水泥窑协同处置用新型覆膜滤料性能研究

为满足水泥窑协同处置固废技术的需求,开发了新型耐酸玻璃纤维/P84复合毡覆膜滤料(以下简称F-NS覆膜滤料)。对比研究了该滤料与普通玻璃纤维/P84复合毡覆膜滤料(以下简称常规滤料)的性能,结果表明该滤料断裂强力及耐酸性能明显优于常规滤料。对协同处置水泥窑尾粉尘进行了粒径分析,并测试了耐酸滤料的孔径分布,最后利用粉尘过滤效率测试系统对F-NS覆膜滤料进行了过滤性能测试,测试结果均表明该滤料拥有良好的过滤性能。     

缝纫工艺对超低排放覆膜滤袋过滤效率的影响研究

针对粉尘高排放行业常用的PTFE覆膜滤料,结合"超低排放"的除尘技术要求,研究了不同缝纫工艺对滤袋缝合处过滤效率的影响。通过VDI滤料模拟测试装置、SEM等先进仪器对覆膜滤料的性能进行测试分析,比较了常规PTFE覆膜滤料和滤袋缝合处的过滤效率。结果显示,使用粗旦PTFE缝纫线能有效地降低针孔透灰,从而保证超低排放的过滤要求。     

用于大气烟尘治理的超净排放滤料过滤性能评价与研究

袋式除尘的核心是过滤材料,而超净排放滤料是过滤材料发展的新技术。针对大气烟尘治理中常用过滤材料,借助动态过滤性能测试装置、冷场发射电镜、孔径分析仪等表征手段,研究其过滤性能指标随运行时间的变化规律。结果表明,覆膜化纤毡滤料的残余压差变化最小,过滤精度高且过滤性能最稳定。覆膜玻纤布的清灰频率最高,使用风险较大。同时,分析了不同滤料在应用过程中孔径、透气等性能指标的变化规律及原因,为各行业烟尘治理用超净排放过滤材料的优选找到方向。     

一种中空纤维滤料过滤性能研究

为了解天然气净化中使用的中空纤维的过滤性能,采用均匀设计法~([1])实验,DPS数据回归处理方法~([2])分析结果,影响未覆膜滤料过滤性能的因素为:过滤速度含尘浓度过滤时间;对于覆膜滤料,过滤时间和含尘浓度影响极小,影响过滤性能的因素主要为过滤速度。采用CFD数值模拟对颗粒在滤料层内部的过滤细节进行分析,得出:中空纤维的内部结构对大颗粒的捕集影响较大;而对于细微颗粒,只能通过提高过滤精度来提增大收尘效率。     

新型高精度过滤材料的设计与开发

高温烟气过滤材料通过纺织材料的微孔结构对烟气中的粉尘进行拦截,从而达到过滤清洁的目的。传统针刺过滤材料受工艺设备的影响,滤料结构中孔径较大,对直径极其微小的粉尘颗粒过滤性差,从而影响滤料的过滤精度。采用全水刺加工工艺,结合超细纤维层结构,制备了全水刺超细纤维复合滤料。与传统针刺滤料、覆膜滤料以及超细纤维针刺滤料相比,全水刺超细纤维复合滤料具有更微小的孔径,且滤料结构中没有较大的穿透性针孔结构,产品可以有效拦截更微小的粉尘颗粒,过滤性能更好,同时测试压差与针刺滤料水平相当,性能更优良,适用于多种高精度过滤工况环境。     

水泥厂用聚四氟乙烯覆膜滤袋性能优化

1前言 近年,环保部门对水泥工业的排放严格管控,出现了一种新型滤料—覆膜滤料。该覆膜滤料的关键膜材是e PTFE微孔滤膜,此薄膜的微孔结构改变了普通滤料的过滤机理,由普通滤料的深层过滤转变成为表面过滤[1]。性能良好的滤料必须有合适的空隙和结构[2],e PTFE薄膜是立体网状、交叉微孔结构,这种微孔滤料可以补集大多数粉尘颗粒,使粉尘无法通过该膜的表面到膜或者基材中去[3]。     

反吹风玻璃纤维覆膜滤料的研制及应用

通过对膨体过滤布、滤布表面处理技术、ePTFE膜以及覆膜工艺的研究,研制出过滤效率高、运行阻力低的反吹风玻璃纤维覆膜滤料,并对该种滤料的应用进行了实例举证,例证表明反吹风覆膜滤料清灰效果好,使用的反吹风强度较低,大大延长了滤料的使用寿命,降低了产品的运行费用.     

