The combination of concentrated solar power–chemical looping air separation (CSP-CLAS) with an oxy-fuel combustion process for carbon dioxide (CO₂) capture is a novel system to generate electricity from solar power and biomass while being able to store solar power efficiently. In this study, the computer program Advanced System for Process Engineering Plus (ASPEN Plus) was used to develop models to assess the process performance of such a process with manganese (Mn)-based oxygen carriers on alumina (Al₂O₃) support for a location in the region of Seville in Spain, using real solar beam irradiance and electricity demand data. It was shown that the utilisation of olive tree prunings (Olea europaea) as the fuel—an agricultural residue produced locally—results in negative CO₂ emissions (a net removal of CO₂ from the atmosphere). Furthermore, it was found that the process with an annual average electricity output of 18 MW would utilise 2.43% of Andalusia’s olive tree prunings, thereby capturing 260.5 k-tonnes of CO₂, annually. Drawbacks of the system are its relatively high complexity, a significant energy penalty in the CLAS process associated with the steam requirements for the loop-seal fluidisation, and the gas storage requirements. Nevertheless, the utilisation of agricultural residues is highly promising, and given the large quantities produced globally (~ 4 billion tonnes/year), it is suggested that other novel processes tailored to these fuels should be investigated, under consideration of a future price on CO₂ emissions, integration potential with a likely electricity grid system, and based on the local conditions and real data.

中文翻译：

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模拟一个100兆瓦的太阳能热化学空气分离系统与一个含氧燃料发电厂相结合的生物能源，并具有碳捕集与封存（BECCS）

集中式太阳能-化学循环空气分离（CSP-CLAS）与氧气燃料燃烧过程中的二氧化碳（CO ₂）捕集相结合，是一种新颖的系统，可从太阳能和生物质发电，同时能够存储太阳能有效率的。在这项研究中，使用计算机程序Advanced System for Process Engineering Plus（ASPEN Plus）来开发模型，以评估在氧化铝（Al ₂ O ₃）上以锰（Mn）为基础的氧载体对这种工艺的工艺性能。利用实际的太阳光束辐照度和电力需求数据，将其定位在西班牙塞维利亚地区。结果表明，利用橄榄树修剪（油橄榄））作为燃料（当地产生的农业残留物）导致负CO ₂排放（从大气中净清除CO ₂）。此外，还发现，年平均发电量为18兆瓦的过程将利用安达卢西亚橄榄树修剪的2.43％，从而捕获26.05万吨的CO ₂， 每年。该系统的缺点是其相对较高的复杂性，在CLAS工艺中的巨大能量损失，与回路密封流化所需的蒸汽以及气体存储要求有关。尽管如此，利用农业残留物还是很有前途的，鉴于全球产量大（约40亿吨/年），建议在考虑未来CO价格的同时，研究针对这些燃料量身定制的其他新颖工艺。₂排放，与可能的电网系统整合的潜力，并基于当地条件和真实数据。