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조한창(Han Chang Cho),오혁진(Hyuk Jin Oh) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.42
An experimental study was carried out in a heat treatment furnace to investigate the performance, such as NOx emission, enhancement of heat transfer, system stabilization and etc, of oscillating combustion applied in multi radiant tube burner system. A oscillating controller with solenoid valve were designed and used to control 20 valves. In a test furnace with one burner, NOx emission decreases by 40~50 % in 2.0㎐ and duty ratio 30%. As oscillating combustion was applied in radiant tube burner system, it is found that NOx emission, compared to no oscillation, could be reduced by 20~30% at 2.5㎐ without CO emission. However, as oscillating frequency was increased, effect of abatement of NOx emission is gradually reduced. From the measurement of furnace heating time from 100℃ to 900℃, heat transfer is increased by 4.0% at the oscillation of 2㎐. Temperature distribution of radiant tube surface is more uniform at oscillation of 2㎐ with decrease of the peak temperature and increase of low temperature. From these results, it is confirmed that oscillating combustion is useful in radiant tube burner system.
제철 부생가스를 이용한 복사관 버너에서 맥동연소기술 적용특성 파악
오혁진(Hyuk Jin Oh),조한창(Han Chang Cho),조길원(Kil Won Cho) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.40
An experiment study has been performed to evaluate the feasibility of the oscillating combustion technology in a real-scale (100,000 ㎉/h) radiant tube burner system using a by-product gas in iron-and-steelmaking processes. The evaluation is accomplished by analyses of NOx reduction, enhancement of heat transfer, and achievement of complete combustion. The oscillating control system equipped with a commercialized solenoid valve is designed and used. Three radiant tube burners using coke-oven-gas (COG) are tested. The results shows heat transfer is increased by 16.5% (max.), thus it can be expected to save energy, enhance a lifetime of radiant tubes, and increase heat efficiency. The optimum operating condition for each burner is found because the combustion characteristics of the burners are different. With the conventional burner 3, 46% of NOx reduction is achieved and CO emission is not detected, which confirms oscillating combustion is very useful in radiant tube burner system.
한미동맹과 조중동맹의 제도화 경로: 국가형성기 국면별 접근을 중심으로
조혁진 ( Hyuk Jin Cho ) 조선대학교 동북아연구소(구 통일문제연구소) 2015 동북아연구 Vol.30 No.1
이 연구는 남한과 북한의 국가형성기 한미동맹과 조중동맹의 제도화 경로를 분석한다. 2015년 현재 각각 62년, 54년째 지속되어오고 있는 한미동맹과 조중동맹은 한반도와 동북아 지역질서를 틀 지우고 있다. 이 연구는 남한과 북한이 ``내부적 국가형성``과 ``외부적 국제관계``에 따라 서로 다른 동맹의 제도화 경로를 경험해왔음을 밝힌다. 이를 위해 이 연구는 남한과 북한의 국가형성기와 전쟁 전후의 결정적 국면을 중심으로 분석하면서, 동맹의 제도화에 촉진 또는 지체 요소로 작용했던 국가 외부적 배열구조로서의 동북아 지역질서에 대해 분석한다. 이를 통해 이 연구는 한미동맹과 조중동맹의 제도화는 남한과 북한의 국가 성격에 중요한 영향을 미쳤으며, 서로를 적대시 하는 동맹의 존재는 동북아 지역 통합 및 협력에 지체요소로 작용하고 있음을 지적한다. This study analyzes the path to the institutionalization of the alliance in the two Koreas`` state formation processes after liberation from the Japanese colonial rule. The ROK-US and DPRK-PRC alliances, both still in effect, have formed the regional order around Northeast Asia. This paper argues that the ROK and DPRK institutionalized their alliances in different models of "internal state formation" and "external relationship." Firstly, this paper explains the critical junctures of internal state formation of the two Koreas, the establishments of divided governments, the Korean War, the processes of state builders`` consolidation of their power during and after the war. Secondly, this paper analyzes the external ordering of the states around the Korean Peninsula as the external relationship structure and the influence of this ordering on the paths to institutionalization of the alliances. Regarding the implications of the alliances, it points out that South Korea became dependent on the US and North Korea started to carry its multilateral policy. At the regional level, the continuation of the alliances has intensified the regional division and it functions as an obstacle to Northeast Asian regional integration and cooperation.
맥동연소기술을 적용한 산업용 복사관 버너시스템의 특성 평가
오혁진(Hyuk Jin Oh),조한창(Han Chang Cho),조길원(Kil Won Cho) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.5
맥동연소기술을 적용한 산업용 복사관버너의 연소특성을 살펴보기 위해 실규모 (120,000 ㎉/h) 산업용 복사관버너 설비를 사용하여 실험실 및 현장 테스트를 수행하였다. 제철부생가스를 사용하는 산업용 복사관버너의 3 가지 종류를 하나의 W 형 복사관이 장착된 실험설비에서 실험하였다. W 형 복사관이 다수 사용되는 대형 설비를 이용하여 장기운영 실험을 실시하였다. 맥동연소기술을 적용한 기실험설비들을 대상으로 성능향상 및 배가스조절 측면에서 다양한 실험조건으로 테스트를 진행 하였다. 맥동연소기술의 적용가능성 평가를 위해 NOx 저감 및 효율향상을 분석하였다. 맥동연소기술의 적용결과 에너지 절감, 복사관 수명 향상 및 생산성 향상 등이 얻어짐을 확인할 수 있었다. 최고의 성능 및 배가스 조절을 얻기 위한 최적의 운전조건이 각 버너별로 결정되었다. Combustion characteristics of industrial radiant tube (RT) burners with forced oscillating combustion technology are investigated using a real-scale (125,000 ㎉/h) industrial RT burner facility in both laboratory and field tests. Three different types of industrial RT burners using a by-product gas from the iron-and-steelmaking process are examined in a laboratory facility equipped with a W-type RT. During the field tests, an industrial RT burner is characterized in a large facility equipped with multiple RTs. Their performance and emission controls are investigated under diverse operating conditions. The feasibility of the forced oscillating combustion technology is evaluated by the extent of NOx reduction and the efficiency improvement. These improvements are able to save energy, extend the RT lifetime, and enhance productivity. The operating conditions that achieve the best performance and emission control for each RT burner are determined.
Hyuk Jin Oh(오혁진),Han Chang Cho(조한창),Kil Won Cho(조길원) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.41
The oscillating combustion technology using industrial radiant tube (RT) burner facilities is developed and applied for a heat treatment process. Combustion characteristics of a real-scale (125,000 ㎉/h) industrial RT burners applied the oscillating combustion are investigated in both laboratory and field tests. Various types of industrial RT burners using the coke oven gas (COG) obtained from an iron-and-steelmaking process are examined in the laboratory facility equipped with a single W-type RT. During the field tests, an industrial RT burner is characterized in the large facility equipped with multiple single-type RTs. The feasibility of the oscillating combustion technology is evaluated by NOx reductions, complete combustion, heat transfer enhancement, and efficiency improvement. The optimum operating conditions of each burner for achieving the best performance and emission control are determined. About 20 ∼ 30% of the NOx reductions and about 3 ∼ 4% of the energy saving can be achieved by the oscillating combustion technology. It is found that the improvements are able to save the energy, extend the RT's lifetime and enhance the productivity.