[Stoves] locally produced pellet

ajheggie at gmail.com ajheggie at gmail.com
Thu Mar 6 05:01:40 CST 2014


[Default] On Thu, 06 Mar 2014 13:20:09 +0300,Bjarne Laustsen
<bjarne at kiwlau.com> wrote:

>AJH
>We are not looking for making less dense briquettes in wet process.
>I do not believe that they will work in a gasifier stove. The will also 
>be too lose to be transported so a lot of waste.
>We will make high density briquettes in mechanical piston presses.

Bjarne

Tom Miles has described the various phenomena that hold a dense pellet
together and the amount of power needed, about 2.5% of the pellet's
calorific value?? I normally consider motive power to be worth about 3
times thermal power so it becomes a high moderate proportion of the
pellet's energy just to press it and the payback when used locally is
less than when the increased bulk density aids transport.

I am familiar with the way ring dies compress a thin layer at a time,
in order to collapse the cell structure and allow the particles to
become intimately in contact for hydrogen bonding and lignin flow for
coherence and I have read about Shimada screw presses but I am not
familiar with mechanical piston presses other than one which made 50mm
pucks from sawdust. These pucks looked similar to pellets from a ring
die apart from being 8 times bigger in diameter and they appeared more
distinctly layered.

AJH




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