[Gasification] Charcoal Reduction Mill

Mark E. Ludlow mark at ludlow.com
Fri Aug 26 21:10:40 PDT 2011

I am not familiar with this mill but I'll bet we can make it work! Truly,
keep everything in the milling and collection system at less than
atmospheric pressure. Post a sketch of the guts of this mill: (it's seems
like the discharge is under pressure; the blower should be the last
component in the stream to maintain keeping the micronized charcoal IN the
milling system. Trust me on this!

Good luck ( I just finished a project with 30-micron particles!

Best, Mark

-----Original Message-----
From: gasification-bounces at lists.bioenergylists.org
[mailto:gasification-bounces at lists.bioenergylists.org] On Behalf Of Jeff
Sent: Friday, August 26, 2011 8:22 PM
To: Discussion of biomass pyrolysis and gasification
Subject: Re: [Gasification] Charcoal Reduction Mill

Thanks Mark,

I was looking at this JD hammer mill:



On Thu, 2011-08-25 at 21:14 -0700, Mark E. Ludlow wrote:
> A small hammer mill would be fine, but you need to run it under 
> negative pressure to keep from making a mess. Start at the back end 
> with a small blower good for 12" suction. Then a  fake baghouse (three 
> old Shopvacs in parallel would be fine.) Then, a tall skinny, cyclone
> (high-efficiency) with a downleg terminated with a couple  butterfly 
> valves operating 90deg out of phase as an airlock. This dumps into 
> your collection bag/drum.
> Of course,  any kind of feed auger makes things more fun. Get a fine 
> screen for the mill and don't push things to prevent a conflagration 
> which would ruin anyone's day. The cyclone is about 99% efficient by 
> weight, so it takes the load off your "baghouse".
> An even simpler solution is a homebrew ball or rod mill.
> Mark

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