Equilibrium Analysis for the Air-controlled Incineration of Industrial Hazardous Wastes

摘要

The air-controlled incineration mode, which is manipulated as the sub-stoichiometric air is supplied in primary chamber followed a high temperature oxidative destruction in the secondary chamber, is preferred in the engineering practice of solid waste. In this paper, the non-stoichiometric equilibrium model, based on free energy minimization approach, is developed to predict the yields of the incomplete products such as the CO, H_2, CH_4, CnHm, H_2S, HCl, COS, NH_3, HCN, etc. The model considers 6 elements and 40 species in both the gas and solid phases. The air-fuel ratio has great influence on the distribution of the products in primary chamber, where a critical changing zone exists at air-fuel ration of 0.8-0.9. The effect of primary chamber temperature is discussed. Since the industrial waste in this paper has a relatively high content of chloride, the influences of chloride on the sub-stoichiometric product distribution are studied. Finally, the equilibrium calculation has been used to determine the feasibility of using in-furnace Ca-based sorbenrs to capture the HCl emission.