自国产锅炉机组向大容量,高参数发展以来,普遍存在着一个主蒸汽温度偏低,达不到设计值的问题。主汽温度偏低,无疑会降低汽轮发电机组的安全性和经济性。以125MW 汽轮发电机组为例,当其他蒸汽参数不变,主蒸汽温度偏离设计值时对经济性的影响,见表1。主蒸汽温度偏低,将使汽轮机末级叶片因湿度增大,工作条件恶化,而缩短使用寿命。因此提高主蒸汽温度使之接近或达到设计值,成为确保汽轮发电机组安全经济运行的重要课 Since the domestic boilers to large-capacity, high-parameter development, there is a widespread prevalence of the main steam temperature is low, less than the design value of the problem. Main steam temperature is low, will undoubtedly reduce the safety and economic turbine generator. Take 125MW turbine generator set as an example, when other steam parameters remain unchanged, the main steam temperature deviation from the design value of the economic impact, Table 1. The main steam temperature is low, will make the steam turbine last stage blades due to increased humidity, deterioration of working conditions, and shorten the service life. Therefore, raising the main steam temperature so that it approaches or reaches the design value becomes an important lesson for ensuring the safe and economical operation of the steam turbine generator set