Catalytic cracking method and device in favor of processing inferior heavy oil

Abstract

The invention discloses a catalytic cracking method in favor of processing inferior heavy oil, which is characterized in that a raising pipe for common heavy oil is used for processing the heavy oil of which density is less than or equal to 0.935 and a carbon residue value is less than or equal to 8; a raising pipe for inferior heavy oil is used for processing the heavy oil of which high intensity is more than 0.935 and a carbon residue value is between 8-13; and recycle oil and slurry oil separated by a main fractionating tower are all cracked in the raising pipe for the inferior heavy oil. Two fractionating towers are designed, the main fractionating tower is used for carrying out fractionation on reaction oil and gas in the raising pipe for the common heavy oil, and a secondary fractionating tower is used for carrying out fractionation on oil and gas in the raising pipe for the inferior heavy oil; the slurry oil and the recycle oil generated by the main fractionating tower are all retuned to the raising pipe for the inferior heavy oil to react; a small amount of slurry oil generated by the secondary fractionating tower is returned to the raising pipe for the inferior heavy oil to recycle; a large amount of recycle oil generated by the secondary fractionating tower is returned to the raising pipe for the inferior heavy oils; oil and gas in the top of the main and secondary fractionating towers are collected together to an oil and gas separator above the fractionating towers for moisture separation; and a coke-burning drum is used for carrying out high-intensity coke-burning on a catalyst which is used for processing the inferior heavy oil, and then the catalyst enters into a regenerator to perform catalyst regeneration.

Description

technical field [0001] The invention belongs to the technical field of catalytic cracking reaction, and mainly relates to a catalytic cracking method and device beneficial to processing inferior heavy oil. Background technique [0002] At present, domestic and foreign catalytic cracking processes are mainly divided into two types: single-riser and double-riser processes according to the layout of the riser. [0003] The catalytic process of single riser, single settler, and single fractionation tower was developed relatively early and mature. The representative process is shown in Figure-2. The raw material oil enters from the lower part of the riser 19, and the catalyst coming from the bottom of the reaction is mixed with the raw material during the rising process. The oil is charged and contacted, and through a series of reactions, the mixed oil gas composed of gasoline, diesel oil, liquefied gas and other products is finally obtained. After the settler 7 is separated from...

AI Technical Summary

Problems solved by technology

Solve the problems of large deviation of raw material oil quality, high coke rate of inferior oil, coking effect, catalyst regeneration and other problems in the existing double riser production process

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