再燃区水煤浆脱硝反应特性的试验研究

为了解水煤浆的再燃脱硝特性，于固定床反应器上，模拟再燃区反应环境，利用组成为O2=4%，CO2=16%，NOx= 400 mL/m3，平衡气Ar的模拟烟气，在反应温度900~1200℃，过量空气系数在0.7~1.1的范围内，研究了水煤浆的再燃脱硝表现和影响因素。试验发现，水煤浆的再燃脱硝能力是煤粉和水综合作用的结果；其脱硝效果与成浆煤种相关，随再燃区过量空气系数的增加而减弱，与再燃区温度成正比，与成浆煤粉粒径和煤浆浓度成反比。试验获得的最高水煤浆脱硝率为64%。优良的脱硝特性揭示水煤浆是一种优质的再燃燃料，具有广阔的再燃应用前景。

Experimental Investiagtion on NOx Reduction Performance of Coal Water Slurry in the Reburning Zone

The performance of coal water slurry (CWS) reburning for NOx emission control was investigated in a fixed bed reactor at excess air ratio 0.7~1.1 with simulating gas mixture consisting of 4%O2, 16%CO2, 400 mL·m-3 NOx and balance gas Ar at 900~1200℃. The results indicate that CWS is superior to its composition in regard to NOx reduction, and NOx reduction capability of the CWS is a result of the integrated performance of water and coal particles. The NOx reduction ratio of CWS is closely correlated with parent coal rank, and has an inversely proportional relationship to the reburning zone excess air ratio, particle size and concentration. Higher temperature in reburning zone benefits NOx reduction. The maximum NOx reduction ratio of CWS obtained in this study was 64%. The CWS is a more effective reburning fuel and has wide prospects of application.