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ENERGY EFFICIENCY IN DRAFT SYSTEM

ENERGY EFFICIENCY IN DRAFT SYSTEM. Dileep Kumar DGM Corporate Operation Services NTPC Limited. Boiler Systems. Water treatment system. Feed water system. Steam System. Blow down system. Fuel supply system. Air Supply system. Flue gas system. Boiler Draught. …a force required to

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ENERGY EFFICIENCY IN DRAFT SYSTEM

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  1. ENERGY EFFICIENCY IN DRAFT SYSTEM Dileep Kumar DGM Corporate Operation Services NTPC Limited

  2. Boiler Systems • Water treatment system • Feed water system • Steam System • Blow down system • Fuel supply system • Air Supply system • Flue gas system

  3. Boiler Draught …a force required to • Maintain air flow through a fire bed to aid complete combustion • Draw the resulting hot gases through the system • Remove the products of combustion and discharge to atmosphere

  4. Functions of Draft System • To supply to the furnace the required quantity of air for complete combustion of fuel • To remove the gaseous products of combustion from the furnace and discharge these through chimney to the atmosphere

  5. Classification of Boiler Draught • Natural Draught • Artificial Draught • Induced Draught • Forced Draught • Balanced Draught

  6. Natural Draught • Caused by a Chimney • Easy to construct • Has a long life • Needs no auxiliary power • Draught produced varies with weather conditions and temp of FG • No flexibility to create more draught to take care of peak loads

  7. FANS IN A THERMAL POWER STATIONS • FORCED DRAFT FANS • INDUCED DRAFT FANS • PRIMARY AIR FANS • IGNITOR AIR FANS • SCANNER AIR FANS • SEAL AIR FANS

  8. FANS IN NTPC STATIONS

  9. AIR PATH

  10. PRIMARY AIR PATH

  11. FLUE GAS PATH

  12. Areas of energy saving • Plugging the air leakages in the duct system • Reducing the pressure drop across ducts. • Reducing the air in leakage from APH . • Changeover to VFD control over hydraulic control • Insulation

  13. Plugging the air leakages in the duct system • Expansion joints • Mettalic • NMEZ • Erosion of ducts • Cracks in the duct system • Air ingress from manhole doors.

  14. Reducing the pressure drop across ducts

  15. THANK YOU

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