Zhang Tong, Zhang Xuelin, Xue Xiaodai, Wang Guohua, Mei Shengwei
State Key Laboratory of Control and Simulation of Power System and Generation Equipment, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China.
School of QiDi (TUS) Renewable Energy, Qinghai University, Xining 810016, China.
Entropy (Basel). 2019 Feb 26;21(3):220. doi: 10.3390/e21030220.
Liquid air energy storage (LAES) is a promising energy storage technology in consuming renewable energy and electricity grid management. In the baseline LAES (B-LAES), the compression heat is only utilized in heating the inlet air of turbines, and a large amount of compression heat is surplus, leading to a low round-trip efficiency (RTE). In this paper, an integrated energy system based on LAES and the Kalina cycle (KC), called KC-LAES, is proposed and analyzed. In the proposed system, the surplus compression heat is utilized to drive a KC system to generate additional electricity in the discharging process. An energetic model is developed to evaluate the performance of the KC and the KC-LAES. In the analysis of the KC subsystem, the calculation results show that the evaporating temperature has less influence on the performance of the KC-LAES system than the B-LAES system, and the optimal working fluid concentration and operating pressure are 85% and 12 MPa, respectively. For the KC-LAES, the calculation results indicate that the introduction of the KC notably improves the compression heat utilization ratio of the LAES, thereby improving the RTE. With a liquefaction pressure value of eight MPa and an expansion pressure value of four MPa, the RTE of the KC-LAES is 57.18%, while that of the B-LAES is 52.16%.
液态空气储能（LAES）在可再生能源消纳和电网管理方面是一项很有前景的储能技术。在基准液态空气储能系统（B-LAES）中，压缩热仅用于加热涡轮机的进气，大量压缩热过剩，导致往返效率（RTE）较低。本文提出并分析了一种基于液态空气储能和卡琳娜循环（KC）的集成能源系统，称为KC-LAES。在所提出的系统中，过剩的压缩热在放电过程中被用于驱动卡琳娜循环系统以产生额外的电力。建立了一个能量模型来评估卡琳娜循环和KC-LAES的性能。在卡琳娜循环子系统的分析中，计算结果表明，与B-LAES系统相比，蒸发温度对KC-LAES系统性能的影响较小，最佳工质浓度和运行压力分别为85%和12兆帕。对于KC-LAES，计算结果表明，卡琳娜循环的引入显著提高了液态空气储能的压缩热利用率，从而提高了往返效率。在液化压力值为8兆帕和膨胀压力值为4兆帕的情况下，KC-LAES的往返效率为57.18%，而B-LAES的往返效率为52.16%。
