[Gasification] BIOCOAL - THE WOOD FUEL OF THE ???????
Pannirselvam P.V
pannirbr at gmail.com
Thu Jul 19 11:47:52 CDT 2012
Hi
On Thu, Jul 19, 2012 at 9:28 AM, Thomas Koch <tk at tke.dk> wrote:
> In this discussion about biocoal - or torrefied wood it is very important
> to know why you are doing it.
>
> very important objective questions , any product or process design
need to have very clear objective design goal
> 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?
>
There are good pyrolysis design where this energy can be minimized
good bio oil , low quality gas but can be good to use is possible
*GEK pyrolysis is one such good examples , where these energy lost in
the steam , combustion gases need to be made possible.Thus integrated
enegy generation has been not considered in remote places *
>
> 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
>
*Thomas , can you give me how many entrained flow reactor are working
, as milling need energy , then suspending in the bed need energy ,Is
it really viable in small , medium and big scale projects.*
> 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.
>
>
Very important point is the energy balance , too much burning for too
little , thus even no more benefits for environments
> With the focus of protection renewable carbon it will never be acceptable!
>
* This also need good CO2 balance , too much burning loss of
enegy you bring here , make me understand your pont very well made in
this context*
*There are many positive points as described well by others including
Prof Dr.Tom Reeds *
* There is an need to make possible this technology some
biomass energy integration too in remote area , this simple
hydrolysis can make possible big scale centralized power plant where
big mega city are there .*
T*homas , i guess there are several 20 plants made in Europe and may
be the same amount in USA as an alternate fuel to centralized power
plant as they always consumed charcoal , thus destroyed more than
50 percent of the forest, after this yet import charcoal , now very cheap
biocoal .Here equipment manufacture play key roles here .This was
very well explained in earlier post by TOM Miles , who are behind
and push this technology innovation .But if there is no stakeholders
to make it sustainable it may not survive*
Thomas , you have made correct questions in correct contexts , made
correct answer too , thus I can happily agree with your views
> 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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> >
> >
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--
************************************************
P.V.PANNIRSELVAM
ASSOCIATE . PROF.
Research Group ,GPEC, Coordinator
Computer aided Cost engineering
DEQ – Departamento de Engenharia Química
CT – Centro de Tecnologia / UFRN, Lagoa Nova – Natal/RN
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