[Stoves] New kind of Sawdust stove

Wed Oct 26 02:19:02 CDT 2016

Dear Crispin,
thanks for the description. I have not understood it properly in the first
reading, but I hope to understand it eventually.
Yours
A.D.Karve

***
Dr. A.D. Karve

Chairman, Samuchit Enviro Tech Pvt Ltd (www.samuchit.com)

Trustee & Founder President, Appropriate Rural Technology Institute (ARTI)

On Tue, Oct 25, 2016 at 8:02 PM, Crispin Pemberton-Pigott <
crispinpigott at outlook.com> wrote:

> Dear Dr AD
>
>
>
> I do not have any more photos of it and I am now out of the country so it
> would be best if I made some drawings.
>
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>
> It is indeed used as a heating stove but that is more a choice than
> limitation. The pipe could just as easily fall in on an angle and a cooking
> surface be mounted on top. We should give this some thought.
>
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> I do like the fact that it burns, pretty well, fuel that is really poor at
> passing primary air through. One can imaging putting a 6mm diameter rod
> bent into a circle onto the bottom of the two ‘feet’ to prevent the thing
> falling into the char dust, and as the char burned away, it would sink in
> little by little.
>
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> First, get a working model then experiment, particularly with the
> secondary air which I did not measure at all..
>
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> It has a tube body, a removable cap that is air tight, a hole in it to
> pass the pipe with its ‘foot’ attached below (could screw on). It has a
> side exhaust chimney connector. The bottom has some sort of ash clearing
> tray that I didn’t open. Could be anything that works. There is no
> provision for air to pass through but it didn’t seem to be a tight fit.
>
>
>
> It has a chimney outside the building a few inches away. It has secondary
> air holes 125mm from the top – that dimension coming from the TLUD TJ3 we
> are making for school classrooms. I have, based on objections from the
> Tajiks, covered the secondary air hole with a vertical angle iron making an
> uprising secondary air supply heated by the stove body. I am using 1 x 17mm
> hole at 125mm from the top and it seems to work with the Kyrgyz coal widely
> available in the north. It does not work with Aini coal, not yet anyway.
>
>
>
> Is that enough info to make one to test? Altanbek is burning layers of
> fuel each of which is impenetrable to air. Maybe it should be tilted 25
> degrees to the side and a cooking plate placed above the flame. Depending
> on how you handle the ash, it could be refuelled through the bottom with a
> charge of sawdust loaded into a cylinder. Lots of possibilities.
>
>
>
> Regards
>
> Crispin
>
>
>
>
>
> Dear Crispin,
>
> the Altanbek stove appears to be a stove meant for space heating rather
> than for cooking. What I gather from your description is that one can also
> burn charcoal powder in this stove. That is good news for us because the
> char made from light biomass like leaf litter or from pine needles is
> powdery and we have to convert it into briquettes before we can use the
> char as fuel. We would certainly like to conduct some tests with it, but
> the pictures provided by you failed to give me a clear idea of the device.
> Can you provide more photographs showing details of its construction?
>
>
> ***
> Dr. A.D. Karve
>
> Chairman, Samuchit Enviro Tech Pvt Ltd (www.samuchit.com)
>
> Trustee & Founder President, Appropriate Rural Technology Institute (ARTI)
>
>
>
> On Mon, Oct 24, 2016 at 2:27 PM, Crispin Pemberton-Pigott <
> crispinpigott at outlook.com> wrote:
>
> Dear Friends
>
>
>
> I have just seen a type of sawdust burning stove not encountered before.
> It was designed by a guy called Altanbek, which means “Goldman”.
>
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> It is a vertical cylinder like a TLUD, with no primary air supply below
> the fuel.
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> You can see a handle on top of a pipe – the pipe is open at both ends. Air
> will enter the pipe and go down into the fire. The pipe has a sliding fit
> through a hole in the top cover which is reasonably air tight.
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> The cover at the bottom is to allow for the removal of ash.
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> Here is a view looking into the pipe from the top.
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> The pipe can be lifted by its handle in which case the plate welded on the
> end will knock against the underside of the cover, and the cover can in
> this way be removed.
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> Here is a view of what is on the bottom:
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> The disk is there to mount the other parts. The extensions on the side
> keep the pipe providing the air centered. The rectangles on the underside
> of the disk sit on the sawdust.
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> The flames pass between the disk and the stove body.
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> Sawdust is packed into the stove lit on top. Then the cover is placed on
> the body and the disk dropped onto the fire. Although not visible in the
> first photo there are 2 secondary air holes on opposite sides 125mm below
> the top.
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> The stove works well and produces a roaring flame. As the sawdust burns,
> the pipe drops into the stove by gravity.
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> Altanbek was burning waste cloth mixed with sawdust when I saw the stove
> operating. First some sawdust is placed in – about 75mm compacted, then a
> layer of cloth is added. Then another layer of sawdust and so on. The cloth
> is free from the sewing factory nearby.
>
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> Removing the top and looking inside while it is running stops the fire
> because of the missing blast of air.
>
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> Not much to see. Putting the pipe and cover back, the fire resumes
> burning. You can see one of the secondary air holes. It is not known if
> they are actually required. Possibly not.
>
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> In theory this method could be used to burn duff coal – a nearly free fuel
> that the very poor struggle to burn.
>
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> Summary: It is a TLUD with primary and secondary air supplied from above.
> The stove is used to heat the office of the welding shop.
>
>
>
> Regards
>
> Crispin
>
>
>
>
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