摘要
预热型超临界二氧化碳(Supercritical CO_(2),简称S-CO_(2))布雷顿循环可进一步利用高温热源余热,在燃气轮机余热回收应用领域中具有较高的发展潜力。本文以存在有限温差传热、不可逆压缩、不可逆膨胀等不可逆因素的预热型S-CO_(2)布雷顿循环为研究对象,考虑生态学函数为目标,首先分析了工质质量流率、压比、透平效率和压缩机效率的影响,然后在总热导率一定的条件下,以生态学函数最大目标分别对压比、质量流率、预热器、加热器、冷却器和回热器热导率分配比进行优化。结果表明:在质量流率较小时,可通过增大压比、分流系数、加热器热导率分配比的方式来提高生态学函数;在质量流率较大时,则需要适当减小压比、分流系数,增大预热器热导率分配比来提高生态学函数;经优化,循环生态学函数最大可提高150.98%。
The preheated S-CO_(2) Brayton cycle can further utilize the waste heat of high temperature heat sources,and has a high development potential in the application of waste heat recovery of gas turbines.In this paper,a preheated S-CO_(2) Brayton cycle with finite temperature difference heat transfer,irreversible compression,irreversible expansion and other irreversible factors is studied.Firstly,the ecological function is chosen to be objective,and the influences of working fluid mass flow rate,pressure ratio,turbine efficiency and compressor efficiency are analyzed.Then,the pressure ratio,mass flow rate,the heat conductance distribution ratio of preheater,heater,cooler and regenerator are optimized with the maximum ecological function under the condition of constant total heat exchanger inventory.The results show that when the mass flow rate is small,the ecological function can be improved by increasing the pressure ratio,the split coefficient,and the heat conductance distribution ratio of heater.When the mass flow rate is large,it is necessary to appropriately reduce the pressure ratio,the split coefficient,and increase the heat conductance distribution ratio of preheater to improve the ecological function.After optimization,the cycle ecological function can be improved by 150.98%at the maximum.
作者
金晴龙
夏少军
陈林根
黄佳洛
谢志辉
JIN Qinglong;XIA Shaojun;CHEN Lingen;HUANG Jialuo;XIE Zhihui(College of Power Engineering,Naval University of Engineering,Wuhan 430033,China;Institute of Thermal Science and Power Engineering,Wuhan Institute of Technology,Wuhan 430205,China;Hubei Provincial Engineering Technology Research Center of Green Chemical Equipment,Wuhan 430205,China;School of Mechanical&Electrical Engineering,Wuhan Institute of Technology,Wuhan 430205,China)
出处
《工程热物理学报》
EI
CSCD
北大核心
2023年第11期2956-2966,共11页
Journal of Engineering Thermophysics
基金
国家自然科学基金项目(No.51976235,No.51606218,No.51576207)
湖北省自然科学基金项目(No.2018CFB708)。
关键词
预热型超临界二氧化碳布雷顿循环
有限时间热力学
生态学函数
性能优化
preheated supercritical carbon dioxide brayton cycle
finite-time thermodynamics
ecological function
performance optimization
