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# NOx Emission Factors - PowerPoint PPT Presentation

NOx Emission Factors. Robert Fowler ME 449: Sustainable Air Quality April 2001. Table of Contents. Objective of work Major contributors for NOx emissions Emission factor equations Data sources Summary Recommendations. Objective. Show emission factor calculations Method

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### NOx Emission Factors

Robert Fowler

ME 449: Sustainable Air Quality

April 2001

• Objective of work

• Major contributors for NOx emissions

• Emission factor equations

• Data sources

• Summary

• Recommendations

### Objective

Show emission factor calculations

Method

Web search and EPA manual foe emission factors AP-42

• Transportation - gas and diesel vehicles

• Fuel combustion - power plants

• Industrial Processes - waste disposal/petroleum refinery

Driving factors: Emission factor and vehicle miles traveled

Equation for emission factor

EF = (BER*OMTCF+OMTTAM)*SALCHF*TF

• BER - basic emission rate

• OMTCF - operating mode/temperature correction factor

• OMTTAM - Tampering offset

• SALCHF - Speed correction factor

• TF - Travel fraction

To get the emission inventory:

EI = EF * VMT

### Fuel combustion emission equation

Driving factors: emission factor & quantity of fuel consumed

Emission factor: Mass of pollutant/mass of fuel (or output)

Boilers - lb NOx/ton fuel

ICE’s - lb NOx/hp-hr power output and lb NOx/MMBtu fuel input

Gas turbines - lb NOx/MMBtu fuel

Stationary diesels - lb NOx/hp-hr power output and lb NOx/MMBtu fuel input

Stationary dual fuel engines - lb NOx/hp-hr power output and lb NOx/MMBtu fuel input

Driving factors: Emission factor and mass of fuel burned

Emission factor: mass pollutant/mass (or volume) fuel

• Solid waste disposal - kg NOx/Mg refuse or lb NOx/ton refuse

• Sewage sludge - kg NOx/Mg refuse or lb NOx/ton sludge

• Medical - kg NOx/Mg refuse or lb NOx/ton refuse

• Open burning - kg NOx/Mg refuse or lb NOx/ton refuse

• Auto Body - kg NOx/Mg refuse or lb NOx/ton refuse

• Evaporation losses - g/drum or lb/drum

• Petroleum refineries - kg NOx/103 L fresh feed; lb NOx/1000 bbl (barrel) fresh feed; kg NOx/1000 m3 gas burned; lb NOx/1000 ft3 gas burned; kg NOx/103 L refinery feed; lb NOx/1000 bbl refinery feed

• Transportation data - EPA AP-42 Vol II Appendix G

http://www.epa.gov/otaq/ap42.htm

• Fuel combustion and industrial processes - EPA AP-42 Vol I Chapter 1-5, 11

http://www.epa.gov/ttn/chief/ap42/ch01/

http://www.epa.gov/ttn/chief/ap42/ch02/

http://www.epa.gov/ttn/chief/ap42/ch03/

http://www.epa.gov/ttn/chief/ap42/ch04/

http://www.epa.gov/ttn/chief/ap42/ch05/

http://www.epa.gov/ttn/chief/ap42/ch11/

• The major contributors of NOx emissions are….

• Emission inventory is determined by …..

• Data came from…..

Conclusion

• Still don’t know where they get the numbers for the emission factors (not in AP42??)

• EPA website very useful(for…)

• The uncontrolled emission factors can be reduced by better controls within the system (what is the system?)

• The controlled emission factors can be reduced by better scrubbers and filters at the exhaust