Abstract: Under the conditions that the chain stoker main constructions not to be change and the capacity of the chain stoker not to be reduced, the rice hull particles were utilized in the 20 t/h chain stoker. The result shows with the increase of biomass ratio, the loss on ignition(LOI) of stag gradually decreased. The CO concentration and temperature of exhaust gas all gradually increased. The main reason of temperature increase was the combustion of biomass volatile in convective heating surface. It is concluded the small flux, high pressure and big velocity secondary air should be arranged in the front arch region or in the chamber throat in order to enhance the flue gas turbulent and the mix and combustion of air and volatile, so as to decrease the emission of SO₂ and save the high quality bituminizes when the coal burning chain stoker combust biomass fuel.

Key words: rice hull, particle, chain stoker, combustion