考虑辐射热流非均匀分布的蒸发过程模拟分析  

SIMULATION ANALYSIS OF THE VAPORIZING PROCESS WITH CONSIDERING NONUNIFORM DISTRIBUTION OF RADIATIVE HEAT FLOW

作　　者：朱志武[1] 周怀春[1] 

机构地区：[1]华中科技大学,湖北武汉430074

出　　处：《热力发电》2003年第11期53-57,共5页Thermal Power Generation

基　　金：教育部高等学校优秀青年教师教学科研奖励计划 (1 999年度 )资助

摘　　要：提出用非均匀辐射热流分布参数的处理方法对上升管的蒸发过程进行模拟分析。在炉内三维温度非均匀分布的情况下 ,辐射热流在水冷壁表面是非均匀分布的。为此 ,把上升管沿宽度和高度方向分别进行分区模拟。采用非均匀辐射热流分布参数的处理方法 ,分析上升管内蒸发过程沿高度的变化情况 ,其结果比采用集总参数法和均匀辐射热流分布参数的处理方法更加合理。用该处理方法得到的结果判断可能会发生局部传热恶化和倒流的异常管 ,对于锅炉安全。Simulation analysis of the vaporizing process in riser tubes of a boiler has been carried out on the basis of a processing method with considering nonuniform distribution parameters of radiative heat flow. Under condition of the nonuniform 3D distribution of furnace temperature, the radiative heat flow transferred to the surface of waterwall tubes is also nonuniform. For this reason, the waterwall surface has been divided into small simulation zones along directions of height and width of riser tubes, and the variation of the vaporizing process within the riser tubes along height direction has been analysed by using the abovementioned processing method. The results obtained are more reasonable compared with that obtained from the traditional lumped parameters method and the uniform radiative heat flow distribution method. By using the results obtained from the said processing method, occurrence of abnormal tubes with worsened heat transfer locality and back ward flow can be determined, having important significance for analysing safe and economic operation of boilers.

关 键 词：锅炉 上升管 汽水系统 辐射热流 非均匀分布 蒸发过程 模拟分析 

分 类 号：TK223.11[动力工程及工程热物理—动力机械及工程] TK224.13