1SUBMITTED BY :-Pratik gupta
SupercriticalBoiler
Introduction
It is a thermal power plant of installed capacity: 2980 MW
Stage 1 = 3 X 660 MW Stage 2 = 2 X 500 MW
Production Inputs
Coal Source› Dipika Mines of South Eastern Coalfields
Limited Water Source
› Hasdeo barrage
How electricity is produced?
Water is heated, turns into steam and spins a steam turbine which drives an electrical generator. After it passes through the turbine, the steam is condensed in a condenser and recycled to where it was heated.
Boiler
The term boiler is used for a closed vessel in which water or other fluid is heated
A Boiler or steam generator essentially is a container into which water can be fed and steam can be taken out at desired pressure, temperature and flow.
What is supercritical?
“Supercritical” is the thermodynamic state where there is no clear distinction between the Water and Steam phase in the Ranking Cycle
Water reaches to steam state at a critical pressure above 22.1 MPa at 374 °C
What is supercritical?
At 22.1 Mpa and above, there is no physical differentiation between water and steam.
This "critical point" is at the apex of the saturation line on T-s coordinates.
Above this pressure, the physical properties (density, compressibility, and Viscosity) change continuously from those of a liquid to those of a vapor.
Super Critical – A Fourth State
Possess Goodness of both liquid and Gas …. 9
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Benefits of Supercritical Units Higher unit cycle efficiency (40 - 42%)
Lower heat rate and electricity generation cost is lower
Lower water losses because no continuous blow down
Reduced auxiliary power consumption
Environmental Benefits
Reduce carbon dioxide (CO2) emissions and provides carbon credit within the Rankine cycle
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Types of boilers
Drum type (Sipat Stage II 500MW)
Once-through type (Sipat Stage I 660MW)
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Drum type boiler
Steam generation takes place in furnace water walls
Fixed evaporation end point - the drum
Steam -water separation takes place in the drum
Separated water mixed with
incoming feed water
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Once -through flow through all
sections of boiler (economiser,
water walls & superheater)
Feed pump provides the
driving head
Suitable for sub critical &
super critical pressures
Once Through Boiler
conclusion
Super critical power plants are the effi cient plants to produce greater out put although it has some drawbacks ….
Thank You