高效过滤——高流量液体过滤产品在LCD制造工艺中的应用

本文介绍了高流量过滤产品3M^TM 700系列高流量滤芯在LCD制造工艺中的应用。通过对工艺过程和现场数据的分析，显示了高流量滤芯在水处理以及液体循环过滤中的巨大优势，对其在固液分离领域中的应用具有重要的借鉴和推广作用。     

PP棉滤芯与胶印润版液过滤级数的关系

目的研究PP棉滤芯对胶印润版液的过滤净化性能,在满足过滤要求的前提下,为胶印机润版液过滤系统选择合理的过滤级数。方法设置四级润版液过滤净化系统,以0.5,1μm孔径的PP棉滤芯作为过滤介质,测量润版液经过每级过滤前后的p H值、电导率和表面张力。结果以孔径1μm的PP棉滤芯作为一级过滤,0.5μm的PP棉滤芯为二级、三级、四级过滤滤芯,经过第4级过滤后,润版液核心参数处于印刷要求范围内,但变化率不足1%。结论此类胶印润版液过滤装置最优过滤级数为三级过滤。     

全面的过滤解决方案3M高流量过滤系统在天然气净化处理中的应用

天然气净化处理工艺中涉及很多过滤应用，包括气体过滤和液体过滤。本文重点介绍了3M过滤产品在胺液脱硫工艺中天然气进口过滤和胺液过滤中的应用，结合工艺过程的介绍以及具体案例的数据分析，为天然气净化工艺的系统过滤解决方案提供了参考和选择依据。[编者按]     

胶印润版液循环过滤技术的应用研究

目的针对胶印润版液的排放现状,研制润版液循环过滤技术及设备,以实现润版液的循环使用,达到节省生产成本、增加工作效率、提升产品质量等目的。方法采用双级不同循环过滤装置对胶印润版废液进行循环过滤生产应用实验,通过测试其酸碱度(pH值)、电导率、表面张力等印刷生产核心技术指标,进行过滤前后的对比分析,研究不同孔径滤芯的过滤效果、对润版液有效成分影响、产品质量的影响。结果经孔径分别为0.5,1μm的PP棉滤芯过滤后,测得pH值分别为5.27,5.20,电导率分别为720,773μs/cm,表面张力分别为58.45,58.42 mN/m,各核心参数均在印刷正常生产要求范围之内。结论结合滤芯的成本及应用实验寿命测试数据,确定循环过滤装置使用PP棉滤芯8根(孔径0.5,1μm各4根),为较佳配置。     

浅谈过滤机的应用与选择

浅谈过滤机的应用与选择杭州桐庐三达过滤机厂（３１１５００）刘万丰选择过滤机，首先应根据镀槽体积、镀种来确定流量、过滤量，确定应配置的过滤介质、滤芯精度。如化学镀镍循环过滤，对过滤机的材质、耐温、耐酸程度等都有一定的要求。一般地说，过滤机设计及标明的流...     

几种陶瓷过滤材料的过滤机理研究

由多孔陶瓷材料制备的过滤元件在分离、净化领域得到日益广泛的应用,陶瓷过滤器的过滤机理和过滤效率的研究、表征日益受到重视.综述了泡沫陶瓷、普通多孔陶瓷管、陶瓷过滤膜过滤机理的研究进展.泡沫陶瓷主要通过滤饼机制、表面效应、整流效应来达到净化金属液的效果.     

几乎永不损坏的阻火呼吸阀

Protego公司可生产几乎永不损坏的阻火呼吸阀。该阻火呼吸阀是横向固定形式，采用了强劲的阻火滤芯，增强了机械强度和工作稳定性。该技术可用于各种流量和精度等级，可以对各种材料进行过滤。另外，阻火滤芯内部的分级结构使得阻火呼吸阀和滤芯之间有较大的间隙，维护保养性能好。     

展品预览

GKN烧结金属过滤器材公司SIKA AS滤芯，阿法拉伐（上海）技术有限公司Compabloc全焊型换热器，上海飞潮科贸有限公司飞潮“速可清”自动过滤、分离、洗涤、浓缩、增稠系统,北京嘉和雷柏特科技有限公司紧急冲淋洗眼器[编者按]     

洁净煤用高温非对称陶瓷过滤管性能测试研究

就自行研制的洁净煤用高温非对称陶瓷过滤管理化性能进行综合测试。结果表明，该过滤管具有高的机械强度、良好的抗热性能、使用温度高、耐化学腐蚀和高透气率，完全达到了用于高温气固分离(包括粉煤灰过滤等)所需要的各项物理和化学性能指标的要求。     

