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No2 Emission Measurement Calculation


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#1 6chemprocess

6chemprocess

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Posted 15 September 2015 - 08:03 AM

Hello 

 

I would like to seek some guidance on how to Calculate NOx(NO2 basis) in mg/m3:

 

I would like to calculate from known value of NO in mg/ m 3 to NO2 in mg/m3 at reference O2. I don't have ppm values. 

 

NO basis:

NOx(NO ) in mg/m3 = lets assume 800mg/m3 at 7%O2

 

I would like to request an answer for NOx(NO2) in mg/m3 at 6% reference O2

 

I don't know NO,NO2 values in ppm. IF we convert NO to NO2 is that going to be accurate?

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Please check my methodology as shown below. I use the below method to calculate NOx(NO2 basis) emissions.

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My normal calculation method:

I believe below method is more accurate than the above method of conversion because we measure NO and NO2 in ppm and then converting to mg/m3.

I measure NOx from portable gas analyser where I can measure NO in ppm and NO2 in ppm and the device can calculate that as NOx in mg/m3 . This device uses NO2 basis (NO2 molecular weight is used) for final conversion

 

NOx ppm = NO ppm + NO2 ppm(both measured) 

 

NOx mg/m 3 = NOx in ppm X mol.wt of NO2/22.4(molar volume)

 

Then I convert to reference O2

Lets assume measured O2 is 7% for NOx and reference O2 is 6%.

O2 correction = (20.95-Ref O2)/(20.95-Measured O2) 

O2 correction = 1.0716

 

Final equation NOx(NO2) mg/m 3 = NOx(NO2) mg/m3 * (O2 correction factor 1.0716)

 

 

Please let me know your opinion. 

 

Thanks



#2 Bobby Strain

Bobby Strain

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Posted 15 September 2015 - 10:08 PM

I would try Google. And look for some EPA source. Such as "epa nox emission calculation".

 

Bobby






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