Title: Exergy analysis of process heaters

Authors: Ahmet Z. Sahin, Syed M. Zubair

Addresses: Mechanical Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia. ' Mechanical Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia

Abstract: A thermodynamic analysis is proposed to investigate the entropy generation in process heaters. It is found that the major portion of the exergy losses occur in the stack. It is also found that the excess air decreases the first law efficiency while the second law efficiency remains nearly constant. Although the first law efficiency is found to be of the order of 70-90%, the second law efficiency has been calculated to be low, in the range of 30-40%. In this regard, stack gas temperature is found to be an important parameter for improving the second law efficiency.

Keywords: exergy analysis; exergy efficiency; process heaters; second law of thermodynamics; entropy generation; stack gas temperature.

DOI: 10.1504/IJEX.2010.033416

International Journal of Exergy, 2010 Vol.7 No.4, pp.505 - 520

Received: 17 Feb 2009
Accepted: 20 Sep 2009
Published online: 02 Jun 2010 *

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