# Hibbing Taconite Company **Table 1: Facility-wide Potential to Emit Calculations for NOx and SO2** 

SV EU EU_Desc Tput_Hr Tput_Hr_Note Tput_Ann Tput_Ann_Note Units Pollutant Unc lbs/hr Unc tons/yr PTE lbs/hr PTE tons/yr SV 021-024 EU 020 Pellet Indurating Furnace Line 1 140 [101] 1,226,400 [102] MM Btu NOx 4.7651 [103] 667 [105] 2,922 [106] [107] 667 [108] 2,922 [109] SV 021-024 EU 020 Pellet Indurating Furnace Line 1 140 [101] 1,226,400 [102] MM Btu SO2 2 [104] 280 [105] 1,226 [106] [107] 280 [108] 1,226 [109] SV 025-028 EU 021 Pellet Indurating Furnace Line 2 140 [101] 1,226,400 [102] MM Btu NOx 4.7651 [103] 667 [105] 2,922 [106] [107] 667 [108] 2,922 [109] SV 025-028 EU 021 Pellet Indurating Furnace Line 2 140 [101] 1,226,400 [102] MM Btu SO2 2 [104] 280 [105] 1,226 [106] [107] 280 [108] 1,226 [109] SV 029-032 EU 022 Pellet Indurating Furnace Line 3 140 [101] 1,226,400 [102] MM Btu NOx 4.7651 [103] 667 [105] 2,922 [106] [107] 667 [108] 2,922 [109] SV 029-032 EU 022 Pellet Indurating Furnace Line 3 140 [101] 1,226,400 [102] MM Btu SO2 2 [104] 280 [105] 1,226 [106] [107] 280 [108] 1,226 [109]

Total NOx: 2,001.3 8,765.9 2,001.3 8,765.9 Total SO2: 840.0 3,679.2 840.0 3,679.2

**Notes:** [101]Maxim

um hourly throughput = Design capacity of emission unit: Pellet Indurating Furnace Line 1 140 MM Btu/hr Pellet Indurating Furnace Line 2 140 MM Btu/hr Pellet Indurating Furnace Line 3 140 MM Btu/hr [102]Maxim

um annual throughput = Maximum hourly throughput x 8,760 hrs/yr. [103]NOx em

issions depend on the fuel being fired but not on the pellet production rate. Worst-case emission factor is selected:

AP-42, "Natural Gas Com bustion" (7/98), Table 1.4-1 for "Large Wall-fired Boilers (> 100 MM Btu/hr)": 280 lbs/MM cf 0.2745lbs/MM Btu, converted from fuel units (lbs/MM cf) using the heat content in [110] AP-42, "Fuel Oil Combustion" (5/10), Table 1.3-1 for "Boilers > 100 MM Btu/hr), No. 6 oil fired, norm al firing": 47 lbs/M gallons 0.3133 lbs/MM Btu, converted from fuel units (lbs/M gallons) using the heat content in [110] AP-42, "Fuel Oil Combustion" (5/10), Table 1.3-1 for "Boilers > 100 MM Btu/hr), No. 5 oil fired, norm al firing": 47 lbs/M gallons 0.3133 lbs/MM Btu, converted from fuel units (lbs/M gallons) using the heat content in [110] AP-42, "Fuel Oil Combustion" (5/10), Table 1.3-1 for "Boilers > 100 MM Btu/hr), No. 4 oil fired, norm al firing": 47 lbs/M gallons 0.3133 lbs/MM Btu, converted from fuel units (lbs/M gallons) using the heat content in [110] AP-42, "Fuel Oil Combustion" (5/10), Table 1.3-1 for "Boilers > 100 MM Btu/hr), No. 2 oil fired, norm al firing": 24 lbs/M gallons 0.1714lbs/MM Btu, converted from fuel units (lbs/M gallons) using the heat content in [110] Stack Test results, averaged over four stacks: EU 020Furnace 1 3.5671 lbs/MM Btu Test [13] 5/1/2007 3.1007lbs/MM Btu Test [23] 6/22/2010 EU 021 Furnace 2 3.6950lbs/MM Btu Test [13] 5/2/2007 4.7651 lbs/MM Btu Test [23] 6/10/2010 EU 022Furnace 3 2.9107lbs/MM Btu Test [13] 5/8/2007 3.1001 lbs/MM Btu Test [23] 6/16/2010 [104] SO2 em

