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Dr. F. IskanderaniChE 201 Spring 2003/2004 EXAMPLE1 ( How to carry elemental or atomic balance on a stream) Fuel F is burned with air. Let F=25 Kg, and carry atomic balance on F in moles
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Dr. F. IskanderaniChE 201 Spring 2003/2004
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Dr. F. IskanderaniChE 201 Spring 2003/2004
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Dr. F. IskanderaniChE 201 Spring 2003/2004 EXAMPLE 2 ( How to carry elemental or atomic balance on a stream) Fuel F is burned with air. Let F=25 Kg, and carry atomic balances on F in MASS
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Dr. F. IskanderaniChE 201 Spring 2003/2004
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Dr. F. IskanderaniChE 201 Spring 2003/2004
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Dr. F. IskanderaniChE 201 Spring 2003/2004
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Dr. F. IskanderaniChE 201 Spring 2003/2004 40% excess air mol CO 2 x 1 SO 2 x 2 H 2 O x 3 O 2 x 4 N 2 x 5 P Let us change the problem as follows: Example3 (How to carry elemental or atomic balance on a stream) Fuel F is burned with 40% excwss air. Let F=25 Kgmoles, and carry atomic balance in moles Basis: F=100 kgmol
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Dr. F. IskanderaniChE 201 Spring 2003/2004 CO + 1/2 O 2 CO 2 S + O 2 SO 2 CH 4 + 2 O 2 CO 2 + 2H 2 O C 2 H 5 OH + 3 O 2 2CO 2 + 3H 2 O moles O 2 required Excess O 2 O 2 Entering CO S CH 4 C 2 H 5 OH (O 2 ) 40 30 15 10 20 30 8 12 28 42 (-5) 149 40% excess air
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Dr. F. IskanderaniChE 201 Spring 2003/2004 = x 1 * 1 = x 3 * 2 In exit stream THUS x 1 = 40+ 20 + 15 = 75 moles = moles CO 2 OUT x 3 = (60 + 60)/2 =60 moles = moles H 2 O OUT In stream F Atomic bal
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Dr. F. IskanderaniChE 201 Spring 2003/2004 +149 * 2 In exit stream In Feed stream In Air stream = x 1 * 2 + x 2 * 2 + x 3 * 1 + x 4 * 2
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Dr. F. IskanderaniChE 201 Spring 2003/2004 S Balance 0.3 * 100 kgmol S = x 2 mol SO 2 * 1 mol S Thus x 2 = 30 moles = moles SO 2 OUT Now we can find x 4 1 Mol SO 2
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Dr. F. IskanderaniChE 201 Spring 2003/2004
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Dr. F. IskanderaniChE 201 Spring 2003/2004
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Dr. F. IskanderaniChE 201 Spring 2003/2004
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Dr. F. IskanderaniChE 201 Spring 2003/2004
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Dr. F. IskanderaniChE 201 Spring 2003/2004 C 3 H 8 + 5 O 2 3 CO 2 + 4 H 2 O ( the complete combustion rxn ) C 3 H 8 + 3.5 O 2 3 CO + 4 H 2 O ( the partial/incomplete combustion rxn)
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Dr. F. IskanderaniChE 201 Spring 2003/2004 C 3 H 8 + 5 O 2 3 CO 2 + 4 H 2 O ( the complete combustion rxn ) C 3 H 8 + 3.5 O 2 3 CO + 4 H 2 O ( the partial/incomplete combustion rxn)
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Dr. F. IskanderaniChE 201 Spring 2003/2004
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Dr. F. IskanderaniChE 201 Spring 2003/2004
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Dr. F. IskanderaniChE 201 Spring 2003/2004
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