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通过对裂解气压缩机EC-301三段出口换热器泄漏原因的分析,找到了引起泄漏的原因在于换热器管束的腐蚀。造成管束腐蚀原因是压缩机注水量过大及喷嘴雾化效果差,导致大量的水随裂解气进入段间换热器造成的冲刷、酸性腐蚀。通过降低注水量、更换喷嘴及加注中和缓释剂等措施,消除了腐蚀现象,延长了换热器的运行周期。 相似文献
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介绍了中国石化西安石化分公司300 kt/a石脑油加氢装置运行状况,针对反应器压力降升高、石脑油进料/反应产物换热器内漏导致精制油硫含量超标原因进行系统分析,通过检测、比较各换热器低硫端油样中的总硫含量判断换热器的内漏位置,指出原料油携带重质馏分油及腐蚀残渣是反应器压力降升高的重要因素,垢下腐蚀和H2S-HCl-H2O-NH3酸性腐蚀是换热器管束减薄甚至穿孔的主要原因。提出进料线设置过滤器、增设1台高温脱氯器、优化注水部位及注水量、石油脑油进料直供及材质合适材质等措施,以保证装置长周期运行。 相似文献
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针对焦化装置中段回流蒸汽发生器及蜡油蒸汽发生器管束多次失效进行分析,得出了应力腐蚀开裂、管束与管板连接缝隙和换热器操作条件波动大是管束失效的主要原因,进而从换热器管束和管板材料选择、设计制造及设备操作要求等方面提出了改进措施。 相似文献
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经换热管成分、材质和裂纹分析,3万t/a乙二醛氧化反应器换热列管损坏的根本原因是换热器较高的轴向热应力和液面腐蚀的交互作用。经重新设计并更换后,氧化器换热段径向温度分布均匀,解决了水蒸气冷凝的问题,达到了反应气激冷和能量回收利用的目的。 相似文献
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某项目投产运行大约18个月后,低压蒸汽过热器先后几次发生换热管开裂泄漏现象。将换热器解体后,通过对换热管取样进行化学成分分析、能谱分析、扫描电镜分析、金相组织分析,发现换热管发生泄漏的原因是由氯化物腐蚀引起的,提出了相应的预防措施,为低压蒸汽过热器长期运行提供借鉴。 相似文献
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钛材具有比强度高、耐腐蚀性强、换热效果好的特点,近年来被广泛用于氯碱行业、化工原料行业的压力容器制造。使用钛换热管的换热器比一般使用不锈钢换热管的换热器换热效果高十几倍,而且设备使用寿命长。介绍了钛管换热器的结构特点和主要技术参数、管程主要材料的选择及其制造要点。 相似文献
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Importance of crevices formed between tubes and tube plate for the operational behaviour of heat exchangers . It must be guaranteed by construction and manufacture of heat exchangers that primary and secondary medium are completely separated from each other. When this requirement is fullfilled, the operational use of heat exchangers can be impaired by corrosion reactions within the crevice formed between tube and tube plate which may result in corrosion damage. The various techniques which are in use to connect tubes and tube plate and which are described in the present report, must be valued with respect to the tightness of the connection as well as to the formation of crevices between tubes and tube plate. Corrosion resistant copperbase alloys and stainless steels are the most important materials which are in use for the construction of heat exchangers. The mechanisms of crevice corrosion with unalloyed and low alloy carbon steels, stainless steels, and mixed connections between tube and tube plate with these materials are described in detail. Crevice corrosion may be caused also by the formation of galvanic cells between materials of differing electrochemical response. Furthermore, the concentration of aggressive media in crevices between tubes and tube plate can lead to corrosion damage of heat exchanger tubes. For the service operation of heat exchangers without any hazard of corrosion damage in crevices between tubes and tube plate, such crevices must be avoided by proper construction and manufacture. As a model for suitable measures to avoid crevices, the manufacture of steam generators for PWR's is described. 相似文献
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Bubble/Slurry bubble column reactors(BCR/SBCR) are intensively used as multiphase reactors for a wide range of application in the chemical, biochemical and petrochemical industries. Most of these applications involve complicate gas–liquid/gas–liquid–solid flow behavior and exothermic process, thus it is necessary to equip the BCR/SBCR with heat exchanger tubes to remove the heat and govern the performance of the reactor. Amounts of experimental and numerical studies have been carried out to describe the phenomena taking place in BCR/SBCRs with heat exchanger tubes. Unfortunately, little effort has been put on reviewing the experiments and simulations for examining the effect of internals on the performance and hydrodynamics of BCR/SBCR. The objective of this work is to give a state-of-the-art review of the literature on the effects of heat exchanger tubes with different types and configurations on flow behavior and heat/mass transfer, then provide adequate information and scientific basis for the design and the development of heat exchanger tubes in BCR/SBCR, ultimately provide reasonable suggestions for better comprehend the performance of different heat exchanger tubes on hydrodynamics. 相似文献
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