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Desalination and Water Treatment Volume 51, 2013 - Issue 7-9
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Articles

Thermodynamic analysis of a cogeneration gas turbine and desalination plant

A. Al Zahrani Department of Mechanical Engineering, College of Engineering, King Saud University, P.O. Box 800, 11421, Riyadh, Saudi Arabia Phone: Tel. +966 1 467 9798 Fax: Tel. +966 1 467 9798
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J. Orfi Department of Mechanical Engineering, College of Engineering, King Saud University, P.O. Box 800, 11421, Riyadh, Saudi Arabia Phone: Tel. +966 1 467 9798 Fax: Tel. +966 1 467 9798Correspondence[email protected]
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H. Al Ansary Department of Mechanical Engineering, College of Engineering, King Saud University, P.O. Box 800, 11421, Riyadh, Saudi Arabia Phone: Tel. +966 1 467 9798 Fax: Tel. +966 1 467 9798
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B. Salim Department of Mechanical Engineering, College of Engineering, King Saud University, P.O. Box 800, 11421, Riyadh, Saudi Arabia Phone: Tel. +966 1 467 9798 Fax: Tel. +966 1 467 9798
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Z. Al Suhaibani Department of Mechanical Engineering, College of Engineering, King Saud University, P.O. Box 800, 11421, Riyadh, Saudi Arabia Phone: Tel. +966 1 467 9798 Fax: Tel. +966 1 467 9798
Pages 1908-1914 | Received 20 Mar 2012, Accepted 18 Jul 2012, Published online: 11 Sep 2012
 
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Abstract

This work deals with a thermodynamic analysis of the performance of a cogeneration gas turbine and thermal desalination plant. A heat recovery steam generator links the two units together. The analysis is based on the application of mass, energy and exergy balances on the whole cogeneration plant as well as on each of its components. The analysis is also based on an accurate evaluation of the seawater properties, which leads to correct calculations of the flow exergy and exergy efficiency of any component of the desalination plant. The main results of the study concern the influence of the pressure ratio of the compressor and the turbine inlet temperature on the exergy efficiency of the gas turbine and the whole combined system. It was found in particular that as the performance ratio of the desalination plant increases the specific exergy destruction rate decreases.

Acknowledgement

The authors would like to thank the National Plan for Science & Technology (NPST) programme and King Saud University for funding the research reported in this paper through the project number (08-ENE340-2).

Notes

Presented at the International Conference on Desalination for the Environment, Clean Water and Energy, European Desalination Society, 23–26 April 2012, Barcelona, Spain

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