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Techno-economic and exergetic assessment of an oxy-fuel power plant fueled by syngas produced by chemical looping CO2 and H2O dissociation
Journal of CO2 Utilization ( IF 7.7 ) Pub Date : 2018-09-08 , DOI: 10.1016/j.jcou.2018.09.001
Azharuddin Farooqui , Archishman Bose , Domenico Ferrero , Jordi Llorca , Massimo Santarelli

Natural Gas Combined Cycle (NGCC) is presently the most efficient fossil fuel power plant but with no carbon capture. The efficiency penalty resulting from the integration of carbon capture and storage (CCS) is, however, a major challenge. The present study proposes an oxyfuel NGCC integrated with Chemical looping (CL) syngas production (OXY-CC-CL), for power generation with CCS. The chemical looping CO2/H2O dissociation would produce syngas (CO and H2 with methane reduction step in redox cycle) from recycled exhaust gas for additional power generation within the power plant. This integration of CL unit with the existing conventional oxy fuel power plant would be expected to decrease the efficiency penalty. Therefore, the thermodynamic (both energetic and exergetic), economic and environmental performance of the integrated chemical looping unit oxyfuel NGCC power plant with carbon capture were assessed. A 500 MW scale plant was modelled and compared with a conventional NGCC and oxyfuel NGCC plant with carbon capture (OXY-CC). The net efficiency penalty of the proposed OXY-CC-CL unit was 4.2% compared to an efficiency penalty of 11.8% of the OXY-CC unit with a 100% carbon capture. The energetic efficiency obtained hence was 50.7%, together with an exergetic efficiency of 47.1%. Heat integration via pinch analysis revealed the possibility to increase the system energetic efficiency up to 61%. Sensitivity analyses were performed to identify relative impacts of system operational parameters. The specific capital cost of the proposed OXY-CC-CL was obtained as 2455 $/kW, with a corresponding LCOE of 128 $/MWh without carbon credits.



中文翻译:

对由CO 2和H 2 O分解产生的合成气供能的氧气燃料发电厂的技术经济和充分的评估

天然气联合循环(NGCC)是目前效率最高的化石燃料发电厂,但没有碳捕集。但是,由于碳捕集与封存(CCS)的集成而导致的效率下降是一个重大挑战。本研究提出了一种与化学循环(CL)合成气生产(OXY-CC-CL)集成在一起的含氧燃料NGCC,用于CCS发电。化学回路中的CO 2 / H 2 O解离会产生合成气(CO和H 2氧化还原循环中的甲烷还原步骤)从回收的废气中获取,用于发电厂内的其他发电。CL单元与现有的常规含氧燃料发电厂的这种集成将减少效率损失。因此,评估了具有碳捕获功能的一体化化学回路装置富氧NGCC电厂的热力学(能量和能量),经济和环境性能。对一个500兆瓦规模的工厂进行建模,并将其与具有碳捕集(OXY-CC)的常规NGCC和富氧NGCC工厂进行比较。提议的OXY-CC-CL装置的净效率损失为4.2%,而碳捕获率为100%的OXY-CC-CL装置的效率损失为11.8%。因此获得的能量效率为50.7%,并且能量效率为47.1%。通过夹点分析进行的热集成揭示了将系统能量效率提高到61%的可能性。进行敏感性分析以识别系统操作参数的相对影响。拟议的OXY-CC-CL的特定资本成本为2455 $ / kW,对应的LCOE为128 $ / MWh(无碳信用额)。

更新日期:2018-09-08
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