Numerical Study of a Laser-Induced Ethane Pyrolysis in a Wall-Less Reactor Using a Reduced Kinetic Scheme | Sciact - CRIS-system of Boreskov Institute of Catalysis

Numerical Study of a Laser-Induced Ethane Pyrolysis in a Wall-Less Reactor Using a Reduced Kinetic Scheme Full article

Conference

25th International Colloquium on the Dynamics of Explosions and Reactive Systems (ICDERS 2015)
02-07 Aug 2015 , Leeds

Source

Proceedings of the 25th International Colloquium on the Dynamics of Explosions and Reactive Systems (25th ICDERS)
Compilation, 2015.

Output data

Year: 2015, Pages: 303-308 Pages count : 6

Authors

Yang Junfeng ¹ , Matar Omar K. ¹ , Stadnichenko Olga A. ² , Snytnikov Valeriy N. ²

Affiliations

1	Imperial College London, London, the United Kingdom
2	Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia

Funding (1)

Skolkovo Foundation
BP Chemicals Limited, Research Laboratory

This work attempts to investigate laser induced ethane pyrolysis process in a wall-less reactor using computational fluid dynamics approach. As prior of CFD simulation, a reduced chemical kinetics which contains 10 species involving 15 reactions has been analyzed using sensitivity method and implemented into CFD code. To model the laser radiation effect, the discrete ordinates radiation model that solves the radiative transfer equation for a finite number of discrete solid angles has been employed. The laser beam was model as incident radiation source (located at the center of glass window) passing through the buffer gas (CH4) and be transmitted to reactants (C2H6/C2H4). The 3D CFD numerical experiments have been carried out according the practical experimental setup. The instantaneous contour for flow field, temperature field and species concentration have been plotted and compared for two different configuration of the reactor. It’s observed that the new reactor adopting laser induced technique yields a higher ethane pyrolysis rate than that of traditional reactor. The mechanism for this conversion growth is two-fold: enhanced ethane thermal decomposition due to radiation absorption of ethylene, and enhanced ethane chemical pyrolysis caused by autocatalytic route involving ethylene biradical. In order to prove this hypothesis, the fraction of hydrocarbon radicals needs to be measured quantitatively in the future work. In addition, these modelling results could be applied to optimize the reactor design and operating conditions for the upscaling reactor in which the reactor dimensions (diameter and length) and mass flow rate of reactants need to be increased and matched properly to obtain highest ethane conversion rate.

Yang J. , Matar O.K. , Stadnichenko O.A. , Snytnikov V.N.
Numerical Study of a Laser-Induced Ethane Pyrolysis in a Wall-Less Reactor Using a Reduced Kinetic Scheme
In compilation Proceedings of the 25th International Colloquium on the Dynamics of Explosions and Reactive Systems (25th ICDERS). 2015. – C.303-308.

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