• 멤브레인
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• 제21권4호
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• pp.345-350
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• 2011

보론이 도프된 바나듐 합금 분리막은 아직까지 연구된 적이 없다. 본 연구에서는 팔라듐이 코팅된 새로운 $V_{99.8}B_{0.2}$ 조성의 합금 분리막을 합성하여 수소 투과 특성 및 화학적 안정성에 대하여 연구를 수행하였다. 순수 수소, 수소와 이산화탄소의 혼합가스를 $400^{\circ}C$, 절대압력 1.0~3.0 bar에서 공급하여 수소 투과 특성을 알아보았다. 순수 수소를 공급하여 측정한 결과 0.5 mm 두께의 분리막은 최대 $48.5mL/min/cm^2$의 투과량을 보였다. 본 연구 결과는 수성가스 전이반응(WGS)에서 생성된 수소를 분리할 수 있는 비 팔라듐계 수소 분리막의 합성에 새로운 방향을 제시하고 있다.

• 멤브레인
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• 제22권1호
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• pp.16-22
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• 2012

팔라듐이 코팅된 $V_{99.8}B_{0.2}$ 합금 분리막을 통해 sweep 가스를 사용하지 않고 수소 투과 시 혼합가스의 영향에 대해 알아보았다. 분리막은 $400^{\circ}C$에서 sweep 가스를 사용하지 않고 순수 수소, 수소/이산화탄소, 수소/일산화탄소의 혼합가스를 1.5~8.0 bar의 압력으로 실험하였다. Sweep 가스를 사용하지 않고 수소만을 공급한 투과 실험에서 팔라듐 코팅된 $V_{99.8}B_{0.2}$ 합금 분리막(두께 : 0.5 mm)의 수소 투과량은 $40.7mL/min/cm^2$였다. 또한 수소/이산화탄소를 공급한 투과실험에서 $V_{99.8}B_{0.2}$ 합금 분리막의 수소 투과량은 $21.4mL/min/cm^2$였다. 수소/이산화탄소 및 수소/일산화탄소 혼합가스를 각각 공급할 때 투과량은 압력에 상관없이 수소 분압 감소 만큼 감소하였고 모든 경우 Sievert 법칙을 잘 만족시켰다. 투과 후 분리막의 XRD, SEM/EDX 결과로부터 $V_{99.8}B_{0.2}$ 합금 분리막은 여러 혼합가스에 대해 안정성과 내구성이 우수하다는 것을 알 수 있었다.

• 한국산업융합학회 논문집
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• 제27권2_2호
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• pp.475-485
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• 2024

In many regions of Korea, including the Four Major Rivers, the seriousness of the problem of algal blooms due to eutrophication of water quality is being raised.In this study, in order to solve these social problems, we manufactured a filter using natural mineral fusion (red illite, zeolite, germanium ceramic, selenium ceramic, carbon ceramic) and independently developed a tank system for green algae experiments to observe and determine the stages of change in water quality. In order to study ways to improve water quality through quantitative analysis, 1 ton of severely polluted green algae water from the Nak dong River region was stored in a water tank and exposed to ultraviolet rays in the same environment as the Nak dong River. Then, the same environment as the Nak dong River was created. The results were derived from a 5-week water quality test. The results of this experiment confirmed that green-colored cyano bacteria were significantly reduced just by the turbidity results. The results were obtained through a request to the Korea Testing & Research Institute located in Changwon-si, Gyeong sang nam-do. CI-(chlorine ion) and NH3-N(ammonia nitrogen) had the effect of saving every week. The device used in this study was made of natural minerals free of heavy metals that are harmless to the human body and nature through long-term consideration and exploration to kill and prevent various strains living in water. Green purification system using natural hydrogen generating mineral filter were effective a non-chemical and physical methods. The results of this study are one way to contribute to the serious problems caused by green algae in many countries, and will contribute to the water quality environment by preventing the waste of environmental resources, improving the health of the people, and increasing the ability to purify environmental water quality at home and abroad.

• 한국수소및신에너지학회논문집
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• 제21권5호
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• pp.419-424
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• 2010

The 125kW external reforming (ER) type molten carbonate fuel cell (MCFC) system for developing a commercial prototype has been operated at Boryeong thermal power plant site since the end of 2009. The system consists of 125kW stack with $10,000 cm^2$ effective area, mechanical balance of plant (MBOP) with anode recycle system, and electrical balance of plant (EBOP). The 125kW MCFC stack installed in December, 2009 has been operated from January, 2010 after 20 days pre-treatment. The stack open circuit voltage (OCV) was 214V at initial load operation, which approaches the thermodynamically theoretical voltage. The stack voltage remained stable range from 160V to 180V at the maximum generating power of 120 kW DC. The stack has been operated for 3,270 hours and operated at rated power for 1,200 hours.

