CombustionThermochemistryLect1ME525SP2011

CombustionThermochemistryLect1ME525SP2011 - ME 525:...

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ME 525: Combustion Lecture 1: Introduction to Combustion Thermochemistry rof Robert P Lucht Prof. Robert P. Lucht Room 87, Mechanical Engineering Building School of Mechanical Engineering Purdue University West Lafayette, Indiana Lucht@purdue.edu 765-494-5623 (Phone) January 11, 2011 School of Mechanical Engineering, Purdue University
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Lecture Topics troduction to reaction oichiometry emphasis on Introduction to reaction stoichiometry, emphasis on combustion of hydrocarbon fuels. troduction to the concept of enthalpy of formation Introduction to the concept of enthalpy of formation. Energy balance for reacting flows. Calculation of the temperature of adiabatic combustion. Introduction to chemical equilibrium for reacting systems. Use of the concept of Gibbs free energy as a criterion for equilibrium. School of Mechanical Engineering, Purdue University
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Reaction Stoichiometry: Hydrocarbon Combustion with Air The products of the stoichiometric combustion of a hydrocarbon fuel are CO and H O. For reaction 2 2 thermochemistry calculations, it is usually assumed that the diatomic nitrogen (N 2 ) does not react.  22 3.76 xy s t o i c h CH a O N  2 3.76 2 stoich y x CO H O a N or stoichiometric combustion of For stoichiometric combustion of hydrocarbon fuels: y School of Mechanical Engineering, Purdue University a x stoich 4
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Reaction Stoichiometry: Hydrocarbon Combustion with Air For stoichiometric combustion, the amount of O 2 that reacts ith the hydrocarbon fuel just the right amount to with the hydrocarbon fuel C x H y is just the right amount to convert all the C in the fuel to CO 2 and all the H in the fuel to The equivalence ratio is defined with respect to this H 2 O . The equivalence ratio is defined with respect to this stoichiometric condition: A    / / stoich stoich stoich FA AF a A F a  1, 1   fuel - rich fuel - lean School of Mechanical Engineering, Purdue University
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Reaction Stoichiometry: Hydrocarbon Combustion with Air Examples of stoichiometric combustion = 1: 3 76 2 7 52 H O N CO H O N ethane :   42 2 2 2 2 23 .76 7.52 3 76 2 2 11 28 CH H O N CO HO N  methane : thylene :   24 2 2 2 2 2 33 .76 11.28 3 . 7 6 CH H O N ethylene : ropane :   38 2 2 22 2 53 3 4 18.8 CO H O N propane :  81 8 2 2 2 12.5 3.76 89 4 7 O N CO H O N octane : School of Mechanical Engineering, Purdue University
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Hydrocarbon Combustion with Air: Lean Mixtures Lean Combustion: a > a stoich : For lean combustion, major reaction products are CO 2 and H 2 O. Excess O 2 is present in the air and it does not all  222 2 2 2 3.76 3.76 xy CH a O N bCO cHO dO aN  react, so the products of lean combustion will contain O 2 . : :2 Cxb Hy c Atom Balances: : 22 2 2 2 376 O a b c d da b c a a  :2 3.76 2 3.76 Na  38 2 2 2 83 . 7 6 3 O N CO Example: School of Mechanical Engineering, Purdue University 2 43 3 0 .08 HO O N
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Hydrocarbon Combustion with Air: Rich Mixtures Rich Combustion: a < a stoich :
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CombustionThermochemistryLect1ME525SP2011 - ME 525:...

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