Thermodynamic Analysis of Plasma Vitrification of Ash From Hazardous Waste Incinerator

Plasma vitrification is one of the most effective methods in solid waste disposal. Researches on plasma vitrification have been carried out either domestically or abroad. Based on minimization of Gibbs free energy, mass conservation equation, and energy conservation equation, thermodynamic analysis of plasma vitrification of ash from hazardous waste incinerator is carried out. The results show that temperature and excess air ratio of the furnace have an important effect on the gaseous product, solid product and energy balance of the whole system. When the temperature is higher, the main gaseous products are CO and H2; the solid products are mainly Fe and SiC; the chemical energy and sensible heat of the product are larger, and more net input is required. When the excess air ratio is higher, the main gaseous products are CO2 and H2O; the solid products are mainly Fe2O3 and SiO2; the chemical energy of the product is smaller and the sensible heat is larger, the net input required decreases first and then increases. In this paper, a complete set of thermodynamic analysis model of plasma vitrification is established, which provides an important theoretical basis for the development and operation of plasma vitrification system for the ash from hazardous waste incinerator. © 2019, Science Press. All right reserved.