管内相分隔状态下电磁流量计测量气液两相流的方法

Gas-liquid two-phase flow measurement by electromagneticflowmeter under phase-isolation state

针对电磁流量计测量气液两相流时测量精度和稳定性易受流型影响的问题,提出了一种管内相分隔状态下基于电磁流量计的气液两相流测量方法。利用旋流器将不规则的两相流入口流型整形成气芯-水环的对称型环状流,保证了权函数的有序分布,并引入空隙率修正了电磁流量计测量模型,提高了电磁流量计的测量精度。利用空气-水两相流为介质,通过室内实验对该测量方法进行了验证,结果表明,在管内相分隔状态下,电磁流量计的液相测量相对误差在±5%以内。研究结果为工业生产中的气液两相测量提供了一种很好的思路和方法,具有良好的应用价值。

Aiming at the problem that the measurement accuracy and stability of the electromagnetic flowmeter are easily affected by the flow pattern when measuring the gas-liquid two-phase flow,this paper proposes a gas-liquid two-phase flow measurement method using the electromagnetic flowmeter under phase-isolation state.A cyclone was used to shape the irregular two-phase flow inlet flow pattern into a gas core-water ring flow,ensuring the orderly distribution of the weight function.Void fraction was introduced to modify the electromagnetic flowmeter measurement model to improve the measurement accuracy.Using air-water two-phase flow as the medium,the measurement method was verified through laboratory experiments.The results show that the liquid phase measurement error of the electromagnetic flowmeter is within±5%under phase-isolation state.The research conclusions of this paper provide a good idea and method for gas-liquid two-phase measurement in industrial production,and have good application value.