burnNGGivenFG Flow712Nm3/hrsreekanthtm's CALCthorium90's CALCCH497.49mol%Calculation of combustion air required for the given NG and given excess air.Calculation of combustion air required for the given NG and given excess air.C2H61.5mol%Basis: 100 kmol of given natural gas (NG), normal conditions (MCR=100%)Basis: 100 kmol of given natural gas (NG), normal conditions (MCR=100%)N21mol%componentquantitystoichiometric O2 (*)stoichiometric O2Resulting gases after stoichiom burningcomponentquantitystoichiometric O2 (*)stoichiometric O2Resulting gases after stoichiom burningCO2-0.01mol%kmolkmol O2 / kmol compkmolCO2, kmolH2O (g), kmolN2, kmolkmolkmol O2 / kmol compkmolCO2, kmolH2O (g), kmolN2, kmolSince basis was 100kmol, need to convert to 31.76kmol, thereforeN20.317658606200000.3176586062N20.317658606200000.3176586062CH430.9685375212mol%CO2000000CO2000000C2H60.4764879093mol%CH430.9685375212261.937075042430.968537521261.93707504240CH430.9685375212261.937075042430.968537521261.93707504240N20.3176586062mol%C2H60.47648790933.51.66770768270.95297581871.4294637280C2H60.47648790933.51.66770768270.95297581871.4294637280CO2-0.0031765861mol%C3H8050000C3H8050000Notice CO2 is negative, could be direct import of results from an analyzer needing abit of calibration, Therefore, some manipulation is needed. ie: put to 0C4H1006.50000C4H1006.50000CO (assumed)
Kostas Kalaitzoglou: Just to close balance and have total = 100 kmol.You have to do something similar, not necessarily with CO.00.50000CO (assumed)
Kostas Kalaitzoglou: Just to close balance and have total = 100 kmol.You have to do something similar, not necessarily with CO.00.50000Total31.76663.631.963.40.32Total31.76663.631.963.40.32Putting these in, one gets 303kmol "Stoichiometric air for complete burning"Air for 100% burningkmol303Stoichiometric air for complete burningAir for 100% burningkmol303Stoichiometric air for complete burningTaking MW of air to be28.9Air MWMass of air is8753.2296226423kg airExcess air%20specific value to be advised by VendorExcess air%20specific value to be advised by VendorFrom picture below,0.26kg water/kg dry airO2 in with airkmol76O2 in with airkmol762275.839701887kg waterN2 in with airkmol287N2 in with airkmol287Convert to kmol18.0153Water MWHumidity inkmol0
Kostas Kalaitzoglou: You can estimate it for more precise resultsHumidity inkmol126.5
Kostas Kalaitzoglou: You can estimate it for more precise results

126.328kmol waterTotal air inkmol363Total air inkmol490Total air inNm38147Total air inNm310982Resulting flue gasesResulting flue gasesO2 kmol12.72O2 kmol12.72CO2kmol31.9CO2kmol31.9H2O (g)kmol63.4H2O (g)kmol189.9N2 kmol287N2 kmol287Totalkmol395Totalkmol522TotalNm3/h8864TotalNm3/h11699