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SNG 생산용 공기분리공정의 공기 재 압축비에 따른 민감도 분석
김미영,주용진,서동균,신주곤,Kim, Mi-yeong,Joo, Yong-Jin,Seo, Dong Kyun,Shin, Jugon 한국전력공사 2019 KEPCO Journal on electric power and energy Vol.5 No.3
심랭식 공기분리공정은 공기를 액화시켜 질소와 산소, 아르곤 등 다양한 산업가스를 생산하며, 가스생산조건(순도, 종류)에 따라 공정 또한 달라진다. 그 중 SNG 플랜트 공급용 공기분리공정은 99.5% 이상의 초고순도 산소 생산을 요구하기 때문에 공정의 효율이 타 공기분리공정에 비해 떨어지며, 공정효율을 낮추는 요인에는 공기압축에 의한 소모동력이 대표적이다. 본 연구에서는 SNG 플랜트에 적용하는 공기분리공정의 에너지 효율 향상을 위하여 소모동력과 관련된 공기 압축 설비의 민감도 분석을 수행하였다. 민감도 분석을 위해 ASPEN PLUS를 이용해 공기분리공정을 모사하였다. 모사 결과, 99.5% 이상의 산소 18.21 kg/s를 생산하였으며, 33.26 MW의 동력이 소모되었다. 모사된 공정 중 공기압축설비는 주 압축기 1대와 2대의 재 압축기가 있으며, 2대의 재압축기에서의 공기압축비 변화에 따른 고압질소, 저압산소, 저압질소의 유량과 순도에 대한 영향과 공정 내 소모동력 변화에 대해 분석하였다. 분석 결과, 99.5% 산소, 99% 질소(고압), 90% 질소(저압)를 생산하기 위한 최적의 운전조건은 재압축비가 각각 0.48, 0.50가 되었으며, 재압축비 조정 후 $0.507kWh/O_2kg$에서 $0.473kWh/O_2kg$으로 소모동력도 약 7%가량 줄었음을 확인하였다. Cryogenic air separation unit produces various gases such as $N_2$, $O_2$, and Ar by liquefying air. The process also varies with diverse production conditions. The one for SNG production among them has lower efficiency compared to other air separation unit because it requires ultrapure $O_2$ with purity not lower than 99.5%. Among factors that reduce the efficiency of air separation unit, power consumption due to compress air and heat duty of double column were representatives. In this study, simulation of the air separation unit for SNG production was carry out by using ASEPN PLUS. In the results of the simulation, 18.21 kg/s of at least 99.5% pure $O_2$ was produced and 33.26 MW of power was consumed. To improve the energy efficiency of air separation unit for SNG production, the sensitivity analysis for power consumption, purities and flow rate of $N_2$, $O_2$ production in the air separation unit was performed by change of air boosting ratios. The simulated model has three types of air with different pressure levels and two air boosting ratio. The air boosting ratio means flow rate ratio of air by recompressing in the process. As increasing the first air boosting ratio, $N_2$ flow rate which has purity of 99.9 mol% over increase and $O_2$ flow rate and purity decrease. As increasing the second air boosting ratio, $N_2$ flow rate which has purity of 99.9 mol% over decreases and $O_2$ flow rate increases but the purity of $O_2$ decreases. In addition, power consumption of compressing to increase in the two cases but results of heat duty in double column were different. The heat duty in double column decreases as increasing the first air boosting ratio but increases as increasing the second air boosting ratio. According to the results of the sensitivity analysis, the optimum air boosting ratios were 0.48 and 0.50 respectively and after adjusting the air boosting ratios, power consumption decreased by approximately 7% from $0.51kWh/O_2kg$ to $0.47kWh/O_2kg$.
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김미영(Kim Mi Yeong) 한국현대소설학회 2004 현대소설연구 Vol.- No.21
In the 19th century, some of the foreign evangelists came to Cho-Sun. First of all, the foreign evangelists had engaged in Christian mission to the Korean women indirectly, as usually as with educations and medical services. Korean women`s general reaction to the Christianity was positive because of the principal of equality brought with the new religious idea. This is why most of the leaders of Cho-Sun`s women were Christians. The concept of New Women was made in the early 1920`s in Korea after being imported by the young Korean intellectuals studied in Japan. The first generation of Korean women writers and leaders of new women group are Rha Hae Seuk. Kim I1 Yup. and Kim Myeung Soon, all of whom studied abroad. The New Women meant the educated women and the modernized ladies. Most of the New Women at that time were Christians. That is why the Christianity and the New Women has a very close relationship. They both stand for the principle of educational equality for men and women. Rha Hae Seuk, Kim I1 Yup. Kim Myeung Soon also were Christians. Their works of literature and their lives were based on Christianity in their early writing days. However, as time went by. their beliefs turned into another religion, ana they converted usually into the Buddhism. There are three reasons for their conversions. The first thing was the Confucian patriarchal system of Korean traditional culture. The second was their superficial understanding of the Christianity. The last reason was the egocentrism of the New Women`s discourses and thoughts. Christianity is diametrically opposite to egocentrism and Confucian patriarchal value system. The more they kept away from the Christianity. the more their lives and literal works become careless and complicated.
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김미영 ( Mi Yeong Kim ),김재관 ( Jae Kwan Kim ),이현동 ( Hyun Dong Lee ),김성철 ( Sung Chul Kim ) 한국공업화학회 2009 응용화학 Vol.13 No.1
Nowadays, environmental problem becomes more important and many countries are interested in treating wastes. Many researches are studied environmental and economic treatment of wastes according to need. Handling sewage sludge which is disposed in ocean is also come into the spotlight. There are many methods for handling sewage sludge except ocean disposal, but this paper was studied about effective combustion as fuel for coal-fired power plant. The amount of sewage sludge is very small instead of coal. So sewage sludge must be combust with coal. Therefore This study estimated combustion characters and pyrolysis behavior for sewage sludge-coal mixture using TG in order to satisfy fuel condition in power plant.
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김미영(Mi Yeong Kim) 철학연구회 2014 哲學硏究 Vol.0 No.106
Today Confucianism is located in an intersection where the love and the hatred are crossed in that it is an alternative value as well as a target of overcoming. Particularly, the criticism of family egoism salient to comments of Confucianism began to be expressed as Western thought flowed into East Asia, because of the position that a family as a private domain is separated from a nation as a public one. Now, investigating the ideas of Confucian family from a woman viewpoint, I will try to approach Confucian values posed as alternative ones in this contemporary society, by revealing discrepancy between the family values projected in the argument of Confucian patriarchalism emerging in the modern period and Confucian values. Thereby I will disclose the social phenomenon making virtuous women appear in the later Chosun through the ideas of Confucian family. For this, first I will present the point that in what is regarded as the ideas of Confucian family is the conventional viewpoint on a family prior to its contact to Western civilization mixed with the perspective on a family established upon the modern law system as a result of debates developed as Western civilization flowed into East Asia before and after the 20th century. Besides, in 1910s Max Weber was a help in Confucian society being regarded as a stagnant one by spreading Confucian patriarchalism by way of connecting Confucianism with Western way of patriarchalism. However, if this kind of patriarchalism were accepted, it would be difficult to explain the social phenomenon bringing out virtuous women in the later Chosun. Therefore, I will have a new understanding of Confucian values blocked out by the modern ideas of family based on the values of filial piety, by revaluating the discourses on virtuous people or unvirtuous ones, and explain the social phenomenon through which virtuous women appeared by the ideas of Confucian family.
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