摘要
为研究超临界二氧化碳(SCO_(2))燃煤热电联产系统的性能特点,并指出系统性能提升的方向,通过Ebsilon软件建立SCO_(2)燃煤热电联产系统的仿真模型,对系统的热力性能及灵活性进行分析,并研究设计条件变化对系统性能的影响。结果表明:设计工况下,该系统的能量效率和[火用]效率分别为89.74%和44.03%;该系统的运行域面积为11.40 m^(2),相比于传统系统提高了93.55%;当压缩机入口压力选为7.6 MPa时,系统具有较高的[火用]效率和较好的灵活性,当压缩机入口压力选为11.2 MPa时,系统具有较高的能量效率和较好的灵活性;在供热分流系数小于1的非设计工况下,降低预冷器出口温度可提高系统的热力性能;在系统灵活性提升方面,优先选择提高系统允许的最大流量。
To study the performance characteristic of a supercritical carbon dioxide(SCO_(2)) coal-fired cogeneration system and point out the direction of system performance improvement,the simulated model of the SCO_(2)coal-fired cogeneration system was established by Ebsilon software.The thermal performance and flexibility of the system were analyzed,and the effects of design conditions on system performance were studied.Results show that under the design condition,the energy efficiency and exergy efficiency of the system are 89.74% and 44.03%,respectively.The operating domain area of the system is 11.40 m~2,which is 93.55% higher than that of the traditional system.When the compressor inlet pressure is selected at 7.6 MPa,the system has higher exergy efficiency and better flexibility.When the compressor inlet pressure is selected at 11.2 MPa,the system has higher energy efficiency and better flexibility.Under the off-design condition that the heat supply split coefficient is less than 1,the thermal performance of the system could be improved by decreasing the precooler outlet temperature.To improve the system flexibility,the scheme to increase the maximum permissible flow rate of the system is preferred.
作者
陈东旭
韩中合
郭董阳
白亚平
李鹏
CHEN Dongxu;HAN Zhonghe;GUO Dongyang;BAI Yaping;LI Peng(Hebei Key Laboratory of Low Carbon and High Efficiency Power Generation Technology,North China Electric Power University,Baoding 071003,Hebei Province,China;Department of Power Engineering,North China Electric Power University,Baoding 071003,Hebei Province,China)
出处
《动力工程学报》
CAS
CSCD
北大核心
2023年第2期214-221,236,共9页
Journal of Chinese Society of Power Engineering
基金
河北省在读研究生创新能力培养资助项目(CXZZBS2022149)。
关键词
超临界二氧化碳
燃煤
热电联产
能量效率
[火用]效率
运行域
supercritical carbon dioxide
coal-fired
heat and power cogeneration
energy efficiency
exergy efficiency
operating domain
作者简介
陈东旭(1996-),男,辽宁鞍山人,博士研究生,研究方向为以超临界二氧化碳为工质的燃煤发电技术;通信作者:韩中合,男,教授,博士,电话(Tel.):13731692981,E-mail:hanzhonghe@ncepu.edu.cn。
