[Gasification] BIOCOAL - THE WOOD FUEL OF THE ???????
Thomas Koch
tk at tke.dk
Thu Jul 19 07:28:44 CDT 2012
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: gasification-bounces at lists.bioenergylists.org [mailto:gasification-bounces at lists.bioenergylists.org] 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 <tk at tke.dk> wrote:
> But it will cost 50 % of the heating value of the wood
>
> -----Oprindelig meddelelse-----
> Fra: gasification-bounces at lists.bioenergylists.org
> [mailto:gasification-bounces at lists.bioenergylists.org] På vegne af
> linvent at aol.com
> Sendt: 16. juli 2012 20:15
> Til: gasification at lists.bioenergylists.org; mark at ludlow.com;
> mantal at hawaii.edu; artsolar at aol.com; rwalt at gocpc.com
> 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 <tombreed2010 at gmail.com>
> To: mark <mark at ludlow.com>; Michael Antal <mantal at hawaii.edu>; Art
> Lilley <artsolar at aol.com>; Robb Walt <rwalt at gocpc.com>
> Cc: Discussion of biomass pyrolysis and gasification
> <gasification at lists.bioenergylists.org>
> 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 <a31ford at gmail.com>
> 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
> <tombreed2010 at gmail.com> 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
>
>
>
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