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针对我国大气污染物的排放特点,袋式除尘是比较合适、运行稳定可靠的一项烟气除尘技术。介绍了过滤材料的分类,袋式除尘过滤材料的结构以及应用于高温腐蚀性烟气过滤中过滤材料的几种纤维性能,重点介绍了高性能聚四氟乙烯纤维在过滤材料中的应用。 相似文献
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袋式除尘器与环境保护 总被引:11,自引:0,他引:11
袋式除尘器是治理大气污染的高效除尘设备 ,袋式除尘器和过滤材料 (本文指制作袋式除尘器滤袋的主要材料 )在钢铁、水泥、有色、冶金等十几个行业中得到了广泛应用 ,运行稳定 ,效果良好 ,过滤材料的寿命延长 ,品种、数量都显著增加。随着环保法规日益严格 ,排放浓度标准的提高 ,袋式除尘器和过滤材料 ,尤其是高温袋式除尘器 ,耐高温、防腐蚀的过滤材料将得到迅猛的发展。 相似文献
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纤维过滤材料在目前的气体过滤材料中是应用较为广泛的一种材料,纤维过滤的过滤机理比较复杂。本文阐述了纤维过滤材料的多种过滤机理,以及纤维过滤材料的几种应用. 相似文献
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随着洁净煤发电技术的发展及环保要求的提高,高温气固分离技术取得了重要的进展。本文阐述了在高温过滤材料方面,经过了早期的金属多孔材料、均质陶瓷多孔材料、纤维增强陶瓷复合材料、金属合金及金属间化合物多孔材料等四个阶段的探索,逐渐形成了陶瓷粉末、陶瓷纤维、金属粉末、金属纤维和金属丝网等多种高温气体过滤元件,催化与过滤复合元件近年来也逐渐得到工程应用。此外,在高温过滤元件表面粉尘层结构、脉冲反吹循环再生、高温过滤器结构设计及实时运行优化等方面都取得了重要的技术进展。目前,高温气体过滤技术及装备已在煤气化、催化裂化、冶金及垃圾焚烧处理等方面得到了广泛的应用,其适用的温度范围为260~650℃,压力范围从常压到6.0MPa,过滤效率达到了99.9%以上,可有效除净1μm以上的颗粒,净化后气体中的颗粒物含量低于5mg/m3。指出随着国家经济转型和环保排放要求的提高,高温气体过滤技术在产品质量升级、高温余热利用及颗粒物排放控制等领域具有更加广泛的应用前景。 相似文献
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气液聚结元件在压缩气体净化等工业领域应用广泛,目前聚结元件的性能难以满足行业不断增长的需求,但是提高聚结元件过滤效率的同时,阻力也会随之升高,不利于其综合性能的优化。为研制低阻高效的聚结元件,利用不同浓度氟硅氧烷丙烯酸酯溶液对聚结滤材进行疏油改性,分析了表面能不同的滤材在气液过滤过程中压降、过滤效率以及二次夹带现象的变化,并对改性在聚结滤芯上的应用效果进行研究。结果表明,改性滤材在过滤效率提高10%的同时,稳态压降可降低约30%。滤材表面性质变化导致的跳跃压降减小是稳态压降降低的主要原因;滤材内液体分布对扩散、惯性分离作用的增强以及二次夹带的减少是效率提高的主要原因。对于表面能不同的疏油滤材,稳态压降和效率均随表面能的减小而升高。聚结滤芯经过改性后品质因子最大可提高92%。 相似文献
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Influence of oleophobic modification on gas-liquid filtration performance of glass fiber coalescing elements
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Gas-liquid coalescing elements are widely used in industrial fields such as compressed gas purification. Currently, the performance of coalescing elements is difficult to meet the growing needs of the industry. However, while increasing the filtration efficiency of the coalescing element, the resistance will increase simultaneously, which is not conducive to the optimization of the comprehensive performance. To develop low-resistance high-efficiency coalescing elements, the coalescing filter materials are modified by different concentrations of fluorosilicone acrylate solution. The evolution of pressure drop, filtration efficiency and secondary entrainment of the filter materials with different surface energy during the gas-liquid filtration process were analyzed, the modified filter materials were fabricated into coalescing filters for verification. The results showed that, the filtration efficiency of the modified filter materials was increased by approximately 10%, and the steady-state pressure drop was reduced by approximately 30%. The decrease in jump pressure drop caused by changes in the surface properties of the filter materials is the main cause of the