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Weezbo
Weezbo Member Posts: 6,232
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  • Firedragon_4
    Firedragon_4 Member Posts: 1,436
    For Flameheads only:

    http://www.thermox.com/calculator.cfm



    Enjoy and have fun, I use this a lot.

    www.firedragonent.com

  • jim sokolovic
    jim sokolovic Member Posts: 439
    What type of burner/fuel is...

    this site referring to?

    They claim: "Reducing the excess air will also reduce the NOx emissions by reducing free oxygen in the flue gas available for NOx formation" - this sounds logical, but any testing I've done on gas burners of various types shows the opposite (within the "normal" range of operating air/fuel ratios). If we follow their logic further, wouldn't reduced excess air also then provide lower CO2 and CO?
  • jim sokolovic
    jim sokolovic Member Posts: 439
    Further investigation reveals...

    NOx can be reduced by reducing the excess air - but this only applies to air/fuel ratios richer than 10% excess air. Most burners would be making CO off the scale in this range!
    NOx is typically reduced by burner design methods that decrease flame temperature or limit the amount of time the mixture is at the high temperature. NOx reduction seems more appropriate to be addressed at the design stage or with proper retrofit parts, vs. field adjustment of the air/fuel ratio?

    Can anyone post a typical combustion chart showing CO2, CO, and NOx vs. excess air? I can't make any sense of the chart on the website originally posted.
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