Sunday, May 13, 2007

Effects of Fuel Ethanol Use on Fuel-Cycle Energy and Greenhouse Gas Emissions

Effects of Fuel Ethanol Use on Fuel-Cycle Energy and Greenhouse Gas Emissions

M. Wang, C. Saricks, and D. Santini

Center for Transportation Research, Energy Systems Division,
Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439

ANL/ESD-38
January 1999

Table of Contents

Notation..... v
Acknowledgments ..... vi
Summary ...... 1
1 Introduction ..... 7
2 Approach ..... 9
3 Key Assumptions ..... 11
3.1 Corn Farming ...... 11
3.2 Potential Land Use Changes Caused by Corn Ethanol Production ..... 11
3.3 Corn-Based Ethanol Production ..... 13
3.4 Biomass Farming and Transportation ...... 15
3.5 Production of Ethanol from Biomass ...... 15
3.6 Ethanol Vehicle Fuel Economy..... 17
4 Results ...... 18
5 References ...... 29

Figures
1 Corn/Biomass-to-Ethanol and Petroleum-to-Gasoline Fuel Cycle ..... 10
2 Net Energy Balance per Gallon of Ethanol ..... 19
3 Fuel-Cycle Petroleum Use of Gasoline and Ethanol Blends by Stage ..... 21
4 Fuel-Cycle Greenhouse Gas Emissions of Gasoline and Ethanol Blends by Stage ..... 22
5 Fuel-Cycle Greenhouse Gas Emissions of Gasoline and Ethanol Blends by Gas ..... 23
6 Fuel-Cycle Fossil Energy Use of Gasoline and Ethanol Blends by Stage ..... 24

Tables
1 Co-Product Yields in Ethanol Plants ..... 14
2 Co-Product Displacement Ratios ..... 14
3 Energy and Chemical Use for Biomass Farming and Transportation ..... 15
4 Feedstock Requirements, Energy Use, and Electricity Generation
Credits in Cellulosic Ethanol Plants ...... 16
5 Parametric Assumptions for Current Case, Near-Future Case, and Future Case ...... 18
6 Reductions in per-Vehicle-Mile GHG Emissions and Energy Use
by Ethanol Blends ..... 25
7 Sensitivity Analysis: Reductions in per-Vehicle-Mile GHG Emissions and
Energy Use by Ethanol Blends ..... 26
8 Reductions in GHG Emissions and Energy Use per Gallon of Ethanol
in Ethanol Blends ..... 27
9 Sensitivity Analysis: Reductions in GHG Emissions and Energy Use
per Gallon of Ethanol in Ethanol Blends ...... 28

Work sponsored by U.S. Department of Energy, Office of Technology Utilization, Office of Transportation Technologies

Source
[http://www.ethanol-gec.org/information/briefing/10.pdf]

No comments: