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

[Dean Still]

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.
>>
>>
>>
>> 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
>>
>>  _______________________________________________
>> 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 addressstoves at lists.bioenergylists.org
>
> to UNSUBSCRIBE or Change your List Settings use the web pagehttp://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/f02edf7f/attachment.html>