通过建立熔盐储罐的热模型与应力模型,考虑热力耦合变液作用下,罐壁与底板支撑刚度对储罐力学性能的影响。结果表明,不同液位储罐的温度分布大体一致,底板外伸焊缝位置与拱顶连接位置存在最大温差,约为4 ℃。静水压力主要影响罐体的沉降,满载工况下最大沉降量约0.2 m。热应力主要影响罐体径向位移,最大径向位移约为0.28 m。增加罐底刚度,有助于减小罐体的沉降与应力,底部最优设计刚度为5 MPa/m。罐体形变对罐壁刚度的变化不敏感,而且罐壁刚度的增加导致应力急剧增加,因此,不可限制由于热应力引起罐体产生的径向位移。该文研究结果可为实际大型高温熔盐储罐的设计提供理论指导。
Abstract
This paper establishes thermal and stress models for molten salt storage tanks, and investigates the effects of the support stiffness of tank walls and bottom plates on the mechanical properties of storage tanks under the action of thermal-mechanical coupling and variable liquid levels. The results show that the temperature distribution of storage tanks with different liquid levels is roughly consistent, and the maximum temperature difference of approximately 4 ℃ exists at the position of the outward-extending weld of the bottom plate and the connection position of the dome roof. Hydrostatic pressure mainly affects the settlement of the tank body, with the maximum settlement amount being about 0.2 m under the full-load condition. Thermal stress mainly affects the radial displacement of the tank body, and the maximum radial displacement is approximately 0.28 m. Increasing the stiffness of the tank bottom is conducive to reducing the settlement and stress of the tank body, and the optimal design stiffness of the bottom is 5 MPa/m. The deformation of the tank body is insensitive to the change of tank wall stiffness, and the increase of tank wall stiffness leads to a sharp increase in stress. Therefore, it is not advisable to restrict the radial displacement of the tank body caused by thermal stress. The research results of this paper can provide theoretical guidance for the design of practical large-scale high-temperature molten salt storage tanks.
关键词
太阳能热发电 /
太阳能 /
热应力 /
数值分析 /
刚度 /
温度分布
Key words
concentrating solar power /
solar energy /
thermal stress /
numerical analysis /
stiffness /
temperature distribution
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] 张晓明, 吴玉庭, 张灿灿. 大型熔盐罐结构设计、温度分布与强度分析[J]. 北京工业大学学报, 2021, 47(9): 1064-1073.
ZHANG X M, WU Y T, ZHANG C C.Temperature distribution and strength analysis of large-scale molten salt thermal storage tank[J]. Journal of Beijing University of Technology, 2021, 47(9): 1064-1073.
[2] 岳松, 陈宇轩, 肖虎, 等. 熔盐储罐预热过程优化研究[J]. 太阳能学报, 2022, 43(10): 113-118.
YUE S, CHEN Y X, XIAO H, et al.Study on optimization of preheating process of molten salt storage tank[J]. Acta energiae solaris sinica, 2022, 43(10): 113-118.
[3] WANG G, YU S Y, NIU S Q, et al.A comprehensive parametric study on integrated thermal and mechanical performances of molten-salt-based thermocline tank[J]. Applied thermal engineering, 2020, 170: 115010-115023.
[4] WANG G, YU S Y, NIU S Q, et al.An integrated thermal and mechanical performance analysis of effect of cold molten salt temperature for thermocline tank[J]. International journal of thermophysics, 2019, 40(11): 1-16.
[5] 杜保存, 黄丽娟, 雷勇刚, 等. 填充床熔盐蓄热器的动态温度与应力特性[J]. 储能科学与技术, 2022, 11(7): 2141-2150.
DU B C, HUANG L J, LEI Y G, et al.Dynamic study on the thermal and stress performances of the molten salt packed-bed thermal storage tank[J]. Energy storage science and technology, 2022, 11(7): 2141-2150.
[6] DU B C, GUO Y F, XU C, et al.Dynamic creep and stress performances of the packed-bed thermal energy storage tank with molten salt EPCM particles[J]. Applied thermal engineering, 2023, 225: 120247-120258.
[7] WAN Z J, WEI J J, QAISRANI M A, et al.Evaluation on thermal and mechanical performance of the hot tank in the two-tank molten salt heat storage system[J]. Applied thermal engineering, 2020, 167: 114775-114786.
[8] 蔡君, 刘长军, 郭洪辛, 等. 循环载荷作用下的高温熔盐储罐设计分析[J]. 太阳能学报, 2023, 44(4): 516-521.
CAI J, LIU C J, GUO H X, et al.Design and analysis of high temperature molten-salt storage tank under cyclic loading[J]. Acta energiae solaris sinica, 2023, 44(4): 516-521.
[9] HUANG L J, DU B C, LEI Y G.Coupled thermal and mechanical dynamic performances of the molten salt packed-bed thermal energy storage system[J]. Journal of thermal science, 2022, 31(5): 1337-1350.
[10] OUYANG Y M, LI Y H, ZHANG Y P.Numerical research on the thermal characteristics and mechanical properties of a molten-salt single tank storage system[J]. Journal of energy storage, 2024, 80: 110328-110343.
[11] 曾鑫, 蔡君, 郑维栋, 等. 基于风险指引的光热电站高温熔盐储罐结构强度设计研究[J]. 机械强度, 2022, 44(3): 676-683.
ZENG X, CAI J, ZHENG W D, et al.Risk-informed strength design of hot molten salt storage tank for csp plants[J]. Journal of mechanical strength, 2022, 44(3): 676-683.
[12] SUÁREZ C, IRANZO A, PINO F J, et al. Transient analysis of the cooling process of molten salt thermal storage tanks due to standby heat loss[J]. Applied energy, 2015, 142: 56-65.
[13] OSORIO J D, MEHOS M, IMPONENTI L, et al.Failure analysis for molten salt thermal energy storage tanks for in-service CSP plants[R]. United States, 2024.
[14] LI M J, LI M J, TONG Z X, et al.Optimization of the packed-bed thermal energy storage with cascaded PCM capsules under the constraint of outlet threshold temperature[J]. Applied thermal engineering, 2021, 186: 116473-116485.
[15] SATHYANARAYANAN S, ADLURI S M R. Incorporation of friction coefficient in the design equations for elevated temperature tanks[J]. Journal of pressure vessel technology, 2013, 135(2): 021205-021213.
[16] RELLOSO S, DELGADO E.Experience with molten salt thermal storage in a commercial parabolic trough plant.Andasol-1 commissioning and operation[C]//Proceedings of the 15th SolarPACES Conference. Berlin,Germany,2009.
[17] ARAÚJO A K A, MEDINA T G I. Analysis of the effects of climatic conditions, loading level and operating temperature on the heat losses of two-tank thermal storage systems in CSP[J]. Solar energy, 2018, 176: 358-369.
[18] ZAVERSKY F, GARCÍA-BARBERENA J, SÁNCHEZ M, et al. Transient molten salt two-tank thermal storage modeling for CSP performance simulations[J]. Solar energy, 2013, 93: 294-311.
[19] BRADSHAW R W, DAWSON D B, ROSA W D L, et al. Final test and evaluation results from the solar two project[R].Sandia National Laboratories ,SAND2002-0120, 2002.
基金
中国三峡新能源（集团）股份有限公司科研项目资助（合同编号： 63034202B01）
PDF(1299 KB)
