[Stoves] Strata combustor general principles

Crispin Pemberton-Pigott crispinpigott at outlook.com
Mon Sep 14 14:21:35 MDT 2015

Dear Roberto


Thanks for the description.


“It is possible to cool down the smoke before mixing it with air, to have a premixing flame?”


To cool it you have to lose heat to something and that is usually a loss. If you can avoid cooling it and burn it right away, the heat is passed into the combustion and it will burn with lower PM, all else being equal, and the flame gases will have a higher temperature to give a better heat transfer. 


Also, if you can avoid condensing some (or all) of the tars, you so not have to heat them again to burn cleanly. There are some good reasons to have close-coupled combustion, right above the pyrolysis bed. Those are two.


With regard to adding a second row of tubes to provide more secondary air, care must be taken (using a combustion analyser) to see that adding too much is avoided. The emissions will minimise around some excess air value that depends on the architecture of the stove, but in the range of 35% to 100% excess air. 


Adding more than that will increase emissions and dilute them making them less visible. The most basic measurement is the oxygen level. If it ‘looks clean’ and O2 in the exhaust is under 10%, then things are probably going really well. 





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