[Stoves] [Gasification] CO/CO2 compositions from equilibrium and pyrolysis...

[AJH]

On Sun, 29 Oct 2006 17:44:07 -0700, Thomas Reed wrote:

>I believe that once a C is attached to and O as in C6H12O6 sugars and 
>C6H10O5 cellulose and starch, it is released as CO during pyrolysis.  
>This accounts for the high CO at pyrolysis temperataure (450 C).
>
>Lots of mysteries remain.

I was surprised to see the high CO you quoted but you did qualify this
by saying you were seeing temperatures of 700C in a tlud device. I
commonly see lower temperatures than this but it may be because the
thermocouple is under  reading as it re radiates heat.

If the higher temperature is right then some reduction of CO2 from the
initial char burning would happen. At lower temperatures this seems
unlikely.

From my memory of the structure of cellulose I thought there were only
hydrogen atoms and hydroxyl groups attached to the carbon, no direct
CO bonding so I had not thought CO would be a direct pyrolysis
product.

AJH