A dry desulfurization and dust removal process for catalytic cracking regenerated flue gas

Abstract

The invention provides a dry desulfurization dust removing technology method for catalytic cracking regenerated flue gas. The method comprises the steps that catalytic cracking flue gas is introducedin a moving bed desulfuration reactor, the catalytic cracking flue gas and a loaded desulfurization catalyst are subjected to the desulfurization reaction, oxysulfide in the flue gas is subjected to the catalytic reaction to produce metal sulfate, and the metal sulfate is adsorbed on the desulfurization catalyst; the desulfurization catalyst containing the metal sulfate is conveyed to a desulfurization catalyst reproducer, reductive regeneration gas is introduced in the reproducer, and after the metal sulfate on the desulfurization catalyst is reduced to metallic oxide, a part of purified fluegas is utilized for lifting the regenerated desulfurization catalyst into a dust elutriating apparatus through a catalyst lifter, and after dust is recovered through elutriation, desulfurization catalyst is conveyed into moving bed desulfuration reactor for recycling; regenerated acid gas containing hydrogen sulfide is introduced in a dry gas desulfurizer to produce sulphur. According to the method, the desulfuration and dust removal of the catalytic cracking flue gas can be effectively achieved, and the desulfurization rate reaches 99% or above.

Description

technical field [0001] The invention belongs to the technical field of desulfurization catalyst environmental protection technology, and in particular relates to a dry desulfurization and dust removal process method of catalytic cracking regenerated flue gas. Background technique [0002] Catalytic cracking is one of the important secondary processing processes in refineries, mainly composed of reactors and regenerators. Under the action of the catalyst, the raw oil is cracked into light fractions in the catalytic cracking reactor. During the reaction, the catalyst is deactivated due to coking, and the deactivated catalyst is fluidized and transported to the regenerator for coke regeneration, and then circulated back to the reactor. The catalytic reaction continues. During the catalytic cracking reaction, part of the sulfide in the raw material is deposited on the catalyst. When the catalyst is burnt and regenerated in the regenerator, the sulfide on the catalyst burns to f...

AI Technical Summary

Problems solved by technology

This method can solve the problems of low SOx removal rate in the flue gas, easy formation of "blue smoke", "white smoke", "rainfall" from the scrubber, freezing and discharge of salty wastewater and other secondary pollution problems in the prior art ; and the dust in the regenerated flue gas is effectively removed at the front end to ensure the long-term safe operation of catalytic cracking smoke machines, waste heat boilers, SCR denitrification and other equipment

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