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SUPERCRITICAL BOILER
SHIVAJI CHOUDHURY
What is SUPER CRITICAL
 The term "supercritical" refers to
main steam operating conditions,
being above the critical pres...
What is Supercritical Pressure
Pressure range
 Sub critical
: Below 221 bar-a
 Super critical
: 221bar-a and
above
STATE...
Two Phase Vs Single Phase Boiling
Impact of critical point on the
Boiling Process
 Beyond critical point of water, the latent
heat of vaporization becomes ...
6
Supercritical & Subcritical cycle
Benefit of supercritical technology
I ) Higher cycle efficiency means
 Primarily
 less fuel consumption
 less per MW in...
Natural Circulation Vs. Once
Through System
Supercritical boiler
Similarities-subcritical &
supercritical
 Basic operation of cycle is same i.e. Rankine Cycle.
Constructional Features ar...
Difference between subcritical and
supercritical power plants
 Sub-Critical Power Plant
 A typical example of this
syste...
Comparison of Drum and Separator
Drum for NC Boiler
Steam-Water separator
for Benson Boiler
Supercritical boilerSubcritical boiler
Supercritical thermal power plant
Increase of Cycle Efficiency due to
Steam Parameters
300
241
175 538 / 538
538 / 566
566 / 566
580 / 600
600 / 620
6,77
5,...
Supercritical Tube Materials
Super criticalSub critical
Boiler Tube
Spiral Waterwall
Advantages of Spiral Water Wall
 High Reliability of Water Wall Tube
 Proven Operating Record
 Low Water System Pressur...
Drum boiler vs benson boiler-
feedwater control
Temperature Control
HBD 660 MW Supercritical
Technological Journey to Supercritical
Boiler in India.
Steam Parameters for 500 MW units & Super-critical thermal
Power p...
Turbine cycle heat rate (norms)
Sipat ,supercritical boiler 660 MW
Rankine Cycle –Sasan UMPP
Super Critical Condition -660 MW unit
Turbine Cycle Heat rate - 1900 kCal/kWh
THANKING YOU
Super critical boiler
Super critical boiler
Super critical boiler
Super critical boiler
Super critical boiler
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Super critical boiler

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Super critical boiler

  1. 1. SUPERCRITICAL BOILER SHIVAJI CHOUDHURY
  2. 2. What is SUPER CRITICAL  The term "supercritical" refers to main steam operating conditions, being above the critical pressure of water (221. bar).  Above the critical pressure there is no distinction between steam and water, i.e. above 221. bar, water is a fluid.
  3. 3. What is Supercritical Pressure Pressure range  Sub critical : Below 221 bar-a  Super critical : 221bar-a and above STATES OF WATER : Critical Pt.= 221BAR,374 deg C
  4. 4. Two Phase Vs Single Phase Boiling
  5. 5. Impact of critical point on the Boiling Process  Beyond critical point of water, the latent heat of vaporization becomes zero and there is no distinction between liquid and vapor phase of water. Absolute Pressure (Bar) Saturation Temperature (o C) Latent Heat (K J/Kg.) 50 150 200 221 264 342 366 374 1640 1004 592 0
  6. 6. 6 Supercritical & Subcritical cycle
  7. 7. Benefit of supercritical technology I ) Higher cycle efficiency means  Primarily  less fuel consumption  less per MW infrastructure investments  less emission  less auxiliary power consumption  less water consumption II ) Operational flexibility  Better temp. control and load change flexibility  Shorter start-up time  More suitable for widely variable pressure operation
  8. 8. Natural Circulation Vs. Once Through System
  9. 9. Supercritical boiler
  10. 10. Similarities-subcritical & supercritical  Basic operation of cycle is same i.e. Rankine Cycle. Constructional Features are also same except supercritical is drumless Boiler.  The equipments & philosophy of working are similar in both the cases like:  Air preheater  Economiser  PA, SA & ID fans  Electrostatic precipitator  Boiler feed pump  Feed water heaters  Turbine  Condenser  CEP
  11. 11. Difference between subcritical and supercritical power plants  Sub-Critical Power Plant  A typical example of this system is the drum-type steam generator.  Natural circulation is produced by heating of the risers. The water/steam mixture leaving the risers is separated into water & steam in the drum.  The steam flows into the superheater and the water is returned to the evaporator inlet through down comers.  If the system is operated only with natural/assisted circulation, the application range is limited to a max drum pressure of approx. 190 bar.  Super-Critical Power Plant  This type of boiler is Drumless steam generator.  Evaporation takes place in a single pass.  Flow through the evaporator is induced by the feed pump.  The evaporator & superheater areas thus automatically adjust to operational requirements.
  12. 12. Comparison of Drum and Separator Drum for NC Boiler Steam-Water separator for Benson Boiler
  13. 13. Supercritical boilerSubcritical boiler
  14. 14. Supercritical thermal power plant
  15. 15. Increase of Cycle Efficiency due to Steam Parameters 300 241 175 538 / 538 538 / 566 566 / 566 580 / 600 600 / 620 6,77 5,79 3,74 5,74 4,81 2,76 4,26 3,44 1,47 3,37 2,64 0,75 2,42 1,78 0 0 1 2 3 4 5 6 7 8 9 10 HP / RH outlet temperature [deg. C]Pressure [bar] Increase of efficiency [%]
  16. 16. Supercritical Tube Materials
  17. 17. Super criticalSub critical
  18. 18. Boiler Tube
  19. 19. Spiral Waterwall
  20. 20. Advantages of Spiral Water Wall  High Reliability of Water Wall Tube  Proven Operating Record  Low Water System Pressure Drop  High Stable Operation  Easy Boiler Commissioning  Maintenance Free  Performance Evaluation
  21. 21. Drum boiler vs benson boiler- feedwater control
  22. 22. Temperature Control
  23. 23. HBD 660 MW Supercritical
  24. 24. Technological Journey to Supercritical Boiler in India. Steam Parameters for 500 MW units & Super-critical thermal Power plants : 660 MW500 MW Steam Flow- 1625 T/hr SH Presr.- 179 kg/cm2 SH Temp.- 540 0 C RH Temp - 540 o C Steam Flow- 2225 T/hr Steam Flow- 2120 T/hr SH Pres- 255 kg/cm2 SH Temp.- 540 0 C RH Temp - 568 o C SH Presr.- 255 kg/cm2 SH Temp.- 568 0 C RH Temp - 596 o C 200 MW SH Presr.- 150 kg/cm2 SH Temp.- 537 0 C RH Temp - 537 o C SH Pres.- 255 kg/cm2 SH Temp.- 5680 C RH Temp - 596 o C Steam Flow- 2550 T/hr Steam Flow- 550 T/hr 800 MW SH Presr.- 179 kg/cm2 SH Temp.- 540 0 C RH Temp - 568 o C Steam Flow- 1590 T/hr Note: 1.200 & 500 MW – Subcritical thermal power plant 2.660 & 800 MW - Supercritical thermal power plant
  25. 25. Turbine cycle heat rate (norms)
  26. 26. Sipat ,supercritical boiler 660 MW
  27. 27. Rankine Cycle –Sasan UMPP Super Critical Condition -660 MW unit Turbine Cycle Heat rate - 1900 kCal/kWh
  28. 28. THANKING YOU

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