ER is a crucial parameter affecting gasification temperature and
the composition of producer gas. It is defined as the fuel-to-air
weight ratio used divided by the fuel-to-air weight ratio of stoichiometric
combustion. Gasification temperature profiles of
mesquite and juniper sample were measured under four different
ER conditions: 2.7, 3.2, 3.7, and 4.2. It can be seen from the Figs. 7
and 8 that Tpeak increased with the decrease of ER. This was
because a lower value of ER means more amount of oxygen
supplied to the gasifier. A high air flow rate promoted the oxidization
reaction which results in more heat release and temperature
raise in the gasifier.