共查询到19条相似文献,搜索用时 453 毫秒
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我厂甲醇装置主精馏塔由前苏联引进。自1 992年 6月投运以来 ,设备始终在满负荷下运行。 1 999年 6月发现精馏塔裙座上方 2 .7米处筒体进料管 (亦即两台再沸器出料管 )侧壁位置发生气孔泄漏 ,我们采用塔外筒体贴补方法加以修复。但修复后该塔运行了仅两个月 ,又在该处其它部位发生两次穿孔泄漏。这表明该塔局部部位的腐蚀已很严重。如果更换一台进口设备 ,包括拆吊、安装等需 30 0万元 ,耗资大 ,且周期长。我们对主精馏塔 (以下简称精馏塔 )的具体工作情况进行了分析 ,并查阅了有关资料 ,根据资料分析 ,认为精馏塔设计寿命 1 5年 ,而目前仅… 相似文献
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为算出一座焦炭塔堵焦阀接管处的管端推力(矩)数值及塔体接管部位的应力,特选用等值刚度法FAOP及有限元法MSC两个标准程序分别对该塔的高温进油管系及塔体接管部位进行了柔性分析及应力计算。为了验证计算方法的正确性,还在接管部位用电测法进行了高温应力测定试验。结果证明两者数值吻合 相似文献
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本文简述了精苯乙烯塔的工艺流程,分析了某公司苯乙烯装置精馏塔塔底虹吸式再沸器在生产过程中相同操作参数条件下的泄漏情况,通过对该换热器制造过程中存在问题的处理,得出泄漏的主要原因是上管箱型体的改变使得气相流急剧变向引起冲刷腐蚀,部分换热管过胀造成管壁减薄是再沸器泄漏的重要原因。 相似文献
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本文对上海石化二厂的OOGr20Ni25Mo4.5Cu钢制的甲乙混酸塔严重腐蚀情况的检测基础上就其腐蚀的原因进行了讨论与分析。 相似文献
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Coal liquids distillation tower corrosion: chloride analysis of solvent refined coal process samples
Burtron H. Davis Gerald A. Thomas Alberto A. Sagüés Carlton H. Jewitt Kenneth L. Baumert 《Fuel Processing Technology》1983,8(1):77-93
Severe chloride corrosion incidents have occurred in the distillation area of major direct coal liquefaction plants. Chloride analyses have been carried out for samples collected at various process streams of one of these plants (the Wilsonville, Alabama SRC-1 pilot plant) in order to define the pathway of corrosive species to the distillation area. These analyses show that the major fraction of the chloride in the atmospheric distillation tower is carried there in the higher-boiling process streams. The chloride level at a particular point in the atmospheric distillation tower may be several times that of the tower feed liquid; this concentration contributes to the catastrophic corrosion experienced in these towers. This chloride concentration provides an explanation for the occurrence of the corrosion in the last distillation tower in the process stream, rather than in the tower(s) first contacted by the chloride containing distillate stream. It also accounts for the observed localization of the corrosion within narrow regions of the atmospheric distillation tower. The chloride concentration and the chloride pathway are factors which designers of coal liquefaction distillation processes need to consider in a design that will keep corrosion to a manageable level. 相似文献
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采用离散相模型对新OG系统高效喷淋塔入口段及主体段喷嘴的布置方式进行数值模拟,考察了喷嘴喷射方向和喷淋层数对雾化场气流分布和降温效果的影响。结果表明,喷嘴的喷射方向和塔内的喷淋层数对雾化场的气流分布和降温效果影响较大;喷淋塔入口段采用逆流喷射时,出口截面的速度分布最均匀且降温效果最好;高效喷淋塔的主体段的喷淋层数为5时,塔内烟气的速度流场较均匀,且中心区域的气流速度为2~4 m/s,有助于延长气体与液滴的作用时间;随喷淋层数增加,塔内温度梯度变化增大,水蒸气质量分数分布与温度分布对应,塔内的平均湍动能逐渐增高。 相似文献
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Burtron H. Davis Karen Cisler Alberto A. Sagües Kenneth L. Baumert 《Fuel Processing Technology》1984,8(2):195-203
Iron analysis of SRC-I process samples clearly identify where severe corrosion occurs in the fractionation area. The data show that nearly all of the chloride entering the atmospheric fractionation tower is in a corrosive form which is converted to a product in this tower. The plant data, together with laboratory corrosion studies, indicate that in this tower corrosion is a chemical reaction rather than a chloride catalyzed reaction. The data are consistent with a chemical reaction with a stoichiometry required for the formation of approximately FeCl2. 相似文献
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常顶系统流动腐蚀机理预测及防控措施优化 总被引:1,自引:0,他引:1
国内某炼油厂常减压蒸馏装置的常压塔顶冷却系统换热器频繁出现腐蚀失效问题。基于物料衡算原理,采用逆向推导的方法及工艺过程模拟计算分析了该常压塔顶冷却系统的流动腐蚀失效机理,包括露点腐蚀、铵盐结晶沉积垢下腐蚀以及多相流冲刷腐蚀。注水是一种方便且非常有效的破除露点腐蚀和铵盐结晶沉积垢下腐蚀的工艺防护措施。但由于该炼油厂常压塔顶注水量有限,每台换热器采用不同的注水方式,依然出现了流动腐蚀失效问题。通过模拟计算,提出根据不同的注水量应选择不同的注水方式(总管注水、换热器定点注水和程控注水),从而实现该常顶冷却系统长周期稳定运行。 相似文献
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Burtron H. Davis Alberto A. Sagues Gerald Thomas Kenneth L. Baumert 《Fuel Processing Technology》1985,11(2):183-203
The pilot plant was operated during a three-week period with a coal containing about 0.25 wt.% chloride. During this period, samples were collected at about 20 sample points throughout the process. The mass balance and chloride content of these samples provided data to define the chloride pathway to the atmospheric distillation tower where it subsequently caused severe corrosion problems. A fortuitous processing change, made about half-way through the period, provided a marker that helped define the chloride pathway through the process. About 10% of the chloride entering the dissolver flashed overhead in the high pressure separator; this fraction remained constant even thought the total chloride entering this separator area changed by a factor of 5 to 10. In the Wilsonville plant about 50% of the total chloride entering the reactor was carried to the atmospheric tower in the highest boiling distillate process stream. Essentially all of the chloride entering the atmospheric tower was converted to iron chloride by corrosion of a lower portion of the tower. 相似文献
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本文对CO2吸收塔的钒化机理进行了论述,结合其内部腐蚀形貌对CO2吸收塔进行腐蚀分析,明确了腐蚀产生的原因,并对以后在生产中设备的正常运行提出了建议. 相似文献
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分析了D402冷却塔填料及内壁腐蚀,得出了电偶腐蚀是主因。设备更新时塔体材料采用16MnR 0Cr18Ni10Ti复合板,投用后设备腐蚀甚微,证明选材是可行的。 相似文献
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浅谈焦碳塔的热应力分析及初步改造措施 总被引:1,自引:0,他引:1
根据焦碳塔的操作工艺及塔壁的径向温差,计算出由其产生的最大热应力,然后对筒体与裙座焊缝区域的变形及其约束情况进行了分析,并提出了初步的改造措施。 相似文献