In this discussion about biocoal - or torrefied wood it is very important to know why you are doing it.
I can only agree that you can heat wood to 200 oC using 10-12 % of hi as heat - some mec hanical energy and have a challenge with the "tars" that has evaporated. But - what have you obtained? apart from 20 % of the energy is lost and you have a tarry waste water mess to handle? The only reason that could justify torrefication - MAYBE - is if you want to feed the wood into an entrained flow reactor and needs particles of 100-200 my. To get a char/wood quality where that is possible You need to heat to 280-300 oC - and then you lose 30-40 % of the energy content plus some mechanical energy~ that sums up to that you have only 50 % of the original energy left to sell. With the focus of protection renewable carbon it will never be acceptable! Thomas Koch -----Oprindelig meddelelse----- Fra: [email protected] [mailto:[email protected]] På vegne af Thomas Reed Sendt: 19. juli 2012 13:39 Til: Discussion of biomass pyrolysis and gasification Cc: Discussion of biomass pyrolysis and gasification Emne: Re: [Gasification] BIOCOAL - THE WOOD FUEL OF THE FUTURE Tom Koch and all I believe BIOCOAL can be made from dry wood with less than 20% energy loss. It only requires the energy to raise the dry wood from 100-300C. Taking wood heat capacity as 1.26 kJ/kg-deg the energy to heat from 20-300C would be (280x1.26) 350 kJ/kg. (There could be other exotheric or endothermic energy terms, but his should be the right magnitude.) (1 kJ ~ 1 Btu.) so the energy cost of BIOCOAL is small compared to the 8000 Btu of heat released on burning. Thomas B Reed On Jul 17, 2012, at 1:11 AM, Thomas Koch <[email protected]> wrote: > But it will cost 50 % of the heating value of the wood > > -----Oprindelig meddelelse----- > Fra: [email protected] > [mailto:[email protected]] På vegne af > [email protected] > Sendt: 16. juli 2012 20:15 > Til: [email protected]; [email protected]; > [email protected]; [email protected]; [email protected] > Emne: Re: [Gasification] BIOCOAL - THE WOOD FUEL OF THE FUTURE > > There is a company formed to make torrified wood. I am terrified of the > prospects as it would be a lot easier to gasify wood at the site of coal use. > > Sincerely, > Leland T. "Tom" Taylor > Thermogenics Inc. > > > -----Original Message----- > From: Tombreed <[email protected]> > To: mark <[email protected]>; Michael Antal <[email protected]>; Art > Lilley <[email protected]>; Robb Walt <[email protected]> > Cc: Discussion of biomass pyrolysis and gasification > <[email protected]> > Sent: Mon, Jul 16, 2012 7:25 am > Subject: [Gasification] BIOCOAL - THE WOOD FUEL OF THE FUTURE > > Dear Mark, Greg and all > > > Thanks for your good wishes, and I am now mobile with a walker. Lots of time > to pursue thermoplastics, pyrolysis and BIOCOAL. > > > <><><> > > > BIOCOAL (290-310C) is a very specific product of WOOD TORREFACTION > (200-310C) which may become the ideal end product for wood fuel in the > future. > > > Heating wood to 300C drives off all water and some excess H2O and CO2, > giving an increase of energy content from ~ 8000 to 10,000 Btu/lb, a > friable product easily reduced to face powder particle size for > coal-like combustion, pelletization use, and conferring a waterproof > nature. The emitted gases are combustible, and more than adequate to > provide the process heat for roasting, crushing and briquetting. It is > superior to coal In lacking suffer and high ash. > > > I wish I was younger and richer. I believe I would jump into Biocoal > with both feet. Conventional COAL is such an ideal fuel in many ways, > and Biocoal fixes the problem areas of sulfur and ash. > > > <><><> > > > Before my fall I was planning to convert a 55 gal drum of wood scrap > into BIOCOAL. I hope someone will try this. > > > At idle the exhaust of a car or truck is about 700C at several ATM > pressure. Two taps, before and after the muffler should make it > possible to withdraw a 300C stream of gas through the barrel of wood > and heat the wood to BIOCOAL without allowing overheating. > > > By heating with a 300C gas, one prevents the exothermic continuing of > the wood to charcoal at 400 C. > > > Looking forward to a BIOCOAL future, > > > Tom Reed > > Thomas B Reed > > > > On Jul 15, 2012, at 2:59 PM, Greg Manning <[email protected]> > wrote: > > > > Greetings Tom, (and list) > > Tom, It's great to hear that the fall was not really bad, even though > still an inconvenence though. > > > I have one question/answer I would like to pose, and that is.... > > > Every pelletized product I've gasified, all have done the same thing, > they expand in heat/moisture of the hearth. > > > One