Design and performance analysis of a coupled burner for the Solid Oxide Fuel Cell system

IF 9.9 1区工程技术 Q1 ENERGY & FUELS

Energy Conversion and Management Pub Date : 2024-10-24 DOI:10.1016/j.enconman.2024.119181

Baogang Yang , Xianying Hao , Xuesong Shen , Wangying Shi , Yitong Xie , Liang Li

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引用次数: 0

Abstract

The Solid Oxide Fuel Cell (SOFC) system is characterized by high energy conversion efficiency and low emissions. The energy supply and recovery of the SOFC system are facilitated through the ignition burner and the off-gas burner, respectively. This study proposes a coupled design of the ignition burner and the off-gas burner to reduce the burner volume, thereby enhancing the power density of the SOFC system. The ignition burner employs radially opposed jet combustion with fully premixed natural gas, while the off-gas burner uses swirl diffusion combustion with the anode off gas. When the premixed gas and lean anode off gas are unable to sustain the flame, catalytic combustion is initiated. Simulation and experiment methods are utilized to analyze the performance of the coupled burner in this paper. The results indicate that uniform mixing is achieved with a high swirl number (s₁ = 2.6) for the premixed gas, and the maximum excess air coefficient for stable flame combustion at 400 °C is 2.47. As the temperature of the cathode off gas increases, the flameout boundary for the premixed gas gradually increases; conversely, with increasing burner power, the flameout boundary gradually decreases. The intersection cooling effect of mixed air and circumferential high-temperature flue gas is effective, and the flame does not exceed the tolerance temperature of the catalytic carrier. The diffusion combustion of anode off gas with a swirl number (s₂ = 0.5) exhibits great gas mixing uniformity without a high-temperature core region. When transitioning from flame to catalytic combustion with premixed natural gas and anode off gas, there is a temperature lag of approximately 60 s. The isotropic cylindrical cordierite catalytic carrier with a 400 mesh and a coating of 60 g/ft³ Pt_0.1Pd_0.5 achieves stable catalytic combustion in an environment with preheated air temperatures ranging from 400 to 600 °C and H₂ concentrations of 0.25–2.91 %.

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固体氧化物燃料电池系统耦合燃烧器的设计与性能分析

固体氧化物燃料电池（SOFC）系统具有高能量转换效率和低排放的特点。SOFC 系统的能量供应和回收分别通过点火燃烧器和尾气燃烧器实现。本研究提出了一种点火燃烧器和尾气燃烧器的耦合设计，以减小燃烧器的体积，从而提高 SOFC 系统的功率密度。点火燃烧器采用完全预混的天然气进行径向对置喷射燃烧，而废气燃烧器则采用阳极废气进行漩涡扩散燃烧。当预混合气体和贫阳极废气无法维持火焰时，就会启动催化燃烧。本文利用模拟和实验方法分析了耦合燃烧器的性能。结果表明，预混合气体在高漩涡数（s1 = 2.6）条件下实现了均匀混合，400 ℃ 时稳定火焰燃烧的最大过量空气系数为 2.47。随着阴极废气温度的升高，预混合气体的熄火边界逐渐增大；反之，随着燃烧器功率的增加，熄火边界逐渐减小。混合空气和环向高温烟气的交汇冷却作用有效，火焰不会超过催化载体的耐受温度。漩涡数（s2 = 0.5）为 0.5 的阳极废气扩散燃烧表现出很好的气体混合均匀性，没有高温核心区。各向同性圆柱形堇青石催化载体的网目为 400，涂层为 60 g/ft3 Pt0.1Pd0.5，在预热空气温度为 400 至 600 °C、H2 浓度为 0.25 至 2.91 % 的环境中实现了稳定的催化燃烧。

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来源期刊

Energy Conversion and Management 工程技术-力学

CiteScore

19.00

自引率

11.50%

发文量

1304

审稿时长

17 days

期刊介绍： The journal Energy Conversion and Management provides a forum for publishing original contributions and comprehensive technical review articles of interdisciplinary and original research on all important energy topics. The topics considered include energy generation, utilization, conversion, storage, transmission, conservation, management and sustainability. These topics typically involve various types of energy such as mechanical, thermal, nuclear, chemical, electromagnetic, magnetic and electric. These energy types cover all known energy resources, including renewable resources (e.g., solar, bio, hydro, wind, geothermal and ocean energy), fossil fuels and nuclear resources.