碳捕集电厂的运行机制研究与调峰效益分析

Operation Mechanism and Peak-load Shaving Effects of Carbon-capture Power Plant

二氧化碳捕集和封存(carbon capture and storage,CCS)是实现电力低碳化发展的关键技术,具有光明的发展前景。作为未来重要的电源选择,碳捕集电厂的运行性能与调整能力将对电网运行的安全性与高效性产生重大影响。结合碳捕集技术的基本原理,深入研究了碳捕集电厂内部的能量流,量化分析了碳捕集电厂的运行区间,并揭示了碳捕集电厂的调峰性能。在此基础上,提出基于"电力系统调峰成本曲线"的分析方法,以直观、简明的方式实现了电力系统的调峰优化决策;并以具有复杂电源结构的电力系统为例进行调峰效果分析,特别测算了碳捕集电厂对电力系统容纳大规模风电接入的贡献率,评估了碳捕集电厂在提高电网运行安全裕度与降低系统调峰成本上的显著效益。

Carbon capture and storage （CCS） technology is a critical option for delivering low carbon power. Carbon capture power plant would present special characteristics, imposing significant impacts on the security and efficiency of power system operation. In this paper, considering the fundamental principle of CCS technology, inner energy flow of carbon-capture power plant was examined, generation output limits were quantified, and performances of carbon-capture plant in power peak-load shaving scheme were revealed. Then, a novel method based on ＂cost curve of power peak load shaving＂ was proposed and a numerical case integrating complex power mix was introduced, for the purpose of analyzing the saved costs in peak shaving, the improved operation margin in system operation and the enhanced penetrations for large-scale renewables, especially wind power, that incurred by connecting carbon-capture plant to power grid at large-scale.