【Q&A Question 342】December 26, 2017
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【Q&A Question 342】December 26, 2017: Causes of converter tube penetration and corresponding treatment methods. Reason: ① Defects in the material itself. ②There are problems with the welding joints during construction. ③Local overheating causes burn-through. ④The service life of the furnace tube is approaching its end. Action: Stop operations. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) For management purposes, if you need to view content from a few days ago, please go through the summary post below. 2017 Q&A Summary Thread (updates have begun) https://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates have begun) https://bbs.hcbbs.com/thread-1657794-1-1.html 2017 Daily Image Summary Thread https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1875160 2017 LNG Version Daily Question Catalog https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1804162 2016 Q&A Summary Thread (updates completed) https://bbs.hcbbs.com/thread-1597792-1-1.html
High-temperature operation and short-term localized overheating are the direct causes of high-temperature creep failure in furnace tubes
The material itself has defects, there are issues with the welding joints, local overheating has caused burn-through, and the furnace tube is nearing the end of its service life. Shut down for maintenance.
Excessive furnace temperature, improper water-to-carbon ratio, and uneven flame combustion; in such cases, an emergency shutdown is the only option after penetration occurs
①The material itself has defects. ②There are problems with the welding joints during construction. ③Local overheating causes burn-through. ④The service life of the furnace tube is approaching its end. Action: Stop operations.
①The material itself has defects. ②There are problems with the welding joints during construction. ③Local overheating causes burn-through. ④The service life of the furnace tube is approaching its end. Treatment: Stop operations
①The material itself has defects. ②There are problems with the welding joints during construction. ③Local overheating causes burn-through. ④The service life of the furnace tube is approaching its end. Treatment: Stop operations
Reason: Imbalanced water-to-carbon ratio； The furnace temperature is too low, resulting in carbon buildup ； Long usage time, exceeding the service life ； Due to issues with the raw material pretreatment system, the sulfur content and olefins in the raw materials exceed the specified limits
①The material itself has defects. ②There are problems with the welding joints during construction. ③Local overheating causes burn-through.