V锥流量计湿气流量测量新模型

A New Model for Wet Gas Flow Measurement with V-Cone Meter

针对V锥流量计在测量湿气时产生的虚高问题,提出用V锥流量计的两相流量系数来进行修正。采用节流比为0.75的V锥,在压力为0.10～0.22MPa、气相流量为100～300m3.h-1、液相流量为0～0.08m3.h-1的实验条件下,研究了Lockhart-Martinelli(L-M)参数、压力及气体密度弗鲁德数对V锥两相流量系数的影响。结果表明,两相流量系数与L-M参数呈良好的线性关系,线性斜率受气体密度弗鲁德数和压力的影响。获得了两相流量系数与L-M参数、气体密度弗鲁德数和压力的拟合关联式,并建立了基于两相流量系数的湿气测量模型。在95%的置信水平下,新模型的气相流量测量相对误差小于±5%。

The two-phase flow coefficient of a V-cone meter was proposed to correct the ＂over-reading＂ produced by measuring the wet gas using the V-cone meter.The experiment was conducted with the V-cone meter with a diameter ratio of 0.75 for air and water.The test pressure ranged from 0.10 MPa to 0.22 MPa,and the gas and liquid mass flow rates were from 100 m3·h-1 to 300 m3·h-1 and from 0 to 0.08 m3·h-1,respectively.The effects of the Lockhart-Martinelli parameter,the operating pressure and the gas densiometric Froude number on the two-phase flow coefficient were investigated.The results show that the two-phase flow coefficient increased linearly with the Lockhart-Martinelli parameter,and the slope of the two-phase flow coefficient vs.the Lockhart-Martinelli parameter was affected by the gas densiometric Froude number and the pressure.The correlation between the two-phase flow coefficient and the Lockhart-Martinelli parameter,the gas densiometric Froude number and the pressure was obtained.On the basis of the two-phase flow coefficient,the wet gas model was developed.The relative error of the gas mass flow rate predicted by the model is within ±5.0% at the 95% confidence level.