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Energetic and exergetic analysis is performed on a Steam Turbine Power Plant used in a Phosphoric Acid Factory. The
power plant is mainly constituted by two steam turbine cycles STGI, STGII and a turbo-blower group Tb-Bl. Mass, energy
and exergy balances are established on the main compounds of the plant. A numerical code is established using EES software
to perform the calculations required for the analysis considering real variation ranges of the operating parameters such as
pressure, temperature and mass flow rate. The effects of theses parameters on the system performances are investigated. The
minimum irreversibility rates are obtained for the condensers (0.5 MW), the deaerators (0.4 MW) and the blower (1.5 MW)
followed by the pumps and steam turbines. The heat exchangers present an irreversibility rate of about 5 MW. The maximum
energy efficiency is obtained for the blower followed by the heat exchangers, the deaerator and STGII. The exergy efficiency
obtained for the heat exchanger, the steam turbine generator, the deaerator and the blower are 88 %, 74 %, 72 % and 66 %
respectively. The exergy effeciency of STGI is analyzed taking into account the condensate flow rate. For mass flow rates through
the condenser of 12, 18 and 20 t/h. The optimum HP steam flow rates feeding the turbine, leading to the maximum exergetic
effeciency are 49, 51 and 56 t/h respectively. For the back pressure steam turbine STGII a maximum exergetic efficiency of
about 75.5 % is obtained with HP m of 73 t/h.
Khir Tahar is Professor in Mechanical Engineering at National Engineering School of Gabes – Tunisia. He was Adviser of the Minister of Higher Education and Scientific Research from 2012 to 2014. He received his BSc in Mechanical Engineering from the University of Tunis (1983). He obtained his MSc Degree in Energetic from the University of Paris XII (1984). He was awarded his PhD from the same University in Energetic Systems and Energy Management (1987). He obtained his Habilitation Degree in Energy System from the University of Gabes (2011). His research works cover Industrial refrigeration, Thermo-economic optimization, Power Plants and Renewable Energies.