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Research Paper

Applied Science and Convergence Technology 2021; 30(5): 137-140

Published online September 30, 2021

https://doi.org/10.5757/ASCT.2021.30.5.137

Copyright © The Korean Vacuum Society.

A Study on Direct Current Arc Plasma Torch Design with Preserve Nozzle for Perfluorinated Compounds (PFCs) Decomposition in Cement Kiln

Tae-Wook Kim , Gye-Young Jo , Soo-Min Lee , Kyu-Hang Lee , Ye-Jin Jin , and Byung-Koo Son*

Division of Plasma Convergence R&BD, Cheorwon Plasma Research Institute, Cheorwon 24047, Republic of Korea

Correspondence to:E-mail: byungkoo@cpri.re.kr

Received: July 2, 2021; Revised: July 22, 2021; Accepted: August 9, 2021

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (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

Perfluorinated compounds (PFCs), including sulfur hexafluoride (SF6), are used as insulating gases for heavy electric equipment, and are green-house gases with a very high global warming potential. For the thermal decomposition of greenhouse gases, a high temperature of 3,000 K or more and a technology to prevent recombination of the decomposed gases are required. A direct current plasma arc with a flame temperature of 6,000 K or higher provides an effective ultra-high temperature for the decomposition of chemically stable PFCs. A large amount of CaO, which is a raw material for clinker, is in the cement kiln, hence the S and F radicals decomposed from SF6 react with CaO to quickly convert it to CaF2 and CaSO4 and prevent their recombination. Therefore, the convergence technology of plasma and cement kiln is known as an effective method for treating PFCs. However, the interior of the cement kiln causes erosion of the plasma torch due to the turbulent flow of a large amount of combustion air at a high temperature of 1,500 °C or more, and the scattering of the raw material particles of the clinker, which greatly affects the operation stability. In this study, a plasma torch was developed that can maintain stable plasma in a vulnerable environment and effectively decompose PFCs. Moreover, the design and results of the experiment on the torch were presented to enable stable plasma operation for a long time in vulnerable environmental conditions through durability, plasma efficiency, and analysis of the discharge characteristics.

Keywords: Plasma torch, Perfluorinated compounds, SF6, Cement kiln

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