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/O-2 atmospheres were studied. Replacement of N-2 by CO2 decreased the dechlorination rate of limestone at 600-700 degrees C but increased dechlorination rate at 800-900 degrees C. The chlorine species and temperature highly influenced the HCl emission and capture efficiency of limestone for HCl in CO2/O-2 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 80CO(2)/20O(2) atmosphere. The increment of O-2 partial pressure in CO2/O-2 atmospheres promoted Cl-HCl conversion. Sulphur in the fuel suppressed the formation of HCl but decreased the dechlorination rate at 700-1000 degrees C in CO2/O-2 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. (C) 2019 Energy Institute. Published by Elsevier Ltd. All rights reserved.