• Title, Summary, Keyword: Air decomposition by-product

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Experimental Study on Air Decomposition By-Product Under Creepage Discharge Fault and Their Impact on Insulating Materials

  • Javed, Hassan;LI, Kang;Zhang, Guoqiang;Plesca, Adrian Traian
    • Journal of Electrical Engineering and Technology
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    • v.13 no.6
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    • pp.2392-2401
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    • 2018
  • Creepage discharge faults in air on solid insulating material play a vital role in degradation and ageing of material which ultimately leads to breakdown of power equipment. And electric discharge decompose air in to its by-products such as Ozone and $NO_x$ gases. By analyzing air decomposition gases is a potential method for fault diagnostic in air. In this paper, experimental research has been conducted to study the effect of creepage discharge on rate of generation of air decomposition by-products using different insulating materials such as RTV, epoxy and fiberglass laminated sheet. Moreover XRF analysis has been done to analyze creepage discharge effect on these insulating materials. All experiments have been done in an open air test cell under constant temperature and pressure conditions. While analysis has been made for low and high humidity conditions. The results show that the overall concentration of air decomposition by-products under creepage discharge in low humidity is 4% higher than concentration measured in high humidity. Based on this study a mathematical relationship is also proposed for the rate of generation of air decomposition by-products under creepage discharge fault. This study leads to indirect way for diagnostic of creepage discharge propagation in air.

Effect of Mixed Gases on Decomposition Characteristic of CF4 by Non-Thermal Plasma (비열플라즈마를 이용한 CF4 분해에 미치는 혼합가스의 영향)

  • 박재윤;정장근;김종석;임근희
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.15 no.6
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    • pp.543-550
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    • 2002
  • In this paper, the $CF_4$ decomposition rate and by-product were investigated for two simulated plasma reactors which are metal particle reactor and spiral wire reactors as a function of mixed gases. The $CF_4$ decomposition rate by plasma reactor with metal particle electrode had a gain of 20~25% over that by plasma reactor with spiral wire electrode. The $CF_4$ decomposition efficiency increases with increasing applied voltage up to the critical voltage for spark formation. The $CF_4$ decomposition efficiency of metal particle reactor was about 80% at AC 24kV. The $CF_4$ decomposition rate used Ar-$N_2$ as base gas was the highest among three base gases of $N_2$, $Ar-N_2$, air. The by-products of the $N_2$, $N_2Ar$ base as were similar, but in case of air base they were different.

Study on the Decomposition of Some Volatile Organic Compounds by Photocatalyst Plasma Reaction (광촉매 플라즈마 반응에 의한 몇가지 VOCs의 제거에 관한 연구)

  • 허경욱
    • Journal of Korean Society for Atmospheric Environment
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    • v.16 no.4
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    • pp.373-380
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    • 2000
  • A new type of photocatalyst plasma air purification filter for decomposition of some VOCs has been developed. The photocatalyst plasma air purification filter employs the pulsed discharge plasma as an energy source of TiO2. photocatalyst instead of UV light. In closed room(2m3) test removal efficiency of some VOCs was 80∼100% in 15∼24 hours. In the initial step of phptocatalyst plasma reaction. Acetone and Nitromethane etc were detected. But they were completely oxidized to CO2 and H2O.

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Effect of Non-thermal plasma Reactor construction by $CF_4$ decomposition ($CF_4$ 분해에 미치는 비열플라즈마 반응기 구조의 영향)

  • Kim, Sun-Ho;Park, Jae-Yun;Ha, Hyun-Jin;Hwang, Bo-Guk;Kim, Kwang-Soo;Rim, Geun-Hie
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.912-916
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    • 2002
  • In this paper, the $CF_4$ decomposition rate and by-product were investigated for a simulated two plasma reactors which are metal particle reactor and spiral wire reactor as function of mixed gases. The $CF_4$ decomposition rate by plasma reactor with metal particle electrode had a gain of 20~25[%] over that by plasma reactor with spiral wire electrode. The $CF_4$ decomposition efficiency increases with increasing applied voltage up to the critical voltage for spark formation. The $CF_4$ decomposition efficiency of metal particle reactor was about 80[%] at AC 24[kV]. The $CF_4$ decomposition rate used $Ar-N_2$ as base gas was the highest among three base gases of $N_2$, $Ar-N_2$, air. The by-products of the $N_2$, $Ar-N_2$ base as were similar, but in case of air base they were different.

