Polyvinyl chloride cooperates with biomass to assist in directional conversion N and Cl as NH3 and HCl to prepare clean fuel by low temperature microwave heating

This work proposes an innovative integrated process to product clean fuel. Rice husk, straw and polyvinyl chloride (PVC) were used as parent materials. We studied the effect of PVC: biomass, microwave heating power, active carbon and the temperature on the nitrogen and chlorine removal ratio. All of the parameters turned out to be significant factors. When PVC: biomass was increased from 0 to 1:9, the denitrification ratios of rice husk (RH) and straw (ST) were raised from 36.2% to 49.38% and 31.5% to 39.3%, respectively. The NH3 production ratio was increased almost 10% when PVC: biomass increased from 0 to 3:7. When the microwave heating power increased from 500 W to 1500 W, the denitrification ratio and NH3 production ratio decreased from above 50% to 40% below and from about 40% to 30%, respectively. Active carbon and the high heating temperature were both significantly contributed to accelerate getting rid of N and Cl from the biomass and PVC, but had negative effect on the NH3 and HCl production ratio. The synergistic dechlorination and denitrification effect of PVC with RH was better. There exited non thermal effect during microwave heating co-pyrolysis process. And the optimum operation conditions turned out to be PVC: biomass 1:9, microwave heating power 500W, active carbon 1.6g and the heating temperature 300℃. All these results showed that the co-pyrolysis of PVC with biomass was feasible for clean fuel production. This work provided a new viewpoint for the development of technology of chlorinated waste and nitrogen waste treatment.