Dear Frank
Those are all good points. Considering that we are not really in a position to include biochar industry standards in a stove performance test, and because there are clearly other applications someone might put the char remaining to (use it as a fuel in any of several types of device) it is only going to include a reference to this new type of stove and byproduct. We cannot load a standard with restrictions that stifle innovation or to not handle known issues well. If a stove produces fuel, it can be argued that some consideration of that fuel's energy value be given. If someone else wants to use that fuel for another purpose, that is their choice. This will probably the first standard drafted with a reference to biochar and containing any 'advantage' for producing it. Regards Crispin From: Stoves [mailto:[email protected]] On Behalf Of Frank Shields Sent: Monday, May 06, 2013 12:04 PM To: 'Discussion of biomass cooking stoves' Subject: Re: [Stoves] Definition of char-making appliance Dear Crispin, We need first to define 'char'. A stove that ends producing black torrefied wood is not a char maker, just a very poor stove. That definition I suggest as the IBI does as " > 60% of the DAF being carbon with H/C ratio < 0.7". OR my lower cost suggestion "loss in weight under no-oxygen conditions at >450c to be less than a specified percentage". Say less than 10% of the DAF fraction. Biochar is more than just the black stuff left over there should be a qualifier attached. I think the char used for cooking (street vender for example) could have more volatiles left over than biochar used for soils. It gets complicated. Street vender char makes a very poor biochar used for soils. Regards Frank Thanks
_______________________________________________ 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://stoves.bioenergylists.org/
