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金烘?(Hong-Kyu Kim),宋基東(Ki-Dong Song),鄭鎭敎(Jin-Kyo Chong),吳年浩(Yeon-Ho Oh),朴敬燁(Kyong-Yop Park) 대한전기학회 2006 전기학회논문지 B Vol.55 No.10
To analyze the small current interruption performance for the gas circuit breakers, the gas density and electric field intensity should be calculated. In this paper, the FVFLIC method is used for the gas flow analysis and the FEM for the electric field analysis. Then, the dielectric withstanding voltage is evaluated by the empirical formulation or Streamer theory. By comparing the calculated dielectric strength with the test result, it is found that both methods show good prediction capability for the small current interruption performance. Especially, when both methods predict the same interrupting performance, the prediction is in accordance with the experimental result.
석유화학공정 슬러지의 악취저감제 개발 및 고형연료 활용방안 연구
김홍인 ( Hong-in Kim ),송근관 ( Kune-kwan Song ),오상근 ( Sang-kune Oh ),성기진 ( Ki-jin Seong ) 한국폐기물자원순환학회(구 한국폐기물학회) 2018 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2018 No.-
본 연구는 원유로부터 정제된 파라자일렌(Para Xylene)을 원료로 테레프탈산(TPA: Terephthalic acid)을 생산하는 공정에서 배출되는 저순도 테레프탈산 잔사인 CTA(Crude Terephthalic acid)의 악취저감을 위한 저감제 개발과 유기성슬러지의 고형연료 활용 방안에 관하여 연구하였다. TPA 석유화학 공정에서 발생되는 TPA 슬러지의 발생량은 0.3~0.4%/kg이며, 슬러지는 보관 또는 운송, 소각과정에서 끊임없이 악취를 발생시키며 대기환경에도 많은 영향을 끼친다. 이러한 악취로 인해 고효율의 열량을 가졌음에도 화력발전소의 연료로 이용하지 못하고 있는 실정이다. 악취저감제는 탄소수가 많은 고지방산과 비이온계면활성제 등을 일정 조성비로 혼합하여 실험하였고, fatty acid 15~30, mono fatty acid 20~35, linolenic acid 20~35, oleic acid 20~25, palmitic acid 5~10, non0ionic surface active agent 5~7% 구성성분 조성비를 갖는다. TPA 유기성 슬러지를 고형연료로 활용하기 위해 고형연료 품질시험에 따른 전 망목에 대해 실험하였다. 고형연료 샘플 500g을 기준으로 TPA 슬러지와 TPA 슬러지에 애쉬 10%를 첨가한 시료 각 두 종류에 대하여 실험한 결과 저위발열량 기준 3,960과 3,540 kcal/kg으로 각각 나타나 고형연료제품 품질기준 3,500 kcal/kg 이상을 만족하여 활용가치가 높은 것으로 나타났다. 또한 염소 0.03%, 황분·수은·카드늄·납·비소·안티몬 불검출, 크롬 45.4mg/kg, 코발트 5,400 mg/kg, 구리 145 mg/kg, 망간 1,300 mg/kg, 니켈 44.4 mg/kg, 탈륨·바나듐 불검출로 나타났다. 악취저감을 위한 pilot-plant는 그림 1과 같이 구성하여 실험하였고, 악취저감제는 0~25% 슬러지 중량비로 주입하여 처리특성을 조사였다.
핏치계 탄소섬유 제조에 있어서 산화공정이 물성에 미치는 영향
김홍,성하진,권영배,Kim, Hong,Seong, Ha-Jin,Gwon, Yeong-Bae 한국기계연구원 1985 기계연구원소보 Vol.15 No.-
Fibers with a high degree of axial preferred orientation can be obtained from mesophase pitch. Prior to cabonization, the pitch fibers must be rendered in fusible so that their orientation is preserved. The stabilization of the pitch fibers was heated at temperature between $250^{circ}C$ and $300^{circ}C$ and a treatment time 5 to 80minutes. Oxidized fibers heated $1800^{circ}C$without stretching. Pitch based carbon fiber have a young's modulus as high as 304GN/$m^2$. The structure of the pitch cased carbon fiber is determining factor for the mechanical properties of the produced fibers. The structure depending on the pitch precursor as well as on the oxidation time.
