高温流化床中埋管传热控制热阻的试验研究

An Experimental Study of Embedded Tube Heat Transfer and Heat Resistance Control in a Hightemperature Fluidized Bed

本文给出并分析了高温流化床中水平埋管的表面温度及粉末床料对埋管外侧传热系数影响的实验结果。结果表明，传热系数与表面温度密切相关，但相关程度取决于颗粒粒径及筛分范围。填加粉末床料使传热系数增大，但增大的幅度也与控制热阻有关。

Presented and analysed in this paper is the surface temperature of a horizontally embedded tube in a high-temperature fluidized bed and the experimental result regarding the effect of power bed material on the embedded tube outer side heat transfer coefficient.It has been shown that the heat transfer factor is closely related to the surface temperature,but the degree of correlation depends on the particle diameter and sieve range adopted.The adding of powder bed material will lead to an increase in heat transfer coefficient,but the degree of increase is also related to the controlled heat resistance.