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

[Frank Shields]

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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