压缩空气储能地下储气库热力学改进模型研究  

Study on improved model for the thermodynamics of compressed air energy storage underground cavern

作　　者：蒋中明[1,2] 廖峻慧 肖喆臻 杨江寅 黄湘宜 JIANG Zhongming;LIAO Junhui;XIAO Zhezhen;YANG Jiangyin;HUANG Xiangyi(School of Hydraulic and Environmental Engineering,Changsha University of Science&Technology,Changsha 410114,China;Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province,Changsha 410114,China)

机构地区：[1]长沙理工大学水利与环境工程学院,湖南长沙410114 [2]水沙科学与水灾害防治湖南省重点实验室,湖南长沙410114

出　　处：《长沙理工大学学报（自然科学版）》2024年第2期32-41,共10页Journal of Changsha University of Science and Technology:Natural Science

基　　金：国家自然科学基金项目(52178381)。

摘　　要：【目的】明晰地下储气库的热力学过程是压缩空气储能(compressed air energy storage,CAES)电站安全设计与运行调度的重要基础。【方法】现有地下储气库热力学模型在计算热量交换时,存在高压储气阶段热损失偏大和低压储气库阶段补热过多的不足。本文在全面分析地下储气库热力学模型理论基础合理性的前提下,先分析储气库热量计算偏差的形成根源;再提出改进模型。【结果】研究结果表明:现有的热力学计算解析模型忽略了CAES地下储气库在运行过程中温度分布的不均匀性,这种温度分布的不均匀导致储气室洞壁与压缩空气之间的对流换热模型失真,导致温度计算结果偏差大。考虑混合对流换热的改进模型二可以较好地解决储气阶段温度计算结果与真实结果之间偏差过大的问题。算例分析证明了改进模型二的合理性。【结论】本文的改进模型二可为CAES地下储气库容积优化设计与效率分析提供计算依据。[Purposes]The clarity of the thermodynamic process of underground cavern is an important basis for the safety design and operation scheduling of compressed air energy storage(CAES)plants.[Methods]In view of the existing thermodynamic model of underground cavern has the shortcomings in calculating heat exchange,which has large heat loss in the high-pressure storage stage and excessive heat replenishment in the low-pressure storage stage.On the premise of a comprehensive analysis of the rationality of the theoretical basis of the thermodynamic model for underground cavern,the root causes of the deviations in the heat calculation are analyzed,the improvement methods are proposed and the rationality of the improved models are verified through 3 cases.[Findings]The results show that the existing analytical model of thermodynamic calculation ignores the uneven temperature distribution of CAES underground gas storage during operation,causing distortion of the convective heat transfer model between the cavern wall and the compressed air,which is the root cause of the temperature calculation error.The problem of excessive temperature calculation deviation in the air storage stage can be better solved by the mixed convective heat transfer model.[Conclusions]The results of several analytical cases prove the rationality of the improved model proposed in this paper,which can provide a calculation basis for the volume optimization design and efficiency analysis of CAES underground gas storage.

关 键 词：压缩空气储能 地下储气库 热力学改进模型 自然对流换热 强迫对流换热 混合对流换热 

分 类 号：TK82[动力工程及工程热物理—流体机械及工程]