[Gasification] newbie question...

[David Meed]

Not sure what is involved in methane, other than filling a tank with
manure and water and waiting (with nose plugs<grin> )
- but on a small scale I wonder what kind of volumes of methane are produced.

If you take a typical small 5 kw generator (10hp engine) and figure it
has a cylinder volume around 400cc and it is turning 3600 rpm you
would be looking at .4lt * 1800=720 litres/minute or about 25.4 cfm of
gas. Even if you mix it 10:1 with air, you are using 2.5 cfm of
methane, 150 cubic feet per hour.  How many minutes will a small
digester run that engine?  (or how big does the digester have to be to
keep the engine running as long as you want it.)  Flaring a small
digester may be impressive, but what is the actual volume of gas it
provides?

With wood gasification you can "create" your fuel as fast as you need
it simply by sizing the gasifier to match your engine and pouring in
more wood chips or pellets.

Suggest spending a few weeks reading through the back postings here,
on yahoo woodgas group and look at drive on wood (although that may be
a pay site).  You'll soon figure out who knows what they are talking
about, and you can follow some of them back to their web sites for
more info.

David <been lurking a while> Meed


On Wed, Apr 1, 2015 at 6:20 PM, hugh <hugh at austrop.org.au> wrote:
> Just joined .. and have been interested in gas from wood pyrolysisfor quite
> a while - but also in methane from bio-digestion (small scale) .. and
> haven't been able to find a suitable group
>
> Does anybody have some suggestions?
>
> Cheers
>
> Hugh
>
> (Dr) Hugh Spencer
> Australian Tropical Research Foundation
> Cape Tribulation Tropical Research Station
> PMB 5 Cape Tribulation Qld.
>
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