HCl Emission and Capture Characteristics During PVC and Food Waste Combustion in CO2/O2 Atmosphere

The emission and capture characteristics of HCl during PVC and food waste combustion in CO2/O2 atmospheres were studied. Replacement of N2 by CO2 decreased the dechlorination rate of limestone at 600–700 °C but increased dechlorination rate at 800–900 °C. The chlorine species and temperature highly influenced the HCl emission and capture efficiency of limestone for HCl in CO2/O2 atmospheres. Compared with inorganic chloride in food waste, organic chlorine in PVC had much greater Cl–HCl conversion percent (75.0–93.9%), and higher dechlorination rate (20.4–44.9%) with 10% limestone in 80CO2/20O2 atmosphere. The increment of O2 partial pressure in CO2/O2 atmospheres promoted Cl–HCl conversion. Sulphur in the fuel suppressed the formation of HCl but decreased the dechlorination rate at 700–1000 °C in CO2/O2 atmospheres. The dechlorination efficiency of limestone was better than magnesium based additive and could be improved by modification with NaOH. This research helps control HCl and manages MSW oxy-fuel incineration.