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Date: May 05, 2006 at 09:20:07
From: Keith Baylor, [verified user]
Subject: Re: Delta Queen Smoke - Sanding Flues?

The "Delta Queen" laid down a stupendous smoke screen at the start of the event, and again near the finish (which is where the posted picture was made). She smoked to a lesser degree throughout most of the race. On a non-condensing boat that exhausts up the stack(s), a sudden reduction in throttle setting without a companion reduction in firing rate will produce black smoke. The steam exhausted up the stack(s) generates an induced draft for the furnace, so if it is reduced, the draft diminshes and there is not enough combustion air to support clean burning. I understand that the "Queen's" plant is condensing, though, so I don't know how a change in throttle setting would impact her combustion air flow.

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