Wet gas metering based on dual-modality measurements by using frequencies of vortex shedding and disturbance wave
Aiming at the overreading problem of vortex wet gas metering,a new overreading correction and wet gas flow measurement method based on vortex meter-disturbance wave frequency dual-modality detection system were proposed. The conductance ring sensor was developed to obtain the liquid film flow parameters,the excitation module,acquisition module,demodulation module,and host computer program were designed,respectively. The sensor's sensitivity and linearity were enhanced through the optimization of parameters such as excitation frequency,electrode width,and electrode spacing. The real flow tests were conducted on various carried gas conditions (gas flowrate and pressure) and liquid loading conditions,analyzing how vortex over-reading and disturbance wave frequency change with different two-phase conditions. Finally,the meter overreading equation was established with disturbance wave Strouhal number and gas Weber number,and the wet gas measurement model was developed combined with Newton iteration algorithm. The model gives a prediction error of gas flow within±1.5％ (97.5％ confidence interval) with uncertainty of 0.75％. Compared with the error up to 12.1％ before overreading correction,the accuracy of wet gas metering is largely improved. The model utilizes the disturbance wave frequency for meter overreading correction without the need for liquid film thickness calibration,due to the low requirement for medium conductivity and fewer calibrated coefficients,thus enhancing the model's applicability and scalability effectively.
wet gas two-phase flowvortex flowmeterdisturbance wave frequencymeter overreadingflow measurement
万方数据
维普
