固体氧化物燃料电池Cu/Ni-LSCM阳极中<i>n</i>(Cu)/<i>n</i>(Ni)对碳沉积影响数值模拟研究

摘要固体氧化物燃料电池(SOFC)使用碳氢化合物为燃料时,多孔阳极易出现严重的积碳的现象,导致阳极催化活性降低,电池功率密度下降以及电池寿命急剧衰减。铬酸镧基钙钛矿材料在高温氧化和还原气氛下具有较好的稳定性、电催化活性和抗积碳性能。建立LSCM以及Cu/Ni-LSCM中CH₄与CO₂干重整动力学模型,模型耦合了动量传递、质量传递、化学反应动力学、域微分方程以及气体在多孔介质中的传质模型,并利用该模型研究了Cu/Ni-LSCM阳极材料的抗积碳性能、催化活性以及孔隙率随时间的变化情况。得出结论:Cu的引入可以明显降低碳沉积速率,在一定基础上增加燃料转化率。其中CH₄热分解是形成积碳的主要原因。与此同时,模拟结果显示阳极燃料入口处为碳沉积最为严重的区域。

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	王彬
	于洁
	康丁文
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	吕国强
	马文会

关键词： SOFC阳极材料 Cu/Ni-LSCM 碳沉积数值模拟

Abstract： When the solid oxide fuel cell (SOFC) uses hydrocarbons as fuel, the porous anode is prone to serious carbon deposition, resulting in the decrease of anode catalytic activity, the decrease of cell power density and the sharp attenuation of cell life. Lanthanum chromate-based perovskite materials have good stability, electrocatalytic activity and carbon deposition resistance under high temperature oxidation and reduction atmosphere. A kinetic model of dry reforming of methane and carbon dioxide in LSCM and Cu/Ni-LSCM was established, which coupled momentum transfer, mass transfer, chemical reaction kinetics, domain differential equation and gas mass transfer model in porous media. The carbon deposition resistance, catalytic activity and porosity of Cu/Ni-LSCM anode materials were studied using the model. It is concluded that the introduction of Cu can significantly reduce the carbon deposition rate and increase the fuel conversion rate on a certain basis. The thermal decomposition of methane is the main cause of carbon deposition. At the same time, the simulation results show that the anode fuel inlet is the most serious carbon deposition area.

Keywords： solid oxide fuel cell (SOFC) anode material Cu/Ni-LSCM carbon deposition numerical simulation

Received 2021-07-21;

Fund:国家自然科学基金资助项目(50764028);云南省重点科技计划资助项目(201902B080005)。

Corresponding Authors: 于洁,教授,E-mail:kgyujie@kust.edu.cn。 Email: kgyujie@kust.edu.cn

About author: 王彬(1994-),男,硕士研究生,现从事固体氧化物燃料电池数值模拟方向的研究。

引用本文:

王彬, 于洁, 康丁文, 刘辉, 乔翠, 吕国强, 马文会.固体氧化物燃料电池Cu/Ni-LSCM阳极中n(Cu)/n(Ni)对碳沉积影响数值模拟研究[J]. 化学工业与工程, 2022,39(3): 89-97

WANG Bin, YU Jie, KANG Dingwen, LIU Hui, QIAO Cui, LYU Guoqiang, MA Wenhui.Numerical simulation on the effect of n(Cu)/n(Ni) ratio in solid oxide fuel cell Cu/Ni-LSCM anode on carbon deposition[J]. Chemcial Industry and Engineering, 2022,39(3): 89-97

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