Lecture_16_notes

Lecture_16_notes - Chemical Engineering 633 Combustion...

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1 1 Chemical Engineering 633 Combustion Processes Class 16—Pollutants Outline • Measurements – Emissions index – Basis – Corrected Concentrations • CO/unburnt hydrocarbons • SO x • Particles – Tour baghouse 2
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2 Concentrations Emissions index Many units for measurement (g/miles, lb/MMBtu, ppm). Which to use? Problems/confusion? How to deal with dilution? Emissions index is most straightforward. EI = m i,emit / m f,burned Pollution / mass of fuel Independent of dilution Process dependent 3 EI = x i x CO + x CO 2 · n c n f · M i M f EI (=) moles i moles c · moles c moles f · M i M f Dry/Wet basis, Corrected Conc. Measurements are often made on a dry basis (water interferes). Conversion (Turns 15.7): True for rich or lean Corrected concentrations If express emissions as concentrations, need to specify the basis, or else one could reduce “emissions” by diluting the effluent! Correct to 3% O
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Lecture_16_notes - Chemical Engineering 633 Combustion...

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