Dear Frank
I spend (too much) time talking to people selling instruments so if you have something in particular let me bounce it off some suppliers. A couple of students at The Univ of Waterloo just got and are installing an FTIR machine and already have a huge GC. It is connected to a GEC gasifier then what amounts to a large charcoal filter. They are going to attempt to get almost real-time gas analysis and then the evolution of flames when flame-catalysts are injected into it (natural gas in that case). The have a most interesting gas sampling probe made from a quartz tube with a 0.2 mm diameter hole in it, with the sample line maintained at -0.7 bars. Pulling in the gas in this manner pretty much stops all gas reactions that would otherwise continue in the sample tube. I have long suspected this is happening in the diluter at the lab because the CO is too low, consistently. I think at least some of it is burning to CO2. In other words the CO/CO2 ratio in the stack is not as good as it is in the diluter. Because the main purpose of the diluter is to get particles, there is not much we can do except use nitrogen instead of air as a dilutant but that is impossibly expensive. They can sample different points in the flame and using the GC can determine how the combustion is progressing. Regards Crispin Thanks for this doc. Real useful. I find it interesting that many analyzers leave out one measurement so to make it easy to always add up to 100%. CO2 is really easy to measure. We are looking for a new CO2 analyzer so I appreciate all the recent info from Crispin and Marc. Thanks Frank
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