Characterisation of coking activity during supercritical hydrocarbon pyrolysis
Résumé
The active cooling of the Supersonic Combustion Ramjet engine, for hypersonic flight purpose, is ensured thanks to fuel, n-dodecane for the present study. The endothermic fuel pyrolysis, starting above 800 K, could generate an unwanted coke formation. Experimental tests up to 1125 K and between 1 MPa and 6 MPa have been performed on the hydrocarbon fuel pyrolysis to evaluate the coking activity. 316L stainless steel, low carbon steel and titanium reactors have been considered. A witness of the coke formation, based on its thermal insulation and pressure loss effects, has been found. A correlation between methane production and coke deposit was found. The coke has been studied with Scanning Electron Microscope (SEM), Energy Dispersion Spectroscopy (EDS), X-ray diffractometer and Fourier Transform Infrared (FTIR) spectroscopy. The porosity, the density and the permeability of the coke have been estimated. © 2008 Elsevier B.V. All rights reserved.
Mots clés
Carbon steel
Chemical reactions
Coke
Combustion
Electron energy loss spectroscopy
Fourier transform infrared spectroscopy
Fourier transforms
Hydrocarbons
Infrared spectroscopy
Methane
Organic compounds
Petroleum chemistry
Pyrolysis
Ramjet engines
Scanning electron microscopy
Steel
Thermal insulation
Thermogravimetric analysis
Titanium
316l stainless steels
Active cooling
Catalytic effect
Characterisation
Coke deposits
Coke formations
Dodecane
Energy dispersions
Experimental tests
Fourier transform infrared
Fuel pyrolysises
Hydrocarbon fuels
Hydrocarbon pyrolysis
Hydrocarbon pyrolysises
Hypersonic flights
Low carbon steels
Methane productions
n-Dodecane
Pressure losses
Scanning electron microscopes
Supercritical
Supercritical state
Supersonic combustion ramjet engines
Stainless steel
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