[Gasification] Steam injected into flame (andy schofield

[Mark Ludlow]

I assume that this applies only to that point in the cycle where char has
already been formed and is never analogous with simply having wetter
feedstock, right?

Mark 

-----Original Message-----
From: gasification-bounces at listserv.repp.org
[mailto:gasification-bounces at listserv.repp.org] On Behalf Of
JBlack9999 at aol.com
Sent: Thursday, July 27, 2006 12:24 AM
To: gasification at listserv.repp.org
Subject: Re: [Gasification] Steam injected into flame (andy schofield


Re - the addition of steam to gasifiers
 
In larger gasifiers, where heat loss is not a significant factor in the
energy balance, steam can be used to control reaction  temperature.  
 
By controlling the steam to air ratio, the heat released by the  exothermic
(heat producing) oxidation reaction of carbon to carbon monoxide  could be 
balanced by the endothermic (requiring heat) reaction of carbon  with steam.

This produces a better carbon burn-out in charcoal  or coal gasifiers while
it 
avoids problems associated with ash  sintering or melting.   It is usually
not 
necessary in biomass  gasifiers, since biomass drying and pyrolysis both 
require heat.    Also the amount of charcoal produced after pyrolysis is
much 
smaller than in  coal gasifiers.
 
John
 
 
 
First Dr. Anderson wrote posing the interesting question about Mr Hao's
gasifiers:

Does the "water gas reaction" (is that the correct  name?) going to come
into play?  What are the gains of injecting the  steam?

Finally Dr Reed Wrote in reply to [Stoves] FW: Steam into a 800 ?C  hot fire
burns stronger;is common known by firemen .  (Thomas Reed):


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