School of Energy Power and Mechanical Engineering, North China Electric Power University
School of Energy and Power Engineering, Lanzhou University of Technology

太阳能是地球表面最丰富的清洁可再生能源,太阳能利用是全球可再生能源发展战略最重要的组成部分,将聚光太阳能发电(CSP)与热能储存(TES) 耦合产生可调度的清洁电力是实现能源低碳转型的重要途径之一。 太阳能光热电站的能量转换效率和功率成本是上述技术的制约因素。 以熔融盐为代表,开发具有更高工作温度(> 565 ℃)的热能储存(TES) / 传热流体(HTFs)系统是提升太阳能光热发电效率的重要技术途径。 其中,氯盐被认为是下一代最有希望实现更高效率和更低成本的 TES / HTF 体系之一。 基于目前氯盐的研究现状,本文探讨了氯盐的基础研究和当前的发展策略,主要包括氯盐的热性能、腐蚀机理和缓解腐蚀的策略。 分析结果表明,熔盐的最大工作温度是决定 TES 系统效率的关键。 然而,金属结构材料在熔盐中的腐蚀限制了氯盐的发展。 在高温熔盐中,抑制金属结构材料腐蚀的主要手段为氯盐提纯和加入缓蚀剂。

Solar energy is the most abundant clean renewable energy on the surface of earth. Solar ener⁃gy utilization is the most important part of the global renewable energy development strategy. Couplingconcentrating solar power ( CSP) with thermal energy storage ( TES) to produce schedulable cleanpower is one of the important ways to achieve low-carbon transition of energy. Energy conversion effi⁃ciency and power costs hold the key to solar thermal power plants. Taking molten salt as an example,the development of thermal energy storage (TES) / heat transfer fluids (HTFs) systems with higher op⁃erating temperature ( > 565 ℃) is of great importance to improving the efficiency of solar thermalpower generation. Chloride salt is considered to be one of the most promising TES / HTF systems for thenext generation to achieve higher efficiency and lower cost. Based on the current research status of chlo⁃ride salt, this paper discusses the basic research and development strategy of chloride salt, includingthe thermal properties, corrosion mechanism and corrosion mitigation strategy. The results show that themaximum operating temperature of molten salt is the key to determining the efficiency of TES system.However, the corrosion of metal structural materials in molten salts limits the development of chloridesalt. In high temperature molten salt, the main means to inhibit the corrosion of metal structural materi⁃als are purification of chloride salt and addition of corrosion inhibitor.

国家自然科学基金(52130607,52090062);甘肃省教育厅“双一流”重点项目(GCJ2022-38)

赵乐, 杜小泽. 聚光太阳能电站中氯盐作为传热流体的研究进展[ J]. 能源环境保护, 2023, 37(1):130-140.

ZHAO Le, DU Xiaoze. Research progress of chloride salt as heat transfer fluid in concentrating solar power plant[J]. Energy Environmental Protection, 2023, 37(1): 130-140.