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

Sat Mar 15 21:11:13 CDT 2014

Hi Ron,

Pellets made in China are also often smoky and hard to use in a TLUD. The
pellet needs to be well made, to a good recipe, to burn cleanly.  Small
size seems to be better.

Best,

Dean

On Sat, Mar 15, 2014 at 1:06 PM, Otto Formo <terra-matricula at hotmail.com>wrote:

> 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.
>
>
> 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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