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최동권(Dongkwon Choi),한가람(Karam Han),김정면(JeongMyeon Kim),최병선(ByeongSeon Choi),송승헌(Seungheon Song),우주희(Joohee Woo),이욱륜(Wookryun Lee) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
As power generation methods based on renewable energy are distributed, the development of flexible operation technologies for existing thermal power generation is emerging. During flexible operation, life time reduction due to combustion instability and thermal fatigue is predicted and sufficient research is needed. In this study, the combustion according to the shape information of the boiler nozzle tip is analyzed, and the combustion point is analyzed by the thickness of the nozzle tip into two stage.
A study on coalbed methane gas contents estimation of the coal mine in Mongolia
정지훈,권순일,Dongkwon Han,Seungrok Lee 한국자원공학회 2013 Geosystem engineering Vol.16 No.3
This study presents both theoretical and experimental calculations for the amount of desorbed gas, lost gas, and residual gas from the coal core and gas composition analysis in order to measure the coalbed methane content of the studied coal mine in Mongolia. Three wells (1, 2, and 3) were studied, and the results from well 3 were analyzed. The amount of desorbed gas was measured to be 6.740 scf/ton in sample 7. The amount of lost gas was calculated using the direct method and the maximum amount calculated from sample 1 was 0.986 scf/ton. After crushing the sample to ,60 mesh and measuring four samples, the average crushing rate was approximately 71% and no residual gas was detected. Gas composition analysis showed that although methane gas was detected in almost all samples, the amount was only 1.17% in average, whereas nitrogen was detected with an average of 85.29% and with a small amount of carbon dioxide.
저부하 운전 시 절탄기 바이패스 적용에 따른 석탄화력발전소 성능 예측
최병선(Byeongseon Choi),한가람(Karam Han),김정면(Jeong-Myun Kim),최동권(Dongkwon Choi),이욱륜(Wook-Ryun Lee) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
As the amount of renewable energy generation increases, flexible resources are needed to stably operate the power system. Coal-fired power plants also need to improve their flexibility in order to contribute to stabilizing the power system, such as lowering the minimum load, increasing the ramp rate, and reducing the start-up time. However, as the Selective Catalytic Reduction(SCR) inlet gas temperature decreases during low-load operation, the denitrification efficiency decreases and a large amount of nitrogen oxide is discharged into the atmosphere. In this study, the SCR inlet temperature was maintained above 300°C by applying the economizer bypass to maintain high catalyst activity at low-load, and then the performance of the coal-fired power plant was predicted. When the economizer bypass is applied, the amount of heat supplied to the economizer is reduced and water cannot be sufficiently heated, so additional fuel is required, which increases the heat rate.