[Gasification] Gasification Digest, Vol 18, Issue 8

[Toby Seiler]

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: "gasification-request at lists.bioenergylists.org" <gasification-request at lists.bioenergylists.org>
To: gasification at lists.bioenergylists.org 
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?
      (LINVENT at aol.com)
  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, emtaz2010 at gmail.com 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 <emtaz2010 at gmail.com> 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 UNSUBSCRIBE or Change your List Settings use the web page
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>
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>
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