冬季取暖用锅炉的蒸汽压力变化较大。若采用标准孔板测量饱和蒸汽流量,一般要进行压力修正。由节流装置基本公式可知,测量结果的准确性决定于孔板流量系数α、流束膨胀系数ε、节流件直径d及蒸汽密度ρ的稳定性。当饱和蒸汽压力偏离设计值时,这几个参数都发生变化,其中ρ变化最大,d变化较小。实际应用中,在流量不变的情况下,常将a和d变 Winter heating boiler steam pressure greater changes. If the standard orifice plate to measure saturated steam flow, pressure correction is generally required. According to the basic formula of the throttling device, the accuracy of the measurement result is determined by the stability of the orifice flow coefficient α, the beam expansion coefficient ε, the diameter d of the throttling member and the density ρ of the steam. When the saturated steam pressure deviation from the design value, these parameters have changed, where ρ changes the most, d small changes. Practical applications, the same flow in the case, often a and d change