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Research Paper

Applied Science and Convergence Technology 2019; 28(4): 93-100

Published online July 31, 2019

https://doi.org/10.5757/ASCT.2019.28.4.93

Copyright © The Korean Vacuum Society.

Numerical Simulation of Cement Kiln Combined with Thermal Plasma for SF6 Pyrolysis

Juyoung Koa, Tae-Hee Kimb,*, and Sooseok Choia,b,*

aDepartment of Nuclear and Engineering, Jeju National University, Jeju 63243, Republic of Korea
bInstitute for Nuclear Science and Technology, Jeju National University, Jeju 63243, Republic of Korea

Correspondence to:E-mail: taeheekim@jejunu.ac.kr, sooseok@jejunu.ac.kr

Received: June 21, 2019; Revised: July 24, 2019; Accepted: July 24, 2019

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-CommercialLicense (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution,and reproduction in any medium, provided the original work is properly cited.

Abstract

Although SF6 gas has been used as insulation in electric power and transmission equipment, it is a very harmful greenhouse gas. SF6 can be injected inside the cement kiln, for pyrolysis and safe conversion, during cement production. As the temperature distribution inside a kiln is not uniform, the pyrolysis and conversion efficiency of SF6 are low. In this study, a kiln reactor combined with thermal plasma torches was applied to develop a high pyrolysis rate for SF6. A numerical analysis was conducted to investigate the variation of heat flow that thermal plasma causes inside the cement kiln. The simulations were conducted for kilns that did and did not include a thermal plasma torch. The results showed that the average temperature inside the kiln with thermal plasma was relatively low due to the gas-mixing effect of the latter; however, the peripheral temperature was stabilized. In addition, the temperature of the near kiln inlet increased. As a result, it is expected that the internal temperature of a kiln combined with thermal plasma technology will become uniform due to the gas-mixing effect of thermal plasma, and the SF6 pyrolysis efficiency will increase as the temperature of the local region rises.

Keywords: SF6, Decomposition and conversion, Numerical analysis, Cement kiln, Thermal plasma

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