[Stoves] Grates and chimneys

Wed Feb 8 09:17:22 CST 2012

Dear all,

Stoves simply should not clog their chimneys.

The TLUD gasifier stoves such as what Otto mentioned can have chimneys  
if you want then, and those chimneys remain quite clean.   
Unfortunately we do not yet have TLUDs with chimneys installed  
anywhere long enough to measure how much or how little deposition  
occurs.  Factors of fuel types, ambient conditions, diameters,  
heights, etc will need to be included in any final major study.

But my experience with gasifiers shows minimal deposits (light  
dusting, perhaps) in chimneys or passageways of the hot gases.  I have  
never cleaned a chimney.

Paul
-- 
Paul S. Anderson, PhD
Known to some as:  Dr. TLUD    Doc    Professor
Phone (USA): 309-452-7072   SKYPE: paultlud   Email: psanders at ilstu.edu
www.gtz.de/de/dokumente/giz2011-en-micro-gasification.pdf   (Best ref.)

Quoting Otto Formo <formo-o at online.no>:

> Dear Roger and Bridget,
> Nice piece of work!
> Even a tray for the ash, most producers of stoves to day seems to  
> "forget" that biomass produce ash. (Gasifiers produce little ash)
> I just recall, that you where looking for a stove in combination of  
> heating and cooking to fit in a boat or a small cabin.
> Have you tried to ignite the biomass from the top?
> By doing so, you will burn out the gases in the biomass, first, and  
> will have a very clean and efficient burn, despite a chimney or not.
> Most people seems to forget, that dry fuel (less than 10% moisture)  
> and ignition on top of the fuel, is just as important as an  
> "efficient" stove.
> Have you tried or considered pellets?
>
> What is your retail price?
> I very much agree that such a stove will be very suitable for  
> outdoor activities, as well, like in tipies and small cabins in the  
> high mountains.
>
> Have a nice and warm day in Washington.
>
> Good luck.
>
> Otto
> A TLUD ND gasifier fan.............without a fan.......:)
>
>> From: Fireside Hearth [firesidehearthvashon at hotmail.com]
>> Sent: 2012-02-08 08:37:30 MET
>> To: stoves at lists.bioenergylists.org
>> Subject: Re: [Stoves] Grates and chimneys
>>
>>
>> Dear Xavier,
>>
>>        I should be offended, but alas, I will send you a video link  
>> instead........yes our stove has a chimney!
>>
>> http://www.youtube.com/watch?feature=player_detailpage&v=vkz6gKLayvc
>>
>>    Roger and Bridget Lehet.
>>
>> > From: xvr.brandao at gmail.com
>> > To: stoves at lists.bioenergylists.org
>> > Date: Tue, 7 Feb 2012 23:59:35 +0100
>> > Subject: [Stoves] Grates and chimneys
>> >
>> > " It is unfortunate that people produce stoves that have chimneys, but are
>> > not actually clean-burning."
>> > Do we actually have chimney stoves that do not clog up after few
>> > months/years? Even the cleanest stoves? Is it a good idea to build chimney
>> > stoves at all?
>> >
>> > "Your grate price is good! I think we should be  jealous! It would be so
>> > nice to be able to get good parts in cast iron."
>> > Hell yes, I can make 1 dollar iron grates, but I wish we could  
>> make 1 dollar
>> > cast iron grates in Benin. In fact, cast iron is very rare in Benin (West
>> > Africa? Africa?). When Africa will have the industrial production  
>> capacities
>> > of Asia, things will change!
>> >
>> >
>> >
>> > -----Original Message-----
>> >
>> > Message: 4
>> > Date: Tue, 7 Feb 2012 00:14:57 -0500
>> > From: "Crispin Pemberton-Pigott" <crispinpigott at gmail.com>
>> > To: "'Discussion of biomass cooking stoves'"
>> > 	<stoves at lists.bioenergylists.org>
>> > Subject: Re: [Stoves] advice for chimney wood stove for rural Burkina
>> > 	Faso
>> > Message-ID: <015301cce557$70642af0$512c80d0$@gmail.com>
>> > Content-Type: text/plain; charset="us-ascii"
>> >
>> > Dear AD
>> >
>> >
>> >
>> > Your story is not very unusual. It is unfortunate that people  
>> produce stoves
>> > that have chimneys, but are not actually clean-burning. My point is that
>> > just because one produces a chimney stove is no excuse not to use that
>> > additional expense to create the draft needed to completely burn the fuel.
>> > Astonishing really.
>> >
>> >
>> >
>> > I wonder if there is too much emphasis on 'clean indoor air'  
>> without enough
>> > emphasis on 'not needing to worry about clean indoor air' in the first
>> > place.
>> >
>> >
>> >
>> > That level of deposition is depressing. I heard about a stove  
>> being produced
>> > in the tea country high in Kenya which is used for space heating and
>> > cooking, According to the designer the 3 inch chimney would clog  
>> after three
>> > months. That is ridiculous! What kind of crummy combustion is that?
>> >
>> >
>> >
>> > A chimney is as good as a fan - especially 3.5 metres. Fan stoves are
>> > supposed to be really clean or you have not done a good job. Shoving bad
>> > combustion outside does not solve much. The situation in Ulaanbaatar is
>> > exactly like that. No one has a stove without a chimney. The air  
>> outside is
>> > so polluted that it is contaminating the air drawn into the homes. So the
>> > chimney solved nothing - the problem is the stove.
>> >
>> >
>> >
>> > Your grate price is good! I think we should be  jealous! It would  
>> be so nice
>> > to be able to get good parts in cast iron.
>> >
>> >
>> >
>> > Thanks
>> >
>> > Crispin
>> >
>> >
>> >
>> >
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>> >
>>
>

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