【摘要】 针对林州热电厂350MW超临界锅炉水冷壁温度特性,采用有限容积法对矩形鳍片膜式水冷壁进行温度场分布的数值计算,分析了炉膛下部螺旋管圈的温度分布特性.计算研究表明:螺旋管圈水冷壁温度随着炉膛高度的升高而增大,最高温度出现在水冷壁向火侧或者鳍端,最高温度小于440℃,低于金属许用温度;随着锅炉负荷的升高,管壁最高温度及周向最大温差显著增大.在炉膛宽度上,各管间温度差、焓值差及亚临界压力下的干度差均很小,但其值随着热负荷的增大而增大,表明螺旋管圈水冷壁可有效消除热偏差.更多还原

【Abstract】 In view of the temperature characteristics of water wall in 350MW supercritical pressure boiler of Linzhou thermal power plant,the temperature fields of rectangular fins water wall were numerically studied by the finite volume method,and the spiral membrane water-wall temperature in the lower furnace was analyzed.According to the calculation results,temperature of spiral water-walls increases with the increase of the height of furnace.The highest temperature,which occurs at the facing flame outer of water wall tube or the fin’s end,is less than 440 ℃ and does not exceed the permitted value of the metal.Both the highest temperature and the maximum temperature difference increase with increasing the furnace load.As the thermal deviation can be effectively reduced by using spiral water-wall,the temperature of water-walls and the temperature difference of working medium between each tube are very small along the width direction of the furnace.更多还原