[Stoves] Cuber and size of densifying machines. (no longer Re: The wood and char and fuel "debate" )

[Richard Stanley]

Good point frank,
Its also about getting the fines  to flow in and around the particles fibers etc., without too much pressure. We use a soupy water (only 20 - 30 percent solids usually) as the carrying agent. It requires a  lot  less pressure  --and results in a lot less wear and tear on the much less expensive machine– than high pressure screw ram melting lignin or even the eccentric roller within a screen die mill. But its a lot less sexy too…
Richard 


On Mar 6, 2014, at 2:03 PM, Frank Shields wrote:

Agree too
 
If we know both the bulk density and then add the particle density we will be able to determine the air voids in the pile of pellets.
Particle density can be determined using #20 silica sand flowing around the pellets. Easy.
 
 
 
 
 
From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of Crispin Pembert-Pigott
Sent: Thursday, March 06, 2014 9:38 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" )
 
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

 
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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