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Characteristics of CO2 Gasification with Waste in High Temperature Reaction Field
Jin-Han Yun,Sang-In Keel,Chung-Kyu Lee 한국폐기물자원순환학회 2015 한국폐기물자원순환학회 학술대회 Vol.2015 No.05
We carried out to investigate of CO2 reaction mechanism in oxy gasification reaction field. Capacity of gasification system is 0.5ton/day and that consists of feeder, gasification reactor assembled ash melting function, multi cyclone, wet scrubber, combustion chamber, heat exchanger, bag filter, ID fan and noncatalyst (steam reformer)/catalyst reformer. Gasification temperature was about 1,400~1,450℃ and RPF was used as a input material. We confirmed to possibility of Boudouard Reaction at the oxy gasification system. Boudouard Reaction is a reaction between carbon(soot) and carbon monoxide in the reaction field. We can find that the more Boudouard Reaction, the more residence time. For optimal reforming conditions such as temperature, amount of steam and residential time were investigated. It can be acquired that conditions of 45% H2 concentration and 3.0 H2/CO ratio in non-catalyst syngas reforming test and conditions of 60% H2 and 35% CO2 concentration in catalyst syngas reforming test.
Characteristics of CO<sub>2</sub> Gasification with Waste in High Temperature Reaction Field
( Jin-han Yun ),( Sang-in Keel ),( Chung-kyu Lee ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2015 No.-
We carried out to investigate of CO<sub>2</sub> reaction mechanism in oxy gasification reaction field. Capacity of gasification system is 0.5ton/day and that consists of feeder, gasification reactor assembled ash melting function, multi cyclone, wet scrubber, combustion chamber, heat exchanger, bag filter, ID fan and noncatalyst (steam reformer)/catalyst reformer. Gasification temperature was about 1,400~1,450℃ and RPF was used as a input material. We confirmed to possibility of Boudouard Reaction at the oxy gasification system. Boudouard Reaction is a reaction between carbon(soot) and carbon monoxide in the reaction field. We can find that the more Boudouard Reaction, the more residence time. For optimal reforming conditions such as temperature, amount of steam and residential time were investigated. It can be acquired that conditions of 45% H<sub>2</sub> concentration and 3.0 H<sub>2</sub>/CO ratio in non-catalyst syngas reforming test and conditions of 60% H2 and 35% CO<sub>2</sub> concentration in catalyst syngas reforming test.
Consideration of reversed Boudouard reaction in solid oxide direct carbon fuel cell (SO-DCFC)
Zuh Youn Vahc,이성철 한양대학교 세라믹연구소 2018 Journal of Ceramic Processing Research Vol.19 No.6
The direct carbon fuel cell (DCFC) has attracted researcher’s attention recently, due to its high conversion efficiency and itsabundant fuel, carbon. A DCFC mathematical model has developed in two-dimensional, lab-scale, and considers Boudouardreaction and carbon monoxide (CO) oxidation. The model simulates the CO production by Boudouard reaction and additionalelectron production by CO oxidation. The Boudouard equilibrium strongly depends on operating temperature and affects theamount of produced CO and consequentially affects the overall fuel cell performance. Two different operating temperatures(973 K, 1023 K) has been calculated to discover the CO production by Boudouard reaction and overall fuel cell performance. Moreover, anode thickness of the cell has been considered to find out the influence of the Boudouard reaction zone in fuel cellperformance. It was found that in high temperature operating DCFC modeling, the Boudouard reaction cannot be neglectedand has a vital role in the overall fuel cell performance.
