共查询到20条相似文献,搜索用时 93 毫秒
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介绍了一效蒸发器的主要制作工艺,将设备的整体热处理改为局部热处理和胀紧率的确定,为强度胀接大口径管子积累了经验。 相似文献
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碳化塔制作过程中容易出现水箱接管纵焊缝棱角超标、筒体与水箱接管焊接接头处产生裂纹、水箱铝管胀接不牢固等问题。通过对其产生的质量问题进行分析,提出用模具调整纵焊缝棱角、重开坡口并规定焊接顺序防止焊接裂纹、改变制作工艺解决铝管胀接不牢固等措施,在生产中取得了满意的效果。 相似文献
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1 前言转化器是在电石法生产聚氯乙烯过程中,氯乙烯单体合成的关键设备。它使用情况的好坏,直接影响到聚氯乙烯的稳定生产。目前,我国在转化器的设计制作中,对换热管与管板的密封形式主要采用胀接、焊接和焊接加胀接等三种形式。第一种形式由于制作维 相似文献
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通过对热交换器管板胀接基础试验、模拟产品胀接试验及产品的胀接,提供了产品胀接方法与控制措施,为胀接工艺编制提供技术支持。 相似文献
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文章介绍了换热管与管板的胀接,其中机械胀接由于优点多,操作简单,因此应用广泛。为了检查胀管的质量、管材的胀接性能,确定最佳的胀度,检验胀接部位的外观质量及接头的密封性能,测试胀接接头的抗拉脱力,在正式胀接前应进行试胀,通过试胀,检验合格,选定最佳胀度,待正式胀接时采用。 相似文献
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新型缓蚀阻垢剂的开发 总被引:1,自引:1,他引:0
聚环氧琥珀酸(PESA)是新一代可生物降解的绿色阻垢剂.研制了一种以PESA为主要成分的缓蚀阻垢剂.通过旋转挂片法和碳酸钙沉积法对水处理剂复合配方进行了筛选,找到缓蚀阻垢剂最佳配方,并验证得知不同浓缩倍数下该水处理剂的缓蚀阻垢性能都较好. 相似文献
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In bench-scale tests of seawater reverse osmosis desalination it is important to carefully consider osmotic pressure effects and determine the extent of concentration polarization so that sources of flux variation—whether from fouling, compaction, or osmotic pressure changes—can be properly assessed. Rigorous modeling of concentration polarization is difficult because of the complex geometries and flow regimes in RO modules; typically, concentration polarization must be measured. However, concentration polarization measurement usually requires knowledge of membrane permeability, which can vary from coupon to coupon. In this study a method is presented to determine both the membrane permeability and the concentration polarization regime in a single test. The key to the test is to allow the salt concentration to vary over time in a predictable way and extract parameters from a model fitted to the flux data. The usefulness of this technique is highlighted by evaluating results from several seawater experiments. It was found that specific flux decline in the experiments was caused by changes in osmotic pressure and membrane compaction. RO fouling by seawater organic-matter was not significant for the several seawater samples tested. 相似文献
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王珍 《陶瓷研究与职业教育》1994,(1)
针对目前日用瓷吸水率的测定方法,论述了引起测试误差的原因并提出了减小方法误差和偶然误差的方法。这种新方法要求制作试块,以石蜡填充开口气孔,借助密度计(精度0.001cm3)测试体积密度、表观密度和真密度.用单位面积吸水质量或气孔率(真气孔率)表示陶瓷制品的瓷化程度。 相似文献
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植酸的缓蚀阻垢性能的研究 总被引:1,自引:0,他引:1
植酸是从粮食作物中提取的有机磷酸化合物,它是天然的无毒化工产品。通过鼓泡法和旋转腐蚀挂片失重法对其阻垢性能和缓蚀性能进行了评价。结果表明植酸具有一定的缓蚀性能和阻垢性能,其阻垢性能虽比常用的药剂PBTCA、HEDP、HPMA稍差,但可通过同其他的药剂复配生成低磷或无磷的阻垢剂,是较有发展前景的绿色缓蚀阻垢产品。 相似文献
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《Journal of the European Ceramic Society》2017,37(4):1291-1303
For use of short fiber reinforced ceramics the knowledge of the influence of coupon geometry on the failure mode and the determined resistance in bending tests is necessary. In contrast to the continuous fiber reinforced ceramic matrix composites (CMC), for short fiber reinforced CMC there are only few studies and no standard on consideration of size effects. In the present work, the influence of coupon geometry and test conditions on the average value and distribution of flexural strength has been investigated. Two short fiber CMCs with different fiber length were examined under four point bending load. Moreover, the relationship between fiber orientation in the loaded area, failure location and measured flexural strength was investigated through high resolution X-ray computer tomography (μCT) and SEM. The presented outputs will be proposed to a future standard for bending test of short fiber reinforced CMC materials with different fiber length. 相似文献
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Yong Xia Qing Zhou P.C. Wang N.L. Johnson X.Q. Gayden J.D. Fickes 《International Journal of Adhesion and Adhesives》2009,29(4):427-433
By conducting impact tests on three different types of coupon joints, it is observed that the adhesive-bond and the spot-weld in the weld-bonded joints behave and fail with little coupling, but supplement each other, which is very similar to the static test situation. The loading rate sensitivity of all three joint types is clearly demonstrated by comparing the peak loads between static and dynamic coupon tests. Incorporating the strain-rate effect of the base steel sheet into modeling of weld-bonded structures is proved to be necessary by comparison of the peak loads between tests and simulations. More effort is needed to characterize the rate dependence of the failure behavior of the epoxy adhesive. 相似文献