Rajan,
Very interesting. Some questions and comments:
1. Is your stove something like a Rocket stove but with an air pipe
to confine and also preheat the incoming air?
2. Is the incoming air (via the pipe) so reduced that it will be
(mostly) primary air, meaning that no (or very little) of the O2 that
enters can get through the hot char and burning wood zone?
3. Is there any vertical distance between the top of the air pipe and
the bottom of the passage through which the stick-wood fuel enters?
(meaning, have you separated those two points of entry? They are
essentially not separated in a standard Rocket Stove.)
4. If 2 and 3 are correct, then estimate the amount of additional air
(mainly to be secondary???) that is able to enter via the passage
through which the stick-wood fuel is entering.
5. The addition of a concentrator (lid or disk or whatever) seems to
be important to you. What difference is there in performance if the
concentrator is not used? I think ( but Aprovecho people can confirm)
that a concentrator has been tried on standard Rocket stoves and found
to not deliver sufficient enhancement to justify adding a concentrator
to standard Rocket stove technology. Therefore, IF the "Rajan stove"
does have advantage from the concentrator, that indicates that there
is some entry of secondary air into the stream of combustible gases.
Is that before, or at, or after the hole in the concentrator?
6. Please describe the flame (is there one?) that comes above the
concentrator.
After reading the answers to the above, (and having some photos too,
please) then all of us can better comment on the nature of the
combustion and stove.
Congratulations!!!
Paul [email protected]
Quoting Johan Wessels <[email protected]>:
Dear Rajan
Have you got a drawing available for this stove?
Regards
Johan Wessels
South Africa
----- Original Message ----- From: <[email protected]>
To: "stoves" <[email protected]>
Sent: Wednesday, December 01, 2010 4:00 PM
Subject: [Stoves] A low cost modified traditional woodstove
Dear All,
I spent some time recently with Servals team in developing a low
cost improved traditional woodstove - and the result was good.
Basically a traditional looking stove ( a 4 litre metallic
container converted ) - clay lining ( can be changed over to
refractory or stainless steel ), flame concentrator at the top (
similar to TLUD stove ), air pipe ( metallic, around 12" long ) at
the bottom.
The flame concentrator has two functions ( as we all know ) :
1. Better mixing of combustion air with the woodgas - for a more
complete burn.
2. Brings the flame to the centre of the cooking pot bottom.
The air pipe ( horizontally placed ) brings a small quantity of air
below the burning wood mass at the centre. This air burns a little
quantity of charcoal, keeping this area intensely hot - this also
keeps a stable flame throughout. Since the pipe is metallic, this
air gets preheated ( inside the pipe ) before it reacts with
charcoal. We can imagine what pre-heated ( upto around 300 C ) air
can do to an already burning charcoal mass.
We also tried a grate at the stove bottom ( instead of the air pipe
). But the result was not good. Air pipe has the advantage of
pre-heating the air and also allowing only a controlled quantity of
air in. Some perforations near the hot tip of the pipe adds to the
performance.
It takes about 10 minutes for the air pipe to start functioning -
ie. when the stove bottom ( inside ) gets heated up sufficiently to
create a suction through the pipe.
The cross-sectional area of the air pipe can be around 10 % of the
cross-sectional area of the fuel-window ( through which the fuel is
fed in ). For an average domestic stove, 1 1/2" dia pipe should be
ideal.
The flame concentrator and the air pipe can be an add-on to any
traditional woodstove - including a three stone fire. Especially
the air pipe is a valuable add-on with negligible cost involved.
The small stove we tested had a fire-power of around 3 KW ( average
around 2 KW ). The flame looked almost as good as a TLUD stove ( ND
) flame. The fire-power can be easily upgraded for larger versions
of the stove. Flame control is like in any trditional stove (
withdrawing the burning wood ).
With Best Regards,
Rajan
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