集成有机朗肯循环的Allam-LNG冷电联产系统的热力学分析  

Thermodynamic Analysis for the Combined Cooling and Power System of the Allam-LNG Cycle Integrated With Organic Rankine Cycle

作　　者：产文 李会雄[1] 李熙 CHAN Wen;LI Huixiong;LI Xi(State Key Laboratory of Multiphase Flow in Power Engineering(Xi’an Jiaotong University),Xi’an 710049,Shaanxi Province,China)

机构地区：[1]动力工程多相流国家重点实验室(西安交通大学),陕西省西安市710049

出　　处：《中国电机工程学报》2023年第17期6688-6697,共10页Proceedings of the CSEE

摘　　要：为实现我国“碳达峰和碳中和”的目标,化石燃料的低碳发电甚至零碳发电是未来发电技术的重要发展方向。该文提出一种包含Allam循环和有机朗肯循环(organicRankine cycle,ORC)的冷电联产系统,并利用液化天然气(liquefied natural gas,LNG)的冷能使Allam循环透平排气液化。对系统中的设备进行建模,并比较分析4种有机工质,同时进行详细的参数敏感性分析。结果表明,相比于不包括ORC作为底循环的Allam-LNG系统,该系统具有更好的热力学性能。采用R170作为有机工质的联合循环能够获得最高的发电效率和㶲效率,分别为64.90%和45.29%。参数分析结果表明,ORC底循环参数的变化不会影响顶循环的热力学性能,并且增加ORC最大压力和有机工质流量,均能提高联合循环的㶲效率和比功。提出的冷电联产系统有效利用了LNG再气化过程中释放的冷能,提升了Allam循环的发电效率。Power generation with low or even zero carbon emissions will be an important development direction in energy industry to achieve the goal of carbon peak and carbon neutrality in China.A combined cooling and power generation system composed of the Allam cycle and organic Rankin cycle(ORC)is proposed,which uses the cold energy of liquefied natural gas(LNG)to condense the turbine exhaust in the Allam cycle.The components in the system are modeled in detail and then four organic working fluids for the ORC bottom cycle are compared.Finally,a detailed parameter sensitivity analysis is conducted.The results show that the proposed system has better thermodynamic performance than the standalone Allam-LNG system,which does not include an ORC as bottom cycle.The proposed combined cycle using R170 as the organic working fluid has the highest electrical efficiency of 64.90%and exergetic efficiency of 45.29%.The results of parameter analysis show that the variation of the parameters in ORC does not affect the thermodynamic performance of the top cycle,and the exergetic efficiency and specific work of the combined cycle are increased with the increase in the ORC maximum pressure and the mass flow rate of the organic working fluid.The proposed combined cooling and power system in this paper effectively utilizes the cold energy released in the regasification process of LNG and increases the electrical efficiency of the Allam cycle.

关 键 词：Allam循环 有机朗肯循环 冷电联产 㶲分析 碳中和 

分 类 号：TK11[动力工程及工程热物理—热能工程]