燃煤电厂用耐高温滤料的研究与应用前景分析

概述了耐高温化学纤维的性能及现状,介绍了燃煤电厂除尘滤料的选型方法.使用VDI设备,对比测试分析了PPS混纺覆膜滤料与PPS超细化纤滤料的除尘效率,证明了PPS混纺覆膜滤料在火电行业除尘效率方面的优越性,并列举了其在燃煤电厂中的应用案例及使用情况,阐明了PPS混纺覆膜滤料的使用是燃煤电厂未来超净排放的趋势.     

窑头和窑尾袋式除尘器滤料的应用分析

普通的非覆膜滤袋,纤维孔隙大,只能依靠粉饼过滤,细颗粒物PM2.5穿透现象严重,难以达到理想的排放值;而薄膜滤料孔隙致密,过滤精度高,薄膜代替粉饼,排放低,压差更低。戈尔覆膜滤料的薄膜兼顾高透气性及耐磨损双重性能,广泛用于窑尾窑头的废气处理。河北鹿泉金隅鼎鑫公司的技术改造效果是:用了7年的玻纤覆膜滤料不但排放依然在10 mg/Nm~3以内,而且压差始终没有超过800 Pa。     

电力行业用新型高防酸处理玻纤布覆膜滤料的性能研究

针对电力行业酸性烟气工况的特点,开发了新型高防酸处理玻纤布覆膜滤料。对比研究了新型高防酸处理与常规处理玻纤布覆膜滤料的防酸性能、防水性能,结果显示新型高防酸处理玻纤布覆膜滤料相比普通玻纤布覆膜滤料具有明显的防水、防酸优势。     

高温过滤材料的现状与发展趋势

介绍了随着国家对环保标准的不断提高,袋式除尘器的发展与应用,阐述了袋式除尘器的核心--高温滤料以及纯玻纤滤料种类、性能和优缺点,芳纶纤维、PPS纤维、P84纤维、PTFE纤维的性能及它们分别与玻璃纤维混杂复合后其复合滤料的性能和优缺点。随着新技术和新材料的应用,高温袋式除尘技术的应用不断发展。     

A study on the effects of laminating temperature on the polymeric nanofiber web

The use of fine fiber has become an important design tool for filter media. Nanofibers-based filter media have some advantages such as lower energy consumption, longer filter life, high filtration capacity, easier maintenance, low weight rather than other filter media. The nanofibers-based filter media made up of fibers of diameter ranging from 100 to 1,000 nm can be conveniently produce by electrospinning technique. Common filter media have been prepared with a layer of fine fiber on typically forming the upstream or intake side of the media structure. The fine fiber increases the efficiency of filtration by trapping small particles, which increases the overall particulate filtration efficiency of the structure. Improved fine fiber structures have been developed in this study in which a controlled amount of fine fiber is placed on both sides of the media to result in an improvement in filter efficiency and a substantial improvement in lifetime. In the first part of this study, the production of electrospun nanofibers is investigated. In the second part, a different case studyis presented to show how they can be laminated for application as filter media. Response surface methodology (RSM) was used to obtain a quantitative relationship between selected electrospinning parameters and average fiber diameter and its distribution.     

Electrospun nanofibers with application in nanocomposites

The use of fine fiber has become an important design tool for filter media. Nanofibers-based filter media have some advantages such as lower energy consumption, longer filter life, high filtration capacity, easier maintenance, low weight rather than other filter media. The nanofibers-based filter media made up of fibers of diameter ranging from 100 to 1,000 nm can be conveniently produce by electrospinning technique. Common filter media have been prepared with a layer of fine fiber on typically forming the upstream or intake side of the media structure. The fine fiber increases the efficiency of filtration by trapping small particles, which increases the overall particulate filtration efficiency of the structure. Improved fine fiber structures have been developed in this study in which a controlled amount of fine fiber is placed on both sides of the media to result in an improvement in filter efficiency and a substantial improvement in lifetime. In the first part of this study, the production of electrospun nanofibers is investigated. In the second part, a different case studyis presented to show how they can be laminated for application as filter media. Response surface methodology (RSM) was used to obtain a quantitative relationship between selected electrospinning parameters and average fiber diameter and its distribution.     

