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柴油加氢装置通过加氢反应将柴油馏分中的噻吩等硫化物转化为硫化氢,通过闪蒸和蒸汽汽提的方式脱除柴油馏分中溶解的硫化氢。硫化氢汽提塔顶空冷普遍出现管束腐蚀穿孔的现象。荆门石化加氢改质装置由热高分调整为温高分流程,汽提塔空冷腐蚀严重,经常腐蚀穿孔,存在较大安全隐患。因此,拟通过对工艺条件进行调整,以降低硫化氢汽提塔顶空冷器腐蚀,延长设备使用寿命。 相似文献
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对炼油系统加氢裂化装置生产过程中高压空冷管束内壁介质结垢及腐蚀原因进行了分析。采用化学清洗方法对管束内壁的结垢及腐蚀产物进行清洗,提高了设备的换热效果,避免了金属表面的腐蚀,保证了装置的安全运行。 相似文献
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加氢裂化装置高压空冷腐蚀及阻垢缓蚀剂的试用 总被引:1,自引:0,他引:1
文章通过对加氢裂化装置高压空冷器腐蚀机理进行剖析,分析了管束失效的原因,并提出了在加氢裂化装置高压空冷器注水前加入YS-SR1275高压空冷阻垢缓蚀剂,通过对加氢裂化装置高压分离器污水在填加缓蚀剂前后数据比较,注入高压空冷缓蚀剂后,高压分离器的含硫污水铁离子含量较明显的下降,这表明高压空冷缓蚀剂降低了高硫原油对管线的腐蚀.通过数据比较,使用缓蚀剂前后产品质量均没出现异常状况,说明该缓蚀剂对产品质量不存在不利的影响. 相似文献
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注水泵是加氢裂化装置的关键设备,其作用是将软化水升压后送往高压空冷,溶解空冷管束中的氨盐。中海油惠州炼油360万吨/年中压加氢裂化装置注水泵选用喷射泵,此泵与传统的离心泵和往复泵相比,在结构上有较大区别。文章首先介绍了喷射泵的结构、原理、特点,其次论述了在加氢裂化装置的应用情况。 相似文献
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延安炼油厂分馏塔喷淋型湿式空冷器自2013年投用以来发生多次腐蚀泄露,通过对空冷管束腐蚀主要原因管内低温化学腐蚀、电化学腐蚀和循环冷却水腐蚀进行分析,并采取有针对性的预防措施,进而保证整个催化装置安全平稳运行。 相似文献
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文章主要介绍了中国石化镇海炼化分公司PX装置抽余液塔顶气低温热回收利用的工程实例。通过新增热水循环系统,将塔顶低温热取走,供给乙烯裂解装置使用,减少空冷的电耗同时达到装置挖潜增效的效果。 相似文献
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某化工厂在运加氢换热器管束出现泄漏,检查发现多根不锈钢管束腐蚀穿孔、断裂,对换热器材质、管束泄漏样管宏貌和微貌进行分析,结合运行条件等综合判断,泄漏为CL-在凝结水气环境下,对管束造成的异常腐蚀所致。腐蚀的主因是换热器布置和工艺条件出现较大变化,文章最后结合实际情况,提出了应对措施。 相似文献
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针对原有管束使用周期短、腐蚀现象严重的情况进行了综合分析,将原管束材质由10号碳钢更换为抗湿硫化氢应力腐蚀效果明显的08Cr2AlMo材质。在随后的设备运行周期内延长了管束的使用期限,降低了修理费用,具有良好的社会效益和经济效益。 相似文献
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Jebel Dhana, from the Abu Dhabi Water and Electricity Authority (ADWEA), operates two 2 MGD multi-effect thermo-compression distillers commissioned in 1996. Tube failures were first reported approximately 16 months after commissioning. The initial tube failures were from the upper rows, but more recent failures were apparently randomly distributed throughout the tube bundle. Ten tubes were removed and their corrosion morphology was examined macroscopically and microscopically. The corrosion products were analysed by X-ray, EDAX, and EPMA techniques. The copper nickel alloy tubes were found to have suffered from vapour side corrosion; however, there was no sign of any copper oxide deposition, as has often been seen in failed tubes from MSF distillers. The failures took two forms: corrosion fatigue cracking, and pitting corrosion. The corrosion fatigue was in the form of a circumferential crack at a flat portion of the tube in the centre of a tube span. It was believed that the flat surface had developed as a result of fretting against a neighbouring tube, and had been worn away to the point of failure. Unfortunately, the position of the tubes in the tube bundle had not been identified during their removal, but it is suspected that the damaged tube had been in the top row, with the flattened portion directly below one of the two vapour inlet pipes. The other tubes sampled showed pitting corrosion. Some of the pitting had perforated the tube walls whilst others showed pitting on the outer surface only. Some of the pits contained corrosion products whilst others were free of them. This pitting corrosion is attributed to the formation of carbonic acid in the presence of oxygen (air). A weak acid is formed due to the dissolution of CO2 in the condensing water vapour. The gas concentration varies within the tube bundle, due to the vapour phase, allowing the gas concentration to increase in specific areas of the tube bundle, causing the non-uniformity of attack. There was no immediate tie-up between the pitting corrosion and the two steam inlet pipes due to the unknown position of the sampled tubes within the tube bundle. It is recommended that the oxygen level be reduced by ensuring that the distiller vessels are as air-tight as possible, thus reducing the tendency towards pitting corrosion. 相似文献
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核电站在运行时,腐蚀产物和杂质会从二回路迁移到蒸汽发生器中,这些物质中有很大一部分将残留在蒸汽发生器内,成为泥渣和污垢,并逐渐在管板和支撑板上部、管子表面、支撑板与管子的缝隙内沉积。如果这些泥渣与污垢未被清除,将越积越厚,越来越硬,不易渗透,会使蒸汽发生器降质并影响其性能。文章介绍了泥渣与污垢的形成及其危害,泥渣与污垢中的物理化学过程、管板与管束的清洗方法、泥渣与污垢的数量及其清洗。 相似文献
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介绍低温甲醇洗系统中氨的来源,探讨氨对低温甲醇洗系统的影响。氨虽然能够抑制系统的腐蚀,但氨会在激冷器管束中生成铵盐堵塞换热器管束,氨也会使合成气中硫超标。针对影响因素,提出控制低温甲醇洗系统中氨的方法。 相似文献
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随着广州石化进口高硫原油量的日益增加,作为处理高硫原油的加氢处理装置的设备腐蚀也大幅度增加。为了减缓加氢处理装置的高压空冷的结垢和腐蚀,确保装置长周期安全运行,在高压空冷系统进行YS-SR1275高压空冷阻琚缓蚀剂的工业应用试验。试用结果表明,YS—SR1275对高压空冷有较好的阻垢缓蚀作用。 相似文献