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.

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Presentation transcript:

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

Dr. F. IskanderaniChE 201 Spring 2003/2004

Dr. F. IskanderaniChE 201 Spring 2003/2004

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

Dr. F. IskanderaniChE 201 Spring 2003/2004

Dr. F. IskanderaniChE 201 Spring 2003/2004

Dr. F. IskanderaniChE 201 Spring 2003/2004

Dr. F. IskanderaniChE 201 Spring 2003/ % 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

Dr. F. IskanderaniChE 201 Spring 2003/2004 CO + 1/2 O 2  CO 2 S + O 2  SO 2 CH 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 ) (-5) % excess air

Dr. F. IskanderaniChE 201 Spring 2003/2004 = x 1 * 1 = x 3 * 2 In exit stream THUS x 1 = = 75 moles = moles CO 2 OUT x 3 = ( )/2 =60 moles = moles H 2 O OUT In stream F Atomic bal

Dr. F. IskanderaniChE 201 Spring 2003/ * 2 In exit stream In Feed stream In Air stream = x 1 * 2 + x 2 * 2 + x 3 * 1 + x 4 * 2

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

Dr. F. IskanderaniChE 201 Spring 2003/2004

Dr. F. IskanderaniChE 201 Spring 2003/2004

Dr. F. IskanderaniChE 201 Spring 2003/2004

Dr. F. IskanderaniChE 201 Spring 2003/2004

Dr. F. IskanderaniChE 201 Spring 2003/2004 C 3 H O 2  3 CO H 2 O ( the complete combustion rxn ) C 3 H O 2  3 CO + 4 H 2 O ( the partial/incomplete combustion rxn)

Dr. F. IskanderaniChE 201 Spring 2003/2004 C 3 H O 2  3 CO H 2 O ( the complete combustion rxn ) C 3 H O 2  3 CO + 4 H 2 O ( the partial/incomplete combustion rxn)

Dr. F. IskanderaniChE 201 Spring 2003/2004

Dr. F. IskanderaniChE 201 Spring 2003/2004

Dr. F. IskanderaniChE 201 Spring 2003/2004