THERMAL SCIENCE

International Scientific Journal

AVOIDABLE AND UNAVOIDABLE EXERGY DESTRUCTION AND EXERGOECONOMIC EVALUATION OF THE THERMAL PROCESSES IN A REAL INDUSTRIAL PLANT

ABSTRACT
Exergy analysis is a universal method for evaluating the rational use of energy. It can be applied to any kind of energy conversion system or chemical process. An exergy analysis identifies the location, the magnitude and the causes of thermodynamic inefficiencies and enhances understanding of the energy conversion processes in complex systems. Conventional exergy analyses pinpoint components and processes with high irreversibility. To overcome the limitations of the conventional analyses and to increase our knowledge about a plant, advanced exergy-based analyses are developed. These analyses provide additional information about component interactions and reveal the real potential for improvement of each component constituting a system, as well as of the overall system. In this paper, a real industrial plant is analyzed using both conventional and advanced exergy analyses, and exergoeconomic evaluation. Some of the exergy destruction in the plant components is unavoidable and constrained by technological, physical and economic limitations. Calculations related to the total avoidable exergy destruction caused by each component of the plant supplement the outcome of the conventional exergy analysis. Based on the all-reaching analysis, by improving the boiler operation (elimination of approximately 1 MW of avoidable exergy destruction in the steam boiler) the greatest improvement in the efficiency of the overall system can be achieved.
KEYWORDS
PAPER SUBMITTED: 2012-05-03
PAPER REVISED: 2012-09-14
PAPER ACCEPTED: 2012-09-20
DOI REFERENCE: https://doi.org/10.2298/TSCI120503181V
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2012, VOLUME 16, ISSUE Supplement 2, PAGES [S433 - S446]
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