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수소생산 고정화 생물반응기의 특성 (Ⅲ) : 루프 반응기에서의 수소 생산 Hydrogen Production in a Nozzle Loop Reactor
이충곤,선용호,한정우,이현순,조영일 한국산업미생물학회 1989 한국미생물·생명공학회지 Vol.17 No.6
The continuous production of hydrogen in a nozzle loop reactor was investigated using Ca-alginate immobilized Rhodospirillum rubrum KS-301 with glucose, as the growth-limiting substrate. The specific substrate consumption rate of the immobilized bacteria was expressed as follow; -r_a=0.114 S/ (1.25 + S) In the continuous reactor, the hydrogen production rate and residual glucose concentration were increased with increase of input glucose concentration, dilution rate, and recycle rate. The maximum production rate was 91 mL/L·h at dilution rate 0.4/h, input glucose concentration 5.4 g/L, and recycle rate 70/h in this experimental range.
이충곤,임희천,안교상,박성연,서혜경 한국수소및신에너지학회 2004 한국수소 및 신에너지학회논문집 Vol.15 No.1
Temperature characteristics in a stack of molten carbonate fuel cell (MCFC) have been investigated with simulation based on the computational fluid dynamics (CFD) codes and experimental way. The MCFC has generally two stack structures when the natural gas is used as fuel; one is the external reforming type and the other is internal reforming type. Computer simulation at the external reforming stack suggests that the maximum temperature in the stack depends on the gas flow length. The 2 kW MCFC stack with 25 cm gas flow length showed about 675℃ of maximum temperature.
용융탄산염형 연료전지에서 기상물질전달의 영향 (XI) -가압하에서의 불활성가스 계단형 첨가법 측정-
이충곤,임희천 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.1
저자들은 용융탄산염형 연료전지의 전극반응에서 기상의 물질전달의 영향을 검토해오고 있다. 본 연구에서는 가압하의 용융탄산염형 연료전지에서 기상의 물질전달의 영향을 불활성 가스 계단형 첨가법 (Inert gas step addition, ISA)을 통해 검토하였다. 사용한 전지는 전극면적 100 cm2급의 단위전지로서 불활성가스로 질소를 사용하였으며, 절대압 3기압의 가압하에서 ISA의 측정이 가능함을 알았다. Anode 및 cathode 모두 가압하에서 불활성 가스 첨가에 의한 전압변화가 가스 부피감소에 의해 느리게 나타났으나, 유량변화에 따른 명확한 전압변화가 관찰되었다. 이 결과로부터 가압하에서도 기상의 물질전달 저항이 전극반응에 영향을 미침을 알 수 있었다. ISA법의 측정결과로부터 anode 및 cathode모두에서 기상의 물질전달에 의한 과전압이 가압에 의해 약간 증가하는 것이 관찰되어, 가압에 의해 기상의 물질전달 저항이 증가함을 알았다.
Gasification of ash-free coal prepared with microwave method
이충곤,Won-Ki Kim,Duc-Luong Vu 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.9
The production of ash-free coal as a clean fuel for high temperature fuel cell was investigated. The ash-free coal was made from a bituminous coal. It was prepared by solvent extraction using a microwave. The solvent-to-coal ratio and microwave irradiation time of raw coal were parameters for the extraction yield. The microwave method showed merits in terms of faster extraction and higher extraction yield than conventional heating methods. In addition, gasification behaviors of the ash-free coal were investigated by gas chromatography. Contrary to carbon, ash-free coal showed hydrogen as a dominant gas species in its gasification and did not require carbonate catalyst. The electrical conductivity of ash-free coal was found very low close to zero.
Comparison of Catalytic Activity for Methanol Electrooxidation Between Pt/PPy/CNT and Pt/C
이충곤,J.-S. Baek,D.-J. Seo,J.-H. Park,전경용 한국전기화학회 2010 한국전기화학회지 Vol.13 No.4
This work explored the catalytic effect of Pt in multi-wall carbon nanotube and poly-pyrrole conductive polymer electrocatalysts (Pt/PPy/MWCNT). A home-made Pt/PPy/MWCNT catalyst was first evaluated by comparing its electrochemical active surface area (ESA) with E-Tek commercial catalysts by cyclic voltammetry in H2SO4 solution. Then, the methanol oxidation currents of Pt/PPy/MWCNT and the hydrogen peaks in H2SO4 solution were serially measured with microporous electrode. This provided the current density of methanol oxidation based on the ESA, allowing a quantitative comparison of catalytic activity. The current densities were also measured for Pt/C catalysts of E-Tek and Tanaka Precious Metal Co. The current densities for the different catalysts were similar, implying that catalytic activity depended directly on the ESA rather than charge transfer or electronic conductivity.