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Thermal Decomposition of Ammonium Salts of Transition Metal Oxyacids. V. Study on the Thermal Decomposition of Ammonium Metavanadate (전위금속의 산소산염의 열분해에 관한 연구 (제5보) Ammonium Metavanadate의 열분해에 따르는 $V_2O_5$의 생성)

  • Il-Hyun Park
    • Journal of the Korean Chemical Society
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    • v.16 no.3
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    • pp.157-165
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    • 1972
  • Thermal decomposition of ammonium metavanadate has been investigated by using the quartz spring balance and differential thermal analysis. It showed that the decomposition of ammonium metavanadate is proceeded at two stages which correspond to $180^{\circ}C-220^{\circ}C$ and $310^{\circ}C-330^{\circ}C$ decomposition temperatures, respectively. Evolved ammonia gas in thermal decomposition has been analyzed quantitatively by titration. And the constituents of gases evolved have been evaluated by gas chromatography and omegatron spectrometer. From these results, it was concluded that the gases evolved in the first step decomposition were $NH_3$ and $H_2O$ with 2:1 ratio and the second step decomposition corresponded to the formation of $NH_3$, $H_2O$ and $N_2O$ which was produced in oxidation of $NH_3$ by $V_2O_5$. The decomposition products were identified by means of X-ray diffraction method. The decomposition product in air was V_2O_5 and the product in vacuum $V_3O_7.$ The kinetics of the thermal decomposition was studied, giving the values of the activation energy of 41.4 kcal/mole and 64.4 (kcal/mole) respectively.

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Synthesis of thin-multiwalled carbon nanotubes by Fe-Mo/MgO catalyst using sol-gel method

  • Dubey, Prashant;Choi, Sang-Kyu;Kim, Bawl;Lee, Cheol-Jin
    • Carbon letters
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    • v.13 no.2
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    • pp.99-108
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    • 2012
  • The sol-gel technique has been studied to fabricate a homogeneous Fe-Mo/MgO catalyst. Ambient effects (air, Ar, and $H_2$) on thermal decomposition of the citrate precursor have been systematically investigated to fabricate an Fe-Mo/MgO catalyst. Severe agglomeration of metal catalyst was observed under thermal decomposition of citrate precursor in air atmosphere. Ar/$H_2$ atmosphere effectively restricted agglomeration of bimetallic catalyst and formation of highly-dispersed Fe-Mo/MgO catalyst with high specific surface-area due to the formation of Fe-Mo nanoclusters within MgO support. High-quality thin-multiwalled carbon nanotubes (t-MWCNTs) with uniform diameters were achieved on a large scale by catalytic decomposition of methane over Fe-Mo/MgO catalyst prepared under Ar-atmosphere. The produced t-MWCNTs had outer diameters in the range of 4-8 nm (average diameter ~6.6 nm) and wall numbers in the range of 4-7 graphenes. The as-synthesized t-MWCNTs showed product yields over 450% relative to the utilized Fe-Mo/MgO catalyst, and indicated a purity of about 85%.

