Operation method of catalytic cracking flue gas adsorbent in catalytic cracking device

Abstract

The invention relates to an operation method of a catalytic cracking flue gas adsorbent in a catalytic cracking device. The method comprises the steps that: the adsorbent is introduced into an absorption reactor, and contacts flue gas, such that sulfur oxides and nitrogen oxides in the flue gas are removed by absorption; the adsorbent loaded with the sulfur oxides and / or nitrogen oxides automatically flows into a collector with a hydrostatic pressure effect from a sedimentation section of the absorption reactor; when the absorbent flows to a certain material level, an automatic flow pipeline control valve is closed; lift gas is delivered into the collector; through pressurizing, the absorbent in the collector is delivered into an absorbent regenerator or a lift pipe reactor. With the method provided by the invention, the absorbent in the absorption reactor in a low-pressure area can be transferred to a high-pressure area, such that a catalytic cracking catalyst and an absorbent are comprehensively unitized in a catalytic cracking device. Flue gas treatment is carried out at a low-pressure stage, and an induced draft device or a pressurizing device is avoided. And the process of catalytic cracking device pollution treatment is simplified.

Description

technical field [0001] The invention relates to a desulfurization and denitrification method for regenerating flue gas in a catalytic cracking unit, more specifically, to a catalytic cracking unit in which an adsorbent is placed between an adsorption reactor, an adsorbent regenerator and a catalytic cracking reactor method of transfer. Background technique [0002] In the catalytic cracking reaction-regeneration system, the catalyst circulates between the reactor and the catalyst regenerator. Usually, when leaving the reactor, the coke content on the ungenerated catalyst is about 3-10wt%, and the ungenerated catalyst enters the regenerator to burn and deposit The coke recovered catalytic activity, and then returned to the reactor for recycling. The coke deposited on the catalyst is mainly a reaction condensate, and its main components are carbon and hydrogen. When the cracking raw material contains sulfur and nitrogen, the coke also contains sulfur and nitrogen. Coke in th...

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