Dear Kevin
>Rice Hulls are very interesting. While they have a high percentage of highly >siliceous ash, complete combustion could potentially make the ash available in >a hazardous manner. In Paul O's case, where he is interested in char making, >I would guess that most of the siliceous components would remain embedded >within the char particles, in a safe and non-hazardous manner. However, some >ash particles would be liberated in that some of the char would be burned in >the pyrolysis process. It would seem obvious that power a TLUD with a fan, or any other manner of burning rice hulls, would make the ash loft into the room. That is what a fan does to ash. The fact the rice hull is burned completely does not mean it is entering the room. If one adds a fan, then perhaps it does. The conclusion is that if there is a risk to people breathing the dust load created, then don’t put a fan on the system. If the risk is negligible, carry one. Regards Crispin
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