All terms used in this subpart have the same meaning given in the Clean Air Act and subpart A of this part.
Sec. Table F-1 to Subpart F of Part 98--Slope and Overvoltage
Coefficients for the Calculation of PFC Emissions From Aluminum
Production --------------------------------------------------------------------------------------------------------------------------------------------------------
CF4 slope coefficient CF4 overvoltage coefficient
Technology [(kg CF4/metric ton Al)/ [(kg CF4/metric ton Al)/ Weight fraction C2F6/CF4
(AE-Mins/cell-day)] (mV)] [(kg C2F6/kg CF4)]--------------------------------------------------------------------------------------------------------------------------------------------------------Center Worked Prebake (CWPB)....................................... 0.143 1.16 0.121Side Worked Prebake (SWPB)......................................... 0.272 3.65 0.252Vertical Stud S[oslash]derberg (VSS)............................... 0.092 NA 0.053Horizontal Stud S[oslash]derberg (HSS)............................. 0.099 NA 0.085-------------------------------------------------------------------------------------------------------------------------------------------------------- [75 FR 79156, Dec. 17, 2010]
Sec. Table F-2 to Subpart F of Part 98--Default Data Sources for
Parameters Used for CO2 Emissions ------------------------------------------------------------------------
Parameter Data source------------------------------------------------------------------------
CO2 Emissions from Prebake Cells (CWPB and SWPB)------------------------------------------------------------------------MP: metal production (metric tons Individual facility records.
Al).NAC: net annual prebaked anode Individual facility records.
consumption per metric ton Al
(metric tons C/metric tons Al).Sa: sulfur content in baked anode 2.0.
(percent weight).Asha: ash content in baked anode 0.4.
(percent weight).------------------------------------------------------------------------
CO2 Emissions From Pitch Volatiles Combustion (CWPB and SWPB)------------------------------------------------------------------------MP: metal production (metric tons Individual facility records.
Al).PC: annual paste consumption Individual facility records.
(metric ton/metric ton Al).CSM: annual emissions of HSS: 4.0.
cyclohexane soluble matter (kg/ VSS: 0.5.
metric ton Al).BC: binder content of paste Dry Paste: 24.
(percent weight). Wet Paste: 27.Sp: sulfur content of pitch 0.6.
(percent weight).Ashp: ash content of pitch 0.2.
(percent weight).Hp: hydrogen content of pitch 3.3.
(percent weight).Sc: sulfur content in calcined 1.9.
coke (percent weight).Ashc: ash content in calcined 0.2.
coke (percent weight).CD: carbon in skimmed dust from 0.01.
S[oslash]derberg cells (metric
ton C/metric ton Al).------------------------------------------------------------------------
CO2 Emissions from Pitch Volatiles Combustion (VSS and HSS)------------------------------------------------------------------------GA: initial weight of green Individual facility records.
anodes (metric tons).Hw: annual hydrogen content in 0.005 x GA.
green anodes (metric tons).BA: annual baked anode production Individual facility records.
(metric tons).WT: annual waste tar collected (a) 0.005 x GA.
(a) Riedhammer furnaces.......... (b) insignificant.(b) all other furnaces...........------------------------------------------------------------------------
CO2 Emissions From Bake Furnace Packing Materials (CWPB and SWPB)------------------------------------------------------------------------PCC: annual packing coke 0.015.
consumption (metric tons/metric
ton baked anode).BA: annual baked anode production Individual facility records.
(metric tons).Spc: sulfur content in packing 2.
coke (percent weight).Ashpc: ash content in packing 2.5.
coke (percent weight).------------------------------------------------------------------------ [74 FR 56374, Oct. 30, 2009, as amended at 75 FR 79156, Dec. 17, 2010]