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Compressed Natural Gas Specifications for Motor Vehicles

Compressed Natural Gas Specifications for Motor Vehicles . August 3, 2005. California Environmental Protection Agency. Air Resources Board. Agenda. Introductions Background Proposed concept Presentations by others on proposed concept Research needs

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Compressed Natural Gas Specifications for Motor Vehicles

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  1. Compressed Natural Gas Specifications for Motor Vehicles August 3, 2005 California Environmental Protection Agency Air Resources Board

  2. Agenda • Introductions • Background • Proposed concept • Presentations by others on proposed concept • Research needs • Presentations by others on research needs • Open discussion

  3. Background

  4. Compressed Natural Gas Motor Vehicle Fuel Regulation • Title 13, CCR, section 2292.5 adopted in 1992 • Compositional specifications • Based on technology available at that time • Provides engine manufacturers with a known fuel quality for designing engines • Addressed fuel related engine performance problems and excess emissions • More stringent than CPUC specifications for NG • Pipeline operators have imposed CNG specifications on the pipeline

  5. Current Motor VehicleCNG Specifications Methane (min.) 88 mol% Ethane (max.) 6 mol% C3+higher (max.) 3 mol% Inert Gases 1.5 - 4.5 mol% Other specs. to safeguard quality

  6. Compressed Natural Gas 88% of CA Current Supply Meets CNG MV Specifications

  7. California Associated Gas • Predominately in the Southern San Joaquin Valley and the South Central Coast • Exceed ethane, C3+ specifications • Higher energy content

  8. Potential for Imported LNG • Potential to displace a significant amount of CA natural gas supply • Potentially exceeds ethane, and C3+ specifications • Does not meet inert specifications • Higher energy content

  9. Modifications of CNG MV Specifications • CNG specifications could be updated • reflect vehicle technology advancements • provide flexibility • Need to balance cost with air quality and vehicle performance issues • Optional • Preserve performance and emission benefits

  10. Fuel Quality and Emissions • Test programs confirm that an increase in energy content will increase NOx emissions • Stationary sources • Mobile sources • Current information indicates that NOx emission increases may be significant • Additional tests need to be conducted to fully quantify the performance and emissions impacts

  11. Fuel Effects on Performance and Durability • Light duty engines are equipped with advanced feedback control systems and do not experience any significant effects • Heavy duty engines without advanced feedback control systems can experience significant performance and durability effects • Stationary applications can experience modified flame and combustion characteristics that can affect performance and durability

  12. Proposed Concept

  13. Proposed Concept Objectives • Provide compliance flexibility with CNG fuel regulation • Ensure protection of existing and new technology natural gas engines • No significant air quality degradation occurs

  14. Proposed Concept • Methane Number • 80 statewide • 73 regional • WOBBE Index • xxxx statewide • xxxx regional • Inerts 4% max. • C4+ 1.5% max. • Other specifications based on CPUC Rule 30 or Rule 21

  15. Presentations by Others on Proposed Concept

  16. Research Needs

  17. Presentations by Others on Research Needs

  18. Open Discussion

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