Emissions Calculations - Stack

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1 Emissions Calculations - Composition of Gas Exiting (lb/hr) Fuel Type: PRB - 1 PRB /10 Blend /10 Blend - 2 Case: Worst Case (Ref. #1) Typical Annual (Ref. #2) Worst Case (Ref. #3) Typical Annual (Ref. #4) Oxygen 353, , , ,530 Nitrogen 4,800,280 4,566,406 4,901,547 4,663,011 Carbon Dioxide 1,358,469 1,292,086 1,319,105 1,254,738 Sulfur Dioxide Moisture 837, , , ,206 Total Flue Gas Flow Rate (lb/hr) 7,349,741 6,895,403 7,438,153 6,986,847 Moisture Added by wet FGD 261, , , ,802 Composition of Gas Exiting (moles/hr) Oxygen 11,040 10,500 12,040 11,450 Nitrogen 171, , , ,460 Carbon Dioxide 30,870 29,360 29,970 28,510 Sulfur Dioxide Moisture 46,490 38,880 46,180 38,980 Total Flue Gas Flow Rate (moles/hr) 259, , , ,406 Exit Conditions Fuel Type: PRB - 1 PRB /10 Blend /10 Blend - 2 Case: Worst Case (Ref. #1) Typical Annual (Ref. #2) Worst Case (Ref. #3) Typical Annual (Ref. #4) Fuel Burn Rate, MBtu/hr 6,326 6,017 6,322 6,014 Fuel Higher Heating Value, Btu/lb 8,300 8,300 8,729 8,729 Fuel Burn Rate, lb/hr 762, , , ,929 Wet Molecular Weight, lb/mole Flue Gas Density, lb/cuft Total Gas Flow Rate, acfm 1,940,460 1,793,722 1,965,967 1,821,558 Total Gas Flow Rate leaving A/H, acfm 2,392,341 2,202,160 2,408,433 2,231,899 Temperature, F Pressure, in w.g Exit Velocity, ft/sec Exit Area (ft 2 ) Diameter (feet) Nitrogen Oxide NO X Uncontrolled Emission Rate, lb/mbtu NO X Uncontrolled Emission Rate, ppmvw (actual O 2) NO X Controlled Emission Rate, lb/mbtu NO X Controlled Emissions, lb/hr NO X Controlled Emissions, ppmvw (actual O 2) Sulfur Dioxide Uncontrolled SO 2 Emissions, lb/hr 5,025 4,780 19,535 18,582 Scrubber Removal Efficiency, % 92.4% 92.4% 98.1% 98.1% Controlled SO 2 Emissions, lb/hr Controlled SO 2 Emissions, moles/hr Controlled SO 2 Emissions, ppmw Controlled SO 2 Emissons, lb/mbtu Carbon Monoxide (CO) CO Emission Rate, lb/mbtu CO Emission Rate, lb/hr

2 Emissions Calculations - Fuel Type: PRB - 1 PRB /10 Blend /10 Blend - 2 Case: Worst Case (Ref. #1) Typical Annual (Ref. #2) Worst Case (Ref. #3) Typical Annual (Ref. #4) Sulfur Trioxide (SO 3) SO 2 to SO 3 Conversion Rate (Boiler and SCR Total), % Uncontrolled SO 3 Emissions, lb/hr Uncontrolled SO 3 Emissions, moles/hr Uncontrolled SO 3 Emissions, ppmvw (actual O2) Uncontrolled SO 3 Emissions as H 2SO 4, lb/hr Controlled SO 3 Emissions, lb/hr Controlled SO 3 Emissions, lb/mbtu Controlled SO 3 Emissions, as H 2SO 4 lb/hr Controlled