关于蒸汽管道压降的计算,以往我国火电厂设计中,只考虑了比容变化(求平均比容)对摩损的影响,忽略了对动压的改变,这显然是有误差的。本文从能量方程、质量方程出发,按热力学、流体力学和近似计算的一些原理,较详细地推导了火电厂常用蒸汽管道的各压降计算公式,所得公式与苏联近年来采用的公式基本相同,有些公式的精度还略高。 With regard to the calculation of steam pipe pressure drop, in the past, the design of thermal power plant in China only considered the influence of specific volume change (average specific volume) on wear loss, neglecting the change of dynamic pressure, which is apparently erroneous. Based on the principles of thermodynamics, fluid mechanics and approximate calculation, this paper deduces the formulas for calculating the pressure drop of steam pipe commonly used in thermal power plants. The formulas obtained are basically the same as those adopted by the Soviet Union in recent years. Some formulas are slightly more accurate.