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19:29 Aug 14, 2006
This question was closed without grading. Reason: No acceptable answer
English to English translations [PRO] Tech/Engineering - Chemistry; Chem Sci/Eng / gas concentration
English term or phrase:excess air level
gaseous concentrations: The mass of a particular gas per unit volume of dry gas in the enclosed gas stream, unless otherwise stated.
If expressed by volume, these concentrations could be standardized by using a reference excess air level (for example: 3% oxygen)
concentrations are standardized by expressing them at reference excess air level
01:36 Sep 8, 2006
This is to discard pollutant concentration fluctuations resulting from changes in air or oxygen supply in the burning process. 3% oxygen means that the effluent gas contains 3% of oxygen; without excess air, there should theoretically be no oxygen. With more air/oxygen, the pollutant concentration would be lower but this is not useful information so we eliminate it.
Thank you for the link, VPUHING. I will now close the question.