absorption - 9/13/11 Aerosol & Particulate...

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Unformatted text preview: 9/13/11 Aerosol & Particulate 9/13/11 Aerosol & Particulate 11 Absorption Definition Equipment Packing materials Design considerations: Mass balance High gas flow Mass flow Concentrated systems HTU and NTU Reading: Chap. 13 img.alibaba.com/photo/50678451/Ceramic_Metal_... 9/13/11 Aerosol & Particulate 9/13/11 Aerosol & Particulate 22 Definition Transfer of a gaseous component (absorbate) from the gas phase to a liquid (absorbent) phase through a gas-liquid interface . Q: What are the key parameters that affect the effectiveness? Q: How can we improve absorption efficiency? Mass transfer rate: gas phase controlled absorption liquid phase controlled absorption Q: Does it matter if its gas phase or liquid phase controlled? 9/13/11 Aerosol & Particulate 9/13/11 Aerosol & Particulate 33 Equipment Mist Eliminator Liquid Spray Packing Liquid outlet Dirty gas in Spray nozzle Clean gas out Countercurrent packed tower Spray tower Mycock et al., 1995 Redistributor Q: Limitations of a spray tower? Q: Why redistributor? Clean gas out Dirty gas in 9/13/11 Aerosol & Particulate 9/13/11 Aerosol & Particulate 44 Berl Saddle Intalox Saddle Raschig Ring Lessing Ring Pall Ring Tellerette Three-bed cross flow packed tower Liquid spray Dry Cell Packing Mycock et al., 1995 Q: Criteria for good packing materials? 9/13/11 Aerosol & Particulate 9/13/11 Aerosol & Particulate 55 Design considerations: What are known? What are we looking for? 9/13/11 Aerosol & Particulate 9/13/11 Aerosol & Particulate 66 Mass Balance In = Out Slope of Operating Line = Lm/Gm 1 2 2 1 m m m m L G L G + = + ( 29 ( 29 2 1 2 1 x x L y y G m m- =- Lm : molar liquid flow rate Gm : molar gas flow rate x : mole fraction of solute in pure liquid y : mole fraction of solute in inert gas (for a dilute system) Gas in Liquid out Gas out Liquid in 9/13/11 Aerosol & Particulate 9/13/11 Aerosol & Particulate 77 Clean water Dirty water Clean air Dirty air 9/13/11...
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absorption - 9/13/11 Aerosol & Particulate...

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