共查询到18条相似文献,搜索用时 93 毫秒
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本文论证了通过使用静电对烟尘荷电,能改善布袋收尘器性能。荷电是在收尘之前或收尘过程中进行的,它能减少布袋收尘系统的比阻率。本文介绍了应用静电预荷电技术的某些冶金工厂,该技术能增加铅冶炼厂大型振打式布袋收尘器的处理能力。在澳大利亚昆士兰州芒特艾萨,芒特艾萨矿业公司(MIM)的铅冶炼厂得到应用。 相似文献
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采用气流粉碎与静电分散复合法(气流粉碎/静电分散)制备得到的超微粉体具有较好的分散性,然而粉体颗粒所带电量在空气中会逐渐发生消散流失,导致分散效果逐渐减弱甚至消失。本文以CaCO_3粉体和钡铁氧体粉体为研究对象,设计了一种新型非接触测量方案来实现荷电粒子电量衰减特性的连续测量,对两种荷电粉体颗粒在空气中的失电过程进行了实验研究。结果表明,荷电粉体颗粒荷质比在空气中的消散呈指数关系衰减;原始荷电电压越高,荷质比的初始衰减速率越大,且在整个衰减过程中相同静置时间下的荷质比数值亦越大;此外,粉体颗粒对所荷电量的贮存能力与颗粒粒径及其相对介电常数有关,颗粒粒径愈小,相对介电常数愈大,则其电荷贮存性能愈佳。 相似文献
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运用FLUENT对电袋除尘器电场区域内流场、电晕电场、荷电粒子运动轨迹进行数值模拟,确定静电区捕集粉尘的最小粒径,优化静电区集尘板的最佳开孔范围.首先数值模拟了电袋除尘器静电区的流场分布和电场分布,在此基础上,分别数值模拟了粒径为0.5、1.5和2.5μm的粒子在外加电压为45 k V的电场中的运动轨迹和速度分布,并进行了数值分析.模拟结果表明:在该除尘器结构及模拟条件下,除尘器静电区通道内最小捕集粒径为1.5μm;在静电区通道内集尘板X方向的最佳开孔范围是0.324~1.25 m.研究结果为电袋除尘器静电区内结构的设计和优化提供理论参考. 相似文献
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为使电场强度满足工况要求,粉尘荷电效果理想,本文在分析不同高压电源技术特性的基础上,设计了由四个电场组成的静电收尘设备,并根据高压电源的使用工况进行了优化设计,其中,第一个电场由高频高压脉冲电源供电,其余电场由适合高比电阻的恒流源供电。设备投运后,工作状况良好,证明本文的相关分析符合实际情况,设计满足使用要求。 相似文献
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矿井作业过程中产生的矿井粉尘危害性极大,干式电除尘技术适用于矿井作业环境,但是原有技术在应用过程中会出现反电晕、二次扬尘等问题,所以就干式电除尘技术在矿井粉尘控制中的应用展开研究,实现气体电离时时最适电压选择,分析了粉尘粒子荷电中荷电机理进而避免产生反电晕,解决了电极清灰中二次扬尘问题,并经过实验论证,改良后的干式电除尘器可以有效提高除尘效率。 相似文献
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L Gianfranchi M Brignole C Menozzi G Lolli N Bottoni 《Canadian Metallurgical Quarterly》1998,81(3):351-354
Control of the house dust mite allergen has received considerable attention owing to its importance in some allergic diseases. One aspect of dust mites and their allergen-carrying faecal particles that has not been reported on, which may have allergen control applications, is the electrostatic charge they carry in the natural environment. To promote tribo-electric charging, household dust containing dust mite allergen and live house dust mites are separately agitated while in contact with either polypropylene, nylon or earthed metal. The charged dust and mites are subsequently subjected to electrostatic separation and collection. Results for concentrations of the house dust mite allergen, Der p1, indicate that, when subjected to nylon, Der p1 carrier particles appear to be predominantly positively charged. Similarly, when subjected to polypropylene, Der p1 carrier particles also appear to be positively charged. Reduction of excess free charge by agitation against earthed metal does not appear to affect the observed charging characteristics, indicating that the positive charge may be bound or inherent in the Der p1 carrier particles. In contrast, house dust mites exposed to nylon appear to be generally charging negative, whereas mites exposed to polypropylene appear to be charging positive. The observed electrostatic characteristics of the mites and Der p1 carrying particles will be useful in the future development of electrostatic allergen control methods. 相似文献
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Magnetic separation technology was applied to remove dispersants and crude oil from water with magnetite and maghemite. Maghemite exhibited rather constant removal efficiency for dispersants regardless of surfactant types, while magnetite exhibited higher removal efficiency for anionic surfactant, and the efficiency was higher in deionized water than in salty water that contains more ions. Sorption of the dispersants to magnetite can be explained with electrostatic attraction, while binding of the dispersants to maghemite can be described with electrostatic attraction as well as with the structural characteristics that provide high sorption capacity. The result from a water bath experiment, which was to test the collection efficiency of magnetic particles from water, indicated that the recovery efficiency of magnetic particles was nearly 100% after the dispersants had been sorbed. More than 80% of the oil was collected when the magnetite-to-oil ratio was more than 0.89, while the same percentage of oil was harvested when the maghemite-to-oil ratio was more than 0.46 in the oil removal experiment. Sorption of crude oil to magnetic particles can be explained with the fine particle–oil flocculation, which is associated with an electrostatic attraction between the magnetic particles with charged surface and polar compounds in the crude oil. 相似文献
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捣固炼焦技术的发展和应用 总被引:6,自引:0,他引:6
介绍了捣固炼焦的原理及技术优势,对顶装焦炉与捣固焦炉的主要特点进行了比较,分析了顶装炼焦改造为捣固炼焦所涉及的项目和可能遇到的问题,介绍了捣固炼焦技术的最新进展。 相似文献
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通过将翻车机的老式重压梁由线接触改为点接触的形式,以及对原有极限点、控制线路、凸轮控制器和液压油路系统改造,有效解决翻车机原有老式卸车机构积料致车皮回料、车皮利用率降低、成本增加的问题。 相似文献