结合燃气–蒸汽联合循环的液化天然气冷能发电利用
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摘要
提出了结合燃气–蒸汽联合循环的利用液化天然气(liquefied natural gas,LNG)冷能的朗肯循环发电系统,实现LNG冷能梯级利用。朗肯循环蒸发器和燃气–蒸汽联合循环凝汽器换热量匹配一致,循环水系统实现闭式且不受环境温度影响。对系统进行模拟并分析了影响系统的主要参数,结果显示:随着朗肯循环冷凝温度的降低,朗肯循环净输出功率和净效率均有提升;随着循环水温度的提高,朗肯循环的净输出功率和净效率都将提高,而蒸汽轮机输出功率减少,但二者总的输出功率降低幅度不大。
This paper presents a power generation system using liquefied natural gas(LNG) cold energy to implement gradient utilization, which is a Rankine's cycle integrated with gas turbine combined cycle. In this system, the heat transfer of evaporator in Rankine's cycle is equal with that of condenser in gas turbine combined cycle. Circulating water system is in closed type and would not be affected by environmental temperature. The system was simulated, and main influence parameters of the system were analyzed. The results show that: the net output power and efficiency of Rankine's cycle are elevated with the decrease of the condensation temperature in Rankine's cycle; with the rise of circulating water temperature, the net output power and efficiency of Rankine's cycle are elevated while the output power of steam turbine decreases, but the both total power output reduces slightly.
This paper presents a power generation system using liquefied natural gas(LNG) cold energy to implement gradient utilization, which is a Rankine's cycle integrated with gas turbine combined cycle. In this system, the heat transfer of evaporator in Rankine's cycle is equal with that of condenser in gas turbine combined cycle. Circulating water system is in closed type and would not be affected by environmental temperature. The system was simulated, and main influence parameters of the system were analyzed. The results show that: the net output power and efficiency of Rankine's cycle are elevated with the decrease of the condensation temperature in Rankine's cycle; with the rise of circulating water temperature, the net output power and efficiency of Rankine's cycle are elevated while the output power of steam turbine decreases, but the both total power output reduces slightly.
引文
[1]曹靖.分布式能源系统在液化天然气接收站的应用[J].发电与空调,2012,33(4):9-12.
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[15]张超,金海刚,邵国芬,等.LNG冷能发电工质选择与参数优化[J].石油与天然气化工,2015,44(4):54-58.
[16]王弢,林文胜,顾安忠.利用LNG冷能的有机朗肯循环系统的工质研究和变工况性能分析[J].化工学报,2010,61(S2):107-111.
[17]鹿院卫,杨红昌,吕鹏飞,等.液化天然气冷能发电系统参数分析与工质选择[J].北京工业大学学报,2011,37(12):1874-1879.
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[19]严艺敏.因地制宜积极探索LNG冷能利用合理途——上海LNG接收站冷能利用方案研究[J].上海煤气,2014(2):2-7.
[20]孙文.分布式能源系统建模仿真及特性研究[D].南京:东南大学,2016.
[2]余黎明.高效利用LNG冷能的途径探析[J].化学工业,2014,32(5):1-12.
[3]王坤,鲁雪生,顾安忠.液化天然气冷能利用发电技术浅析[J].低温工程,2005(1):53-58.
[4]王强,厉彦忠,陈曦.一种基于低品位热源的LNG冷能回收低温动力系统[J].热能动力工程,2003,18(3):245-247.
[5]张墨耕,赵良举,刘朝,等.利用LNG冷能与工业余热的有机朗肯循环复合系统优化分析[J].化工学报,2014,65(8):3144-3151.
[6]饶文姬,赵良举,张墨耕,等.利用LNG冷能与低温太阳能的新型联合动力循环系统优化研究[J].动力工程学报,2014,34(12):990-996.
[7]杨永军,黄峰.大型燃气轮机电站对LNG接收站冷能的利用[J].中国电力,2001,34(7):5-8.
[8]张海成.回收LNG冷能用于发电燃气轮机进气冷却的可行性[J].中国电力,2002,35(3):24-26.
[9]李波,马强.燃气蒸汽联合循环机组中LNG冷能利用方案研究[J].山东电力技术,2017(44):47-51.
[10]赖志颖,邵林广.沿海电厂循环冷却水利用液化天然气接收站冷排水降温技术[J].给水排水,2010,36(8):62-64.
[11]李辉,付林,朱颖心.燃气轮机入口空气冷却系统的技术经济性能[J].热能动力工程,2006,21(3):231-234.
[12]郑李坤,顾昌,闫桂焕.运行参数变化对凝汽器真空影响的探讨[J].汽轮机技术,2002,44(6):363-364.
[13]孙军.日本电力产业LNG供需状况浅析[J].发电与空调,2014,35(5):45-49.
[14]李玲.LNG接收站冷能发电方式初探[J].石油化工设计,2014,31(2):26-29.
[15]张超,金海刚,邵国芬,等.LNG冷能发电工质选择与参数优化[J].石油与天然气化工,2015,44(4):54-58.
[16]王弢,林文胜,顾安忠.利用LNG冷能的有机朗肯循环系统的工质研究和变工况性能分析[J].化工学报,2010,61(S2):107-111.
[17]鹿院卫,杨红昌,吕鹏飞,等.液化天然气冷能发电系统参数分析与工质选择[J].北京工业大学学报,2011,37(12):1874-1879.
[18]张磊,高为,余黎明,等.LNG冷能发电朗肯循环工质研究[J].低温技术,2015,43(2):51-54.
[19]严艺敏.因地制宜积极探索LNG冷能利用合理途——上海LNG接收站冷能利用方案研究[J].上海煤气,2014(2):2-7.
[20]孙文.分布式能源系统建模仿真及特性研究[D].南京:东南大学,2016.