碱金属对焦炭燃烧过程中NOx释放的影响

通过对焦炭负载不同含量的碱金属化合物，采用水平管式炉进行焦炭燃烧试验，并测量烟气中NOx的体积分数。试验研究了碱金属对于焦炭燃烧过程中NOx释放的影响。结果表明，碱金属可以不同程度地降低焦炭燃烧过程中的NOx释放总量和焦炭N向NOx的转化率，试验采用的4种碱金属的催化作用效果依次为K2CO3>Na2CO3>KCl>NaCl；在1 200 ℃下，KCl，NaCl和K2CO3的最佳添加量为1%，Na2CO3为2%，其中1%的K2CO3可以使焦炭NOx释放总量降低47.4%，效果最显著；温度对碱金属的催化活性影响较大，会显著影响不同碱金属对于焦炭与NO异相还原反应的催化活性。

Influence of alkali metal on the evolution of NOx during coke combustion

Combustion of the coke samples loaded with alkali metal was carried out in an alundum tube fixed bed reactor，by measuring NOx emissions，the effects of alkali metal on NOx release curve and char-N conversion rate were discussed.The results show that the extent of the contact between additives and coke is：K2CO3>Na2CO3>KCl>NaCl；In 1 200 ℃，the optimum adding content of KCl，NaCl and K2CO3 is 1% respectively while Na 2CO3 is 2%.It is worth mentioning that the emission of total NOx decreases 47.4% approximately when 1% K2CO3 is loaded on coke sample.It is also found that the influence of combustion temperature on catalytic activity is significant，mainly on the heterogeneous reduction reaction with char-NO.