Our extensive worldwide experience in designing, manufacturing, installing and servicing more than 700 RB boilers gives our customers the reliability and dependability they demand. B&W's RB boiler incorporates natural circulation which takes advantage of the density difference between water in the downcomers and the steam/water mixture in the furnace tubes. With natural circulation, no pumps are required, so auxiliary power requirements are reduced and availability is improved. B&W's RB boiler is typically designed with a parallel back-end that allows gas biasing reheat steam temperature control.

Benefits include:

• No attemperating spray requirements
• Reliable control of reheat temperature separate from the combustion process (as compared to tilting burners); this in turn:
  • eliminates interaction with combustion system optimization for NOx control
  • eliminates the effect on furnace slagging characteristics
  • avoids the need for maintenance of burner tilt mechanisms

Our surface arrangement design provides benefits for added reliability and availability, including:

• High temperature supports outside of the flue gas stream
• Minimal motion between the boiler roof penetrations
• Pendant section spacing appropriately matched for the gas temperature and coal slagging characteristics

Our vast design and operating experience gives us the unique capability to accommodate many worldwide coals and blends while meeting required steam conditions without sacrificing reliability or availability.