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《Journal of Zhejiang University(Engineering Science)》 2007-03
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Experimental study on NOx formation and reduction by Shenhua coal during combustion and reburning

ZHOU Jun-hu,LIU Guang-yi,LIU Hai-feng,WANG Zhi-hua,WEI Lin-sheng,ZHANG Yan-wei,CEN Ke-fa(Institute of Thermal Power Engineering,State Key Labortory of Clean Energy Utilization, Zhejiang University,Hangzhou 310027,China)  
To understand the NOx reduction mechanism of Shenhua coal during reburning process,the dynamic releasing and reduction characteristics of NOx by combustion and reburning at different oxygen volume fraction were investigated.The experiments were conducted on an electrically heated fix bed reactor equipped with online flue gas analyzer.Results show that the formation of NOx has bimodal distribution of volatile NOx and char NOx during combustion.The amounts of NOx keep near-linearly increasing with the increasing oxygen volume fraction at 0%~18%.The NOx amount formed at oxygen volume fraction of 15% is nearly 11 times than that of 0%.The NOx profile during reburning process has two valleys including volatile's homogeneous reduction process and char's heterogeneous reduction process.The homogeneous reduction process of volatile has greater effect than the heterogeneous process of char on the NOx reduction,and the homogeneous process is sensitive to the atmosphere change.When oxygen volume fraction is larger than 7%,the coal reburning process is ineffective for NOx reduction.
【Fund】: 国家重点基础研究发展计划资助项目(2006CB200303);; 国家杰出青年科学基金资助项目(50525620)
【CateGory Index】: TK16
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