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

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Unformatted text preview: 9/13/11 Aerosol & Particulate Research 9/13/11 Aerosol & Particulate Research 11 Incineration Combustion Kinetics Parameters Incinerator Design Mass balance Energy balance Required fuel Dimension Catalytic Incinerator Hazardous Waste Incinerator Reading: Chap 11 http://www.pacificincinerators.com/i 9/13/11 Aerosol & Particulate Research 9/13/11 Aerosol & Particulate Research 22 Effects of Temperature and Time 9/13/11 Aerosol & Particulate Research 9/13/11 Aerosol & Particulate Research 33 Combustion Kinetics (Global models) n A A kC dt dC- = CA : concentration of pollutant A k : kinetic rate constant n : reaction order If pollutant concentration is much less than O2 concentration, n can be assumed to be 1. ( 29 kt C C A A- = exp Arrhenius Equation for rate constant ( 29 RT E A k act / exp- = Eact : activation energy (cal/mol) R : gas constant (1.987 cal/gmole K) 9/13/11 Aerosol & Particulate Research 9/13/11 Aerosol & Particulate Research 44 Determination of A and Eact 9/13/11 Aerosol & Particulate Research 9/13/11 Aerosol & Particulate Research 55 ' ' 2 R P y S Z A O = Z collision rate factor S : Steric factor ( ineffective collision ) yO2 : mole fraction of O2 in the afterburner P : pressure (atm) R : gas constant (0.08205 l-atm/mol oK) MW S 16 = 1 . 46 00966 . +- = MW E act Q: How long does it take to incinerate 99% toluene (MW = 92) at 1000 K (O2 mole fraction = 0.15)? (Kcal/mol) 9/13/11 Aerosol & Particulate Research 9/13/11 Aerosol & Particulate Research 66 Thermal Incinerator Design Isothermal Plug Flow Reactor Knowns? Unknowns? mwaste gas mburner air mfuel T1 mexhaus t T2 9/13/11 Aerosol & Particulate Research 9/13/11 Aerosol & Particulate Research 77 Mass Balance: air exhaust air burner fuel gas waste m m m m Out In = + + = Energy Balance ( 29 ( 29 T T C m T T C Q H Q H m q p p g g h- =- = = = qh : heat rate required Q : gas volume flow rate g : gas density H : enthalpy (Table B.7) Cp : specific heat T0 : reference temperature (25 oC or 60 oF) ....
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Incineration - 9/13/11 Aerosol & Particulate...

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