New Environmentally Friendly High Temperature Composite Filter Media

With the development of technology and the enhancement of environmental protection consciousness, people pay more attention to high temperature gas flltration in the areas of metallurgical industry, power making, carbon black manufacture etal. At present needle nonwoven is the most widely used as air and gas flltration media for its three dimensions construction and high porosity and high flltration efficiency. So there is wide prospective market for needle nonwoven. High temperature resistant synthetic fiber is researched earlier abroad than in china. With the development of high temperature resistant synthetic fibers, more and more new kinds of flltration material made by these fibers are coming out. Hovvever, there is few high temperature resistant svnthetic fiber in China today. Then the high temperature gas flltration media are mainly used of glass fiber. Although the glass fiber is cheap, it's abrasion resistance and broken resistance are poor and it can't conform to demand of high temperature gas flltration completely. So the usage of glass fiber is limited. In a word, it is very important to import high performance and high temperature resistant synthetic fiber to produce high property and high temperature resistant filtration media.A new kind of high temperature resistant composite filtration media used for environmental protection is investigated in this paper. First, features of four imported high temperature resistant synthetic fibers, P84, Basofil, PPS and Conex are studied. The effect of heat treatment on the mechanical and chemical properties of these fibers is evaluated by differential thermal analysis and other methods. The influence of fiber's diameter and cross-section shape on the flltration property of the flltration media is also researched. Second, Six high temperature resistant filtration media blended with different ratio of P84 to Glass are measured. The main measurement items are listed below: tensile propertv, bursting strength, abrasion resistance, air permeability and flltration efficiency. The relationship betvveen using characteristics and blending ratio of blended filter are also investigated. Analysis of measured data indicates that tensile property, bursting strength, abrasion resistance and filtration efficiency are significantlyproportional to the blending ratio of two kinds of fibers; obvious regularity is not be found between air permeability and blending ratio. Additionally, regression model of relationship between each item of filter characteristics and the blending ratio is established. Thirdly, the effects of filter surface finishing technology on the properties of the filer media are also discussed. Based on the above study, the optimum produce process of the new high temperature resistant composite filtration medium is ascertained. According to the demand of usage it's necessary to adopt the optimum blending ratio?70/30(P84/Glass). The delamination structure and proper surface finishing processes are necessary. The benefit of the new kind of high temperature resistant composite filtration media is evaluated. Experiments show that this new industrial product has better social, economic and environmental value than traditional glass filtration media.