A certain sample of natural gas analyses 74% methane, 12% ethane, 5.5% propane, 4.7% N2 and 3.8% CO2. A sample of the natural gas is completely burned in a burner using 45% excess air at 30OC, 748 mmHg and 80% relative humidity to produce stack gases at 250OC and 760 mmHg. Calculate a. GCV and NCV of the sample gaseous fuel in MJ/kg b. Orsat Analysis of the stack gas  c. m3 stack gas/m3 air

Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
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A certain sample of natural gas analyses 74% methane, 12% ethane, 5.5% propane, 4.7% N2 and 3.8% CO2. A sample of the natural gas is completely burned in a burner using 45% excess air at 30OC, 748 mmHg and 80% relative humidity to produce stack gases at 250OC
and 760 mmHg. Calculate
a. GCV and NCV of the sample gaseous fuel in MJ/kg
b. Orsat Analysis of the stack gas 
c. m3 stack gas/m3 air 
d. Dew point of the stack gas in degree C

 

ΔHv of water (25OC) = 40.70 KJ/mol
MWair = 29 kg/kmol 

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