Wet Gas Metering Based on Dual Differential Pressure of Long Throat Venturi Tube

In order to measure wet gas without separation,a wet gas measuring method of dual differential pressure based on a long throat Venturi tube is presented,and experiment is carried out.The regularity between the mass ratio of liquid to gas,the gas flow rates and the differential pressure of Venturi contraction and expansion sections is ac-quired by theoretical analysis and experimental research.The deficiency of the traditional overreading correlation is analyzed,and a principle of optimizing the overreading model is put forward.The gas and liquid flow rate metering model of a Venturi tube is obtained by experimental study,and the metering of the gas and liquid flow rates of wet gas is realized by iteration of the metering model.The experimental results show that the gas flow rates are measured within ±3%,and the liquid flow rates are measured within ±10% judged by full scale error,under the condition that the test pressure ranges from 0.10 MPa to 0.16 MPa,Froude number ranges from 0.4 to 0.7,and mass ratio of liquid to gas ranges from 0 to 1.