When gas is used as a fuel in internal combustion engines or other applications, the optimal gasification performance conditions are those that yield the highest HHV. In order to better understand the synthesis gas HHV, the concentration of each combustible gas species was converted to an N2 free basis to eliminate the dilution
effect of N2. Figs. 12 and 13 give gas HHV of mesquite and juniper in kJ/kg and kJ/Nm3 units as a function of ER. The gas produced from juniper generally yielded higher HHV in both N2 and N2-free conditions.