电袋复合除尘器在水泥厂改造中的应用

电袋复合除尘器是集成静电过滤的除尘机器,具有清灰周期长、使用寿命长、运行阻力小等特点,适用于水泥行业这种粉料环境,能够有效实现高效清灰目的。电袋复合除尘器集合了电除尘和袋除尘的优势,并进行技术升级。虽然电除尘器的改造措施大体上有静电布袋串联、静电布袋并联、电袋一体、低压脉冲喷吹式四种改造措施,但结合水泥厂的实际情况,水泥厂电除尘器改造还是以静电布袋这种改造方案居多。     

采用电袋复合除尘器后出现的问题及解决办法

2010年4月在大修期间对窑尾电除尘器进行技改,技改方案为保留电除尘一、二电场,将第三电场改为袋除尘,改后为电袋复合除尘器。运行一年多来,出现袋除尘清灰风机取风口选择不当、袋口密封不严、清灰系统气箱钢丝绳断、空气冷却器管道易磨损等问题,造成除尘器压差过大,多次被迫停窑处理,影响窑正常运行。为此,我们采取多项措施,解决了问题。     

长袋脉冲袋除尘器文氏管配置探析

文氏管是长袋脉冲袋除尘器（也叫行脉冲袋除尘器）清灰系统的可选部件之一,但不是清灰系统的必需部件.本文就清灰系统是否需要文氏管、何种情况需要作一分析.     

袋除尘器清灰阀短路故障的检测

<正>针对清灰阀(脉冲阀和提升阀的统称)出现故障影响袋除尘器正常使用的问题,我们在袋除尘器原控制系统基础上通过增加检测硬件,进行软件编程和组态等,来实现对袋除尘器清灰阀中常见的短路故障的检测功能,达到及时发现故障和方便排除故障的目的。本文以某3 200t/d生产线窑尾电改袋项目为例进行说明。1问题的提出及设计流程因袋除尘器清灰阀数量较多,且多处于露天环境,加上现场电气施工人员施工水平参差不齐及恶劣     

窑尾电袋复合除尘器超低排放升级改造

针对惠州某水泥厂窑尾电袋复合除尘器运行不稳定,暴露出的清灰效果不好、压力损失过大等缺陷,通过分析论证,将原电场改造为脉冲袋除尘器,优化除尘器进口均风装置,重新降阻设计出风管至尾排风机进口风管和控制系统,解决了设备阻力偏高、除尘效率低、粉尘排放浓度超标、耗电率高等实际问题。     

电袋复合除尘器在5000t/d生产线窑尾的应用

由于国家新的水泥行业粉尘排放标准的提高,水泥窑采用电除尘器已难以满足要求。但是,由于一部分水泥窑炉烟气含尘浓度高,仅依赖袋除尘器,存在阻力过高,清灰频繁及滤袋使用寿命偏低等问题。因此,在电除尘器电场数较多的条件下,将其改造为电袋复合除尘器也是一种可取的方案,可充分发挥电除尘器第一电场除尘能力高的特点。在对辽阳千山水泥有限公司5　000t/d生产线的窑尾原电除尘器本体结构、运行参数、工艺流程进行研究的基础上,本文主要对电改电袋复合除尘器的方案设计及结构优化进行了分析。     

袋除尘器的气振清灰法

本文介绍一种新式袋除尘器的清灰方法，即利用空气炮压缩空气喷爆装置，对袋除尘器进行清灰，具清灰效率高，布袋受力均匀，成本低等特点，适合水泥厂内高含尘浓度气体的收尘之用，通过实验实测，用这种清灰法，袋除尘器的收尘效率达９９％以上，在清灰机理方面，本文认为气振式清灰是利用振动分离的原理，空气炮的喷冲力主是激励力，因此空气炮的喷爆能量大小是影响清灰效果的主要因素。     

10m超长脉冲袋除尘器喷吹性能的研究

本文在完成10 m长袋除尘器设计的基础上,对喷吹过程中的袋内压力状况进行了测试,而作为清灰薄弱环节的袋底是否具有良好的清灰效果是本次研究的重点,通过对清灰过后除尘器阻力进行测试发现,10 m长袋除尘器清灰效果良好,可以在低阻状态下运行.     

