Identification of the cost-optimal degree of CO2 capture: An optimisation study using dynamic process models
Identification of the cost-optimal degree of CO2 capture: An optimisation study using dynamic process models
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DOI：
10.1016/j.ijggc.2012.11.029
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发表时间：
2013-03
影响因子：
3.9
通讯作者：
N. M. Dowell;N. Shah
中科院分区：
文献类型：
--
作者：
N. M. Dowell;N. Shah
通过使用胺溶剂的CO2捕集来捕集来自化石燃料燃烧的发电厂的CO2排放被认为是一种有吸引力的方法，其减少人为CO2排放，同时确保能源供应的可用性。然而，这些过程是资本密集型的，并且对与它们集成的发电厂施加很大的效率惩罚。因此，重要的是以寿命成本最优的方式设计和操作这些系统。在这项工作中，我们提出了一个优化研究的结果，旨在确定成本最优程度的CO2捕获使用后燃烧胺洗涤集成与660兆瓦的亚临界燃煤发电站。为了解决这个问题，我们进行了优化研究，使用动态的，非平衡模型的吸收过程中，明确考虑权衡与CO2排放到大气中的成本对机会成本与减少发电厂的电力输出。我们发现，95%的二氧化碳捕获率似乎是最佳的。富CO2溶剂的显着加热被认为是一个非常重要的贡献，与溶剂再生相关的能源惩罚，突出需要有效的热集成和废热利用。捕获-绕过备选办法似乎很有希望作为一种手段，以减少在早期阶段部署CO2捕获基础设施的背景下的先发抑制因素。最后，进入电力市场的脱碳电力，即，在相对较高的能力系数下运行似乎对证明对CO2捕集厂的投资是重要的。
The capture of CO2emissions from fossil-fuel fired power plants by CO2capture using amine solvents is considered an attractive method with which to mitigate anthropogenic CO2emissions whilst simultaneously ensuring availability of energy supply. However, these processes are capital intensive and impose large efficiency penalties on the power plants with which they are integrated. It is thus important to design and operate these systems in a life-time cost optimal fashion. In this work, we present the results of an optimisation study aimed at identifying the cost-optimal degree of CO2capture using post-combustion amine-scrubbing integrated with a 660MWe sub-critical coal fired power station. To address this question, we carry out an optimisation study using a dynamic, non-equilibrium model of an absorption process, explicitly considering the trade-off associated with the cost of emission of CO2to atmosphere against the opportunity cost associated with reducing the electricity output of the power plant. We find that a 95% rate of CO2capture appears to be optimal. Sensible heating of CO2rich solvent was found to be a very important contribution to energy penalty associated with solvent regeneration, highlighting the need for efficient heat integration and waste heat utilisation. Capture-bypass options appear promising as a means to reduce first-mover disincentive in the context of the early stage deployment of CO2capture infrastructure. Finally, access to electricity markets for decarbonised electricity, i.e., operation at relatively high capacity factors would appear to be important to justify investment in CO2capture plant.