Stovers, So we have 'Wood and Biomass and we have biochar. Isn't everything in between torrefied biomass? And the definition of it starts when wood gasses start leaving the biomass and ends when the weight loss becomes stable (to a point)? If not we need more terms for fractions not filled in by torrefied biomass. I prefer having several degrees of torrefaction. That because the curve is steep for weight loss and structural changes between 250c and 450c. Stable below 250 and above 450c.
Not sure how to group the lower, middle and upper values of torrefied biomass. Lower could be up to when the biomass snaps meaning structure is broken, Upper is when the volume is 25% reduced to biochar. The TD sticks start at 0.69 cm wide and 15 cm long ( 10.35 cm sq)and end up at 650c to be 0.42 wide and 13 cm long (5.46 cm sq). Just suggestions Controlling the process of making the torrefied material we want to be sent for char making seems real tricky IMO. So much happens in such a small temperature-time change in this range. Frank Frank Shields 42 Hangar Way Watsonville, CA 95076 (831) 724-5244 tel (831) 724-3188 fax [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Tuesday, February 28, 2012 1:29 PM To: Discussion of biomass cooking stoves Subject: Re: [Stoves] Is there a role for combining torrefaction and char-making stoves? I' not sure about the attribution of the bit below but anyway: On Tue, 28 Feb 2012 00:32:13 +0000 (UTC), [email protected] wrote: >I don't think that 450 is the right upper limit for the term "torrefaction" - I think even 280 oC might be too high an upper limit. Saying this because I think we want to keep as much energy gas in the product as possible. Some of the first useful gases coming out are not exothermic - and so we don't mind losing them. We certainly shouldn't ever mind the big water weight loss. 450C is definitely the realms of charcoal, over half the dry matter has gone by this stage. Just because it has been given off by an endothermic process doesn't mean the offgas species are non combustible. I think anhydrous acetic acid will burn but not in combination with the other early species of pyrolysis, mostly water. AJH _______________________________________________ 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/
