Reference Case - Fuel Input standard for pollutant X
Input-based standard 0.0200lbs/MMBtu fuel Reference boiler efficiency 75.0% Equivalent Output-based standard 0.0267lbs/MMBtu steam

CHP Example - Boiler with back pressure steam turbine
Boiler steam outout (high pressure) 160.77MMBtu/hr CHP generation 3,000kW CHP generation (conversion to Btu) 10.24MMBtu/hr Steam to Process (low pressure) 150.00MMBtu/hr Boiler efficiency 75.0% Boiler fuel input 214.37MMBtu/hr(Boiler steam output divided by boiler efficiency) Annual operating hours 8,000 Annual boiler fuel use 1,714,931MMBtu/yr Total emissions of X - input 17.15Tons/yr(based on total fuel used @ 0.02 lb/MMBtu)

A. What are the output-based emissions for various output measurements?

Output Measurement Total Site Emissions,

Tons/yr Boiler steam output (high pressure) 17.15 Steam to process + CHP output @3412 Btu/kWh 17.15 Steam to process + CHP output @10,000 HR 17.15 Steam to process + CHP output @5,000 HR 17.15

Output Measurement Total Site Emissions*,

Tons/yr Boiler steam output (high pressure) 17.15 Steam to process + CHP output @3412 Btu/kWh 17.09 Steam to process + CHP output @10,000 HR 19.20 Steam to process + CHP output @5,000 HR 17.60
* CHP output offsets emissions at central stationAllowable Fuel emissions rate based on 0.0267 output limit, lb/MMBtu input 0.0200 Output-Based Emissions Rate, lbs/MMBtu output

0.0199 0.0224 0.0205 B. What is the equivalent input-based limit if output-based standard is applied to various ouput measurements? 0.0267 0.0268 0.0238 0.0260Reference Case - Fuel Input standard for pollutant X
Input-based standard 0.0200lbs/MMBtu fuel Reference boiler efficiency 75.0% Equivalent Output-based standard 0.0267lbs/MMBtu steam
Power only boiler with CHP retrofit - Industrial Site (generally lower pressure boiler, lower power cycle efficiency)
Fuel input, MMBtu/hr 200.0 200.0 200.0 200.0 200.0 200.0 Boiler Efficiency, % 75% 75% 75% 75% 75% 75% Boiler Steam Output, MMBtu/hr 150.0 150.0 150.0 150.0 150.0 150.0 Boiler Steam Temperature, F 950 950 950 950 950 950 Boiler Steam Pressure, Psi 1500 1500 1500 1500 1500 1500 Boiler Steam flow, lbs/hr 103,000 103,000 103,000 103,000 103,000 103,000 Steam Turbine CondensingExtraction Extraction Extraction ExtractionBack Pressure Power Generation, kW 11,932 11,625 11,318 11,012 8,865 5,615 Power Generation, MMBtu/hr 40.71 39.66 38.62 37.57 30.25 19.16 Steam to process, lbs/hr 0 5,000 10,000 15,000 50,000 103,000 Steam to process, MMBtu/hr 0.00 6.30 12.60 18.90 63.00 129.78 Total Efficiency, % 20.4% 23.0% 25.6% 28.2% 46.6% 74.5% Operating Hours 8,000 8,000 8,000 8,000 8,000 8,000 Total Emissions, Tons/yr 16.0 16.0 16.0 16.0 16.0 16.0
Output-based emissions rate, lbs/MMBtu, Boiler steam out 0.0267 0.0267 0.0267 0.0267 0.0267 0.0267 Output-based emissions rate, lbs/MMBtu, Process steam and CHP @3412 Btu/kWh 0.0983 0.0870 0.0781 0.0708 0.0429 0.0269 Output-based emissions rate, lbs/MMBtu, Process steam and CHP @5000 0.0670 0.0621 0.0578 0.0541 0.0373 0.0253 Output-based emissions rate, lbs/MMBtu, Process steam and CHP @7500 0.0447 0.0428 0.0410 0.0394 0.0309 0.0233 Output-based emissions rate, lbs/MMBtu, Process steam and CHP @10000 0.0335 0.0326 0.0318 0.0310 0.0264 0.0215 Output-based emissions rate, lbs/MMBtu, Process steam and CHP @12500 0.0267 0.0263 0.0259 0.0255 0.0230 0.0200

Power only boiler with CHP retrofit - Small Scale Utility Boiler (higher pressure boiler with higher power cycle efficiency, although not at the 33 to 35% level of large subcritical steam cycles)
Fuel input, MMBtu/hr 200.0 200.0 200.0 200.0 200.0 200.0 Boiler Efficiency, % 75% 75% 75% 75% 75% 75% Boiler Steam Output, MMBtu/hr 150.0 150.0 150.0 150.0 150.0 150.0 Boiler Steam Temperature, F 950 950 950 950 950 950 Boiler Steam Pressure, Psi 2400 2400 2400 2400 2400 2400 Boiler Steam flow, lbs/hr 105,000 105,000 105,000 105,000 105,000 105,000 Steam Turbine CondensingExtractionExtractionExtractionExtractionBack Pressure Power Generation, kW 15,168 14,678 14,187 13,697 10,262 6,010 Power Generation, MMBtu/hr 51.75 50.08 48.41 46.73 35.01 20.51 Steam to process, lbs/hr 0 5,000 10,000 15,000 50,000 105,000 Steam to process, MMBtu/hr 0.00 6.30 12.60 18.90 63.00 128.63 Total Efficiency, % 25.9% 28.2% 30.5% 32.8% 49.0% 74.6% Operating Hours 8,000 8,000 8,000 8,000 8,000 8,000 Total Emissions, Tons/yr 16.0 16.0 16.0 16.0 16.0 16.0
Output-based emissions rate, lbs/MMBtu, Process steam and CHP @3412 Btu/kWh 0.0267 0.0267 0.0267 0.0267 0.0267 0.0267 Output-based emissions rate, lbs/MMBtu, Process steam and CHP @3412 0.0773 0.0709 0.0656 0.0609 0.0408 0.0268 Output-based emissions rate, lbs/MMBtu, Process steam and CHP @5000 0.0527 0.0502 0.0479 0.0458 0.0350 0.0252 Output-based emissions rate, lbs/MMBtu, Process steam and CHP @7500 0.0352 0.0344 0.0336 0.0329 0.0286 0.0230 Output-based emissions rate, lbs/MMBtu, Process steam and CHP @10000 0.0264 0.0261 0.0259 0.0257 0.0242 0.0212 Output-based emissions rate, lbs/MMBtu, Process steam and CHP @12500 0.0211 0.0211 0.0211 0.0210 0.0209 0.0196CHP - Boiler with back-pressure steam turbine

Fuel Input 214.37MMBtu/hr High Pressure Steam 600 Psi 125,000 lbs/hr 160.77MMBtu/hr

No CHP - Boiler direct to process

Fuel Input 200.00MMBtu/hr 

## Boiler 75% eff

Boiler 75% effLow Pressure Steam to Process 150 Psi 125,000 lbs/hr 150.00MMBtu/hr

Power 3,000kW 10.24MMBtu

Losses 0.54MMBtu/hr

Low Pressure Steam to Process 150 Psi 125,000 lbs/hr 150.00MMBtu/hr 

## Steam Turbine