decrease in steady-state pressure drop. The increase in filtration efficiency is caused by the enhancement of diffusion and inertial separation, and the reduction of secondary entrainment. For oleophobic filter materials with different surface energy, the pressure drop and filtration efficiency increase with the decrease of surface energy. The quality factor of the coalescing filter element can be increased by up to 92% after modification. 相似文献
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Mónica Lupión Francisco J. Gutiérrez Ortiz Benito Navarrete Vicente J. Cortés 《Fuel》2010,89(4):848-43
An extensive experimental campaign has been carried out in a hot gas filtration test facility so as to test several filtering elements and configurations, particularly, three different types of bag filters and one ceramic candle. The facility was designed to operate under a wide range of conditions, thus providing an excellent tool for the investigation of hot gas filtration applications for the advanced electrical power generation industry such as IGCC, PFBC or fuel cell technologies.Relevant parameters for the characterisation and optimization of the performance of the filters have been studied for a variety of operating conditions such as filtration velocity, particle concentration, pressure and temperature among others. Pressure drop across the filter, cleaning pulse interval, baseline pressure drop, filtration efficiency and durability of the filter have been investigated for each type considered and dependences on parameters have been established. On top of that, optimal operating conditions and cleaning strategies were determined.The tests results show that bag filters are a suitable alternative for the hot gas filtration due to the better performance and the high efficiency observed, which makes them suitable for industrial applications operating under high temperature high pressure conditions considered within the study (200-370 °C and 4-7.5 barg, respectively). 相似文献
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介绍一种有效的热熔胶粘剂过滤的新方法。为了保证产品的质量,在230℃左右,对高黏度熔融胶体进行过滤,以达到去除夹杂的固体杂质颗粒、焦块和团块状凝胶目的。该方法的过滤装置采用单筒结构,多个终缩聚釜可共用一个过滤装置。在过滤装置中安装多个特殊的过滤组件,过滤物料在一定压力的推动下均由滤芯外部向其内部流动,并从滤芯下端流出进入水下切粒工序。该方法过滤效率高,胶粒质量好。对设计用于高温高黏度胶体生产的熔体过滤器具有参考价值。 相似文献
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本工作利用聚结滤芯过滤性能实验装置,通过改变滤芯内部的滤材排布,研究了聚结层为单一滤材以及由不同滤材排布组合的滤芯过滤性能,分析了聚结层排布方式对过滤效率、压降、饱和度及液体分布的影响。结果表明,由单一滤材组成的滤芯过滤效率随滤材孔径减小而增大,但孔径最小时由于压降较高,导致滤芯综合过滤性能反而最差。疏油在前、亲油在后的聚结层排布方式可提高滤芯过滤效率、减少液滴二次夹带,且以两层相同滤材交错排列的滤芯过滤效率比单层滤材交错排列明显更高,压降也相对较低,使得综合过滤性能显著提升。继续增加进气侧的疏油滤材层数可延缓压降增长、提高运行寿命,滤芯稳态品质因子达到最大值(0.30 kPa-1)。聚结层排布方式对滤芯过滤性能的影响主要通过改变液体分布形式而实现,且末层滤材的通道结构变化是导致不同聚结层排布方式的滤芯过滤性能出现差异的主要原因。 相似文献
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与常用的板框过滤器相比,CUNO 过滤器具有操作方便、占用空间小、过滤效率高等特点。介绍了该过滤器的结构及其工作原理。比较了过滤器的不同过滤芯的过滤效率。讨论了CUNO 过滤器在涂料、磁性记录介质、化妆品中的应用 相似文献