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科技导报  2014 

钢铁烧结烟气多污染物的排放特征及控制技术

DOI: 10.3981/j.issn.1000-7857.2014.33.006, PP. 51-56

Keywords: 钢铁工业,烧结烟气,污染物排放

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Abstract:

监测了钢铁烧结烟气的排放特征,发现SO2排放浓度沿着烧结机方向呈现机头和机尾低、中部高的特点,二噁英的排放浓度与烟气温度正相关,温度高于250℃时二噁英的排放浓度出现峰值.调研了数十台烧结机的烟气排放特征,表明SO2排放浓度≤2000mg/m3的占63%,要求脱硫效率大于90%;>2000mg/m3的占37%,要求脱硫效率大于96%.NOx排放浓度≤300mg/m3的占86%,烟气无需脱硝可直接排放;在300~600mg/m3之间的占14%,要求脱硝效率大于50%.二噁英排放浓度为1.0~5.0ngTEQ/m3,必须采取控制措施才能达标排放.针对烧结烟气SO2和二噁英浓度高的特点,论述了基于活性炭吸附的活性炭法,以钙基吸收剂脱硫为主、活性炭(焦)脱二噁英为辅的SDA法、MEROS法、IOCFB法等4种多污染物协同控制技术及脱除效果.

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