一、概述当今，利用烟气中水蒸汽潜热已被公认为提高燃气锅炉运行效益的主要途径之一。燃气电站蒸汽锅炉和热水锅炉，它们的排烟温度大致在11O℃至14O℃范围以内。借省煤器把排烟温度进一步降低，按技术经济计算结果是不合算的，在这种情况下，排烟的干物理热损失为4％～5％。 I. Overview Today, the use of latent heat of water vapor in flue gas has been recognized as one of the main ways to improve the operating efficiency of gas-fired boilers. Gas-fired steam boilers and hot water boilers, their exhaust temperature is roughly in the range of 11O ℃ to 14O ℃. By economizer to further reduce the exhaust gas temperature, according to the technical and economic calculation results are uneconomical, in this case, the exhaust heat of the physical heat loss of 4% to 5%.