Wet Gas Measurement Model for Low Pressure Applications in Horizontal Orientated Venturi Tube

LUO Yi  ZHANG Tao  FANG Lide

(School of Electrical and Automation Engineering, Tianjin University, Tianjin 300072)

Abstract: In the background of low pressure condition, over reading mathematics models of Venturi tube on wet gas measurement is studied, both in theory and in experiment. Firstly, a theoretical model is deduced from the momentum equation; then, lots of experiment is done on three Venturi tubes which are different in size, the meters, with β values of 0.404 8, 0.55 and 0.70 have been tested in Tianjin University’s Low Pressure Wet Gas Test Facilities. The effect of pressure, slip ratio and liquid ratio to over reading of venture wet gas metering is analyzed, and a new half-experiential model of Venturi tube on wet gas measurement is put forward and proved in good precision; Finally, experiment analyzing shows that signal of the Venturi tube whose diameter ratio is 0.55 scatters least.

Key words: Venturi tube  Wet gas measurement  Two-phase flow  Stratified flow model  Over reading

CLC No: TH814

国家高技术研究发展计划资助项目(863计划，2006AA042167). Received 20070121, received in revised form 20070812