B&W Circulating Fluidized-bed Boiler (CFB)
Circulating Fluidized-Bed Boilers

Circulating Fluidized-Bed (IR-CFB) Boilers

Drawing upon our extensive technical expertise and operating experience, B&W developed the Internal Recirculation Circulating Fluidized-Bed (IR-CFB) boiler which is the technology of choice for power plant owners seeking economy, reliability and flexibility. In addition, load-following capabilities are attainable with B&W’s in-bed heat exchanger technology.

B&W’s IR-CFB technology offers:

  • Higher reliability and availability
  • Lower maintenance costs
  • High combustion efficiency
  • A compact, economical design
  • Reduced erosion
  • Fuel flexibility
  • Low emissions

Design features improve performance, reduce costs, and minimize maintenance requirements.


IR-CFB Boiler
Capacity: To 2,200,000 lb/h (277 kg/s) or greater as required
Steam pressure: To 2600 psig (17.9 MPa)
Steam temperature: As required, usually to 1050F (566C)

B&W’s IR-CFB low maintenance design features:

  • Two-stage particle collection requires less maintenance than hot cyclones:
    • Eliminates thick refractory linings
    • Subject to lower erosion and can be thermally cycled faster than thick refractory
    • U-beams capture and recycle solids at lower gas velocities
    • Multi-cyclone dust collector (MDC) with metallic cyclones operate at lower temperature
    • Air slides eliminate loop seals and loop seal blowers
    • No sootblowers are needed with lower gas velocity convection pass; fine solids clean the tubes
    • MDC storage hoppers offer independent heat transfer control and more operating flexibility
  • Thin cooled refractory with higher stud density in furnace is a robust wall protector
  • IR-CFB uses 1/10 the mass of refractory of a hot cyclone CFB
  • Reduced diameter zone (RDZ) almost completely eliminates solids erosion of membrane wall at the transition section (solids flow obstructions from refractory and change in wall angle)
  • Bubble caps minimize back sifting of bed solids and bubble cap erosion
  • U-beams are contained in a water/steam-cooled enclosure eliminating hot expansion joints
  • Open bottom design can handle tramp materials in feed

                   B&W IR-CFB Boiler               


B&W IR-CFB Boiler with In-Bed Heat Exchanger

B&W IR-CFB Boiler with In-Bed Heat Exchanger

 *For applications with load-following requirements

New Build

Babcock & Wilcox (B&W) projects, new build
We consistently demonstrate the ability to successfully execute innovative solutions for our customers, from new equipment to large, complex full-scope engineering and construction projects.

Upgrades / Retrofits

Upgrades and Retrofits by B&W
Modifying, improving and maintaining existing equipment are vital considerations for the long-term viability and profitability of all operations.

Parts / Services

Babcock & Wilcox Parts and Service Support
An extensive network of worldwide regional service centers, field service engineers and technical support personnel are available to provide the customized service and aftermarket solutions for your requirements.

Project / Case Feature Items

B&W AG Processing CFB Boiler Project

AG Processing – Nebraska, USA

IR-CFB boiler supplies steam for soy bean processing while reducing emissions

Babcock & Wilcox - Great River Energy Spiritwood Project
Great River Energy Spiritwood – North Dakota, USA

Internal-recirculation CFB boiler, auxiliary and environmental equipment help combined heat and power plant supply process steam to adjacent malt plant

B&W Alunorte CFB Steam Generator Project

Alumina do Norte (Alunorte) – Para, Brazil

IR-CFB helps generate steam for refinery that produces and distributes alumina