Biomass gasification is being considered as one of the most promising technologies for converting biomass into gaseous fuel. Here we present the results of gasification, using an adiabatic fixed bed updraft gasifier with air and carbon dioxide as gasification medium, for redberry juniper (Juniperus pinchotii), one of the woody species that dominate uncultivated lands in the Southern Great Plains, U.S.A., that may have potential for bioenergy utilization. The effect of gasifying the woody fuels with carbon dioxide (oxy fuel gasification) was carried out to study for increased production of carbon monoxide through Boudouard reaction. The effect of three different moisture contents: 5–6%, 11–12%, and 23–24%, on the tar yield was investigated for juniper using air as the gasification medium since the amount of tar in the gas produced impacts the way the gas is utilized for different applications. It was observed that oxy fuel gasification of juniper resulted in increased production of carbon monoxide at higher peak temperatures and hence increased heating value of the resulting gas mixture (6264 kJ/ Nm3 with inerts CO2 and N2, 19750 kJ/Nm3 inert free). It was found that the tar yield was more than 100 g/Nm3 of the gas produced using air as gasification medium for juniper fuels with moisture content between 5–6% and 11–12%. Also, the tar yield increased with the increase of equivalence ratio (ER). At a fixed ER, tar increased with the increasing moisture content. However, when the fuel moisture content reached 23–24%, the tar yield reduced significantly due low gasification temperature which reduced the pyrolysis and other gas phase reaction rates within the gasifier.

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