高温热载体加热生物质的传热过程

Heat Transfer From High-temperature Solid Media to Biomass

根据热载体陶瓷颗粒和生物质粉混合物在倾斜管中流动的两种极限情况,分别建立了平推流和充分混合流传热模型,在热载体初始温度为773K,载体和生物质质量比为20,载体粒直径为2.5mm,环境温度为293K条件下,用两种模型计算表明:完成95％的热量传递所需的时间分别为0.490和0.085s,生物质粉平均升温速率介于841～4850K/s.

A sliding model and a fully developed model are used to describe the heat transfer from ceramic micro-beads to biomass for optimizing operation parameters according to the flow state of mixture in inclined tube. Calculation results show that the heating rate of biomass is between 841 and 4 850K/s when the initial temperature of ceramic beads is 773K, the mass ratio of ceramic beads to biomass is 20, and the diameter of ceramic beads is 2. 5mm.