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  1. 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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