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  Circulating Fluidized Bed Combustion Boiler

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• In all Fluidized Bed Boilers, there is a bed of hot sand, ash & fuel. The bed is kept in a turbulent fluidized state by the primary air which is introduced through nozzles located at the bottom of the combustor.

• Good & Rapid mixing between the Air, Fuel & Limestone in the fluidized bed creates excellent combustion conditions and high Sulphur removal.

• The large quantity of heat held by the bed functions as a thermal “flywheel”, keeping the temperature constant throughout the furnace and leveling out variations in fuel quality and moisture content.

• Low combustion temperature, low excess air and staged combustion provide means for minimizing the NOx generation in the flue gases.

• The operation characteristics of CFB ensure total fuel flexibility.



Design features of CFBC Boiler
  •   Completely gas tight membrane panel construction

  •   Steam Cooled Vortex tube

  •   Water cooled “Hot Loop” cyclone separator with inside refractory lining

  •   Entire circulation loop is made of water cooled membrane panel

  •   Simple fuel feeding system

  •   Elimination of maintenance prone expansion joints at the inlet of Cyclone, inlet & outlet of Loop Seal

  •   Water cooled Loop seal Partition Panel

  •   Radiant Panel type heat transfer surface is provided in the upper furnace to balance the heat pick-up between Evaporator and Super heater

  •   Specially designed non-mechanical Loop Seal

  •   Integrated Fluidized Bed Ash Cooler with Non-mechanical flow control for regulation of bed ash removal

  •   Well proven / time tested grid nozzles for different fuel applications

  •   Number of Boilers Commissioned in this type out of our Technology Team 39Nos

Environmental Comfort Design

SOx Control by

• Higher cyclone efficiency and recirculation of Limestone

• Optimized bed operating temperature

• Higher turbulence in the bed

• Higher residence time for the limestone

• Better reaction of Sorbent (Limestone) with air sulphur

     NOx Control by

• Lower Furnace operating temperature

• Staged Combustion - Primary & Secondary Air introduced in the combustor at different elevations



CIRCULATING FLUIDIZED BED COMBUSTION BOILER WITH REHEATER AND SUPER HEATER

CIRCULATING FLUIDIZED BED COMBUSTION BOILER

INTEGRAL CIRCULATING FLUIDIZED BED COMBUSTION BOILER

Fuel Flexibility


Coal

  •   Anthracite

  •   Bituminous

  •   Sub-bituminous

  •   Lignite

Waste coal

  •   Char

  •   Dolochar

  •   Coal Middlings

  •   Coal Washery Rejects

Agricultural Waste

  •   Wood waste

  •   Rice Husk

  •   Bagasse Pith


Petroleum Coke

  •   Delayed
  •   Fluid

Oil & Gas

  •   Refinery Bottoms.

  •   Natural Gas

  •   Blast Furnace Gas

  •   Bio-gas

  •   Used Tires

  •   Sludge

  •   Refuse Derived Fuel

  •   Oil

  •   Oil Shale