• 한국수소및신에너지학회논문집
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• 제27권5호
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• pp.562-570
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• 2016

At the carbon dioxide capture process using the aqueous amine solution, degradation of absorbents is main factor to reducing the process performance. Also, degradation mechanism of absorbent is important for understanding the environmental risk, route of degradation products, health risk etc. In this study, the degradation products of MEA were studied to clarify mechanism in thermal degradation process. The degradation products were analyzed using a $^1H$ NMR (nuclear magnetic resonance) and $^{13}C$ NMR. The analysis methods used in this study provide guidelines that could be used to develop a degradation inhibitor of absorbent and a corrosion inhibitor.

• 멤브레인
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• 제20권1호
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• pp.62-68
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• 2010

Cermet 분리막 제조를 위한 혼합 분말은 60 vol.% vanadium과 $Y_2O_3$-stabilized $ZrO_2$ (YSZ)를 기계적으로 혼합하여 준비하였다. 혼합 분말을 원판으로 압축한 후 진공 분위기에서 $1600^{\circ}C$로 2시간동안 소결하였다. 소결 분리막은 치밀하였고, 브레이징 필러를 이용하여 스테인레스 링에 장착되었다. V/YSZ 분리막의 수소 투과량은 100% 수소를 흘려 $200{\sim}350^{\circ}C$ 범위에서 측정되었다. $350^{\circ}C$, 0.5 bar압력에서 분리막의 양 표면에 균열이 형성되었다. 투과실험 동안에 V/YSZ 분리막의 vanadium은 수소와 반응하여 $V_2H$를 생성하였으며, 이로 인해 분리막이 균열되는 것을 알 수 있었다.

• 한국수소및신에너지학회논문집
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• 제35권1호
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• pp.14-26
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• 2024

Global efforts continue with the goal of transition to a "carbon neutral (net zero)" society with zero carbon emissions by 2050. For this purpose, the technology of water electrolysis is being developed, which can store electricity generated from renewable energies in large quantities and over a long period of time as hydrogen. Recently, various research and large-scale projects on 'green hydrogen', which has no carbon emissions, are being conducted. In this paper, a comparison of water electrolysis technologies was carried out and, based on data provided by the International Energy Agency (IEA), large-scale water electrolysis demonstration projects were analyzed by classifying them by technology, power supply, country and end user. It is expected that through the analysis of large-scale water electrolysis demonstration projects, research directions and road maps can be provided for the development/implementation of commercial projects in the future.

• 한국수소및신에너지학회논문집
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• 제33권6호
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• pp.674-683
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• 2022

In this study, we examined the case of Fukushima Hydrogen Research Field (FH2R) Namie hydrogen town. We found that the case has three aspects of socio-technical experiment: a living-scale test-bed of hydrogen technologies, activities for enhancing social acceptability, and a designed module for policy transfer to diffuse. This study aims to provide a benchmark for planning a green hydrogen city in near future.

• 한국수소및신에너지학회논문집
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• 제22권5호
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• pp.678-685
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• 2011

An Ejector enhances system efficiency, are easily operated, have a mechanically simple structure, and do not require a power supply. Because of these advantages, the ejector has been applied to a variety of industrial fields such as refrigerators, power plants and oil plants. In this work, an ejector was used to safely recycle anode tail gas in a 75-kW Molten Carbonate Fuel Cell (MCFC) system at KEPCO Research Institute. In this system, the ejector is placed at mixing point between the anode tail gas and the cathode tail gas or the fresh air. Commercial ejectors are not designed for the actual operating conditions for our fuel cell system. A new ejector was therefore designed for use beyond conventional operating limits. In the first place, a few sample ejectors were manufacured and the entrainment ratio was measured at a dummy stack. Through this experiment, the optimum ejector was chosen. The 75-kW MCFC system equipped with this optimum ejector was operated successfully.

• 한국군사과학기술학회지
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• 제13권6호
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• pp.1180-1187
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• 2010

In the last decade, hydrogen peroxide has received renewed interest as a green propellant which is non-toxic, environmentally clean and relatively easy to handle. This study was performed to acquire the design technique and combustion performance of a 200N bi-propellant engine using hydrogen peroxide and kerosene. The engine which used a catalytic ignition method was designed and cold flow tests were carried out to investigate atomization characteristics. Combustion tests including a pulse mode operation were performed to investigate the combustion performance on various O/F ratios. The results showed that the combustion efficiency and the repeatability of the engine performance were enough to use as an essential database for the development of a high performance engine.