基于LNG冷能的冷电联产CO_(2)捕集系统热力学  

Thermodynamics of cogeneration CO_(2) capture system based on LNG cold energy

作　　者：李鹏飞 杨帆[1] 田大微 李洋 海笑 高月 陈旭阳 LI Pengfei;YANG Fan;TIAN Dawei;LI Yang;HAI Xiao;GAO Yue;CHEN Xuyang(College of Petroleum Engineering,Liaoning Petrochemical University,Fushun 113001,Liaoning Province,China;Dalian Shipbuilding Industry Equipment Manufacturing Co.,Ltd.,Dalian 116000,Liaoning Province,China;College of Mechanical Engineering,Liaoning Petrochemical University,Fushun 113001,Liaoning Province,China)

机构地区：[1]辽宁石油化工大学石油天然气工程学院,辽宁抚顺113001 [2]大连船舶重工集团装备制造有限公司,辽宁大连116000 [3]辽宁石油化工大学机械工程学院,辽宁抚顺113001

出　　处：《化学工程》2025年第3期83-88,共6页Chemical Engineering(China)

基　　金：国家自然科学基金资助项目(52006094);辽宁省教育厅基本科研项目(LJKMZ20220725)。

摘　　要：为了实现“碳中和”,将工业废气进行余热回收以及CO_(2)捕集,进而提出一种基于LNG冷能利用的多联产系统。采用仿真软件对系统流程进行模拟,分析超临界CO_(2)循环蒸发温度和汽轮机入口压力、CO_(2)回热朗肯循环泵出口压力、LNG入口流量对热力学性能的影响。结果表明:当布雷顿循环和CO_(2)回热循环中的CO_(2)质量流量、LNG质量流量分别为2.5、3.2、5.5 kg/s,汽轮机的等熵效率为80%,超临界CO_(2)布雷顿循环汽轮机的入口压力和温度、CO_(2)回热朗肯循环的泵出口压力分别为25 MPa、780℃、16 MPa时,系统的净输出功为3016.73 kW,热效率为62.36%,[火用]效率为48.36%,年度净资产为3746004.15美元,充分地利用了烟气余热和LNG冷能,兼顾CO_(2)捕集,以实现“碳中和”目标。In order to achieve“carbon neutrality”,industrial waste gas waste heat recovery and CO_(2) capture,and then a multi-generation system was proposed based on LNG cold energy utilization.Simulation software was used to simulate the system flow,and the influences of supercritical CO_(2) cycling evaporation temperature,turbine inlet pressure,CO_(2) reheating Rankine circulation pump outlet pressure and LNG inlet flow on thermodynamic performance were analyzed.The results show that when the mass flow of CO_(2) in the Brayton cycle and CO_(2) regenerative cycle and LNG are 2.5,3.2 and 5.5 kg/s,respectively,the isentropic efficiency of the turbine is 80%.When the inlet pressure and temperature of the supercritical CO_(2) Brayton cycle gas turbine and the outlet pressure of the CO_(2) regenerative Rankine cycle pump are 25 MPa,780℃ and 16 MPa,the net output work of the system is 3016.73 kW,the thermal efficiency is 62.36%,the exergy efficiency is 48.36%,and the annual net asset value is 3746004.15 dollars.The waste heat of flue gas and cold energy of LNG are fully utilized,and CO_(2) capture is taken into account to achieve the goal of“carbon neutrality”.

关 键 词：布雷顿循环 回热朗肯循环 LNG冷能利用 CO_(2)捕集 碳中和 

分 类 号：TK124[动力工程及工程热物理—工程热物理]