煤中添加 NH4 Br 对气相汞氧化脱除及脱硝的实验研究

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为脱除烟气中的气相汞和 NOx,进行了贵州无烟煤中添加 NH4 Br 对烟气汞氧化脱除协同脱硝的实验研究.在热重分析仪上研究添加 NH4 Br 对着火温度和燃烧特性的影响.在6 kW 流化床燃烧(FBC)试验装置上研究了在煤中不同 NH4 Br 添加量对气相汞氧化脱除的影响.采用安大略法(OHM)对烟气中汞形态浓度进行了测定并得出汞质量平衡.结果表明,添加 NH4 Br 对贵州无烟煤的着火温度没有影响.原煤燃烧汞质量平衡率为95.47%,颗粒汞 Hgp、气态 Hg0和 Hg2+比例分别为75.28%,11.60%,13.12%.由于飞灰中含有较高的未燃尽碳,烟气中 Hgp 浓度较高.随着 NH4 Br 添加量从0增加至0.3%,烟气中气态 Hg0和 Hg2+减少,Hgp 相应增加.Hg0的氧化率与煤中 Br 的添加量成正相关.这表明煤燃烧中添加 NH4 Br 可促进 Hg0的氧化和脱除.烟气中 NOx 随着 NH4 Br 的添加呈减小趋势,其脱除率在0.3%添加量时达最大(17.31%).添加 NH4 Br 同时具有协同脱硝的作用.
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