共查询到16条相似文献,搜索用时 109 毫秒
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通过对加热炉流管失效部件的宏观和金相检查分析,充分证明该部分炉管的失效是由于在严得超温下工作所引起的,提出了引起对流管超温的可能原因和解决炉管超温的应对措施。 相似文献
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应用扫描电子显微镜、能谱分析以及X射线衍射仪对焦化加热炉辐射炉管的高温腐蚀产物外貌特征,腐蚀物成分以及物相进行了分析,结果表明,由于炉膛操作温度过高,且燃料中含硫,Cr5Mo炉管不但发生高温氧化腐蚀,还发生高温硫腐蚀,使加热炉辐射炉管破坏加巨,最终导致炉管失效,同时提出了预防措施。 相似文献
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A numerical model was developed to investigate dynamic instability in fossil fired once through boilers and the influence of the dynamics of tube and membrane structure furnace wall tubes on the stability boundary was examined. In order to predict density wave oscillation (DWO), the most common type of dynamic instability, a time domain nonlinear analysis approach was used to give a transient flow field in the tubes. The tubes were divided into one-dimensional finite volumes along their lengths and equations of conservation of mass, momentum and energy were discretized to give algebraic equations. The SIMPLE algorithm was adopted to solve these equations. Analysis of two-dimensional transient conduction across a tube-membrane section of each volume was performed concurrently and the resulting heat transfer between tube inner wall and fluid was included in the source term of the energy equation. After verification with results in available literature, the model was applied to a wall tube section of a 700 MW boiler furnace in subcritical once-through condition. The stability boundaries for three types of tube configuration were predicted, and it was found that the dynamics of tube configuration can have a significant effect on the flow instability in the boiler furnace wall tubes. 相似文献
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总结了两年多来中国石化炉管质量检测检验与评估中心对乙烯裂解炉管抽样检测的状况。对国产乙烯裂解炉141根离心铸造炉管、24根炉管焊接件以及27根静态铸造管件开展了化学成分、室温拉伸性能、高温持久性能试验和低倍组织酸蚀试验,给出了当前国产离心铸造炉管行业对杂质元素含量的控制情况、国产离心铸造炉管和静态铸造管件的室温拉伸性能与高温持久寿命状况,以及柱状晶与等轴晶比例。结果表明,当前国产乙烯裂解炉管合格率在80%~90%左右,炉管焊接件和静态铸造管件的高温持久寿命基本不合格,凸显出了国产乙烯裂解炉管行业存在的严峻问题。还就离心铸造炉管和管件杂质元素、新制造炉管性能与服役炉管失效模式的关系等问题开展了讨论。 相似文献
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对某炼厂焦化炉管运行时间仅1年多造成失效的材料进行了全面的理化性能试验研究,分析炉管早期失效的根本原因,为以后该焦化炉的安全经济运行和操作、检修工作提供指导。 相似文献
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采用煤中硫分析仪对原油中的总硫含量进行了测定。但实验发现,当连续进行十次以上进样测定后,石英管出口、过滤器及电解池由于原油样品的不完全燃烧而变黑污染,从而造成测试结果偏低。笔者对仪器的燃烧炉及石英管结构进行了改进,并对实验时的操作参数如炉温、反应时间、取样量、样品覆盖度等进行了优化改进。实验结果表明,改进后的仪器用于原油中总硫含量的检测,连续测试30次,整个仪器系统无变黑污染现象发生,且准确度和重复性均较好,完全符合相关原油总硫含量检测要求。 相似文献