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Methods to Reduce Sulfur Dioxide Emissions From Coal-Fueled Utilities

Methods to Reduce Sulfur Dioxide Emissions From Coal-Fueled Utilities. Cynthia Schmidt Mechanical Engineering Department University of Texas. Three classes of methods exist for reducing emissions of sulfur dioxide. pre-combustion methods. combustion methods. post-combustion methods.

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Methods to Reduce Sulfur Dioxide Emissions From Coal-Fueled Utilities

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  1. Methods to ReduceSulfur Dioxide EmissionsFrom Coal-Fueled Utilities Cynthia Schmidt Mechanical Engineering Department University of Texas

  2. Three classes of methods exist forreducing emissions of sulfur dioxide pre-combustion methods combustion methods post-combustion methods

  3. Coal switching and coal cleaningare two precombustion methods Coal Cleaning High Sulfur Mine Low Sulfur Mine Coal Switching

  4. Utilities can reduce SO2 emissions by switching to low sulfur coal High Sulfur Mine Low Sulfur Mine • 70% removal of SO2 • no capital costs • increased coal costs • increased transportation costs

  5. Coal cleaning removes sulfur from the coal after it is mined Coal Cleaning • 20–70% removal of SO2 • no capital costs • increased coal cost • decreased transportation costs • decreased operating costs

  6. Choose a format that's professional • 90% removal capability • low capital cost—able to use in existing equipment • high operating cost • ability to use different grades of coal cleaned exhaust separator grid air inlet The most effective combustion methodis an atmospheric fluidized bed

  7. Adsorption Absorption gas outlet stationary sorbent bed mist eliminator inlet for combustion gases gas outlet spray water inlet for combustion gases drain Absorption and adsorption are twopost-combustion processes

  8. Absorption removes SO2 by washingthe exhaust gas after combustion Absorption • 90–95% removal of SO2 • high capital costs • increased operating costs • large amounts of water needed • disposal problem for sludge gas outlet mist eliminator spray water inlet for combustion gases drain

  9. Adsorption removes sulfur dioxide with a stationary sorbent bed Adsorption stationary sorbent bed inlet for combustion gases gas outlet • 80% removal of SO2 • high capital costs • no need for water • increased operating costs

  10. By using these methods, coal utilitiescan greatly reduce SO2 emissions coal cleaning coal switching fluidized bed absorption adsorption 40% 40% 80% 90% 95% 80% 25 50 75 Percentage Reduction of SO2

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