A device used in catalytic cracking regenerator for pre-stripping and rapid removal of oil and gas on catalyst surface

Abstract

The invention relates to the technical field of petrochemical equipment, in particular to a device for carrying out pre-stripping in a catalytic cracking regenerator and fast removing oil gas on the surface of a catalyst. The device aims at carrying out fast pre-stripping on the catalyst coming out of a coarse cyclone dipleg, removing the oil gas carried on the catalyst, reducing the heat cracking reaction and increasing the yield of light oil. The device has the following advantages that through the device, the mean detention time of the oil gas can be shortened, the heat cracking reaction can be reduced, the yield of dry gas and coke can be lowered, and the yield of the light oil can be increased. A Venturi tube is adopted in a pre-stripping tube, the catalyst achieves efficient stripping, the positive differential pressure of unloading of the coarse cyclone dipleg and a top cyclone dipleg is reduced, the gas-solid flowing state in the coarse cyclone dipleg and the top cyclone dipleg is reduced to a large degree, and the amount of gas carried downward during conventional positive differential pressure unloading is reduced. In addition, the amount of steam passing through the pre-stripping tube can be adjusted according to the quantity of materials on an outlet of a lifting tube, and the operating flexibility of the whole device is improved.

Description

technical field [0001] The invention relates to the technical field of petrochemical equipment, and is a device used in a catalytic cracking regenerator for pre-stripping and quickly removing oil and gas on the catalyst surface. Background technique [0002] Catalytic cracking is the most important heavy oil lightening process in refineries to increase the processing depth of crude oil and produce high-octane gasoline, diesel and liquefied gas. It is also the main means for refineries to obtain economic benefits. As the world's oil and gas extraction time increases, the reaction raw materials used for catalytic cracking are gradually becoming heavier. Therefore, the depth of the cracking reaction increases continuously, the temperature of the reaction gradually increases, and the trend of non-selective secondary cracking and thermal cracking in the settling space becomes more and more significant. Secondary cracking and thermal cracking reactions will directly reduce the y...

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Problems solved by technology

Secondary cracking and thermal cracking reactions will directly reduce the yield of light oil, while the yield of dry gas and coke will increase

[0004] In the early stage abroad, Haddad et al. proposed a closed-type direct-connected cyclone separation system, that is, the coarse-swirl gas outlet is directly connected to the top-swirl separation system inlet with a conduit. This method indeed shortens the residence time of oil and gas to a large extent and reduces Thermal cracking reaction, but the disadvantage is that the operating flexibility is relatively small

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