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Title: Effect of Operation Parameters on the Thermal Characteristics in a Planar Solid Oxide Fuel Cell
题目：运行参数对平板式固体氧化物燃料电池热特性的影响
Authors: WANG Mingyuan, WANG Ke, WANG Yongqing, CHEN Jiangshuai, AN Bo, TU Shantung
作者：王明远，王珂，王永庆，陈姜帅，安博，涂善东
单位：郑州大学力学与安全工程学院，郑州大学河南省过程传热与节能重点实验室，郑州大学机械与动力工程学院，华东理工大学承压系统与安全教育部重点实验室
Journal of Thermal Science, 2024, 33(5): 1974-1989.
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摘要
Abstract: Effective operation strategies in the solid oxide fuel cell (SOFC) can adjust the spatial distribution of temperature gradient favoring the long-term stability. To investigate the effects of different operating conditions on the thermal behavior inside SOFC, a three-dimensional model is developed in this study. The model is verified by comparing it with the experimental data. The heat generation rate and its variation under different operating conditions are analyzed. The combined effects of operating voltage and gas temperature are considered to be the key factor influencing the temperature gradient. Compared to the original case, the temperature of SOFC decreases by 21.4 K when the fuel velocity reaches 5 m/s. But the maximum temperature gradient increases by 21.2%. Meanwhile, higher fuel velocities can eliminate about 32% of the area with higher temperature gradient. And when the oxidant velocity reaches 7.5 m/s, the peak temperature gradient effectively decreases by 16.59%. Simultaneous adjustment of the oxidant and fuel velocities can effectively reduce the peak temperature gradient and increase the safety zone. The effects of operation conditions on the temperature gradient of the cell are clarified in this study, which can be a reference for further research on the reliability of SOFCs.
摘要：充分破坏煤炭中的芳香环结构是减少污染物排放的关键。本工作应用立式管式炉实验台，对神木煤粉进行了活化反应研究。通过改变活化气氛中H2O与CO2的比例，研究活化过程中碳共价键的演化机制并通过密度泛函理论进行验证。两种气体分子遵循不同的途径来增强碳的反应性：CO2主要通过参与交联反应，而H2O和煤粉的吸附能垒较低，更容易生成含氧官能团。气体分子在混合气体气氛中存在活性位点的竞争，但两者之间存在协同作用。这种协同作用可以归结为两种可能性：H2O的加入在一定程度上减缓了五元环的生成，同时促进了含氧官能团的生成；引入含氧官能团可以有效减少气体分子与碳之间相互作用的吸附能垒。
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引用格式
WANG Mingyue, ZHANG Siyuan, HAN Shaobo, ZHANG Chi, REN Qiangqiang, Evolution Mechanism of Carbon Covalent Bond during Coal Activation Using Mixed Atmosphere of H2O and CO2, Journal of Thermal Science, 2024, 33(5): 1961-1973.
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