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Cause of white smoke from stack?

Cause of white smoke from stack?

Cause of white smoke from stack?

(OP)
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 is 6%.  Any ideas?

RE: Cause of white smoke from stack?

Fuel may be off spec and your not burning everything. Have you tried increasing O2?

"Scientists dream about doing great things. Engineers do them." -James Michener

RE: Cause of white smoke from stack?

(OP)
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

RE: Cause of white smoke from stack?

(OP)
Very helpful.  Thank you.

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