Study on the combustion characteristics and pollutant formation behavior of semi coke micro-particles loaded with pesticide distillation residues

Abstract

To effectively promote the resource utilization of pesticide distillation residues, this study employs strong shear force to thoroughly mix the residues with semi-coke micro-particles, ensuring their uniform distribution on the surface of the microparticles. This approach allows for the exploration of the combustion characteristics and pollutant formation pathways of semi-coke micro-particles loaded with pesticide distillation residues. The results indicate that, when the heating rate is 10 °C/min, the ignition temperature decreases as the proportion of pesticide residue increases. Additionally, as the heating rate rises, both the ignition temperature and burnout temperature increase. During pollutant dissociation, the pyridine ring and its derivatives in the pesticide residue preferentially cleave the CCl bond to generate chlorine radicals, while organic components such as carbon-carbon triple bonds in the semi-coke also undergo cleavage and release heat, leading to the breakage of bonds in the pyridine ring. These cleavage products react with hydroxyl radicals and oxygen radicals to form unsaturated organic compounds such as C₄H₄ and C₂H₄, as well as small amounts of chlorine, sulfur, fluorine, carbon, and nitrogen compounds. As the oxygen concentration increases, the unsaturated bonds are oxidized. After cooling, the main products are CO₂, H₂O, HCl, HF, NO_x, and COS. Furthermore, the inorganic components in the semi-coke exhibit good fluorine and chlorine fixation effects. This study not only reveals the combustion characteristics and pollutant generation pathways of the semi coke particles loaded with pesticide distillation residues, but also foretells its broad application prospects in the field of organic hazardous waste resource utilisation.