Abstract: The conventional waste incineration fly ash disposal technology generally has the problems of high energy consumption, high cost, and the need for further disposal of the generated secondary fly ash. The generation mechanism of dioxins in waste incineration flue gas and the definition of waste incineration fly ash as hazardous waste were analyzed. The traditional typical flue gas purification technology route of “SNCR + semi dry process + dry process + activated carbon injection + bag filter + SCR denitrification” was introduced, and a new technology route that can significantly reduce the reduction of hazardous waste in the process of waste incineration flue gas purification was proposed. By adding a high-temperature electrostatic precipitator in the high-temperature section of the waste heat boiler, the dust collection of a single bag filter is increased to three-stage dust collection. The high-temperature electrostatic precipitator collects dust as solid waste, the first stage bag filter collects dust as hazardous waste, and the second stage bag filter collects dust as solid waste, significantly reducing the production of hazardous waste. The economic analysis of a 1 000t/d waste incineration power plant in Zhejiang Province before and after applying two technical routes shows that after adopting the new technology route, the reduction of hazardous waste reaches 84.37%, and the annual treatment cost is reduced from 6.384 million yuan to 0.7 million yuan, with significant economic benefits.
