通常只允许主蒸汽温度比额定温度高5℃左右。当主蒸汽温度升高时，主蒸汽在

通常只允许主蒸汽温度比额定温度高5℃左右。当主蒸汽温度升高时，主蒸汽在汽轮机内的总焓降、汽轮机相对的内效率和热力系统的循环热效率都有所提高，热耗降低，使运行经济效益提高，但是主蒸汽温度升高超过允许值时，对设备的安全十分有害。

通常只允许主蒸汽温度比额定温度高5℃左右。 当主蒸汽温度升高时，主蒸汽在汽轮机内的总焓降、汽轮机相对的内效率和热力系统的循环热效率都有所提高，热耗降低，使运行经济效益提高，但是主蒸汽温度升高超过允许值时，对设备的安全十分有害。

Generally, the main steam temperature is only allowed to be about 5 ℃ higher than the rated temperature. When the main steam temperature rises, the total enthalpy drop of the main steam in the steam turbine, the relative internal efficiency of the steam turbine and the circulating thermal efficiency of the thermal system are all improved, the heat consumption is reduced, and the economic benefit of operation is improved. However, when the main steam temperature rises beyond the allowable value, it is very harmful to the safety of the equipment.<br>