System-level performance optimization of molten-salt packed-bed thermal energy storage for concentrating solar power
文献类型：期刊论文
| 作者 | Zhao, BC; Cheng, MS; Liu, C; Dai, ZM |
| 刊名 | APPLIED ENERGY
 |
| 出版日期 | 2018 |
| 卷号 | 226期号:-页码:225-239 |
| 关键词 | PHASE-CHANGE MATERIALS PCM CAPSULES LATENT-HEAT PLANTS COST SIMULATION OPERATION |
| ISSN号 | 0306-2619 |
| DOI | 10.1016/j.apenergy.2018.05.081 |
| 文献子类 | 期刊论文 |
| 英文摘要 | Molten-salt packed-bed thermal energy storage using thermocline technology is more cost-competitive than the conventional two-tank thermal energy storage, due to its integrated design and the employment of a low-cost packed-bed. However, such a storage configuration suffers the main drawback of a low capacity factor when applied to concentrating solar power because of the adoption of conservative cut-off temperatures. The present work evaluates the feasibility of taking less conservative cut-off temperatures to improve the utilization of the packed-bed thermal energy storage from the perspectives of a system-level operation and storage economy. The investigations are carried out on two levels. The first-level investigation reveals the effects of both the charging and discharging cut-off temperature on the thermal performance of the packed-bed thermal energy storage under ideal operating conditions. Three typical packed-bed configurations are involved. The results show that the capacity factor of the packed-bed thermal energy storage increases as the charging cut-off temperature increases and the discharging cut-off temperature decreases, especially for the configurations using latent-heat when the adopted cut-off temperatures jump over the phase change points of the encapsulated phase change materials. The second-level investigation discusses the impacts of different levels of deep charges (using high charging cut-off temperatures) on the scale design of the packed-bed thermal energy storage, the daily operation of the low temperature molten-salt pump (LT-pump) and the central receiver of a 100 MWe conventional concentrating solar power tower plant. The results indicate that a deeper charge operation is always accompanied with a smaller required packed-bed size as well as a higher required delivery capacity and higher pressure head of the LT-pump and that it always results in a larger daily pumping consumption, a higher peak inlet temperature ramping rate and a higher receiver pressure drop. The maximum allowable charging cut-off temperature is identified to be 500 degrees C for each packed-bed configuration, according to the operating limitations on the pump and receiver. Moreover, a cost analysis is carried out to obtain the optimum charging cut-off temperature for each packed-bed configuration. The obtained results show that performing deep charges with the cost-optimized charging cut-off temperatures can effectively improve the cost competitiveness of the molten-salt packed-bed TES integrated into concentrating solar power plants. |
| 语种 | 英语 |
| 源URL | [http://ir.sinap.ac.cn/handle/331007/31131]  |
| 专题 | 上海应用物理研究所_中科院上海应用物理研究所2011-2017年 |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhao, BC,Cheng, MS,Liu, C,et al. System-level performance optimization of molten-salt packed-bed thermal energy storage for concentrating solar power[J]. APPLIED ENERGY,2018,226(-):225-239. |
| APA | Zhao, BC,Cheng, MS,Liu, C,&Dai, ZM.(2018).System-level performance optimization of molten-salt packed-bed thermal energy storage for concentrating solar power.APPLIED ENERGY,226(-),225-239. |
| MLA | Zhao, BC,et al."System-level performance optimization of molten-salt packed-bed thermal energy storage for concentrating solar power".APPLIED ENERGY 226.-(2018):225-239. |
入库方式： OAI收割
来源：上海应用物理研究所
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