储能科学与技术 ›› 2020, Vol. 9 ›› Issue (3): 892-900.doi: 10.19799/j.cnki.2095-4239.2019.0224

• 储能系统与工程 • 上一篇    下一篇

基于储能效率分析的CAES地下储气库容积分析

蒋中明1,2(), 郭菁1, 唐栋1,3   

  1. 1. 长沙理工大学水利工程学院
    2. 长沙理工大学水沙科学与水灾害防治湖南省重点实验室
    3. 长沙理工大学洞庭湖水环境治理与生态修复湖南省重点实验室,湖南 长沙 410114
  • 收稿日期:2019-10-09 修回日期:2019-10-31 出版日期:2020-05-05 发布日期:2019-11-05
  • 作者简介:蒋中明(1969—),男,教授,主要从事能源地下存储及开发工作,E-mail:zzmmjiang@163.com
  • 基金资助:
    国家自然科学基金(51778070);湖南省研究生科研创新项目(CX20190678)

Cavern volume of CAES system based on energy efficiency analysis

JIANG Zhongming1,2(), GUO Jing1, TANG Dong1,3   

  1. 1. School of Hydraulic Engineering, Changsha University of Science & Technology
    2. Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province, Changsha University of Science & Technology
    3. Open Research Fund of Science and Technology Innovation Platform of Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, Changsha University of Science & Technology, Changsha 410114, Hunan, China
  • Received:2019-10-09 Revised:2019-10-31 Online:2020-05-05 Published:2019-11-05

摘要:

地下储气库容积大小是大规模压缩空气储能(compressed air energy storage,CAES)电站规划设计的基础性参数之一。为准确确定与电站装机容量相匹配的定容储气库容积,在地下储气库内压缩空气?的计算方法基础上,推导了地下储气库储能效率计算公式,并提出了基于储气库储能效率、膨胀装置效率和机组发电效率分析的储气库容积确定方法。利用算例验证了算法的正确性与合理性,在此基础之上,定量分析了影响储气库储能效率和容积大小的主要因素。研究结果表明:储能效率均随充放气循环次数的增加逐渐上升,上升趋势在后期趋于平缓。储气库泄漏量对储能效率影响较大,泄漏量越大,储能效率越低。总体上储气库运行压力差和密封层对流换热系数越大,储气库储能效率越高,但运行压力差达到一定数值后,提高运行压力差对储能效率的提高作用有限。储能效率越高、运行压力差越大,所需地下储气库的容积越小。在机组设备能力允许的情况下,应优选运行压力高、运行压力差大的设备运行方案,以减少储气库的建设费用。

关键词: 压气储能, 地下储气库, 储能效率, 储气库库容

Abstract:

The volume of an underground air-storage cavern is a basic parameter in the planning and engineering of large-scale compressed-air energy-storage power stations. The volume of an isochoric air-storage cavern must be accurately matched with the installed capacity of the power station. This work calculates the energy storage of compressed air in the cavern and determines the energy storage efficiency of the cavern. Based on the energy storage efficiency, it calculates the cavern volume and finally derives the efficiency of the expansion device and the power generation efficiency of a generator set. To assess the correctness and rationality of the calculation method, the main factors affecting the energy storage efficiency and volumetric quantity of the cavern were quantified in numerical examples. As the operation cycles proceeded, the energy storage efficiency gradually improved and the variations decreased, reaching stability in the later stage. The energy storage efficiency decreased with increasing leakage amount of compressed air, and was enhanced by increasing the coefficient of convective heat transfer. The operation pressure difference also increased the energy storage efficiency up to a certain value. Increasing both the storage efficiency and the operation pressure difference reduced the cavern volume that matched the installed capacity. Therefore, to decrease the construction cost of the cavern, the operation scheme should increase the operating pressure and the operating pressure difference as much as possible.

Key words: compressed air energy storage, underground air storage cavern, energy storage efficiency, cavern volume

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