(509bc) Blending Rule for Predicting the Sooting Tendencies of Gasoline Mixtures from the Individual Components
AIChE Annual Meeting
Wednesday, November 10, 2021 - 3:30pm to 5:00pm
With the growing importance of climate change, soot has been receiving increasing attention since it is the second largest source of global warming . A sooting tendency can be used to quantify the extent of soot formation in a combustion device for a given fuel molecule. However real fuels are complex mixtures of multiple components. In this work, we are using both experimental and computational methods to investigate how the sooting tendency of a blended fuel mixture is related to the sooting tendencies of the individual components. A test matrix was formulated that includes sixteen mixtures of six components that are representative of the main categories of hydrocarbons in gasoline (n-heptane for alkanes, isooctane for isoalkanes, methylcyclohexane for naphthenes, toluene for aromatics, 1-hexene for olefins, and ethanol for oxygenates). The mixtures contain up to five components. Sooting tendency was characterized by yield sooting index (YSI), which is the soot yield when a methane/air flame is doped with 1000 ppm of the test fuel. The YSI of each mixture has been measured experimentally and determined computationally from detailed flame simulations using procedures in [2, 3]. Preliminary results show that the blending behavior is linear, i.e., YSImix = Î£j Xj YSIj, where YSImix is the sooting tendency of the mixture, Xj is the mole fraction of component j, YSIj is the sooting tendency of component j as a pure compound, and the sum is over all the components j in the mixture.
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