第 40 卷 增刊 中 国 电 机 工 程 学 报 Vol.40 Supplement Aug.31, 2020 2020 年 8 月 Proceedings of the CSEE ©2020 Chin.Soc.for Elec.Eng. 211 DOI：10.13334/j.0258-8013.pcsee.200755 文章编号：0258-8013 (2020) S-0211-11 中图分类号： TK 123 多级回热压缩超临界二氧化碳循环的构建及分析 李航宁，孙恩慧*，徐进良 (低品位能源多相流与传热北京市重点实验室(华北电力大学)，北京市 昌平区 102206) Construction and Analysis of Supercritical Carbon Dioxide Cycle With Multi-stage Regenerative-compression LI Hangning, SUN Enhui*, XU Jinliang (The Beijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy Utilization (North China Electric Power University), Changping District, Beijing 102206, China) ABSTRACT: Supercritical carbon dioxide (S-CO2) cycle has various structures. This paper discussed in detail the influence of the regenerative-compression process on thermal efficiency. Through the first law of thermodynamics, it is found that the thermal efficiency of the re-compression cycle (RC) can be expressed in two parts. The efficiency of one part is the same as that of single cycle Brayton cycle, and the other part is 100%. The share of the two parts is the same as that of the flow rate in the main and auxiliary compressors. According to this finding, it can be seen that a cycle with 100% efficiency is added to the SC to form the RC with higher efficiency. According to this idea, on the basis of the RC, a cycle with an efficiency of 100% can be added to build a three-stage regenerative-compression cycle (TC), which has higher thermal efficiency. However, there are two construction conditions to be satisfied: the terminal temperature difference condition and the work output condition. As long as these two conditions...