Mikroporöse Filtermedien für die Kuchenfiltration

Microporous filters media for cake filtration. Improved knowledge about filtration conditions, capillary phenomena in filter cakes and in filter media, as well as the properties of membranes permit the use of microporous membranes in cake-forming filtration. This allows removal of moisture without passage of gas and yields a particle-free filtrate. Apart from metallic and ceramic membranes, polymeric membranes prove highly suitable as microporous filter media since they permit utilization of the entire range of filter equipment. The present article considers first the fundamentals of cake-forming filtration, then surveys the various membrane systems, and finally discusses process-engineering aspects of filtration with microporous filter media.     

玻纤覆膜滤料在水泥熟料生产线中的应用

介绍了福泰(Filtex)覆膜滤料在4500t/d带纯低温余热发电水泥熟料生产线中的应用与维护。通过对覆膜滤料使用情况的跟踪与数据分析和定期抽换检测,及时了解滤料在该项目上的积灰程度、是否结露、强度损失等工作情况,对个别破袋现象和结露现象进行及时的处理并总结了维护经验。     

Einsatzkriterien für textile Filtermedien

Criteria for the use of textile filter media . The chemical, thermal and mechanical requirements that have to be taken into consideration for the selection of a filter medium, with regard to the kinds of synthetic fibers (related to today's filter uses), for the different procedures involved in wet and dry filtration are described. The influence of the structure of the filter fabric, in both pore and mesh and it's effect on filter efficiency is shown. The requirements for making-up are explained and the possible types of elements for use in textile filter media are mentioned.     

新型玻纤布覆膜滤料在燃煤电厂袋式除尘器上的应用

介绍了玻纤布滤料发展及应用,并对玻纤布覆膜滤料代替PPS滤料用于电力行业袋式除尘器的可行性进行分析,讨论了玻纤布滤料与电力行业传统用PPS滤料的性能差距以及成本优势。针对国外玻纤布滤料早在燃煤电厂袋式除尘有长期应用的案例,开发出了新型玻纤布覆膜滤料,成功应用于2×200 MW燃煤机组烟气净化,实际使用效果良好。     

核级玻璃纤维滤材的研制

研制出能满足核电站使用的玻璃纤维滤材。其关键技术是防止或减少SiO2在硼酸和氢氧化锂水溶液中析出的核级滤材处理剂的研发,运用专有的玻璃纤维湿法造纸技术,生产出核级玻璃纤维滤材的坯纸,对其进行贵重添加剂处理,烘干后在坯纸的两面复合有机纤维保护层。现已成功用于巴基斯坦恰希玛核电站。     

Theoretical Modeling of Filtration by Nonuniform Fibrous Filters

Modeling commercial filter media using classical theories results in incorrect filter pressure drop and efficiencies and this is attributed to media inhomogeneity. The use of an arbitrary inhomogeneity factor is seen to be inadequate in accounting for the effect of operating conditions on the performance of inhomogeneous filter media. A simplistic theoretical modeling approach is described here to account for the variations in filter packing densities and to estimate their effect on the media particle capture characteristics. The theoretical modeling results are used in obtaining an equivalent filter packing density distribution from media local efficiency measurements. Considering this variation in the theoretical models is seen to result in better prediction of media performance over a wide range of operating conditions. The observed deviation of experimental efficiencies from the theory at smaller Peclet numbers can be explained from the results of the theoretical analysis.     

Design and Optimization of Fibrous Filter Media Using Lifetime Multipass Simulations

The goal of this study was to optimize fibrous filter media by increasing the dust holding capacity (DHC) while maintaining the β ratio and initial pressure drop of the filter media. The key was the use of microstructure models to optimize the filter media. The microstructure of three different variations of a filter media for oil filtration was modeled by using the FiberGeo module of the GeoDict® software package. It was found that by optimizing the fiber volume distribution over the height of the filter media, higher DHC values could be achieved while keeping the pressure drop considerably low. This confirms the hypothesis that the macroscopic properties of the filter element can be improved by modifying the microstructure of the filter media.