Re: GAS-L: Green Gas + CO2

["renertech" <renertech@xtra.co.nz>]

Jerry and Jim,
 the removal of CO2  from biogas  is indeed easy  to do at the pressures and
temperatures that Jerry spoke of.     New Zealand Farmers have been doing it
for years.  Its like the packet cake recipes, you just add the water.
First of all, strip out the hydrogen sulphide by sucking the wet raw biogas
out of the gas holder through a drum full of flattened out rusty tin cans.
The rusty steel will react to make ferrous sulphide. To regenerate, just
open the drum and atmospheric oxygen will react to give metalic iron back
again for the next cycle, plus elemental sulphur and loads of heat so don't
do it in a plastic drum.    Stripping the H2S and moisture will protect your
normal run of the mill air compressor before it pumps the gas @ 150psi into
the bottom of a  vertical   6"-8"  pipe 3/4 full of water, which is being
constantly pumped into the bottom  and bled off through a liquid pressure
reduction valve near the top.  Depending what you are fermenting, it can
almost come out like soda water.    The methane comes out through a gas
pressure release valve at the top of the stripping column and goes on to an
old commercial LPG cylinder for intermediate storage before  final
compression.  There, our ingenious farmer boys use a pair of old double
ended hydraulic cylinders coupled end  on end.  One stroke of a three foot
cylinder will take you from  around 150psi to well over 2000psi  in one hit,
and all within the range of the cheapest of  hydraulic systems.  You can do
it with one double acting cylinder, but hydraulic oil at that pressure will
absorb a lot of methane and that does cause real problems.
Ken Calvert. renertech@xtra.co.nz





----- Original Message -----
From: "Jim Bland" <enecon@ozemail.com.au>
To: "jerry dycus" <jerry5335@yahoo.com>; "Dick Glick"
<dglickd@pipeline.com>; "Pletka, Ryan J." <PletkaRJ@bv.com>;
<bioenergy@crest.org>; <gasification@crest.org>; <green-power@crest.org>
Sent: Tuesday, September 18, 2001 4:44 PM
Subject: Re: GAS-L: Green Gas


> Jerry,
>
> Am I missing something here?  You seem to be saying that a mixture of
approx
> 50% methane and 50% CO2 can be separated by simple compression and
cooling.
> This is not so.
>
> At 10 bar (150 psia) the boiling point of CO2 is about -40°C (-40°F).  I
am
> not sure what effect the methane would have on this figure, but I would
have
> thought it would make it even more difficult to liquefy.  Maybe it's easy
to
> compress the mixture to 10 bar, but cooling it to -40° is not so easy.
> There is also the risk of forming solid CO2 at moderate
> temperatures/pressures.  A process was developed in the 1980s that
overcame
> this problem by addition of light oil - the Ryan Holmes process.  It was
> used in a few installations in the USA until it was superseded by
processes
> that were not so astronomically expensive, that relied on membranes,
amines
> or hot potassium carbonate.
>
> You are right that condensation temperature increases with increasing
> pressure, but to get condensation at ambient temperature you need about 55
> bar (800 psia), for pure CO2.
>
> To get a pipeline quality gas, you will also need to remove water, as I
> assume your gas will have some water vapour in it.  At -40°, you are going
> to have problems with ice!
>
> As others have already said, it is much better to use the gas for
> electricity generation, and to sell the electricity into the grid.
>
> Regards,
>
> Jim
>
> Enecon Pty. Ltd.
> 35 Whitehorse Rd.,  Deepdene  VIC  3103,  Australia
> PO Box 555,  Deepdene DC  VIC  3103, Australia
> Tel: +61-3-9817 6255
> Fax: +61-3-9817 6455
> www.enecon.com.au
> ----- Original Message -----
> From: jerry dycus <jerry5335@yahoo.com>
> To: Dick Glick <dglickd@pipeline.com>; Jim Bland <enecon@ozemail.com.au>;
> Pletka, Ryan J. <PletkaRJ@bv.com>; <bioenergy@crest.org>;
> <gasification@crest.org>; <green-power@crest.org>
> Sent: Tuesday, September 18, 2001 1:22 PM
> Subject: Re: GAS-L: Green Gas
>
>
> >       Hi Dick and All,
> >           Glad to see another biofueler from Florida.
> >          CO2 removal is easy and cheap. Since you are
> > going to compress it anyway when you do the CO2 will
> > condense out when cooled some and can be drained from
> > the bottom of the storage tank.
> >       I don't know the exact pressure but 150 PSI at
> > 150 deg F should do the trick. The higher pressure the
> > higher temp it condenses out at.
> >                      jerry dycus
> > --- Dick Glick <dglickd@pipeline.com> wrote:
> > > Hello All --
> > earlier this year where I
> > > addressed the Corporation for Future Resources'
> > > tropical and semi-tropical
> > > anaerobic fermentation, renewable energy solution.
> > > Under our conditions and
> > > with the size of our systems, biogas cleanup,
> > > methane separation, and
> > > pressurization -- if necessary for injection into
> > > pipelines -- are all
> > > economically feasible.
> > >
> > >
> > >
> > > There is a substantial renewable energy solution to
> > > a portion of the US,
> > > Florida in particular, but also semi-tropical
> > > regions of the US!  Again:
> >
> >
> > __________________________________________________
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>
>
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