Waste plastics show a great promise in energy recovery via combustion process due to the high calorific value and the implementation of policies to improve recycling. The output of waste plastics is especially relatively enormous. In this work, energy recycle from waste plastics was investigated in a semi-pilot scale fluidized bed combustor. The waste plastic selected in this work was polypropylene and porous alumina was used as bed material. The results showed that both excess air and temperature increase can suppress the emission of CO, while NOx and SO2 emission was independent of excess air and temperature. The combustion efficiencies in these tests were in the range of 96 to 99% for firing polypropylene in a wide range of temperatures and excess air.