共查询到19条相似文献,搜索用时 578 毫秒
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随着环保问题越来越得到重视,无化学药剂添加的阻垢方法也愈加引起研究者的关注。磁处理被一些研究者认为是一种无污染、低成本的物理防垢方法,但其在工业应用中的有效性和作用机制仍存在很大争议。以碳酸钙结晶体系为研究对象,新设计了磁场作用范围宽窄两种形式的磁处理装置,着重考察了与工业应用密切相关的处理水量与磁处理效果间的耦合关系。结果表明,当处理水量较小时,磁处理可促进碳酸钙的均相成核,使生成的晶体粒径变小数量增多,总沉积量增大,并且磁处理效果在一定转速范围内随旋转磁场转速的增加而增强。此外发现,旋转磁场与水量有明显的耦合关系:当磁处理条件不变而处理水量增大时,磁处理效果就会减弱;当处理水量一定而强化磁处理条件时,磁处理效果就会增强。先磁处理一部分溶液再逐步添加溶液进行的分步磁处理实验表明,该法可提高大水量条件下碳酸钙的去除率,使磁处理效果更为明显,同时表明了处理水量与磁场相匹配耦合的重要性。 相似文献
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随着环保问题越来越得到重视,无化学药剂添加的阻垢方法也愈加引起研究者的关注。磁处理被一些研究者认为是一种无污染、低成本的物理防垢方法,但其在工业应用中的有效性和作用机制仍存在很大争议。以碳酸钙结晶体系为研究对象,新设计了磁场作用范围宽窄两种形式的磁处理装置,着重考察了与工业应用密切相关的处理水量与磁处理效果间的耦合关系。结果表明,当处理水量较小时,磁处理可促进碳酸钙的均相成核,使生成的晶体粒径变小数量增多,总沉积量增大,并且磁处理效果在一定转速范围内随旋转磁场转速的增加而增强。此外发现,旋转磁场与水量有明显的耦合关系:当磁处理条件不变而处理水量增大时,磁处理效果就会减弱;当处理水量一定而强化磁处理条件时,磁处理效果就会增强。先磁处理一部分溶液再逐步添加溶液进行的分步磁处理实验表明,该法可提高大水量条件下碳酸钙的去除率,使磁处理效果更为明显,同时表明了处理水量与磁场相匹配耦合的重要性。 相似文献
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磁场处理水的阻垢研究 总被引:20,自引:2,他引:18
本文研究了磁场处理对CaCO3阻垢效果的影响因素,表明,随着硬度和碱度的升高,阻垢率下降,对给定的磁处理器,存在着最佳流速。当PH〉8.5时,阻垢率迅速下降。 相似文献
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A. Khalil R. Rosset C. Gabrielli M. Keddam H. Perrot 《Journal of Applied Electrochemistry》1999,29(3):339-346
The efficiency of physical antiscale treatments of water was evaluated by various techniques, such as chronoamperometry, electrochemical impedance and chronoelectrogravimetry. It was found that the antiscale electrolytic treatment is more efficient than magnetic treatment, at least for the commercial devices used here, and that it also has a longer lasting effect. The electrolytic process generates CaCO3 nuclei in suspension in the bulk water, which provokes homogeneous scaling rather than heterogeneous scaling on the walls which is to be avoided. If the small crystals generated in the bulk are eliminated by filtration, surface scaling is again observed. 相似文献
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在大庆油田三元复合驱采油工艺中,采出液引起管柱结垢,严重影响了油田的正常生产。通过对垢质腐蚀产物检测分析,探讨油田井下管柱表面结垢原因,结合防腐涂料的新技术发展,筛选出适应井下工矿条件的钛聚合物树脂防垢防腐涂料。并开发了与之配套的环保高固体份涂料自动化涂装工艺生产线,获得具有良好防垢防腐效果的涂层油管。该功能型防垢涂层油管在几个三元驱区块开展现场试验,减缓管柱的结垢,管柱清垢周期延长,井下作业次数减少。 相似文献
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Leshu Yu Lei Liang Shengwei LiuYingying Lv Jianzhen LinHuiQuan Li 《Chemical Engineering Research and Design》2011,89(7):1056-1060
It is more reasonable to evaluate scale inhibitors from examining the scale deposited on the surface of heat exchanger tubes than from testing the bulk precipitations in industrial circulating cooling water. In this contribution, a facile cathodal polarization plus weighing has been put forward for fast assessing the common scale inhibitors. Through the short-time cathodal polarization and followed weighing of the mass of scale, the antiscale efficiencies of scale inhibitors were obtained quickly, typically with the order of antiscale efficiencies being PBTCA ≈ HEDP ? PAA. Since the tested scale was the one deposited on working electrodes made of heat exchanger tubes, the new method in this study could reflect actually the antiscale performance of the used scale inhibitors. Therefore the simple operation and reasonable evaluation would endow this route the wide applications in quickly selecting the right scale inhibitors for the water consumers. 相似文献
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介绍了105 m3聚合釜PVC生产工艺流程,通过改进引发剂体系缩短反应时间,采取多种措施缩短辅助时间,解决粘釜问题,使PVC装置生产能力由8万t/a提高到11万t/a. 相似文献
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新型复合有机防垢剂的合成与防垢效果的研究 总被引:1,自引:0,他引:1
本文合成了新型复合有机防垢剂乙二胺四甲撑膦酸(EDTMP)及聚丙烯酸钠,在硬水中对它们单独与复合使用的防垢效果进行研究,并探讨了防垢机理,为工业锅炉用水提供一种新型有效的防垢剂。 相似文献
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The effect of magnetic fields on molecular configuration of liquid crystalline polymers under shear flows are numerically analyzed using the extended Doi theory in which a molecular shape parameter is admitted. The evolution equation for the probability density function of the LCP molecules is directly solved without any closure approximations. One case is considered that the magnetic field makes 45° with respect to the flow direction. We can find that the magnetic fields strongly affect on the transition among flow‐orientation modes, such as tumbling, wagging, and aligning modes. And a new aligning flow‐orientation mode emerges at low shear rate, which is macroscopically same as the ordinary aligning mode, but is microscopically quite different from the ordinary one. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 相似文献
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采用磁控溅射法先在Si(100)基片上沉积适当厚度的Fe薄膜作为底层,通过对Fe底层厚度及氧气流量的控制,使底层Fe形成化学计量的无缓冲层的Fe3O4多晶薄膜。通过X射线衍射和磁强计分析了样品的结构和磁性能。结果表明:当初始氧气流量为1.5mL/s时,在15nm的Fe薄膜底层上可成功制备高晶粒织构的化学计量的Fe3O4薄膜。将Fe3O4薄膜应用到巨磁电阻(giant magnetoresistance,GMR)多层膜中,由于多层膜材料间电阻率的失配,利用Fe3O4半金属薄膜并不能获得预见的大GMR效应。 相似文献