Life-Cycle Environmental and Economic Assessments of the Oxy- coal Combustion System Combined with a Pressurized Circulating Fluidized Bed and the Supercritical CO2 Brayton Cycle
Life-Cycle Environmental and Economic Assessments of the Oxy- coal Combustion System Combined with a Pressurized Circulating Fluidized Bed and the Supercritical CO2 Brayton Cycle
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结合加压循环流化床和超临界 CO2 布雷顿循环的富氧煤燃烧系统的生命周期环境和经济评估
DOI：
10.1021/acs.energyfuels.1c00067
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发表时间：
2021
期刊：
影响因子：
5.3
通讯作者：
Wenqi Zhong
中科院分区：
文献类型：
--
作者：
Yan Shi;Wenqi Zhong
循环流化床（OCFB）燃烧是一种很有前途的co2捕获和封存技术。然而，它的发展受到电力和二氧化碳捕获的高价格的严重阻碍。本文采用特定生命周期评价（LCA）方法，对增压燃烧室（POCFB）和超临界CO2Brayton循环的OCFB电厂进行了全生命周期环境经济评价。在这项工作中评估了四个过程，包括建筑材料生产、运输、原材料开采和发电厂运营。推导并比较了环境中点和终点影响。结果表明，与全氧燃煤电厂相比，采用加压燃烧室和S-CO2Brayton循环的系统对人体健康和环境的危害较小（6-12%）。同时，与OCFB电厂相比，POCFB电厂的发电成本、co2捕集成本和co2回避成本相对较低，分别为58.1美元/MWh、15.5美元/t和33.4美元/t。层次分析法-理想解相似性排序偏好法的结果表明，综合考虑经济、资源和环境因素，从居民和政府的角度来看，POCFB电厂是最优选择。本文还讨论了净电力效率、二氧化碳捕集率、锅炉投资、煤炭价格和二氧化碳税等参数对经济指标的影响。
Oxy-coal combustion with circulating fluidized bed (OCFB) is a promising technology for CO2capture and sequestration. However, its development is highly hindered by the high price of electricity and CO2capture. In this work, a comprehensive life-cycle environmental and economic assessment of OCFB power plants with a pressurized combustor (POCFB) and a supercritical CO2Brayton cycle is conducted using a specific life-cycle assessment (LCA) method. There are four processes evaluated in this work, including construction material production, transport, raw material mining, and power plant operation. Both environmental midpoint and endpoint impacts are derived and compared. The results show that compared to the oxy-coal combustion power plant, systems with a pressurized combustor and a S-CO2Brayton cycle have less damage (6–12%) to the human health and the environment. Meanwhile, compared to the OCFB power plant, POCFB has relatively lower costs of electricity, CO2capture, and CO2avoidance, which are 58.1 USD/MWh, 15.5 USD/t, and 33.4 USD/t, respectively. The results from the Analytic Hierarchy Process-Technique for Order Preference by Similarity to Ideal Solution methodology show that comprehensively considering the economy, resource, and environment, the POCFB power plant is the best option among the cases from the perspective of residents and the government. The influence of several parameters including net electricity efficiency, CO2capture rate, boiler investment, coal price, and CO2tax on the economic indicators is also discussed.