一次风机：提供一定压力、一定流量的一次风，将煤粉干燥并送入喷燃器，提供煤粉挥发分燃烧所需的氧气。
这会增加一次风机的尺寸而减小从动风扇的尺寸。
This increases the initial primary air fan size and reduces the forced draft fan sizes.
提出了有效床存量的概念、床压控制的原则、一次风机压头选择的依据。
The concept of effective bed inventory, the principle of bed inventory control and the selection theory of primary fan pressure are suggested.
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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