Where:
ELS = Emission limit for large sulfur recovery plant, ppmv (as SO2, dry basis at zero percent excess air);
k1 = Constant factor for emission limit conversion: k1 = 1 for converting to the SO2 limit for a sulfur recovery plant with an oxidation control system or a reduction control system followed by incineration and k1 = 1.2 for converting to the reduced sulfur compounds limit for a sulfur recovery plant with a reduction control system not followed by incineration; and
%O2 = O2 concentration of the air/oxygen mixture supplied to the Claus burner, percent by volume (dry basis). If only ambient air is used for the Claus burner or if the owner or operator elects not to monitor O2 concentration of the air/oxygen mixture used in the Claus burner or for non-Claus sulfur recovery plants, use 20.9% for %O2.
Where:
ESS = Emission limit for small sulfur recovery plant, ppmv (as SO2, dry basis at zero percent excess air);
k1 = Constant factor for emission limit conversion: k1 = 1 for converting to the SO2 limit for a sulfur recovery plant with an oxidation control system or a reduction control system followed by incineration and k1 = 1.2 for converting to the reduced sulfur compounds limit for a sulfur recovery plant with a reduction control system not followed by incineration; and
%O2 = O2 concentration of the air/oxygen mixture supplied to the Claus burner, percent by volume (dry basis). If only ambient air is used in the Claus burner or if the owner or operator elects not to monitor O2 concentration of the air/oxygen mixture used in the Claus burner or for non-Claus sulfur recovery plants, use 20.9% for %O2.
Where:
ERNOx = Daily allowable average emission rate of NOX, lb/MMBtu (higher heating value basis);
Qgas = Daily average volumetric flow rate of fuel gas, standard cubic feet per day (scf/day);
Qoil = Daily average volumetric flow rate of fuel oil, scf/day;
HHVgas = Daily average higher heating value of gas fired to the process heater, MMBtu/scf; and
HHVoil = Daily average higher heating value of fuel oil fired to the process heater, MMBtu/scf.
Where:
ERNOx = Daily allowable average emission rate of NOX, lb/MMBtu (higher heating value basis);
Qgas = Daily average volumetric flow rate of fuel gas, scf/day;
Qoil = Daily average volumetric flow rate of fuel oil, scf/day;
HHVgas = Daily average higher heating value of gas fired to the process heater, MMBtu/scf; and
HHVoil = Daily average higher heating value of fuel oil fired to the process heater, MMBtu/scf.
40 C.F.R. §60.102a