. Q3. An electric utility uses a Welsh coal that has an ultimate analysis (by mass) of 84.36 percent C, 1.89 percent H2, 4.40 percent O2, 0.63 percent N2, 0.89 percent S, and 7.83 percent ash (non-combustibles) as fuel for its boilers. The utility is changing from the Welsh coal to a coal from overseas which has an ultimate analysis (by mass) of 67.40 percent C, 5.31 percent H2, 15.11 percent O2, 1.44 percent N2, 2.36 percent S, and 8.38 percent ash (non-combustibles) as fuel for its boilers. With the Welsh coal, the boilers used 20 percent excess air. Calculate the heat released, the smokestack dew- point temperature, and carbon dioxide production for 3 different amounts of excess air (20 percent, 100 percent, and 150 percent). Note: Assume S will react with oxygen and form SO2. Assume CO and CO2 are both exist in the smokestack and are in equilibrium. (TOTAL 25 MARKS)