Where:
%O2 = O2 concentration of the air/oxygen mixture used in the Claus burner, percent by volume (dry basis);
20.9 = O2 concentration in air, percent dry basis;
Qair = Volumetric flow rate of ambient air used in the Claus burner, dscfm;
%O2,oxy = O2 concentration in the enriched oxygen stream, percent dry basis; and
Qoxy = Volumetric flow rate of enriched oxygen stream used in the Claus burner, dscfm.
Where:
Qadj = Volumetric flow rate adjusted to 0 percent excess air, dry standard cubic feet per minute (dscfm);
Cmeas = Volumetric flow rate measured by the flow meter corrected to dry standard conditions, dscfm;
20.9c = 20.9 percent O2-0.0 percent O2 (defined O2 correction basis), percent;
20.9 = O2 concentration in air, percent; and
%O2 = O2 concentration measured on a dry basis, percent.
Where:
Cave = Flow weighted average concentration of the pollutant, ppmv (dry basis, zero percent excess air). The pollutant is either SO2 (if complying with the SO2 emission limit in § 60.102a(f)(1)(i) or (f)(2)(i) ) or reduced sulfur compounds (if complying with the reduced sulfur compounds emission limit in § 60.102a(f)(1)(ii) or (f)(2)(ii) );
N = Number of release points within the group of release points from the sulfur recovery plant for which emissions averaging is elected;
Cn = Pollutant concentration in the nth release point within the group of release points from the sulfur recovery plant for which emissions averaging is elected, ppmv (dry basis, zero percent excess air);
Qadj,n = Volumetric flow rate of the nth release point within the group of release points from the sulfur recovery plant for which emissions averaging is elected, dry standard cubic feet per minute (dscfm, adjusted to 0 percent excess air).
Note: Determine all averages as the arithmetic average of the applicable 1-hour averages, e.g., determine the rolling 12-hour average as the arithmetic average of 12 contiguous 1-hour averages.
40 C.F.R. §60.106a