摘要:
研究了工艺参数对烧结燃料NOx排放浓度的影响规律。研究结果表明:随着烧结温度的升高,烧结燃料NOx的平均浓度先升高后降低,当烧结温度在1 100℃左右时,氮氧化物的平均浓度达到最大值。随着高温恒温时间的延长和升温速率的增大,烧结燃料NOx的平均浓度均出现降低趋势,分别由87 mg/m3和91 mg/m3降低到77 mg/m3和80 mg/m3。在氧含量低于21%时,NOx的平均浓度随着氧含量的升高而升高。NOx的排放浓度主要取决于烧结生产中氮氧化物的生成及被还原程度。因此,烧结生产中可通过控制烧结温度、增大升温速率、延长高温时间或降低含氧量等方式抑制NOx的生成或促进其还原,进而降低烧结烟气中NOx的排放量。
关键词:
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烧结 /
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燃料 /
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氮氧化物 /
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排放浓度 /
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工艺参数 /
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配矿
Abstract:
Effects of processing parameters on emission concentration of the fuel NOx in the sintering process were investigated using tube furnace.The results show that the average concentration of fuel NOx increases first and then decreases with increasing the sintering temperature,reaching a maximum with the sintering temperature approximately at 1 100 ℃.As the holding time of high temperature and heating rate increase,the average concentration of fuel NOx decreases from 87 mg/m3 and 91 mg/m3 to 77 mg/m3 and 80 mg/m3,respectively.When the oxygen content is lower than 21%,the average concentration of fuel NOx has positive correlations with the oxygen content in the sintering process.The emission concentration of fuel NOx mainly depends on the formation and reduction of NOx in sintering process.Therefore,in the sintering process,the formation of NOx can be inhibited or reduced by controlling sintering temperature,increasing heating rate,prolonging high temperature time or decreasing oxygen content,then the discharge amount of NOx in the sintering flue gas can be reduced.
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