EXPERIMENTAL STUDY ON COMBUSTION CHARACTERISTIC OF BIOMASS MICRON FUEL

This study developed a new kind of biomass fuel with biomass (forestry residues, agriculture waste, energy crops and so on) crushed below certain particle size (micron level, <= 250 mu m) to form biomass powder, biomass-micron-fuel (BMF). And effects of excess air coefficient, air-fuel ratio, and particle size of BMF on the combustion temperature were studied through a self designed lab-scale cyclone combustion system. Results showed that temperature increased first and then decreased with the increasing air flow rate and best excess air coefficient occurred in the region of 1.05-1.18. Similarly, combustion temperature also increased first and then decreased as the fuel feed rate increased and 225 g/m(3)-265 g/m(3) air-fuel ratio would guarantee the effective combustion of BMF. The influence of particle size on the combustion temperature was also determined under five different combustion conditions and results demonstrated that the smaller the particle size is, the higher the temperature will be.(CSPE)