Using inexpensive consumable components is certainly a strategy to consider
when designing a burner/stove. You are using a 10 cm/ 4" metal liner. That
is close to the sixe of a juice can.
Lanny
----- Original Message -----
From: "Ray Menke" <[email protected]>
To: "Discussion of biomass cooking stoves" <[email protected]>
Cc: "Bob Fairchild" <[email protected]>
Sent: Monday, February 11, 2013 10:35 AM
Subject: Re: [Stoves] Destroying combustion chambers after TLUD pyrolysis
ends Re: Need experts advise on combustion chamber
I use a 10 cm (4") wide replaceable band of old stovepipe material
inserted into the lower section of the stove. When it burns away, I
just replace it with another one. (I have no other use for old
stovepipe.) It also would help to reduce the amount of air coming
from the primary fan to lessen the forge effect. However, as Paul
stated, Ceramic or cast iron would be a better solution.
On Sun, Feb 10, 2013 at 4:05 AM, Paul Anderson <[email protected]> wrote:
Dear Stovers,
I received an direct inquiry for assistance. I think my reply might be
useful for others, so I have removed identifying information and am
sending
the reply to all and a Blind Copy to him.
Dear (Friend),
I have read your description (below) and viewed the photos (not attached
here, but similar to a large Ourja stove).
I believe (am quite sure) that you might be starting the stove in it TLUD
mode with fuel ignited at the top, with fan assistance. But then you
are
continuing to burn the char that was created, and you are probably adding
more fuel to get the 3 hour duration.
Once the pyrolysis is finished, and the fire / heat is at the bottom, it
is
no longer operating as a TLUD stove. Your stove is essentially burning
the
char, with the assistance of forced air. You have created a forge, with
air being blown on the hot char. That will destroy your stove (as you
have
described). That is NOT a TLUD problem.
Ceramic or cast iron are probably your only materials for a solution.
Note that the Ourja stove (by BP and now by First Energy) is quite
similar
to your design, but smaller for residences. The Ourja stove has a cast
iron cup in the bottom. And it is glowing red hot at the end of the
cooking because it is a charcoal burning stove (with forced air) that has
made its own charcoal via the TLUD process, and then produces more
charcoal
when additional biomass fuel is slowly place on top of the hot char bed
where it will pyrolyze.
Sincerely,
Dr TLUD
Paul S. Anderson, PhD aka "Dr TLUD"
Email: [email protected] Skype: paultlud Phone: +1-309-452-7072
Website: www.drtlud.com
On 2/10/2013 1:14 AM, Friend wrote:
Dear Dr Paul Anderson,
I am from (developing country). i am doing R&D on Biomass smokeless stove
from last 1 year . i have designed stove for commercial application.
i have placed few stoves in hotels for testing last month . i am facing
lots
of problem in combustion chamber. within a month the bottom layer of the
combustion chamber has completely melted.
It is Top lit up draft(TLUD) forced draft biomass cook stove with 2
fans,one
for primary and another for secondary air. the combustion chamber which
we
have used is SS 304 (3mm thickness). the pellet capacity is 9 KG , which
burns for 2 hours - 3 hours .
Please help me in designing better stove . i need your help . will be
& Regards
--
Ray Menke
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