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近年来在研究试验中观察到,超高压和亚临界锅炉省煤器出口水温只有260℃～290℃,比饱和温度低60～90℃,其欠(?)为100～125大卡/公斤。这是由于随着蒸汽压力的增加,锅水的饱和温度升高,而汽化潜热与给水在锅炉中加热至饱和蒸汽所需热量的比值变小(表1),然而工质在炉膛水冷壁中吸热的比例则与压力无关,主要取决于燃料在炉膛中的放热量,即决度于理论燃烧温度与炉膛出口温度的差值。因而一般锅炉压力越高,工质在炉膛水冷壁中
In recent years, it has been observed in research trials that the water temperature at the economizer outlet of EHV and subcritical boilers is only 260-290 ℃, which is lower than the saturation temperature by 60-90 ℃. The deficit (?) Is 100-125 kcal / kg. This is due to the fact that as the steam pressure increases, the saturation temperature of the boiler water rises and the ratio of the latent heat of vaporization to the amount of heat required to heat the feedwater to the saturated steam in the boiler becomes smaller (Table 1), whereas the working fluid is in the waterwall of the hearth The ratio of endothermic pressure has nothing to do with the pressure, depending on the fuel in the furnace heat release, which is determined by the theoretical combustion temperature and furnace outlet temperature difference. Thus the higher the general pressure boiler, working fluid in the water wall in the furnace