Coal and Biomass Partial Gasification and Soot Properties in an Atmospheric Fluidized Bed

摘要

Using air as the gasification medium, one kind of coal and one kind of biomass partial gasification studies were carried out in a laboratory-scale atmospheric fluidized bed with the various operating parameters. The effects of the O/C ratio, biomass/(coal + biomass) (F_b/F_m) ratio, and bed temperature on the fuel gas compositions and the high heating value (HHV) were reported in this paper. The results show that the concentrations of carbon monoxide, hydrogen, and methane and the HHV decrease with the rise of the O/C ratio and the decline of the F_b/F_m ratio for coal and biomass partial gasification. A rise of the bed temperature favors the semi-gasification reaction of coal, but the concentrations of carbon monoxide and methane and the HHV decrease with the rise of the bed temperature, except hydrogen. In addition, the gas HHVs are between 1.0 and 3.3 MJ N~(-1) m~(-3). The gas yield and carbon conversion increase with the O/C ratio, F_b/F_m ratio, and bed temperature. The atomic percentage of carbon increases and the atomic percentage of oxygen decreases with the rise of the O/C ratio in fly ash. The concentration of soot decreases along with the O/C ratio in fly ash.