Chlorine behavior during co-hydrothermal treatment of high alkali coal and PVC

2016 International Conference on New Energy and Future Energy System

Huang, N.^1 ; Zhao, P.T.^1,2 ; Li, Z.Z.^1 ; Li, T.^1

School of Electric Power Engineering, China University of Mining and Technology, Xuzhou

221116, China^1

National Engineering Research Center for Coal Preparation and Purification, China University of Mining and Technology, Xuzhou

221116, China^2

关键词: Chloridion;    Holding time;    Hydrothermal treatments;    Operating condition;    Organic chlorine;    Simultaneously removal;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/40/1/012070/pdf
DOI  :  10.1088/1755-1315/40/1/012070

来源: IOP

【 摘 要 】

The hydrothermal treatment (HT) is an effective method to remove chlorine from chlorinated wastes under mild conditions. However, the alkali was required to improve the dechlorination efficiency. Meanwhile, the alkalis contents removed was necessary to realize the clean and highly efficient utilization of coal. This work was trying to investigate the feasibility of simultaneously removal alkalis and chlorine by co-hydrothermal treatment of PVC and high-alkali coal. The effect of operating conditions including the HT temperature, the holding time and particle sizes of coal on the dechlorination efficiency (DE) of PVC during the HT process was experimentally studied in this work. The results show that the DE increased with the rise of: 1) particle sizes (0.054∼0.22mm), 2) holding time (30∼90 min) and 3) temperature (240∼300 °C). In detail, under 300 °C and 60min of holding time, the 85.18% of DE with first PS was lower than the 93.93% of DE with second PS and 100% of DE with third PS. The organic chlorine mainly transferred into chloridion in aqueous solution in HT process. All the results indicate that it is a prospective way to simultaneously removal alkalis and chlorine by co-hydrothermal treatment of chlorinated wastes and high-alkali coal.