Exergy analysis of process heaters


Sahin A. Z. , Zubair S. M.

INTERNATIONAL JOURNAL OF EXERGY, vol.7, no.4, pp.505-520, 2010 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 7 Issue: 4
  • Publication Date: 2010
  • Doi Number: 10.1504/ijex.2010.033416
  • Journal Name: INTERNATIONAL JOURNAL OF EXERGY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.505-520
  • Keywords: exergy, exergy efficiency, process heater, second law of thermodynamics
  • Istanbul Technical University Affiliated: No

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.