• 대한기계학회:학술대회논문집
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• 대한기계학회 2001년도 춘계학술대회논문집D
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• pp.828-833
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• 2001

In this study, an analysis tool to assess the susceptibility of steam generator tubes due to the flow-induced vibration was developed. The fluid-elastic instability analysis of the U-tube bundle for CE-type steam generator was accomplished. The effective mass distribution along the U-tube was obtained to calculate the natural frequency and dynamic mode shape. Finally, stability ratios for selected tubes are obtained.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2002년도 추계학술대회논문집
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• pp.921-926
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• 2002

In this study, we investigate the plugging effect on the CE type steam generator tube. The natural frequency and mode shape will be changed due to decrease of the effective mass distribution along the tube. We compared the variation of stability ratio for plugged tube with that for unplugged one. The natural frequency increased because of removing the cooling water inside the steam generator tube, but the stability ratio decreased inversely because of changing the vibrational model shape. We also investigated the turbulent excitation effect.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2002년도 추계학술대회논문초록집
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• pp.390.1-390
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• 2002

In this study, we investigate the plugging effect on the CE type steam generator tube. The natural frequency and mode shape will be changed due to decrease of the effective mass distribution along the tube. We compared the variation of stability ratio for plugged tube with that fur unplugged one. The natural frequency increased because of removing the cooling water inside the steam generator tube, but the stability ratio decreased inversely because of changing the vibrational mode shape. We also investigated the turbulent excitation effect.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2001년도 추계학술대회논문집 II
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• pp.1400-1405
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• 2001

In this study, an analysis program to assess the susceptibility of steam generator tubes due to the flow-induced vibration was developed. Analysis of fluid-elastic instability and random turbulence excitation for the U-tube bundle in CE-type steam generator was accomplished. The effective mass distribution along the U-tube was obtained to calculate the natural frequency and dynamic mode shape. Finally, stability ratios and rms vibration amplitude for selected tubes are obtained.

• 대한환경공학회지
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• 제39권6호
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• pp.325-331
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• 2017

Monoethanolamine (MEA)으로 함침한 ZSM5와 Molecular Sieve 13X (MS13X)에 대한 이산화탄소 흡착실험을 실시하였다. 이산화탄소 흡착효율은 U자관 컬럼 반응기를 사용하였으며 GC/TCD로 분석을 하였다. 흡착제별 흡착온도는 $30{\sim}80^{\circ}C$에서 흡착능을 평가하였다. 개질화된 흡착제의 표면특성을 알기 위해 BET분석, $N_2$ 흡 탈착, XRD, FT-IR분석을 실시하였다. 표면분석결과 함침된 아민은 흡착제 내 결정의 형성에 영향을 주지 않으며 아민으로 함침된 MS13X의 BET표면적은 $718.335m^2/g$에 $19.945m^2/g$으로 감소하였다. 이 결과는 MS13X의 기공부피에 아민 분자가 채워짐으로써 질소흡착을 제한하는 것으로 보인다. MS13X-MEA는 ZSM5-MEA비해 이산화탄소 흡착능의 개선효과가 있었으며 이는 물리적 흡착과 화학적 흡착에 의한 것으로 사료된다. 또한 MS13X-MEA의 이산화탄소 흡착능은 MS13X에 비해 $60{\sim}80^{\circ}C$의 온도에서도 증가됨을 보여 주었다.