Jeff,
You do manage to dig up interesting collections. I note that the patents were all about 1960. At that time our friend Andy Baker the USFS Forest Products Lab was publishing reviews of charcoal and carbonization. I don't know what would have stimulated the market at that time besides barbecue charcoal. The gasifiers that I am referring to have a primary purpose of providing hot raw gas for process heat. They wind up with a carbon rich ash that makes good biochar. Tom From: Gasification [mailto:[email protected]] On Behalf Of Jeff Davis Sent: Sunday, December 01, 2013 6:30 PM To: Discussion of biomass pyrolysis and gasification Subject: Re: [Gasification] Small steam systems plus gasifiers for electricity On 12/01/2013 06:57 PM, Tom Miles wrote: Updraft gasifiers (>10 MWth) have been good sources of char for one biochar wholesaler/broker. Tom, Sounds like a money producer! Updraft gasifier anthing like the Thomas Retort? Can be found at this link: <http://www.fao.org/docrep/00950e/00950e07.htm> <http://www.fao.org/docrep/00950e/00950e07.htm> I found the patents to the other kiln: <https://www.google.com/patents/US3090731> <https://www.google.com/patents/US3090731> <https://www.google.com/patents/US3140987> <https://www.google.com/patents/US3140987> <https://www.google.com/patents/US3110652> <https://www.google.com/patents/US3110652> <https://www.google.com/patents/US2589895> <https://www.google.com/patents/US2589895> Lets get carbonizing.... Jeff
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