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We have four GE Frame9 gas turbines (MarkIV) that always run on base load. I have noticed that while GT is running on furnace oil, sometimes (at least once in 2 hours) heavy dark black smoke comes out of boiler stack (GT running in combined cycle mode) which lasts from 5 to 10 minutes & then becomes normal. And sometimes this smoke comes out of stack in such a way as it was being restricted by something & then suddenly released (I mean like a quick burst). During these periods of heavy dark smoke, GT spread & exhaust temperature always remain normal. Moreover, this phenomenon is observed on all 4 GTs.
Any such observation by someone else?
Any such observation by someone else?