非均质移动颗粒床的渗流换热模型与数值模拟

针对非均质移动颗粒床的换热过程，建立了其渗流换热的数学模型，提出了COADI-GS算法，采用此算法对移动颗粒床的气固换热过程进行流热耦合数值模拟。通过对均质与非均质这两种不同移动颗粒床换热模型的仿真结果进行比较，发现两者的床内温度分布有较大差异，非均质移动颗粒床模型能更为准确地描述床层内的渗流换热过程。计算结果表明，供风压力的增加虽有利于熟料颗粒的冷却，但会降低回收风的温度；颗粒温度随床层移动速度的增加而升高，近似为线性关系。

Seepage heat transfer model and numerical simulation for heterogeneous moving particulate bed

For heat transfer process in a heterogeneous moving particulate bed, a mathematical model for the seepage heat transfer process was established. The COADI-GS algorithm was proposed to solve thermally coupled flow of gas-solid heat transfer process numerically. The comparison for the simulation results on the heat transfer models for homogeneous and heterogeneous moving beds demonstrates that the temperature distributions in the two beds are quite different and the model for the heterogeneous moving particulate bed is more accurate for the seepage and heat transfer process in the bed. The results show that the increase of wind pressure is conducive to the cooling of clinker particles, but it may reduce the temperature of recovered wind. The particle temperature increases with the moving speed almost linearly.