SO 3 Emissions, as H 2SO 4 lb/mbtu Particulate (PM+PM 10) Ash Content in Fuel, percent 4.93% 4.93% 8.30% 8.30% Unburned Carbon, lb/hr Uncontrolled Particulate Emissions, lb/hr 30,439 28,952 48,699 46,323 Uncontrolled Particulate Emission Rate, lb/mbtu Uncontrolled Particulate, Emissions, gr/acf Controlled Particulate Emissions (Filterable), lb/hr Controlled Particulate Emission Rate (Filterable), lb/mbtu Controlled Particulate, Emissions (Filterable), gr/acf Controlled Particulate Emissions (Filterable + Condensible), lb/hr Controlled Particulate Emission Rate (Filterable + Condensible), lb/mmbtu Controlled Particulate, Emissions (Filterable + Condensible), gr/acf Volatile Organic Compounds (VOC) VOC Emission Rate, lb/mbtu VOC Emission Rate, lb/hr Mercury (Hg) Hg Emission Rate, lb/mw-hr 6.6E E E E-05 Ammonia Slip (NH 3) Ammonia Slip, ppmvd (at 3% O 2) Ammonia Slip, lb/hr Fluorides as HF HF Emission Rate, lb/mbtu HF Emission Rate, lb/hr Consumables Water (gpm) Limestone (lb/hr) 7,786 7,407 32,218 30,646 Sorbent Injection (lb/hr) -- (Ref. #5) ,084 1,032 Powdered Activated Carbon -- PAC sorbent injection (lb/hr) Ammonia (Anhydrous) (lb/hr) Ammonia 19% NH 3) (lb/hr) 1,976 1,880 1,976 1,879 Waste Products Total Fly Ash Removed (lb/hr) 30,363 28,879 48,623 46,250 Sellable Fly Ash (lb/hr) 28,917 27,504 46,264 44,006 Non-sellable Fly Ash (lb/hr) 1,953 1,844 2,868 2,718 Bottom Ash (lb/hr) 7,515 7,148 12,023 11,436 Total Byproducts [gypsum] from FGD -- dry basis (lb/hr) 12,589 11,995 52,472 49,920 Assumptions: 1. Fly Ash / Bottom Ash Split is 80/ Unit MW at Design Load is 649 MW Net References: 1. Design PRB Fuel Case (Rawhide) -- Worst Case Conditions -- Heaters Out of Service, Export Process Steam, High Ambient Temperature Day 2. Design PRB Fuel Case (Rawhide) -- Typical Annual Conditions -- Normal Operation, Mean Ambient Temperature Day 3. Maximum Fuel Sulfur Case (Jacobs Ranch PRB 90% and Greater Belleville U.G. Illinois Basin 10%) -- Worst Case Conditions -- Heaters Out of Service, Export Process Steam, High Ambient Temperature Day 4. Maximum Fuel Sulfur Case (Jacobs Ranch PRB 90% and Greater Belleville U.G. Illinois Basin 10%) -- Typical Annual Conditions -- Normal Operation, Mean Ambient Temperature Day 5. SOLVAY Chemicals, SOLVAir Select Application Guide (Sorbent Injection Rate) Notes: 1. Exit Area and Diameter was set by the PRB/Illinois/Biomass (85/10/5) Blend case due to the fact that it had the greatest stack flow which drives the stack diameter.

