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

Sat Mar 15 14:12:02 CDT 2014

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.
>> 
>>  
>> 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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