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Cause of white smoke from stack?
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Source：Internet Author：Unknow Pubdate：2010-06-24
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Knowitallnot (Mechanical)
5 Jun 10 20:18
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?
whammett (Industrial)
5 Jun 10 20:46
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
Knowitallnot (Mechanical)
6 Jun 10 5:16
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
字串9
25362 (Chemical)
11 Jun 10 9:13
I wonder whether the following link would be helpful:
www.alentecinc.com/papers/AMMONIA/-AMMONIA_FCG.pdf
Knowitallnot (Mechanical)
13 Jun 10 7:33
Very helpful. Thank you.
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