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首页> 外文期刊>Journal of power sources >$1Characterization of a novel, highly integrated tubular solid oxide fuel cell system using high-fidelity simulation tools
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$1Characterization of a novel, highly integrated tubular solid oxide fuel cell system using high-fidelity simulation tools

机译：$ 1使用高保真仿真工具表征新型，高度集成的管状固体氧化物燃料电池系统

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摘要

A novel, highly integrated tubular SOFC system intended for small-scale power is characterized through a series of sensitivity analyses and parametric studies using a previously developed high-fidelity simulation tool. The high-fidelity tubular SOFC system modeling tool is utilized to simulate system-wide performance and capture the thermofluidic coupling between system components. Stack performance prediction is based on 66 anode-supported tubular cells individually evaluated with a 1 -D electrochemical cell model coupled to a 3-D computational fluid dynamics model of the cell surroundings. Radiation is the dominate stack cooling mechanism accounting for 66-92% of total heat loss at the outer surface of all cells at baseline conditions. An average temperature difference of nearly 125℃ provides a large driving force for radiation heat transfer from the stack to the cylindrical enclosure surrounding the tube bundle. Consequently, cell power and voltage disparities within the stack are largely a function of the radiation view factor from an individual tube to the surrounding stack can wall. The cells which are connected in electrical series, vary in power from 7.6 to 10.8 W (with a standard deviation, ge varies from 0.52 to 0.73 V (with a = 81 mV) at the simulation baseline conditions. It is observed that high cell voltage and power outputs directly correspond to tubular cells with the smallest radiation view factor to the enclosure wall, and vice versa for tubes exhibiting low performance. Results also reveal effective control variables and operating strategies along with an improved understanding of the effect that design modifications have on system performance. By decreasing the air flowrate into the system by 10%, the stack can wall temperature increases by about 6% which increases the minimum cell voltage to 0.62 V and reduces deviations in cell power and voltage by 31 %. A low baseline fuel utilization is increased by decreasing the fuel flowrate and by increasing the stack current demand. Simulation results reveal fuel flow as a poor control variable because excessive tail-gas combustor temperatures limit fuel flow to below 110% of the baseline flowrate. Additionally, system efficiency becomes inversely proportional to fuel utilization over the practical fuel flow range. Stack current is found to be an effective control variable in this type of system because system efficiency becomes directly proportional to fuel utilization. Further, the integrated system acts to dampen temperature spikes when fuel utilization is altered by varying current demand. Radiation remains the dominate heat transfer mechanism within the stack even if stack surfaces are polished lowering emissivities to 0.2. Furthermore, the sensitivity studies point to an optimal system insulation thickness that balances the overall system volume and total conductive heat loss.
机译：通过使用先前开发的高保真仿真工具进行一系列的敏感性分析和参数研究，对旨在用于小规模发电的新型，高度集成的管状SOFC系统进行了表征。高保真管状SOFC系统建模工具用于模拟系统范围的性能并捕获系统组件之间的热流体耦合。电池堆性能预测基于66个阳极支撑的管状电池，这些电池分别通过与电池环境的3-D计算流体动力学模型耦合的一维电化学电池模型进行评估。辐射是主要的堆冷却机制，占基线条件下所有电池外表面总热损失的66-92％。平均温度差接近125℃，为将热量从烟囱传递到围绕管束的圆柱形外壳提供了很大的驱动力。因此，堆叠内的电池功率和电压差异很大程度上取决于从单个管到周围的堆叠罐壁的辐射视角因子。在模拟基线条件下，以串联方式连接的电池的功率在7.6至10.8 W（标准偏差）之间，ge在0.52至0.73 V（在a = 81 mV）之间变化。和功率输出直接对应于对外壳壁具有最小辐射视角的管状单元，反之亦然，对于性能低下的管子，结果也揭示了有效的控制变量和操作策略，并加深了对设计修改对效果的理解通过将进入系统的空气流量降低10％，烟囱壁温度可提高约6％，从而将最低电池电压提高至0.62 V，并将电池功率和电压偏差降低31％。通过降低燃料流量和增加燃料电池堆电流需求来提高利用率，仿真结果表明燃料流量是一个不好的控制变量，因为尾气燃烧器的温度过高将燃油流量限制在基准流量的110％以下。另外，在实际燃油流量范围内，系统效率与燃油利用率成反比。在这种类型的系统中，烟囱电流被认为是有效的控制变量，因为系统效率与燃料利用率成正比。此外，当通过改变电流需求来改变燃料利用率时，集成系统起到抑制温度尖峰的作用。即使将堆栈表面抛光后，辐射仍然是堆栈内部的主要传热机制，从而将辐射率降低至0.2。此外，灵敏度研究指出了最佳的系统绝缘厚度，可以平衡整个系统体积和总传导热损失。

著录项

  • 来源
    《Journal of power sources》 |2011年第15期|p.6347-6355|共9页
  • 作者

    KJ. Kattke; R.J. Braun;

  • 作者单位

    Division of Engineering, Colorado School of Mines. 1610 Illinois Street. Co/den, CO. USA;

    Division of Engineering, Colorado School of Mines. 1610 Illinois Street. Co/den, CO. USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    sofc; system analysis; modeling; tubular stack; parametric study; cfd;

    机译：sofc;系统分析;造型;管状堆叠参数研究cfd;

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