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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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Presentation Transcript
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NOx Emission Factors

Robert Fowler

ME 449: Sustainable Air Quality

April 2001


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Table of Contents

  • Objective of work

  • Major contributors for NOx emissions

  • Emission factor equations

  • Data sources

  • Summary

  • Recommendations


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Objective

Show emission factor calculations

Method

Web search and EPA manual foe emission factors AP-42


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Major Contributors to NOx

  • Transportation - gas and diesel vehicles

  • Fuel combustion - power plants

  • Industrial Processes - waste disposal/petroleum refinery


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Transportation emission equation

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


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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


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Industrial Processes emission equations

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


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Data Source

  • 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/


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Summary

  • 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…)


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Recommendations ( on

  • 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


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