Flue gas deacidification and dust removal system

Abstract

The invention provides a flue gas deacidification and dust removal system. The flue gas deacidification and dust removal system comprises a deacidification tower, a slurry tank, a dry powder injectiondevice, a bag type dust collector and a circulating heater, wherein the slurry tank, the deacidification tower and the bag type dust collector are sequentially communicated, a dry powder injection port is connected to a pipeline between a flue gas outlet of the desulfurization tower and a gas inlet of the bag type dust collector, a gas outlet of the bag type dust collector is communicated with agas inlet pipeline of the circulating heater, and a gas outlet of the circulating heater is communicated with a gas inlet pipeline of the bag type dust collector. According to the flue gas deacidification and dust removal system, flue gas exhausted by an incinerator is treated when the incinerator works abnormally, the situations that dew is formed on the surface of a cloth bag of the bag type dust collector, the cloth bag is pasted and corroded by acids are avoided, exhausted gas does not contain dust, and the removal efficiency of acid pollutants in the flue gas subjected to cyclic heating treatment is higher.

Description

technical field [0001] The invention relates to the technical field of flue gas treatment equipment, in particular to a flue gas deacidification and dust removal system. Background technique [0002] Waste incineration flue gas contains a variety of pollutants: acid pollutants, dust, NO x , dioxins and heavy metal pollutants, acid pollutants (mainly HCl, HF, SO 2 ) and dust (small particle size, high viscosity), most engineering projects use semi-dry method (Ca(OH) 2 ) deacidification + bag dust removal process to treat the flue gas, but during the start-up and shutdown of the incinerator, abnormal situations or during boiler commissioning, due to the low exhaust gas temperature of the boiler, it is not suitable to spray lime slurry, and the semi-dry deacidification system cannot work normally. Putting it into operation will cause dew condensation on the surface of the bag filter and the problem of bag sticking will be serious. Contents of the invention [0003] The pur...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a flue gas deacidification and dust removal system applied to waste incineration flue gas to solve the problem of low flue gas temperature when the incinerator is working abnormally. Problems of surface condensation and bag sticking

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