开路状态下固体氧化物电解槽制备合成气的模型设计与验证
Design and verification of model for syngas production in solid oxide electrolytic cell in open circuit state
高颖 1张涛 1李青山 1孙元娜 1李植 1王涛 1王俊勃 1刘江南1
作者信息
- 1. 西安工程大学 材料工程学院,陕西 西安 710048
- 折叠
摘要
固体氧化物电解槽(SOEC)可将H2O和CO2通过共电解转化为合成气(H2和CO),从而实现CO2的捕集与利用.然而,除了电化学反应,反应气体在高温下的逆水汽反应(RWGS反应)对该过程也存在一定影响.为了探究RWGS反应在合成气制备中的作用,建立了一种纽扣型SOEC在开路状态下制备合成气的二维模型,研究了开路状态下进气组分和操作温度对SOEC支撑层中RWGS反应的影响.将模型仿真结果与实验数据进行对比验证,确保了模型的可靠性.结果表明,入口气体中还原性气体H2含量(物质的量分数,下同)是影响RWGS反应速率的首要因素,H2含量越高,RWGS反应速率越快.当H2含量为30%时,CO2转化率在29%以上;当H2含量为10%时,CO2转化率仅为9%～10%.此外,在H2含量一定的情况下,RWGS反应速率主要与CO2含量呈正相关,在入口气体中提高CO2或者H2含量,可不同程度提高开路状态下的CO2转化率.更高的操作温度有利于RWGS反应更快进行,且在H2含量一定的情况下,进气组分中CO2含量越高,RWGS反应速率的变化率也越大.
Abstract
Solid oxide electrolysis cell(SOEC)can convert H2O and CO2 into syngas(H2 and CO)through co-electrolysis,thereby achieving the capture and utilization of CO2.However,in addition to electrochemical reactions,the reverse water gas shift(RWGS reaction)of the reaction gas at high temperatures also has a certain impact on the process.In order to investigate the role of RWGS reaction in synthesis gas preparation,a two-dimensional model of button-type SOEC for syngas preparation in open circuit state was established.The effects of inlet gas composition and operating temperature on RWGS reaction in the support layer of SOEC in open circuit state were studied.The simulation results of the model were compared and verified with experimental data to ensure the reliability of the model.The results indicate that the content(mole fraction,the same below)of reducing gas H2 in the inlet gas is the primary factor affecting the RWGS reaction rate.The higher the H2 content,the faster the RWGS reaction rate.When the H2 content is 30%,the CO2 conversion rate is above 29%.When the H2 content is 10%,the CO2 conversion rate is only 9%to 10%.In addition,when the H2 content is constant,the reaction rate of RWGS is mainly positively correlated with the CO2 content.Increasing the CO2 or H2 content in the inlet gas can improve the CO2 conversion rate in the open circuit state to varying degrees.A higher operating temperature is conducive to faster RWGS reaction,and under a constant H2 content,the higher the CO2 content in the inlet gas,the greater the rate of change in RWGS reaction rate.
关键词
固体氧化物电解槽/共电解模型/逆水汽反应/合成气Key words
solid oxide electrolytic cell/co-electrolysis model/reverse water gas shift reaction/syngas引用本文复制引用
基金项目
国家自然科学基金(22109124)
陕西省重点研发计划(2024SF-YBXM-431)
陕西省重点研发计划(2024GX-YBXM-463)
陕西省青年人才托举计划(20210421)
西安市纺织复合材料重点实验室科技指导性项目(xafzfczd05)
陕西省技术创新引导计划(2024QCY-KXJ-021)
陕西省科技厅三项改革项目(2024ZC-YYDP-17)
国家级大学生创新创业训练计划(S202310709111)
国家级大学生创新创业训练计划(S202310709023)
出版年
2024
国家科技期刊平台
NSTL
万方数据