[Gasification] soot on heat exchanger tubes

[Zietsman, Rex]

Doug,

Doug wrote:

"2, At what temperature the gas enters the assembly, because rapid soot
flocculation occurs if gas is over 500C, reverting to CO2 and soot. Plus
to remember that even if you remove the soot, and cool the gas, it will
still make soot if it is heated again to over 500C. (Not that you would
want to) (:-)"

Please can you elaborate more on the soot formation in cooling gas down.
While I knew that soot occurs, I got an undertone from your comment that
it may coat the cooling heat exchanger. Has this been your experience?
My experience unfortunately is in industrial scale where the duct
surface to volume ratio is relatively small compared to a 2" cooled
tube. If it does coat, what do you do to keep it from doing so or to get
it off?

Kind regards
Rex