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 NO_x 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