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RISS 인기검색어
- 검색키워드
- 저자 : Yongseung Yun (검색결과 52 건)
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Gasification of an Indonesian subbituminous coal in a pilot-scale coal gasification system
Yongseung Yun,Seok Woo Chung 한국화학공학회 2007 Korean Journal of Chemical Engineering Vol.24 No.4
and the produced syngas was purified with hot gas filtering and by low temperature desulfurization to the quality thatcan be utilized as a feedstock for chemical conversion. Roto midle coal produced syngas that has a typical com-position of 36-38% CO, 14-16% H2, and 5-8% CO2. Particulates in syngas were 99.8% removed by metal filters atthe operating temperature condition of 200-250oC. Sulfur containing compounds of H2S and COS in syngas were alsodesulfurized in the Fe chelate system to yield less than 0.5 ppm level. The full stream gasification and syngas purifyingto chemicals like DME and on the future IGFC using fuel cells.
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Yun, Yongseung,Ju, Ji Sun 한국화학공학회 2003 Korean Journal of Chemical Engineering Vol.20 No.6
A gasificatiodmelting facility that can operate up to 10 bar and 1,550℃ with a maximum 1 ton/day capacity was developed for liquid and slurry-type combustible wastes. The main focus of the system development was minimal use of expensive fuel for maintaining the reaction temperam hy replacing it with cheap waste oil for energy input. The carbon conversion obtained was 97% while the cold ga. efticiency reached 77.6% for the refined waste oil. When the feed way refined oil mixed with fly ash from a municipal waste incinerator, the carbon conversion and cold gas efficiency were 93% and 71.99'0, respectively, with a slag conversion ratio of 0.93. The slag produced from fly ash exhibited environmentally acceptable heavy-metal leaching values and thus can be applicable as road material and for other purposes. The optimal O₂/feed ratio was 0.9-1.0 when only the refined waste oil was gasified, whereas the O₂/feed ratio had to be higher than 1.2 when fly ash was mixed. In addition, data showed that gasifier temperature can he estimated by on-line methane concentration measurements.
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Comparison of Syngas and Slag from Three Different Scale Gasifiers using Australian Drayton Coal
Yun, Yongseung,Yoo, Young Don 한국공업화학회 2005 Journal of Industrial and Engineering Chemistry Vol.11 No.2
Syngas composition, conversion efficiencies in gasification, and slag characteristics were compared for the data from three different gasification systems with the same seam of Australian Drayton coal. Particularly, data on the syngas composition and conversion efficiencies from the 1 ton/day (T/D) gasifier in Korea were compared with published data from Shell gasification systems of 150 T/D pilot plants as well as from Shell commercial plants of 1890 T/D scale. In addition, the shape and inner structure of slags obtained from the 1 T/D and a commercial-scale gasifier were compared to identify any gasifier-size effects. Cold gas efficiency showed a decreasing trend with smaller size gasifier while the carbon conversion was similarly more than 98% for all size gasifiers. Slags from different size gasifiers exhibited a similar size and also the same indication of forming vesicular voids inside the structure. The results illustrate that the coal gasification performance can be realistically estimated even with a far smaller scale system.
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Operation characteristics of 1 ton/day-scale coal gasifier with additional stage
Yongseung Yun,Seung Jong Lee,Jin-Pyo Hong 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.5
A one-stage coal gasifier was modified to accommodate the two stages of coal feeding. Operating characteristics were compared between the one-stage and two-stage gasification in terms of syngas composition, carbon conversion,shape and inner structure of produced slags, characteristics of particle size distribution in entrained fines, and effects on particulate removal facilities. Temperature at the second stage of the gasifier resulted in lower values, which confirms the performance of the second stage as a reduction area by endothermic reactions. The results suggest that the 10-20% increase in coal feeding to the second stage might not cause much loss in carbon conversion. Produced slag and the performance of metal filters and water scrubber were similar with the earlier results from one-stage gasification tests. The two-stage gasification appears to help in increasing the cold gas efficiency for the certain operating range. Two-stage gasification had an impact on the 0.1-1 μm size of entrained fines, which appear to be cenospheres that occur during the rapid quenching in temperature.