외부 유입 가스 조절을 통한 연료전지 구동 성능 안정화
장한샘 ( Hansaem Jang ),박영은 ( Youngeun Park ),이재영 ( Jaeyoung Lee ) 한국공업화학회 2018 공업화학 Vol.29 No.5
연료전지는 높은 연료유연성을 갖고 있어, 탄소 및 탄화수소 등을 통해서도 전기를 생산할 수 있다. 하지만 이러한 연료원을 사용한 경우, 불안정한 장기 구동성능이 종종 관측된다. 본 연구에서는 반응기 내부에 존재하는 탄화수소가 장기 구동성능을 불안정하게 함을 밝힌다. 본 연구진은 비활성기체인 아르곤을 이용하여 산화극 반응기 내부의 가스화 경로를 예측하고, 이를 통해 탄화수소의 영향을 억제하여 불안정한 장기 구동성능을 극복한다. 더 나아가, 산화극 반응기 내부에 이산화탄소를 공급하여 역부드아반응을 유도한다. 역부드아반응을 통해 탄소연료전지에서 연료로 사용될 수 있는 일산화탄소를 만들어낸다. 과도한 이산화탄소의 주입은 오히려 연료손실 등의 문제를 야기함을 확인한다. 따라서, 본 연구에서는 이산화탄소 공급량의 최적화가 중요함을 밝히고, 이를 통해 연료전지 구동 성능을 안정화한다. Fuel cell is one of the promising electrochemical technologies enabling power production with various fuel sources such as hydrogen, hydrocarbon and even solid carbon. However, its long-term performance is often unstable and unpredictable. In this work, we observed that gasification-driven hydrocarbons were the culprit of unpredictability. Therefore, we controlled the presence of hydrocarbons with the help of external gas supply, i.e. argon and carbon dioxide, and suggested the optimal amount of carbon dioxide required for predictable fuel cell operations. Our optimization strategy was based upon the following observations; carbon dioxide can work as both an inert gas and a fuel precursor, depending on its amount present in the reactor. When deficient, the carbon dioxide cannot fully promote the reverse Boudouard reaction that produces carbon monoxide fuel. When overly present, the carbon dioxide works as an inert gas that causes fuel loss. In addition, the excessive carbon monoxide may result in coking on the catalyst surface, leading to the decrease in the power performance.
Evaluation of steady-state characteristics for solid oxide carbon fuel cell short-stacks
Mushtaq, Usman,Mehran, Muhammad Taqi,Kim, Sun-Kyoung,Lim, Tak-Hyoung,Naqvi, Syed Asad Ali,Lee, Jong-Won,Lee, Seung-Bok,Park, Seok-Joo,Song, Rak-Hyun ELSEVIER 2017 APPLIED ENERGY -BARKING THEN OXFORD- Vol.187 No.-
<P>Solid oxide based carbon fuel cells (SO-CFCs) offer clean and efficient utilization of carbon based fuels for energy conversion. In this work, we have realized and operated 100 and 200 W-class solid oxide carbon fuel cell (SO-CFC) short stacks to investigate the fuel supply, electrochemical performance, continuous operation, long-term stability, and scale-up characteristics for SO-CFC based power generation systems. Different configurations for 100 and 200 W class short stacks were employed for integrated Boudouard gasification and carbon fuel supply at the stack level. For the 100 W class SO-CFC short stack, maximum stack power of 80.4, 93.5, and 111.5 W was achieved at 700, 750, and 800 degrees C, respectively, while the 200 W class SO-CFC short stack produced maximum power of 224.4 W at 750 degrees C when operated on carbon fuel. Both SO-CFC short stacks were operated continuously at galvanostatic conditions to study the fuel supply conditions and long-term degradation behavior of the tubular cells in the short stacks. A postmortem analysis of the SO-CFC anode was also performed by SEM and XRD to elucidate the reasons for stack performance degradation during relatively longer operation with carbon fuels. Through a detailed analysis of the dry gasification in the integrated gasifier, the electrochemical performance of the SO-CFC stacks, and the post operation diagnosis of the cells, this study provides details on the important challenges in scaling-up SO-CFC technology from a single-cell to a several hundred watt power generation system. (C) 2016 Elsevier Ltd. All rights reserved.</P>
A TGA study of CO 2 gasification reaction of various types of coal and biomass
Tahereh Jalalabadi,Chengguo Li,Hakgyu Yi,Donggeun Lee 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.7
The CO 2 gasification kinetics of various carbonaceous samples of high- and low-rank coal and a biomass were determined under CO 2flow with increasing temperature in a Thermogravimetric analysis (TGA) coupled with Fourier transform infrared spectroscopy (FTIR). We utilized four different types of fuels and their chars with significant differences in their physico-chemical properties that are being most widely used in Korea. As a result, fuels with larger surface area and more catalytic components in ash were preferred for increasing the intrinsic reactivity of CO 2 gasification particularly for low-rank coals and biomass, respectively. It was postulated that the catalytic effect of ash components could compensate for the lack of active sites in the biomass samples. From the practical point of view, the utilization of the low-rank coal with the porous char structure with blending the biomass is recommended for a remarkable increase of the gasification rate.