G'day Mark et al,
I visited a digester (made from fibreglass) in Ireland that burned when
an electrical fault ignited gas and in Australia a covered lagoon
ignited after a contractor ripped the cover. I doubt if either count as
"flashback" but it is best to be careful.
Happy Digesting,
HOOROO
Mr Paul Harris BEng (Ag) (Melbourne)
Visitor at The University of Adelaide
On 3/08/2012 5:50 PM, David Fulford wrote:
Hello Mark,
The only occurrence about which I have heard is of
a very old Indian KVIC design, which used a
counter-balanced drum. The idea was that
sub-atmospheric pressure allowed more gas to come
from the slurry, but the extra gas was all carbon
dioxide. The idea also allowed air to enter the
drum. An over-enthusiastic local farmer opened the
gas valve in the top of the drum and lit the gas.
The floating drum took off, as the gas in it
exploded.
The only result was that a group of important
visitors got cattle dung slurry all over them.
Actually biogas is quite difficult to ignite.
Normal spark ignitors do not work well, you need
one with a gas bottle which produces a flame.
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