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Supercritical
SUBMITTED BY :Pratik gupta

1
It is a thermal power plant of installed
capacity: 2980 MW
 Stage 1 = 3 X 660 MW
 Stage 2 = 2 X 500 MW



Coal Source
› Dipika Mines of South Eastern Coalfields

Limited



Water Source
› Hasdeo barrage


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.
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.

 “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
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
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

10
Types of boilers
 Drum type (Sipat Stage II 500MW)
 Once-through type (Sipat Stage I 660MW)

11
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
12
Once Through Boiler
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

13
Super critical power plants

are the efficient plants to
produce greater out put
although it has some
drawbacks ….
Supercritical boiler ntpc sipat

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Supercritical boiler ntpc sipat

  • 2. It is a thermal power plant of installed capacity: 2980 MW  Stage 1 = 3 X 660 MW  Stage 2 = 2 X 500 MW 
  • 3.  Coal Source › Dipika Mines of South Eastern Coalfields Limited  Water Source › Hasdeo barrage
  • 4.  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.
  • 5.
  • 6. 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. 
  • 7.  “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
  • 8. 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. 
  • 9. Super Critical – A Fourth State Possess Goodness of both liquid and Gas …. 9
  • 10. 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 10
  • 11. Types of boilers  Drum type (Sipat Stage II 500MW)  Once-through type (Sipat Stage I 660MW) 11
  • 12. 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 12
  • 13. Once Through Boiler 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 13
  • 14. Super critical power plants are the efficient plants to produce greater out put although it has some drawbacks ….