固体氧化物燃料电池和分部加热式S-CO2循环联合发电系统设计与分析
Design and Analysis of Solid Oxide Fuel Cell and Partial Heating S-CO2 Combined Power Generation System
马悦 1王哲 1曹梦龙 1姜悦茂 2纪玉龙 1韩凤翚1
作者信息
- 1. 大连海事大学轮机工程学院,辽宁省 大连市 116000
- 2. 叶轮机械研究所(西安交通大学能源与动力工程学院),陕西省 西安市 710049
- 折叠
摘要
固体氧化物燃料电池(solid oxide fuel cell,SOFC)与余热回收相结合可进一步提高系统能量转换效率.该文设计一种 SOFC 与分部加热式超临界二氧化碳(partial heating supercritical CO2 Brayton cycle,PHSCBC)动力循环集成系统,SOFC 系统的出口废气作为高温热源,驱动 PHSCBC进行联合发电.建立系统的电化学模型和热力学模型,对系统的能量和㶲进行综合评价,并通过参数分析,研究汽碳比、燃料流量、压缩机进口温度和压力以及夹点温差对联合发电系统性能的影响.对系统性能进行优化,发现当系统燃料流量为0.54 mol/s、空气流量为6.19 mol/s,可达到净发电功率、发电效率、㶲效率分别为260.08 kW、61.20%、56.54%,其中提高燃料流量将显著提高系统发电效率.所提出的混合系统具有高效、低成本和清洁的发电和供热性能,是一种具有实际应用前景的先进能量转换技术.
Abstract
The combination of solid oxide fuel cell(SOFC)and waste heat recovery technology can further improve the energy conversion efficiency of the system.In this study,a hybrid system combining SOFCs with a partial heating supercritical CO2 Brayton cycle(PHSCBC)is designed,where the exhaust gas from the SOFC system serves as a high-temperature heat source to drive the PHSCBC for co-generation.Electrochemical and thermodynamic models are established to comprehensively evaluate the energy and exergy of the integrated system.Through parameter analysis,the impact of the steam-to-carbon ratio,fuel flow rate,compressor inlet temperature and pressure,and pinch point temperature difference on the performance of the co-generation system is investigated.The system performance is optimized,and it is found that with a fuel flow rate of 0.54 mol/s and an air flow rate of 6.19 mol/s,the net power output,electrical efficiency,and exergy efficiency can reach 260.08 kW,61.20%,and 56.54%,respectively.Increasing the fuel flow rate has proven beneficial in significantly enhancing the system's electrical efficiency.The proposed hybrid system demonstrates efficient,cost-effective,and clean co-generation capabilities,making it a promising advanced energy conversion technology with practical application prospects.
关键词
固体氧化物燃料电池/分部加热式S-CO2动力循环/联合发电/余热回收/性能优化Key words
solid oxide fuel cell/partial heating supercritical CO2 Brayton cycle/combined power generation/waste heat recovery/performance optimization引用本文复制引用
基金项目
国家重点研发计划项目(2023YFB4301705)
中央高校基本科研业务费专项资金项目(3132024216)
出版年
2024
国家科技期刊平台
NSTL
万方数据