[Stoves] Modified traditional Mongolian stove - pictures

Crispin Pemberton-Pigott crispinpigott at gmail.com
Wed Dec 22 10:50:14 CST 2010


Dear Friends

 

For a limited time I have placed some photographs with long file names
showing how to modify a traditional Mongolian coal stove. This modification
seems to reduce fuel use in the field by at least 20%, CO by 50% and PM by
80%. If you are in an area that burns coal and needs space heating (north
Asia for example) you may want to have a look and download all the photos (7
meg) for use later. Space is limited so they will be replaced with other
developments as time passes.

 

It costs $1 locally to make the adaption, which is saved within 2-3 days
depending on the weather.

 

We found locally a stainless steel tube 63 x 1.5mm wall. It is cheap enough
to be a viable large scale option. The modification takes a 28 cm long pipe
cut at 45 degrees on both ends.

 

In the photos this is substituted with a rolled sheet of galv sheet showing
that it can be done with scrap steel if nothing is available.

 

If there is interest a page can be developed for the BioEnergy site
explaining the same thing in more words.

 

The files are at:

 

www.newdawnengineering.com/library/stoves/shatlil

 

It shows how to modify the stove using bricks and clay (plus a piece of
pipe), how to light it using the End-Lighting Cross-Draft technique, and how
to refuel it. There are actually two ways to refuel it - the one shown is
refuelling through the fuel door. It can also be refuelled by opening the
top of the stove to achieve the same thing.

 

The power is variable, not just by changing the amount of fuel in it. The
combustion chamber can be narrowed with ordinary bricks. The stove can be
run in 5, 7, 11 and 13 kW configurations. For example tonight it is -28 C
and a small stove will be used wide open to give the needed heat. In a week
it might be -12 at night so the stove used drops in 2 long bricks and
continues to fill the (now narrower) fuel area. 

 

In all cases the coal is ignited at the end where the outlet to the chimney
is located and the fuel piled towards the door. This layout accomplishes a
sort of sideways TLUD that can be refuelled without creating smoke at the
end or having to reload at the very end of the burn. Hot coals and anything
else that can burn is raked to the chimney end and some wood tossed on top.
Flames develop. New coal is added between the fire and the door and the
process continues.

 

Two stoves have been made as a trial with a larger heat exchanger and a
slightly widened combustion chamber to make it easy for women to install
standard bricks (women do most of the stove bricking and maintenance).

 

The process of burning increases the burn time by about 100% and moderates
the kW so the gers (yurts) are heated more or less constantly instead of a
huge fire followed by rapid collapse.

 

This work is supported in many ways by the Asian Development Bank, World
Vision, XacBank Mongolia, Dalkia, Mon-Energy, and other organisations and
individuals. Support is in the form of laboratory testing, advertising,
demonstrations, field testing and gathering feedback.

 

Regards

Crispin

 

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