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Unformatted text preview: Problem Set Combustion Chemistry Problem 1: Propane fuel is burned with a stoichiometric amount of air. Determine the mass fraction of each product. Also, calculate the mass of water in the products (lb m- H 2 O/lb m- C 3 H 8 ) and mass of air required (lb m- air/lb m- C 3 H 8 ) per unit of fuel mass burned. Solution: Once the species balances are satisfied, the complete reaction is The calculation of the mass per mole of fuel and mass fractions are presented in the table below No. of moles Mass/lbmole Total Mass mole fraction Reactants C 3 H 8 1 44.10 44.10 Air 23.8 28.97 689.5 Products CO 2 3 44.01 132.0 0.181 H 2 O 4 18.02 72.1 0.099 N 2 18.8 28.01 526.6 0.721 730.7 The mass of water produced is then and the mass of air required is . Center for Advanced Energy Systems Michael R. Muller, Director 640 Bartholomew Road, Piscataway NJ 08854 (732) 445-3655 FAX: (732) 445-0730 email@example.com http://caes.rutgers.edu Problem 2 : Ethyl alcohol is burned with 70% excess air. Calculate the mole fractions of the products formed and the reactants. Also, calculate the mass of water and oxygen contained in the products per unit mass of fuel burned (lb m- H 2 O/lb m- C 2 H 5 OH). Also, calculate the Air/Fuel ratio....
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- Fall '11