Microwave power level and processing time should be the
primary parameters affecting the performance of microwave induced
torrefaction. The water content of biomass would not
affect the reaction as much as other parameters at moderate
microwave power. Proper microwave power levels are suggested to
be set between 250 and 300W, and the particle size of biomass is
not required to be very small. Microwave-induced torrefaction can
enhance the caloric value and also increase the carbon content
while decrease the oxygen content of torrefied solid products
efficiently and economically in comparison with conventional
torrefaction.