[Stoves] New kind of Sawdust stove

Tue Oct 25 09:32:37 CDT 2016

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.

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.

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.

First, get a working model then experiment, particularly with the secondary air which I did not measure at all..

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<http://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<mailto: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”.

It is a vertical cylinder like a TLUD, with no primary air supply below the fuel.

[cid:image001.jpg at 01D22ED8.DEF5A5A0]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.

The cover at the bottom is to allow for the removal of ash.

Here is a view looking into the pipe from the top.
[cid:image002.jpg at 01D22ED8.DEF5A5A0]

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.
[cid:image008.jpg at 01D22DFC.8B9BAE90]

Here is a view of what is on the bottom:

[cid:image012.jpg at 01D22DFC.8B9BAE90]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.

The flames pass between the disk and the stove body.

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.

The stove works well and produces a roaring flame. As the sawdust burns, the pipe drops into the stove by gravity.

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.

Removing the top and looking inside while it is running stops the fire because of the missing blast of air.

[cid:image003.jpg at 01D22ED8.DEF5A5A0]
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.

In theory this method could be used to burn duff coal – a nearly free fuel that the very poor struggle to burn.

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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