ME300Lecture31

ME300Lecture31 - Lecture 31: Simultaneous Reactions Note:...

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31.1 Lecture 31: Simultaneous Reactions Note: In real applications, several reactions occur simultaneously! For example: » “Typical” combustion products of hydrocarbon combustion include: » Simultaneous Stoichiometric Equilibrium Reactions: 2 2 2 22 2 2 only important @ high T CO H O CO H CO 0.5O CO N O 2NO O 2O H 2H CO CO 2 H 2 O O 2 H 2 N 2 NO
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31.2 Continue Simultaneous Reactions Question: » How do you know which equilibrium reactions to consider? Answer: » Look at the K values of the various reactions that could be considered! » Experience! In general: » For all independent stoichiometric equilibrium reactions, the equilibrium criteria need to be satisfied! » For each reaction j: » Need to solve equations simultaneously for equilibrium amounts o T j G K exp RT i i i i react prod
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31.3 Example 31.1 Given: » Ethane burning with 130% theoretical air adiabatically at 1 atm: T prod = 2000 K Find: » The equilibrium compositions, if we consider the following products in equilibrium: CO 2 , H 2
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ME300Lecture31 - Lecture 31: Simultaneous Reactions Note:...

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