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구두발표(OA)-농업환경 및 토양,수질 분야 : 석탄회 혼합토양에서 석탄재 유래 부식물질의 특성 평가
김길원 ( Gilwon Kim ),김필주 ( Pil Joo Kim ) 한국환경농학회 2014 한국환경농학회 학술대회집 Vol.2014 No.-
Coal ash is produced at rate of 12.20% by weight of the original coal when coal is burned to produce steam for electricity generation. Korea consumes approximately 42 million tons of coal annually to generate electricity, and generates around 6 million tons of coal ash annually. However, only 60% of the coal ash by.products are recycled, while 40% are buried at the power plant site. In particular, most of bottom ash was landfilled, and then properly recycling methodology should be developed. Bottom ash is well known as soil amendment and high organic matter (ca. 0.3.15%) containing material. However, the function of organic matter containing in coal bottom ash as it applied in soil as an amendment was not studied well. In this study, in order to evaluate the properties of ash containing organic matter when it applied in soil as amendment, the chemical characteristics of humic substances in the coal bottom ash mixed soils were compared with the pure soil. We collected two types of soil from the landfill cover simulator which is bottom mixed soil (BA35% + soil 65%) and only soil (100%) treatment in the 5th year after installation. The soil organic matter was fractionized with humic, fulvic acid and humin by using the sequential extraction method. The chemical structure of humic substances was characterized by 13C NMR spectroscopy. Bottom ash mixed soil has 5 times higher total organic C content than the pure soil. In addition, humic substance C content was also higher in the bottom ash mixed soil with the similar composition ratio with total organic C content. However, there was no significant difference of chemical composition of humic substances between the bottom ash mixed soil and the pure soil. Aromatic group of humic acid and fulvic acid was most dominant with around 30% of TOC, and then followed by O.alkyl (22.2.28.4%), Alkyl (13.2.20.1%), and carboxyl OC groups (9.2.19.4%). Conclusively, the mineralogical effect of BA might be a main factor on accumulating SOM in BA mixed soil layer.
방파제 연계형 파력발전시스템을 위한 전력변환장치에 대한 연구
은득룡(Deuck-Lyong Eun),김재혁(Jaehuck Kim),김경환(Kyong-Hwan Kim),김길원(GilWon Kim),홍기용(Key Yong Hong) 대한전기학회 2017 대한전기학회 학술대회 논문집 Vol.2017 No.4
방파제 연계형 파력발전 시스템은 진동수주형 공기실, 터빈, 발전기 및 전력변환장치로 구성되어 있으며 이중 전력변환장치는 불규칙하게 변하는 파도의 운동에너지를 전기에너지로의 안정적인 변환을 위하여 발전기를 제어하고 계통에 연계를 하는 중요한 역할을 수행한다. 이러한 전력변환장치는 발전기의 출력인 3상 교류전압을 직류로 변환하는 정류기와 이를 다시 계통이 요구하는 주파수와 크기의 교류전압으로 변한시키는 인버터로 구성된다. 본 논문에서는 방파제 연계형 파력발전 시스템을 위한 전력변환장치의 토폴로지를 제시하고, 전력변환기의 동작 특성을 이해하기 위해 파력발전기용 영구자석 동기발전기와 전력변환장치의 수학적 모델링을 구축하여 시뮬레이션을 수행하고자 한다.