Consider a 28% efficient 500 MW power plant burning 10,000 Btu/lb coal containing 60% carbon and 2% sulfur by mass (a) What is the rate of sulfur production at the power plant in lbs S/hr? (b) Suppose you install a caustic scrubber with SO removal efficiency of 80%, how many lbs/hr of SO are released? (c) Given that the SO emissions are limited to 0.6 lbs SO per million Btu of heat input; does the plant meet the EPA standards? If not, what would you suggest as the new efficiency for the caustic scrubber? (d) How much cooling water would be required (in m/s) to carry away the waste heat at the power plant if only 10% of waste heat escaped with stack gases, and we allowed the water temperature of the cooling water to increase in temperature by 12C? (e) Compare the carbon emissions from the coal-fired power plant with those estimated as 0.0206 g C/kJ for petroleum in Problem 2.7, and as 0.0134 g C/kJ for methane in Example 2.3. How would you rank the three fossil fuels from cleanest to dirtiest based on carbon emissions?