Sarbagya and list:
I tried googling for your project and found something almost a
year ago from Josh Wilkey on this list. I think we can help you a
lot more if your team has produced a report. Since you are doing
CFD, it would be helpful to know what you have been learning from
that. Have you optimized anything yet?
Since you are using the Servals unit and only getting 12 minutes
at a time, it is obvious that you need to densify. - which
presumably means pelletizing. Since you are intending operations
in Nepal, and maybe rural Nepal, maybe you have discarded that
option. But I would look
You scare me when you use a sentence like this (from below - and
similar was used by Josh):
"So what could be the heat output from burning 1 kg. of dung."
Are you truly "burning" - which I take to mean no char output?
Can you give us some more ideas on what you have already learned
from your experiments? Are you getting (or could you obtain) about
25% char yiel
You asked below about energy content of the dung per kg. I think
it must be about 15-18 MJ - depending on the ash content.
I worry a great deal about "burning" dung. The whole point of
making char is to improve the soil and maybe especially in Nepal.
But Char from dung can be of extra value - as proven in numerous
soil experiments. Is you team into the soil side of char at all?
I hope that the word "burn" is a misnomer.
You asked about the flame temperatures. This will be strongly
dependent on the excess air you are getting. Can you supply any
data on the weight of a fuel load that lasts 12 minutes? What is
the volume of the fuel space and the shape (and density) of that
fuel. I would think your own tests could supply temperature data -
using thermocouples.
I would look closely at the Georgia Tech computations of the
last few days on this list and see if they might not answer some of
your questions.
For others - the Servals unit is a nice looking commercial TLUD
unit from Chennai India, developed with Paul Anderson. See
http://servalsgroup.blogspot.com/
and
http://www.slideshare.net/bitmaxim/servals-tlud-biomass-stove-deck
(and there are more)
I have seen some technical data in these, but assume there must
be a good bit more. Paul?
Ron
From: "Sarbagya Tuladhar" <[email protected]>
To: "Paul S. Anderson" <[email protected]>
Cc: "Discussion of biomass cooking stoves" <[email protected]>
Sent: Saturday, March 17, 2012 5:37:57 PM
Subject: Re: [Stoves] Cleaning Dung
Hi Paul,
Dung burning using TLUD as a project had been conducted by the
final year students of uni of Adelaide of which I was lucky to be a
part of. This project was conducted under the EWB Australia
humanitarian undergraduate project. Excellent work was done on
this. I would very much try to incorporate their findings in my
report.
Cheers
Sarbagya
Sent from my iPhone
On 18/03/2012, at 7:00 AM, "Paul S. Anderson" <[email protected]> wrote:
> 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
>
>
> ----------------------------------------------------------------
> This message was sent using Illinois State University RedbirdMail
>
>
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