2011年我国颁布了GB13223-2011《火电厂大气污染物排放标准》，明确规定自2014年7月1日起，现有循环流化床锅炉（CFB）机组排放的烟气中NOx浓度不大于200 mg/m3，新建CFB机组不大于100 mg/m3。
   2014年印发的《煤电节能减排升级与改造行动计划（2014-2020年）》则要求和鼓励新建机组接近或达到燃气轮机组排放限值，即在基准氧含量6%条件下，烟尘、二氧化硫、氮氧化物排放浓度分别不高于10, 35, 50 mg/m3，实现燃煤发电机组的超低排放。
   目前，由于循环流化床锅炉的燃烧温度较低（通常在850~950°C范围内），通过适当优化运行工况，可以实现NOx排放浓度控制在300 mg/m3以内，但要满足现有环保标准，特别是超低排放标准，仍需要根据机组实际情况，对锅炉进行改造或者增加脱硝装置。在众多烟气脱硝技术中，选择性催化还原
   （Selective Catalytic Reduction, SCR）和选择性非催化还原（Selective Non-Catalytic Reduction，SNCR）是运用较为广泛的两种技术。针对CFB脱硝技术改造，可以遵循低氮燃烧—低氮燃烧+SNCR——低氮燃烧+SNCR+SCR的技术路线，当前一项无法满足排放要求时。
   在原有脱硝技术基础上进一步增加脱硝装置改造。其中，低氮燃烧改造属于炉内脱硝改造，通过采用优化的分级燃烧，实现低NOx排放；SNCR和SCR则属于典型的CFB锅炉烟气脱硝改造



YPP110A  YPP110A
YPP110A  YPP110A

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