Catalytic Effects of Main Metals in Coal Ash on Advanced Reburning of Pulverized Coal
Catalytic Effects of Main Metals in Coal Ash on Advanced Reburning of Pulverized Coal
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DOI：
10.1021/ef100658m
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发表时间：
2010-08
期刊：
影响因子：
5.3
通讯作者：
Penghua Qiu;Hui Huang;Jianqiang Zhang;Li Liu;Yuqing Chen
中科院分区：
文献类型：
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作者：
Penghua Qiu;Hui Huang;Jianqiang Zhang;Li Liu;Yuqing Chen
为进一步降低火电厂NOx排放，在两级滴流式反应器（TSDFR）中对原煤和煤灰中添加Na、K、Fe、Ca 4种主要金属元素的再燃燃料进行了再燃NO还原试验研究。结果表明，煤灰中的金属元素对再燃过程中NO的还原有不同程度的影响，影响程度取决于进入再燃区烟气中氧气的体积分数（OFO）。当OFO含量为2.75 ~ 5.36%时，NaOH和KOH对NO还原有明显的催化作用，使NO还原效率明显提高，而FeCl 3和Ca（OH）2的催化作用较弱。通过比较原煤和添加不同金属的煤作为再燃燃料时5种主要产物的转化率，发现某些类型的金属可以通过提高再燃过程中NO的还原率来提高再燃过程中NO的还原率。
To further reduce the NOx emission from power plants, an experimental study on the NO reduction during advanced reburning with reburning fuel of raw coal and coals loaded with four kinds of main metals in coal ash (Na, K, Fe, Ca) was performed in a two-staged drop flow reactor (TSDFR). The results show that the metals in coal ash can affect the NO reduction during advanced reburning to different degrees, depending on the original fraction of oxygen (OFO, the volumetric concentration of oxygen in the flue gas which is entering into the reburning zone). When the OFO is between 2.75 and 5.36%, NaOH and KOH have a significant catalytic effect on NO reduction, producing an obvious increase in NO reduction efficiency, whereas the catalysis of FeCl3 and Ca(OH)2 is weak. By comparing the conversion of five main products during the reactions when using raw coal and coals loaded with different metals as reburning fuel, it is found that some types of metals can improve the NO reduction in reburning via increasing th...