涡轮薄层污泥干化的热质传递过程与关键参数研究

涡轮薄层污泥干化是涉及导热、对流传热与传质、高速旋流相耦合的复杂过程，掌握污泥的耦合干化机理与规律、确定干化设备核心参数，是该技术成功应用的关键。本文用机理分析方法构建涡轮薄层干化过程传热、传质的数学模型，基于该模型对污泥干化过程开展数值模拟，揭示涡轮薄层干化过程单一气相和气固两相流的速度、温度和含水率的分布规律，探究涡轮薄层干化的关键技术及参数。设计开发涡轮薄层污泥干化系统并开展实验研究。结果表明：干化机内部的桨叶阵列设计能够实现物料的顺利运输，桨叶末端是干化机内混合传热效果最佳位置，最优桨叶安装角度为45°,出口污泥含水率可降至20%。

Study on Heat and Mass Transfer Process and Key Parameters of Turbine Thin Layer Sludge Drying

The drying of turbine thin layer sludge is a complex process which involves the coupling of heat conduction, convective heat transfer and mass transfer and high speed swirling flow.The key to the successful application of this technology is to master the coupling drying mechanism and rule of sludge and determine the core parameters of drying equipment.In this paper, the mathematical model of heat and mass transfer in the thin layer drying process of turbine was built by method of mechanism analysis.Based on this model, the numerical simulation of the sludge drying process was carried out to reveal the distribution rule of velocity, temperature and water content of single gas phase and gas solid two phase flow in turbine thin layer drying process.The key technologies and parameters of the thin layer drying process of turbine were explored.The turbine thin layer sludge drying system was designed and developed, and experimental research was performed.The results show that the blade array design of dryer can realize the smooth transportation of materials.The end of the blade is the best position for mixing heat transfer in the dryer.The optimal blade installation angle is 45°.The water content of outlet sludge can be reduced to 20%.