热力发电2024，Vol.53Issue(11)：21-30,10.DOI:10.19666/j.rlfd.202403118
利用液化天然气冷能的冷热电联供系统热力分析与优化
Thermal analysis and optimization of combined cooling,heating and power system using LNG cold energy
摘要
Abstract
In order to solve the problems of waste heat utilization,carbon capture and liquid natural gas(LNG)cold energy utilization of solid oxide batteries fueled by methane,a new type of combined cooling,heating and power system was established.The system includes the improved recompression supercritical mixed working fluid Brayton cycle,the transcritical CO2 heat recovery Rankine cycle and the secondary mixed working fluid organic Rankine cycle.The thermodynamic analysis,equipment exergy analysis,economic cost analysis of the circulation system,and the multi-objective optimization of the system by using the genetic algorithm in MATLAB.The results show that,increasing P1,T16 and the mass fraction of R14 in the second-stage Rankine cycle can improve the network,thermal efficiency,and exergy efficiency of the system,and reduce the average unit cost.P1 is the pressure at inlet the expander in the compressed supercritical mixed working fluid Brayton cycle,T16 is the inlet temperature of the expander in the transcritical CO2 regenerative Rankine cycle.Under the optimal working conditions,the thermal efficiency,exergy efficiency and average unit cost of the system are 64.70%,47.85%and 24.20 dollars/GJ.关键词
液化天然气/冷热电联产/混合工质/多目标优化/经济分析Key words
liquefied natural gas/combined cooling heating and power supply/mixed working medium/multi-objective optimization/economic analysis引用本文复制引用
王长顺,宋昕洋,杨帆,乔焱,李洋,高月,李鹏飞..利用液化天然气冷能的冷热电联供系统热力分析与优化[J].热力发电,2024,53(11):21-30,10.基金项目
国家自然科学基金项目(52006094) （52006094）
辽宁省教育厅基本科研项目(LJKMZ20220725) National Natural Science Foundation of China(52006094) （LJKMZ20220725）
Liaoning Provincial Department of Education Fundamental Research Project(LJKMZ20220725) （LJKMZ20220725）
