Design of a Combined Heat Store and Heat Exchanger for CAES Systems

IF 2.6 4区 工程技术 Q3 ENERGY & FUELS
Bruno Cardenas, Seamus Garvey, James Rouse, Zahra Baniamerian, Daniel Pottie, Edward Barbour
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Abstract

A combined heat store and heat exchanger unit (HSX) intended for compressed air energy storage (CAES) is presented. The unit is directly charged by the pressurised air emerging from the compression train, which removes the need for a secondary low-pressure air circuit. Salt is used as the thermal storage medium due to its good heat capacity, thermal conductivity, and its ability to accommodate the thermal expansion of the stainless-steel pipes. This paper uses a CAES system (15 MW, 12-h discharge) driven by an offshore wind turbine as a case study. There are not many commercial CAES systems in operation; however, the levelized cost of the heat storage subsystem of a CAES system (i.e. heat store, set of heat exchangers and ancillary low-pressure circuit) ranges between 45 and 48 £/MWh. Findings show that the most cost-effective design for a HSX has a capital cost of ∼£55k. This translates into a levelized cost of storage of ∼31.5 £/MWh. The roundtrip exergy efficiency of this design is 93.7 %. This accounts for heat-exergy and pressure-exergy losses; losses to ambient are not considered. A HSX unit can considerably reduce the overall cost of a CAES system.

CAES系统中储热和换热器的组合设计
提出了一种用于压缩空气储能(CAES)的组合储热和热交换器单元(HSX)。该装置由压缩系统产生的加压空气直接充电,从而消除了二次低压空气回路的需要。由于盐具有良好的热容量、导热性和适应不锈钢管热膨胀的能力,因此采用盐作为储热介质。本文以海上风力发电机驱动的CAES系统(15mw, 12h放电)为例进行了研究。在运行的商用CAES系统并不多;然而,CAES系统的蓄热子系统(即蓄热、热交换器组和辅助低压回路)的平均成本在45至48英镑/兆瓦时之间。研究结果表明,HSX最具成本效益的设计的资本成本约为5.5万英镑。这意味着平均存储成本为31.5英镑/兆瓦时。本设计的往返火用效率为93.7%。这说明了热用和压用损失;不考虑对环境的损失。HSX单元可以大大降低CAES系统的总体成本。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
IET Renewable Power Generation
IET Renewable Power Generation 工程技术-工程:电子与电气
CiteScore
6.80
自引率
11.50%
发文量
268
审稿时长
6.6 months
期刊介绍: IET Renewable Power Generation (RPG) brings together the topics of renewable energy technology, power generation and systems integration, with techno-economic issues. All renewable energy generation technologies are within the scope of the journal. Specific technology areas covered by the journal include: Wind power technology and systems Photovoltaics Solar thermal power generation Geothermal energy Fuel cells Wave power Marine current energy Biomass conversion and power generation What differentiates RPG from technology specific journals is a concern with power generation and how the characteristics of the different renewable sources affect electrical power conversion, including power electronic design, integration in to power systems, and techno-economic issues. Other technologies that have a direct role in sustainable power generation such as fuel cells and energy storage are also covered, as are system control approaches such as demand side management, which facilitate the integration of renewable sources into power systems, both large and small. The journal provides a forum for the presentation of new research, development and applications of renewable power generation. Demonstrations and experimentally based research are particularly valued, and modelling studies should as far as possible be validated so as to give confidence that the models are representative of real-world behavior. Research that explores issues where the characteristics of the renewable energy source and their control impact on the power conversion is welcome. Papers covering the wider areas of power system control and operation, including scheduling and protection that are central to the challenge of renewable power integration are particularly encouraged. The journal is technology focused covering design, demonstration, modelling and analysis, but papers covering techno-economic issues are also of interest. Papers presenting new modelling and theory are welcome but this must be relevant to real power systems and power generation. Most papers are expected to include significant novelty of approach or application that has general applicability, and where appropriate include experimental results. Critical reviews of relevant topics are also invited and these would be expected to be comprehensive and fully referenced. Current Special Issue. Call for papers: Power Quality and Protection in Renewable Energy Systems and Microgrids - https://digital-library.theiet.org/files/IET_RPG_CFP_PQPRESM.pdf Energy and Rail/Road Transportation Integrated Development - https://digital-library.theiet.org/files/IET_RPG_CFP_ERTID.pdf
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