[Digestion] delivering biogas in cylinders

[adkarve]

Dear Paul,
I use starchy material in my biogas system. 1 kg starch produces 250 g
methane. I can ask farmers to deliver me sorghum grain at a particular
price, at my factory site. At the current wholesale price of Sorghum, I can
make methane and profit, because I can sell methane at the same price as
LPG. The current price of LPG is about US$ 1 per kg. All this is of course
still on the drawing board. The only technology that I today have, is making
250 g methane from a kg of sorghum grain, without the use of dung.
Yours
A.D.Karve
----- Original Message -----
From: Paul Harris <paul.harris at adelaide.edu.au>
To: adkarve <adkarve at pn2.vsnl.net.in>
Cc: <digestion at listserv.repp.org>
Sent: Thursday, May 17, 2007 3:37 PM
Subject: Re: [Digestion] delivering biogas in cylinders


> G'day,
>
> Have you looked at how much energy (biogas) is used to compress
> each  litre of biogas into the cylinder? Now add on the energy to
> collect waste to the central plant and then dispose of the spent sludge!
>
> I know variable volume storage is a nuisance and pipes around the place
> are messy, but lets look at the "system" rather than a small part of it.
>
> I see a "distributed" system where waste is basically treated "on site"
> and biogas locally utilised via pipes as a simpler and more efficient
> way of doing this (I know the total capital cost of digesters is higher,
> but the consequence of failure is also greatly reduced!
>
> Happy digesting,
> HOOROO
>
> adkarve wrote:
> >
> > I am conducting trials on compressing biogas in cylinders and to
distribute
> > it as cooking energy to householders. The idea is to install a large,
> > centrally located biogas plant and to provide householders daily with
about
> > 500 g of methane in a cylinder. I would not be attempting to liquify
methane
> > but just to compress it in order to reduce its volume. I was told by an
> > energy expert that by not removing the carbon dioxide from the biogas,
one
> > may be able to accommodate more methane in a cylinder, because methane
> > dissolves in liquid carbon dioxide.  Thus, one compresses biogas till
the
> > carbon dioxide is liquified, and the methane in the mixture
automatically
> > dissolves in liquid carbon dioxide. I am neither an engineer, nor a
> > physicist, but a biologist. Can any members of this group tell me
whether
> > the above procedure would be better than filling the cylinders with pure
> > methane?
> > Yours
> > A.D.Karve
> >
> > _______________________________________________
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> > Digestion at listserv.repp.org
> > http://listserv.repp.org/mailman/listinfo/digestion_listserv.repp.org
>
> --
> Mr. Paul Harris
> Room G8, Leske Building
> Faculty of Sciences,
> The  University of Adelaide, Roseworthy Campus, AUSTRALIA 5371
> Ph    : +61 8 8303 7880
> Fax   : +61 8 8303 7979
> mailto:paul.harris at adelaide.edu.au
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