• 제목/요약/키워드: technology and environment

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PSA 공정에 의한 이성분 및 삼성분 혼합기체로부터 수소분리 (Hydrogen Separation from Binary and Ternary Mixture Gases by Pressure Swing Adsorption)

  • 강석현;정병만;최현우;안의섭;장성철;김성현;이병권;최대기
    • Korean Chemical Engineering Research
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    • 제43권6호
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    • pp.728-739
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    • 2005

  • 활성탄을 흡착제로 이용한 2bed-6step PSA 공정에서 이성분 혼합기체 $H_2/Ar$(80％/ 20％)와 삼성분 혼합기체 $H_2/Ar/CH_4$(60％/ 20％/ 20％)의 수소 분리를 연구하였다. 비등온-비단열 상태에서 LRC 등온식과 LDF 모델을 고려하여 공정실험과 공정모사를 하였으며, 주기정상상태에 도달할 때까지 탑 내의 농도와 온도변화를 각각 알아보았다. 두 공정 모두에서 수소에 대한 순도 99％와 회수율 75％의 결과를 얻을 수 있었다. 이때, PSA 공정에 미치는 영향으로는 공급유량, 흡착압력 그리고 P/F ratio를 변수로 실험과 전산모사를 수행하여 결과를 비교하였다. 이 결과로부터, 다성분에서 최적의 공정조건을 결정에서 중요한 결정요인과 삼성분에서 최적의 공정조건을 알아보았다.

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고온 세라믹필터의 펄스젯 탈진 성능에 관한 연구 (A Study on the Performance of Pulse Jet Cleaning in High Temperature Filter)

  • 김병렬;박승철;박병철;조현준;오형모;황태원;신상운
    • 방사성폐기물학회지
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    • 제3권1호
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    • pp.9-16
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    • 2005

  • To evaluate parameters influencing on the dust removal of the High Temperature Filter(HTF) system, a computer simulation of fluid dynamics inside the system had been performed. The results showed that the optimum pulse jet periods were 50ms and 90ms for the 1000mm and 1500mm long filter elements respectively. Dust removal effect was very excellent under the pulse jet pressure of 3 bar. But the distance between the pulse jet nozzle and the venturi of a filter element had no meaningful effect on the performance with the variation from 5mm to 10mm. Compared to the dispersion mode of pulse jet, the collective mode of pulse jet flow was preferable in maintaining the pressure inside the system stable.

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Hydrogen Bonding Effect on γ-Ray Irradiated Poly(vinyl alcohol) Hydrogels in Different Drying Conditions

  • Gwon, Hui-Jeong;Jo, Sun Young;Park, Eun Ji;Shin, Young Min;Choi, Jong-Bae;Park, Jong-Seok;Lim, Youn-Mook;Nho, Young-Chang;Kang, Phil Hyun
    • 방사선산업학회지
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    • 제6권1호
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    • pp.89-94
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    • 2012

  • Three-dimensional network hydrogels were prepared by ${\gamma}$-irradiation of aqueous solutions of poly(vinyl alcohol) (PVA) and glycerol (Gly). Oven-drying was used to measure the gel fraction (G), hydration (H) or swelling behavior (S) of the prepared hydrogels. This study made a hypothesis that hydrogen bonds due to addition of glycerol and change of dry states such as freeze-drying (FD), room-drying (RD) and oven-drying (OD) acts on the G, H, and S. Interesting results on the hydrogen bonding effect in the prepared hydrogels are monitored at different drying conditions. The FD samples have a higher G values with increase in glycerol content as compared with the OD and RD samples. The formation of strong hydrogen bonding network among Gly molecules and hydrogel matrix was considered as the main driving force, resulting in the changes in the G, H, and S of the hydrogels under different drying conditions.