3 Emissions Calculations - 17-Jan-07 Composition of Gas Exiting (lb/hr) Fuel Type: PRB - 1 PRB /10 Blend /10 Blend - 1 Case: 75% Load (Ref. #1) 50% Load (Ref. #2) 75% Load (Ref. #3) 50% Load (Ref. #4) Oxygen 292, , , ,697 Nitrogen 3,690,683 2,661,283 3,768,765 2,716,231 Carbon Dioxide 1,018, , , ,536 Sulfur Dioxide Moisture 557, , , ,927 Total Flue Gas Flow Rate (lb/hr) 5,559,440 3,970,133 5,627,909 4,019,581 Moisture Added by wet FGD 187, , , ,154 Composition of Gas Exiting (moles/hr) Oxygen 9,130 7,980 9,900 8,520 Nitrogen 131,750 95, ,530 96,960 Carbon Dioxide 23,150 15,430 22,480 14,990 Sulfur Dioxide Moisture 30,940 20,760 30,680 20,590 Total Flue Gas Flow Rate (moles/hr) 194, , , ,063 Exit Conditions Fuel Type: PRB - 1 PRB /10 Blend /10 Blend - 1 Case: 75% Load (Ref. #1) 50% Load (Ref. #2) 75% Load (Ref. #3) 50% Load (Ref. #4) Fuel Burn Rate, MBtu/hr 4,744 3,163 4,742 3,161 Fuel Higher Heating Value, Btu/lb 8,300 8,300 8,729 8,729 Fuel Burn Rate, lb/hr 571, , , ,126 Wet Molecular Weight, lb/mole Flue Gas Density, lb/cuft Total Gas Flow Rate, acfm 1,445,407 1,027,703 1,464,540 1,041,314 Total Gas Flow Rate leaving A/H, acfm 1,738,831 1,228,459 1,788,251 1,264,003 Temperature, F Pressure, in w.g Exit Velocity, ft/sec Exit Area (ft 2 ) Diameter (feet) Nitrogen Oxide NO X Uncontrolled Emission Rate, lb/mbtu NO X Uncontrolled Emission Rate, ppmvw (actual O 2) NO X Controlled Emission Rate, lb/mbtu NO X Controlled Emissions, lb/hr NO X Controlled Emissions, ppmvw (actual O 2) Sulfur Dioxide Uncontrolled SO 2 Emissions, lb/hr 3,769 2,513 14,653 9,767 Scrubber Removal Efficiency, % 92.4% 92.4% 98.1% 98.1% Controlled SO 2 Emissions, lb/hr Controlled SO 2 Emissions, moles/hr Controlled SO 2 Emissions, ppmw Controlled SO 2 Emissons, lb/mbtu Carbon Monoxide (CO) CO Emission Rate, lb/mbtu CO Emission Rate, lb/hr

4 Emissions Calculations - 17-Jan-07 Fuel Type: PRB - 1 PRB /10 Blend /10 Blend - 1 Case: 75% Load (Ref. #1) 50% Load (Ref. #2) 75% Load (Ref. #3) 50% Load (Ref. #4) Sulfur Trioxide (SO 3) SO 2 to SO 3 Conversion Rate (Boiler and SCR Total), % Uncontrolled SO 3 Emissions, lb/hr Uncontrolled SO 3 Emissions, moles/hr Uncontrolled SO 3 Emissions, ppmvw (actual O 2) Uncontrolled SO 3 Emissions as H 2SO 4, lb/hr Controlled SO 3 Emissions, lb/hr Controlled SO 3 Emissions, lb/mbtu Controlled SO 3 Emissions, as H 2SO 4 lb/hr Controlled SO 3 Emissions, as H 2SO 4 lb/mbtu Particulate (PM+PM 10) Ash Content in Fuel, percent 4.93% 4.93% 8.30% 8.30% Unburned Carbon, lb/hr Uncontrolled Particulate Emissions, lb/hr 22,827 15,220 36,527 24,349 Uncontrolled Particulate Emission Rate, lb/mmbtu Uncontrolled Particulate, Emissions, gr/acf Controlled Particulate Emissions (Filterable), lb/hr Controlled Particulate Emission Rate (Filterable), lb/mbtu Controlled Particulate, Emissions (Filterable), gr/acf Controlled Particulate Emissions (Filterable + Condensible), lb/hr Controlled Particulate Emission Rate (Filterable + Condensible), lb/mbtu Controlled Particulate, Emissions (Filterable + Condensible), gr/acf Volatile Organic Compounds (VOC) VOC Emission Rate, lb/mbtu VOC Emission Rate, lb/hr Mercury (Hg) Hg Emission Rate, lb/mw-hr 6.6E E E E-05 Ammonia Slip (NH 3) Ammonia Slip, ppmvd (at 3% O 2) Ammonia Slip, lb/hr Fluorides as HF HF Emission Rate, lb/mbtu HF Emission Rate, lb/hr Consumables Water (gpm) Limestone (lb/hr) 5,840 3,894 24,166 16,108 Sorbent Injection (lb/hr) -- (Ref. #5) Powdered Activated Carbon -- PAC sorbent injection (lb/hr) Ammonia 19% NH 3) (lb/hr) 1, , Waste Products Total Fly Ash Removed (lb/hr) 22,770 15,182 36,470 24,311 Sellable Fly Ash (lb/hr) 21,686 14,459 34,701 23,131 Non-sellable Fly Ash (lb/hr) 1, ,148 1,445 Bottom Ash (lb/hr) 5,636 3,757 9,018 6,011 Total Byproducts [gypsum] from FGD -- dry basis (lb/hr) 9,452 6,301 39,367 26,239 Assumptions: 1. Fly Ash / Bottom Ash Split is 80/ Unit MW at Design Load is 649 MW Net References: 1. Design PRB Fuel Case (Rawhide) -- 75% of Worst Case Heat Input -- Mean Ambient Temperature Day 2. Design PRB Fuel Case (Rawhide) -- 50% of Worst Case Heat Input -- Mean Ambient Temperature Day 3. Maximum Fuel Sulfur Case (Jacobs Ranch PRB 90% and Greater Belleville U.G. Illinois Basin 10%) -- 75% of Worst Case Heat Input -- Mean Ambient Temperature Day 4. Maximum Fuel Sulfur Case (Jacobs Ranch PRB 90% and Greater Belleville U.G. Illinois Basin 10%) -- 50% of Worst Case Heat Input -- Mean Ambient Temperature Day 5. SOLVAY Chemicals, SOLVAir Select Application Guide (Sorbent Injection Rate) Notes: 1. Exit Area and Diameter was set by the PRB/Illinois/Biomass (85/10/5) Blend case due to the fact that it had the greatest stack flow which drives the stack diameter.

5 Emissions Calculations - Composition of Gas Exiting (lb/hr) Fuel Type: 95 PRB - 5 BM 85/10 Blend - 5 BM Case: PRB/Biomass [95/5] (Ref. #1) PRB/Illinois/Biomass [85/10/5] (Ref. #2) Oxygen 376, ,300 Nitrogen 4,869,907 4,965,281 Chlorine 0 0 Carbon Dioxide 1,362,592 1,324,737 Sulfur Dioxide Moisture 845, ,361 Total Flue Gas Flow Rate (lb/hr) 7,454,851 7,537,059 Moisture Added by wet FGD 265, ,348 Composition of Gas Exiting (moles/hr) Oxygen 11,770 12,730 Nitrogen 173, ,250 Chlorine 0 0 Carbon Dioxide 30,960 30,100 Sulfur Dioxide 6 6 Moisture 46,930 46,590 Total Flue Gas Flow Rate (moles/hr) 263, ,676 Exit Conditions Fuel Type: 95 PRB - 5 BM 85/10 Blend - 5 BM Case: PRB/Biomass [95/5] (Ref. #1) PRB/Illinois/Biomass [85/10/5] (Ref. #2) Fuel Burn Rate, MBtu/hr 6,333 6,329 Fuel Higher Heating Value, Btu/lb 8,207 8,612 Fuel Burn Rate, lb/hr 771, ,934 Wet Molecular Weight, lb/mole Flue Gas Density, lb/cuft Total Gas Flow Rate, acfm 1,967,862 1,991,417 Total Gas Flow Rate leaving A/H, acfm 2,427,142 2,441,493 Temperature, F Pressure, in w.g. 0 0 Exit Velocity, ft/sec Exit Area (ft 2 ) Diameter (feet) Nitrogen Oxide NO X Uncontrolled Emission Rate, lb/mbtu NO X Uncontrolled Emission Rate, ppmvw (actual O 2) NO X Controlled Emission Rate, lb/mbtu NO X Controlled Emissions, lb/hr NO X Controlled Emissions, ppmvw (actual O 2) Sulfur Dioxide Uncontrolled SO 2 Emissions, lb/hr 4,873 18,781 Scrubber Removal Efficiency, % 92.2% 98.0% Controlled SO 2 Emissions, lb/hr Controlled SO 2 Emissions, moles/hr 6 6 Controlled SO 2 Emissions, ppmw Controlled SO 2 Emissons, lb/mbtu Carbon Monoxide (CO) CO Emission Rate, lb/mbtu CO Emission Rate, lb/hr

