You must calculate and report the annual process CO2 emissions using the procedures specified in either paragraph (a) or (b) of this section.
(a) Calculate and report under this subpart the process or combined process and combustion CO2 emissions by operating and maintaining a CEMS according to the Tier 4 Calculation Methodology in §98.33(a)(4) and all associated requirements for Tier 4 in subpart C of this part (General Stationary Fuel Combustion Sources).
(b) Calculate and report under this subpart the process CO2 emissions by following paragraphs (b)(1) and (b)(2) of this section.
(1) For each Waelz kiln or electrothermic furnace at your facility used for zinc production, you must determine the mass of carbon in each carbon-containing material, other than fuel, that is fed, charged, or otherwise introduced into each Waelz kiln and electrothermic furnace at your facility for each year and calculate annual CO2 process emissions from each affected unit at your facility using Equation GG-1 of this section. For electrothermic furnaces, carbon containing input materials include carbon eletrodes and carbonaceous reducing agents. For Waelz kilns, carbon containing input materials include carbonaceous reducing agents. If you document that a specific material contributes less than 1 percent of the total carbon into the process, you do not have to include the material in your calculation using Equation R-1 of §98.183.
Where:
ECO2k = Annual CO2 process emissions from individual Waelz kiln or electrothermic furnace “k” (metric tons).
44/12 = Ratio of molecular weights, CO2 to carbon.
2000/2205 = Conversion factor to convert tons to metric tons.
(Zinc)k = Annual mass of zinc bearing material charged to kiln or furnace ”k” (tons).
(CZinc)k = Carbon content of the zinc bearing material, from the annual carbon analysis for kiln or furnace “k” (percent by weight, expressed as a decimal fraction).
(Flux)k = Annual mass of flux materials (e.g., limestone, dolomite) charged to kiln or furnace “k” (tons).
(CFlux)k = Carbon content of the flux materials charged to kiln or furnace “k”, from the annual carbon analysis (percent by weight, expressed as a decimal fraction).
(Electrode)k = Annual mass of carbon electrode consumed in furnace “k” (tons).
(CElectrode)k = Carbon content of the carbon electrode consumed in furnace “k”, from the annual carbon analysis (percent by weight, expressed as a decimal fraction).
(Carbon)k = Annual mass of carbonaceous materials (e.g., coal, coke) charged to the kiln or furnace “k”(tons).
(CCarbon)k Carbon content of the carbonaceous materials charged to kiln or furnace, “k”, from the annual carbon analysis (percent by weight, expressed as a decimal fraction).
(2) You must determine the CO2 emissions from all of the Waelz kilns or electrothermic furnaces at your facility using Equation GG-2 of this section.
Where:
CO2 = Annual combined CO2 emissions from all Waelz kilns or electrothermic furnaces (tons).
ECO2k = Annual CO2 emissions from each Waelz kiln or electrothermic furnace k calculated using Equation GG-1 of this section (tons).
n = Total number of Waelz kilns or electrothermic furnaces at facility used for the zinc production.
(c) If GHG emissions from a Waelz kiln or electrothermic furnace are vented through the same stack as any combustion unit or process equipment that reports CO2 emissions using a CEMS that complies with the Tier 4 Calculation Methodology in subpart C of this part (General Stationary Fuel Combustion Sources), then the calculation methodology in paragraph (b) of this section shall not be used to calculate process emissions. The owner or operator shall report under this subpart the combined stack emissions according to the Tier 4 Calculation Methodology in §98.33(a)(4) and all associated requirements for Tier 4 in subpart C of this part.
[74 FR 56374, Oct. 30, 2009, as amended at 75 FR 66470, Oct. 28, 2010]
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