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Effects of Aromatic Species on Soot Particle Size Distribution and Species Concentration in a Well Stirred Reactor/Plug Flow Reactor.


pdf icon Effects of Aromatic Species on Soot Particle Size Distribution and Species Concentration in a Well Stirred Reactor/Plug Flow Reactor. (336 K)
Manzello, S. L.; Lenhert, D. B.; Stroud, C. B.; Tsang, W.

Paper F09;

Combustion Institute/Western States. Fifth (5th) Joint Meeting of the U.S. Sections. Meeting Theme: Fundamentals of Combustion, Air Pollution and Global Warming, Alternative Fuels. Hosted by The University of California. March 25-28, 2007, San Diego, CA, 1-9 pp, 2007.

Keywords:

combustion; soot; particle size distribution; aromatics; additives; polycyclic aromatic hydrocarbons; fuel/air ration; benzene; soot inception; ethylene; air; residence time; soot formation; injection; probes; experiments; gas chromatography; mass spectrometers

Abstract:

A well-stirred-reactor (WSR) followed by a plug flow reactor (PFR) is being used to study PAR growth and soot inception. For a given fuel-air system, there is a unique fuel-to-air equivalence ratio corresponding to soot inception. This point has been determined for ethylene-air combustion in the WSR/PFR and detailed characterization of the soot particle size distribution and species concentration in the vicinity of this point with and without the addition of specific species (aromatics) thought to be important for soot formation processes were investigated. Two different dilution probes designed for the WSR and PFR sections were coupled to a nano-differential mobility analyzer (nano-DMA) to understand the influence of aromatic species on soot particle size distributions. Concurrently, a gas chromatograph coupled to a mass spectrometer (GCIMS) was used to analyze samples extracted nom the WSR/PFR at a known residence time for a given equivalence ratio and additive concentration. These highly resolved measurements are being used to develop and validate a quantitative kinetic database for P AH growth and a soot inception model. Results obtained for benzene are discussed.