[Stoves] Cleaning Dung

[SARBAGYA TULADHAR]

Hi Stovers,

I am undertaking my uni graduate project on the  Use of CFD for the study of heat transfer and convection in a Dung Burning Cookstove. With this project, a heat transfer and convection analysis would be carried out using Computational Fluid Dynamics (CFD) for the optimization of dung burning cooktove that is currently being developed in Nepal. The analysis would involve simulation to predict the performance of the cookstove and would set up a benchmark for improved stove manufacturing in Nepal. This analysis would also assist in providing the experimental and the simulation results towards getting the stove certified as an “Improved Cookstove”. 

However to simulate the dung burning I had to resort to using the fixed heat source instead as modeling combustion/pyrolysis of dung was beyond the scope of the project. So what could be the heat output from burning 1 kg. of dung. How mush heat would be released from this ? Is that the calorific value dung ? As I would be using a fixed temperature heat source, what could be that temperature ? 

Cheers

Sarbagya Tuladhar
   
On 13/02/2012, at 2:27 AM, Anand Karve wrote:

> Dear Richard,
>  The undigested solid matter in the dung is in fact the lignocellulosic matter, However, in the case of ruminents, it is not in a fibrous form but in the form of particles due to the practice of chewing the cud.  It is the dung of non-ruminents, like horses and elephants that has fibres.
> Yours
> A.D.Karve
> 
> On Sat, Feb 11, 2012 at 11:30 PM, Richard Stanley <rstanley at legacyfound.org> wrote:
> Ad,
> 
>  I don't personally think the solids would be of much value for a good briquette:  What I would look for personally, is  your lignocellulosic material, ( the more fibrous stuff)  to encapsulate other more carbon rich salt free, materials sawdust charcoal crumbs/ dust, selected agro residues with aromatic-or non aromatic- considerations depending upon what kind of fuel aroma and duration of heat you desire.
> 
> Richard Stanley
> 
> 
> On Feb 10, 2012, at 9:36 PM, Anand Karve wrote:
> 
> Cattle dung consists mainly of non-digestible lignocellulosic material, millions of micro-organisms, mucus produced by the animals and by the microbes, and some minerals. In fact it is the microbes and the mucus in the dung that yield biogas on anaerobic fermentation.  A pressurised sieve, technically called a filter press, is the best device for separating the non-soluble solids from the fluids. If the fluids contained the microbes and the mucus, they should be subjected to anaerobic digestion before allowing them to be used as manure.  Dung also has a very high ash content, because of which its calorific value is rather low. Dry dung has calorific value of about 3500 kcal/kg.  Has anybody measured the calorific value of the solids in the dung, after removal of the fluids from it by using a filter press?
> Yours
> A.D.Karve   
> 
> On Sat, Feb 11, 2012 at 8:27 AM, Sarbagya Tuladhar <sarbagya007 at gmail.com> wrote:
> Hi Boston 
> 
>  
> I volunteered with EWB Australia in Nepal working on a clean dung burning stove and thus worked with the dung as a fuel . Washing of the dung was done and briquettes which was a real success. Paper pulp used as a binder worked really well. Also the chloride contents of the dung which is responsible for watery eyes was removed on washing the dung which was proven by the copper wire test. We even fabricated a simple dung press for the same. The liquid portion of the dung was reutilised as manure in the fields. Thus the whole sceptism about "should" use dung as manure in the fields and not as a cooking fuel was somewhat solved. Did not test the NPK contents of the liquid portion though...
> 
> Sarbagya 
> 
> Sent from my iPhone
> 
> On 11/02/2012, at 2:06 AM, Boston Nyer <bostonnyer at gmail.com> wrote:
> 
>> Hello,
>> 
>> I'm looking to clean/rinse cow dung and do not have any experience doing so.  Does anyone have any experience cleaning dung and would like to share?  
>> 
>> Thank you!
>> Boston
>> 
>> -- 
>> Boston
>> Skype: BostonNyer
>> Cell: (585) 503-3459
>> www.burndesignlab.org
>> 
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