Lecture_27_notes

Lecture_27_notes - 1 1 Chemical Engineering 633 Combustion...

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Unformatted text preview: 1 1 Chemical Engineering 633 Combustion Processes Review 2 Exam 2 Review • Classes 16-27 • Chapter 5 – NOx • Chapter 15 – Pollutant Emissions • Chapter 6 – Canonical Reactors – Batch, PFR, PSR • Chapter 7 – Governing Equations – Shvab-Zeldovich – Conserved Scalars • Chapter 8 – Premixed Flames – Premixed Analysis – Flame Speed – Extinction/Ignition 2 • Reading: Chps 5-8, 15 • Homework assignments 5-7 • Class discussions 2 Class 16—NO x Chemistry • Three Mechanisms – Thermal – Prompt (includes fuel) – N 2 O intermediate • Regions of activity • Zeldovich Mechanism (O2, N2 à NO) – Effects, limits: T, [O] eq . • Prompt: Fuel frag + N2 à HCN à NO • NO Control: combustion and post-combustion controls – NO vs T, NO vs φ , timescale – SCR, SNCR, explicity remove N 2 from feed (air separation, etc.) • Quantities – Fuel NO x = half of total – Limits: 15-40 ppmv 3 Class 17—Pollutant Emissions • Emissions measures, CO, HC, SO x • Emission Index = mass emit / mass fuel • Concentration (ppmv) – Dry or wet basis: convert between – Corrected concetrations (given O 2 basis) • SO x – From S in fuel: Coal, Diesel, (gasoline) – All S is converted to SO x , unlike NO x . – Limestone or lime scrubbing: CaCO 3 , CaO à hydrated CaSO 3 . • Wet or dry spray towers • Ash/soot – Baghouse • Unburnt HC/CO – Run lean, post combustion (3-way catalyst) – Engines: wall quenching/oil absorption....
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Lecture_27_notes - 1 1 Chemical Engineering 633 Combustion...

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