基于三元催化剂的固体氧化物燃料电池尾气催化燃烧数值模拟  

Numerical Simulation of Solid Oxide Fuel Cell Tail Gas Catalytic Combustion Based on Three-Way Catalyst

作　　者：龚思琦 云再鹏 许明 敖乐 李初福 黄凯 孙晨 GONG Siqi;YUN Zaipeng;XU Ming;AO Le;LI Chufu;HUANG Kai;SUN Chen(National Institute of Clean-and-Low-Carbon Energy,Changping District,Beijing 102209,China;CHN Energy Guohua Bayannur(Ullatzhongqi)Wind Power Co.,Ltd.,Bayannur 015000,Inner Mongolia Autonomous Region,China)

机构地区：[1]北京低碳清洁能源研究院,北京市昌平区102209 [2]国家能源集团国华巴彦淖尔(乌拉特中旗)风电有限公司,内蒙古自治区巴彦淖尔市015000

出　　处：《发电技术》2024年第2期331-340,共10页Power Generation Technology

基　　金：国家重点研发计划项目(2017YFB0601900)。

摘　　要：固体氧化物燃料电池(solid oxide fuel cell,SOFC)作为一种清洁高效的先进发电设备,具有空气、燃料气分离的结构优势,易于将燃料侧尾气中的CO_(2)富集。为提高SOFC阳极尾气中CO_(2)浓度,针对商业化的三元催化剂,综合考虑SOFC阳极尾气催化燃烧中传质、传热、化学反应过程,建立多物理场耦合稳态模型。基于该模型,模拟SOFC系统阳极尾气的催化燃烧特性,研究不同入口温度、反应空速和催化剂尺寸对燃烧温度、壁面温度、H_(2)转化率、CO转化率、出口CO_(2)浓度等参数的影响,得到各参数的变化趋势。借鉴已有实验,通过优化空速,可以将出口CO_(2)浓度从94.72%提高至95.33%;通过优化催化剂尺寸,可以将出口CO_(2)体积分数从94.72%提高至95.64%。通过分析尾气催化燃烧中不同工况下的出口CO_(2)浓度变化特性,为商业三元催化剂用于SOFC系统阳极尾气催化转化和尾气CO_(2)富集提供指导。As a clean and efficient advanced power generation equipment,the solid oxide fuel cell(SOFC) has the structural advantages of separation of air and fuel gas,which makes it easy to enrich the CO_(2) in the tail gas of the fuel side.In order to improve the CO_(2) concentration in SOFC anode tail gas,a steady-state multi-physical coupled model was established for the commercial three-way catalysts,considering the mass transfer,heat transfer,and chemical reaction processes in the catalytic combustion of SOFC anode tail gas.Based on this model,the catalytic combustion characteristics of SOFC anode tail gas were simulated.The effects of different inlet temperature,reaction space velocities and catalyst sizes on combustion temperature,wall temperature,H_(2) conversion,CO conversion and outlet CO_(2) concentration were studied,and the change trend of each parameter was obtained.Based on the existing experiments,the outlet CO_(2) volume fraction could be increased from 94.72% to 95.33% by optimizing the space velocity,and the outlet CO_(2) concentration could be increased from 94.72% to 95.64% by optimizing the catalyst size.By analyzing the variation characteristics of outlet CO_(2) concentration under different working conditions in the catalytic combustion of tail gas,the guidance for the commercial three-way catalyst to be used in the catalytic conversion of anode tail gas and CO_(2enrichment) in the tail gas of SOFC system was provided.

关 键 词：碳排放 碳捕集 三元催化剂 固体氧化物燃料电池(SOFC) 数值模拟 

分 类 号：TK16[动力工程及工程热物理—热能工程]