A coal-fired power plant burns bituminous coal with the composition given in the

Question

A coal-fired power plant burns bituminous coal with the composition given in the table below. Currently the power plant operates at a 33% efficiency and delivers 10,000 MWH (megawatt-hours) of electricity per day. At these conditions, the plant consumers 4.26 million kg of coal per day. A flue gas desulfurization (FGD) system is installed to remove SO2 by the reaction: SO2(g) + CaCO3(s) + 2H2O + 0.5O2(g) = CO2(g) + CaSO4'2H0O(s) What mass of the product CaSO4 2H2O(s) will be produced in one day? Assume a 100% yield of the above reaction (i.e., all SO2(g) can be converted to CaSO4-2H2O). Give your answers in kg/d. The flue gas desulfurization system requires energy, and its operation consumes 4% of the electricity produced by the power plant. By what percentage will the CO2 emissions of the power plant increase when the FGD system is installed? The power plant must still deliver 10,000 MWH (megawatt-hours) of electricity per day.

Explanation / Answer

a. 63900kg S*(1kmol S/32.065 kg S)*(1kmol SO2/1kmol S)*(1Kmol CaSO42H2O/1kmol SO2)*(156kgCaSO42H2O/1kmolCaSO42H2O)= 311 165, 9972 Kg/day CaSO4-2H2O

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