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| Digestion Archive for January 2002 |
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| 25 messages, last added Tue Nov 26 17:15:29 2002 |
[Date Index][Thread Index]
RE: DIG-L: Measurement of Biogas flow
I'd be interested to hear an answer to this as well. In my experience, you
may be able to find cheap, but there is no such thing as accurate. For all
of the reasons you sited below, the composition of d.g. is just too
irregular for accurate measurement.
If anyone out there has experience to refute this, I'd love to hear about
it!
Jeremy
-------------------------------------------------
Jeremy Holland, P.E.
Brown and Caldwell
9620 SW Barbur Blvd. Suite 200
Portland, OR 97219
Ph: 503-977-6616
Fx: 503-244-9095
-----Original Message-----
From: Ernst Murnleitner [mailto:awite2@awite.de]
Sent: Friday, January 18, 2002 4:56 AM
To: digestion@crest.org
Subject: DIG-L: Measurement of Biogas flow
Dear list-members,
I am often asked for measurement of the VOLUMETRIC gas flow of biogas (up to
500 m3/h).
Does anybody know a relatively cheap but reliable method of measurement of
the gas flow or of the gas volume (counter)?
The problem with biogas is the composition which is not constant. Therefore
many measurement methods are not applicable or very inaccurate, e.g. like
mass flow measurement.
Mass flow methods are not applicable, because the density of CO2 is 3times
the density of CH4. Therefore the thermal conductivity method cannot be
used.
I guess, that also methods with an propeller are dependent on the
composition as the dynamic pressure force depends also on the density.
Measurement of pressure according to Prandtl does not work because pressure
is not sufficient or pressure difference needed is too high.
Gas counters for natural gas could eventually be used, but what about
humidity and pressure loss? Another question is the corrosion.
Does anybody have experience with measurement of the volumetric gas flow?
Greetings
Ernst
********************************************
Awite Bioenergie
Ernst Murnleitner
http://www.awite.de
email: mur@awite.de
Tel. +49-8761-334979
Fax. +49-8761-334981
********************************************
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