[Terrapreta] Strong warning against "simple" charcoal kilns

[MFH]

If O2 has dropped recently from 21% of air at sea level to 19% I guess were
in deeper trouble than I thought.

 

Max H

 

 

  _____  

From: terrapreta-bounces at bioenergylists.org
[mailto:terrapreta-bounces at bioenergylists.org] On Behalf Of Sean K. Barry
Sent: Monday, 28 April 2008 3:23 PM
To: Kurt Treutlein
Cc: terrapreta
Subject: Re: [Terrapreta] Strong warning against "simple" charcoal kilns

 

Hi Kurt,

 

I'm sorry about the verbiage that I have so generously trimmed for you now.
You people want to over-simplify this issue, I think.  The Methane-CH4
ejecting from a charcoal forming pyrolysis reaction does not necessarily all
burn up, as you suggest.  It can't.  "Open-air" reduction of H2 and CO in
the "producer gas" will use as much as 5 times the amount of oxygen as the
CH4 will BEFORE the CH4 will reduce.

 

When the ignition temperature for CO and H2 has been reached AND there is a
steady supply of enough Oxygen, then ...

 

10CO + 10H2 + 10O2 => 10CO2 + 10H2O, first!

 

Then, AFTER THIS, if there is any oxygen is left and if the temperature is
high enough

 

CH4 + 2O2 => CO2 + 2H2O

 

The likelihood of there being enough oxygen at 19% concentration in air and
at atmospheric pressures, is, I think, quite low after the CO and H2 burn
(FIRST!).

 

Regards,

 

SKB

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