Consider a 32% efficient 600 MW power plant burning 10,000 Btu/lb coal containing 60% carbon and 2% sulfur by mass ta) 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? > (in m/s) (d) How much cooling water would be required 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 15C? fe) What impact would this have on the water temperature of a 100 m/s stream at 15C that serves both as the source and the sink for the cooling water? Report the new water temperature in the river. (f) Estimate the annual carbon emissions from the plant. Report the emissions as: million short tons C/yr (where 1 short ton = 2000 lbs), (i) (ii) million metric tons C/yr (where 1 metric ton = 1000 kg), and (iii) g C/kJ energy output (g) 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?