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通过烧结杯实验,探究铁矿烧结过程中SO2的生成及排放特性,并基于SO2排放特性提出了在过湿层内添加尿素颗粒与烧结过程同步脱硫的新方法.结果表明,铁矿烧结过程前期生成的SO2被料层内水分吸收并积聚在过湿层内,烟气中的SO2浓度稳定在较低水平;当过湿层被高温烟气干燥完成并开始消失时,被水分吸收的SO2会大量、迅速地释放,与尿素脱硫剂快速反应生成硫酸铵超细颗粒,并通过除尘捕获,既不进入烧结矿,也不随烟气排向大气.工业试验表明,该方法可将SO2排放浓度从基准期时694.2 mg/m3降低至108.0 mg/m3,脱硫率为84.4%.另外,该工艺与现有脱硫工艺相比,具有投资成本低、脱硫过程简单等优点.
Through sintering cup experiments, the formation and emission characteristics of SO2 in the process of iron ore sintering were probed into, and a new method for simultaneous desulfurization of urea particles in the over-wetting layer and sintering process was put forward based on the characteristics of SO2 emission.The results show that the pre- The generated SO2 is absorbed by the moisture in the material layer and accumulates in the wet layer, and the SO2 concentration in the flue gas is stable at a low level. When the wet layer is dried by the high-temperature flue gas and begins to disappear, the SO2 Large amount and rapid release, with urea desulfurizer rapid reaction of ammonium sulfate ultrafine particles, and capture by dust, neither into the sinter, nor with the flue gas to the atmosphere.Experimental tests show that this method can SO2 emission concentration from Compared with the existing desulphurization process, this process has the advantages of low investment cost and simple desulphurization process with 694.2 mg / m3 reduced to 108.0 mg / m3 during the reference period and the desulphurization rate is 84.4%.