[Gasification] Gas Sampling

l linvent at aol.com
Thu Jun 29 14:54:07 CDT 2017

CO will only breakdown to C and CO2 at elevated temperatures, called the Bourdard reaction. At gas sampling temperatures, it should be quite stable for a long time. There are continuous gas analyzers that can measure every molecule or atom in real time and miss many that are not considered in normal gas analyses such as methanol, acetic acid, ethanol, and other complex organic compounds produced by gasifiers. 50% CO could be possible under a pure steam fired gasifier, but is doubtful, and the wiggle room of not being able to measure it leads to further incredulity of their claim. 


Leland T. "Tom" Taylor
Thermogenics Inc. 
Skype: ltt.invent

-----Original Message-----
From: Indika Gallage <indika at efpl.org>
To: 'Discussion of biomass pyrolysis and gasification' <gasification at lists.bioenergylists.org>
Sent: Thu, Jun 29, 2017 9:16 am
Subject: Re: [Gasification] Gas Sampling

Hello Doug,
The gasifier has not been tested yet, but the designers claim to have 50% CO in the gas with previous gasifiers, which was unimaginable to me. When we were speaking of sampling the gas, we have been warned that the CO of the gas may convert while sampling. This is why  I am researching on the fact. 
Certainly, the most sensible thing is a directly coupled gas analyser. The equipment is rather costly; we will have to use the inline measurements if we get lower readings from sampling to confirm.
Thank you for your time and a very clear explanation.
Best Regards 

From: Gasification [mailto:gasification-bounces at lists.bioenergylists.org] On Behalf Of Doug
Sent: June 28, 2017 8:30 PM
To: gasification at lists.bioenergylists.org
Subject: Re: [Gasification] Gas Sampling

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:

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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