H2O2ChemMechLect5ME525SP2011

H2O2ChemMechLect5ME525SP2011 - ME 525: Combustion Lecture...

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ME 525: Combustion Lecture 5: Hydrogen/Oxygen Chemical echanism Mechanism 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 25, 2011 School of Mechanical Engineering, Purdue University
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Lecture Topics The hydrogen/oxygen reaction mechanism. Partial equilibrium in the hydrogen/oxygen reaction mechanism. •H 2 /O 2 explosion limits. Combustion of carbon monoxide. School of Mechanical Engineering, Purdue University
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H 2 -O 2 Reaction Mechanism Simplest reaction mechanism of practical importance in combustion ey sub echanism for the combustion of CO and Key sub-mechanism for the combustion of CO and hydrocarbons (1) Chain initiation step at very high temperature: 2 1 (1) k HM HHM    (2) Chain initiation step at lower mperatures: 22 2 ) k HO O H temperatures: School of Mechanical Engineering, Purdue University 2 (2) HO
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H 2 -O 2 Reaction Mechanism hain reaction steps: Chain reaction steps:  2 3 23 k HO O O H      2 4 24 5 k OH H k O H HH O   22 2 5 6 15 26 k O O H  3 opens up the chain- ranching R3 opens up the chain branching sequence School of Mechanical Engineering, Purdue University
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H 2 -O 2 Reaction Mechanism hain termination steps ery exothermic reactions Chain termination steps ( very exothermic reactions ) :  2 7 7 k HHM HM    2 8 8 k OOM O M      9 10 9 10 k HOM O k H OH M H O M 2 School of Mechanical Engineering, Purdue University
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H 2 -O 2 Reaction Mechanism Hydroperoxyl / hydrogen peroxide reactions: yp y yg p  22 11 11 k HO M H O M   2 12 3 12 k HO H OH OH    2 13 14 13 14 k HO H H O O k HO O O OH    2 2 2 15 15 k HO HO H O O 2 2 16 16 k HO H H O H School of Mechanical Engineering, Purdue University
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H 2 -O 2 Reaction Mechanism
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H2O2ChemMechLect5ME525SP2011 - ME 525: Combustion Lecture...

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