السؤال الأاول A sample of coal has the following molal analysis C 67.35%, H2 26.26%, O2 2.28%, N20.57%, S 1.37%, H2O 2.17%. Write the complete combustion equation in stoichiometric air and calculate the coal ultimate analysis, mass percent.
السؤال الثاني 6. Hydrogen burns in pure oxygen in a chemically correct (stoichiometric) mixture. Write the combustion equation and calculate (a) the mass of products per unit mass of H2, and (b) the lower heating value of H2 if its higher heating value is 61,100 Btu/lbm.
7. A gaseous fuel that is derived from coal has the following ultimate volumetric analysis: H2 47.9%, methane (CH4) 33.9%, ethylene (C2H4) 5.2%, CO 6.1%, CO2 2.6%, N2 3.7%, and O2 0.6% It burns in 110 percent of theoretical air. Calculate (a) the volume flow rate of air required per unit volume flow rate of the gas when both are measured at the same pressure and temperature, and (b) the dew point of the combustion products, in degrees Fahrenheit, if the total pressure is 2 atm.
8. A southern California natural gas has the following ultimate analysis by mass: H2 23.3%. CH4 72% N2 0.76%, and O2 1.22%. The flue gases have the following volumetric analysis: H2O 15.583% SSWc. CO2 8.387%, O2 3.225%, N2 72.805%. Calculate (a) the percent