水泥窑头电除尘器改气箱脉冲袋除尘器的实践

近几年来国家粉尘排放标准日益严格,国内水泥生产线电除尘器改造项目大量进行,改造的主要形式有电改电、电改袋和电袋复合三种,其中又以电改袋为主流技术。在目前国内已实施的电改袋项目中,绝大部分是利用原电除尘器高度上的优势,将其改造成低压长袋型除尘器。改造后的低压长袋除尘器往往采用直径Φ160mm,长6~8m甚至8m以上的滤袋,配套3寸或4寸的淹没式脉冲阀,进行点对点的脉冲清灰。这种改造模式比较成熟,在水泥行业窑头、窑尾除尘器改造中应用广泛,但改造成本与新上一台低压长袋除尘器相比节省不多。在水泥行业整体利润率下滑的情况下,环保除尘行业思考如何降低改造成本,提升市场竞争优势很重要。     

生料库顶除尘器的改造

我公司于1996年建厂，随着使用时间的延长，收尘系统出现了不少问题。为此，2008年在对熟料库底脉冲除尘器在线清灰改造的经验基础上，对生料库顶的一台大型旋风式除尘器进行了改造，先将其更换为分室反吹袋除尘器，后又改为脉冲袋除尘器。     

Characteristics of electrostatic cyclone/bag filter with inlet types (lab and pilot scale)

The main purpose of this study was to investigate experimentally the characteristics of an electrostatic cyclone/bag filter with inlet types (upper and bottom inlet) in order to overcome the low collection efficiency for submicron particles and high pressure drop, which were the main problems of general fabric bag filters. The experiment was performed to analyze the collection efficiency and pressure drop of the electrostatic cyclone/bag filter compared with that of conventional fabric bag filters with various experimental parameters such as the inlet type (upper and bottom), inlet velocity (filtration velocity) and applied voltages. From the results, the upper inlet type showed a slightly higher pressure drop reduction ratio as 40–90% than that of bottom inlet. In addition, the electrostatic cyclone/bag filter represented an increment of over 5% for the collection efficiency of submicron particles (around 1 Μm) in comparison with the general fabric filter. Presented at the Int’/Sym. on Chem. Eng. (Cheju, Feb. 8–10, 2001), dedicated to Prof. H. S. Chun on the occasion of his retirement from Korea University.     

A study on the characteristics of improvement in filtration performance by dust precharging

A hybrid dust-collector combining electrostatic charging with fabric filtration was developed and its performance characteristics were evaluated. Charged particles build porous dendritic structure on the filter surface by electrostatic attraction, increasing the collection efficiency of dust particles and reducing the pressure drop through the deposited dust layer and filter media. The cleaning performance of the dust layer is improved because the dendritic structured dust layer may be removed more easily by pulse jet cleaning flow. The results of the experiment showed a reduction of fine particle emission by 37% and 13% energy saving by precharging dust particles before filtration.     

Improved Lower Particle Size Limit for Aerosol Time-of-Flight Mass Spectrometry

Laboratory and field tests have shown that electrostatic precharging can lead to a substantial decrease in the flow resistance of fabric filters. For lead smelter dust, the effectiveness of the precharger is dependent on the relative humidity of the suspending gas. For relative humidities below 5%, severe back corona occurs in the precharger, which results in poor particle charging and little improvement in filter performance. For relative humidities between 5% and 40%, little or no back corona occurs, precharging is effective and results in a reduction of up to 60% in the flow resistance of the fabric filter. The operational range of the precharger can be extended to lower relative humidities by cooling the earthed electrode. The improvement in filter performance can be achieved without the precipitation of large quantities of dust in the precharger.     

