[Stoves] Is there a role for combining torrefaction and char-making stoves? HM

[Tom Miles]

Crispin,

ECN in the Netherlands has done work on the energy requirements for
pelleting. I size the pellet mill for wood and expect to get 50% more
production with torrified wood but I haven't pelletized TW in a full scale
mill yet. Last year I reviewed a paper from Denmark for an academic journal
that showed that pellet integrity breaks down if you torrefy wood at or
about 285 C which is supposed to be the magic temperature for torrefaction.
When you modify the cellulose and hemicellulose the plastic flow of the
lignin is not as complete so you do not get thorough bonding. I suspect that
producers will find a slightly lower temperature that will provide the
pellet quality but still be more than over-dried wood. 

See http://www.biochar.bioenergylists.org/search/node/torrefaction
http://www.biochar.bioenergylists.org/ecn030808

Tom  

-----Original Message-----
From: stoves-bounces at lists.bioenergylists.org
[mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of Paul S.
Anderson
Sent: Saturday, February 25, 2012 8:08 AM
To: Discussion of biomass cooking stoves; Crispin Pemberton-Pigott
Cc: Hugh McLaughlin; 'Discussion of biomass cooking stoves'
Subject: Re: [Stoves] Is there a role for combining torrefaction and
char-making stoves? HM


--
Paul S. Anderson, PhD
Known to some as:    Dr TLUD      Doc      Professor
Phone (USA): 309-452-7072   SKYPE: paultlud   Email: psanders at ilstu.edu
www.gtz.de/de/dokumente/giz2011-en-micro-gasification.pdf (excellent ref.)
My website specific for TLUD information: www.drtlud.com  =  www.DrTLUD.com



Crispin,

> Torrefaction greatly reduces the amount of power needed for pelletizing.
> Can you give us a reference on that, or if not, can you suggest a general
> rule about the reduction in energy requirement? That would be a valuable
> number to remember.

Sorry, that is far beyond my knowledge base.  But others know it or  
can find it.  It is indisputable, but at what quantifiable point does  
it have a net benefit?  I too await that answer.

Hugh McLaughlin might know that, so I have cc'ed him.  (He is not  
subscribed to the Stoves Listserv, so be sure to include his address  
if you want him to get a message.)

Paul
-- 
Paul S. Anderson, PhD
Known to some as:    Dr TLUD      Doc      Professor
Phone (USA): 309-452-7072   SKYPE: paultlud   Email: psanders at ilstu.edu
www.gtz.de/de/dokumente/giz2011-en-micro-gasification.pdf (excellent ref.)
My website specific for TLUD information: www.drtlud.com  =  www.DrTLUD.com


Quoting Crispin Pemberton-Pigott <crispinpigott at gmail.com>:

> Dear Paul
>
>
>
> Thanks for the concise (distillation?) of facts about torrefaction. Just
one
> question:
>
>
>
> Torrefaction greatly reduces the amount of power needed for pelletizing.
>
>
>
> Can you give us a reference on that, or if not, can you suggest a general
> rule about the reduction in energy requirement? That would be a valuable
> number to remember.
>
>
>
> The point about processing of fuels is very reasonable. In the South
Africa
> they make paraffin out of coal. Zero sulphur.
>
>
>
> Regards
> Crispin
>
>
>
>



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