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수산화물에 의해 활성화된 OXI-PAN계 섬유의 제조 및 특성
문숙영,한동윤,이병하,임연수,Moon, Sook-Young,Han, Dong-Yun,Lee, Byung-Ha,Lim, Yun-Soo 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.7
Activated Carbon Fibers (ACFs) are widely used as adsorbents in technologies related to pollution abatement due to their highly porous structure and large adsorption capacity. The porous structure and surface area of ACFs depends strongly on both the activation processes arid the nature .of the precursors. The chemical activation with hydroxides has recently been, of great interest as it permits the preparation of activated carbon fibers with highly developed porosity. In this work, OXI-PAN fiber used as precursor for the preparation of activated carbon fibers by chemical activation with KOH and NaOH. The affects of several activation conditions on the surface properties, pore size distribution and adsorption capacity of Ag ion and Iodine ion on ACFs studied.
계통연계 태양광발전시스템과 회전계자형 동기발전기의 병렬운전 특성
류연수(Ryu Yeon-Soo),유왕진(Yoo Wang-Jin),이철규(Lee Checl-Gyu),문종범(Moon Jong-Beom) 한국태양에너지학회 2008 한국태양에너지학회 학술대회논문집 Vol.- No.-
Through simulations and field experiment on A.C. parallel operation of both Utility Interactive Photovoltaic System and Diesel Engine Revolving Field Type Synchronous Generator, following factors have been found. First, the inverter should be operated in three modes of frequency(mode.1: ±0.3 ㎐ mode.2: ±l ㎐ mode.3: ±2 ㎐ as default, considering properties of operating Synchronous Generator. Second, as a result of supplying 13.5 ㎾ of residual power, it has been found that Synchronous Generator takes the power input only as reactive power, because it was electrically stable with frequency of 60.14㎐ and high voltage of 222.3V even when power factor was -0.94. Besides, it was mechanically stable, too, because the quake, noise, and temperature of Synchronous Generator in this case were 7.5 ㎜/s, 97 ㏈ and 6 ℃ respectively, which were lower than normal load connection of 145.6 ㎾ 11.03 ㎜/s. Thus, load share of Revolving Field Type Synchronous Generator reduces according to the supply of Photovoltaic System to the load power. In this experiment, 200㎾ of Synchronous Generator and 40 ㎾ of Photovoltaic System were operated in parallel. The load share was 20% in maximum, and 11.1lit/hr of fuel was saved.
문숙영 ( Sook Young Moon ),한동윤 ( Dong Yun Han ),이병하 ( Byung Ha Lee ),임연수 ( Yun Soo Lim ) 한국유화학회 2005 한국응용과학기술학회지 Vol.22 No.1
N/A OXI-PAN fibers, Kynol fibers and rayon fibers were used as precursorsfor the preparation of activated carbon fibers (ACFs) by chemical activation with KOH at 800 C. The effects of different precursorfibers and fiber/KOH ratios on the final ACFs are discussed. The precursor fibers used are appropriate for the ACFs in a single stage pyrolysis process. The OXI-PAN fibers which were activated with KOH of 2.0M showed a specific surface area of 2328㎡/g, however, loosed the fiber shape because of low yields. The Kynol fibers and Rayon fibers showed the high yields but the lower specific surface area of 900㎡/g and 774㎡/g, respectively, at KOH of 1.5M. The OXI-PAN fibers which were activated with KOH of 1.5M have a specific surface area of 1028㎡/g and higher micro-pore volumes and lower yields rather than Kynol-1.5 and Rayon-1.5 samples. This phenomenon is because of higher chemical resistance of the Kynol and Rayon fibers rather than OXI-PAN fibers. However, the Kynol fibers were the best precursors on KOH activation at 800℃ considered carbon yields, surface areas and micropore volumes.