期刊
JOURNAL OF ENERGY STORAGE
卷 44, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.est.2021.103279
关键词
Cased-Wellbore (CW); Compressed Air Energy Storage (CAES); PA-CW-CAES Modeling; Geothermal; Long-term thermal energy storage
资金
- CleanTech Geomechanics Inc.
- MITACS
- Natural Sciences and Engineering Research Council of Canada (NSERC)
This study investigates a novel small-scale, site-flexible cased-wellbore compressed air energy storage (CW-CAES) system that can store both heat and mechanical energy, improving system efficiency. Analysis using numerical and semi-analytical models shows that the modeled partial adiabatic CW-CAES has a round-trip efficiency of around 40%, which increases with more charge/discharge cycles.
Although Compressed Air Energy Storage (CAES) is not a new technology, it has not yet been widely adopted due to location restrictions and inefficiencies. Thermal energy storage improves the round-trip efficiency of CAES systems. This study sets out to investigate the cyclic thermal storage behavior of a small-scale, site-flexible, scalable, cased-wellbore compressed air energy storage (CW-CAES) system in which both heat and mechanical energy can be stored in an array of wellbores. The concept of storing high-temperature compressed air (around 200 degrees C) inside cased wells is a promising approach to expanding the utility of CAES systems through site flexibility, partial adiabatic efficiency improvements over conventional non-adiabatic CAES, no need for a separate heat storage system as found in Adiabatic CAES (A-CAES) systems, and small (order 1 MW; 10 MWh) to large (order 150 MW; 600 MWh) capacity that can be achieved through the modular nature of multiple wellbores. This paper provides a detailed numerical model coupled with a semi-analytical model to assess the first year operation of PA-CW-CAES. The results reveal that the semi-analytical model yields results in excellent agreement with the numerical model. To improve thermal storage an array of boreholes is considered. Several charge/discharge cycles are used to appraise the system behavior and determine system efficiency. The simulations confirm that the modeled partial adiabatic CW-CAES has a round-trip efficiency of around 40% which is higher than the corresponding diabatic CW-CAES operating at the same conditions, and that this efficiency increases with time the more charge/discharge cycles CW-CAES experiences.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据