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Chapter 12. Air Pollution Control

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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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