[Stoves] Cleaning Dung

Mon Mar 19 00:34:40 CDT 2012

Hi Stovers,

Just veering off the topic of dung for a moment, has anyone got any kind of
data on the air velocity for natural convection stoves.. Any kind of data
would be useful ? Could be air velocity at the cooktops or the chimney ? I
suppose the max velocity would be at the chimney area due to the chimney
effect (draft)..

Cheers

Sarbagya

On Mon, Mar 19, 2012 at 4:27 PM, Sarbagya Tuladhar <sarbagya007 at gmail.com>wrote:

> Interesting indeed. However stink is not as much a problem when dried
> completely. Even with the dung briquettes, the stink is no more when dried.
> However, the case with pyrolyzing the dung and releasing the hamrful
> toxins, if the smoke and aroma can be removed then thats certainly worth a
> try. Any more info on Francis of Kenya ?
>
> Cheers
> Sarbagya
>
> On Mon, Mar 19, 2012 at 12:16 PM, Richard Stanley <
> rstanley at legacyfound.org> wrote:
>
>> This is interesting. Out in Miumbuni village, about 2hrs east of Nairobi
>> and another hr off the Mombassa road, is a one Francis Kavita who has been
>> working with the Masaai in developing cow dung based briquettes that do not
>> stink: He has developed same with elephant dung in south Eastern Kenya
>> (near Tasavo)  and is now breaking ground with camel dung based blends for
>> use in the refugee camps in Somalia. He has tested them and he says the
>> work well without smoke or aroma.
>> He has no numbers for
>> what he ahas done but is still far more experience than anyone else,
>> including all the Phd students we know of. If he says it will work I
>> believe it:
>>
>> We started him in briquette making in 1999, and trained he and his wife
>> Mary in 2007 as trainers and they have been all over east Africa training
>> others–on their own–, ever since.  The problem is not that it works or does
>> not work, Its a case of what we need to be convinced of it. The Phd study
>> or   Francis' experience. After all he only has a 4th grade education.
>>
>> Alternatively, can we evolve a more balanced discovery model with due
>> respect for the unique contributions of knowledge and experience that *
>> both* have to offer.
>>
>> Richard Stanley
>> www.legacyfound
>> ==========
>>
>>
>>
>> On Mar 16, 2012, at 9:26 PM, SARBAGYA TULADHAR wrote:
>>
>> 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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>>>
>>> --
>>> ***
>>> Dr. A.D. Karve
>>> Trustee & Founder President, Appropriate Rural Technology Institute
>>> (ARTI)
>>>
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>>
>> --
>> ***
>> Dr. A.D. Karve
>> Trustee & Founder President, Appropriate Rural Technology Institute (ARTI)
>>
>>
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