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
- Stainless steel
- 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
- Methane
- Carbon steel
- Chemical reactions
- Coke
- Combustion
- Electron energy loss spectroscopy
- Fourier transform infrared spectroscopy
- Fourier transforms
- Hydrocarbons
- Infrared spectroscopy
- Active cooling
- Organic compounds
- Petroleum chemistry
- Pyrolysis
- Ramjet engines
- Scanning electron microscopy
- Steel
- Thermal insulation
- Thermogravimetric analysis
- Titanium
- 316l stainless steels
Domaines
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