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Classification of Rankine Cycles
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Parametric Study of Rankine Cycle
h P max
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Specific Volume vs Temperature
@15MPa @35MPa
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Parametric Study of Rankine Cycle
23.5MPa 22MPa 18MPa 10MPa 6MPa 3MPa h 1MPa Tmax
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Reheating : A Means to implement High Live Steam Pressure
Supercritical 593/6210C 593/5930C 565/5930C 565/5650C 538/5650C Improvement in Efficiency, % 538/5380C
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More Bottlenecks to Achieve Supercritical Steam Cycle
3sub 4sub T 2 1 s
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Ill Effects of High Pressure Cycles
x Pressure, MPa
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Old Last Stage LP Blade
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Modified Loss Region
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Hurdles to Achieve High Pressure and Win-Win Solutions
P M V Subbarao Professor Mechanical Engineering Department I I T Delhi Right Placement of Energy into Working Substance…..
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Progress in Steam 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
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Why should steam condense during Adiabatic Expansion?????
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Thermodynamic Characterization of Working Fluid
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Philosophical Recognition of Working Fluid
Organic Substances must be selected in accordance to the heat source temperature level (Tcr < Tin source)
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Reheating of Steam to Enhance Quality at the Turbine Exit
Single Turbine drum
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Analysis of Reheat Cycle
Consider reheat cycle as a combination of Rankine cycle and horn cycle. Cycle = Cycle ’-1 + Cycle 4’ ’. Therefore, 4’ 6
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Analysis of the Reheat Cycle
4’ 6
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Clues to Achieve Double Benefit
Consider the ratio of Define Increment in efficiency
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Selection of Reheat Pressure
pmax= 15 MPa Tmax= 550 0C Tsat= C
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Effect of Reheat Pressure on New Tm,in
pmax= 15 MPa Tmax= 550 0C Tsat= C
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Effect of Reheat Pressure
Dh,% 1.0 0.2 0.4 0.6 0.8 ~0.3 prh/pmax
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Optimal Selection of Reheat Point
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Reheating : A Means to implement High Live Steam Pressure
Supercritical 593/6210C 593/5930C 565/5930C 565/5650C 538/5650C Improvement in Efficiency, % 538/5380C
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