高温烟气除尘用新型高强耐蚀合金滤材的制备及性能研究

以?240 mm新型高强耐蚀合金铸锭为原料,经过开坯、拉拔、铺毡、烧结等工序制备出了金属滤材,系统研究了滤材的高温抗氧化性能、高温拉伸性能及过滤性能。结果表明:合金滤材在700℃为抗氧化级别,700℃以下具有良好的抗氧化性能;当温度由室温逐渐升高到650℃时,合金滤材的抗拉强度呈线性降低;合金伸长率在低于150℃时下降缓慢,150~450℃时下降迅速,而高于450℃时,伸长率下降趋势又显著减小;过滤风速为1.5 m/min及5.0 m/min时,新型高强耐蚀合金滤材对粒径大于0.5μm的粉尘的过滤效率均超过98%,出口粉尘浓度仅为0.5 mg/m~3,可完全满足冶金、化工、能源等领域对于大气污染物排放的标准。

Study on the preparation and properties of new high strength corrosion resistant alloy filter for high temperature flue gas dust removal

Through the process of cogging,drawing,carding and sintering,the new high-strength corrosion resis-tant alloy filter was prepared with ? 240 mm ingot as raw material. The high temperature oxidation resistance, high temperature tensile properties and filtration properties of the filter were systematiclly studied. Results show that the filter has good oxidation resistance at 700 ℃. When the temperature increases from room temperature to 650 ℃,the tensile strength of the alloy filter decreases linearly. Meanwhile,the elongation of the alloy decreases slowly when the temperature is lower than 150 ℃,and it decreases rapidly at 150-450 ℃,while it decreases slow-ly when the temperature is higher than 450 ℃. When the filtration velocity is 1.5 m/min and 5.0 m/min,the filtra-tion efficiency of the filter material for the particles with particle size larger than 0.5 μm is more than 98%. The out-let dust concentration is only 0.5 mg/m3,which completely meets the emission standards of air pollutants in the fields of metallurgy,chemical and energy.