共查询到20条相似文献,搜索用时 406 毫秒
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对20万t PET装置的真空系统经常出现的故障进行分析,通过增加缩聚真空管线电伴热,刮板冷凝器改造、大气腿反吹、真空喷淋管线改造等真空系统的技术改进,延长真空系统运行时间,为装置长周期平稳运行提供保障。 相似文献
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通过分析比较不同PET工艺装置的EG真空喷淋冷凝器,结合不同类型冷凝器的优缺点,对PET生产线的该冷凝器进行优化设计,并在工程实践中获得了成功的应用。新型冷凝器对其结构进行了改进,使得喷淋效果更佳,可简单实现在线拆换喷嘴进行清洗,使其结垢、缩径和堵塞等问题有了明显的改善。 相似文献
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在聚酯装置真空系统中采用刮板冷凝器,可以消除低聚物堵塞的弊端,提高生产率。文中主要对刮板冷凝器的整体结构、大开孔计算、弹性支座、轴封系统、轴承等的机械设计进行分析讨论,提出了一些看法 相似文献
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结合生产实践,对PET装置终聚釜喷淋冷凝器大气腿堵塞的原因进行了剖析,包括落入大气腿的积聚物块过大,终聚釜液位过高,真空度过高和搅拌转速过快,反应温度过高等。找到了预防和处理终聚釜喷淋冷凝器大气腿堵塞的措施。 相似文献
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叙述了真空冷凝器(主要是管壳式真空冷凝器)的型式和特点,真空系统内设备间的相互作用,并特别指出了在设计优化和安装时应注意的事项。 相似文献
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Ki-Young Dong Yang Doo Lee Byung Hyun Kang Jinnil Choi Byeong-Kwon Ju 《Nanoscale research letters》2013,8(1):143
The variation of vacuum level inside a field emission device when electron is emitted from multi-walled carbon nanotubes (MWCNTs) by electric field was measured where MWCNT gauge packaged with a vacuum device was used to measure the degree of a vacuum until the end of the vacuum device life. It was found that the electrical properties of MWCNTs altered with the degree of a vacuum. We fabricated MWCNT gauge which were printed and pasted by the screen printer. In this paper, we report the successful detection of the ionization of gases in vacuum state. 相似文献
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介绍闪蒸气变压吸附装置投用后,尝试采用开停真空泵、调整真空度的办法,控制产品气中CO2含量的情况。 相似文献
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Michael J. Haas Meredith R. Barr John Phillips Karen M. Wagner 《Journal of the American Oil Chemists' Society》2015,92(9):1357-1363
Commercially available refined vegetable oils were investigated as calibration standards for the filtration device and protocol specified by ASTM D7501 for conducting the biodiesel cold soak filtration test. Filtration time was determined to be a function of the amount of vacuum applied during filtration, with an 8 % change in the filtration time of soybean oil occurring across the vacuum range specified by ASTM D7501. At a constant vacuum of 57 cm Hg the mean filtration time of 150 mL of soybean oil was independent of operator, device, and oil lot number. Mean filtration time was also largely independent of brand: the average of the mean filtration times of replicate samples of seven brands of soybean oil was 396 s with a minimum significant difference (MSD) of 28 s, and the filtration times of seven of eight brands of soybean oil tested fell within this MSD. Refined edible‐grade corn, canola, peanut, safflower and sunflower oils gave reliable filtration times and would be suitable standards. Each oil exhibited a characteristic filtration time, all greater than that for soy oil. Filtration times were an approximately linear function of kinematic viscosities, as predicted by Darcy's Law. Edible vegetable oils can serve as reliable, affordable, consistent and generally available materials for confirming the operability of the filtration device used in the biodiesel cold soak filtration test. 相似文献
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在常减压装置中,高温油气管线的减薄对装置的安全运行是一个很大的危险。某常减压装置的使用温度为200~370℃的过汽化油管线发生泄漏,经过现场使用高温超声测厚仪和脉冲涡流对这部分相同工况条件下的管线进行测厚,发现这批管线的最大腐蚀速率3 mm/年。并且在对两种测厚方法得到的测厚值进行了对比。按照GB19624-2004附录H的技术要求对这批管线进行安全评定,得出剩余寿命,为装置管理人员提供了技术支持。 相似文献
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液环泵机组在石化蒸馏过程中主要作为真空蒸馏的真空获得设备。具有热敏性介质的各蒸馏塔必须采用低压、常压及真空蒸馏,常压及真空蒸馏产生的排放气,采用吸收—液环泵增压—火炬燃烧,不但可以满足国家及行业的安全、环保、职业卫生的规定,而且吸收塔、液环泵可以就近布置在装置内,又具有设备投资省、管理费用小、不增加定员的特点。几个月的运行结果表明吸收—液环泵增压—火炬燃烧技术解决了热敏物料分离上存在的排放气难以处理的问题,值得在类似装置上推广应用。 相似文献