THE IMPACT OF COOLING WATER CONDITIONS ON EXERGY DESTRUCTION AND PERFORMANCE OF A STEAM POWER PLANT

Idirs A. Elfeituri; Ali A. Amer

doi:10.66411/jer.v11i.181

Authors

Idirs A. Elfeituri Department of Mechanical Engineering Garyouns University, B.O. Box 32834 Benghazi-Libya Author
Ali A. Amer General Electrical Company of Libyan, Benghazi-Libya Author

DOI:

https://doi.org/10.66411/jer.v11i.181

Keywords:

Steam power plant, Cooling system, Exergy destruction, Condenser pressure

Abstract

Condenser operating conditions have been found to have a significant impact on condenser pressure and subsequently plant performance. This paper is devoted to study the impact of cooling water conditions, such as inlet temperature and flow rate on the exergy destruction and performance of a steam power plant. A 200 MW steam power plant is selected. The mathematical models considered take into account the off-design operating conditions of the power plant and also the thermodynamic processes that compose whole steam cycle. The exergy analysis provides a detailed breakdown of the exergy destruction for the overall plant and its components. A fully interactive computer program based on the implemented models is developed. The effects of typical variations of cooling water temperature and flow rate on plant exergy destruction and performance are considered. These include water temperature (range from 10 to 30^o C), and flow rate (range from 60 percent to 100 presents of the design value). The exergy destruction, power output, exergy efficiency and heat rate were calculated at different values of condenser inlet cooling water temperatures and flow rates and at full load boiler capacity. It is found in the present work that the capacity of the plant may differ by 17 MW due to the changes in the parameters under study

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