[Terrapreta] Fw: new address to the simple kiln

[Sean K. Barry]

Hi Kurt, Philip, Tom, Terra Preta List et al.,

There is one caveat which should be mentioned, I think.  This statement below refers to equilibrium reactions that occur when pulling the hot combustion gases past hot charcoal.  Usually this is only done in a down-draft gasifier.  A TLUD is not a down-draft gasifier.  In an updraft gasifier the heat is at the bottom and the fuel load is above, so the gases are rise up through successively colder biomass particles.  The equilibrium reactions do not occur.  Now, which is occurring in Folke's upside down downdraft gasifier?  Are hot combustion gases pulled through hot charcoal or through the cold fuel load?

Regards,

SKB
----- Original Message ----- 
From: Sean K. Barry<mailto:sean.barry at juno.com> 
To: Kurt Treutlein<mailto:rukurt at westnet.com.au> ; Philip Small<mailto:psmall2008 at landprofile.com> ; Thomas Reed<mailto:tombreed at comcast.net> 
Sent: Tuesday, May 27, 2008 11:41 PM
Subject: Re: [Terrapreta] new address to the simple kiln


Hi Kurt,

Yes, Philip with one 'l' is correct.  I am wrong.  Here is a quote from "The Encylopedia of Biomass Thermal Conversion", page I-14 ...

A series of reactions involving carbon, hydrogen, and oxygen are highly endothermic above about 500C;  in these reactions the initial combustion products H2O and CO2 are reduced to form the fuel gases H2 and CO2

7 cents ... $50

Regards,

SKB
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