工业硅冶炼烟气脱硫生产实践

Operation Practice of Desulfurization in Silicon Smelting Off-gas

为了使芒市永隆公司4条工业硅生产线的冶炼烟气排放满足现行国家及地方大气污染物排放标准,基于硅冶炼工艺,采用石灰石-石膏工艺进行脱硫改造。脱硫系统核心是SO_(2)吸收系统、石灰石浆液制备和储存系统、石膏脱水系统。对比了脱硫前后烟气参数,结果表明,尾气SO_(2)和NO_(x)排放浓度均小于150 mg/Nm^(3),优于重点区域污染物排放要求;粉尘排放浓度小于50 mg/Nm^(3),达到国家及地方污染排放标准要求。

In order to make the smelting flue gas emissions of the four industrial silicon production lines in Yonglong Company of Mangshi meet the current national and local air pollutant emission standards,based on the silicon smelting process,the limestone-gypsum process was used for desulfurization transformation.The cores of desulfurization system were SO_(2) absorption system,the limestone slurry preparation and storage system,and the gypsum dehydration system.The flue gas parameters before and after desulfurization were compared.The results showed that the concentration of SO_(2) and NOx in exhaust gas was less than 150 mg/Nm^(3),which was better than the emission requirements of pollutants in key areas.The dust emission was less than 50 mg/Nm^(3),which meet the national and local pollution emission standards.