[Stoves] Charcoal from waste - home cooking or other markets? (Re: Crispin, Anand Karve)

[Paul Anderson]

Ken, Rebecca and all,

I consider it to be UNdesirable to make briquettes or pellets from 
sawdust AND THEN ONLY PYROLYZE THEM to make charcoal.

A.  Wasting the energy to make the densified biomass fuel that will not 
be used as biomass fuel.

B.  Wasting the pyrolytic gases when turning densified biomass into char 
/ charcoal.

Note:  Pellets are great fuel for TLUDs AND YOU STILL GET THE CHARCOAL.  
If sawdust is being densified, the densified product can be useful.

Rebecca, I do not know of any "small, reasonable size" method to make 
raw sawdust directly into charcoal.  Of course it can be done in 
scientific laboratories, and probably in some expensive pyrolyzer-style 
large burners at some sawmill that wants heat, or in some fluidized bed 
gasifier that sprays in the sawdust (utilizing its small particle 
size).  I hope that somebody has a brilliant idea someday for a small 
inexpensive method, but not being done yet, as far as I know.

Paul

Doc  /  Dr TLUD  /  Prof. Paul S. Anderson, PhD
Email:  psanders at ilstu.edu
Skype:   paultlud    Phone: +1-309-452-7072
Website:  www.drtlud.com

On 10/13/2016 9:11 AM, Ken Boak wrote:
> Rebecca
>
> There's a lot of activity in the Ukraine - using relatively low cost 
> wood waste extruders sources from China (Alibaba "pini kay"  )
>
> http://piroliz.org/news/2013-12-23-16-50-12/eng
>
> The briquettes are made first  from raw wood waste - then pyrolysed in 
> a kiln.  This is an alternative method to pressure forming briquettes 
> from charcoal dust with starch binder - which might be more 
> appropriate on a village scale.
>
> I'm currently investigating both methods to see if I can find a 
> cheaper method of creating the pressures needed-  using solar 
> generated dc power -  but without using a $3500 machine from China.
>
> I can produce 50kN with a 1000W dc motor (forklift pump motor) and 
> then a hydraulic 50 tonne bottle jack  ($50 China) to step this up to 
> 500kN.  This is about 15.5MPa across a 64mm diameter briquette.
>
>
>
> Ken
>
>
>
>
> On 13 October 2016 at 14:57, Crispin Pemberton-Pigott 
> <crispinpigott at outlook.com <mailto:crispinpigott at outlook.com>> wrote:
>
>     Dear Rebecca
>
>     Not that I have heard of.
>
>     Crispin
>
>     Dear Chris, Crispin,
>
>     Do you know of a successful project where wood sawdust is
>     converted to charcoal and the charcoal processed into briquettes?
>
>     Regards,
>
>     Rebecca Vermeer
>
>
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