一段转化炉管
A section of the conversion furnace tube
以上为机器翻译结果，长、整句建议使用 人工翻译 。
通过对一段转化炉管外壁超温原因的分析，制定相应的防范措施，以延长其使用寿命。
By analyzing the causes for overheating of the external wall of the primary reformer tubes, preventive measures have been taken accordingly, so as to prolong their service life.
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