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Dear Deepak and listers,<br>
<br>
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. <br>
<br>
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 <a
href="http://biogas.wikispaces.com/Biogas+burners">biogas wiki</a>
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. <br>
<br>
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. <br>
<br>
Regards,<br>
<br>
David F<br>
<br>
On 31/03/2011 16:31, Deepak D. G. wrote:
<blockquote cite="mid:4D949E4F.1050308@gmail.com" type="cite">Dear
listeners, <br>
<br>
I would like to consult on a issue of flame lifting. <br>
<br>
I have installed 8 floating digesters and all are working well and
the gas production is also very good. <br>
<br>
The only issue I have right now is the flame lifting issue,
specially with the latest installation. The latest installation,
in a village in Bali, has a capacity of 1000 liter gas tank and
the distance between the structure and the stove is about 20
meters. I used a combination of a plastic tube and pvc of equal
size and that is 1/2". <br>
<br>
I can not get the flame burned immediately above the surface of
the burner but it is lifting. I have tried the same stove at home
in which the distance between the biogas and the stove is about
8 meters and the flame is stable and not lifting. <br>
<br>
Can anybody suggest solutions to this issue? thanks <br>
<br>
Rgds, <br>
Deepak <br>
<br>
<br>
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<br>
<br>
for more information about digestion, see <br>
Beginner's Guide to Biogas <br>
<a class="moz-txt-link-freetext"
href="http://www.adelaide.edu.au/biogas/">http://www.adelaide.edu.au/biogas/</a>
<br>
and the Biogas Wiki <a class="moz-txt-link-freetext"
href="http://biogas.wikispaces.com/">http://biogas.wikispaces.com/</a>
<br>
<br>
</blockquote>
<br>
<div class="moz-signature">-- <br>
<p align="center">********************************************************************<br>
Dr David Fulford CEnv MEI, 15, Brandon Ave, Woodley, Reading RG5
4PU <br>
<a href="mailto:d.j.fulford@btinternet.com">d.j.fulford@btinternet.com</a>,
Tel: +44(0)118 326 9779 Mob: +44(0)7746 806401 <br>
Kingdom Bioenergy Ltd, <a href="http://www.kingdombio.com">www.kingdombio.com</a>,
<a href="mailto:davidf@kindombio.com">davidf@kindombio.com</a> </p>
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