Cao Xinxin, Chen Shiyi, Xiang Wenguo
Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, 210096 Nanjing, China.
Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, 210096 Nanjing, China.
Sci Total Environ. 2024 Jun 1;927:172047. doi: 10.1016/j.scitotenv.2024.172047. Epub 2024 Apr 2.
In this paper, different emerging post-combustion technologies, i.e., monoethanolamine (MEA), aqueous ammonia, pressure swing adsorption (PSA), temperature swing adsorption (TSA), membrane and calcium looping, were applied to an ultra-supercritical coal-fired power plant for carbon capture. A 'cradle-to-grave' life cycle assessment (LCA) was conducted to evaluate the technical performance and environmental impacts of the power plant with six emerging carbon capture technologies. Carbon capture significantly influences the impact categories directly associated with flue gas emission. The application of carbon capture reduced the GWP in the range of 49-75 %. TAP also reduced in the range of 18-51 %. However, the human toxicity potential, eutrophication potential, ecotoxicity potential and particulate matter formation potential increased due to energy and resource consumption in the upstream and downstream processes. For the life cycle water consumption potential, it decreased by 8 % with calcium looping, whereas it increased in the range of 36-75 % with other post-combustion technologies. The highest reduction in GWP and the least reduction in power efficiency was observed in calcium looping because of the high-temperature heat recovery from flue gas and elimination of complex solvent manufacturing. The plant with aqueous ammonia and membrane separation had the second and third highest reductions in GWP. In addition, the lowest values for TAP, FEP, and MEP were obtained in the membrane system. With MEA for CO capture, the total GWP value of the plant is slightly higher than these three technologies mentioned above, and the highest HTPc, FETP, and METP can be observed in this case. TSA and PSA have the most significant environmental impacts in most categories due to higher energy requirements.
在本文中，不同的新兴燃烧后技术，即单乙醇胺（MEA）、氨水、变压吸附（PSA）、变温吸附（TSA）、膜分离和钙循环，被应用于一座超超临界燃煤电厂进行碳捕集。开展了一项“从摇篮到坟墓”的生命周期评估（LCA），以评估该电厂采用六种新兴碳捕集技术后的技术性能和环境影响。碳捕集对与烟气排放直接相关的影响类别有显著影响。碳捕集的应用使全球变暖潜能值（GWP）降低了49%至75%。总酸化潜势（TAP）也降低了18%至51%。然而，由于上下游过程中的能源和资源消耗，人体毒性潜势、富营养化潜势、生态毒性潜势和颗粒物形成潜势有所增加。对于生命周期水消耗潜势，采用钙循环时降低了8%，而采用其他燃烧后技术时则增加了36%至75%。由于从烟气中回收高温热量以及省去了复杂的溶剂制造过程，钙循环技术在降低GWP方面效果最为显著，而功率效率降低最少。采用氨水和膜分离的电厂在降低GWP方面分别位列第二和第三。此外，膜系统的总酸化潜势（TAP）、淡水生态毒性潜势（FEP）和海洋生态毒性潜势（MEP）值最低。采用MEA进行CO捕集时，电厂的总GWP值略高于上述三种技术，并且在这种情况下可观察到最高的人体毒性潜势（HTPc）、淡水生态毒性潜势（FETP）和海洋生态毒性潜势（METP）。由于能量需求较高，TSA和PSA在大多数类别中对环境的影响最为显著。
