Effects of Temperature and Equivalence Ratio on Pine Syngas Primary Gases and Contaminants in a Bench-Scale Fluidized Bed Gasifier

Effects of equivalence ratio (ER = 0.15, 0.25, and 0.35 at 934 degrees C) and temperature (790, 934, and 1078 degrees C at 0.25 ER) were investigated in air gasification of pine for primary gases and contaminants. CO and H-2 increased while CO2 and CH4 decreased from 790 to 1078 degrees C. Opposite trends were observed for ER. Based on overall contaminant weight, tar was highest at all temperatures (7.81, 8.24, and 8.93 g/kg dry biomass) and ERs (13.08, 8.24, and 2.51 g/kg dry biomass). NH3 varied from 1.63 to 1.00 g/kg dry biomass between 790 and 1078 degrees C and from 1.76 to 1.47 g/kg dry biomass between 0.15 and 0.35 ER. H2S ranged between 0.13 and 0.17 g/kg dry biomass from 790 to 1078 degrees C and between 0.154 and 0.18 g/kg dry biomass from 0.15 to 0.35 ER. Finally, HCl yields ranged from 13.63 to 0 mg/kg dry biomass and from 11.51 to 0.28 mg/kg dry biomass over the range of temperature and ER, respectively.