Optimization and Energy Performance of 400MW Steam Power Plant Based on Mini REFPROP Software Packages

Malik F. Elmzughi*, Abdulhafed M. Mjani **, Saji S. Lagha ***, Mohammed A. Umbarek ****
*-**** Department of Mechanical Engineering, Faculty of Engineering, University of Tripoli, Tripoli, Libya.
Periodicity:August - October'2021
DOI : https://doi.org/10.26634/jme.11.4.18078

Abstract

In this research, the thermal analyses of cogeneration of thermal power plants are carried out. The considered power thermal system has a total power capacity of 400 MW, with turbines (high, intermediate, and low pressure), heaters (four low pressure, and two high-pressure heaters), six valves, and pumps (two boiler feed pump and condensate pump). The thermodynamics models are presented. The approach for defining and determination of exergetic efficiencies, irreversibilities, and improvement potential in thermal systems are presented. Thermophysical properties of working fluid and code simulations are obtained by employing Thermax, Mini Refprop, and Matlab software packages. The studied boiler temperature and condenser pressure ranges are 400-800 ºC, 4-10 kPa, respectively. For the operation, normal and economic conditions are considered. The maximum percentage value of the irreversibilities and potential improvement occurs in the boiler at 73% and 80% respectively. The irreversibilities, improvement potential, exergetic efficiency, and exergy are calculated. The rise in the boiler temperature makes the work pump drop to 5.8 MW, while the thermal plant efficiency slightly increases to 57.4%. The analysis shows that maximum improvement potential occurs in the steam generator, reheater, and condenser, with 156.0, 24.6, and 7.6 MW, respectively. The lowest energetic efficiency is 10.37% for the condenser, while the highest is for the deaerator with 98%. This kind of approach confirms which component has the priority for any service to be done to upgrade the considered thermal power plant cycles.

Keywords

Energy, Exergy, Efficiency, Exergy Destruction, Improvement Potential, Energetic Efficiency.

How to Cite this Article?

Elmzughi, M. F., Mjani, A. M., Lagha, S. S., and Umbarek, M. A. (2021). Optimization and Energy Performance of 400MW Steam Power Plant Based on Mini REFPROP Software Packages. i-manager's Journal on Mechanical Engineering, 11(4), 1-10. https://doi.org/10.26634/jme.11.4.18078

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