Firing System Resizing

Nozzle Pluggage

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

Venturi inserts provide better air flow control
across the damper opening range

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
Nozzle Tips

Nozzle Tips

We can facilitate repairs and work closely with our clients to make sure they are getting maximum operating efficiency and minimized emissions with their equipment. Our proprietary computer model will determine the correct size nozzle for your firing system, providing benefits such as:

  • Increased air velocity and fuel/air mixing
  • Cooler running nozzle tips for longer service life
  • Reduced number of tips and styles simplifying tilt linkage and maintenance
  • Complements damper venturi inserts
  • Improved windbox pressure controls across load range
  • Improved air flow control and reduced emissions
  • Better control of flame stability at low loads

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