集成LNG冷能空分的半闭式CO_(2)循环发电系统热力学分析与优化  

Thermodynamic Analysis and Optimization of Semi-closed CO_(2)Cycle Power Generation System Integrated with LNG Cold Energy for Air Separation Process

作　　者：许宏宇 李瑞凡 许诚[1] 郭豪 辛团团 杨勇平[1] XU Hongyu;LI Ruifan;XU Cheng;GUO Hao;XIN Tuantuan;YANG Yongping(Key Laboratory of Power Station Energy Transfer Conversion and System of Ministry of Education,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学电站能量传递转化与系统教育部重点实验室,北京102206

出　　处：《动力工程学报》2024年第8期1307-1316,共10页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(52176004);国家自然科学基金青年科学基金资助项目(52306008);中央高校科研基金资助项目(2023MS016)。

摘　　要：半闭式CO_(2)循环具有高效和零碳排放的特点,针对目前集成液化天然气(LNG)冷能的半闭式CO_(2)循环发电系统,提出了一种高效的LNG冷能的梯级利用方式。结果表明:基准案例中空分和压缩过程的能耗分别降低了70.4和75 MW,系统净效率为63.76%,相比于常规循环提升9.48个百分点;在此基础上,采取改进循环参数、匹配回热器热容等优化措施后,优化案例的净效率进一步提高至72.22%,系统的效率为51.27%。相比于仅在循环过程集成LNG冷能的参考系统Ⅱ,冷能利用的效率提高了28个百分点。Considering the characteristics of high efficiency and zero carbon emissions of the semi-closed CO_(2)cycle,and based on the semi-closed CO_(2)power generation system integrated with liquefied natural gas(LNG)cold energy at present,an efficient utilization way of LNG cold energy was proposed.Results show that,for the base case,the energy consumptions of the air separation and compression processes are reduced by 70.4 and 75 MW,respectively,and with a net system efficiency of 63.76%,which is 9.48 percentage points higher than the conventional cycle.Furthermore,with optimization measures such as improving the system parameters and matching the heat capacities of regenerators,the net efficiency of the optimized case is further increased to 72.22%,and the exergy efficiency is 51.27%.Compared with the reference systemⅡof only integrating LNG cold energy within the power cycle,the exergy efficiency of cold energy utilization is improved by 28 percentage points.

关 键 词：半闭式CO_(2)循环 LNG冷能 冷能空分 热力学分析 分析 

分 类 号：TK124[动力工程及工程热物理—工程热物理]