Re: GAS-L: Green Gas + CO2

[jerry dycus <jerry5335@yahoo.com>]

     Hi Ken and All,
        My reference used water bath too. But even
without water CO2 will rain out of the methane when
the temp and pressure get to the right point.
      Thanks for the hydraulic and hydrogen sulfide
removal tip. We have a lot of it here in Fla. 
                jerry dycus

--- renertech <renertech@xtra.co.nz> wrote:
> 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
> 
> 
> 


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