金属橡胶组合滤材过滤性能实验研究

理想的液固相过滤材料应该是由多种不同过滤特性的材料组合而成,这种滤材能够最大程度地发挥滤材截留悬浮颗粒的能力,延长过滤材料的使用寿命。金属橡胶作为一种新型弹性多孔功能材料,自身诸多的性能优点使其适合制备各种过滤器。采用国际标准ISO16889-1999评定滤芯过滤性能的多次通过方法,详细研究和对比不同结构参数的金属橡胶组合滤材与整体式金属橡胶滤材的过滤性能。研究结果表明,由不同结构参数构成的金属橡胶组合滤材具有更加优异的过滤特性,在过滤效率相同的情况下,组合金属橡胶滤材过滤压降较低,流体的通过性能更好,在达到极限压降前能够容纳更多的污染物,滤材使用寿命大为延长,过滤性能得到充分的发挥。     

静电纺丝技术在过滤中的应用进展

静电纺丝技术制备的纳米纤维,具有高比表面积、大孔隙率和三维互通孔道,被认为是一种前景很好的过滤分离介质.本文对电纺丝在过滤中的应用做了综述,简要介绍了电纺丝应用于过滤的国内外发展及现状,特别是产业情况.目前,电纺丝过滤介质研究和应用主要集中在空气、液体、亲和膜及功能过滤膜等几个方面.     

Analysis of the performance of a sintered stainless steel wire mesh filter for cryogenic liquid purification

As a traditional and mature solid-liquid separating technique, filtration has been adopted in cryogenic liquid purification system owing to its low energy cost, simplified system, long lifetime and high purifying efficiency. Whereas, few data or result of filtration performance at low temperature is put forward in literatures, most of which are related to room and high temperatures applications. Furthermore, as an excellent cryogenic material, stainless steel medium is suitable for cryogenic liquid filtration, which is also seldom reported. In this paper, we propose a filtration system for purifying CO₂ particles from liquid nitrogen using a sintered stainless steel wire mesh filter with a nominal filtration degree of 0.5 μm, and characterize the separation behavior of this kind of filter medium at cryogenic temperature. Experimental results show that the whole filtration process can be divided into three stages with sufficient particle concentration in the feed slurry according to the evolution of pressure drop. Differences between surface filtration and depth filtration are demonstrated, and the influence of growth of filter cake is characterized. Pressure drop increases with increasing feed slurry flow and CO₂ concentration, and evolution tendency of filtration efficiency is affected by its calculation method. By comparison with the filtration at room and high temperatures, the effects of temperature on the fluid and media are emphasized.     

CFD-DEM analysis of internal packing structure and pressure characteristics in compressible filter cakes using a novel elastic–plastic contact model

Cake-forming filtration is a proven method for separating particles from suspensions. Most filtration models are based on the simplification of incompressible and homogeneous cake structures. However, most filter cakes are in fact unevenly compressed by e.g. the high transmembrane pressures, leading to dense structures with high flow resistance at the filtration membrane. Experimental investigations of these inhomogeneous cakes are challenging due to mostly invasive procedures after filtration has already taken place. In contrast, numerical methods can provide extensive information about fluid flow, particle separation and cake formation during filtration. However, this requires that both elastic and plastic particle deformation and forces are modeled correctly. To achieve this, the present study implemented a novel elastic–plastic DEM model that only requires measurable material parameters and therefore does not need any fitting. Subsequently, previously measured material parameters for elastic–plastic cellulose-lactose pellets (MCC) were used to investigate the packing density, fluid pressure levels and contact forces inside compressible filter cakes using CFD-DEM coupling. A comparison with incompressible and elastically compressible filter cakes showed a significant difference in the filtration behavior. Due to plastic deformation, a strong increase of the packing density when nearing the filtration membrane was found, leading to higher flow resistance for the filtration process. For cyclic filtration events, only the plastically deformed cake showed reduced height recovery in a relaxed state.     

空气过滤用电纺聚偏氟乙烯-聚丙烯腈/熔喷聚丙烯无纺布复合材料的制备及过滤性能

为开发高效低阻的空气过滤材料,采用静电纺丝技术制备了聚偏氟乙烯（PVDF）-聚丙烯腈（PAN）复合纳米纤维,并与聚丙烯熔喷非织造布复合制得高效复合过滤材料,研究了PVDF与PAN的质量比对溶液性质、表面形貌、比表面积、透气性和过滤性能的影响。结果表明,当PVDF与PAN质量比为3:5时,其溶液可纺性最好,所得纤维直径均匀,约为0.59 μm;利用BET比表面积分析仪测试可得其比表面积约为PVDF与PAN质量比为2:1时的两倍;利用滤料测试仪对PVDF-PAN/熔喷聚丙烯（PP）无纺布复合滤材的过滤性能进行测试,结果表明,静电纺PVDF-PAN纳米纤维层可显著提高聚丙烯熔喷非织造布的过滤性能,PVDF-PAN/熔喷PP无纺布过滤效率可达99.95%,明显高于熔喷无纺布的过滤效率（65%）,过滤阻力为77 mmH₂O（1 mmH₂O=9.8 Pa）,过滤品质因子达0.0987,远高于熔喷无纺布的过滤品质因子0.0168,过滤效果得到显著提升。      