solution I've come up with (even though it lowers the total > output of the gasifier) is using parasitic power to run a torification > process, instead of a partial combustion process. > > > All in all, when one looks to both methods of gas evolution, the later > is a cleaner method (torification). With the losses of available mass > for gas, when partial combustion is applied, the parasitic power > difference, in torification is much less, (because of more mass being > torified, instead of combusted). > > > Torification is a much easier method of controlling the hearth's > internal temperature, IMO, and handles pelleted products much better, > as it gets the moisture level to a level that does not expand the > pellets as much (air moisture ??). > > > > > Greg Manning > > > > > On Sun, Jul 15, 2012 at 11:30 AM, Tombreed > <[email protected]> wrote: > Dear Mark and all > > > Thanks so much for your warming words, twice as warming, here in the > Fairview Recovery unit of the Worcester Memorial Hospital system. I > fell down 13 stairs, bound to be unlucky, BUT no permanent damage! > I'm recuperating in my daugher's guest suite, dreaming about a Fall cruise! > <><><> > Here's a puzzle for all to chew on. "Gasification" of wood implies > the complete conversion of both the cellulose (80%) and lignin (20%) > components. The tars from the lignin are basically aromatic due to > the aromatic structure of lignin, and may be the principle component > of the smoke and tar. > > > The primary fuel is then the cellulose smoke, various volatiles that > burn cleanly, leaving no solids. > My expert Friend, Mike Antal, Coral Prof. At the University of Hawaii, > could give chapter and verse on the nature of the volatiles from > burning celluloses. > > > Paper and high cellulose paper products could be a much cleaner > biomass fuel and are easily pelletized. Wood pellets have become a > major fuel source in the past decade. Is it possible that paper > pellets could be even more important and cleaner and cheaper? > > > Best wishes to all of you from Tom Reed, back from a bad fall. > > > Tom Reed > > > > > > > > > > > > > Thomas B Reed > > > > > On Jul 12, 2012, at 3:42 AM, "Mark Ludlow" <a> wrote: > > > > Dear Dr. Reed, You are a mainstay and inspiration to us all. How > frustrating it must have been to feel yourself fall! There’s really no > reason why the Universe chose you. It certainly was not Karma. I know > you must feel miserable. But I hope that you know that many people love > and admire you and are probably wishing, as I wish, that they could > have taken that fall for you. Best wishes,Mark > > > > _______________________________________________ > Gasification 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/gasification_lists.bioenergylists.org > > for more Gasifiers, News and Information see our web site: > http://gasifiers.bioenergylists.org/ > > > > > > > _______________________________________________ > Gasification 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/gasification_lists.bioenergylists.org > > for more Gasifiers, News and Information see our web site: > http://gasifiers.bioenergylists.org/ > > > > > > _______________________________________________ > Gasification 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/gasification_lists.bioenergylists.org > > for more Gasifiers, News and Information see our web site: > http://gasifiers.bioenergylists.org/_______________________________________________ > Gasification 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/gasification_lists.bioenergylists.org > > for more Gasifiers, News and Information see our web site: > http://gasifiers.bioenergylists.org/ > > > > > _______________________________________________ > Gasification 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/gasification_lists.bioenergylists.org > > for more Gasifiers, News and Information see our web site: > http://gasifiers.bioenergylists.org/ > _______________________________________________ > Gasification 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/gasification_lists.bioenergylists.org > > for more Gasifiers, News and Information see our web site: > http://gasifiers.bioenergylists.org/ _______________________________________________ Gasification 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/gasification_lists.bioenergylists.org for more Gasifiers, News and Information see our web site: http://gasifiers.bioenergylists.org/ _______________________________________________ Gasification 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/gasification_lists.bioenergylists.org for more Gasifiers, News and Information see our web site: http://gasifiers.bioenergylists.org/
