[Gasification] Charcoal Reduction Mill

[Jeff Davis]

Phil,


Thanks for sharing your experiences! I'll have to do some searching for
roller mills.


Thanks again,


Jeff



On Sun, 2011-08-28 at 09:50 -0700, Jack Homerson wrote:
> I have used hammer mills, ball mills, and roller mills for size
> reduction of both straw char and charcoal. In all cases the MC of the
> char needs to be low enough not to make a paste (I have made this
> mistake before). I used a New Holland mixer mill (hammer type), some
> fine dust particles escape but it is not too bad, the most dust is
> created when using the unloading auger to bag the char, this can be
> mitigated by tying a filter cloth around the auger outlet.
> 
> I have used a ball mill with ceramic balls and rubber door seals, this
> is pretty much dust free but I found production to be terribly low and
> product sizing to be very inconsistent.
> 
> The very best I found is a roller mill. This is both fast and can be
> "housed in" to easily control dust, then follow Mark's suggestions to
> extract the very fine particles at the outlet. You can adjust sizing
> by adjusting roller spacing, or adding another set of rollers below
> the first. Cheap small roller mills can be found in the agri sector
> but must be modified for char
> purposes. 
> 
>