PRELIMINARY PERFORMANCE TESTS OF A PULSED JET PLEATED PAPER CARTRIDGE FILTER SYSTEM

A pulsed jet pleated paper cartridge filter system was tested for particle removal efficiency and operating stability using agricultural limestone as the test dust. The test system consisted of 6 pleated paper filter units arranged in parallel, each unit having an effective filtration area of 18.1 square meters. The system was operated at constant pressure drops of 6.25, 7.50 and 8.75 kPa (2.5, 3.0 and 3.5 inches of water), with face velocities of 0.78 to 1.04 m/ min (2.5 to 3.4 feet per minute) and dust loadings ranging from 0.5 g/ m to 2.5 g/ m³. Penetration through the media appeared to be relatively independent of dust loading, and efficiencies were in the 99.95 + % range. Slightly lower efficiencies were found for particles having diameters of 0.3 to 1.0 micrometers. A measure of the redeposition of dust pulsed from the filter was required to describe the effects on the pulse rate caused by changes in system flow and pulsing set point. Increased redeposition was found to occur with increasing flow rate, causing an increase in the pulse rate required to maintain operation of the system at a pulsing set point. Overall, the reverse pulse jet pleated paper cartridge filter system displayed extremely high particle removal efficiency in a compact unit that operated with low differential pressure.     

Granular bed filtration of high temperature biomass gasification gas

High temperature cleaning of producer gas from biomass gasification has been investigated with a granular filter. Field tests were performed for several hours on a single filter element at about 550 °C. The results show cake filtration on the granular material and indicate good filtration of the biomass gasification producer gas. The relatively low pressure drop over the filter during filtration is comparable to those of bag filters. The granular filter can operate with high filtration velocities compared to bag filters and maintain high efficiency and a low residual pressure.     

在低温液体纯化中采用金属丝网过滤技术的可行性研究

以金属丝网过滤器为研究对象,在介绍金属丝网的结构特点和过滤机理的基础上,论证了采用该种新技术获得超高纯低温液体的可行性.以太空条件下的液氦纯化为例,详细介绍了采用金属丝网过滤技术的液氦纯化系统,提出了过滤及再生方案,探讨了各过滤参数对过滤效率的影响,为进一步的试验论证提供参考.     

Increase in processing flue gas flow rate while maintaining the fluidization state and filtration performance in a low-temperature continuous regeneration filter using a fluidized bed

To increase the processing gas flow rate in a fluidized bed filter, the effects of superficial velocity and fluidization state on PM filtration and combustion were examined by experiments using large bed particles (710 μm). The fluidization state at 710 μm was measured by image analysis and recurrence plot, and the superficial velocities as experimental conditions were determined to obtain almost the same fluidization state and filtration efficiency as those for small bed particles (420 μm) in previous studies. The BET-surface area of 710 μm is slightly larger than that of 420 μm, and the amount of potassium catalyst doped on large bed particles is comparable to that at 420 μm. The gas phase velocity is increased by increasing the processing gas flow rate, and the contact probability between PM and oxidizer increases. The PM combustion reaction is significantly promoted owing to the effects of the potassium catalyst and the increase in the gas phase velocity, and the minimum continuous regeneration temperature is 30 °C lower than that at 420 μm. As a result, fluidized bed filters using large bed particles can be operated in continuous regeneration mode at a bed temperature of 320 °C while maintaining a filtration efficiency of 100%.     

高温烟尘陶瓷纤维过滤技术特性及其应用评述

在综述国外用于高温烟尘净化的几种主要陶瓷纤维滤料和高温陶瓷过滤器结构性能及其发展现状基础上,提出了比表面积大、净化效率高、过滤阻力低、初始投资低和运行较可靠的蜂窝覆膜陶瓷过滤器的选型择优建议;通过对陶瓷过滤器的应用评述,并结合我国对节能减排的客观需要,说明了在我国尽快发展用于高温烟尘净化的陶瓷纤维过滤技术的必要性。