Characteristics of gas from the fluidized bed gasification of refuse paper and plastic fuel (RPF) and wood biomass

Myo Min Win; Asari, M.; Hayakawa, R.; Hosoda, H.;Yano, J.; Sakai, S. (2019) Waste Management, 87: 173-182


Energy recovery from small and medium scale waste thermal treatment facilities in the municipalities of
Japan is challenging, owing to low power generation efficiency and high economic demands. Gas Engine
(GE) generation is considered an efficient resource utilization method in these facilities. In this study,
new and consistent feedstock, Refuse Paper and Plastic Fuel (RPF), and wood pellets were tested in an
air-blown Fluidized Bed Gasifier (FBG) for syngas utilization in a GE. With temperatures ranging from
700 to 940 C and varying Equivalence Ratios (ER) of 0.3-0.5, some of the most important product gas
characteristics were analyzed, including the Lower Heating Value (LHV) and tar concentration levels.
Gas composition results revealed that the concentration tendencies varied for the product gases CO,
H2, and hydrocarbons, depending on the feedstock type, whereas the same tendencies were observed
for CH4 and tar concentrations. Through the ER range, the LHV of product gas for RPF and wood pellets
was 3.4-5.9 MJ/Nm3. Tar concentrations decreased to 2.5-14.0 g/Nm3-dry as the ER was raised. The optimal ER for LHV performance in GE generation was approximately 0.4 for RPF and wood pellets, and remaining tar concentrations were about 5.0 g/Nm3-dry at the gasifier exit.


Wood pellets; Refuse paper and plastic fuel; Fluidized bed gasification; Raw product gas quality; Lower heating value; Tar