Life Cycle Associates - e15 Report

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Transcript of Life Cycle Associates - e15 Report

  • Change in Air Quality Impacts Associated with the Use of E15 Blends Instead of E10

    LCA.6091.94.2014 July 2014

    Prepared by:

    Stefan Unnasch Ashley Henderson

  • DISCLAIMER

    This report was prepared by Life Cycle Associates, LLC for Americans United for Change. Life

    Cycle Associates is not liable to any third parties who might make use of this work. No warranty

    or representation, express or implied, is made with respect to the accuracy, completeness, and/or

    usefulness of information contained in this report. Finally, no liability is assumed with respect to

    the use of, or for damages resulting from the use of, any information, method or process

    disclosed in this report. In accepting this report, the reader agrees to these terms.

    ACKNOWLEDGEMENT

    Life Cycle Associates, LLC performed this study under contract to Americans United for

    Change.

    Contact Information:

    Stefan Unnasch

    Life Cycle Associates, LLC

    1.650.461.9048

    unnasch@LifeCycleAssociates.com

    www.LifeCycleAssociates.com

    Recommended Citation: Unnasch, S. and A. Henderson, (2014). Air Quality Impacts Associated

    with the Use of E15 Blends Instead of E10. Life Cycle Associates Report LCA.6091.94.2014.

    Prepared for Growth Energy.

  • i |

    Contents

    Terms and Abbreviations ............................................................................................................... iii

    Executive Summary ........................................................................................................................ v 1. Introduction ............................................................................................................................. 1

    1.1 Energy Policies ................................................................................................................. 1 1.2 Study Objectives .............................................................................................................. 1 1.3 Ethanol Blend Research ................................................................................................... 2

    1.4 Approach .......................................................................................................................... 3 2. Background: Fueling with E15 ............................................................................................... 4

    2.1 What is E15? .................................................................................................................... 4

    2.2 Transport of E15............................................................................................................... 5 2.3 Storage and Dispensing of E15 ........................................................................................ 5 2.4 What vehicles can use E15? ............................................................................................. 6

    2.5 Drivability Testing ........................................................................................................... 7 3. Vehicle Air Emissions and Related Health Impacts ............................................................... 7

    3.1 How do exhaust emissions form? .................................................................................... 8

    3.1.1 Carbon Monoxide (CO) ............................................................................................ 8 3.1.2 Hydrocarbons (HC) ................................................................................................... 8

    3.1.3 Nitrogen Oxides (NOx) ............................................................................................. 8 3.1.4 Particulate Matter (PM) ............................................................................................ 8 3.1.5 Toxic Pollutants ........................................................................................................ 9

    3.1.6 VOCs and Ground Level Ozone ............................................................................... 9 3.1.7 Greenhouse Gases ..................................................................................................... 9

    3.2 Air Pollutant Human Health Impacts ............................................................................... 9 4. Changes in Emissions from Use of Ethanol Blended Fuels ................................................. 13

    4.1 Age of vehicle ................................................................................................................ 13 4.2 Fuel Composition ........................................................................................................... 14

    4.2.1 Oxygen Content ...................................................................................................... 16 4.2.2 Heat of Vaporization ............................................................................................... 17 4.2.3 Octane Number ....................................................................................................... 17 4.2.4 Vapor Pressure ........................................................................................................ 17

    4.3 Blending Technique ....................................................................................................... 18 4.4 Evaporative Emissions ................................................................................................... 19 4.5 Spills ............................................................................................................................... 19 4.6 Fuel Economy Impacts ................................................................................................... 20

    5. Findings of Existing Studies of Ethanol Blend Exhaust Emissions ..................................... 22 5.1 Carbon Monoxide Findings ............................................................................................ 22 5.2 Nitrogen Oxide Findings ................................................................................................ 22

    5.3 Carbonyl Findings .......................................................................................................... 22 5.4 Aromatic Compounds .................................................................................................... 23 5.5 Particulate Matter ........................................................................................................... 23

    6. Meta-analysis of Emission Test Data ................................................................................... 25 6.1 Normalization ................................................................................................................. 25

  • ii |

    6.2 Toxicity Air Contaminants ............................................................................................. 26

    6.2.1 Polycyclic Aromatic Hydrocarbons (PAHs) ........................................................... 26 6.2.2 Ozone Potential ....................................................................................................... 26

    6.3 Results ............................................................................................................................ 27

    6.3.1 NOx, CO, and NMHC ............................................................................................. 28 6.3.2 Weighted Toxic Emissions ..................................................................................... 31 6.3.3 Greenhouse Gas Emissions ..................................................................................... 32 6.3.4 Statistical and Uncertainty Analysis ....................................................................... 32

    7. Discussion and Conclusions: Net Effects of Changing from E10 to E15............................. 33

    Appendix A. Federal Emission Standards .................................................................................... 37 Appendix B. Normalized Emissions ............................................................................................. 41 Appendix C. Uncertainty Analysis ............................................................................................... 44 References ..................................................................................................................................... 47

    Tables

    Table 1.1 Summary of Prior Ethanol Blending & Emissions Research ......................................... 3

    Table 2.1. Description of Ethanol Properties .................................................................................. 5 Table 3.1. Air Emission Human Health Impacts .......................................................................... 11 Table 3.2. EPA IRIS and OEHHA Unit Risk Factors .................................................................. 12

    Table 4.1. Emission control technologies and design features ..................................................... 14 Table 4.2. Fuel Properties of Pure Ethanol vs. Pure Gasoline ...................................................... 15

    Table 4.3. Fuel Composition and Chemical Properties of Gasoline/Ethanol Blends ................... 16 Table 4.4. Calculation of Ethanol Blend Energy Content ............................................................ 21 Table 4.5. Energy Content of Ethanol Blends .............................................................................. 21

    Table 5.1. Summary of Individual Emission Study Results ......................................................... 24

    Table 4.7. Ozone potential for selected chemicals ...........................................................