[Stoves] answer for David Whitfield inquiry

[Paul S. Anderson]

Alexis, David and all,

The steam injector is for turbulance, and that helps shorten the flame. 
  A tall
flame that excessively licks the bottom of the pot (leaving much more black
soot) also results in less total efficiency, so there is a trade off of 
loss of
efficiency from the steam (short flame) and the longer flame.

Alexis, how long does the 250 ml of water last as a supply of steam?  I really
liked your photos of your device.  And thanks for acknowledging Mr. Hao in
China; he deserves much credit for the steam box application.

I question (and await your results) about a central steam ejector 
because it is
the crossover that makes the trubulance, and a parallel flow might not mix as
well.

Unfortunately, at Stove Camp there was not sufficient time (needing time under
the emissions hood) to do all the tests we wanted to do.  The one effort under
the hood with the Hao Steam Box in the Chinese combustor did not yield
meaningful results because the fuel container (where the gases are made) had
too many un-controlled primary-air entrances, especially for the trial 
with the
"official fuel" that is kiln-dried wood.  The whole "burn" raced along with
minimal control.  When I corrected the air entrance problem, the configuration
seemed to work well, but that was not under the hood.

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


Quoting alexis belonio <atbelonio at yahoo.com>:

> To David,
>
> Thanks for the email! Sorry for not immediately
> answering your quiries.  I just found it only today!
>
> The pot I used for the stove has a diameter of 26 cm
> and a height of 16 cm.  It is made from aluminum and
> can accommodate up to 5 liters of water in capacity.
> The steam is injected into the upper cylinder of the
> stove where the flame is comig out.  The steam box
> which contain 250 ml of water will generate steam at
> about 6 minutes.  The flame combustion is improved
> once the steam hit the burning gases.  The
> hydrocarbons during combustion is washed out by the
> steam it it goes with the ash as it falls down the
> burning layer of rice husk.  Tests had shown that good
> quality flame can be produced from steam injection but
> there is reduction in the thermal efficiency observed
> in the stove. The steam that crosses the burning gases
> quenches the flame from hitting the pot. Presently, we
> are developing a center steam injection that will
> concurrent flow with the burning gases rather than
> crossing it.  I will inform you then of this result
> once I finished it.  You may also asked Dr. Anderson
> about this and also Mr. Dean Still.  Both of them saw
> how steam injection works well in wood stove during
> our China Training on Biomass Gasification sponsord by
> the Asia Regional Cookstove Program (ARECOP).
>
> Alexis
>
>
>
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