Measurement of the Gas Phase Velocity in Gas-Liquid Flows Using a Dual-Plane ERT System

X. Deng, F. Dong, L. J. Xu, X. P. Liu, L. A. Xu

School of Electrical Automation & Energy Engineering, Tianjin University, Tianjin 300072, P. R. China Phone 86-22-27407641 Fax 86-22-87893360

E-mail: xiangdeng@263.net

ABSTRACT

Combining electrical resistance tomography (ERT) with cross-correlation flow measurement technique more information of the flow can be provided than usual. Based on this idea a dual-plane ERT system for use on laboratory- and plant-scale process equipment was developed by the authors. This paper focused on discussion measurement of local gas velocity in a gas / liquid two-phase pipe flow basing on dual plane ERT system signals cross-correlation. Methods to improve the real-time performance of ERT system were discussed in detail. Criteria to select the distance from up-stream plane to down- stream and data collection protocol were described. In the meantime the experimental results and analysis were also presented.

Keywords Tomography, cross-correlation, velocity measurement, gas/liquid flow