摘要
超临界二氧化碳(SCO_(2))布雷顿循环的循环效率与循环系统中部件的参数有密切的联系。本文基于MATLAB/Simulink平台建立了关于SCO_(2)布雷顿循环的模块化计算程序,采用分流再压缩及二次再热方案对大容量燃煤发电系统进行了设计和分析,重点考察了透平,压缩机、烟气冷却器的关键参数的影响。研究表明:再压缩机最佳的分流比随着透平入口压力的提高而降低;烟气冷却器的分流比会显著影响锅炉换热器的功率分布;随着压缩机的入口温度和入口压力的提高,循环效率均逐渐下降;35 MPa,600℃等级系统的最高循环效率可达到53.34%,此时,再热压力为25 MPa/16 MPa,再压缩机和烟气冷却器的分流比分别为0.3和0.05。本文的研究结果对大型燃煤SCO_(2)发电系统的建立和优化具有重要的参考价值。
The efficiency of the supercritical carbon dioxide(SCO_(2))Brayton cycle is closely related to the parameters of the components in the cycle system.Based on the MATLAB/Simulink platform,a modularized calculation procedure for the SCO_(2) Brayton cycle was established.The design and analysis of a large capacity coal-fired power generation system were carried out using split fow recompression and secondary reheating schemes,and the influence of relevant parameters of components was investigated,such as turbines,compressors,and fue gas coolers.The results showed that the optimal split ratio of the recompressor decreased with the increase of turbine inlet pressure;The power distributions of the heater exchangers in boiler were significantly affected by the split ratio of the fue gas cooler;The circulation efficiency of the system reached its highest level at 35 MPa and 600℃,when the primary reheat pressure and secondary reheat pressure were 25 MPa and 16 MPa,respectively,and the split ratio of the recompressor and the fue gas cooler is 0.3 and 0.05,respectively;As the inlet temperature and pressure of the compressor increased,the circulation efficiency gradually decreased.The research results of this article have important reference value for the establishment and optimization of the large-scale coal-fired SCO_(2) power generation systems.
作者
郑志敏
沈浩齐
冯帅帅
卢乐昊
吴海波
ZHENG Zhimin;SHEN Haoqi;FENG Shuaishuai;LU Lehao;WU Haibo(School of Energy and Environment,Anhui University of Technology,Ma'anshan 243002,China;Tianjin Guoneng Panshan Power Generation Company Limited,Tianjin 301907,China)
出处
《工程热物理学报》
北大核心
2025年第6期1747-1759,共13页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.52176148)
安徽工业大学省级大学生创新创业训练计划项目资助(No.S202210360406)。
关键词
超临界二氧化碳
二次再热
分流再压缩
燃煤锅炉
supercritical carbon dioxide
secondary reheating
diversion and recompression
coalfired boiler
