Abstract:

With a homemade gas-solid heat transfer experimental setup, an experimental study was conducted on gas-solid heat transfer characteristics in a packed bed with sinter particles. The results show that the main factors affecting the gas-solid heat transfer process in sinter bed layer are gas superficial velocity and sinter particle diameter. With the increase of gas superficial velocity and the decrease of sinter particle diameter, the gas-solid heat transfer coefficient increases in the sinter bed. For given gas superficial velocity and sinter particle diameter, higher sinter particle temperature in the bed gives higher gas-solid heat transfer coefficient and lower Nusselt number of heat transfer. Due to the large calculation error, the existing prediction correlations are not suitable for the gas-solid heat transfer process in sinter bed. Based on the method of dimensional analysis, an experimental correlation for describing the gas-solid heat transfer characteristics in sinter bed is obtained by fitting the experimental data, and its mean deviation from experimental data is 4.22%, giving good prediction.

Key words: sintering, packed bed, vertical tank, porous media, heat transfer coefficient

摘要：

以自制气固传热实验装置为操作平台,实验研究了烧结矿颗粒填充床内的气固传热特性。结果表明:气体表观流速和烧结矿颗粒直径是影响颗粒床层内气固传热过程的主要因素。气体表观流速越大,颗粒直径越小,床层内气固传热系数就越大。当烧结矿颗粒直径和气体表观流速一定时,床层内烧结矿颗粒温度的升高导致床层气固传热系数的增加和传热Nusselt数的减小。由于计算误差较大,现有的经验关联式不适用于求解烧结矿颗粒床层内的气固传热过程。基于量纲分析法,并结合实验测量数据拟合得出了能够描述烧结矿颗粒床层内气固传热特性的实验关联式,平均计算误差为4.22%,显示了良好的预测性能。

关键词: 烧结, 填充床, 竖罐, 多孔介质, 传热系数