Thermal and mechanical stresses in a solar central receiver

A. Montoya, M. R. Rodríguez-Sánchez, J. López-Puente, D. Santana
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引用次数: 4

Abstract

Failure in the tubes of the solar receiver is a problem that should be studied. This failure is caused by the combined action of the high temperature, stresses and corrosion. Commonly, the calculation of the stresses in the receiver tubes is carried out in the crossed sections, taking into account the radial and the circumferential variation of the temperature. However, the temperature gradient along the tube length has been ignored. In this study a new model for the stress calculation in the receiver tubes has been developed. This model includes the temperature gradient in circumferential, radial, and longitudinal direction, taking into account the movement restrictions. The results show that the mechanical boundary conditions have a large effect in the stresses of the tube, being 3 times higher than the stress when no movement restrictions have been imposed. Moreover, the stress profile is highly dependent on the temperature gradient and hence on the incident solar flux on the receiver. Homogeneous solar fluxes are then more suitable than lower levels of solar fluxes with important gradients.
太阳能中央接收器的热应力和机械应力
太阳能接收器管的失效是一个应该研究的问题。这种破坏是由高温、应力和腐蚀共同作用造成的。通常,在考虑径向和周向温度变化的情况下,计算接收管内的应力在截面上进行。然而,沿管长方向的温度梯度被忽略。本文提出了一种新的接收管应力计算模型。该模型包括考虑运动限制的圆周、径向和纵向的温度梯度。结果表明:机械边界条件对管材的应力影响较大,比不加运动限制时的应力大3倍;此外,应力分布高度依赖于温度梯度,因此依赖于入射到接收器上的太阳通量。因此,均匀的太阳通量比具有重要梯度的较低水平的太阳通量更合适。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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