling the leakage of settler in a parallel two-stage sedimentation system of the same height, characterized in that, Includes the following steps: 1) In the catalytic cracking unit, the two-stage system cuts the feed, and the coking tank (2) is used to burn oil to ensure the bed temperature. The fractionation tower (4) is changed to self-circulation, and the amount of steam in the settling tank (1) is increased. The settling tower (4) is continuously purged for 2 hours to drive all the oil and gas in the settling tank (1) to the low-pressure gas system and reduce safety hazards. 2) The settling tank (1) and the fractionating tower (4) are pressurized with steam to 200 kPa. The waiting slide valve (5) is quickly opened to release pressure into the coke burner (2), and then the pressure is released through the regenerator (3) to the flue gas waste heat recovery and flue gas desulfurization system. In this way, a large amount of steam will be poured from the fractionating tower (4) into the cyclone separator (6) through the oil and gas line and rush to the inlet and material leg of the cyclone separator (6). Then it reaches the wing valve and rushes out. After the waiting slide valve (5) is opened and the pressure is released quickly, the steam is blown from top to bottom, changing the force direction of the coke block, so as to achieve the purpose of flushing the material leg and wing valve.

2. The method for treating the runoff of the settling tank in a parallel two-tank system of the same height according to claim 1, characterized in that, The pipe between the distillation tower (4) and the cyclone separator (6) is a component made of high temperature and high pressure resistant material.

3. The method for treating the runoff of the settling tank in a parallel two-tank system of the same height according to claim 1, characterized in that, The top of the regenerator (3) is provided with a discharge pipe.

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