The temperature gradient on the top of the hydrogenation reactor skirt is very large. In order to find the relationship between the skirt thickness and the stress on top of the skirt, stress statuses for 11 models with different structural dimensions under five load combinations were analyzed. The results demonstrate that, under the load combination internal pressure + axial tensile stress, the largest stress in the skirt decreases with the increase of the skirt thickness. Under the other four load combinations, the largest stress in the skirt increases with the increase of the skirt thickness. Under the thermal load condition, the largest stress in the skirt can be as large as three times the original one with the increase of the skirt thickness. Under the load combination thermal + internal pressure + axial compressive stress, the largest stress in the skirt can be as large as two times the original one with the increase of the skirt thickness. Under the load combination thermal + internal pressure + axial tensile stress, the largest stress in the skirt can be as large as 1.15 times the original one with the increase of the skirt thickness. Overly conservative skirt thickness cannot increase the design safety; on the contrary, it will worsen the stress condition at the joint between the skirt and the shell. Thus, adopting thinner skirts while meeting the stress check and considering the lifting conditions will not only decrease the stress level, but also maximize economic benefits.

border:0px, font-size:14px, font-family:-apple-system, BlinkMacSystemFont, ", vertical-align:baseline, margin:0.859em 0px, color:#060607, background-color:#FFFFFF, "> hydrogenation reactor, skirt, thermal stress, thickness, temperature, internal pressure, axial compressive stress, axial tensile stress

加氢反应器裙座顶部温度梯度较大，为揭示裙座厚度与裙座顶部应力的关系，针对典型加氢反应器，建立了11个不同结构尺寸的分析模型，分析其在5个载荷工况作用下的应力状况。结果表明：在内压+轴向拉应力载荷工况下，裙座最大应力随裙座厚度的增加而减小，其他4种载荷工况下，裙座最大应力随裙座厚度的增加而增加。在温度载荷工况下，裙座拐角最大应力随裙座厚度增加变为原来的3倍左右；在温度+内压+轴向压应力载荷工况下，裙座最大应力随裙座厚度增加变为原来的2倍左右；在温度+内压+轴向拉应力载荷工况下，裙座最大应力随裙座厚度增加变为原来的1.15倍左右。过于保守的裙座厚度并不能带来安全的提升，相反会恶化裙座与筒体连接部位的应力状况。因此，在满足应力校核和已经考虑吊装需求的情况下，采用较薄的裙座既能使应力水平降低，又有利于最大限度地实现经济化。

border:0px, font-size:14px, font-family:-apple-system, BlinkMacSystemFont, ", vertical-align:baseline, margin:0.859em 0px, color:#060607, background-color:#FFFFFF, "> 加氢反应器, 裙座, 热应力, 厚度, 温度, 内压, 轴向压应力, 轴向拉应力