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배열회수보일러 케이싱 파손방지를 위한 열응력 저감 Heat Sink 설치 효과
최석민(Seok Min Choi),김선호(Seon Ho Kim),김풍일(Poongil Kim),고석재(Seok Jae Ko),정희봉(Hee Bong Chung),한봉기(Bong Gi Han),조형희(Hyung Hee Cho) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
This study investigate thermal stress on the HRSG casing adopting heat sink by experimental data and numerical simulation. Heat sink is adopted on the HRSG casing to reduce the thermal stress. Thermocouples are installed on the operating HRSG casing to measure the temperature. Measured data shows that temperature gradient is rapid on the middle section of the HRSG casing. On the middle section, the temperature gradient is average 100℃ and it will cause extreme thermal stress. By numerical simulation we found out the local temperature data and measeared the thermal stress on the HRSG casing. Thermal stress on the middle section of HRSG casing is the highest and we can easily assume that the breakages are frequently happens on that position. So, we installed the heat sink on the vulnerable position on the HRSG casing to reduce the thermal stress. By installing the heat sink, we can reduce the peak thermal stress by 10% on the vulnerable position. As a result, heat sink can reduce the thermal stress on the HRSG casing.
배열회수 보일러 스택에서 선회유동 효과에 따른 집진기 성능 특성
임준수(Joon-Soo Lim),최석민(Seok Min Choi),문호규(Hokyu Moon),김풍일(Poongil Kim),한봉기(Bong Gi Han),조형희(Hyung Hee Cho) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
Axial cyclone for precipitating the oxide iron in HRSG stack is devised in this study. Numerical simulation is performed to evaluate pressure drop between inlet with outlet of HRSG stack and performance of axial cyclone precipitator. RSM turbulence model is used for calculation because of its good validity with swirl flow. As a result, pressure drop is increased as angle of guide vain is decreased. However performance factor of precipitator which determined from swirl number has maximum point when the angle of guide vain is 40 degree.