[Digestion] DIY - Biogas burner and light Design...

[Hoysall Chanakya]

Dear Mike Barnet
The critical needs seem to be very simple and these we were taught early
and they are I suppose this much

Whatever be your pressure or flow, the primary air to gas stoichiometric
ratio is 8-10.5:1 (air + biogas for pirmary air mixing), mixing tube
length about 10-15cm at 100-150mm water pressure.  At the top, the gas-air
mixtures need to be brought to the burning surface - the openings are
usually 4-6mm wide for stable high temperature colorless flame.  At the
right air to fuel mix and achieving highest combustion temperatures (1050
celcius) - the flame will be barely stable and will emerge about 5mm above
the burner surface and will usually emit a short hissing sound.  At a
higher air to fuel ratio the flame head becomes unstable.  Gas consumption
at this stage would be about 400L/h giving an equivalence of about 2kW of
thermal efficiency around 55% (heat transfer efficiency) for a flat vessel
or receiving body

For mantle lamps a small deviation is suggested when working under normal
gas pressure 100-150mm water pressure).  First, reduce the mantle's
combustion surface to one third of what is usually available for a
kerosene usage.  That is tie the mantle such that only a third of the area
hangs down the rest is on the ceramic support above.  You should now be
able to support a flow of about 125L/h and yet have the mantle glowing
uniformly round.  If you do not reduce the combustion area (tie the mantle
to allow only a third of it to glow) the glowing area will not be uniform
and will keep moving around.  A burner will consume a third of the gas
used in conventional biogas burners - 4cft/hr (the original rating) about
125L/hr.

I guess you can now succeed without much of a problem

best wishes
chanakya




> Thanks David!
>
> I am actually working on a biogas stove for our training facility here in
> Jamaica.
> The info you provided is spot on, I have acquired the burners and will try
> to adjust same to work.
>
> Your description will help me a lot to make some simpler burners.
>
> Has anyone ever used Biogas in one of the "mantle" type burners for light,
> and can anyone comment on the effectiveness, and longetivity of same?
>
> Thanks much for the assistance.
>
>
> Mike Barnett
>
>
> -------Original Message-------
>
> From: David Fulford
> Date: 11/7/2010 7:15:51 AM
> To: Mike Barnett;  For Discussion of Anaerobic Digestion
> Subject: Re: [Digestion] Biogas burner and light Design...
>
> Mike, Hello,
>
> I have added a page on biogas burner design to the Biogas Wikispace. It
> includes a paper that I wrote on how to design a burner, which I wrote for
> a
> a group involved in making biogas burners in Africa. Ainea Kimaro used
> these
> equations in a project run by KIST in Rwanda (see the Ashden Awards
> report)
> and made a burner design that works well.
>
> Regards,
>
> David Fulford
>
> On 02/11/2010 06:48, Mike Barnett wrote:
>
>
> Anyone have an electronic copy of some biogas burners and biogas light
> designs handy?
> Can do the hard and dirty, am more interested in refinements such as
> adapting for biogas/air mixtures and "proven" tricks/technologies.
> Would appreciate it.
>
> Mike Barnett
>
>
>
>
>
>
>
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>
> 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/
>
>
>
>
> --
>
> ********************************************************************
> Dr David Fulford CEnv MEI, 15, Brandon Ave, Woodley, Reading RG5 4PU
> d.j.fulford at btinternet.com, Tel: +44(0)118 326 9779 Mob: +44(0)7746 806401
> Kingdom Bioenergy Ltd, www.kingdombio.com, davidf at kindombio.com
>
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>
> 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/
>
>


-- 
Dr. Hoysall Chanakya
Centre for Sustainable Technologies
(Assoc. Faculty at Centre for Infrastructure, Sustainable Transport and
Urban Planning (CiSTUP) and Centre for Contemporary Studies)
Indian Institute of Science, Bangalore 560 012
ph 91-80-2293 3046; fax-91 80 2360 0683


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