针对烟气换热器壁面温度会低于排烟露点的情况，提出了正压通风燃气锅炉排烟热能利用系统。

Aimed at the fact that the wall temperature of heat exchanger is lower than the dew point of flue gas, the thermal energy utilization system for flue gas of positive draft gas boiler is proposed.

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分析了大型锅炉正压冷一次风机选型及运行优化要点，指出煤种和空预器漏风率是影响一次风机选型的主要因素。

In this paper the selection and optimum of operation of the pressure type cold primary air fan in large boiler were analyzed.

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