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Integrated Thermal Electricity Storage System: Energetic and cost performance

机译：集成式热电存储系统：能源和成本效益

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摘要

The spread of wind turbines and photovoltaic modules for green electricity generation is stressing the need of installing large-scale electricity energy storage. Among the in-developing storage technologies, those which store electricity in the form of thermal energy are considered the most promising due to the absence of geological restrictions and long cycle life. In this context, the Authors of the present work, developed a large-scale electricity energy storage unit which uses air as working fluid and stores electrical energy as sensible heat in a man-made tank. As other thermal storage technologies, the proposed one does not suffer of geographical limitations, is characterized by long cycle life and can be assembled with decommissioned devices originally designed for gas turbine plants. In this work, the Authors analyse the plant energetic performance and the construction cost for different storage materials and plant management strategies. Results show that the thermo-physical properties of the storage medium and the charging tolerance affect the plant performance and costs. For these reasons, it is essential selecting the material based on the plant purpose: if the plant works with daily charge/discharge cycle, packed bed made up by limestone or masonry material is suggested while, for weekly charge/discharge cycles, aluminium oxide can be a better storage option.
机译：用于绿色发电的风力涡轮机和光伏模块的普及，凸显了安装大型电能存储设备的需求。在开发中的存储技术中，由于没有地质条件的限制和较长的循环寿命，那些以热能形式存储电力的技术被认为是最有前途的。在这种情况下，本工作的作者开发了一种大型电能存储单元，该单元使用空气作为工作流体并将电能作为显热存储在人造水箱中。与其他蓄热技术一样，拟议的储热技术不受地域限制，具有使用寿命长的特点，并且可以与最初为燃气轮机厂设计的退役设备组装在一起。在这项工作中，作者分析了不同存储材料和工厂管理策略下的工厂能量性能和建设成本。结果表明，存储介质的热物理性质和充电耐受性会影响工厂的性能和成本。由于这些原因，必须根据工厂的用途选择材料：如果工厂每天进行充电/放电循环，建议使用石灰石或砖石材料制成的填充床，而对于每周的充电/放电循环，可以使用氧化铝成为更好的存储选择。

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