RESEARCH ARTICLE


Depressurization System by Coiled Pipes Applied to a High Pressure Process: Experimental Results and Modeling



J. M. Benjumea*, J. Sánchez-Oneto, J. R. Portela, E. J. Martínez de la Ossa
Department of Chemical Engineering and Food Technologies, Faculty of Sciences Agro-food International Excellence Campus CeiA3, University of Cádiz, 11510 Puerto Real, Cádiz, Spain.


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© 2017 Benjumea et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Department of Chemical Engineering and Food Technologies, Faculty of Sciences Agro-food International Excellence Campus CeiA3, University of Cádiz, 11510 Puerto Real, Cádiz, Spain, Tel: +34956016411; E-mails: josemanuel.benjumea@uca.es, jmbentri@gmail.com


Abstract

Background:

The use of backpressure regulator valves is widespread in high-pressure processes both at laboratory and pilot plant scales, but being a single step for effluent depressurization, such valves may have some limitations at industrial scale. In an effort to improve the depressurization step, this work studies a system based on the pressure drop of a fluid that circulates through coiled pipes.

Method:

The equipment, based on three series of variable length coiled pipes, was installed to achieve depressurization of 240 bars in a SCWO pilot plant.

Results:

The experimental results were compared with those obtained by the modeling carried out using different friction factor correlations from the literature.

Conclusion:

Among all the correlations tested, the Lockhart–Martinelli correlation showed the best agreement with experimental data. However, it was necessary to obtain an appropriate C parameter to achieve a good agreement with experimental data.

Keywords: Coiled pipes, Depressurization step, Experimental tests, Modeling, Lockhart–Martinelli correlation, SCWO plants.