Numerical investigation on simultaneous charging and discharging process of molten-salt packed-bed thermocline storage tank employing in CSP plants

doi:10.1016/j.renene.2020.11.139

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	Numerical investigation on simultaneous charging and discharging process of molten-salt packed-bed thermocline storage tank employing in CSP plants
	ELSihy, ELSaeed Saad 1; Wang, Xiaohui 1; Xu, Chao 1; Du, Xiaoze 1,2
刊名	RENEWABLE ENERGY
	2021
卷号	172 页码:1417-1432
关键词	Thermal energy storage Packed-bed Concentrated solar power Simultaneous charging discharging operation Thermocline
ISSN号	0960-1481
DOI	10.1016/j.renene.2020.11.139
英文摘要	Based on the local thermal non-equilibrium theory, a modified transient two-dimensional numerical model is developed to investigate the simultaneous charging and discharging performance of a molten salt packed-bed thermocline tank employed in concentrated solar power plants. Two different types of operation including that of stable and periodic charging with steady discharging are analyzed. Three different solid fillers are utilized, including quartzite rock, slag pebbles, and alumina ceramics. The effects of charging/discharging flow rate ratio and non-charging periods on thermocline thickness and energy storage power have been investigated. The results show significant influences of the charging/discharging flow rate ratio. When charging is steady, the discharge performance of a packed-bed tank is better than that of a pure molten-salt tank at lower flow rate ratios. The thermocline thickness of the packed-bed tank is higher than that of a pure molten-salt tank for different solid materials. Compared with quartzite rock and slag pebbles, alumina ceramics achieves a higher thermal gradient. In periodic charging mode, as the cycle & rsquo;s number of charging periods increases, thermocline thickness increases linearly. Operating at higher charging rates and shorter non-charging periods, the discharge outlet temperature of molten-salt becomes more stable for the steam generation process and hence, the discharge performance is improved. (c) 2020 Elsevier Ltd. All rights reserved.
WOS研究方向	Science & Technology - Other Topics ; Energy & Fuels
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000641142500009
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/148182]
专题	兰州理工大学
作者单位	1.North China Elect Power Univ, Key Lab Condit Monitoring & Control Power Plant E, Minist Educ, Beijing 102206, Peoples R China; 2.Lanzhou Univ Technol, Sch Energy & Power Engn, Lanzhou 730050, Peoples R China
推荐引用方式 GB/T 7714	ELSihy, ELSaeed Saad,Wang, Xiaohui,Xu, Chao,et al. Numerical investigation on simultaneous charging and discharging process of molten-salt packed-bed thermocline storage tank employing in CSP plants[J]. RENEWABLE ENERGY,2021,172:1417-1432.
APA	ELSihy, ELSaeed Saad,Wang, Xiaohui,Xu, Chao,&Du, Xiaoze.(2021).Numerical investigation on simultaneous charging and discharging process of molten-salt packed-bed thermocline storage tank employing in CSP plants.RENEWABLE ENERGY,172,1417-1432.
MLA	ELSihy, ELSaeed Saad,et al."Numerical investigation on simultaneous charging and discharging process of molten-salt packed-bed thermocline storage tank employing in CSP plants".RENEWABLE ENERGY 172(2021):1417-1432.