Hydrogen production desorption gas
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In dry gas hydrogen production units that are now switched to use natural gas, the composition of the desorbed gas suddenly becomes H2: (0.2~18%), CO2: (55%~85%), while CO and CH4 remain at normal levels. Has this kind of situation occurred before? The test results show no problems, and the hydrogen production level hasn’t changed; I’d like some advice
What were the previous hydrogen and carbon dioxide values? Is the adsorption time adjustable? Calculate the conversion rates and change rates before and after, and compare the recovery rates!
All other parameters remain unchanged: the feed rate and hydrogen production volume, as well as the components in the conversion gas, the adsorption time, and pressure are all unchanged. Everything was normal before; the hydrogen level was generally between 20% and 30%, while carbon dioxide accounted for around 50%. The key point is that if the data is accurate, there isn’t much change in the hydrogen production volume. Besides, it wouldn’t be amazing if PSA hydrogen recovery could reach nearly 100%
Look at the differences in the amounts and composition of the two raw materials
I had used natural gas on its own before, and this kind of situation has never occurred. Going to another factory to make a sample gives the same result. Now I wonder if there is some substance in the raw materials that affects the peak value of carbon dioxide, resulting in higher carbon dioxide test results
What is the purity of the product hydrogen? Are there any minor differences? What are the proportions of hydrogen, methane, and nitrogen in the dry gas? What are the contents of hydrogen and methane in natural gas? Current value. The sampling point for the desorbed gas should be fine, right? Has there been any change in the medium airflow rate?
I have ruled out all of the things you mentioned, and no abnormalities were found. It was different back then when natural gas was used; no abnormalities were detected even when using it for sampling now
Is the purity of the product hydrogen confirmed to be fine?
The product hydrogen level has remained quite stable. In recent days, the amount of gas released during desorption hasn’t been that extreme; the hydrogen concentration is between 10% and 20%, but something still seems off: L
There is a theory according to which the hydrogen production amount can be calculated