技术中心

摘 要： 以LNG冷能和废热源驱动的有机朗肯循环可以提高系统的能源利用率。通过流程模拟软件HYSYS对使用不同工质的朗肯循环系统进行了模拟分析，结果表明，丙烷是用于低温朗肯循环最合适的工质。循环工质的蒸发温度高低对系统的净输出功及□效率影响较为明显，废热烟气的流量或温度的提升有助于改善系统的性能。选定一个合适的冷凝温度，既能保证系统单位质量LNG所能输出的净功在一个合理的范围内，又可以改善系统□效率。 关键词 ：LNG冷能 有机朗肯循环 工质 变工况性能 效率 Analysis Of Working Fluid And Variable Working Conditions Of Organic Rankine Cycle Utilizing Lng Cold Energy Wang Tao Lin Wensheng Gu Anzhong （Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China） Abstract: An organic Rankine cycle driven by the cold energy of liquefied natural gas(LNG) and waste heat in exhaust gas was established to improve energy efficiency. Several organic Rankine cycle using different working fluids were simulated with the process simulator HYSYS. Results show that propane is the most suitable working fluid. The evaporation temperature of working fluid has a significant effect on net power output per unit mass of LNG and exergy efficiency. More exhaust gas flow rate and higher exhaust temperature can contribute to improve system performance. A suitable condensation temperature is necessary to ensure the net power output per unit mass of LNG in a reasonable range, and also can improve system exergy efficiency. Keywords: LNG cold energy; organic Rankine cycle; working fluid; variable working conditions; system efficiency 参考文献 [1] 顾安忠，鲁雪生，汪荣顺，et al. 液化天然气技术[M]. 北京:机械工业出版社, 2004. [2] 贺红明，林文胜. 基于LNG冷能的发电技术[J]. 低温与超导,2006, 6: 432-436. [3] 贺红明，林文胜. 利用LNG物理□的朗肯循环研究[硕士学位论文].上海:上海交通大学, 2007. [4] Zhang Na, Lior N. A novel near-zero CO2 emission thermal cycle with LNG cryogenic exergy utilization[J]. Energy, 2006,31:16661679. [5] Lin Wensheng, Huang Meibin, He Hongming, et al. A transcritical CO2 Rankine Cycle with LNG cold energy utilization and liquefaction of CO2 in gas turbine exhaust. Journal of Energy Resources Technology-Transactions of the ASME, 2009,131(4):042201-1-042201-5 [6] 郑浩，汤珂，金滔，et al. 有机朗肯循环工质研究进展[J]. 能源工程,2008,8:5-11. [7] 童钧耕, 吴孟余. 高等工程热力学[M]. 北京:科学出版社, 2006. [8] 杨世铭, 陶文铨. 传热学[M]. 北京:高等教育出版社,1998 [9] Wang Qiang, Li Yanzhong, Wang Jiang. Analysis of power cycle based on cold energy of liquefied natural gas and low-grade heat source. Applied Thermal Engineering[J], 2004, 24: 539-548. [10] 王强，厉严忠，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. [11] 魏东红，陆震，鲁雪生，et al. 废热源驱动的有机朗肯循环系统变工况性能分析[J]. 上海交通大学学报, 2006, 40(8): 1398-1402.