Detection standards for nitrogen oxides in flue gas
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According to GB13223-2011, nitrogen oxides in the exhaust gases are expressed in terms of NO2. However, I have seen many empirical calculation values as well as results from Factsage simulations, indicating that the proportion of NO accounts for over 90% of the total nitrogen oxides. So the question is, when implementing environmental emission standards, which approach should be followed: 1. Consider only the level of NO2, ignoring NO? 2. Multiply the NO2 content by a certain coefficient? 3. Convert NO to NO2 using a certain algorithm? Or any other explanation? I beg for your advice
Nitrogen oxides should be the general term for NOx, right?
NOx is composed of NO, NO2, and some other components, with NO accounting for 95% and NO2 accounting for 5%. During the generation process, NO is oxidized to NO2
I know that. Currently, there are NO and NO2; as specified in the national standards (calculated based on NO2), how is this implemented? Is NO ignored, or is it converted using a certain ratio?
I know that. Currently, there are NO and NO2; the national standards specify (based on NO2) how this should be implemented – whether to ignore NO or convert it using a certain ratio.
The NO produced during the combustion process theoretically converts into NO2 at temperatures lower than those of the exhaust gases; in practice, however, it takes a long time for NO to transform into NO2. Therefore, instruments measure NO, and it is necessary to convert NO into NO2 (since NO2 is the pollutant that is ultimately released into the atmosphere). This is also the reason why national standards specify measurement in terms of NO2.
May I ask about the book or standard you are referring to? Thank you
Is 95% NO and 5% NO2 the standard specification? Is there a source for this?