[Gasification] Blue water gas...... Why bother?

[drew]

The water shift reaction can happen at 500C ?   I would love to hear 
more about it.    Am I correct in saying that a secondary function of 
steam injection/water gas shift at this point could be to quench the 
gas, keeping any CO from converting to CO2 and C (soot)?   
    Does this mean that steam at 750 deg, is not H2O as a gas but two 
separate free gasses, and if so what would be the lowest temp at which 
separation occurs?   

Drew



Thomas Reed wrote:

> Drew and All:
>
> I generally agree - conventional producer gas burns very cleanly, 
> leanly and quickly.
> However, when it leave the charcoal reaction zone the temperature is 
> typically 750 C.  At this temperature the watergas shift reaction is 
> very fast and converts extra H2O according to:
>
> CO + H2O <==> CO2 + H2
>
> This reaction is EXO thermic (and so, free) but at lower temperatures, 
> (500C) for higher conversion you need time and a catalyst.
> I recently posted the thermodynamics of the Boudouard reaction.  Maybe 
> I'll post this too if anyone's interested.
>
> TOM REED      BEF


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