| EPA Reference Method #19 defines the F-factor
and its uses for stack emission testing. F-factors can be used
to determine mass emission rates for NOx, SO2, CO, VOC, etc.
using fuel gas content and fuel flow through a calibrated fuel
meter. The F-factor is the ratio of the gas volume of the products
of combustion to the heat content of the fuel. The F-factor
is corrected to standard conditions (68°F and 760 mmHg)
and expressed in the unit of standard cubic feet of exhaust
per million Btu of fuel burned (scf/MMBtu). The F-factor can
be calculated by performing an ultimate analysis on the fuel
by ASTM D3176-74 to get percent weight contents of primary component
of the fuel (i.e. Carbon, Hydrogen, Sulfur, Nitrogen, and Oxygen).
Air Hygiene has simplified this procedure, by
preparing the F-factor datasheet below, which allows the user
to simply enter the mole percent (mol %) of each component
(i.e. methane, ethane, … through octane, nitrogen, oxygen,
helium, etc.) This information is used to calculate the following
fuel parameters:
- F-factor by EPA Reference Method #19
requirements
- Fuel heating values (high, low, dry,
& wet)
- Fuel’s weight percent VOC content
- Molecular Weight of gas
- Specific Gravity of gas
- Btu per pound of gas
- Weight percent of elements in gas
Using the stack exhaust content of oxygen
or carbon dioxide, the F-factor, fuel flow, and the fuel’s
high heating value (dry) emission rates in lb/MMBtu, lb/hr,
and ton/year can be calculated.
This worksheet may be viewed by opening the
*.pdf file or may be used by downloading the excel file (Members
Only).
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