共查询到19条相似文献,搜索用时 62 毫秒
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固体氧化物燃料电池具有高能量密度、适用多种不同燃料、结构简单等优点,与燃气轮机结合后能达到近80%的能量利用效率,具有良好的市场前景.本文介绍了固体氧化物燃料电池与燃汽轮机混合系统的结构,应用现状,给出了未来发展的一些方向,并提出了固体氧化物燃料电池与燃气轮机混合系统发展需要解决的一些问题. 相似文献
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固体氧化物燃料电池(SOFC)是一种高效低污染的新型能源。建立了以天然气为燃料的固体氧化物燃料电池和燃气轮机(GT)联合发电系统的计算模型,并对具体系统进行计算。结果表明:SOFC与GT组戍的联合发电系统,发电效率可达68%(LHV);加上利用的余热,整个系统的能量利用率可以超过80%。文中还分析了SOFC的工作压力、电流密度等参数对系统性能的影响,提高工作压力,可以增加电池发电量,提高系统的发电效率;而电流密度的增大将使SOFC及整个系统的发电量降低。 相似文献
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固体氧化物燃料电池简介 总被引:1,自引:0,他引:1
1技术特征与传统的火力发电技术不同,燃料电池是通过电化学反应方式将燃料中的化学能直接转化为电能的发电装置。由于不经过高温燃烧,是化学能转变为热能的过程,不受卡诺循环效率的制约,所以燃料电池的能量转化效率非常高。单位发电量所需燃料 相似文献
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利用流体力学计算软件FLUENT建立平板状固体氧化物燃料电池(SOFC)三维数值模型,研究在不同操作条件和支撑形式下,活化极化、欧姆极化、浓度极化对SOFC性能的影响。在多孔电极中的气体流动符合达西定律的前提下,为满足不同的多孔电极设计,综合考虑了摩尔扩散和Knudsen扩散。另外还考虑了电池电化学反应热对欧姆极化的影响。分析结果表明,阴极和阳极支撑固体氧化物燃料电池具有较低的操作温度和较好的输出特性。 相似文献
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固体氧化物燃料电池(Solid Oxide Fuel Cell,SOFC)具有多输入多输出、强耦合的特点,为了使其输出电压稳定设计了高效控制器,采用神经模糊控制方法对其输出电压进行控制。通过机理分析和实验数据拟合方法分别建立SOFC的机理模型和神经网络模型,在此基础上采用模糊控制策略对SOFC的输出电压进行控制,并应用神经模糊控制方法进一步提高了控制精度。通过MATLAB/Simulink仿真实验发现,SOFC神经网络模型得到的预测电压与实际电压之间的误差小于0.008 V,较其机理模型更加准确,所提出的控制策略能有效控制SOFC的输出电压。 相似文献
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Andrea Bedon Jean Paul Viricelle Mathilde Rieu Simone Mascotto Antonella Glisenti 《International Journal of Hydrogen Energy》2021,46(27):14735-14747
In this contribution brownmillerite-based nanocomposite cathode for Single-Chamber Solid Oxide Fuel Cells is developed. These cells can be very attractive especially for small and cheap devices because of the absence of seals. The efficiency of SC-SOFCs is strictly connected to the selectivity of anode and cathode, the bottleneck for this technology. The development of a cathode inert in fuel oxidation is particularly challenging. Our strategy is to start from a catalytically un-active support (CFA = Ca2FeAl0.95Mg0.05O5) and induce the formation of iron oxide based nanoparticles, expected to activate oxygen. Symmetric (CFA + FeOx/CGO/CFA + FeOx) and complete cells (CFA + FeOx/CGO/Ni-CGO) are studied in air and methane/oxygen 2:1 mixture. The Area Specific Resistance of CFA + FeOx is less than 1/3 that of CFA. The high selectivity allows to reach an efficiency of 25%; power still needs to be increased but we demonstrated the possibility to develop selective low cost electrodes. The effect of air, methane/oxygen exposure and the heat treatments were carefully investigated. 相似文献
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《International Journal of Hydrogen Energy》2019,44(21):10925-10932
The paper presents a comparison of the models currently used in relation to the available experimental data. The review highlights the main causes of discrepancies between the results of modeling and experimental data. The models are based on factors that have no physical interpretation and are used only as “fitting parameters”. This hampers use of these models in simulations on states other than those that prevailed during the experiments for which the coefficients were determined. 相似文献
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以燃料重整的固体氧化物燃料电池发电系统为研究对象,通过数值模拟方法对固体氧化物燃料电池发电系统的性能、(火用)损、(火用)效率以及多变量运行参数优化进行了分析。研究结果表明:重整反应中燃料利用系数、电池工作温度、水碳比、电堆电流密度等参数对系统性能影响显著;电堆工作在不同电流密度下都有其对应的最佳工作温度、最佳燃料利用系数工况点;水碳比会改变重整反应产氢量,从而影响电化学反应速率,空气加热器的(火用)损所占份额最大;优化后的系统效率及(火用)效率为0.480 9和0.462 6,效率提升约4%。 相似文献
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Apart from natural gas there is another important natural source of methane. The so-called coal mine gas is a by-product of the geochemical process of the carbonization of sediments from marsh woods of the Earth's Carboniferous Period. Methane evaporates from the coal and has to be removed out of the active mines where it represents one of the main safety risks. Methane also evaporates in abandoned coal mines. In the federal state Saarland in Germany exists above ground a more than 110 km pipeline for the drained coal mine gas from 12 different sources. The content of methane varies between 25 and 90%, the oxygen content (from air) is in the range up to 10%. This wide range or variation, respectively, of fuel and oxygen content, causes a lot of problems for the use in conventional engines. Therefore the company Evonik New Energies GmbH is interested in using SOFC with coal mine gas as efficient as possible to produce electric power. For that purpose at Forschungszentrum Jülich the available SOFC technology was adapted to the use with coal mine gas and a test facility was designed to operate an SOFC stack (approximately 2 kW electrical power output) together with a pre-reformer.This paper presents the results of the coal mine gas analysis and the effect on the pre-reformer and the fuel cell. The composition of the coal mine gas was determined by means of micro-gas chromatography. The results obtained from preliminary tests using synthetic and real coal mine gas on the pre-reformer and on the fuel cell are discussed. 相似文献
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直接碳燃料电池(Direct Carbon Fuel Cell,DCFC)能够直接将固体碳燃料中的化学能高效、清洁地转化为电能,对煤炭的合理利用、污染物控制以及CO2减排具有重要意义。目前已开发出以熔融碳酸盐、熔融氢氧化物和固体氧化物作为电解质的多种DCFC,但与其它燃料电池技术相比,研究尚处于起步阶段。本文综述了DCFC技术的发展历程及研发现状,对现有DCFC加以分类,分析比较了其各自工作机理、性能特点以及在CO2减排方面的特性。在总结各类DCFC所面临的技术难题基础上,展望了直接碳燃料电池技术今后可能的发展方向。 相似文献