Sarbagya,
I want to encourage your research on modelling cookstoves in Nepal.
Please be aware of the Improved Cookstoves called TLUDs and the newest
(and major) variation called TChar (TLUD top and Charcoal stove base).
(TChar is described in 3 documents at www.drtlud.com and is
the focal point of some stove initiatives in Uganda and Haiti.) Some
studies of TLUD stove issues in Nepal have been conducted, with
favorable results, but limited by lack of funding in the recent past.
The TLUD stoves (including the TChar variation) can utilize dung
briquette fuels very well. In India I successfully experimented with
"dung tablets" that are easy to make in sizes such as rectangles that
are 2 - 3 cm on each side and about 1.5 to 2.5 cm thick.
I hope that your modelling will include the TLUD approach to using
dung as fuel.
Members of this Stoves Listserv would appreciate knowing more about
you, your university, and objectives and methods.
Doc
--
Paul S. Anderson, PhD
Known to some as: Dr TLUD Doc Professor
Phone (USA): 309-452-7072 SKYPE: paultlud Email: [email protected]
www.gtz.de/de/dokumente/giz2011-en-micro-gasification.pdf (excellent ref.)
My website specific for TLUD information: www.drtlud.com = www.DrTLUD.com
Quoting SARBAGYA TULADHAR <[email protected]>:
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
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