太阳能光热电站熔融盐管道支吊架应力分析

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

太阳能光热电站在碳中和背景下将迎来新的发展机遇,而应力集中问题严重影响其管道运行可靠性。其中一个重要原因是太阳能光热电站熔融盐管道运行温度高、温度变化剧烈会产生较大的热应力。以某光热电站为为例,利用ANSYS Workbench软件对其管道支吊架的应力情况进行了计算分析,通过建立熔融盐管道支吊架的三维有限元模型,对各种稳态和瞬态工况进行了应力计算和分析。护板式结构在最危险的极限云遮工况下,最大应力可达约233 MPa,其中护板内部和2块护板之间的管道部分存在应力集中的现象,一次局部薄膜应力和弯曲应力超过了安全范围,存在安全问题。对支吊架进行了结构优化,并采用了管夹式结构。该优化方案可将应力控制在安全范围内,优化效果明显。

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.