[Stoves] Compact biogas plant

[adkarve]

We have special burners for biogas that allow a flow rate of 400 litres of
gas per hour under the normal operating pressure of a biogas plant. These
are available off the shelf. So I never tried to find out how they are
constructed. The holes in the burner, through which the flames come out
have a diameter of about 3 to 4 mm. Also there is no nipple or constriction
anywhere in the pipe that leads the gas to the burner.
Yours
A.D.Karve
----- Original Message -----
From: Richard Stanley <rstanley at legacyfound.org>
To: Discussion of biomass cooking stoves <stoves at listserv.repp.org>
Sent: Sunday, May 06, 2007 1:59 PM
Subject: Re: [Stoves] Compact biogas plant


> Dear Ad,
> In yoru recent post to Kevin, I am left a bit puzzled .
> Your note that the oldertanks made of meetal were heavy and provided
> a restiction to production can easily be understood.  If in fact you
> need weight with distance from the appliance, then it seems to me
> that ballast is indeed more sensible and less costly and more
> aesthetic way to go.  Our Tanzania cow dung digesters were indeed
> several hundred Kgs in weight. Even as spread  over a 2.5 mtr dia,
> this must have presented considerable constriction in production,
> which  we never knew about until you enlightneed us yesterday !.
>
> Still the appliances we used required 2.5 to 3mm dia feed jets (at
> the base of each burner) in order to accept the gas. The added weight
> created about 3 inches of line pressure (as determined thru simple
> observation of the bubbling in the in line water trap). This
> increased delivery pressure was thought necessary becasue the science
> at the time held that was more viscous than LP gas. Our tanki was
> about 8 ft from the kitchen. If line resistance was a problem, one
> could simply increase line diameter no ?
> I therefore wonder what kind of appliance you are using that it can
> burn such gas with what has to be a very reduced operating pressure.
> Do you have larger jets or ??
>
> Richard
>