[Stoves] Uganda Turns to Local Volcanic Rocks As Substitute for Charcoal

[Crispin Pemberton-Pigott]

Dear Teddy

You are giving me inspiration (the main purpose of consultation). Here is something to try – maybe it will work and surprise everyone.

Get some of the char dust and mix it with a very small amount of ‘binder’ by which I mean glue. It could be made from plantain skins or sugar mill waste molasses or absolutely anything that is slightly sticky.

Then soak the pumice rocks into the mix – add water if needed to make it absorb properly. The ‘glue’ is to hold it together long enough to get it dry.

When you are finished you will have pumice soaked in char powder. Put it into a fire and see how it burns. The idea is to use (and re-use) the pumice as a carrier of the powder with the absolute minimum of binder – it might work without any, but I doubt it.

Other binders include fine clay slurry and something called “dung water” and clay. Perhaps you know what dung water is. It will make certain clays set like weak cement. Again, you only need a small amount. Avoid clay if you can because it will probably attach to the pumice when burned. Probably as mashed, boiled couple of plantains in a lot of water will make a good enough binder to hold powder.

It might emerge that this fuel is a viable alternative to lump charcoal at a price that is just about 100% labour.

Good luck
Crispin

++++++++

They re volcanic rocks. Found mostly in south western Uganda (near Rwanda Boarder - an area called Kisoro).


In Service,



Nolbert Muhumuza



Co-Founder & CEO



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2018-06-13 16:23 GMT+03:00 Crispin Pemberton-Pigott <crispinpigott at outlook.com<mailto:crispinpigott at outlook.com>>:
It sounds like they are confusing the word 'heat' with 'burn.

It is a solar thermal storage ‎cooker from the sound of it. Has anyone seen one?

Crispin



Hello everyone,



Would anyone know more about exactly what type of rocks these area?

''Ms Twine said the rocks only work in the solar-powered Eco Stove, which comes with an internal air supply system that helps heat up the rocks.

The stove is also fitted with an on-off switch that enables the rocks to burn when turned on, and cool and return to their natural state when turned off. The stove comes with a radio, phone charger and has two lights.

Unlike charcoal which burns down to ash, these rocks can be used multiple times without losing their power or texture.

Domestic stoves retail at Ush200,000 ($53) together with the rocks while a "bag" of the rocks alone sells for Ush35,000 ($9) for domestic use and can last up to six months.

Ms Twine says since the stove does not emit smoke, those using it are protected from indoor pollution.

"They [rocks] do not produce smoke, burn for a long time and you do not need charcoal anymore," she adds
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Teddy Kinyanjui
Sustainability Director

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