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.


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

 *For applications with load-following requirements

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

Modifying, improving and maintaining existing equipment are vital considerations for the long-term viability and profitability of all operations.

Parts / Services

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

AG Processing – Nebraska, USA

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

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

Alumina do Norte (Alunorte) – Para, Brazil

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