超临界二氧化碳布雷顿循环热力学优化研究

Investigations on Thermodynamic Optimization of Supercritical CO₂ Brayton Cycle

摘要: 超临界二氧化碳布雷顿循环是核能技术创新的重要选择。基于热力学第一定律，开展了超临界二氧化碳布雷顿循环热力学分析与优化研究。为进一步提高转换效率，提出了双级分流压缩循环方案，开展了热力学特性分析和评价，获得了间冷、再热对系统效率的影响规律，并与传统再压缩循环进行了定量比较。研究表明：本文提出的双级分流压缩循环比传统再压缩循环的热效率可提高1~2个百分点，带间冷和再热时热效率可提高近3个百分点。

Abstract: Supercritical carbon dioxide Brayton cycle is an important candidate in nuclear energy innovation. In this paper, an investigation on thermodynamic analysis and optimization was carried out for supercritical carbon dioxide Brayton cycles on the basis of the first law of thermodynamics. A new cycle, called double flow split compression cycle, was proposed to further increase system efficiency. Thermodynamic analysis and evaluation have been conducted. The effect of inter-cooling and re-heating on cycle efficiency has been obtained. A comparison of cycle efficiency has been made between the newly proposed double flow split compression cycle and traditional recompression cycle. The results show that cycle efficiency of double flow split compression cycle is 1-2 percent higher than that of recompression cycle. The efficiency improvement can exceed 3 percent while inter-cooling and re-heating were adopted in system.