Calcium-process catalytic cracking flue gas desulfurizing and dedusting system and application

Abstract

The invention relates to a calcium-process catalytic cracking flue gas desulfurizing and dedusting system. The system is characterized by comprising a desulfurizing and acidizing tower, an acidizing precipitator, a desulfurizing precipitator, a flocculant storage tank, a first vacuum rotating dewaterer, a wastewater tank, a water collection tank, an oxidization tank, a second gypsum cyclone, a first gypsum cyclone, a vacuum belt dewaterer, an overflowing size tank, a filtrate tank, a lime milk tank and an alkaline liquid tank. Desulfurizing and dedusting of flue gas are integrated in one device (the desulfurizing and acidizing tower), and an acidizing and dedusting section in the desulfurizing and acidizing tower removes the vast majority of catalyst dust and a little amount of SO2 in the flue gas, so that total amount of dust entering a desulfurizing section in the desulfurizing and acidizing tower is reduced, and efficiency desulfurizing and dedusting are realized; solid gypsum can serve as commercial gypsum to be sold, so that economic benefit is increased, and secondary pollution is avoided effectively; by the system, the catalyst dust (hazardous waste) and a gypsum product can be effectively separated, so that wastewater emission of the system is lowered substantially, and running energy consumption and cost are lowered.

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] Catalytic cracking regenerated flue gas has the following characteristics: the content of ultrafine dust in the flue gas is high, the dust content fluctuates greatly, and the temperature fluctuates greatly, requiring the continuous operation period of the desulfurization system to be long. At present, the main processes of catalytic cracking regeneration flue gas desulfurization are: Exxon company's wet gas scrubber (WGS) process, the EDV wet scrubbing technology developed by Belco company of the United States, the THIOPAQ biological method developed by UOP company, and the EP-Absorber company of Lurgi company. Law. Exxon's WGS process has a large pr...

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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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