• Title/Summary/Keyword: Plate type reformer

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The Performance & Operation Analysis of a Plate Type Reformet for 2 kW Class MCFC Stack (2 kW급 MCFC용 평편형 개질기 운전결과)

  • Seo, Hal-Kung;Ahn, Kyo-Sang;Lim, Hee-Chun;Lee, Sang-Deuk
    • Transactions of the Korean hydrogen and new energy society
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    • v.13 no.2
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    • pp.159-167
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    • 2002
  • The operation results of the 2kW class plate type reformer, which has several advantages compared with the tubular burner type reformer, are analyzed. This plate type reformer is composed of six combustion chambers and five reforming chambers by turns. The methane conversion rate at 1.6 absolute pressure is about 84%, which is reasonably similar to theoretical value, 85.3%. Though the abrupt interruption was made just by the carbon deposition during heating the fuel line to combustion chambers around 200 hours operation, the overall steady state operation is more than 450 hours. These operation results show the verification of long run performance and the possibility of direct connection between plate reformer and fuel cell stack.

The Efficiency Prediction for Plate Type Steam Reformer with Shape Change of Combustion Chamber (평판형 STR의 연소공간 형상변화에 따른 성능 예측)

  • Kim, Hun-Ju;Lee, Ji-Hong;Lee, Myeong-Yong;Lee, Sang-Seok;Lee, Do-Hyung
    • Transactions of the Korean hydrogen and new energy society
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    • v.21 no.4
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    • pp.286-294
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    • 2010
  • According to the propagation of fuel cell system, the importance of that system efficiency is being magnified. Thus, the efficiency improvement of reformer which is the important part of fuel cell system will be required. In structural aspect, the reformer is classified into cylindrical and plate type. Plate type reformer features better maintenance and space efficiency compared with cylindrical type. In this study, we changed the shape of combustion chamber to improve the reforming efficiency. And then we performed the CFD simulation to predict the spacial distribution of temperature. Analysis cased contains with baffles, fins, baffles and fins, and without those. In case of only with-baffle, temperature distributions were uneven because the high temperature stream was concentrated near the baffle end. In case of with-fin, the temperature distributions were relatively even than other cases.

Computational Fluid Dynamics Analysis of 25kW Plate Type Methane-steam Reformer (25kW급 평판형 메탄-수증기 개질기 열유동 전산해석)

  • Shin, Dong-Hoon;Seo, Hye-Gyung;Lim, Hee-Chun;Lee, Sang-Duk
    • 한국신재생에너지학회:학술대회논문집
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    • 2006.06a
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    • pp.103-106
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    • 2006
  • The Plate reformer consisting of combustion chamber and reforming chamber for 25 kW MCFC stack has been operated and computational fluid dynamics was applied to estimate reactions and thermal fluid behavior in the reformer. The methane air 2-stage reaction was assumed in the combustion chamber, and three step steam reforming reactions were included in the calculation. Flow uniformity, reaction rate and species distribution, and temperature distribution were analyzed. In particular, temperature distribution was compared with the measurements to show good agreement in the combustion chamber, however, inappropriate agreement in the reformer chamber

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Computational Fluid Dynamics Analysis of Plate Type Reformer for MCFC (용융탄산염 연료전지용 평판형 개질기 열유동 전산유체역학 해석)

  • Shin, Dong-Hoon;Seo, Hye-Gyung;Lim, Hee-Chun;Lee, Sang-Duk
    • Transactions of the Korean hydrogen and new energy society
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    • v.17 no.4
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    • pp.403-408
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    • 2006
  • The plate reformer consisting of combustion chamber and reforming chamber for 25 kW MCFC stack has been operated and computational fluid dynamics was applied to estimate reactions and thermal fluid behavior in the reformer. The methane air 2-stage reaction was assumed in the combustion chamber, and three step steam reforming reactions were included in the calculation. Flow uniformity, reaction rate and species distribution, and temperature distribution were analyzed. In particular, temperature distribution was compared with the measurements to show good agreement in the combustion chamber, however, inappropriate agreement in the reformer chamber.

Efficiency Analysis of Compact Type Steam Reformer (컴팩트형 수증기 개질장치 효율분석)

  • Oh, Young-Sam;Song, Taek-Yong;Baek, Young-Soon;Choi, Lee-Sang
    • Transactions of the Korean hydrogen and new energy society
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    • v.13 no.4
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    • pp.304-312
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    • 2002
  • In this study, the performance of the $5Nm^3/hr$ compact type steam reformer which was developed for application of fuel cell or hydrogen station was evaluated in terms of gas process efficiency. For these purposes, reforming efficiency and total efficiency with system load change were analyzed. The reforming efficiency was calculated from the total molar flow of hydrogen output over total fuel flow input to the reformer and the burner on the higher heating value(HHV). In the case of the total efficiency, recovered heat at the heat recovery exchanger was considered. From the results, it was known that system performance was stable, because methane conversion showed the a slight decline which is about 2% though increasing system load to full. Reforming efficiency was increased from 20% to 58%, respectively as increasing system load from 10% to 90%. It was found that total efficiency was higher then reforming efficiency because of terms of heat recovered. As a results, it was known that total efficiency was increased form 75% to 83% at the 10% and 90% system load, respectively. From these results, it is concluded that compact steam reformer which is composed of stacking plate-type reactors is suitable to on-site hydrogen generator or to fuel cell application because of quick start within 1 hr and good performance.

