Method for treating catalytic cracking regeneration flue gas

Abstract

The invention relates to a method for treating catalytic cracking regeneration flue gas. The method comprises the following steps that (1) catalytic cracking regeneration flue gas containing sulfur oxide enters an adsorption tower, and is subjected to contact adsorption with active coke to obtain purified flue gas and to-be-regenerated coke adsorbing sulfur oxide; (2) the to-be-regenerated coke isregenerated under a regeneration condition to obtain regenerated coke and regenerated tail gas containing sulfur oxide; and (3) the regenerated tail gas returns to a catalytic cracking reactor to make the sulfur oxide in the regenerated tail gas contact a catalytic cracking catalyst, a raw material and a product to convert into hydrogen sulfide, the hydrogen sulfide is subjected to fractionation,absorption stabilization and desulfurization along with the catalytic cracking product to realize recovery of sulfur resources, and the coke powder in the regenerated tail gas enters a catalytic cracking regenerator along with the catalytic cracking catalyst so as to be subjected to combustion removal. With the method, catalytic cracking regeneration flue gas can be purified, equipment for treating active coke regeneration tail gas and recovering sulfur is not to be independently arranged, and a small amount of coke powder carried in the regeneration tail gas can be treated.

Description

technical field [0001] The present disclosure relates to the field of catalytic cracking flue gas purification, and in particular, relates to a method for treating regenerated flue gas from catalytic cracking. Background technique [0002] The catalytic cracking unit includes reaction-regeneration, fractionation and absorption stabilization. After the raw material enters the reactor, the product oil gas is generated under the action of appropriate temperature, pressure and catalyst. Part of the sulfur contained in the raw material is converted into hydrogen sulfide, and this part of hydrogen sulfide enters the downstream fractionation and absorption along with the oil gas. , hydrogen sulfide enters dry gas, liquefied petroleum gas and sulfur-containing sewage. The refinery is equipped with dry gas, liquefied gas desulfurization devices and sulfur-containing sewage stripping devices, which can remove hydrogen sulfide contained in the above products into acid gas. This part ...

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Problems solved by technology

[0006] The existing active coke dry flue gas purification process needs to install a separate regeneration tail gas treatment device after the active coke regeneration tower, and send the tail gas to the sulfuric acid plant after washing. However, the existing tail gas washing system has serious problems, and the waste water produced is also intractable

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