[Stoves] Gel Fuel Emissions

[Crispin Pemberton-Pigott]

Dear Frank

The heat content of the rice husks is well known - HHV of about 14 MJ/Kg

Roger Samson (who I finally got a chance to meet last Saturday morning) says
that the waste product from the Mayon Turbo stove which is ostensibly a
gasifier, has 62% silicon.  I worked out that the carbon in it was worth a
little over 9 MJ/Kg of 'char' based on the carbon content.

The char is 29% of the initial fuel mass, but that might be based on a 14%
typical moisture content in the original fuel.

More understanding is needed on this.

Roger??

Thanks
Crispin in JHB

-----Original Message-----
From: frank [mailto:frank at compostlab.com] 
Sent: January 10, 2008 7:41 PM
To: crispin at newdawn.sz; Discussion of biomass cooking stoves
Subject: Re: [Stoves] Gel Fuel Emissions

Dear Crispin,

I could not find your EMail of a few weeks ago but if I remember 
correctly you were asking about rice hulls and the ash content. Saying 
you thought it was around 20% or higher. (?)

Some recent work I did showed the ash to be 20.6% dry wt so the organic 
fraction is 79.4% dw.  BUT then the Carbon is found to be only 26.7%dw 
and it should be ~40% for organic biomass ash free.. I think what is 
happening is going from 105 degC for moisture to 550 deg. C for organic 
matter/ash determination more water  from hydration is coming off. 
(?)..  Rice is real different than any other 'small' fuel I have seen 
and Silica does strange things -complicated. I see this coating inside 
of water pipes etc. If the above is true you are right in thinking the 
ash is really higher than the test shows and we need to rethink the 
energy we get from Rice to a much lower value.

Frank



-- 
Frank Shields
Soil Control Lab
42 Hangar way
Watsonville, CA  95076
(831) 724-5422 tel
(831) 724-3188 fax
frank at compostlab.com
www.compostlab.com



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