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 <[email protected]>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 < > [email protected]> 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 < >> [email protected]> 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 < >>> [email protected]> 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 <[email protected]> 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 >>>> >>>> _______________________________________________ >>>> Stoves mailing list >>>> >>>> to Send a Message to the list, use the email address >>>> [email protected] >>>> >>>> to UNSUBSCRIBE or Change your List Settings use the web page >>>> >>>> http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org >>>> >>>> for more Biomass Cooking Stoves, News and Information see our web site: >>>> http://www.bioenergylists.org/ >>>> >>>> >>>> _______________________________________________ >>>> Stoves mailing list >>>> >>>> to Send a Message to the list, use the email address >>>> [email protected] >>>> >>>> to UNSUBSCRIBE or Change your List Settings use the web page >>>> >>>> http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org >>>> >>>> for more Biomass Cooking Stoves, News and Information see our web site: >>>> http://www.bioenergylists.org/ >>>> >>>> >>>> >>> >>> >>> -- >>> *** >>> Dr. A.D. Karve >>> Trustee & Founder President, Appropriate Rural Technology Institute >>> (ARTI) >>> >>> >>> _______________________________________________ >>> Stoves mailing list >>> >>> to Send a Message to the list, use the email address >>> [email protected] >>> >>> to UNSUBSCRIBE or Change your List Settings use the web page >>> >>> http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org >>> >>> for more Biomass Cooking Stoves, News and Information see our web site: >>> http://www.bioenergylists.org/ >>> >>> >>> >>> _______________________________________________ >>> Stoves mailing list >>> >>> to Send a Message to the list, use the email address >>> [email protected] >>> >>> to UNSUBSCRIBE or Change your List Settings use the web page >>> >>> http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org >>> >>> for more Biomass Cooking Stoves, News and Information see our web site: >>> http://www.bioenergylists.org/ >>> >>> >>> >> >> >> -- >> *** >> Dr. A.D. Karve >> Trustee & Founder President, Appropriate Rural Technology Institute (ARTI) >> >> >> _______________________________________________ >> Stoves mailing list >> >> to Send a Message to the list, use the email address >> [email protected] >> >> to UNSUBSCRIBE or Change your List Settings use the web page >> >> http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org >> >> for more Biomass Cooking Stoves, News and Information see our web site: >> http://www.bioenergylists.org/ >> >> >> _______________________________________________ >> Stoves mailing list >> >> to Send a Message to the list, use the email address >> [email protected] >> >> to UNSUBSCRIBE or Change your List Settings use the web page >> >> http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org >> >> for more Biomass Cooking Stoves, News and Information see our web site: >> http://www.bioenergylists.org/ >> >> >> >> _______________________________________________ >> Stoves mailing list >> >> to Send a Message to the list, use the email address >> [email protected] >> >> to UNSUBSCRIBE or Change your List Settings use the web page >> >> http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org >> >> for more Biomass Cooking Stoves, News and Information see our web site: >> http://www.bioenergylists.org/ >> >> >> >
_______________________________________________ Stoves mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org for more Biomass Cooking Stoves, News and Information see our web site: http://www.bioenergylists.org/
