Syngas fuel such as hydrogen and carbon monoxide generated by solar energy is a promising method to use solar energy and overcome its fluctuation effectively.This study proposes a combined cooling,heating,and power sy...Syngas fuel such as hydrogen and carbon monoxide generated by solar energy is a promising method to use solar energy and overcome its fluctuation effectively.This study proposes a combined cooling,heating,and power system using the reversible solid oxide fuel cell assisted by solar energy to produce solar fuel and then supply energy products for users during the period without solar radiation.The system runs a solar-assisted solid oxide electrolysis cell mode and a solid oxide fuel cell mode.The thermodynamic models are constructed,and the energetic and exergetic performances are analyzed.Under the design work conditions,the SOEC mode’s overall system energy and exergy efficiencies are 19.0%and 20.5%,respectively.The electrical,energy and exergy efficiencies in the SOFC mode are 51.4%,71.3%,and 45.2%,respectively.The solid oxide fuel cell accounts for 60.0%of total exergy destruction,caused by the electrochemical reactions’thermodynamic irreversibilities.The increase of operating temperature of solid oxide fuel cell from 800℃to 1050℃rises the exergy and energy efficiencies by 11.3%and 12.3%,respectively.Its pressure from 0.2 to 0.7 MPa improves electrical efficiency by 13.8%while decreasing energy and exergy efficiencies by 5.2%and 6.0%,respectively.展开更多
分布式冷热电联供(combined cooling,heating and power,CCHP)系统是一种小型、临近用户的新型供能方式,可避免能量长距离传输过程损失,同时具有灵活、高效、环保特点,成为大规模、集中式供能方式的重要补充。中小型发电装置是分布式冷...分布式冷热电联供(combined cooling,heating and power,CCHP)系统是一种小型、临近用户的新型供能方式,可避免能量长距离传输过程损失,同时具有灵活、高效、环保特点,成为大规模、集中式供能方式的重要补充。中小型发电装置是分布式冷热电联供系统的核心,制冷和制热也都围绕发电装置余热展开。对适合分布式冷热电联供系统的2类中小型发电装置的基本工作原理、热力性能和相关研究进展进行综述。一类是以化石燃料为能源输入的中小型发电装置,包括微型燃气轮机、燃气内燃机、小型燃气轮机和燃料电池;另一类是以发电装置余热或太阳能集热等其他热源为能源输入的中小型发电装置,包括有机朗肯循环、正逆耦合循环、热声发电机等。最后,对2类中小型发电装置的优缺点进行对比分析,为分布式供能系统的发电装置选型、系统方案设计等提供参考。展开更多
提出耦合太阳能的固体氧化物燃料电池–微燃机–冷热电联供系统(solid oxide fuel cell-micro gas turbine-combined cooling,heating and power system,SOFC-MGT-CCHP),建立SOFC-MGT-CCHP系统与太阳能热水系统模型,并将二者耦合。以某...提出耦合太阳能的固体氧化物燃料电池–微燃机–冷热电联供系统(solid oxide fuel cell-micro gas turbine-combined cooling,heating and power system,SOFC-MGT-CCHP),建立SOFC-MGT-CCHP系统与太阳能热水系统模型,并将二者耦合。以某旅馆用户为例,根据不同季节用能特点提出3种典型运行策略。并根据以电定热、以热定电以及是否耦合太阳能等系统运行方式进行对比研究,研究结果表明:耦合太阳能的SOFC-MGT-CCHP系统按照以热定电方式运行最为节能。在满足用户用能需求情况下,相较于不利用太阳能的以热定电运行方式,系统日均一次能源节约率、一次能源利用率、CO_(2)减排率最高提升2.88%、14.2%、3.76%;相比于不利用太阳能的以电定热运行方式,三者最高分别提升26.31%、83.05%、26.53%。展开更多
基金supported by the National Natural Science Foundation of China(Grant No.51876064 and 52090064)the Bureau of Shihezi Science&Technology(Grant No.2021ZD02)。
文摘Syngas fuel such as hydrogen and carbon monoxide generated by solar energy is a promising method to use solar energy and overcome its fluctuation effectively.This study proposes a combined cooling,heating,and power system using the reversible solid oxide fuel cell assisted by solar energy to produce solar fuel and then supply energy products for users during the period without solar radiation.The system runs a solar-assisted solid oxide electrolysis cell mode and a solid oxide fuel cell mode.The thermodynamic models are constructed,and the energetic and exergetic performances are analyzed.Under the design work conditions,the SOEC mode’s overall system energy and exergy efficiencies are 19.0%and 20.5%,respectively.The electrical,energy and exergy efficiencies in the SOFC mode are 51.4%,71.3%,and 45.2%,respectively.The solid oxide fuel cell accounts for 60.0%of total exergy destruction,caused by the electrochemical reactions’thermodynamic irreversibilities.The increase of operating temperature of solid oxide fuel cell from 800℃to 1050℃rises the exergy and energy efficiencies by 11.3%and 12.3%,respectively.Its pressure from 0.2 to 0.7 MPa improves electrical efficiency by 13.8%while decreasing energy and exergy efficiencies by 5.2%and 6.0%,respectively.
文摘分布式冷热电联供(combined cooling,heating and power,CCHP)系统是一种小型、临近用户的新型供能方式,可避免能量长距离传输过程损失,同时具有灵活、高效、环保特点,成为大规模、集中式供能方式的重要补充。中小型发电装置是分布式冷热电联供系统的核心,制冷和制热也都围绕发电装置余热展开。对适合分布式冷热电联供系统的2类中小型发电装置的基本工作原理、热力性能和相关研究进展进行综述。一类是以化石燃料为能源输入的中小型发电装置,包括微型燃气轮机、燃气内燃机、小型燃气轮机和燃料电池;另一类是以发电装置余热或太阳能集热等其他热源为能源输入的中小型发电装置,包括有机朗肯循环、正逆耦合循环、热声发电机等。最后,对2类中小型发电装置的优缺点进行对比分析,为分布式供能系统的发电装置选型、系统方案设计等提供参考。
文摘提出耦合太阳能的固体氧化物燃料电池–微燃机–冷热电联供系统(solid oxide fuel cell-micro gas turbine-combined cooling,heating and power system,SOFC-MGT-CCHP),建立SOFC-MGT-CCHP系统与太阳能热水系统模型,并将二者耦合。以某旅馆用户为例,根据不同季节用能特点提出3种典型运行策略。并根据以电定热、以热定电以及是否耦合太阳能等系统运行方式进行对比研究,研究结果表明:耦合太阳能的SOFC-MGT-CCHP系统按照以热定电方式运行最为节能。在满足用户用能需求情况下,相较于不利用太阳能的以热定电运行方式,系统日均一次能源节约率、一次能源利用率、CO_(2)减排率最高提升2.88%、14.2%、3.76%;相比于不利用太阳能的以电定热运行方式,三者最高分别提升26.31%、83.05%、26.53%。
