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. > > _______________________________________________ Gasification mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org for more Gasifiers, News and Information see our web site: http://gasifiers.bioenergylists.org/
