SP21-31 - ME300 Spring 2011 - Special Problems SP21 A...

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ME300 Spring 2011 - Special Problems SP21 A gaseous fuel with a volumetric analysis of 60 percent CH 4 , 30 percent H 2 , and 10 percent N 2 is burned to completion with 130 percent theoretical air. Determine (a) the air-fuel ratio and (b) the fraction of water vapor that would condense if the product gases were cooled to 20 o C at 1 atm. Answers: (a) 18.6 kg air /kg fuel , (b) 88 percent. SP22 Work on problem 13.66 from the textbook but plot the x ranging from 200 to 500%. SP23 Methane gas (CH 4 ) at 25 o C, 1 atm enters a steam generator operating at steady state. The methane burns completely with 50% excess air entering at 25 o C, 1 atm. Product of combustion exit at 177 o C, 1 atm. The heat needed for generating steam is 2,000 kW. Neglect kinetic and potential energy effects. a) Determine the moles of each product per mole of fuel added for complete combustion b) Determine the required molar flow rate of the methane, in kmol/s c) Determine the required volumetric flow rate of the methane, in m 3 /s Answers: (b) 0.002735 kmol/s, (c) 0.0669 m 3 /s SP24
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SP21-31 - ME300 Spring 2011 - Special Problems SP21 A...

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