A Study on the Decomposition Characteristics of PVC and PS Mixtures with ZnO in Air Atmosphere (공기분위기에서 ZnO를 첨가한 PVC와 PS 혼합물의 분해특성에 관한 연구)

  • Oh, Sea Cheon;Jung, Myung Uk;Jun, Hyun-Chul;Kim, Hee Taik;Lee, Hae Pyeong
    • Applied Chemistry for Engineering
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    • v.17 no.2
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    • pp.229-234
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    • 2006
  • The effect of ZnO in the decomposition of poly(vinyl chloride) (PVC) and polystyrene (PS) mixtures in air atmosphere has been studied by thermogravimetry (TG) and gas chromatograph-mass spectrometry (GC-MS) under various mixing ratios and reaction temperatures. From this work, it can be seen that the yields of a liquid product were increased with the increase of PS in mixtures, whereas those of gaseous products were decreased. And the yields of a gaseous product and HCl were decreased with the increase of ZnO in mixtures. It was also found that HCl was rarely produced at ZnO/Mixture = 0.5 by the effect of ZnO in dehydrochlorination of PVC.

The Effect of Thermal Decomposition of Epoxy Resin for a Variation of Hardener (에폭시수지의 경화제 변화량에 따르는 열분해 영향)

  • Park, Keun-Ho;Lee, Yong-Sook;Song, Ju-Yeong;Lee, Soo;Kim, Sung-Il
    • Journal of the Korean Applied Science and Technology
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    • v.24 no.4
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    • pp.393-398
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    • 2007
  • We investigated heat stability of epoxy resin products and epoxy resin according to the influence hardener. The heat flow which shows the degree of thermal decomposition of the epoxy resin product and epoxy resin measured by using the differential scanning calorimeter (DSC). As a result, we found that in the case of heat stability for epoxy resin as hardener was added, the ratio of one to one (epoxy resin : hardener) was the most suitable in air condition and nitrogen atmosphere.

Decomposition of Acetonitrile by Planar Type Dielectric Barrier Discharge Reactor (평판형 유전체 장벽 방전 반응기에서 Acetonitrile의 분해 특성)

  • 송영훈;김관태;류삼곤;이해완
    • Journal of the Korea Institute of Military Science and Technology
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    • v.5 no.3
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    • pp.105-112
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    • 2002
  • A combined process of non-thermal plasma and catalytic techniques has been investigated to treat toxic gas compounds in air. The treated gas in the present study is $CH_3$CN that has been known to be a simulant of toxic chemical agent. A planar type dielectric barrier discharge(DBD) reactor has been used to generate non-thermal plasma that produces various chemically active species, O, N, OH, $O_3$, ion, electrons, etc. Several different types of adsorbents and catalysts, which are MS 5A, MS 13X, Pt/alumina, are packed into the plasma reactor, and have been tested to save power consumption and to treat by-products. Various aspects of the present techniques, which are decomposition efficiencies along with the power consumption, by-product analysis, reaction pathways modified by the adsorbents and catalysts, have been discussed in the present study.

A Study on the Performance Evaluation and by-product of styrene decomposition by Non-thermal Plasma Processing (플라즈마 공정에 의한 Styrene 처리에 관한 성능 평가 및 부산물 동정 연구)

  • 박정욱;전보경;최금찬
    • Proceedings of the Korea Air Pollution Research Association Conference
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    • pp.69-70
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    • 2003
  • 최근 실내공기 질(IAQ : Indoor Air Quality)에 관한 인식이 높아지고 있으며 환경개선에 상응하는 기술 개발의 중요성이 크게 부각되고 있다. 실제 산업체에서는 여러 가스정화기술들이 오염물질제거에 이용되어 왔고, 그 한 분야인 N.T.P(Non-thermal plasma Process) 공정도 다양한 각도에서 연구가 수행되어 왔다. 그러나, 이 기술의 실용화를 위한 설계변수 개념의 연구는 부족한 실정으로, 이에 본 연구는N.T.P 공정에 의한 가스정화의 반 경험식 도출과 이를 이용한 성능 평가 고찰이 주목적이다. 또한, 반응기 통과 후 나오는 부산물을 동정하여, 차후 후단에 사용할 촉매를 결정 하고자 한다. (중략)

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