Discharge system and process of refuse incinerator flue gas

Abstract

The application discloses a discharge system and process of refuse incinerator flue gas. The process includes the steps of denitrifying; removing acid gas and divalent mercury compounds by a semi-dryprocess; carrying out activated carbon adsorbing and dry powder deacidifying; removing dust; carrying out flue gas heat exchanging; decomposing pollutants by low temperature plasma; carrying out wet deacidifying. The system and process herein are suitable for synchronous and efficient deep removal of various pollutants (including particles, nitric oxides, sulfur oxides, dioxin, hydrogen chloride,hydrogen fluoride, mercury and other heavy metals), and can provide ultralow-concentration discharge of refuse incineration flue gas, with NOX<50 mg / Nm<3>, SO2<35 mg / Nm<3>, dioxin TEQ<0.01 ng / Nm<3>, and discharge indexes of HF, HCl, mercury and other heavy metals greatly decreased.

Description

technical field [0001] The invention relates to the field of air pollution purification, in particular to a waste incinerator flue gas discharge system and process. Background technique [0002] With the rapid development of my country's economy, the rapid improvement of people's living standards, the continuous improvement of the urbanization process, the generation of various types of garbage is also increasing sharply. According to the "Annual Report on the Prevention and Control of Environmental Pollution by Solid Waste in Large and Medium-sized Cities in China in 2017" published by the Ministry of Environmental Protection, in 2016, 214 large and medium-sized cities produced 188.505 million tons of domestic waste, with an annual growth rate of 8-10%. Increase. Domestic waste disposal methods are mainly landfill and waste incineration. Waste landfill consumes a lot of land resources, and is prone to sewage leakage to pollute soil and groundwater, destroy land resources,...

AI Technical Summary

Problems solved by technology

Semi-dry deacidification, dry deacidification and wet deacidification processes all have limitations in deacidification efficiency, which can achieve lower emission indicators, but it is difficult to fully achieve the purpose of ultra-low emission treatment

[0012] To sum up, the current domestic traditional waste incineration flue gas treatment can only achieve low-concentration emission control, but with the gradual increase in environmental protection emission standards, emission control becomes more and more difficult, especially for NO X , dioxin and metallic mercury, it is difficult to meet the demand for ultra-low emissions

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