Portillo E, Gallego Fernández Luz M, Cano M, Alonso-Fariñas B, Navarrete B
Departamento de Ingeniería Química y Ambiental, Escuela Técnica Superior de Ingeniería, Universidad de Sevilla, C/Camino de los Descubrimientos s/n, 41092 Sevilla, Spain.
Membranes (Basel). 2022 Dec 2;12(12):1224. doi: 10.3390/membranes12121224.
The inclusion of membrane-based oxygen-fired combustion in power plants is considered an emerging technology that could reduce carbon emissions in a more efficient way than cryogenic oxygen-fired processes. In this paper, a techno-economic assessment was developed for a 863 MW power plant to demonstrate whether this CCS technique results in a reduction in efficiency losses and economic demand. Four configurations based on oxygen transport membranes were considered, while the benchmark cases were the air combustion process without CO capture and a cryogenic oxygen-fired process. The type of driving force through the membrane (3-end or 4-end), the point of integration into the oxy-fuel combustion process, the heating system, and the pollutant control system were aspects considered in this work. In comparison, the efficiency losses for membrane-based alternatives were lower than those in the cryogenic oxygen-fired process, reaching savings of up to 14% net efficiency. Regarding the specific energy consumption for CO capture, the configuration based on the oxygen transport membrane unit with 4-end mode and hot filtration presented 1.01 kW·h/kg with 100% CO recovery, which is an improvement of 11% compared with the cases using cryogenic oxygen. Comparing economic aspects, the specific investment costs for cases based on the oxygen transport membrane unit varied between 2520 and 2942 $/kW·h. This was between 39.6 and 48.2% above the investment for the reference case without carbon capture. However, its hypothetical implantation could suppose a savings of 10.7% in terms of investment cost compared with cryogenic oxygen-based case. In terms of the levelized cost of electricity and the cost of CO avoidance, the oxygen transport membrane configurations achieved more favorable results compared with the cryogenic route, reaching savings up to 14 and 38%, respectively. Although oxygen transport membrane units are currently not mature for commercial-scale applications, the results indicated that its application within carbon capture and storage technologies can be strongly competitive.
将基于膜的富氧燃烧纳入发电厂被认为是一项新兴技术，它能够以比低温富氧燃烧工艺更高效的方式减少碳排放。本文针对一座863兆瓦的发电厂开展了技术经济评估，以论证这种碳捕集与封存（CCS）技术是否能减少效率损失并降低经济需求。研究考虑了基于氧传输膜的四种配置，同时基准案例为无二氧化碳捕集的空气燃烧过程和低温富氧燃烧过程。本研究考虑的因素包括穿过膜的驱动力类型（三端或四端）、与氧燃料燃烧过程的集成点、加热系统以及污染物控制系统。相比之下，基于膜的替代方案的效率损失低于低温富氧燃烧过程，净效率节省高达14%。关于二氧化碳捕集的特定能耗，基于四端模式和热过滤的氧传输膜装置配置在二氧化碳回收率为100%时为1.01千瓦·时/千克，与使用低温氧气的案例相比提高了11%。在经济方面进行比较，基于氧传输膜装置的案例的特定投资成本在2520至2942美元/千瓦·时之间。这比无碳捕集参考案例的投资高出39.6%至48.2%。然而，与基于低温氧气的案例相比，其假设应用在投资成本方面可能节省10.7%。在平准化度电成本和避免碳排放成本方面，氧传输膜配置相比低温路线取得了更有利的结果，分别节省高达14%和38%。尽管氧传输膜装置目前在商业规模应用方面尚不成熟，但结果表明其在碳捕集与封存技术中的应用具有很强的竞争力。
