4.4Chpt4 -revisions to final notes.pdf

4.4Chpt4 -revisions to final notes.pdf - Note Forrxn o 3A...

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Note: For rxn 3A+2B 4C+D
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Example 4.7 3
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Combustion Produce energy from fuel. Complete combustion = full oxidation to CO 2 , H 2 O, SO 2 , etc Partial/incomplete combustion yields some CO. Air is common source of O 2 . Typically ~ 50% excess air **Air: 21% oxygen 4.76 mole air / mole O 2 “Stack Gas” or “Flue Gas” = product leaving combustion chamber Stack Gas or Flue Gas = product leaving combustion chamber.
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Theoretical Oxygen : moles or molar flow rate of O 2 needed for complete combustion of all fuel to CO 2 + H 2 O Theoretical Air : the amount of air needed to satisfy theoretical O 2 **Air: 21% oxygen 4.76 mole air / mole O 2 Excess Air : the amount of air that exceeds theoretical air Percent Excess Air = 100x(moles fed – moles theoretical)/(moles theoretical) Balances on Combustion Reactions: theoretical oxygen is calculated from stoichiometry based on complete oxidation (combustion) of all reactants– regardless of how much is really oxidation (combustion) of all reactants regardless of how much is really reacted, or whether it is actually completely oxidized.
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