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# PART 75 CEMS FIELD AUDIT MANUAL: - page 23 / 41

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Appendix A                                                                                  Gas RATA Observation Sheet

c.  NOx lbs/mmBtu Calculation

O2 Diluent - When the NOx continuous emission monitoring system uses O2 as the diluent, and measurements are performed on a dry basis, use the following conversion procedure

When measurements are performed on a wet basis, use the equations in method 19 in appendix A of part 60.

CO2 Diluent - When the NOx continuous emission monitoring system uses CO2 as the diluent, use the following conversion procedure:

When CO2 and NOx measurements are performed on a different moisture basis, use the equations in method 19 in appendix A of part 60.

Where:

E = Pollutant emissions during unit operation, lb/mmBtu

K = 1.194 107 (lb/dscf)/ppm NOx.

Ch = Hourly average pollutant concentration during unit operation, ppm.

%O2, %CO2 = Oxygen or carbon dioxide volume during unit operation (expressed as percent O2 or CO2).

F, Fc = a factor representing a ratio of the volume of dry flue gases generated to the caloric value of the fuel combusted (F), and a factor representing a ratio of the volume of CO2 generated to the calorific value of the fuel combusted (Fc), respectively.

F AND FCFACTORS1

Fuel

F-factor

(dscf/mmBtu)

FC-factor

(scf CO2/mmBtu)

Coal (as defined by ASTM D388-92):

Anthracite

10,100

1,970

Bituminous and subbituminous

9,780

1,800

Lignite

9,860

1,910

Oil

9,190

1,420

Gas:

Natural gas

8,710

1,040

Propane

8,710

1,190

Butane

8,710

1,250

Wood:

Bark

9,600

1,920

Wood residue

9,240

1,830

1 Determined at standard conditions:  20 C (68 F) and 29.92 inches of mercury.

6.  Relative Accuracy Calculations

Part 75 Field Audit Manual - July 16, 2003                                                                                                       Page A-19

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