机织滤布的生产与使用

介绍了国外固液分离用机织滤布的生产与使用现状，分析了国外过滤介质孔径，开孔率，透水和透气性能等测定标准，对机织滤布的材料，织造，精整加工技术等的发展趋势进行了讨论了，并着重介绍了目前重点发展的单丝滤布，双层复合滤布和涂膜滤布。     

PTA装置精制过滤机运行的影响因素及对策

总结了影响精制过滤机正常运转的几个主要因素,分别是水洗或碱洗后液位控制阀经常堵塞、过滤机进料泵的电机温度超高、下料螺杆电机经常高电流跳闸、过滤机的滤布上不易形成滤饼。对工艺操作进行了优化,找出了维持过滤机长周期平稳运行的可行性方法。     

提高磷酸装置转台式过滤机滤布再生效果的技改

介绍磷酸过滤过程中滤布再生的工艺原理,分析滤布再生效果差的原因,提出提高滤布再生效果的相关技改措施.改造后,滤布再生效果提高,过滤机清理周期从1d延长到15d,产能由P2O520 t/h提高到30 t/h.     

Development of a photoreactive fabric filter for simultaneous removal of VOCs and fine particles

A fabric filter sampling system was manufactured by using a UV lamp and a plate-shape sample fabric coated with titanium dioxide (TiO₂) sol to develop a photoreacting fabric filter capable of simultaneously removing dust particles and volatile organic chemicals (VOCs) from contaminated air streams. Variations of pressure drop across the fabric as well as toluene vapor removal efficiency were investigated and examined with respect to various conditions such as the injection duration of dust-laden gas, the photocatalyst particle size, the toluene vapor load, and the photocatalyst load. Again, variations in air permeation and the tensile strength of fabrics with the photocatalyst load were measured and examined to determine the appropriation of nonwoven fabric as a supporter for the photocatalyst. The toluene removal efficiency of this new generation fabric filter was manifestly significant, and a possible deficiency in removal efficiency would be solved through the appropriate design and serial arrangement of a multichannel photoreactor consisting of fabric media coated with the photocatalyst.     

Thermally bonded nonwoven filters composed of bi‐component polypropylene/polyester fiber. II. Relationships between fabric area density,air permeability,and pore size distribution

The relationships between the pore size, fabric area density, and air permeability of the three‐dimensional (3D) nonwoven filter samples produced using a new 3D forming process has been studied. Results indicate that the thermally bonded nonwoven filter samples consist of multiple filtration layers of interconnected pores and tortuous pore paths through the fabric thickness. Both the bubble point pore diameter and the mean flow pore diameter of the produced filter samples increase linearly with increase in the reciprocal of the fabric area density. The air permeability of the nonwoven filter samples decreases significantly to a certain value with increasing fabric area density, and then becomes almost stable with further increasing of fabric area density. The measured pore size data in the thermally bonded nonwoven samples were found to follow all the bi‐normal, bi‐lognormal, and bi‐Weibull distributions. Taken into account together the pore structure, pore size distribution, air permeability, and fabric area density, the new 3D forming system can substitute most of the commercial polyester filter media with significantly reduced costs. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 2264–2275, 2006     

Afterclearing of disperse dyed polyester with gaseous ozone

The efficiency of ozone treatment for the clearing of disperse dyed polyethylene terephthalate fibres has been examined. The ozone treatment for the clearing of the dyed samples was performed by blowing the ozone gas from the ozone generator on to the wet fabric samples. The results indicated that 3‐ and 5‐min ozonation times were appropriate to achieve comparable wash fastness results with conventional reduction clearing without significant colour differences (ΔE* value) for the samples dyed with CI Disperse Yellow 23 and CI Disperse Blue 79, respectively; however, the ozonation time had to be increased to 15 min for CI Disperse Red 82. Tensile strength tests and scanning electron microscopy analysis indicated that the ozone treatment did not cause any severe damage to the fabrics. Ozone treatment for the afterclearing of disperse dyed polyester fabric can lead to energy and time savings and environmental load reduction when compared with conventional reduction clearing. This study tested a new method of ozone application for clearing of disperse dyed polyester by blowing ozone directly on to the fabric samples. This new method of application has the advantage of being readily adoptable for continuous treatment lines and lower water consumption.     

脉冲袋除尘器在水泥窑尾上的应用分析

通过对窑尾静电除尘,反吹风除尘和脉冲袋除尘的应用分析,总结出脉冲袋除尘的性能优势。在此基础上,重点就滤料的选择与成本分析,过滤风速的控制以及脉冲袋除尘器的使用经验和结构优化等方面进行了一一介绍和总结比较。