Tasliman,
Both C + O2---> CO2 AND C + H2O ---> CO + H2 are occuring. Biomas contains
the water in bound and free state, while it is added via steam in the case of
coal gasification. In my opinion, the water gas phase shift is the most
important reaction and control of it is critical in the next generation of
gasification making high power gas and alcohol fuels.
Toby Seiler
Seiler Technical Co.
________________________________
From: "[email protected]"
<[email protected]>
To: [email protected]
Sent: Friday, February 10, 2012 1:00 PM
Subject: Gasification Digest, Vol 18, Issue 8
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Today's Topics:
1. coal gasification, where did the hydrogen come from? (Tasliman)
2. Re: coal gasification, where did the hydrogen come from?
([email protected])
3. Re: coal gasification, where did the hydrogen come from?
(Thomas Reed)
Dear list
I must write a brief explanation about biomass and coal gasification. I am
confused when I must explain hydrogen production from gasification. I can
understand quite well about biomass gasification, because biomass contains H in
their chains. But I still have no idea when many authors wrote about producing
Hydrogen from coal.
AFAIK coal is mainly carbon, but many wrote this reaction, concerning oxygen
gasification
C + O2 --> CO2
C + 1/2 O2 --> CO
H + 1/2 O2 --> H2O
my question is where does the hydrogen in that reaction come from if it is not
a steam gasification?
Or it should be a steam gasification ?
Thank you,
Tasliman
Coal gasification usually is with steam to make it more efficient and the
reaction C+H2O->CO+H2 is used, and as you correctly point out, it is steam
gasification.
Tom Taylor
In a message dated 2/9/12 10:59:42 PM, [email protected] writes:
Dear list
I must write a brief explanation about biomass and coal gasification. I am
confused when I must explain hydrogen production from gasification. I can
understand quite well about biomass gasification, because biomass contains H in
their chains. But I still have no idea when many authors wrote about producing
Hydrogen from coal.
AFAIK coal is mainly carbon, but many wrote this reaction, concerningoxygen
gasification
C + O2 --> CO2
C + 1/2 O2 --> CO
H + 1/2 O2 --> H2O
my question is where does thehydrogenin that reaction come from if it is not a
steam gasification?
Or it should be a steam gasification ?
Thank you,
Tasliman
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Dear Tasliman and all
You left out
CO + H2O ==> CO2 + H2.
Which is the "Watergas Shift" reaction.
The energy (enthalpy) change is very close to zero. It is favored for entropy
reasons below about 700C over an iron or cobalt catalyst. It is a very
important reaction, see Wikipedia .
Tom Reed
Dr Thomas B Reed
The Biomass Energy Foundation
www.Woodgas.com
On Feb 10, 2012, at 12:52 AM, Tasliman <[email protected]> wrote:
Dear list
>I must write a brief explanation about biomass and coal gasification. I am
>confused when I must explain hydrogen production from gasification. I can
>understand quite well about biomass gasification, because biomass contains H
>in their chains. But I still have no idea when many authors wrote about
>producing Hydrogen from coal.
>
>AFAIK coal is mainly carbon, but many wrote this reaction, concerning oxygen
>gasification
>
>C + O2 --> CO2
>C + 1/2 O2 --> CO
>H + 1/2 O2 --> H2O
>
>my question is where does the hydrogen in that reaction come from if it is not
>a steam gasification?
>Or it should be a steam gasification ?
>
>Thank you,
>Tasliman
>
>
>
>
>
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>to Send a Message to the list, use the email address
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>to UNSUBSCRIBE or Change your List Settings use the web page
>http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org
>
>for more Gasifiers, News and Information see our web site:
>http://gasifiers.bioenergylists.org/
>
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