Ni-Cr-Mo계 고강도 저합금강 용접클래드 계면의 미세조직 특성 평가
김홍은 ( Hong Eun Kim ),이기형 ( Ki Hyoung Lee ),김민철 ( Min Chul Kim ),이호진 ( Ho Jin Lee ),김경호 ( Keong Ho Kim ),이창희 ( Chang Hee Lee ) 대한금속재료학회(구 대한금속학회) 2011 대한금속·재료학회지 Vol.49 No.8
SA508 Gr.4N Ni-Cr-Mo low alloy steel, in which Ni and Cr contents are higher than in commercial SA508 Gr.3 Mn-Mo-Ni low alloy steels, may be a candidate reactor pressure vessel (RPV) material with higher strength and toughness from its tempered martensitic microstructure. The inner surface of the RPV is weld-cladded with stainless steels to prevent corrosion. The goal of this study is to evaluate the microstructural properties of the clad interface between Ni-Cr-Mo low alloy steel and stainless weldment, and the effects of post weld heat treatment (PWHT) on the properties. The properties of the clad interface were compared with those of commercial Mn-Mo-Ni low alloy steel. Multi-layer welding of model alloys with ER308L and ER309L stainless steel by the SAW method was performed, and then PWHT was conducted at 610℃ for 30 h. The microstructural changes of the clad interface were analyzed using OM, SEM and TEM, and micro-Vickers hardness tests were performed. Before PWHT, the heat affected zone (HAZ) showed higher hardness than base and weld metals due to formation of martensite after welding in both steels. In addition, the hardness of the HAZ in Ni-Cr-Mo low alloy steel was higher than that in Mn-Mo-Ni low alloy steel due to a comparatively high martensite fraction. The hardness of the HAZ decreased after PWHT in both steels, but the dark region was formed near the fusion line in which the hardness was locally high. In the case of Mn-Mo-Ni low alloy steel, formation of fine Cr-carbides in the weld region near the fusion line by diffusion of C from the base metal resulted in locally high hardness in the dark region. However, the precipitates of the region in the Ni-Cr-Mo low alloy steel were similar to that in the base metal, and the hardness in the region was not greatly different from that in the base metal.
암모니아 용액중(溶液中)에서 바나듐의 용해(溶解)와 침전거동(沈澱擧動)
박경호,김홍인,이진영,Park, Kyung-Ho,Kim, Hong-In,Lee, Jin-Young 한국자원리싸이클링학회 2008 資源 리싸이클링 Vol.17 No.1
암모니아 용액중에서 바나듐(V)의 침출 시 바나듐의 용해와 후공정에서 $NH_4VO_3$로 침전 회수를 위한 조건에 관한 기초연구를 수행하였다. 침출공점에서 바나듐의 용해도를 높이기 위해서는 높은 온도가 필요하며 $(NH_4)_2CO_3$ 20g/L와 $NH_4OH$ 2.5M의 혼합 용액에서 반응온도가 $90^{\circ}C$일 때 용액 중 바나듐 농도가 16.8g/L이다. 한편 용해된 바나듐을 침전물 형태로 회수하기 위해서는 $25^{\circ}C$에서 $NH_4Cl$을 20g/L를 첨가하고 72시간 정치했을 때 용액에 잔류 바나듐의 농도를 0.0268g/L까지 낮출 수 있었으며 이 경우 바나듐의 회수율은 99.8%이었다. This study was carried out to investigate the solubility of vanadium in ammoniacal solution and precipitation of $NH_4VO_3$ as a function of temperature and addition of ammonia salt. Higher solution temperature is required to get high solubility of vanadium and the vanadium concentration of solution was 16.8g/L at $90^{\circ}C$ with the solution of 20 g/L $(NH_4)_2CO_3$ and 2.5M $NH_4OH$. From this solution, vanadium could be precipitated up to 99.8% with adding 20 g/L $NH_4Cl$, 72 hours settling time at $25^{\circ}C$.