Mass flowrate measurement of wet steam using combined V-cone and vortex flowmeters

摘要

The accurate measurement of wet steam has great significance for energy conservation and sufficient utilization. However, subject to the complex flow characteristics of vapor steam and discrete droplets, there are many problems in wet steam metrology. A dual-parameter model combining V-cone and vortex flowmeters was proposed to calculate mass flowrate of wet steam. The vapor mass flowrate is obtained by vortex meter coefficient and vapor density; its over-reading is obtained by the measured V-cone two-phase differential pressure and vapor density. The ratio of these two results was defined as over-reading factor. The correlation between over-reading factor and Lockhart Martinelli parameter is established by calibration experiments to get the dryness and the mass flowrate of wet steam. The proposed wet steam meter predicts the wet steam mass flowrate within the accuracy of ±6% from 95% tested samples, which indicates the efficiency of the proposed approach was validated.