Energy and exergy analyses of a cogeneration unit in an oil refinery: a case study
by Luiz Fernando Rodrigues Ferreira; Waldyr Luiz Ribeiro Gallo
International Journal of Exergy (IJEX), Vol. 38, No. 2, 2022

Abstract: This case study performed energy and exergy analyses of a cogeneration plant in an oil refinery, generating 97.8 MW of electrical power and 885 t/h of steam at 485°C and 91 bar to identify strategies for real-time decision-making. The exergy efficiencies of the gas turbine and steam turbine were 31.6% and 66.3%, respectively; however, the former should be privileged for load allocation because the condensation route in the steam turbine (3.88 kW/kW) is more irreversible per unit of electric power than the gas turbine (3.16 kW/kW). Exergy efficiency was higher in gas turbine heat-recovery boilers (50.65% and 42.84%) than in conventional boilers (39.51%), and a higher mass of steam should be obtained from the former, given their lower consumption of exergy per unit of mass of steam. Exergy analysis and industrial exergy indicators can well predict marginal efficiency and can be used in decision making.

Online publication date: Wed, 29-Jun-2022

The full text of this article is only available to individual subscribers or to users at subscribing institutions.

 
Existing subscribers:
Go to Inderscience Online Journals to access the Full Text of this article.

Pay per view:
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.

Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Exergy (IJEX):
Login with your Inderscience username and password:

Username:        Password:          Forgotten your password?

Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.

If you still need assistance, please email subs@inderscience.com