[Digestion] Accurate Biogas Yeild

[Paul Harris]

G'day Vianney et al,

 

I think it was mentioned in this list not that long ago that a "floating
drum" storage offers a good, simple way of measuring gas production. You
just record the change in height of the drum and volume of gas = area *
height (area of a circle = pi Dsquared/4 or pi Rsquared and there are 1000
litres in a cubic metre). If you want more accuracy use a small diameter
drum with greater height to get the necessary capacity. Pressure and volume
of any gas are related by p1v1=p2v2, where p is pressure, v is volume and 1
represents the initial conditions and 2 is the final conditions. Mass and
volume are related by density, where Density = Mass/Volume and the density
of biogas is about 1.18 kg/m3. The easiest way to develop the pressure
needed for burners etc is to add weight to the drum (bigger diameter - more
weight, since Pressure = kg*9.8/sq.metres) and if you measure "pressure" in
mm of water you need to know Pressure (Pa) = 9.8 *Height (mm).  I think that
should let you calculate anything you need and I hope you understand the
"useful" metric units I have used. I will put an example (and possibly a
spreadsheet calculator!) on the biogas wiki.

 

Happy Digesting,

HOOROO

 

Mr. Paul Harris, Room S116b, Waite Main Building Faculty of Sciences, The
University of Adelaide, Waite Campus, PMB 1, Glen Osmond SA 5064 Ph    : +61
8 8303 7880      Fax   : +61 8 8303 4386
<mailto:paul.harris at adelaide.edu.au> mailto:paul.harris at adelaide.edu.au
<http://www.adelaide.edu.au/directory/paul.harris>
http://www.adelaide.edu.au/directory/paul.harris

 

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From: digestion-bounces at lists.bioenergylists.org
[mailto:digestion-bounces at lists.bioenergylists.org] On Behalf Of Vianney
Tumwesige
Sent: Monday, 22 November 2010 5:41 PM
To: For Discussion of Anaerobic Digestion
Subject: [Digestion] Accurate Biogas Yeild

 

Hello AD friends,

Hope everyone is fine. Back to business, how would you measure the biogas
yield of a system? LPG is measure in Kg and the user can tell how much gas
he consumes. Biogas being stored in a volume (liters or cubic meters) makes
it hard to relate to pressure (of the biogas).  Have you been able to find a
system pressure system good for Africa?

Thanks

-- 
Vianney Tumwesige

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