[Gasification] Gas Sampling

Doug doug.williams.nz at gmail.com
Wed Jun 28 19:29:59 CDT 2017

Hi Indika,

The short answer to your question is no, water vapor as you describe 
will not result in lowering the CO content of your gas sample. It is not 
clear if you expect to get 50% CO from your gas, which when analyzed has 
a lower CO content. I have never seen producer gas with 50% CO content, 
but if you had a directly coupled gas analyzer measuring continuously, 
you could expect to see fluctuations depending on the system design and 
variation of fuel being gasified. Any gas sample is only valid for the 
moment in time that it was taken, but the key is to minimize, or 
understand why the system fluctuates.

We have had gas analysis done over 35 years, and samples collected in 
metal, glass, and gas  bags, in each case water was used to collect the 
sample by drainage suction. None of the measuring laboratories had 
issues with residue moisture affecting the results. The only exception 
to the containment limitations, were the gas bags, where-by the analysis 
must be done within three days due to the H2 content escaping through 
the bag walls.

Hope this might help.

Doug Williams,


On 28/06/17 07:57, Indika Gallage wrote:
> *Question:*
> I have been using gas chromatography to analyse the producer gas 
> mixture*. I would like to know, if the gas sample extracted from the 
> gasifier will change it’s CO composition significantly with the 
> presence of water vapor*? We have to sample a gas with 50% CO.
> I have gone through a research paper where they suggest that the 
> composition will not significantly vary, but these samples did not 
> have the high concentration of CO. However, the content of CO had the 
> most variation out of all the gasses, the conclusion of this paper was 
> that the gasses did not change composition at -15 C, 15c , 45C at 2758 
> and Kpa 8274 Kpa pressure. (“Evaluation of syngas storage under 
> different pressures and temperatures”,  Yang P,2009, Applied 
> Engineering in Agriculture)
> can some one shed some light on this?

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