Firing System Resizing

Signs of Poorly Sized Firing Systems

Nozzles, registers, and dampers are commonly too large on older low NOx retrofits. Signs of a problem are:

• Low windbox air pressure
• Low nozzle exit velocities resulting in poor fuel air mixing
• Air dampers are closed at all loads to maintain windbox pressure
• Loss of air distribution control between windboxes and burners
• Reduced nozzle tip and register service life
• Localized slagging and nozzle/register pluggage
• High CO levels
• Uneven furnace gas temperature and emission profiles

Damper Venturi Inserts

R-V’s company culture calls for us to not only provide quality projects but to also prevent equipment damage down the road. We offer to look at client’s processes and suggest solutions for optimizing their unique firing system.

Likewise, we recognize the damages that can occur if a firing system is not properly fitted and, through research and engineering, we can offer a solution. Damper Venturi Inserts resize the tangential windbox dampers and provide the following benefits:

• Restore windbox and furnace DP control over greater unit load range
• Operate in control range
• Reduce NOx and CO on overfire air based combustion systems
• Improve nozzle tip cooling and life
• Increase hot air and PA flow to exhauster mills, particularly for RPS mills
• Better control of flame stability at low loads