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http://dx.doi.org/10.18770/KEPCO.2020.06.01.053

Evaluation of a Prototype SF6 Purification System for Commercialization  

Seo, Hai-Kyung (KEPCO Research Institute, Korea Electric Power Corporation)
Lee, Jeong Eun (KEPCO Research Institute, Korea Electric Power Corporation)
Kim, Kwang Sin (KEPCO Research Institute, Korea Electric Power Corporation)
Kim, Kyeongsook (KEPCO Research Institute, Korea Electric Power Corporation)
Publication Information
KEPCO Journal on Electric Power and Energy / v.6, no.1, 2020 , pp. 53-58 More about this Journal
Abstract
Korea Electric Power Corporation (KEPCO) uses large amount of SF6, one of the potent greenhouse gases, in electric equipment for electrical insulation. KEPCO is developing SF6 recovery and purification technology to minimize the release of SF6 into the environment, to secure certified emission reduction, and to save purchase cost of new SF6 by reusing the refined SF6. A prototype SF6 purification system using cryogenic solidification technology has been built in demonstration scale. To evaluate the feasibility of the commercialization, the system has been operated to purify large amount of used SF6 in a long-term operation and the performance has been economically evaluated. The system was stable enough for commercial operation such that it was able to purify 5.4 tons of used SF6 from power transmission equipment in 2-month operation. Over 99% of the SF6 was recovered from the used gas and the purity of the purified gas was over 99.7 vol%. The operation cost, which is the cost of refrigerant (liquid nitrogen), electricity and labor, per kilogram of purified SF6 was 6,526 KRW. Considering the price of new SF6 in Korea is about 15,000 KRW per kilogram this year, about 56% of the purchase cost can be saved.
Keywords
$SF_6$; $SF_6$ Recovery; $SF_6$ Purification; Cryogenic Solidification; Liquid Nitrogen; Demonstration Scale;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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