锅炉水冷壁数学模型研究

Study on the Mathematical Model of Boiler Water Wall

水冷壁数学模型是锅炉水冷壁动态特性研究的关键。在分析和总结前人研究成果的基础上,将锅炉的水冷壁数学模分为固定边界法和移动边界法两大类。重点介绍了移动边界法数学模型,对采用Lagrange流体质点追踪思想的移动边界法、采用非线性集总参数的移动边界法和基于热量节点与流量节点的移动边界法数学模型的特点和基本计算方法进行了比较,指出了各种方法的优缺点。

Mathematical model of water wall is the key to the study of boiler dynamic characteristics. According to the analysis and summary of the previous studies, the mathematical model of boiler water wall is divided into two kinds, which are fixed boundary method and moving boundary method. This paper is focus on the introduction of the moving boundary method. Three typical moving boundary models, which are the model based on the Lagrange motion coordinate system, the model based on multi subsections and lumped-parameter moving boundary method, the model based on heat nodes and flow nodes, were compared and analyzed. The advantages and disadvantages of each models were indicated.