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首页> 外文会议>NACE annual conference & exposition >HIGH TEMPERATURE OXIDATION AND SULFIDATION DAMAGES OF A WASTE HEAT BOILER BYPASS DAMPER CONNECTED TO A SULFUR FURNACE
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HIGH TEMPERATURE OXIDATION AND SULFIDATION DAMAGES OF A WASTE HEAT BOILER BYPASS DAMPER CONNECTED TO A SULFUR FURNACE

机译：连接硫磺炉的废热锅炉旁通阻尼器的高温氧化和硫化损伤

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摘要

A damper from an internal bypass line in a waste heat boiler was removed during shutdown in afertilizer plant because of severe metal loss. The damper was connected to a sulfur furnace – itfailed due to detachment of the flapper from its hollow shaft. In the plant, sulfur is burnt in thefurnace (10511051°℃) to produce sulfur dioxide. The damper assembly consists of flapper and ahollow shaft which are fixed together using 3 pins. Chemical analysis showed that the flapperand hollow shaft material were constructed from SS 310 and SS 309 respectively, while thepins were made of plain carbon steel. The pins suffered premature, rapid, and severe hightemperature oxidation attack. Consequently, the sulfur dioxide gas leaked into the hollow shaftto inflict severe sulfidation and oxidation attacks. Cross-sectional microstructural examinationof the damaged hollow shaft revealed adherent deposits of oxide on the outer surface followedby layers of sulfidation damages penetrating through the bulk metal. X-ray mapping indicatedthat the sulfides were basically of chromium and iron and mainly present in the inner scale andin few grains in the base material. Remedial actions were suggested to mitigate the problem.
机译：在化肥厂关闭期间，由于严重的金属损失，拆除了废热锅炉内部旁路管线的风门。该风门已连接到硫磺炉上–由于挡板从其空心轴上脱离而失败。在工厂中，硫在炉（10511051°C）中燃烧产生二氧化硫。减震器组件由挡板和空心轴组成，它们通过3个销钉固定在一起。化学分析表明，襟翼和空心轴材料分别由SS 310和SS 309制成，而销由普通碳素钢制成。插针遭受过早，迅速和严重的高温氧化侵蚀。因此，二氧化硫气体泄漏到空心轴中，导致严重的硫化和氧化侵蚀。损坏的空心轴的横截面显微结构检查显示，在外表面上粘附有氧化物沉积物，随后穿过大块金属渗透了一层硫化损伤。 X射线作图表明，硫化物主要是铬和铁，主要存在于内部氧化皮中，并且在基体材料中几乎没有晶粒。建议采取补救措施以减轻该问题。

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