[Stoves] Destroying combustion chambers after TLUD pyrolysis ends Re: Need experts advise on combustion chamber

[Lanny Henson]

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" <ray.menke at gmail.com>
To: "Discussion of biomass cooking stoves" <stoves at lists.bioenergylists.org>
Cc: "Bob Fairchild" <solarbobky at yahoo.com>
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 <psanders at ilstu.edu> 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:  psanders at ilstu.edu   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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