[Stoves] Wood Charcoal Gasifier Stove

[Saibhaskar Nakka]

Dear Paul, Belonio and All,

Congratulations to Belonio for creating another great stove. It is
interesting to learn the technology as explained by Prof. Paul how with
single source of forced air system, we could achieve great results. This
opens up a new stream of possible clean stove technologies.

Dr. N. Sai Bhaskar Reddy

Message: 5
> Date: Tue, 07 Aug 2007 22:38:48 -0500
> From: "Paul S. Anderson" <psanders at ilstu.edu>
> Subject: Re: [Stoves] Wood Charcoal Gasifier Stove
> To: frank at compostlab.com, Discussion of biomass cooking stoves
>         <stoves at listserv.repp.org>
> Cc: Alexis Belonio - Philippines <atbelonio at yahoo.com>
> Message-ID: <20070807223848.51vmu2llc8k04sss at webmail2.ilstu.edu>
> Content-Type: text/plain;       charset=ISO-8859-1;     format="flowed"
>
> Dear Frank and all,
>
> I believe that Alexis Belonio does not read all of the Stoves messages,
> so I am
> sending this to him directly as well as giving a reply to your questions.
>
> Quoting frank <frank at compostlab.com>:
>
> > I was just wondering where the secondary air enter the combustion area?
> > Is the space between the outer and inner cylinders completely filled
> > with insulation?
>
> Completely filled.
>
> > and does the fan supply both primary and secondary air?
>
> No.  In the Belonio stoves (this one and the rice husk TLUD gasifier),
> the gases
> are so good that there is only forced primary air, and no forced
> secondary air.
>
> The created gases go upward through the many small (3 or 4 mm diamter)
> holes in
> the combustor top.  This forces the gases to be in small streams that can
> be
> reached by the surrounding ambient air, which is the secondary air.  (Much
> the
> same as the smaller jets of LPG or natural gas that come out in a modern
> stove
> using those fuels.)
>
> I have not seen combustion that accomplished in TLUDs that burn common
> woody
> biomass.  My experiments with this were very brief and not very
> enlightening
> (no conclusions pro nor con concerning woodgas).  But Alexis does it with
> rice
> husk and with the charcoal fuels.
>
> It is instructional to remember that the gasifiers are gas makers, and
> that the
> combustion (the gas burning) is separate.  Therefore, pushing the hot
> volitile
> gases through small holes to create more surface area for mixing with
> ambient
> secondary air can actually work.  But in any of the stoves that use
> traditional
> burning of biomass, the secondary air is already inside and therefore
> there is
> no advantage or no reason to try to get the flames to go through small
> holes.
>
> Alexis Belonio has again shown all of us some innovative stove work of the
> highest quality.  Congratulations to Alexis.
>
> Paul
>
>
>