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super critical power plant

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super critical power plant is the power plant which operates at the

super critical power plant is the power plant which operates at the

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  • 1. Super criticalpower plant BY SRIDURGA 08761A0351
  • 2. contents Introduction Critical condition Super critical parameters Necessity Comparison of sub critical and super critical plants Types of boilers Drum type boiler Once through boiler Advantages of once through Conclusion
  • 3. What is super critical power plant???The power plant whichoperates above the criticalcondition is a ”SUPERCRITICAL POWER PLANT”
  • 4. Definition of criticalCondition CRITICAL CONDITION IS THERMODYNAMIC EXPRESSION DESCRIBING THE STATE OF A SUBSTANCE BEYOND WHICH THERE IS NO CLEAR DISTINCTION BETWEEN THE LIQUID AND GASEOUS PHASE.
  • 5. WHY ADVANCED SUPERCRITICAL?• Efficiency of the Rankine Cycleincreases with increasing Turbine inletTemperature and Pressure• Cycle efficiency of typical sub-criticalplant is 38% whereas today’ssupercritical technology increases thisto around 45-47%
  • 6. Sub-Critical vs Super CriticalDescription Sub Critical Super CriticalFull Load Pressure <190 atm >240 atmFlow in Water wall 2-Phase 1-PhaseCycle efficiency Base + 2 - 3 % ApproxFuel saving Base +8 - 10 % ApproxBoiler weight Base + 10 %Stages of reheat 1 2 Preferred
  • 7. Types of boilers  Drum type  Once-through type
  • 8. Design Types NATURAL CONTROLLED STEAM DRUM TO SUPERHEATERECON. CIRC. PUMP FURNACE WALLS ONCE THROUGH SEPARATOR • Natural circulation - well suited for < 175 kg/cm2 ECON. • Controlled circulation - optimum solution for reliable high-pressure subcritical operation • Once-through technologyCIRC.PUMP • Suitable for sub and supercritical cycles DISTRIB. HEADER
  • 9. Drum type boiler Natural Circulation Boiler Circulation through water walls by thermo-siphon effect Controlled Circulation Boiler At higher operating pressures (just below critical pressure levels), thermo-siphon effect supplemented by pumps to ensure safety of furnace wall tubes. Super Critical Boilers
  • 10. Drum type boiler Steam generation essentially 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 and fed back to water wall lower drum by means of boiler water circulating pumps (BWCPs). Super Critical Boilers
  • 11. Once Through Boiler-Concept Once through system Super Critical Boilers
  • 12. Once Through Boiler Once -through forced flow through all sections of boiler (economizer, water walls & super heater) Feed pump provides the driving head Suitable for sub critical & super critical pressures Super Critical Boilers
  • 13. Once-thru BoilerMajor differences from Drum type boiler : Evaporator system Low load circulation system Separator
  • 14. Once - thru Boiler Low load circulation system : The excess flow over the once-thru flow separated in separator . Recirculated back to the boiler directly by the dedicated circulating pump.
  • 15. LOW LOAD SYSTEM WITH CIRCIRCULATION PUMP
  • 16. Once -thru BoilerSeparator : Separates steam and water during the circulating mode operation Runs dry in once through flow mode. Smaller in size compared to drum in a drum type boiler
  • 17. Once -through BoilerAdvantages :- Better suited for sliding pressure operation Steam temperature can be maintained over wider load range under sliding pressure Conservation of fuel resources. Shorter start up time Improvement in Efficiency
  • 18. conclusionSuper critical power plants are theefficient plants to produce greaterout put although it has somedrawbacks ….