Working fluid selection in steam cycle with heat recovery steam generator

Čehil, Mislav and Bogdan, Željko and Lončar, Dražen and Katulić, Stjepko (2011) Working fluid selection in steam cycle with heat recovery steam generator. = Working fluid selection in steam cycle with heat recovery steam generator. In: 6th Dubrovnik Conference on Sustainable Development of Energy, Water and Environment Systems, 25-29.11.2011., Dubrovnik, Hrvatska.

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In heat recovery steam generators (HRSGs) the temperature differences between an inlet flue gases temperature and a steam turbine inlet temperature are significantly lower in relation to those differences in conventional steam generators. So a pinch point phenomenon limits a working fluid mass flow and consequently the flue gases in HRSG can not be sufficiently cooled. To avoid a high HRSG flue gases outlet temperature a multi pressure HRSGs are used with a water as working fluid. To obtain a high thermodynamic efficiency of a steam cycle with HRSG the water as working fluid must have a high pressure. So to find out an influence of the working fluid selection on thermodynamic efficiency a thermodynamic model of a single pressure HRSG is made. Analysis is made for water and for various organic working fluid. The thermodynamic efficiency of the cycle as well as pinch point phenomenon are taken into consideration. Thermal efficiencies of a plant are presented in dependance of a steam turbine inlet pressure and temperature. The data presented in this paper can be used to determine the optimal working fluid with respect to the HRSG flue gases inlet temperature as well as to select the optimal steam turbine inlet pressure and temperature of the working fluid in order to maximize the power plant thermodynamic efficiency.

Item Type: Conference or Workshop Item (Lecture)
Keywords (Croatian): Heat recovery steam generator, waste heat utilization, pinch point, thermodynamic efficiency, organic Rankine cycle, working fluids
Subjects: TECHNICAL SCIENCE > Mechanical Engineering
Divisions: 500 Department of Energy, Power Engineering and Environment > 510 Power Engineering and Energy Management Chair
Indexed in Web of Science: No
Indexed in Current Contents: No
Date Deposited: 14 Apr 2016 09:55
Last Modified: 15 Mar 2017 09:48

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