L24 - ENCH 440 Lecture 24: Multiple Steady States in...

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ENCH 440 Lecture 24: Multiple Steady States in Non-Isothermal CSTRs ENCH 440 ENCH 440 Lecture 24: Multiple Steady States in Lecture 24: Multiple Steady States in Non Non - - Isothermal CSTRs Isothermal CSTRs Prof. Srinivasa R. Raghavan Department of Chemical Engineering University of Maryland Prof. Srinivasa Prof. Srinivasa R. Raghavan R. Raghavan Department of Chemical Engineering University of Maryland
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Lecture 24: Multiple Steady States in Non-Iso CSTRs Lecture 24: Multiple Steady States in Non-Iso CSTRs Graphical Approach to Finding CSTR Steady States Observation of Multiple Steady States
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The Energy Balance for a CSTR at Steady State The Energy Balance for a CSTR at Steady State R ( T ) G ( T ) = + ( ) c c UA T T Heat removed (by coolant in HX) + Heat removed (by flow) = Heat generated in an exothermic reaction F j 0 T 0 F j T T T c Heat exchanger with coolant at T c CSTR () 0 0 ˆ p c T T v ( ) A0 A R H FX ∆⋅ = κ (dimensionless heat transfer coefficient) = T ad (adiabatic temperature rise) ( ) c A 0 0 0 c ˆˆ R pp TT HF UA X cc −∆ +− = vv 0 ˆ p c v Make the equation dimensionless: Divide throughout by c A 0 ad ad 1 T X T −+ = ∆∆ Make the equation dimensionless: Divide throughout by T ad
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Graphical Approach to Finding CSTR Steady States Graphical Approach to Finding CSTR Steady States () c0 EB A ad ad 1 X TT κ
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This note was uploaded on 02/22/2012 for the course CHEM 423 taught by Professor Ra during the Spring '12 term at UMBC.

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L24 - ENCH 440 Lecture 24: Multiple Steady States in...

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