Status of SF 6 separation/refining technology development for electric industry in Korea

Kim, Kyeongsook; Kim, Kwang Sin; Lee, Jeong Eun; Park, Seoksoon; Ahn, Chi-Kyu; Kim, Gook-Hee

doi:10.1016/j.seppur.2018.02.016

Cited by 39 publications

(13 citation statements)

References 19 publications

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“…Nowadays, SF 6 is extensively applied to gas-insulated switchgears (GIS) because of its excellent insulation and arc extinguishing properties [ 1 , 2 , 3 , 4 ]. In cases where the high-voltage insulation equipment has been working for a long time, partial overheating and discharge is very likely to occur, leading to the decomposition of SF 6 .…”

Section: Introductionmentioning

confidence: 99%

First-Principles Study of Au-Doped InN Monolayer as Adsorbent and Gas Sensing Material for SF6 Decomposed Species

2021

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As an insulating medium, sulfur hexafluoride (SF6) is extensively applied to electrical insulation equipment to ensure its normal operation. However, both partial discharge and overheating may cause SF6 to decompose, and then the insulation strength of electrical equipment will be reduced. The adsorption properties and sensing mechanisms of four SF6 decomposed components (HF, SO2, SOF2 and SO2F2) upon an Au-modified InN (Au-InN) monolayer were studied in this work based on first-principles theory. Meanwhile, the adsorption energy (Ead), charge transfer (QT), deformation charge density (DCD), density of states (DOS), frontier molecular orbital and recovery property were calculated. It can be observed that the structures of the SO2, SOF2 and SO2F2 molecules changed significantly after being adsorbed. Meanwhile, the Ead and QT of these three adsorption systems are relatively large, while that of the HF adsorption system is the opposite. These phenomena indicate that Au-InN monolayer has strong adsorption capacity for SO2, SOF2 and SO2F2, and the adsorption can be identified as chemisorption. In addition, through the analysis of frontier molecular orbital, it is found that the conductivity of Au-InN changed significantly after adsorbing SO2, SOF2 and SO2F2. Combined with the analysis of the recovery properties, since the recovery time of SO2 and SO2F2 removal from Au-InN monolayer is still very long at 418 K, Au-InN is more suitable as a scavenger for these two gases rather than as a gas sensor. Since the recovery time of the SOF2 adsorption system is short at 418 K, and the conductivity of the system before and after adsorption changes significantly, Au-InN is an ideal SOF2 gas-sensing material. These results show that Au-InN has broad application prospects as an SO2, SOF2 and SO2F2 scavenger and as a resistive SOF2 sensor, which is of extraordinary meaning to ensure the safe operation of power systems. Our calculations can offer a theoretical basis for further exploration of gas adsorbent and resistive sensors prepared by Au-InN.

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Section: Introductionmentioning

confidence: 99%

First-Principles Study of Au-Doped InN Monolayer as Adsorbent and Gas Sensing Material for SF6 Decomposed Species

2021

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“…SF6 purification is a well-established technology and there are several commercially available purification methods that SF6 users can choose from to meet their purification needs for non-radioactive decomposition products. 31,32,33 Detritiation technologies are also widely studied, however tritium systems are much less common in industry. 34 The overlap of the two technologies is confined to a series of publications on the International Thermonuclear Experimental Reactor (ITER) Neutral Beam Injector (NBI) system and the Tokamak Fusion Test Reactor (TFTR) Neutral Beam source.…”

Section: Treatment Optionsmentioning

confidence: 99%

“…The simplest approaches to separating SF6 from any impurities may be by cooling the SF6 to induce a phase change. An approach to purifying SF6 by solidification is described by Kim, et al 31 In that approach, SF6 gas is first pretreated with an adsorbent filter to remove solids, moisture, and possibly other impurities.…”

Section: Freezing Sf6mentioning

confidence: 99%

“…The vapor pressure of SF6 at its melting point still leaves a relatively large fraction (~4%) of the SF6 in the gas phase. 31 Repeated cycles of freezing the SF6, removing the gas-phase fraction, evaporating the purified SF6, then re-freezing the gas-phase fraction may be necessary to achieve the desired degree of overall purification.…”

Section: Freezing Sf6mentioning

confidence: 99%

“…It can result in very high purity (99.999%) SF6, but is reported to be very slow. 31 Kim et al also report a second liquefaction method, which only uses compression and cooling of the SF6 to -10 °C to achieve separation. Similar to the freezing and PSA methods, after the desired phase change, the gas-phase fraction remaining is removed.…”

Section: Liquefaction Of Sf6mentioning

confidence: 99%

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Status of SF 6 separation/refining technology development for electric industry in Korea

Cited by 39 publications

References 19 publications

First-Principles Study of Au-Doped InN Monolayer as Adsorbent and Gas Sensing Material for SF6 Decomposed Species

First-Principles Study of Au-Doped InN Monolayer as Adsorbent and Gas Sensing Material for SF6 Decomposed Species

Tritiated Sulfur Hexafluoride Disposition Strategies

Computational exploration of SF6 adsorption and decomposition on SiGe and calcium-decorated SiGe surfaces

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