Numerical analysis of methane pyrolysis in thermal plasma for selective synthesis of acetylene

Numerical analysis of plasma gasification process was carried out base on the combination of magnetohydrodynamics (MHD) and computational fluid dynamics (CFD). A two stage gasification system which consists of a heater and a plasma rector was used to enhance syngas production in the present work. Nitrogen thermal plasma jet generated by a low power plasma torch was analyzed by a self-developed MHD code, and complex thermal flow field in the plasma reactor was simulated with a commercial CFD code. The accuracy of numerical simulation was confirmed from the comparison between numerical results and experimentally measured data of arc voltage and reactor temperature. From the numerical analysis, a high temperature for the thermal cracking of methane was expected in the upper region of the plasma reactor.

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Experimental Comparison of Methane Pyrolysis in Thermal Plasma

Plasma Chemistry and Plasma Processing ◽

10.1007/s11090-017-9806-x ◽

2017 ◽

Vol 37 (4) ◽

pp. 1033-1049 ◽

Cited By ~ 9

Author(s):

Tianyang Li ◽

Christophe Rehmet ◽

Yan Cheng ◽

Yong Jin ◽

Yi Cheng

Keyword(s):

Thermal Plasma ◽

Experimental Comparison ◽

Methane Pyrolysis

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Numerical analysis for co-condensation processes in silicide nanoparticle synthesis using induction thermal plasmas at atmospheric pressure conditions

Journal of Materials Research ◽

10.1557/jmr.2005.0351 ◽

2005 ◽

Vol 20 (10) ◽

pp. 2801-2811 ◽

Cited By ~ 30

Author(s):

Masaya Shigeta ◽

Takayuki Watanabe

Keyword(s):

Numerical Analysis ◽

Thermal Plasma ◽

Atmospheric Pressure ◽

Stoichiometric Composition ◽

Nanoparticle Synthesis ◽

Metal Vapor ◽

Formation Mechanisms ◽

Induction Thermal Plasma ◽

Electromagnetic Fluid ◽

Experimental Findings

Numerical analysis is conducted to clarify the formation mechanisms of silicide nanoparticles synthesized in an induction thermal plasma maintained at atmospheric pressure. The induction thermal plasma is analyzed by an electromagnetic fluid dynamics approach, in addition to a multi-component co-condensation model, proposed for the silicide nanoparticle synthesis. In the Cr–Si and Co–Si systems, silicon vapor is consumed by homogeneous nucleation and heterogeneous condensation processes; subsequently, metal vapor condenses heterogeneously onto liquid silicon particles. The Mo–Si system shows the opposite tendency. In the Ti–Si system, vapors of silicon and titanium condense simultaneously on the silicon nuclei. Each system produces nanoparticle diameters of around 10 nm, and the required disilicides, with the stoichiometric composition, are obtained. Only the Ti–Si system has a narrow range of silicon content. The numerical analysis results agree with the experimental findings. Finally, the correlation chart, predicting the saturation vapor pressure ratios and the resulting silicon contents, is presented for estimation of nanoparticle compositions produced in the co-condensation processes.

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