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안태휘,이찬영,황재욱,남지영,서명원 한국환경에너지공학회 2023 한국열환경공학회 학술대회지 Vol.2023 No.1
Recently, gasification is one of the most important technology in terms of resource recycling of wastes. Sewage sludge occurs from the sewage treatment process, and the sludge treatment process is required before disposal to decrease the amount of landfills. The efficiency of the sewage treatment process could be increased through the sludge gasification process. This study aims to investigate the air gasification characteristics of sewage sludge using a 1 kg/h laboratory—scale bubbling fluidized bed gasifier. The syngas composition was 3.2 vol% of hydrogen, 5.4 vol% of carbon monoxide, 3.3 vol% of methane, and 2.8 vol% of hydrocarbons.(C₂ - C₃). The carbon conversion efficiency and cold gas efficiency of the gasifier are compared with previous study. This study provides basic data on sewage sludge gasification for useful syngas.
안태휘 ( Tae Hwi An ),서명원 ( Myung Won Seo ) 한국공업화학회 2023 공업화학전망 Vol.26 No.6
Power-to-Methane (PtM) technology is a multi-stage process where H<sub>2</sub> is first produced by water electrolysis, which subsequently reacts with CO<sub>2</sub> to produce green methane. This process not only offers a promising pathway for the energy saving, but enables CO<sub>2</sub> utilization. In this short review, we briefly summarize recent research and development trends through catalyst development, improvement of reaction conditions, reactor type, and new concept proposal. Following the status of recent PtM projects around the world, we introduce domestic PtM status including the strategic roadmap for SMEs (Small and medium enterprises) and suggest perspective of PtM technology for CO<sub>2</sub> utilization.
윤성민,이석형,안태휘,서명원,이상원,김대성,문태영,박성진,윤상준,문지홍,이재구,주종훈,라호원,Sung Min Yoon,Seok Hyeong Lee,Tae Hwi An,Myung Won Seo,Sang Won Lee,Dae Sung Kim,Tae-Young Mun,Sung Jin Park,Sang Jun Yoon,Ji Hong Moon,Jae Goo Lee 한국청정기술학회 2023 청정기술 Vol.29 No.4
세계적으로 석탄은 다른 에너지원에 비해 매장량이 풍부하여 다양한 에너지원으로 사용되고 있다. 기존 석탄 이용 방식에서 발생하는 환경적인 문제를 해결하기 위해 청정 석탄 활용 기술 개발이 이루어지고 있으며 대표적인 기술로 IGCC발전 기술이 있다. IGCC 발전에서 사용되는 석탄은 CMD 공정에서 열풍을 동시에 공급하여 건조, 분쇄가 이루어지고 있으나, 공급되는 열풍의 온도가 너무 높을 경우, 탈휘발, 자연발화 현상이 발생하게 되고 이로 인한 CMD 공정의 안정적인 운전을 저하시킨다. 본 연구에서는 유연탄 9종을 이용하여 탈휘발, 자연발화 개시온도를 측정하고 석탄 특성분석결과와 함께 상관관계를 알아보고자 하였다. 탈휘발 현상의 경우 350 ~ 400 ℃ 사이에서 6종 석탄의 탈휘발이 확인되었고 400 ℃ 이상의 온도에서 3종의 석탄 탈휘발을 확인하였다. 자연발화의 경우 100 ℃ 이하에서 1종의 석탄, 100 ~ 150 ℃ 사이에서 6종의 석탄, 150 ℃ 이상에서 2종 석탄의 자연발화를 확인하였다. 측정한 개시온도를 석탄 분석 결과 중 Oxygen, Moisture, Fe<sub>2</sub>O<sub>3</sub>, CaO, H/C Ratio, O/C Ratio와 비교하여 상관관계를 확인하였다. 회귀분석으로 각 개시온도의 회귀계수와 결정계수를 계산하였으며, FC/VM 데이터의 52.44%가 탈휘발 개시온도에 대해, Fe<sub>2</sub>O<sub>3</sub> 데이터의 59.10%가 자연발화 개시온도에 대해 영향을 주는 것에 대한 유의한 결과를 확인 하였다. Coal is abundantly available compared to other energy sources and is used as a versatile energy resource worldwide. To address the environmental issues stemming from conventional coal utilization, efforts are underway to develop clean coal utilization technologies, with IGCC technology being a notable example. In IGCC plants, coal is subjected to a CMD process where both drying and pulverization are achieved by supplying hot air. However, if the temperature of the supplied hot air is excessively high, it can lead to devolatilization and spontaneous combustion, thereby compromising the stable operation of the CMD process. This study aimed to measure the devolatilization and spontaneous combustion temperatures of different types of bituminous coal, and to explore their correlations with the characteristics of the coals. Six coal types exhibited devolatilization between 350 and 400 ℃, while three coal types showed devolatilization at temperatures exceeding 400 ℃. Spontaneous combustion ℃curred in one coal type below 100 ℃, six coal types between 100 and 150 ℃, and two coal types above 150 ℃. The measured initiation temperatures were compared with the coal characteristics including the oxygen, moisture, Fe<sub>2</sub>O<sub>3</sub>, and CaO content, the H/C ratio, and the O/C ratio to establish correlations. Regression analysis was used to calculate the regression coefficients and determination coefficients for each ignition temperature. It was found that 52.44% of the FC/VM data significantly influenced the volatile matter ignition temperature, and 59.10% of the Fe<sub>2</sub>O<sub>3</sub> data significantly affected the spontaneous combustionignition temperature.