A calcium catalytic cracking flue gas desulfurization and dust removal system and its application

Abstract

The invention relates to a calcium catalytic cracking flue gas desulfurization and dust removal system, which is characterized in that: the system comprises a desulfurization tower, an acidification precipitator, a desulfurization precipitator, a flocculant storage tank, a 1# vacuum rotary dehydrator, a waste water tank, Water collecting tank, oxidation tank, 2# gypsum cyclone, 1# gypsum cyclone, vacuum belt dehydrator, overflow slurry tank, filtrate tank, lime milk tank and lye tank. This system integrates the desulfurization and dust removal of flue gas in one device (desulfurization tower), and the acidification and dust removal section in the desulfurization tower removes most of the catalyst dust and a small amount of SO in the flue gas. 2 , reduce the total amount of dust entering the desulfurization section in the desulfurization tower; realize high-efficiency desulfurization and dust removal; solid gypsum can be sold as commercial gypsum, improve economic benefits, and effectively avoid secondary pollution; at the same time, the system can effectively achieve catalyst dust (hazardous The separation of waste) and gypsum products can greatly reduce the discharge of wastewater from the system, and reduce operating energy consumption and costs.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to catalytic cracking flue gas desulfurization and dust removal equipment, in particular to a calcium catalytic cracking flue gas desulfurization and dust removal system and its application. Background technique [0002] The catalytic cracking regenerated flue gas has the following characteristics: the ultra-fine dust content in the flue gas is high, the dust content fluctuates greatly, and the temperature fluctuates greatly, which requires a long continuous operation period of the desulfurization system. At present, the main processes of catalytic cracking regeneration flue gas desulfurization are: Exxon company's wet gas scrubber (WGS) process, American Belco company's EDV wet scrubbing technology, UOP company's development of THIOPAQ biological process, Lurgi company's EP-Absorber Law. Exxon's WGS process has a large pressure drop, which has a great impact on the ...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a calcium catalytic cracking flue gas desulfurization and dust removal system and its application. The system has good desulfurization effect, high dust removal efficiency, and can effectively realize catalyst dust (hazardous waste) Separation from gypsum products can greatly reduce system wastewater discharge, reduce operating energy consumption and cost, and prevent desulfurization tower fouling, blockage and other problems. This system can be applied in flue gas desulfurization and dust removal

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