液化天然气冷能利用的联合动力循环  

Combined power cycle for cold energy utilization of liquefied natural gas

作　　者：潘本艺 杨帆[1] 周莉[2] 商丽艳[3] 李萍[3] PAN Ben-yi;YANG Fan;ZHOU Li;SHANG Li-yan;LI Ping(College of Petroleum Engineering,Liaoning Petrochemical University,Fushun 113001,China;College of Petrochemical Engineering,Liaoning Petrochemical University,Fushun 113001,China;College of Chemical Engineering and Environmental Engineering,Liaoning Petrochemical University,Fushun 113001,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]辽宁石油化工大学石油化工学院,辽宁抚顺113001 [3]辽宁石油化工大学环境与安全工程学院,辽宁抚顺113001

出　　处：《高校化学工程学报》2021年第4期702-710,共9页Journal of Chemical Engineering of Chinese Universities

基　　金：辽宁省博士科研启动基金计划(2019-BS-159);辽宁省教育厅科学研究经费项目(L2019024);辽宁省教育厅重点科研项目(L2020002)。

摘　　要：针对梯级利用液化天然气(LNG)在气化过程中释放冷能的同时回收烟气中的二氧化碳(CO2)问题,提出一套氮气回热布雷顿(Brayton)循环与乙烯-丙烷二级有机朗肯循环(ORC)联合的冷热电三联供系统。采用数值模拟软件对系统进行模拟计算。分析蒸发压力、蒸发温度、氮气质量流量对系统性能的影响。模拟结果表明,在氮气质量流量为45000 kg×h^(-1)时,系统的净输出功可达到2834.1 kW,热效率为42.7%,㶲效率为35.1%。经济分析结果表明,系统的年度净资产(NE)为4209633.277$,折旧回收期(DPP)为4.23 a。研究成果对环境保护具有重要意义。A combined cooling,heating and power supply system with a nitrogen regenerative Brayton cycle and an ethylene-propane secondary organic Rankine cycle(ORC)was proposed for cascade utilization of cold energy released by liquefied natural gas(LNG)during gasification while recovering carbon dioxide(CO2)from flue gas.The system was simulated and calculated by numerical simulation software.Effects of evaporation pressure,evaporation temperature and nitrogen mass flow rate on system performance were analyzed.The simulation results show that when nitrogen mass flow is 45000 kg×h^(-1),the net output of the system can reach 2834.1 kW with thermal efficiency of 42.7%and exergy efficiency of 35.1%.The results obtained through economic analysis show that the system annual net assets(NE)is 4209633.277$,and the depreciation payback period(DPP)is 4.23 a.These results are useful for environmental protection.

关 键 词：液化天然气 热力学分析 经济分析 冷热电三联供 

分 类 号：TH09[机械工程]