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Formation of Cyclic Compounds in Cracking Reactions for Hydrocarbon-Fueled High Speed Vehicles FREE

[+] Author Affiliations
R. C. Striebich

University of Dayton Research Institute, Dayton, OH

L. Q. Maurice, T. Edwards

Air Force Research Laboratory, Wright-Patterson AFB, OH

Paper No. 99-GT-136, pp. V002T02A028; 7 pages
doi:10.1115/99-GT-136
From:
  • ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 2: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations
  • Indianapolis, Indiana, USA, June 7–10, 1999
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7859-0
  • Copyright © 1999 by ASME

abstract

An endothermic fuel pyrolytic reactor may favor the formation of benzene and polynuclear aromatic hydrocarbon (PAH) soot precursors which degrade fuel system performance. Both experimental and computational studies are in progress which verify the formation of multi-ring aromatic compounds in endothermic thermal cracking processes. Classic gas phase pyrolytic soot mechanisms may be effective for the prediction of soot precursor concentrations. Hence, a need exists to examine thermal molecular growth processes in a versatile experimental apparatus which can help guide modeling efforts and increase basic understanding (and mitigation) of growth mechanisms. In the present work, cyclic formation experimental data are presented for three mixtures: n-decane, 90 volume % n-decane/10 volume % toluene, and 80 volume % n-decane/20 volume % toluene pyrolysis in a System for Thermal Diagnostic Studies (STDS). The data are qualitatively and quantitatively compared to computations at temperatures, pressures and residence times commensurate with those encountered in endothermic fuel reactor systems. These computations are an attempt to assess the applicability of gas-phase kinetic mechanisms to predict the chemistry of thermal decomposition in the fuel system. Preliminary results show the prominence of molecular growth reactions similar to gas phase pyrolysis mechanisms, starting with hydrocarbon unsaturation, cyclization, and finally, benzene, toluene and heavier PAH formation. Experimental results to date show general qualitative agreement to computational models. However, it is clear that molecular growth mechanisms found to be unimportant at the high temperatures generally associated with combustion can play a significant role in fuel systems.

Copyright © 1999 by ASME
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