Lecture 21 - Overarching Questions: Driving and Emissions...

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1 CEE 260: Environmental and Sustainable Engineering Principles Lecture# 22 Auto Emissions, Fuel Consumption, and Mass/Energy Balances Rubin Ch 3. (Pg. 83-109). Sections 3.1-3.3 ICP #19 & #20: Fuel Consumption and Emissions during Constant Velocity and Acceleration. Overarching Questions: Driving and Emissions What is petroleum and the primary air pollutants formed during combustion? How does an internal combustion engine work? What is the optimal air to fuel ratio for an engine? What happens if these conditions are not met? What are some basic physical relationships between moving an automobile, energy consumption, fuel use, emissions per mile driven, and fuel consumption? What are the typical emissions quantities per mile driven for automobiles in the USA? Petroleum • Used in vast majority of transportation vehicles. • Feedstock for a variety of manufacturing chemicals. • Consumption = 65 million barrels per day (1 barrel = 42 gal.) • Formed biogenically from matter deposited in shallow seas and subsequently compressed by the overburden of deposited clays and shales. • When petroleum is burned as a fuel, the environmental pollutants of concern are hydrocarbons (HC), CO, CO 2 , NO x , and metals used as anti-knock agents. Petroleum • Major components are alkanes, aromatic hydroocarbons, organic nitrogen, and organic sulfur. • Petroleum is typically a mixture of up to 40 components, not all of which are substances that are economical to distill and separate. Gasoline
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Lecture 21 - Overarching Questions: Driving and Emissions...

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