The stoichiometric or theoretical air-fuel ratio for the combustion of C5H12
The composition of the combustion products when C5H12 is burned with 150 percent theoretical air
A hydrocarbon fuel of unknown composition is burned with air. The volumetric analysis on a dry basis of the resulting flue gas is 9.27% CO2, 2.31% CO, 4.86% O2, and 83.56% N2. Determine:
The composition of the fuel on mass basis
The air-fuel ratio on mass basis
The percent excess or deficit air
The molar composition of a particular natural gas is as follows: CH4 = 67.6%, C2H6 = 31.3%, and N2 = 1.1%. Calculate:
The theoretical air-fuel ratio on molar basis and on mass basis.
Estimate the molar composition of the combustion products if the fuel is burned with 150 percent theoretical air.
Assume complete combustion of the fuel.
Butane is burned with dry air at an air-fuel ratio of 20. Calculate:
The volume percentage of CO2, in the products
The dew point temperature of the products
Butane is burned with dry air, and volumetric analysis of the products on a dry basis (the water vapor is not measured) gives 11.0% CO2, 1.0% CO, 3.5% O2, and 84.5% N2. Determine the percent theoretical air.
Volumetric analysis of the products of combustion of an unknown hydrocarbon, measured on a dry basis, gives 10.4%CO2, 1.2%CO, 2.8%O2, and 85.6%N2. Determine the composition of the hydrocarbon and the percent theoretical air.
A gaseous fuel has the molar analysis of 30% CH4, 20% CO, and 30% N2. Determine the theoretical air-fuel ratio on mass basis for complete combustion of the fuel gas.
A sample of dry anthracite has the following composition by mass:
C 90%, H 3%, O 2.5%, N 1%, S 0.5%, ash 3%
The stoichiometric air/fuel ratio
The air/fuel and the dry and wet analysis of the products of combustion by mass and dry volume, when 20% excess air is supplied
The gravimetric analysis of a sample of coal is given as 80% C, 12% H, and 8% ash. Calculate the stoichiometric air/fuel (A/F) ratio and the analysis of the products by volume.
In an engine test, the dry product analysis was CO2 15.5%, O2 2.3%, and the remainder N2. Assuming that the fuel burned was a pure hydrocarbon, calculate the ratio of carbon to hydrogen in the fuel, the A/F ratio used, and the mixture strength.
Octane vapor is burned with air. The molar analysis of the products of combustion on a dry basis is 8.45% CO2, 1.48% CO, 7.81% O2, and 82.8% N2. Determine the air-fuel ratio on mass basis, used for combustion.
The ultimate analysis of a sample petrol was 85% C and 15% H. The analysis of the dry products showed 13.5% CO2, some CO, and the remainder N2. Calculate:
The actual air/fuel ratio
The mass of H2O vapor carried by the exhaust gas per kilogram of total exhaust gas
The temperature to which the gas must be cooled before combustion of the H2O vapor begins if the pressure in the exhaust pipe is 1.013 bar