Analyses of alternate skirt attachments to coke drums
Analyses of alternate skirt attachments to coke drums
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焦炭塔替代裙边附件的分析
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
J. Taagepera
中科院分区：
文献类型：
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作者：
L. Antalffy;J. Baxter;D. Malek;K. Bardia;J. Taagepera
焦炭塔裙板与筒体连接处是焦炭塔裂纹最敏感的部位之一。由于汽包加热和淬火产生的剧烈热循环以及汽包内作用于裙座几何形状的循环压应力将导致裙座与壳体连接处的应力强度集中。本文研究了四种焦炭塔裙座连接方式，即：传统的塔锥角焊缝连接方式、塔筒外侧角焊缝连接方式、改进的裙座连接方式（裙座采用外焊缝与内圆角打底焊缝连接方式）、外焊缝与内圆角打底焊缝连接方式、外焊缝与内圆角打底焊缝连接方式、外焊缝与内圆角打底焊缝连接方式。以及一种设计，其中裙部通过整体轮廓机加工板连接到鼓壳，裙部连接短柱在该整体轮廓机加工板中机加工。在每种情况下，确定裙部中的热梯度和随后的热应力强度。提供了每个接头中的总应力强度的比较，以评估每个设计的比较优势。还确定了裙部开槽的影响，以减轻裙部的总应力强度水平。
One of the most sensitive areas to cracking in coke drums is the skirt to shell attachment joint. The severe thermal cycling from drum heat up and quenching together with the cycling pressure stresses in the drum acting on the skirt geometry will cause large stress intensity concentrations at the skirt to shell junction. This paper investigates four types of skirt attachments to a coke drum, namely: the conventional fillet weld attachment to the drum cone; a fillet weld attachment to the outside of the vessel shell; a modified design where the skirt is attached by an externally blended weld build up with an internally radiused backing weld; and a design where the skirt is attached to the drum shell by an integral contour machined plate in which the skirt attachment stub is machined. In each case, the thermal gradient and the subsequent thermal stress intensity in the skirt are determined. A comparison of the total stress intensities in each joint is provided to evaluate the comparative advantages of each design. A determination is also made on the effects of slotting in the skirt to alleviate the total stress intensity level in the skirt.