Bubbling Fluidized-Bed Boilers

Fuel flexibility with low maintenance

Bubbling Fluidized-Bed (BFB) Boilers

B&W’s BFB boilers are designed to allow a wide range of fuels to be burned, separately or in combination. The ability to utilize various fuel sources and types provides owners with the flexibility to take advantage of opportunity fuels and control fuel costs.

B&W’s advantage

B&W’s BFB boiler is designed with reliability in mind. Several features combine to provide low maintenance costs, high availability and long-term reliability:

  • An open bottom design permits easy removal of oversized or foreign material.
  • A water-cooled, gas-tight lower furnace eliminates the potential for gas leaks caused from refractory damage.
  • Bottom-supported hoppers remove load from the boiler, reduce capital requirements, and reduce potential mechanical stresses between water-cooled and non-cooled components.

B&W Bottom-Supported BFB Boiler

B&W Bottom-Supported BFB Boiler

B&W Top-Supported BFB Boiler

Incorporated in our design are these features to reduce maintenance costs:

  • No wear parts
  • No moving parts
  • No water-cooled screws or beams
  • No cinder re-injection system
  • Long-lasting bubble caps



  • Bottom-supported: Up to 225,000 lb/h (28.4 kg/s)
  • Top-supported: From 225,000 to 1,000,000 lb/h (28.4 to 126 kg/s)

Steam pressure: To 2600 psig (17.9 MPa)

Steam temperature: To 1000F (538C)

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BFB Boiler Success Stories

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Oregon, USA
Open-Bottom Bubbling Fluidized-Bed Technology Case Study
Bubbling fluidized-bed (BFB) systems are attractive when wide fuel flexibility is required, and for firing high moisture and lower heating value fuels. B&W’s solution – an open-bottom bubbling fluidized-bed unit, was the first such B&W design in North America.
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United States
From Black Liquor to Sludge Case Study
Babcock & Wilcox (B&W) has extensive experience with boiler conversions and modifications, including extensive refurbishments of older recovery boilers to BFB conversion while reusing existing buildings and ancillary equipment.
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