Analysis of carbon dioxide and hydrogen
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Question 1: To analyze carbon dioxide, whose concentration is around 95%, can it be measured using an oxymeter? Are there any other methods? Question 2: The hydrogen content is between 50% and 90% – what is the appropriate method for detection? The prices of these two instruments above should not be too high. It is convenient to use.
GC will do; I’m not sure what constitutes being cheaper, unless you want to use a portable instrument, but currently it’s not possible to detect gases at high concentrations
Since the precision requirement is not high, Oxy-type gas analysis instruments can be used. Hydrogen can be analyzed using chromatography, but the cost is a bit high. It will cost around over 30,000. But the chromatography used to analyze hydrogen can also be used to analyze CO2
It’s difficult to determine 95% CO2 levels using an austemometer, as the concentration is too high; this can easily lead to backflow during absorption. It’s better to use chromatography for this purpose!
It’s not very good to use an austenometer to absorb 95% of carbon dioxide! The error is large; gas chromatography is an excellent choice for this. For CO2 and hydrogen, chromatography can be used, with N2 or Ar as the carrier gas, and a TDX column allows for analysis – it’s very simple.
The concentrations mentioned by the original poster can be analyzed using Oxygen analyzers, as they all involve the analysis of constant values; chemical analysis methods are quite accurate, with relatively small relative errors. Regarding the issue of flushing fluid during carbon dioxide analysis mentioned on floor 4, I don’t have direct experience as I’ve never used an Oxygen analyzer to analyze samples with such high concentrations; therefore I’m not sure. But I’m thinking of using a dilution method, such as diluting the sample by half before conducting the analysis – I wonder if that would work The dilution explosion method using an oxygen analyzer is certainly feasible for high hydrogen contents, as long as there is an excess of oxygen and the hydrogen concentration after dilution exceeds its lower explosive limit. This post was last edited by xwtsq on 2009-4-21 23:06.]
Thank you all for the discussions. For these two gases that I have tested, it is not necessary to monitor them continuously during production; testing once or twice a week should be sufficient. Therefore, it is not feasible to use instruments with high prices. It would be better to use an Ohsawa meter – though it’s not clear whether this will work for determining the concentration levels. I understand a bit better now.
Our unit currently uses an Shimadzu GC-2014 system; the chromatography columns are PQ 1 3X columns connected in series
It’s possible to use a 95% CO2 austenite meter, but one needs to be extremely careful; the slightest carelessness can lead to liquid leakage. Buy a chromatograph and both problems will be solved
Using austenite is not suitable for ensuring accuracy with CO2, but it can be used for 95% concentration levels. We used a 33% NaOH absorption solution for absorption. Use GC for H2 as well.
Our unit also uses G2104 columns; the PM20 model works quite well