Anti-coking gas-solid separation method and equipment

Abstract

The invention relates to an anti-coking gas-solid separation method and equipment and belongs to the technical field of petrochemical engineering and fluidization. The method and the equipment are used for solving the problems of reaction that settlers undergo coking and excessive thermal cracking. The method comprises the processes of rapid gas-solid separation, second-stage separation, second-stage dipleg flutter valve discharge and oil vapor lead-out and is characterized by adopting closed rapid cyclone separation, arranging catalyst diversion facilities, enabling the catalyst diversion facilities to be connected with the closed rapid cyclone separation and the second-stage separation, so as to form a closed separation system, and closely guiding a catalyst, oil vapor and anti-coking steam, which are discharged from second-stage dipleg flutter valves, into the closed separation system. According to the method disclosed by the invention, only steam exists in a settler without oil vapor and a catalyst, so that cleanup is realized, the problem of coking of the settler is thoroughly solved, the reaction of excessive thermal cracking of the oil vapor is reduced, the yield of dry gas is lowered, and the yield of products is increased. The invention further provides a closed rapid cyclone separator and catalyst diversion equipment, which are used for implementing the method disclosed by the invention. The method and the equipment are applied to devices for catalytic cracking, catalytic pyrolysis and the like of heavy oil.

Description

technical field [0001] The invention belongs to the technical fields of petrochemical industry and fluidization, and in particular relates to a method and equipment for anti-coking gas-solid separation. Background technique [0002] The outlet of the riser reactor of the catalytic cracking unit in the refinery is equipped with a gas-solid rapid separation device, which is used to realize the rapid separation of oil gas and catalyst and terminate the cracking reaction. In the early days, there were umbrella caps, inverted L, T-shaped and other structural types, and the separation efficiency was generally 70% to 80%. The separated oil and gas rose slowly in the settler with a larger diameter, and then entered the cyclone separator on the top of the settler (referred to as top spin). This part of oil and gas stays in the settler for 20 to 50 seconds, and there are still reactions such as excessive thermal cracking and condensation at a high temperature of 500°C, which affects ...

AI Technical Summary

Problems solved by technology

This solution can reduce excessive thermal cracking and coking to a certain extent, but the coarse rotary leg is still positive pressure differential discharge, there will still be oil and gas discharged from the material leg, there is a chance of coking in the lower part of the settler, and the discharge of the coarse rotary leg The oil and gas velocity is high, which disturbs the catalyst in the lower part of the settler and increases the catalyst density in this area. The introduction of oil and gas in this area will increase the catalyst density at the top-swivel inlet, resulting in an increase in the amount of catalyst carried over. In addition, improper design of this scheme will easily lead to a large amount of catalyst running loss

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