Lecture_12_for_class - Combustion Reactions: A special case...

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Combustion Reactions: A special case of reactive systems Combustion: rapid reaction of fuel with oxygen or air. Major source of energy: • 60-70% of electricity in US • ~100 % of energy of vehicles • Heating for manufacturing Combustion can be complete or incomplete C’s → CO 2 CO H’s → H 2 O S’s → SO 2 [N] → [NO x ] Composition of AIR: 78.03 mol% N 2 20.99 mol% O 2 0.94 mol% Ar 0.03 mol% CO 2 0.01 mol% H 2 , He, Ne, Kr, Xe We lump inerts with N 2 to give: 79 mol% N 2
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2 or air: amount required stoichiometrically for complete combustion of all fuel (regardless of whether or not combustion is complete in actual process). Excess O 2 or air = actual – theoretical theoretical Depends on theoretical air and air in feed, not on O 2 consumed Composition on wet or dry basis: whenever H 2 O is present in the combustion gas (or gas mixture), compositions (mole fractions) can be given including H 2 O (wet) or excluding H 2 O (dry) in the calculation.
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This note was uploaded on 11/12/2009 for the course CHEM 2190 at Cornell University (Engineering School).

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Lecture_12_for_class - Combustion Reactions: A special case...

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