Jia, J, Wang, M, Faraj, Y et al. (1 more author) (2015) Online conductivity calibration methods for EIT gas/oil in water flow measurement. Flow Measurement and Instrumentation, 46 (B). pp. 213-217. ISSN 0955-5986
Abstract
Electrical Impedance Tomography (EIT) is a fast imaging technique displaying the electrical conductivity contrast of multiphase flow. It is increasingly utilised for industrial process measurement and control. In principle, EIT has to obtain the prior information of homogenous continuous phase in terms of conductivity as a reference benchmark. This reference significantly influences the quality of subsequent multiphase flow measurement. During dynamic industrial process, the conductivity of continuous phase varies due to the effects from the changes of ambient and fluid temperature, ionic concentration, and internal energy conversion in fluid. It is not practical to stop industrial process frequently and measure the conductivity of continuous phase for taking the EIT reference. If without monitoring conductivity of continuous phase, EIT cannot present accurate and useful measurement results. To online calibrate the electrical conductivity of continuous phase and eliminate drift error of EIT measurement, two methods are discussed in this paper. Based on the linear approximation between fluid temperature and conductivity, the first method monitors fluid temperature and indirectly calibrates conductivity. In the second method, a novel conductivity cell is designed. It consists of a gravitational separation chamber with refreshing bypass and grounded shielding plate. The conductivity of continuous phase is directly sensed by the conductivity cell and fed to EIT system for online calibration. Both static and dynamic experiments were conducted to demonstrate the function and accuracy the conductivity cell.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2015, Elsevier. This is an author produced version of a paper published in Flow Measurement and Instrumentation. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | EIT; Online conductivity calibration; Flow measurement |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) > Institute for Particle Science and Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 16 Oct 2015 11:48 |
Last Modified: | 02 Jul 2016 08:55 |
Published Version: | http://dx.doi.org/10.1016/j.flowmeasinst.2015.07.0... |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.flowmeasinst.2015.07.002 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:88905 |