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: [email protected] [mailto:[email protected]] 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: [email protected] 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: [email protected] 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 <[email protected]>: > 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 > > > > ---------------------------------------------------------------- This message was sent using Illinois State University RedbirdMail _______________________________________________ Stoves 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/stoves_lists.bioenergylists .org for more Biomass Cooking Stoves, News and Information see our web site: http://www.bioenergylists.org/ _______________________________________________ Stoves 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/stoves_lists.bioenergylists.org for more Biomass Cooking Stoves, News and Information see our web site: http://www.bioenergylists.org/
