effect of reheating and feed water heating on steam generation p m v subbarao professor mechanical...
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![Page 1: Effect of Reheating and Feed Water Heating on Steam Generation P M V Subbarao Professor Mechanical Engineering Department Good to Turbine and Cycle…](https://reader030.vdocuments.site/reader030/viewer/2022032705/56649dbd5503460f94ab02dd/html5/thumbnails/1.jpg)
Effect of Reheating and Feed Water Heating on Steam Generation
P M V SubbaraoProfessor
Mechanical Engineering Department
Good to Turbine and Cycle…..What about Steam Generator ???
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Effect of Reheat Pressure
prh/pmax
0.2 0.4 0.6 0.8 1.0
~0.3
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Selection of Optimal Reheat Point
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Reheat Supercritical Rankine Cycle
1
2
2s
3
4
5
6
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Reheating : A Means to implement High Live Steam Pressure
Impr
ovem
ent i
n E
ffic
ienc
y, % 593/6210C
593/5930C565/5930C
565/5650C
538/5650C
538/5380C
Supercritical
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Single-Reheat Ultrasupercritical Product LineGE Power
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Super Critical Cycle ~ 1990
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Double Reheat Ultra Super Critical Cycle
8
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Reheater Pressure Optimization forDouble Reheat Units
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Impr
ovem
ent i
n E
ffic
ienc
y, %
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Scope for Double Reheat in Ultra CriticalCycles
5380C
6100C
6100C
5380C
P,bar 350150
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Super Critical Cycle of Year 2005
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Double Reheat Super Critical Plants
Net efficiency on natural gas is expected to reach 49%. Net efficiency on coal is expected to reach 47%.
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Super Critical Cycle of year 2010
> 50 %
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Double-Reheat Ultrasupercritical Product LineGE Power
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Ultra Supercritical Installations of The World
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C
C
CC
Reassessment Thru Carnot Model
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s
Non-Isentropic Expansion !!!
A Macro Carnot Cycle !!!!
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Ideal Regenerative Cycle
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Regenerative Turbine
Regenerative heat transfer. Change in kinetic and potential energies are negligible
3
4
T
inin mmCMSSSF ::
CVout
outin
inCV WgzVhmgzVhmQ
22
CVoutoutininREGEN WhmhmQ
ssuming a single fluid entering and leaving…
2374 hhmhhmhhmQW outinREGENCV
REGENQ
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Analysis of Regeneration Cycle
s
12
2374
17
34
hhmW
hhhhmW
hhmQ
hhmQ
pump
turbine
out
in
additionHeat of Rate
outputPower Net cycle theof Efficiency
34
17
34
1734 1hh
hh
hhm
hhhhm
in
net
Q
W
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smS