【摘要】 超(超)临界压力发电技术现在已经是成熟的技术,具有效率高、排放少、易于调峰、运行稳定的优点,是一次能源以煤为主的国家应大力发展的机组。但大多数机组存在水冷壁横向裂纹失效的问题,因此,有必要对这一问题进行深入研究。针对沁北发电厂600MW超临界压力锅炉膜式水冷壁,通过数值方法模拟了多种工况下水冷壁的温度场,分析了背火侧两个关键点的温差与向火侧危险点温度的关系,拟合出了关系式。此关系式可用于向火侧壁温的在线监测。文章还根据数值模拟结果对沁北电厂水冷壁管径的选择进行了评价。更多还原

【Abstract】 Ultra- and supercritical pressure electricity- generating units with the virtues of high efficiency, low emission, good load regulation and steady operation should be developed actively in the nations that have plenty coal resource. But much transverse cracking of water wall tube failure occur in many units. In-depth research is needed. In the paper, membrane water wall temperature fields of 600 MW supercritical boiler of Qinbei power plant were calculated out in many work condition by numerical method. From analysis of relation of the difference of two key points on backside and severe points on fireside, formula can be fitted. The formula can carry out on-line monitoring temperature of severe points. The paper also makes an opinion on the design of the water wall tube.更多还原