Two-stage type flue gas cleaning system for garbage incinerator

Abstract

In order to solve the problems such as heat loss and energy consumption increase caused by the fact that a heat exchanger needs to be additionally mounted at the tail of an existing garbage incinerator flue gas treatment system to increase the temperature of flue gas, the invention provides a two-stage type flue gas cleaning system for a garbage incinerator. The two-stage type flue gas cleaning system is characterized by comprising a sodium bicarbonate dry process deacidifying system, a sodium bicarbonate injection system, a primary bag-type dust collector, a selective catalytic reducer SCR, a lime slurry preparation system, a half-dry type reaction tower (rotary atomizer), an active carbon storage conveying system, an active carbon storage injection system and a secondary bag-type dust collector in sequence according to a flue gas flowing direction. Due to the fact that the selective catalytic reducer SCR is arranged beside the primary bag-type dust collector and in front of the lime slurry preparation system and the half-dry type reaction tower, the temperature of flue gas is not reduced, and the inlet temperature condition of the selective catalytic reducer SCR is fully met, a heat exchanger does not need to be mounted at the front end of the SCR, and the energy loss is reduced.

Description

technical field [0001] The invention relates to a flue gas purification device of a garbage incinerator, in particular to a two-stage flue gas purification system of a garbage incinerator. Background technique [0002] At present, the waste incineration power plant incinerator flue gas treatment system uses the selective non-catalytic reduction method in the furnace to remove nitrogen oxides (NOx) in the flue gas, and then removes the nitrogen oxides (NOx) in the flue gas by semi-dry method and activated carbon injection plus bag filter. Other harmful substances such as particulate matter, sulfur oxides (SOx), dioxins, and heavy metals. [0003] However, with the increasingly stringent laws and regulations related to environmental protection, the existing waste incineration power plant flue gas treatment system can no longer meet the requirements of laws and regulations, and it is necessary to install a selective catalytic reduction device on the flue gas pipe outside the fu...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of the existing waste incinerator flue gas treatment system, in order to increase the flue gas temperature, it is necessary to install a heat exchanger at the tail, resulting in heat loss and increasing energy consumption. Dust removal system, rearrange the SCR and the original flue gas treatment system, set the selective catalytic reduction device SCR after the first-stage bag filter and before the lime slurry preparation system and semi-dry reaction tower, so that the flow through the selective catalytic reduction device The flue gas temperature of the SCR meets the requirements and meets the working conditions of the SCR, so there is no need to install a heat exchanger to save energy

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