[Stoves] Wood Charcoal Gasifier Stove

[Paul S. Anderson]

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
>
> -- 
Paul S. Anderson, Ph.D., Geography professor - Emeritus
Telephone:  USA-309-452-7072 (residence and office)
Internet site:  www.ilstu.edu/~psanders
For my gasifier stoves info, go to:
http://bioenergylists.org/contributors#Paul_Anderson



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