Modeling of Perfluorocarbons Decomposition in Nitrogen Thermal Plasma


  • S. W. Chau Department of Engineering Science and Ocean Engineering, National Taiwan University, 1, Sec. 4, Roosevelt Rd., 10617 Taipei
  • S. H. Chen Physics Division, Institute of Nuclear Energy Research, 1000 Wenhua Rd., Longtan, 32546 Taoyuan



perfluorocarbons decomposition, nitrogen, thermal plasma, direct-current, plasma torch


This paper develops an axisymmetric flow model to predict the flow field inside a directcurrent plasma torch reactor, where the magneto-hydrodynamic equations, including the continuity, momentum, energy and current continuity equations as well as turbulence transport equations are solved with a finite volume discretization in a segregated manner. The thermodynamic and transport coefficients of thermal plasma are obtained from the condition of local thermal equilibrium, whereas a kinetics model is employed to consider the production and destruction of species due to the chemical reactions in a decomposition process. Species transport phenomena arising in the decomposition process are described by the transport equations for different species. The perfluorocarbons decomposition characteristics in a well-type, non-transferred nitrogen torch reactor are analyzed by the proposed numerical model to disclose the influence of working parameters on the decomposition efficiency.


S.H. Narengerile and T. Watanabe. Decomposition mechanism of fluorinated compounds in water plasmas generated under atmospheric pressure. Plasma Chem. Plasma Process, 30(6):813–829, 2010. doi:10.1007/s11090-010-9259-y.

M.S. Lim, S.C. Kim, and Y.N. Chun. Decomposition of PFC gas using a water jet plasma. J. Mech. Sci. Tech., 25(7):1845–1852, 2011. doi:10.1007/s12206-011-0422-z.

S.W. Chau, S.Y. Lu, and P.J. Wang. Modeling of axis-symmetric steam plasma flow in a non-transferred torch. Comp. Phys. Comm., 182(1):152–154, 2011. doi:10.1016/j.cpc.2010.08.011.

B.E. Launder and D.B. Spalding. The numerical computation of turbulent flows. Comp. Methods in Appl. Mech. Eng., 3(2):269–289, 1974. doi:0.1016/0045-7825(74)90029-2.

S.W. Chau, C.M. Tai, and S.H. Chen. Nonequilibrium modeling of steam plasma in a nontransferred direct-current torch. IEEE Tran. Plasma Sci., 42(12):3797– 3808, 2014. doi:10.1109/TPS.2014.2365479.

S.W. Chau. PhD Disseration. Universita¨t Hamburg, 1997.

K.C. Hsu, K. Etemadi, and E. Pfender. Study of the free-burning high-intensity argon arc. J. Appl. Phys., 54(3):1293–1301, 1983. doi:10.1063/1.332195.