[Stoves] Pellets in Uganda was Re: Cuber and size of densifying machines.

[Paul Anderson]

Dean,

I do not know of any maker of that size of pellet in Uganda.   I am 
asking Nolbert and Karsten to confirm or comment.   I hope you (Dean) 
can tell us more about where or how you received them, and are there any 
still available to be examined?    And what was the stove type?

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 3/15/2014 12:18 PM, Dean Still 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 
> <mailto: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  <mailto:psanders at ilstu.edu>    
>     Skype: paultlud      Phone:+1-309-452-7072  <tel:%2B1-309-452-7072>
>     Website:www.drtlud.com  <http://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
>>     <mailto: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
>>         <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
>>         <mailto: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.
>>
>>             Regards
>>
>>             Crispin
>>
>>             **
>>
>>             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
>>
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