Dear David,
Thanks for the advice. The issue is very difficult to get proper parts
and consistent sizing in bali. Every time I buy gas jet the size always
changes.
I actually get my burners made locally since it is not available locally.
I will try to reduce the gas flow by closing the gas tap bit and will
update you the result.
What do you mean by pressure control valve?? Please elaborate that
Regards,
Deepak
David Fulford wrote:
Dear Deepak and listers,
The issue of burner design and pressure control is one which needs
some careful planning. Biogas has a very low flame velocity, so if the
flame lifts from the burner, it means the flow rate of the biogas/air
mixture is too high, so the velocity from the flame port is faster
than the flame can burn.
If you are using burners from a reliable source, then the gas pressure
is too high. If you are using a floating drum, the weight of the drum
is too much. However, studies by SNV of burners made in different
projects suggests that the quality of burners from different places in
Asia is not consistent. (I say this as someone who helped design the
one now used by BSP Nepal, which was criticised by the SNV study). The
biogas wiki <http://biogas.wikispaces.com/Biogas+burners> has a
section on biogas burners, with a link to that SNV report. Our Nepal
design used too few flame ports. A larger flame port area would have
reduced the gas mixture velocity through the holes. You may need to
look for a better burner.
The simplest way to reduce gas pressure is to use a gas valve to
control the flow. Partly closing the valve will increase the pressure
losses, reducing the flow rate and the flow velocity. A longer lasting
solution is to use a pressure control valve.
Regards,
David F
_______________________________________________
Digestion mailing list
to Send a Message to the list, use the email address
[email protected]
to UNSUBSCRIBE or Change your List Settings use the web page
http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org
for more information about digestion, see
Beginner's Guide to Biogas
http://www.adelaide.edu.au/biogas/
and the Biogas Wiki http://biogas.wikispaces.com/
