Study of Gas-steam Combined Cycle Power Plants Integrated with MCFC for Carbon Dioxide Capture☆

Study of Gas-steam Combined Cycle Power Plants Integrated with MCFC for Carbon Dioxide Capture☆
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DOI：
10.1016/j.egypro.2014.01.121
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发表时间：
2014
期刊：
Energy Procedia
影响因子：
--
通讯作者：
R. Carapellucci;R. Saia;L. Giordano
R. Carapellucci;R. Saia;L. Giordano
中科院分区：
其他
文献类型：
--
作者：
R. Carapellucci;R. Saia;L. Giordano

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在基于化石燃料的技术领域，天然气联合循环（NGCC）发电厂目前是发电的最佳选择，效率接近60%。然而，它们会产生大量的二氧化碳排放，新安装的二氧化碳排放量约为0.4吨/兆瓦时。在碳捕获和封存（CCS）技术中，基于化学吸收的过程是一种成熟的技术，但明显降低了NGCC的性能。另一方面，熔融碳酸盐燃料电池（MCFC）的集成被认为是克服传统CCS技术主要缺点的有吸引力的选择。如果阴极侧由NGCC废气供给，MCFC除了提供额外的发电能力外还作为CO2浓缩器运行。为了提高MCFC的效率及其在NGCC内的集成，基于两种不同的气体再循环方案的工厂配置进行了分析。第一种是在压缩机入口处的废气的传统再循环;第二种主要涉及MCFC堆，基于在阴极入口处再循环一部分阳极废气。评价了MCFC运行条件对系统能量和环境性能的影响。
In the field of fossil-fuel based technologies, natural gas combined cycle (NGCC) power plants are currently the best option for electricity generation, having an efficiency close to 60%. However, they produce significant CO2 emissions, amounting to around 0.4 tonne/MWh for new installations. Among the carbon capture and sequestration (CCS) technologies, the process based on chemical absorption is a well-established technology, but markedly reduces the NGCC performances. On the other side, the integration of molten carbonate fuel cells (MCFCs) is recognized as an attractive option to overcome the main drawbacks of traditional CCS technologies. If the cathode side is fed by NGCC exhaust gases, the MCFC operates as a CO2 concentrator, beside providing an additional generating capacity.In this paper the integration of MCFC into a two pressure levels combined cycle is investigated through an energy analysis. To improve the efficiency of MCFC and its integration within the NGCC, plant configurations based on two different gas recirculation options are analyzed. The first is a traditional recirculation of exhaust gases at the compressor inlet; the second, mainly involving the MCFC stack, is based on recirculating a fraction of anode exhaust gases at the cathode inlet. Effects of MCFC operating conditions on energy and environmental performances of the integrated system are evaluated.