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In order to investigate the heat exchange mechanism between the ceramic balls heat carrier, biomass particles and air, a downward vertical flow tube of particles separation apparatus was developed and the heat exchange experiments with ceramic balls heat carrier and biomass particles can be conducted with the apparatus. The feeding experiments of particles showed that the feeding rate of the ceramic balls and the biomass particles were stable and these two kinds of particles were separated completely. Based on the data obtained from the heat exchange experiments among the ceramic balls at 90℃ and the air at room temperature, the convective heat exchange coefficient between the ceramic balls and the air was worked out and the value was about 291.3W/(m2?K). The heat transfer experiments of ceramic balls and biomass particles at the condition of ceramic balls’ mass flow rate were 1.0,1.2 and 1.4kg/min, mass ratio of ceramic balls and biomass particles were 15，20 and 25 respectively. The results indicate that the temperature variation of the biomass particles increases with the increase of ceramic balls mass flow rate and the mass ratio of ceramic balls and biomass particles.