[Stoves] Pellets in Uganda was Re: Cuber and size of densifying machines.
Otto Formo
terra-matricula at hotmail.com
Sat Mar 15 15:06:16 CDT 2014
Dear Ron,
To light a proper Natural Draft Gasifier, you just need a proper starter.
Pellet diped into kerosine will do, or just simple woodshaveings.
The pellet in a Natural Draft gasfier "does not burn" as such, it just turns into (bio)char and only the gases burns about 5 to 10 cm above the biomass .
No need to ingnite the pellet and face the "problems " or challages as for a Rocket stove.
This "brand new" technolgy, known for centuries, compared to the open three stone fire - light from the top to avoid any hassard and hazzel, which will solve most issues conserning smoke and toxic emissions.
Just remember, the more dry and dense fuel, the better......................
Otto
From: rongretlarson at comcast.net
Date: Sat, 15 Mar 2014 13:12:02 -0600
To: stoves at lists.bioenergylists.org
Subject: Re: [Stoves] Pellets in Uganda was Re: Cuber and size of densifying machines.
Dean et al
Was this poor lighting performance in a Rocket or TLUD or other? Do you (or anyone) think it should make a difference? And would 1/4” pellets of same density have the same problem? If not - what is the reason for a size difference?
Anyone using a pellet stove for space heating able to say anything on problems with larger and/or more dense pellets? Are there warnings on the size of pellets for pellet-type space heaters?
Ron
On Mar 15, 2014, at 11:18 AM, Dean Still <deankstill at gmail.com> wrote:Hi Paul,
The pellets were about one inch in diameter and very dense. Hard to light and went out easily.
Best,
Dean
On Sat, Mar 15, 2014 at 8:37 AM, Paul Anderson <psanders at ilstu.edu> wrote:
Dean,
Please tell us about those pellets: characteristics and source
and used in what stove(s). The experience by Awamu in Uganda
does not agree with your statement. But there could be different
sources and different stoves.
Paul
Doc / Dr TLUD / Prof. Paul S. Anderson, PhD
Email: psanders at ilstu.edu
Skype: paultlud Phone: +1-309-452-7072
Website: www.drtlud.com
On 3/6/2014 1:20 PM, Dean Still wrote:
Hi Tom,
In Uganda the pellets were too dense and were hard to
light. Do you know the density of USA heating stove pellets?
Best,
Dean
On Thu, Mar 6, 2014 at 11:02 AM, Tom
Miles <tmiles at trmiles.com>
wrote:
Richard, You
probably mean 0.6 g/cm3 (37 lb/ft3) which is very
good that’s better than most commercial wood
pellets. For reference the dry density of sawdust is
often about .160 g/cm3 (or 10 lb/ft3). The loose
density of straw is about 0.08 g/cm3 or (5 lb/ft3).
The press roll on a pellet mill exerts about 142
bars (2000 psig). If you can get those densities by
selecting materials, wetting, pressing at 12 bar and
drying you are doing very well.
Tom
From:
Stoves [mailto:stoves-bounces at lists.bioenergylists.org]
On Behalf Of Legacy Found
Sent: Thursday, March 06, 2014 10:46 AM
To: Discussion of biomass cooking stoves
Subject: Re: [Stoves] Cuber and size of
densifying machines. (no longer Re: The wood and
char and fuel "debate" )
Crispin, what densities are you
seeking. We have seen densities of up to 0.6kg/cm^3
by use of really fine granular material charcoal
sawdust and certain other ag residues as infiller in
hand presses generating only about 12 bars pressure.
I have not attempted pellet
production but have no doubt that high pressure is
not needed: Rather its more about attention to
blend particle density and size and variations
between these (sorting coefficients) that makes the
difference density wise.
May look into it if anybody is
interested in the fuel pellet world.
Richard
Sent from my iPhone
On Mar 6, 2014, at 11:38, Crispin Pembert-Pigott
<crispinpigott at outlook.com>
wrote:
Dear
Friends I
agree with Dean on this score. The air flow
through the pellets strongly affects the way
they burn if the device is constructed such
that the fuel contributes a significant
element of air control. These
devices<image002.jpg>
Are
‘cubers’ in that they are producing densified
lumps that can be put into a stove. But they
will work best in a large stove such as is
used in China for space heating and cooking.
The input material is straw and other stover. The
mechanism is an eccentric roller running
inside a perforated cage at maybe 60-100 RPM.
As Tom notes, power consumption is about 110
kW. So
far I don’t think the product is economically
viable as there is a subsidy involved. What we
need is a breakthrough technology that will
make densified fuel without the need for heat. RegardsCrispin
Hi Paul,
I have seen the very
small pellets sold for heating stoves in the
US burn very cleanly. Larger sized pellets
did not burn as cleanly.
Best,
Dean
_______________________________________________
Stoves mailing list
to Send a Message to the list, use the email
address
stoves at lists.bioenergylists.org
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://stoves.bioenergylists.org/
_______________________________________________
Stoves mailing list
to Send a Message to the list, use the email address
stoves at lists.bioenergylists.org
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://stoves.bioenergylists.org/
_______________________________________________
Stoves mailing list
to Send a Message to the list, use the email address
stoves at lists.bioenergylists.org
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://stoves.bioenergylists.org/
_______________________________________________
Stoves mailing list
to Send a Message to the list, use the email address
stoves at lists.bioenergylists.org
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://stoves.bioenergylists.org/
_______________________________________________
Stoves mailing list
to Send a Message to the list, use the email address
stoves at lists.bioenergylists.org
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://stoves.bioenergylists.org/
_______________________________________________
Stoves mailing list
to Send a Message to the list, use the email address
stoves at lists.bioenergylists.org
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://stoves.bioenergylists.org/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.bioenergylists.org/pipermail/stoves_lists.bioenergylists.org/attachments/20140315/3e98cada/attachment.html>
More information about the Stoves
mailing list