关键词: 陈腐垃圾, 筛上物, 掺烧, 热值, 尾气污染物浓度

Abstract: Relied on the newly built domestic waste incineration plant, a long-term feasibility test for screening stale waste in landfill and co-incineration with municipal solid waste was carried out. Through the composition characteristics analysis of the screened materials obtained by the excavation of stale waste in domestic waste landfills and the pre-processing with “drum screening + air sorting”, it was found that the proportion of light substances such as plastics in the screened materials (dry basis) accounted for about 53%, and had a negative linear relationship with the moisture content of the screened materials. The screened material was transported to the incineration plant and mixed with raw waste at certain designed ratios. Based on data such as the amount of waste entering the furnace, tonnage of evaporation, etc, the calorific value of the screened material was about 6 258 kJ/kg by using the law of conservation of energy. Blended combustion could lead to a significant increase in the average daily unit consumption of slaked lime in the waste gas treatment system, but could not affect the average daily unit consumption of urea, and it could also significantly increase the average daily production of slag and fly ash. Based on the highly automated waste gas treatment system, blended combustion would neither significantly increase the hourly average concentration of flue gas pollutants, nor significantly increase the instability of tail gas emissions. And all maximum concentrations of pollutants met the relevant emission standards requirements.

Key words: aged refuse, screened materials, blended combustion, calorific value, pollutant concentrations in waste gas