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Chapter 12. Air Pollution Control

Chapter 12. Air Pollution Control. CIEG 331 Introduction to Environmental Engineering. Air Pollution Control. Gaseous Particulates. Gaseous Pollutants. Absorption Adsorption Combustion. Flue Gas Desulfurization (FGD). Non-regenerative: non-recovery and reuse of chemical reagents

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Chapter 12. Air Pollution Control

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  1. Chapter 12. Air Pollution Control CIEG 331 Introduction to Environmental Engineering

  2. Air Pollution Control • Gaseous • Particulates

  3. Gaseous Pollutants • Absorption • Adsorption • Combustion

  4. Flue Gas Desulfurization (FGD) • Non-regenerative: non-recovery and reuse of chemical reagents • Regenerative: recovery and reuse of chemical reagents

  5. Non-regenerative systems • Chemicals: lime, limestone, caustic soda, soda ash, ammonia • SO2 + CaCO3 ---> CaSO3 + CO2 • SO2 + Ca(OH)2 ---> CaSO3 + H2O • CaSO3 + 1/2 O2 ---> CaSO4 • Types • Wet • Dry

  6. Wet Type • Venturi • Static packed • Moving bed • Tray tower • Spray towers

  7. Vertical Venturi Scrubber

  8. Packed Bed Scrubber

  9. Dry Scrubber System http://www.fkinc.com/dirctspraydry.htm#top

  10. Preventive minimizing operating temperature fuel switching low excess air flue gas recirculation lean combustion staged combustion low Nox burners secondary combustion water/steam injection Post combustion selective catalytic reduction selective non-catalytic reduction non-selective catalytic reduction Control Technologies for Nitrogen Oxides

  11. Particulate Pollutants • Cyclone • Filter • Liquid scrubbing • Electrostatic precipitation (ESP)

  12. B De H L1 L3 D2 L2 Dd Cyclone d0.5 = cut diameter at 50% removal m = dynamic viscosity of gas, Pa-s B = width, m H = height, m rp = particle density, kg/m3 Qg = gas flow rate, m3/s q = effective number of turns

  13. For standard Cyclone: B = 0.25 D2 = 0.13 m H = 0.5 D2 = 0.25 m L1 = L2 = 2 D2 = 1 m Ex. 6-9 Given: D2 = 0.5 m Qg = 4 m3/s T = 25 oC rp = 800 kg/m3 Q = What is the removal efficiency for particles with ave diameter of 10 mm? h = 0.95 @ d =10 mm

  14. Cyclone Installation at Wood Working Plant http://www.fkinc.com/cyclones.htm

  15. Air Filtration

  16. Case A: Pore blocking Case B: Pore plugging Case C1: Pore narrowing Case C2: Pore narrowing w/lost pore Case D: Pore bridging

  17. Air Filtration • Impaction • Diffusion • Straining (Interception) • Electrostatics

  18. Air Filter • High removal efficiency for < 5 mm particles

  19. Scrubber • Venturi

  20. ESP

  21. ESP http://www.powerspancorp.com/news/precipitator.shtml

  22. http://www.ppcbio.com/ppcdespwhatis.htm

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