铁矿石烧结是目前一个重要的二(口恶)英(PCDD/Fs)产生工业源,烧结过程二(口恶)英的生成机理复杂,主要由前驱体化合物经有机化合反应生成和碳、氢、氧和氯等元素通过“从头合成”生成,其中以“从头合成”为主,二(口恶)英在烧结机上不仅在干燥带中产生,而且在燃烧带和烧结带的排烟道中也产生.烧结过程二(口恶)英的减排主要方法分为源头控制、过程与操作控制以及末端治理3种,源头控制是烧结过程抑制二(口恶)英产生的最佳选择,现行工艺往往选择末端治理.烧结烟气成分复杂,单一的二(口恶)英减排技术减排幅度未必奏效,而且投资比较大.针对烧结工序的技术特点和烧结烟气的特征,烧结污染物协同减排是烧结工序节能减排的最佳途径,如烧结烟气循环不但可以减少二(口恶)英产生,还可以同时减少NOx和粉尘量的排放,这是今后烧结协同减排发展的一个方向.
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