作　　者： ; ; ; ; ;

机构地区： 华北水利水电学院电力学院

出　　处： 《动力工程》 2009年第8期707-712,721,共7页

摘　　要： 建立了超超临界锅炉垂直管圈膜式水冷壁温度场的计算模型,采用有限容积法进行温度场数值计算及程序设计,并针对玉环电厂1000 MW超超临界直流锅炉变压运行的实际工况,对其垂直管圈膜式水冷壁的温度场进行了计算及分析,为超超临界直流锅炉垂直管圈水冷壁的设计及运行监测提供了可靠的理论依据.计算结果表明:在不同负荷下,膜式水冷壁截面的炉膛向火侧温度最高,在低负荷时向火侧管外壁温度最高,而在高负荷时向火侧鳍端温度最高;在最低直流负荷下,管外向火侧外壁温和内壁温沿管子高度方向均没有发生壁温飞升;在不同负荷下,水冷壁管截面最大温差及管截面最高温度均低于水冷壁金属容许的温度值;在锅炉启动及运行时,应监测膜式水冷壁向火侧管外壁的温度和鳍片温度. Calculating model for temperature fields of vertical membrane waterwall in ultra-supercritical boilers was developed. The finite volume method was adopted for the numerical calculation and program design of the temperature fields. The temperature fields of the vertical membrane waterwall was calculated and analyzed according to the actual operational conditions of the 1 000 MW ultra-supercritical oncethrough boiler with variable pressure operation in Yuhuan Power Plant, which offers reliable theoretical basis for the design and operation monitoring of the vertical membrane waterwall in ultra-supercritical once-through boiler. The calculation results indicate that under different loads, the highest temperature of membrane waterwall occurs at the side facing the flame. And under low load, the highest temperature occurs at the outer wall facing the flame, while under high load, the highest temperature occurs at the fin ends facing the flame. Under the lowest load, the temperature of the outer wall facing the flame and the inner wall didn＇t rise steeply along the height of the tube. The maximum temperature difference and the highest temperature in the cross section of waterwall are lower than the allowed temperature of the metal under different load. During the start up and operation of the boiler, the temperature of the outer wall facing the flame and the temperature of the fin should be monitored.

关 键 词： 超超临界锅炉 膜式水冷壁 温度场 数值计算

领　　域： [动力工程及工程热物理]