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在饱和蒸汽流量测量中,常常因温度压力的变化,使差压式流量计流量测量精度大大降低。其误差可达±30％。为了提高测量精度,我们自制一种专用温压补偿计算尺。由于饱和蒸汽的温度与压力存在着函数关系,而压力和重度又存在着单值函数关系。我们若忽略因操作工况的变化所引起的α、ε等参数的变化,那么,温压补偿,归根结蒂就是重度补偿。因此,我们可以得出实际流量G与流量计的示值G_0的关系式: G=(r/γ_oG_o)~(1/2)式中: G-实际流量 G_0-示值流量γ-实际重度γ-0-示值重度若令补偿系数K=(γ/γ_0)~(1/2) 则 G=K·G_0 基于上式,我们制作了一把专用计算尺(如附图所示)。
In the saturated steam flow measurement, often due to changes in temperature and pressure, differential pressure flowmeter flow measurement accuracy greatly reduced. The error of up to ± 30%. In order to improve the measurement accuracy, we made a special temperature and pressure compensation slide rule. Because of the saturated steam temperature and pressure there is a functional relationship, and pressure and severity there is a single-valued function. If we ignore the change of operating conditions due to changes in α, ε and other parameters, then the temperature and pressure compensation, in the final analysis is the heavy compensation. Therefore, we can draw the actual flow G and flow meter indication G_0 relationship: G = (r / γ_oG_o) ~ (1/2) Where: G-actual flow G_0-flow rate indication γ-actual γ -0- If the compensation coefficient K = (γ / γ_0) ~ (1/2) G = K · G_0 Based on the above formula, we made a special slide rule (as shown in the figure).