Numerical Study on Flow and Thermal Characteristics of High-Voltage Molten Salt Electric Heater Applied in Large-Scale Energy Storage

IF 3.5 3区工程技术 Q3 ENERGY & FUELS

Energy Science & Engineering Pub Date : 2025-02-11 DOI:10.1002/ese3.70006

Yujie Qiu, Miao Yu, Keliang Liu, Dazhuan Wu, Yuegang Shi

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Abstract

The overheating phenomenon is a common issue in molten salt electric heaters (MSEHs), significantly limiting their application in large-scale energy storage systems. To address this, a three-dimensional analysis model of a high-voltage resistance MSEH is developed using ANSYS Fluent. This study focuses on the overheating issue in the molten salt, investigating the fluid flow and temperature distribution within the electric heater. A multi-zone heating method is proposed, and the heating proportions of different zones are examined in detail. Based on this, the influence of structural parameters is analyzed. The results demonstrate that the multi-zone heating method eliminates the overheating phenomenon in the MSEH and improves temperature uniformity. The maximum temperature of the MSEH decreases from 622.6°C to a maximum of 583.4°C with the multi-zone heating method. The optimal heating proportion of 80-20/2.0 results in a maximum temperature that is only 14.9°C higher than the outlet temperature. The analysis of structural parameters offers valuable guidance for MSEH design. This study successfully suppresses local overheating in the MSEH, efficiently evaluates heating capacity, and ensures system safety. Therefore, this work provides significant insights for MSEH design and promotes its application in large-scale energy storage systems.

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大型储能用高压熔盐电加热器流动与热特性数值研究

过热现象是熔盐电加热器（MSEHs）普遍存在的问题，严重限制了其在大型储能系统中的应用。为了解决这一问题，利用ANSYS Fluent软件建立了高压电阻MSEH的三维分析模型。本文研究了熔盐过热问题，研究了电加热器内的流体流动和温度分布。提出了一种多区域供热方法，并详细分析了不同区域的供热比例。在此基础上，分析了结构参数的影响。结果表明，多区加热消除了MSEH内的过热现象，提高了温度均匀性。在多区加热方式下，MSEH的最高温度从622.6℃降至583.4℃。当加热比例为80-20/2.0时，最高温度仅比出口温度高14.9℃。结构参数分析对MSEH的设计具有重要的指导意义。该研究成功地抑制了MSEH的局部过热，有效地评估了供热能力，并确保了系统的安全性。因此，该工作为MSEH设计提供了重要的见解，并促进了其在大型储能系统中的应用。

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

Energy Science & Engineering Engineering-Safety, Risk, Reliability and Quality

CiteScore

6.80

自引率

7.90%

发文量

298

审稿时长

11 weeks

期刊介绍： Energy Science & Engineering is a peer reviewed, open access journal dedicated to fundamental and applied research on energy and supply and use. Published as a co-operative venture of Wiley and SCI (Society of Chemical Industry), the journal offers authors a fast route to publication and the ability to share their research with the widest possible audience of scientists, professionals and other interested people across the globe. Securing an affordable and low carbon energy supply is a critical challenge of the 21st century and the solutions will require collaboration between scientists and engineers worldwide. This new journal aims to facilitate collaboration and spark innovation in energy research and development. Due to the importance of this topic to society and economic development the journal will give priority to quality research papers that are accessible to a broad readership and discuss sustainable, state-of-the art approaches to shaping the future of energy. This multidisciplinary journal will appeal to all researchers and professionals working in any area of energy in academia, industry or government, including scientists, engineers, consultants, policy-makers, government officials, economists and corporate organisations.