Well, this thread has reached 13 pages so far and a lot of ideas have been added to the pot
How many more pages is anybodies guess??? Shouldn't we assemble some collectible data that might lead us down a narrower path?
Perhaps there needs to be a gathering format of some of the many variables into one locations to see what pattern of common denominators may surface???
I believe *Bob* had a substantial start in his post of a couple post above.
Bob wrote:What I think are definite contributors from reading both the AHS and AA manuals is that the following may contribute to puff backs:
1. Coal Quality
2. Fire bed thickness
3. Introducing too much fresh coal too quickly
I totally agree with his 3 comments.
And I'd like to add to *Bob*'s comment number 3.
Yes, introducing much fresh coal quickly is a factor, but I think it is more the problem when doing such just after a longer idle period, see after loafing along for a longer period the response is slower, when cycles are closer together the response is more robust and volatiles are consumed (nearly) as fast as they are generated. Which I believe is NOT the case when response is slow...assuming in both cases the same given amount of coal was added to the pot. Every boiler load is unique as is the seasons...this will make it hard to find a exact cause when looking elsewhere.
And one thing you will NEVER be able to control is "How much coal is added at a given time"...solution will have to come from some where else...Sorry
Make sense? Am I way off here?