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신연료 DME의 복합화력발전소 적용을 위한 연소성능시험
이민철(Min Chul Lee),서석빈(Seok Bin Seo),정재화(Jae Hwa Jung),안달홍(Dal Hong Ahn) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Recently, DME(Dimethyl Ether, CH3OCH3) has highly attracted attention as an alternative fuel because of its easy transportation and clean characteristics. This study was conducted to verify the combustion performance and to find troubles when DME is fuelled to a gas turbine. Combustion tests were conducted by comparing DME with methane, which is a main component of natural gas, in aspects of combustion instability, NOx and CO emission and the outlet temperature of combustion chamber. The results of performance tests show that DME is a very clean but hard to control. CO emission level of DME is lower than that of methane and NOx emission level of DME is as low as that of methane. When firing DME, the pressure fluctuation in combustion chamber caused by combustion instability is lower than that of firing methane. From the result of outlet temperature, we can get DME is easy to flash back, and this property should be considered when operating a gas turbine and designing a burner.
모델 가스터빈 연소기에서 합성가스 연소성능시험 - Part 2
이민철(Min Chul Lee),윤지수(Jisu Yoon),주성필(Seong Pil Joo),윤영빈(Youngbin Yoon) 한국항공우주학회 2013 韓國航空宇宙學會誌 Vol.41 No.8
본 논문은 부게넘 및 태안 IGCC플랜트의 연료를 대상으로 석탄으로부터 생성된 합성가스의 NOx/CO배출 특성, 온도특성, 화염의 구조에 대해 기술하였다. GE7EA 모사 가스터빈 연소기를 대상으로 상압 고온 연소시험을 수행하여 입열량 및 질소희석에 따른 연소특성을 관찰하였다. 입열량이 감소하고, 희석제량이 증가할 때 단열화염온도의 감소로 NOx가 감소하였고, 저부하에서는 희석량이 증가할수록 불완전 연소로 인해 CO가 증가하였다. 이러한 NOx 감소 및 CO발생은 각각 1500 ℃ 와 1250 ℃의 특정 화염온도에서 관찰되었다. 또한 질소 희석이 증가할수록 단열화염온도 및 연소기 라이너의 온도가 감소했고, 화염 부상과 같은 화염구조의 변화로 인해 특이점이 관찰되었다. 본 연구결과를 통해 질소희석이 NOx/CO배출 및 온도, 화염구조에 미치는 영향이 검토되었으며, 시험 데이터는 향후 태안 IGCC 플랜트의 운전시 최적 조건 선정을 위한 기초자료로 활용될 예정이다. This paper describes on the NOx/CO emission characteristics, temperature characteristics and flame structures when firing coal derived synthetic gas especially for gases of Buggenum and Taean IGCC. These combustion characteristics were observed by conducting ambient-pressure elevated-temperature combustion tests in GE7EA model combustor when varying heat input and nitrogen dilution ratio. Nitrogen addition caused decrement in adiabatic flame temperature, thus resulting in the NOx reduction. At low heat input condition, nitrogen dilution raised the CO emission dramatically due to incomplete combustion. These NOx reduction and CO arising phenomena were observed at certain flame temperature of 1500 ℃ and 1250 ℃, respectively. As increasing nitrogen dilution, adiabatic flame temperature and combustor liner temperature were decreased and singular points were detected due to change in flame structure such as flame lifting. From the results, the effect of nitrogen dilution on the NOx/CO and flame structure was examined, and the test data will be utilized as a reference to achieve optimal operating condition of the Taean IGCC demonstration plant.
Preparation of carbon aerogel derived from resorcinol-formaldehyde for electrode materials
이민철,홍창국 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
Carbon aerogels were prepared by polycondensation of resorcinol with formaldehyde using sodium carbonate as a catalyst in ambient conditions, and they were used as an electrode of electrical double-layer capacitor. As a general trend, the ability of the electrodes to electrosorb ions depended on the microporosity, whereas the large pores (mesopores) had a strong influence on the kinetics of the electrosorption process. In this paper, the effect of resorcinol to catalyst ratio (R/C ratio) on pore size distribution, BET surface area, and electrochemical property of carbon aerogels was investigated by changing R/C ratio from 500 to 1500. In order to minimize volume shrinkage, solvent exchange was performed with acetone at 50°C for 5 day. Carbon aerogel prepared at R/C ratio of 800 showed the highest BET surface area with average pore diameter of 7.9 nm. The morphology of carbon aerogel was investigated using SEM. The surface area and pore size were measured by BET.
단일약국과 다약국 프로그램에서 수행한 지역약국 필수실무실습에 대한 평가
이민철,조민휘,정영준,이지영,윤현옥 한국임상약학회 2014 한국임상약학회지 Vol.24 No.4
Background: The first pharmacy student practice undergoing 6 year pharmacy school curriculum have begun in thehospital pharmacy, community pharmacy, pharmaceutical company and administrative office since 2013. Although mostof practice sites have prepared the program of pharmacy student practice education for several years under guideline ofKorean Association of Pharmacy Education, generally community pharmacies which start the pharmacy student practiceeducation have difficulty in performing the desirable student practice program due to absent experience for it. Sowe reported the comparison of student practice programs between mono pharmacy and multiple pharmacies conductedby Gyeongsang National University College of Pharmacy to provide the future design information of the ideal pharmacystudent practice in community pharmacy. Method: Students who practiced both multiple (multi) and mono pharmacy(mono) programs for each 5 weeks were participated the survey to evaluate the student practice programs. Results: The results of the survey on the student practice program reported that students were much more satisfied with themultiple pharmacies program than mono pharmacy program in both practical contents (4.12± 0.72 : 3.27±1.28; multi : mono)and satisfaction (4.54±0.54 : 3.54±1.3; multi : mono) and they all gave the highest points (5.00±0.00) to multiple pharmaciesprogram for recommendation because the multiple pharmacies program was significantly helpful for their experienceto plan the future career. Conclusion: Mono and multiple pharmacy practice programs would be a great helpfulfor student’s future career. However, the disadvantages of each program should be amended gradually for the unifiedand specialized program to be established the ideal community pharmacy student practice in Korea. The results will beaffected the pharmacy practice program for students in community pharmacy and the other colleges of pharmacy todesign the ideal community pharmacy practice program.
Intercalation of graphene oxide in functionalized bio-based composite materials from soybean oils
이민철,홍창국 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
The Bio based resin is renewable and inexpensive natural materials to replace the petroleum based polymers. Graphene has attracted significant attention recent years. Because Ideal structured graphene has better properties than conventional filler materials for polymer composites. Chemical oxidation is effective method for mass production of graphene. Graphene oxide(GO) is an useful intermediate in chemical oxidation method. GO contains several functional groups such as hydroxyl, carboxyl, and epoxy groups. Therefore, GO can be well dispersed in water due to its hydrophilic properties. Acrylated epoxided soybean oil was introduced hydrophilic functionality through malenization reaction. Maleization reaction was confirmed by FT-IR. It is important reaction for intercalation of GO in resin. The interlayer of GO was measured through X-ray diffraction (XRD). Graphene-filled polymer composites was confirmed by TEM. Mechanical property of Graphene-filled polymer composites was enhanced by increasing the interlayer of GO in resin.