lecture_2011_09_08 - Michigan State University Mechanical...

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Harold Schock Michigan State University Michigan State University Mechanical Engineering Mechanical Engineering FALL 2011 - ME 444 FALL 2011 - ME 444 Chemical Reactions Chemical Reactions Harold Schock Harold Schock
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Harold Schock Fuels for the Fuels for the Internal Combustion Engine Internal Combustion Engine Coal Liquid hydrocarbons Gaseous hydrocarbons Alcohols Liquid and gaseous HC fuels are composed of many different hydrocarbons
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Harold Schock A Few Definitions for Fuels A Few Definitions for Fuels H H H H H H I I I I I I H – C – C – C – C – H H – C – C = C – C – H I I I I I I I I H H H H H H H H (a) (b) Molecular structure: a – saturated chain b – unsaturated chain
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Harold Schock Fuel Definitions (cont.) H H Hydrocarbons can also have a \ / “ring structure.” Cyclo-alkanes C are saturated and have the / \ formula C n H 2n . They are also H – C – C – H called Cyclopropane naphthenes / \ Two molecules with the same H H number of carbon and hydrogen atoms, but with a different (Saturated) structure are called isomers.
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Harold Schock Characteristics of Some Characteristics of Some Hydrocarbon Families Hydrocarbon Families No Ring C n H 2n-6 Aromatics Benzene Yes Ring C n H 2n Naphthene No Chain C n H 2n-2 Diolefin No Chain C n H 2n Olefin Yes Chain C n H 2n+2 Alkanes Saturated Structure Formula Family Adapted from VanWylen & Sonntag
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Harold Schock Fuel Composition and Combustion Fuel Composition and Combustion Fuels are a mixture of hydrocarbons During combustion H-C bonds are broken and new bonds are formed with oxygen Chemical energy is converted to thermal energy during this process and also a formation of (CO 2 + H 2 O) Size and geometry of the molecule control
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Hydrocarbon Hydrocarbon Fuels from Crude Fuels from Crude Oil are Derived from Oil are Derived from “Distillation and “Distillation and
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This note was uploaded on 01/29/2012 for the course ME 444 taught by Professor Staff during the Fall '08 term at Michigan State University.

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lecture_2011_09_08 - Michigan State University Mechanical...

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