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산업용 버너에서의 LNG, LPG/Air 연소특성 비교연구
오창용(Changyong OH),성연모(Yonmo SUNG),김승태(Seungtae KIM),유승우 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
The influence of gaseous fuel type and load on flame characteristics was experimentally investigated in a 1.3 MWth reheating furnace burner. In this study, LNG, LPG, and LPG/Air were selected as fuel, and fuel loads were set to 15%, 30%, and 60% in order to study gas interchangeability. The experimental results showed that the fuel change shows minor effect on the flame appearance for different fuel load conditions. The flame straightness performance was degraded under 30% fuel load conditions. The flame straightness performance was improved by injection of the burner center air. Minimum 10% air was required to improve the flame straightness performance compared to without burner center air conditions.
오창용(Changyong Oh),임홍섭(Hongseop Im),김인수(Insu Kim) 한국신재생에너지학회 2014 신재생에너지 Vol.10 No.4
Non-used waste heat has recently been paid special attention due to several global warming regulation and energy cost rising. In this study, therefore, thermal energy storage system which uses a solid type heat media has been investigated about the possibility of heat accumulation and heat release for thermal energy storage system. 35kWh of bench-scale thermal storage system was used to investigate the characteristics of the solid type heat media. From the result, it is shown that a solid type heat media should be divided to supply constant heat to the customers side. It is also shown the flow direction should be considered to reduce temperature difference between top and bottom sides in the thermal storage system.
장병화(Byunghwa Jang),성연모(Yonmo Sung),오창용(Changyong Oh),김승태(Seungtae Kim),전유택(Yootaek Jeon) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Oscillating combustion characteristics was experimentally investigated to reduce NOx emissions and improve thermal efficiency in a 1MWth industrial burner for reheating furnaces. Natural gas was used as fuel. This study was carried out for a range of oscillating frequencies(1~5 Hz) and duty ratios(10%~40%). Furnace temperature and gas species concentrations were measured for with- and without oscillating flames. The NOx reduction efficiency for flames with oscillating combustion in comparison to flames without oscillating combustion increases with decreasing oscillating frequency and increasing duty ratio. The maximum NOx reduction efficiency was 32% in 1 Hz-40% oscillating flames. For the temperature measured at the furnace top-wall, the maximum temperature with oscillating flames was reduced at main flame regions, however, the overall temperature after main flame regions is higher than that of the flames without oscillating combustion.
조재영(Jaeyoung Cho),김광화(Kwanghwa Kim),오창용(Changyong Oh),박형준(Hyeongjun Park),전유택(Yootaek Jeon),송한호(Han Ho Song) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Hot blast stove is a heat regenerative plant, where by-product gas from the steel process is used to heat up the bulk body of chequerbrick, then hot blast is generated by blowing cold blast through the pre-heated chequerbrick. Since the composition of by-product fluctuates according to the steel process, it is important to control and suppress the effect of fuel composition for stable operation. In this regard, we developed an one-dimensional dynamic model for understanding the dynamic behavior of the hot blast stove. For this, we solved the compressible flow equation numerically, then modeled diffusion, friction, radiation and convection heat transfer. The computational result from the model was compared to the measurment from the real plant of Hyundai-steel in Dang-Jin Si, and found to be reliable around the typical operating point.