余热利用集热器性能的实验研究与数值计算

Experimental research and numerical analysis of heat collector performance for waste heat recovery

以回转窑表面余热回收用集热器为研究对象,采用实验研究和数值计算方法,分析了集热器的流动和传热特性及其在线运行规律。实验中选取了一种辐射型和两种耦合型结构的集热器进行研究,分析了出口水温、出口压力和工质流量的变化对集热器性能的影响,总结了三种结构类型的集热器在换热量上的变化规律。采用Matlab软件编程进行数值求解,将数值计算结果与实验结果对比,验证了数值计算的准确性。数值分析了入口空气温度、入口空气流速和窑体温度变化时对应的集热器内熵增、火积耗散以及有效度的变化规律。相关计算结果为集热器的优化设计和在线运行参数的选择提供了数据支持。

The research object is a novel heat collector installed on the surface of the rotary kiln, which is used for waste heat recovery from the kiln. The experimental and numerical calculation methods are used to analyze the flow and heat transfer characteristics of this equipment. In the process of experimental research, one radiant type heat collector and two coupled type heat collectors are investigated to study the influence between the variation of outlet water temperature, outlet pressure and flow mass on the performance of the collector. Numerical calculations are also performed to obtain working performances of the heat collector using Matlab software. Both numerical and experimental results are compared to verify the accuracy of numerical calculations. The changes of the inlet air temperature, inlet air flow rate and kiln body temperature are numerically analyzed. Related results provide data support for the optimization design of the collector and the selection of the online operating parameters.