Online measurement of gas and liquid flow rate in wet gas base on single v-cone throttle

The two-phase mass flow coefficient is proposed to correct the deviation of the V-Cone meter when it is used to measure the wet gas. The effects of the Lockhart-Martinelli parameter, the gas densiometric Froude number and the gas to liquid density ratio on the two-phase flow coefficient are experimentally investigated. The diameter ratio of the V-Cone meter is 0.55. The experimental fluids are air and tap water. The gas to liquid density ratio, the gas densiometric Froude number and the Lockhart-Martinelli parameter range from 0.002 445 to 0.006 083, from 0.3 to 2.0 and from 0.01 to 0.34, respectively. The results show that the two-phase mass flow coefficient linearly increases with the Lockhart-Martinelli parameter and is affected by the gas densiometric Froude number and the gas to liquid density ratio. Then the quantitative relationship between the two-phase mass flow coefficient and the Lockhart-Martinelli parameter, the gas densiometric Froude number and the gas to liquid density ratio is obtained, based on which the correlation for the wet gas flow measurement is developed. The differential pressure response of the front and back cone of the V-Cone to the wet gas is investigated and the parameters affecting the different responses are also discussed, and finally the wet gas correlation to meter the gas and liquid mass flow rate is concluded. In the present cases, the relative error of the gas mass flow rate predicted by the correlation is within ±5.0% and the average relative error is 2.2%; the relative error of the liquid mass flow rate predicted by the correlation is within ±20.0% and the average relative error is 9.8%. The method proposed in this study possesses some remarkable performances, including simple structure, low cost and high accuracy.