Studies on the suppression of hydrochloric acid gas generation during thermal decomposition of mixed waste plastics

Abstract

Thermal treatments including incineration are conducted as disposal methods for waste plastics, but for the waste plastics with polyvinyl chloride,etc., the hydrochloric acid gas (HCl) generated during thermal decomposition is a compound that leads to corrosion of equipment. To prevent equipment corrosion, it is necessary to suppress the generation of HCl gas. There is a method of adding calcium-based dehyrochloric material to waste as a method to suppress the generation of HCl gas during waste thermal decomposition and combustion, or by spraying absorbent in the exhaust gas containing HCl. In this study, the thermal decomposition characteristics of crushed mixed waste plastics and the amount of HCl emission were determined by experimental equipment, and the optimal conditions such as the amount of Ca addition, the addtion method, and the operation temperature will be proposed.