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Are Asian Business Cycles Different?
Yongseung Jung,Soyoung Kim,Doo Yong Yang,Tack Yun 대외경제정책연구원(KIEP) 2011 Working Papers Vol.2011 No.1
본 논문은 아시아의 비즈니스 사이클을 분석하고자 한다. 일반적으로 소규모 개발도상국의 비즈니스 사이클은 소규모 선진국과는 다른 것으로 알려져 왔다. 가장 흥미로운 것은 개도국 비즈니스 사이클에서 나타나는 지나친 소비 변동성과 두드러진 순수출의 반순환적 특성이다. 아시아와 라틴 국가들에서 이러한 특성이 어느 정도 공통적으로 나타난다. 그러나 아시아의 비즈니스 사이클 특성은 라틴 아메리카 국가들과는 다르다. 아시아의 경우 소비 변동성이 라틴 개도국과는 다르게 상대적으로 작게 나타난다. 그러나 순수출의 반순환적 특성은 라틴 국가에 비해 강하다. 한편 내구재 변동성은 상대적으로 개도국에서 높게 나타나는데 라틴 국가와 아시아 개도국에서 이러한 높은 내구재 변동성을 발견하였다. 흥미로운 것은 내구재 소비와 순수출의 상관관계가 아시아(한국)에서는 부의 관계를 보이는 반면, 라틴에서는 정의 관계를 보인다는 것이다. 수출과 수입을 따로 나누어 상관관계를 살펴보아도 아시아와 라틴의 경우가 서로 다르게 나타난다. 결론적으로 아시아와 라틴 개도국은 소비, 순수출 그리고 수출입을 연결하는 전송 메커니즘이 다르다고 할 수 있다. 이를 기초로 교역조건이 주요 거시경제에 미치는 영향을 Vector Auto-regression (VAR)을 통해 분석하였는데, 라틴 개도국의 경우에는 긍정적인 교역조건 충격이 실질 총생산에 긍정적인 영향을 미치는 반면, 아시아 개도국의 경우에는 실질 총생산에 별 영향이 없었다. 그러나 아시아의 경우 교역조건 충격은 라틴 개도국에 비해 상대적으로 순수출에 단기적으로 지속적이고 강한 영향을 미치는 것으로 나타났다. 본 논문은 이러한 분석을 바탕으로 아시아(한국)의 내구재 비즈니스 사이클 모형을 제시하고 있다. 이 모형은 내구재 소비를 통해 아시아 경기 변동을 보다 잘 설명할 수 있음을 보여준다. This paper investigates business cycles in Asia. Business cycles in developing small, open countries are different from those in developed small countries. Most interesting characteristics in developing countries are excessive consumption volatilities and strong countercyclical net export. Asia and Latin American developing countries share these characteristics. However, there are also differences in business cycles in both regions. We find that Asia shows less excessive consumption expenditure volatility to output than Latin American countries, and strong countercyclical net exports. More interestingly, the durable consumption is negatively related with net export in Asia (Korea), while Latin America (Chile) shows positive correlation. Moreover durable consumption shows a negative relationship with export and import while durable consumption in Latin America has positive relationship with export and import. We believe that there exist different transmission mechanisms in Latin America and Asia that connect consumption, net exports and export or import. We find that positive terms of trade shock increase the real GDP significantly in the short run for Latin America, but have no significant effects for East Asia. However, response of net exports to the terms of trade shocks is stronger and more persistent in Asia than in Latin America. This paper also present an analytic model that could explain the durable goods business cycles in Asia. The model can explain durable business cycles in Asia (Korea) which generate strong procyclical durable consumption by the export-income channel with market laddering.
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