Jonghee Han

Enhancement of Mechanical Strength Using Nano Aluminum Reinforced Matrix for Molten Carbonate Fuel Cell

Abstract >> 용융탄산염 연료전지 상용화를 위해서 40,000 시간이상 장기 운전이 가능해야 한다. 장기운전을 위해크랙 발생이 적고 기계적 강도가 높은 강화 매트릭스의 개발이 절실히 요구되고 있다. 본 연구에서는 LiAlO 2 에알루미늄 나노입자를 첨가하여 매트릭스의 기계적 강도를 향상시키는 연구를 수행하였다. 나노 알루미늄 첨가LiAlO 2 그린 시트를 수소 분위기에서 열처리한 결과, 공기 분위기에서 열처리한 매트릭스에 비해 기계적 강도가1.5배 증가함을 확인하였다. 이는 환원분위기에서 열처리를 할 경우, 알루미늄의 입자간의 소결으로 인한 neck이형성 되어 LiAlO 2 입자 간에 다리를 만들어주는 효과가 나타나 매트릭스의 기계적 강도가 크게 증진되었으리라판단된다. Key words : MCFC(용융탄산염전지), Reinforced matrix(강화매트릭스), Sintering(소성), Aluminium(알루미늄),Reducing atmosphere(환원성 분위기) † Corresponding author : jhan@kist.re.krKimsh@korea.ac.kr [ 접수일 : 2012.3.28 수정일 : 2012.4.23 게재확정일 : 2012.4.27 ] 1. Introduction The molten carbonate fuel cell (MCFC) has been regarded as a promising alternative energy source for power generation systems because its electrochemical conversion efficiency is high, it offers fuel flexibility, it is environment friendly, and it provides combined heat and power (CHP) 1-3) . Nowadays, MCFC pre-pares to enter the stage of commercialization. For commercialization, a 40,000h operation time of the MCSC stacks should be guaranteed. One of the most important factors for long-term operation is ensuring the stability of the matrix that plays an important role both as a reservoir of liquid electrolyte and as an

Hydrodesulfurization of Diesel for Molten Carbonate Fuel Cell Applications

Hydrogen production from commercial diesel fuels is an attactive option for energy generation purpose due to the low cost and good availability of diesel fuels. However, in order to utilize commercial diesel fuels, the sulfur contents must be removed down to approximately 0.1 ppm level to protect the fuel cell catalysts from poisoning. Commercial catalysts CoMo/Al2O3 and NiMo/Al2O3 were tested for HDS (Hydrodesulfurization) of model diesel and commercial diesel. The experimental conditions were 250 - 400 °C and LHSV (Liquid Hourly Space Velocity) 0.27 - 2.12 hr -1 . NiMo/Al2O3 was found to be more effective than CoMo/Al2O3 in removing sulfur from model diesel. Based on the experimental results of model diesel, commercial diesel fuel purchased from a local petrol station was tested for HDS using NiMo/Al2O3. The GC-SCD (Gas Chromatography Sulfur Chemiluminescence Detector) results showed that the DMDBT (Dimethyldibenzothiophene) derivatives were fully removed from the commercial diesel fuel proving that HDS with NiMo/Al2O3 is technically feasible for industrial applications.