Page 11 - WM E-Learning Handbook

P. 11

Slide Topic Content Notes

Emissions Properties of Natural  Lower in:
Gas Vehicles (NGVs)  Carbon monoxide (CO)
 Hydrocarbons (HC)
 Nitrogen oxides (NOX)
 Greenhouse gas

emissions (CO2)

 Zero
 Particulates
 Evaporative emissions

Combustion Properties of  Gaseous fuel
Natural Gas  No need for atomization
 Displaces some intake air
 Higher temperatures
 No sludge or carbon

deposits

How Natural Gas Compares to  Source and Physical State
Gasoline and Diesel  Vapor Density
 Ignition and Flammability
 Weight and Energy

Comparison
 Octane and Cetane Rating
 Transportation and Storage

What Is Octane?  Rating for the ability to resist
detonation

 The higher the number, the
higher the temperature
required to ignite the fuel

What Is Cetane?  Rating of the speed at which
fuel begins to combust

 The higher the number, the
faster the ignition begins

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