O3氧化-湿式镁法同步脱除烧结烟气中NOx和SO2的中试研究

为了探究烧结烟气O₃镁法吸收技术的实际应用情况,对模拟烧结烟气开展O₃氧化镁法吸收技术的中试研究。采用中晶中试试验平台研究验证O₃氧化镁法吸收技术的脱硫脱硝超低排放路线,研究表明:在烟气量为1000 m3/h,ρ(SO₂)为1500 mg/m3,ρ(NO)为280 mg/m3,烟温为130 ℃的条件下,将n(O₃)∶n(NO)控制在1.5∶1以上时,NO氧化效率可稳定达到100%,系统整体NO_x脱除率可达到90%,出口的ρ(NO_x)可维持在20~35 mg/m3。研究结果表明,中试条件下O₃氧化镁法吸收技术应用于烧结烟气脱硫脱硝满足钢铁行业对硫氧化物和NO_x的超低排放标准。

PILOT-SCALE TEST ON REMOVAL OF NOx AND SO2 FROM SINTERING FLUE GAS BY OZONE OXIDATION COMBINED WITH MAGNESIUM WET ABSORPTION

In order to explore the practical application of sintering flue gas purification technology of ozone oxidation combined with magnesium wet absorption, a pilot study on simulated sintering flue gas was carried out. The ultra-low emission route of desulfuration and denitrification by MgO absorption technology was studied and verified by a pilot scale test platform. The results showed that, flue gas volume of 1000 m3/h, SO₂ concentration of 1500 mg/m3, NO concentration of 280 mg/m3, smoke temperature of 130 ℃ and n(O₃)∶n(NO) above 1.5∶1, the NO oxidation efficiency could reach 100%, the total NO_x removal rate of the system reached 90%, and the NO_x concentration at the outlet could be maintained in 20~35 mg/m3. The results showed that the application of ozone oxidation-MgO absorption technology in desulfurization and denitrification of sintering flue gas could meet the ultra-low emission standards of sulfur oxides and nitrogen oxides in the iron and steel industry.