工业锅炉过热器安全性分析及壁温计算软件的开发

Analysing Superheater Safety and Developed Software Calculating Tube Wall Temperature for Industrial Boilers

低中压工业锅炉过热器管子内壁向蒸汽的放热系数往往低于1000～1200W／（m^2℃），甚至低到500～600 W（m^2·℃），加之为适应锅炉大范围变工况，必需加大单级过热器的蒸汽焓增，从而使管壁温度与蒸汽温度之差大于100℃。列举出3个算例，算例应用了所开发的壁温计算软件，其中D型油炉的管壁——蒸汽温差高达275℃。

For industrial boilers operating on middle or low pressure region, one hand heat coefficient from inside wall of superheater tube to steam is usually less than 1000 - 1200 W/（ m^2·℃ ）, even to 500 - 600 W/（ m^2 ·℃ ） ; other hand steam enthalpy augment in a single section of superheater must be increased because of widing variable condition, so the temperature difference between tube wall and steam may often be higher than100℃. Three calculation examples are written using the developed software, for one oil -fired boiler the temperature difference is extremely up to 275℃.