Department of Engineering and Public Policy, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, USA.
Environ Sci Technol. 2013 Mar 19;47(6):3006-14. doi: 10.1021/es3050604. Epub 2013 Feb 28.
This study investigates the feasibility of polymer membrane systems for postcombustion carbon dioxide (CO(2)) capture at coal-fired power plants. Using newly developed performance and cost models, our analysis shows that membrane systems configured with multiple stages or steps are capable of meeting capture targets of 90% CO(2) removal efficiency and 95+% product purity. A combined driving force design using both compressors and vacuum pumps is most effective for reducing the cost of CO(2) avoided. Further reductions in the overall system energy penalty and cost can be obtained by recycling a portion of CO(2) via a two-stage, two-step membrane configuration with air sweep to increase the CO(2) partial pressure of feed flue gas. For a typical plant with carbon capture and storage, this yielded a 15% lower cost per metric ton of CO(2) avoided compared to a plant using a current amine-based capture system. A series of parametric analyses also is undertaken to identify paths for enhancing the viability of membrane-based capture technology.
本研究调查了用于燃煤电厂燃烧后二氧化碳（CO₂）捕获的聚合物膜系统的可行性。使用新开发的性能和成本模型，我们的分析表明，采用多级或多步配置的膜系统能够满足 90%的 CO₂去除效率和 95%以上的产品纯度的捕获目标。使用压缩机和真空泵的组合驱动力设计对于降低避免的 CO₂的成本最为有效。通过采用两级、两步膜配置并结合空气吹扫来回收一部分 CO₂，以提高进料烟道气的 CO₂分压，可进一步降低整个系统的能量损失和成本。对于具有碳捕集和封存功能的典型工厂，与使用当前胺基捕集系统的工厂相比，每避免一吨 CO₂的成本降低了 15%。还进行了一系列参数分析，以确定增强基于膜的捕集技术可行性的途径。