issions depend on the fuel being fired and the pellet production rate. Emission factor is based on existing permit limit: AP-42, "Natural Gas Com bustion" (7/98), Table 1.4-2": 0.6 lbs/MM cf 0.0006lbs/MM Btu, converted from fuel units (lbs/MM cf) using the heat content in [110] AP-42, "Fuel Oil Combustion" (5/10), Table 1.3-1 for "Boilers > 100 MM Btu/hr), No. 6 oil fired, norm al firing": 15.7 lbs/M gallons 0.1047lbs/MM Btu, converted from fuel units (lbs/M gallons) using the heat content in [110] AP-42, "Fuel Oil Combustion" (5/10), Table 1.3-1 for "Boilers > 100 MM Btu/hr), No. 5 oil fired, norm al firing": 15.7 lbs/M gallons 0.1047lbs/MM Btu, converted from fuel units (lbs/M gallons) using the heat content in [110] AP-42, "Fuel Oil Combustion" (5/10), Table 1.3-1 for "Boilers > 100 MM Btu/hr), No. 4 oil fired, norm al firing": 15 lbs/M gallons 0.1000lbs/MM Btu, converted from fuel units (lbs/M gallons) using the heat content in [110] AP-42, "Fuel Oil Combustion" (5/10), Table 1.3-1 for "Boilers > 100 MM Btu/hr), No. 2 oil fired, norm al firing": 14.2 lbs/M gallons 0.1014lbs/MM Btu, converted from fuel units (lbs/M gallons) using the heat content in [110] Limit in permit 13700061-004, page A-11 (which includes 0.75 lbs/MM Btu for the contribution of SO2 from the pellets): 2lbs/MM Btu Stack Test results, averaged over four stacks: EU 020Furnace 1 0.2397lbs/MM Btu Test [7] 6/14/2005 0.5558lbs/MM Btu Test [23] 6/22/2010 EU 021 Furnace 2 0.3626lbs/MM Btu Test [5] 6/23-24/2004 0.6204lbs/MM Btu Test [23] 6/10/2010 EU 022Furnace 3 0.3650lbs/MM Btu Test [7] 6/22-23/05 0.7590lbs/MM Btu Test [23] 6/16/2010 where sulfur content of fuel oil is based on a limit in permit 13700061-004, page A-11: 0.1 % sulfur [105]Max. Uncontrolled Emissions (lbs/hr) = Max. Hourly Throughput (units/hr) x Uncontrolled Emission Factor (lbs/unit). [106]Max. Uncontrolled Emissions (tons/yr) = Max. Annual Throughput (units/yr) x Uncontrolled Emission Factor (lbs/unit) / 2,000 (lbs/ton). [107]APCD used in this process is not effective in controlling this pollutant. [108]Max. Controlled Emissions (lbs/hr) = Max. Uncontrolled Emissions (lbs/hr) x ((100-Control Eff.)/100). [109]Max. Controlled Emissions (tons/yr) = Max. Uncontrolled Emissions (tons/yr) x ((100-Control Eff.)/100). [110]Fuel heat contents: No. 6 (residual), No.5 and No. 4 fuel oil 150 MM Btu/M gallons #6 fuel oil (from AP-42, May 2010, Table 1.3-2 footnote d) No. 2 (distillate) fuel oil 140 MM Btu/M gallons #6 fuel oil (from AP-42, May 2010, Table 1.3-2 footnote d)

Natural gas 1,020 MM Btu/MM cf (from AP-42, July 1998, Table 1.4-1 footnote a) **Emission Factor Max. Controlled Emissions** 

(lbs/hr) (tons/yr) (lbs/Unit) (%) **Control Efficiency**

(lbs/hr) (tons/yr) **Max. Uncontrolled Emissions Stack ID**  **Emission Unit Throughput**  **Pollutant**

(Units/hr) (Units/yr) **ID Description**  **Maximum Units** 

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