Research On Performance Of Thermostability Filter Material

Glass fiber filter material is dominating high temperature flue gas filter industryin our country currently. Because of its high strength, thermostability, corrosionresistance, smooth water-repellent, good dimensional stability, corrosion resistance,the abrasive resistance, pucker resisting can be improved after soaking treatmented, soit’s a kind of ideal filter material. During a lot of gas filtration, the temperature ishigher than200℃, such as carbon black, steel, cement, high-temperature coal-firedboilers, metallurgy, electric power, chemical industry etc, sometimes filtertemperature exceeds250℃, or even higher. On the other hand, compared to thethermostability synthetic fibers, such as Nomex, PPS, PTFE etc, the glass fiber ismore economical and more fireproof. If the glass fiber is made into needle felt usingnon-woven needle technics, the requirements can be greatly satisfied that pulse dustare filtered from high temperature gas.Sarted from studying the basic performances of thermostability filter materialand high silica glass fiber, the project systematically studies the glass fiber’scross-section shape, composition and mechanical properties. And mechanicalproperties, breaking elongation, elastic modulus, acid, alkali resistance,thermostability of high silica fiber yarn were tested. This project uses the fineness of1.67dtex, single fiber diameter of9μm high silica glass fiber offered by the Shaanxiprovincial Xingping city glass fiber plant.The subject uses SiO₂—B₂O₃—Na₂O ternary system high silica glass as rawmaterial, which be made to glass fiber through leakage crucible, and the glass fiber ispost-treatment by industrial hydrochloric acid, then through acid filtering, washingand drying, heat sintering, using SiO₂content as a rigid evaluation index, the singlefactor analyzing method is applied to analyze the effect of the acid concentration, theacid temperature, the draining time on the content SiO₂, and the optimal parameter ofacid leaching obtained is: hydrochloric acid12%, acid temperature96℃, leachingtime55min. In addition, on the condition of keeping high breaking strength and lowshrinkage of high silica needle felt, the thermal sintering process is carried out, and the different components of the glass fiber are analyzed. The result shows that there isa significant correlation between strength and sintering temperature and time. Inaddition, shrinkage is irrelevant to temperature, but is relative to glass composition,fabric structure and application. Sintering time is confirmed by strong loss.In order to produce the thermostability needle felt smoothly, the raw materiallength, fineness, folding, wear resistance, anti-static analysis, etc. are analyzed.During the process of needle punching, the configurations of needle punchingmachine, combing, web formation and needle cloth are introduced, and the processparameters of producing thermostability R glass fiber needle felt are optimizedthrough experiment.The performances of treated high-silica needle felt are tested, including thickness,unit weight, and tensile properties. Specific indexes are thermostability, airpermeability, water permeability, pore size, filter performance, and are compared withother filter materials. The result shows that high silica glass fibers have an excellentthermostability, high filter efficiency, and long life time especially in the superhightemperature gas, coal etc. industries.Finally, the main content of this subject research is concluded. The results showthat all the properties of R fiber fabrics meet the demands of thermostability dust filter.It has certain significance for the development of needle-punched nonwoven filterfabrics of high silica glass fiber with hight-temperature performance.