Stress calculation for supports and hangers of molten salt pipelines in solar thermal power stations

doi:10.3969/j.issn.2097-0706.2022.04.011

Abstract

Abstract:

Concentrating solar power plants is prospering against the backdrop of achieving carbon neutrality,but stress concentration is an important issue that dampens the reliability of pipelines. Among the reasons for the problem, an important one is that the high and volatile operating temperature of molten salt pipelines in concentrating solar power plants generates large thermal stress. Based on the case of a CSP station, the stress of its pipe support and hanger is calculated by ANSYS Workbench. According to the constructed 3D finite model of the pipe support and hanger, stress calculations and analyses were conducted for the model under various steady and transient conditions. The results show that the most dangerous working condition is the extreme cloud cover condition under which the maximum stress can reach 233 MPa.And the stress concentration appears inside the protective plate and on the pipelines between protective plates,where the local primary membrane stress and bending stress exceed the safe range. The corresponding optimization scheme for the pipe support and hanger is taking clamping structure.The proposed structure can secure the stress within a safe range.

Key words: pipe support and hanger, stress calculation, structural optimization, concentrating solar power plant, finite element model, clean energy, new power system, carbon neutrality, molten salt

CLC Number:

TK512：TM615

CHEN Zehong, LIAO E, WU Lei, CAO Qi, CHEN Guoqiang, DU Guanghan, LIU Guixiu, LI Gen. Stress calculation for supports and hangers of molten salt pipelines in solar thermal power stations[J]. Integrated Intelligent Energy, 2022, 44(4): 85-91.

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工况		描述
稳态工况	稳态运行工况	机组正常运行时的工况,管道内的熔融盐温度为585.00 ℃
稳态工况	稳态停机工况	机组停止运行后的工况,管道内的熔融盐温度为270.00 ℃
瞬态工况	瞬态启动工况	机组启动过程中的瞬态工况,熔融盐的温度在1 180 s内从270.00 ℃升温至565.00 ℃,升温速率为15 ℃/min,每天发生1次
	瞬态停机工况	机组停止运行过程中的瞬态工况,熔融盐的温度在1 180 s内从565.00 ℃降温至270.00 ℃,降温速率为15 ℃/min,每天发生1次
	低温运行工况	机组进行降温过程中的瞬态工况,熔融盐的温度在75 s内从450.00 ℃降温至290.00 ℃,降温速率为128 ℃/min
	极限云遮工况	机组温度变化最剧烈的降温工况,熔融盐的温度在75 s内从585.00 ℃降温至290.00 ℃,降温速率为236 ℃/min,每年发生30次

项目	一次局部薄膜应力/MPa	薄膜应力+弯曲应力/MPa	总应力/MPa	校核结果
评定标准	206.85	206.85	413.70
路径A	56.53	232.12	253.86	不安全
路径B	58.54	169.69	205.34	安全
路径C	69.33	171.88	172.06	安全

项目	管道上端面	管道下端面
D_x/mm	-4.081	-13.274
D_y/mm	138.670	138.560
D_z/mm	31.712
R_z/（°）	-0.44	-0.47
F_x/N	1 010	-27 470
F_y/N	38 287	5 794
F_z/N	-82 884	88 954

应力类型	计算结果/ MPa	评定标准/ MPa	评定结果
一次局部薄膜应力	57.90	206.85	安全
一次局部薄膜应力+弯曲应力	204.59	206.85	安全
总应力	218.01	413.70	安全

项目	一次局部薄膜应力/MPa	薄膜应力+弯曲应力/MPa	总应力/MPa	评定结果
评定标准	206.85	206.85	413.70	—
稳态运行工况	62.93	100.18	98.25	安全
稳态停机工况	62.57	85.03	83.80	安全
瞬态启动工况	61.44	135.85	128.07	安全
瞬态停机工况	63.63	99.97	106.53	安全
低温运行工况	60.64	121.89	140.07	安全