6 Emissions Calculations - Fuel Type: 95 PRB - 5 BM 85/10 Blend - 5 BM Case: PRB/Biomass [95/5] (Ref. #1) PRB/Illinois/Biomass [85/10/5] (Ref. #2) Sulfur Trioxide (SO 3) SO 2 to SO 3 Conversion Rate (Boiler and SCR Total), % Uncontrolled SO 3 Emissions, lb/hr Uncontrolled SO 3 Emissions, moles/hr Uncontrolled SO 3 Emissions, ppmvw (actual O 2) Uncontrolled SO 3 Emissions as H 2SO 4, lb/hr Controlled SO 3 Emissions, lb/hr Controlled SO 3 Emissions, lb/mbtu Controlled SO 3 Emissions, as H 2SO 4 lb/hr Controlled SO 3 Emissions, as H 2SO 4 lb/mbtu Particulate (PM+PM 10) Ash Content in Fuel, percent 4.93% 8.10% Unburned Carbon, lb/hr Uncontrolled Particulate Emissions, lb/hr 30,785 48,245 Uncontrolled Particulate Emission Rate, lb/mbtu Uncontrolled Particulate, Emissions, gr/acf Controlled Particulate Emissions (Filterable), lb/hr Controlled Particulate Emission Rate (Filterable), lb/mbtu Controlled Particulate, Emissions (Filterable), gr/acf Controlled Particulate Emissions (Filterable + Condensible), lb/hr Controlled Particulate Emission Rate (Filterable + Condensible), lb/mbtu Controlled Particulate, Emissions (Filterable + Condensible), gr/acf Volatile Organic Compounds (VOC) VOC Emission Rate, lb/mbtu VOC Emission Rate, lb/hr Mercury (Hg) Hg Emission Rate, lb/mw-hr 6.6E E-05 Ammonia Slip (NH 3) Ammonia Slip, ppmvd (at 3% O 2) Ammonia Slip, lb/hr Fluorides as HF HF Emission Rate, lb/mbtu HF Emission Rate, lb/hr Consumables Water (gpm) Limestone (lb/hr) 7,531 30,939 Sorbent Injection (lb/hr) -- (Ref. #3) 214 1,041 Powdered Activated Carbon -- PAC sorbent injection (lb/hr) Ammonia 19% NH 3) (lb/hr) 1,940 1,939 Waste Products Total Fly Ash Removed (lb/hr) 30,709 48,169 Sellable Fly Ash (lb/hr) 29,246 45,833 Non-sellable Fly Ash (lb/hr) 1,539 2,412 Bottom Ash (lb/hr) 7,601 11,903 Total Byproducts [gypsum] from FGD -- dry basis (lb/hr) 12,163 50,425 Assumptions: 1. Fly Ash / Bottom Ash Split is 80/ Unit MW at Design Load is 649 MW Net References: 1. PRB / Biomass Case (Rawhide PRB 95% and Biomass 5%) -- Worst Case Conditions -- Heaters Out of Service, Export Process Steam, High Ambient Temperature Day 2. PRB / Illinois / Biomass Case (Jacobs Ranch PRB 85%, Greater Belleville U.G. Illinois Basin 10%, and Biomass 5%) -- Worst Case Conditions -- Heaters Out of Service, Export Process Steam, High Ambient Temperature Day 3. SOLVAY Chemicals, SOLVAir Select Application Guide (Sorbent Injection Rate) Notes: 1. Exit Area and Diameter was set by the PRB/Illinois/Biomass (85/10/5) Blend case due to the fact that it had the greatest stack flow which drives the stack diameter.

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