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Reliable sealing design of metal-based solid oxide fuel cell stacks for transportation applications
Lee, Sanghun,Jang, Young-hoon,Shin, Ho Yong,Lee, Kunho,Bae, Minseok,Kang, Juhyun,Bae, Joongmyeon Pergamon Press 2019 International journal of hydrogen energy Vol.44 No.57
<P><B>Abstract</B></P> <P>Recently, metal-based solid oxide fuel cells (SOFCs) receive much attention as new power converting systems, and reliable sealing is an essential requirement for the metal-based SOFC stacks. In this study, metal-based SOFC stacks with a reliable sealing method are developed for transportation applications. For successful development, bolt-spring and hydraulic compression methods for stack tightening are discussed in terms of their applicability to vehicles. Then, detailed stack designs are developed to obtain sufficient compressive stress on the surfaces of the sealing gaskets based on the finite element method (FEM). To maintain the compression and heat insulation of the stack, a hot box is designed based on the thermogravimetric properties, shrinkage behaviors, and mechanical properties of sealing gaskets of mica and Thermiculite 866LS, and ceramic fiber insulating board. As a result, a 1-cell stack unit is successfully fabricated and tested based on the designs, and a sealing rate of 100 ± 0.78% is achieved at an operating temperature of 800 °C. This study investigates comprehensive stack and sealing design processes, and it has broad implications for reliable stack development.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A metal-based solid oxide fuel cell stack was designed for reliable sealing. </LI> <LI> Bolt-spring and hydraulic compression methods were discussed for vehicles. </LI> <LI> Finite element analysis was conducted for sufficient stress on sealing gaskets. </LI> <LI> A hot box was designed to maintain compression and heat insulation of the stack. </LI> <LI> A sealing rate of 100% of 1-cell stack unit was achieved at a temperature of 800 °C. </LI> </UL> </P>
Effect of Soil Salinity Levels on Silage Barley Growth at Saemangeum Reclaimed Tidal Land
Sanghun Lee,Hui-Soo Bae,Soo-Hwan Lee,Jong-Gook Kang,Hong-Kyu Kim,Kyeong-Bo Lee,Ki-Hoon Park 한국토양비료학회 2013 한국토양비료학회지 Vol.46 No.5
Crop development and nutrient availability are strongly influenced by soil salinity levels. This study was conducted to investigate the effect of rice straw and nitrogen (N) fertilizer for silage barley under various soil salinity levels at Saemangeum reclaimed tidal land. Three levels of rice straw (0, 2.5, 5.0 ton rice straw ha<SUP>-1</SUP>) and N (0, 150, 225 kg N ha<SUP>-1</SUP>) were applied at 0.04, 0.23, 0.35% soil salinity levels. Biomass yield of silage barley was influenced by the interactions between rice straw application and N fertilization. Although there was no single effect of rice straw application on biomass yield, it was significantly increased with N application and a rice straw application of 5.0 ton ha<SUP>1</SUP>. Sodium content in silage barley was significantly lower at 0.04% salinity level, and but it was statistically increased with increasing soil salinity levels. Forage qualities such as total digestible nutrients and relative feed value of silage barley were significantly higher with N application at 0.04% salinity level, but there was no effect of rice straw application. Soil organic matter content was increased with N and rice straw application regardless of soil salinity level. The results of this study showed that the effect of rice straw and N fertilization on silage barley was influenced by soil salinity levels, which indicates that the management practice of silage barley at Saemangeum reclaimed tidal land should consider soil salinity levels.
Effect of Capillary Barrier on Soil Salinity and Corn Growth at Saemangeum Reclaimed Tidal Land
Sanghun Lee,Su-Hwan Lee,Hui-su Bae,Jang-Hee Lee,Yang-Yul Oh,Tae-Hwan Noh,Geon-Hwi Lee 한국토양비료학회 2014 한국토양비료학회지 Vol.47 No.6
Salt accumulation at soil surface is one of the most detrimental factors for crop production in reclaimed tidal land. This study was conducted to investigate the effect of capillary barriers beneath the soil surface on dynamics of soil salts at coarse-textured reclaimed tidal land. A field experiment was conducted at Saemangeum reclaimed tidal land for two years (2012-2013). Capillary barriers (3.5x12 m) were treated with crushed-stone, oyster shell waste, coal briquette ash, coal bottom ash, rice hull and woodchip at 40-60 cm depth from soil surface. Silage corn (Zea mays) was cultivated during the experimental period and soil salinity was monitored periodically. Soil salinity was significantly reduced with capillary barrier compared to that of control. Oyster shell waste was one of the most effective capillary barrier materials to control soil salinity at Saemangeum reclaimed tidal land. At the first growing season capillary barrier did not influence on corn growth regardless of types of the material, but plant biomass and withering rate of corn were significantly improved with capillary barrier at the second growing season. The results of this study showed that capillary barrier was effective on the control of soil salinity and improvement of corn growth, which indicated that capillary barrier treatment can be considered one of the best management practices for stable crop production at Saemangeum reclaimed tidal land.
Characteristics of Biochar and Its Effects on Fluvio-Marine Deposit Soils at Reclaimed Tidal Lands
Sanghun Lee(이상훈),Hee-Soo Bae(배희수),Soo-Hwan Lee(이수환),Seon-A Hwang(황선아),Kyeong-Ok Lee(이경옥),Jong-Gook Kang(강종국),Hong-Kyu Kim(김홍규),Seon-Woong Hwang(황선웅),Kyeong-Bo Lee(이경보) 한국토양비료학회 2013 한국토양비료학회 학술발표회 초록집 Vol.2013 No.5