The performance evaluation for H2 reforming of the plate type hydrogen generation system (평판형 수소생산시스템의 수소개질 성능평가)

  • Heo, Su-Bin;Yun, Bong-Seock;Lee, Do-Hyung
    • Journal of Advanced Marine Engineering and Technology
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    • v.38 no.6
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    • pp.602-608
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    • 2014
  • Hydrogen energy, a field of low-carbon substitute energy, can be produced by fossile fuel reforming and electrolysis of water etc. We developed 1kW class flat type reformer for PEM Fuel Cells. The PEMFC is highly sensitive to carbon monoxide because CO has detrimental effects on the performance of the fuel cell. Thus, reformed gas supplied to Fuel cell system, which maintained CO concentration below 10ppm. After applying optimum drive condition, reformed gas was measured with gas chromatography and could find out about each experimental condition of $H_2$ and CO concentration. As a results, The 1kW class plate type hydrogen generation system's optimum condition is A/F ratio ${\alpha}=1.3$, STR temperature 1023K, S/C ratio 3, and $PrOx1{\cdot}2$ 30cc/min. It turns out that installation of PrOx 2 stage is more efficient for reducing CO concentration.

Planar fuel cell design integrated with methanol reformer by using a high temperature membrane (고온형 멤브레인을 사용한 메탄올 개질 연료전지의 개질기 일체형 평판 설계)

  • Kim, Sung-Han;Jang, Jae-Hyuk;Gil, Jae-Hyoung;Lee, Hong-Ryul;Cha, Hye-Yeon;Ku, Bo-Sung;Jung, Chang-Ryul;Kundu, Arunaha;Miesse, Craig;Oh, Yong-Soo
    • 한국신재생에너지학회:학술대회논문집
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    • 2006.11a
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    • pp.467-470
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    • 2006
  • For a mobile application such as cellular phone, micro fuel cells should be extremely compact and thin. RHFC can be an alternative solution because RHFC gives higher power density than DMFC and does not need ahydrogen storage vessel In this paper, RHFC using methanol fuel is made as a novel planar design without a PROX. Both reformer and cell are made closely in a same plate to share the heater of reformer with the cell. The PBI membrane is used in the cell. The reason is that high temperature of reformer can cause a performance drop when perfluorosulfonic acid membrane such as Nafion is used such a high temperature operation also guarantees the higher CO tolerance to MEA catalyst. The cell is designed as an air-breathing type which the cathode of the cell is opened to the air. The commercial Cu/ZnO/Al2O3 steam reformer catalyst is packed in reformer channel. The active area of MEA is $11.9cm^2$ and the peak power density was $27.5mW/cm^2$.

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Development of $20\;Nm^3$/hr Hydrogen Generator for Hydrogen Fueling Station (수소스테이션용 $20\;Nm^3$/hr급 수소제조장치 개발)

  • Oh, Young-Sam;Baek, Young-Soon
    • Transactions of the Korean hydrogen and new energy society
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    • v.17 no.3
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    • pp.263-271
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    • 2006
  • In this study, $20\;Nm^3/hr$ scale compact hydrogen generator which can be apply to the hydrogen station was manufactured and tested. The design of $20\;Nm^3/hr$ scale compact hydrogen generator was upgraded on the base of $5\;Nm^3/hr$ scale plate hydrogen generator concept stacking the plate reactors. Ideas for improving system efficiency such as heat recovery from the exhaust, exhaust duct which is especially design for plate type reactor, reinforcement of insulation, enlargement of heat exchange area of reactor, introduction of desulphurizer reactor and PROX rector in a compact design etc. were applied. From the performance test, we can learn that the $20\;Nm^3/hr$ scale compact hydrogen generator can be operated steadily at 100% road condition and the methane conversion of over 94%(at S/C=3.75) was obtained. This result shows that the concept of plate type hydrogen generator can be scale-up to the $20\;Nm^3/hr$ scale and fit for hydrogen generator for on site hydrogen station application.

Performance test of scale-up $20Nm^3/hr$ scale hydrogen generator for hydrogen station (수소스테이션용 $20Nm^3/hr$급 수소제조장치 스케일-업 및 성능시험)

  • Oh, Young-Sang;Baek, Young-Soon
    • 한국신재생에너지학회:학술대회논문집
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    • 2006.06a
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    • pp.37-42
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    • 2006
  • In this study, $20Nm^3/hr$ scale compact hydrogen generator which can be apply to the hydrogen station was tested for hydrogen station application. $20Nm^3/hr$ scale compact hydrogen generator was developed by upgrading concept of stacking plate reactor from former $20Nm^3/hr$ scale plate hydrogen generator. concepts for improving system efficiency and performance include such as idea of heat recovery from the exhaust, exhaust duct which is especially design for plate type reactor reinforcement of insulation, enlargement of heat exchange area of reactor, introduction of desulphurizer reactor and PROX rector in a compact design, introduction of back fire protection structure of plate burner and so on, We can learn that final prototype of scale-up $20Nm^3/hr$ scale compact hydrogen generator can be operated steadily in 100% road at which over 94% of methane conversion(S/C=3.75) was obtained. In case of making up the weak point, we expect that it is possible to apply to hydrogen station by way of showing an example.

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A study on the Temperature Profile with combustion conditions change for the Optimum drive of Plate type Hydrogen Generation Sytem (평판형 수소생산시스템의 최적 운전조건을 위한 연소조건별 분위기 온도 연구)

  • Heo, Su-Bin;Park, Jae-Min;Yoon, Bong-Seock;Lee, Do-Hyung
    • Journal of Advanced Marine Engineering and Technology
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    • v.36 no.2
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    • pp.238-243
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    • 2012
  • The purpose of this study is to search the temperature-rise time conditions for adequate reforming temperature region of hydrogen generation system. And we measured theexhaust gas at the exit of that system in order to know the combustion state of hydrogen generation system's combustor. We found the optimum condition of heat supply and temperature-rise time at well burned state. And the results were nearly same when the reactants were entered to each reactors. We will further consider the effects of temperature change near the exothermic reactors and find out hydrogen yield through reforming experiment.