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  1. Knowitallnot

    Cause of white smoke from stack?

    Very helpful. Thank you.
  2. Knowitallnot

    Cause of white smoke from stack?

    Yes, O2 was increased and condition (opacity - white smoke) worsened. Lowered O2 and condition got better but CO started to form (O2 is down around 3% at 100% fire with decimal CO)) Decreased nh3 injection, condition worsened. Stack temp. is around 290 F. Thanks
  3. Knowitallnot

    Cause of white smoke from stack?

    125 kpph water tube boiler with scr (19% aqueous nh3) and co catalyst burning ulsd (15 ppm sulfur) getting white/brown (not blue) smoke at low loads (25% fire rate). Clears up at when firing rate is raised. Exceptionally long stack, 50% is horizontal, CO is zero, Nox is 9 ppm, nh3 is 4 ppm, O2...

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