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在有色火法冶炼中,烟气通过各种工艺管道向各工序延伸,最后经收尘排入大气。由于烟气中含有多种微量元素,特别是含有SO_2时,将严重腐蚀金属烟管内壁,大型烟管的维修与防护尤为重要,成为必须解决的课题。在一般情况下,当工艺烟管的烟气温度高于550℃、存露点温度以上运行时,腐蚀速率较缓慢,以A_3钢板烟管为例,其腐蚀深度每年平均约0.2～0.4毫米(一般采取增加腐蚀裕度的办法来稳定生产)。当烟气温
In the non-ferrous pyrometallurgy, flue gas is extended to all processes through various process pipelines and finally discharged into the atmosphere through dust collection. As the flue gas contains many kinds of trace elements, especially when containing SO2, it will seriously corrode the inner wall of the metal smoke pipe, and the maintenance and protection of the large smoke pipe are especially important and must be solved. Under normal circumstances, when the flue gas temperature of the process pipe is higher than 550 ℃ and the temperature above the dew point, the corrosion rate is relatively slow. Taking A_3 steel pipe as an example, the corrosion depth is about 0.2 ~ 0.4mm per year To increase the corrosion margin approach to stabilize production). When the smoke temperature