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采用系列检测方法与储罐结构有限元评估相结合的方式对原油储罐的腐蚀情况和整体现状进行评估。评估结果表明:罐体外观、结构及几何尺寸满足安全使用的要求,罐体涂层、阴极保护系统对罐体保护作用良好,罐体内外结构无损探伤、硬度、厚度符合安全要求,总体认为原油储罐状况良好。 相似文献
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大型储罐壁板角变形、凹凸变形及其几何尺寸的控制是保证储罐罐体施工质量的关键环节,因此需要从管理、技术、施工三方面着手,强调"预制质量是前提,合理的施工工艺是保证,施工过程控制是手段"的主导思想,提高储罐的施工质量。 相似文献
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根据大型原油储罐的焊接施工及无损检测经验,结合中海油惠州1200万t/a炼油项目原油库区8个10万m3原油储罐的施工,对罐体制作焊接施工中容易出现的主要缺陷的分布和成因进行了研究,提出了避免缺陷产生的方法,并介绍了缺陷返修过程中的注意事项。 相似文献
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在搪瓷拼装储罐的实际工程建造中,由于国内缺少针对搪瓷拼装罐体外压结构设计的相关标准,在某些场合设计中存在缺陷,造成罐体失效案例的发生。因此,借助数值模拟方法,研究搪瓷拼装罐体与无缺陷钢罐的外压等效关系,基于等效关系探究不同外压工况下罐体的屈曲变形和罐体变形规律。仿真结果表明:在各种罐体承外压工况下,空罐状态承受外压时,罐体易出现外压失稳现象。而合理的钢板厚度设计、抗风圈设计能够有效提高罐体的抗变形性能。借助仿真分析结果对整体罐外压公式进行修正,得到搪瓷拼装罐外压设计方法,可为大型搪瓷拼装罐体外压结构设计提供参考,保证搪瓷拼装罐体的安全可靠。 相似文献
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大型储罐施工中的主要技术问题之一是控制罐底板的焊接变形.在锦州石化公司10万m3原油储罐的施工中,采用CO2气体保护电弧焊打底、碎丝埋弧焊填充盖面的焊接工艺,既能有效防止焊接变形,又能提高劳动生产率. 相似文献
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大部分施工单位组装焊接时是将煨制出厂的角钢,用储罐的曲率样板进行检修去头后就单根组焊于罐壁.借用外力及杆件顶拉方法控制罐体椭圆度,罐顶板边缘和包边角钢均产生较大的焊接变形和残余应力.根据我单位制作球罐的经验,总结出包边角钢组装焊接后结构变形量小和存在内应力最少的工艺方法及防止组装焊接变形的措施. 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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The miscibility of various amorphous polybutadienes with mixed microstructures of 1,4 addition units (cis, 1,4 and trans 1,4) and 1,2 addition units have been investigated. The studies here involved optical transparency, differential scanning calorimetry, and small angle light scattering. It was found that a 90 percent (cis) 1, 4 addition polybutadiene was immiscible with high (91 percent) 1,2 addition polybutadiene. Reduction of the 1,2 content to 71 percent induced an upper critical solution temperature (UCST) with the cis 1,4 polymer. Polybutadienes with 50 percent and 10 percent 1,2 contents were miscible above the crystalline melting temperature of the cis 1,4 polybutadiene. Immiscibility of the 91 percent 1,2 addition polymer was also found with a 10 percent 1,2 polybutadiene. The latter polymer also exhibits an UCST with the 71 percent 1,2 polymer. The results are used to interpret the characteristics of blends of polybutadienes of varying microstructure. 相似文献
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以F类粉煤灰为例,详细介绍了测定粉煤灰中烧失量的步骤、计算数学模型、影响测量不确定度的因素以及各项测量不确定度分量评定,人员、设备、材料、方法、环境都是影响测量不确定的因素。 相似文献
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我厂3号回转窑(Φ4m×60m)生产线在1996年年底由SP窑(产量912t/d)改为NSP窑(产量1320t/d),预分解系统为四级旋风预热器带离线式分解炉 相似文献
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The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 相似文献