中文摘要：

下降管式热解液化装置能够实现生物质热解液化。为了研究下降管中生物质半焦和陶瓷球两种散体混合下落的换热规律,在前期研究的基础上,对实验设备进行了改进设计,并将原实验物料——生物质粉更换为生物质半焦,使实验结果对实际装置的设计与改进更具指导意义。根据不同温度陶瓷球（50、60、70℃）与室温空气的换热实验,通过热平衡分析,得到了陶瓷球热载体与空气的对流传热系数h=600 W/（m2.K）;陶瓷球与生物质半焦颗粒换热实验表明,不考虑边界效应时竖直管内温度呈线性分布;对流换热为竖直下降管系统热量传递的主要方式。

英文摘要：

The down-flow tube reactor was used for biomass pyrolysis liquefaction and proved effective. In order to study the characteristics of heat transfer between ceramic balls and biomass chars, an improved experimental platform of down-flow tube was designed based on the former research. In addition, the former experimental material biomass particles were replaced by chars, and the result of experiment would be indicative to the industry application. Based on the heat exchange experiment among the ceramic balls at different temperature （50, 60, 70℃ ） and the air at room temperature, by the analysis of thermal equilibrium, the convective heat exchange coefficent between ceramic bails and the air was worked out and the value was about 600 W/（m^2.K）. The result of heat transfer experiment between ceramic balls and chars shows that temperature in the vertical tube obeys linear rule as the edge effect is not considerd. The leading way of heat transfer in the down-flow tube is the convective heat exchange.