Affected unit means a cement kiln meeting the applicability criteria of this section.
Cement kiln means an installation, including any associated pre-heater or pre-calciner devices, that produces clinker by heating limestone and other materials to produce Portland cement.
Cement plant means any facility manufacturing cement by either the wet or dry process.
Clinker means the product of a cement kiln from which finished cement is manufactured by milling and grinding.
Operating day means a 24-hour period beginning at 12:00 midnight during which the kiln produces clinker at any time.
Equation 1 to Paragraph (d)(1)
Where:
E30D = 30 kiln operating day average emissions rate of NOX, in lbs/ton of clinker.
Ci = Concentration of NOX for hour i, in ppm.
Qi = Volumetric flow rate of effluent gas for hour i, where Ci and Qi are on the same basis (either wet or dry), in scf/hr.
P = 30 days of clinker production during the same Time period as the NOX emissions measured, in tons.
k = Conversion factor, 1.194 *10-7 for NOX, in lb/scf/ppm.
n = Number of kiln operating hours over 30 kiln operating days.
40 C.F.R. §52.42