[Stoves] Cow dung and chimneys

[Sarbagya Tuladhar]

Hi Bob,

About a year ago, i had volunteered with the EWB australia working on developing a clean dung burning stove for people in Southern Nepal. The people burn dung for their cooking purposes using their traditional mud stove. The problem with that was the amount of black smoke (particulates) that was produced along with the harmful gases (NOx, SOx). We observed that via our several field visits conducted and consultation with the users. The users complained of teary eyes and discomfort while in the kitchen cooking food using dung. The design we incorporated for our dung burning stove was realizing the different characteristics of dung compared to firewood eg. Ash content, burning ratio, A/F ratio etc. We have however yet to conduct emission testing for CO, CO2, PM and other hydrocarbons for our stove. 
Still on the road to development.

Cheers 

Sarbagya 


Sent from my iPhone

On 11/02/2013, at 11:01 AM, rbtvl at aol.com wrote:

> Dear Sarbagya Tuladhar
> 
> I have little experience with cow dung as a fuel. Please share sites where I can learn about its dangers and other information. 
> 
> The Maasai we started working with all cooked with hardwood fuel indoors in unventilated houses.  So it was essential that we started with a reasonably efficient wood burning stove with a chimney.   
> 
> Only now we have found that in at least one of our new villages about one third of the people cooked with three stones indoors with dung.   Those who bought and had installed our chimney-based stove tell us the stove works with dung fuel, gets smoke out and uses less dung, just as our wood users report.
> 
> Our particulate and CO measurements for wood fuel indicate 90% reductions with our stove. Perhaps we are getting this sort of reduction of combustion products from dung in the house as well.  
> 
> You can see our current distribution model on the "stove" page on
> www.maasaistovessolar.org. 
> We are developing new models that work just as well but are much cheaper to produce and some include a "two burner" capacity.  
> 
> If, then, getting combustion products out of the house is a key cow dung fuel issue, then maybe our chimney-based approach is useful. 
> 
> Bob Lange. 
> Sent from my BlackBerry® smartphone provided by Airtel Tanzania.
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