Analysis of Rankine Cycle: Techno-economically Feasible Thermodynamic Model P M V Subbarao Professor Mechanical Engineering Department An appropriate selection of operational parameters & Processes
Optimal Design of Vapour Power Plant
pmax=10MPa
pmax=10MPa
hturb,in hturb,out
If Carnot Studies The Rankine Cycle ! smin smax
Carnotization of Rankine Cycle Equivalent Carnot cycle of Rankine Cycle Heat Addition in Steam Generator, qin Mean Effective Temperature of heat addition for equivalent isothermal process or entropy averaged temperature
Equivalent Carnot Model of Rankine Model Heat rejection in Steam Condenser, qin Mean Effective Temperature of heat rejection for equivalent isothermal process.
Equivalent Carnot Model of Rankine Model Tm,in Tm,out smin smax
Analysis of Equivalent Carnot Model Net work out put = Heat Input = Efficiency,
Parametric Study of Rankine Cycle 23.5MPa 22MPa 18MPa 10MPa 6MPa D.S.S. 3MPa h 1MPa Tmax
Ideal Rankine Cycle : P-h Diagram pmax=17Mpa h=42.05% Tequi=284.40C Tmax=5500C 1 2 3 4 1 2 3 4 pmax=5Mpa h=37.8% Tequi=246.30C
Selection of Optimum Boiler Pressure Tmax = 450 oC h Pressure, MPa
Selection of Optimum Boiler Pressure Tmax = 450 oC x Pressure, MPa
Selection of Optimum Boiler Pressure Tmax = 450 oC xh Pressure, MPa
Progress in Rankine Cycle Year 1907 1919 1938 1950 1958 1959 1966 1973 1975 MW 5 20 30 60 120 200 500 660 1300 p,MPa 1.3 1.4 4.1 6.2 10.3 16.2 15.9 24.1 Th oC 260 316 454 482 538 566 565 Tr oC -- FHW 2 3 4 6 7 8 Pc,kPa 13.5 5.1 4.5 3.4 3.7 4.4 5.4 h,% ~17 27.6 30.5 35.6 37.5 39.8 39.5 40
qin wnet
qin wnet
htur.,in htur.,out
htur.,in htur.,out
Selection of Optimum Boiler Pressure Tmax = 450 oC xh Pressure, MPa
Parametric Study of Rankine Cycle 22MPa 23.5MPa 18MPa 10MPa 6MPa w, kJ/kg 3MPa 1MPa D.S.S. Tmax, 0C 450 550 650 150 250