Lecture_11_notes

Lecture_11_notes - Chemical Engineering 633 Combustion...

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1 1 Chemical Engineering 633 Combustion Processes Kinetics 2 H 2 -O 2 System 2 Initiation H 2 + M à H + H + M H 2 + O 2 à HO 2 + H Chain Reactions H + O 2 à O + OH O + H 2 à H + OH H 2 + OH à H 2 O + H O + H 2 O à OH + OH Radicals break down O 2 , H 2 , or H 2 O Three of these are chain branching Three create OH, which reacts with H 2 à H 2 O Chain Reactions H + H + M à H 2 + M O + O + M à O 2 + M H + O + M à OH + M H + OH + M à H 2 O + M Three-body termination Two produce reactants Third creates radical but kills two Last produces product H 2 O First is active at only high temperatures Also have reactions for HO 2 and H 2 O 2
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2 H 2 -O 2 Mechanism (Yetter) 1) O2 + H <=> OH + O 2) H2 + O <=> OH + H 3) OH + H2 <=> H + H2O 4) 2 OH <=> H2O + O 5) H2 + M <=> 2 H + M 6) 2 O + M <=> O2 + M 7) H + O + M <=> OH + M 8) OH + H + M <=> H2O + M 9) O2 + H + M <=> HO2 + M 10) H + HO2 <=> O2 + H2 3 11) H + HO2 <=> 2 OH 12) O + HO2 <=> OH + O2 13) OH + HO2 <=> O2 + H2O 14) 2 HO2 <=> O2 + H2O2
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Lecture_11_notes - Chemical Engineering 633 Combustion...

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