中文摘要：

对细粉半焦预热燃烧过程中氮元素的释放与颗粒特性的变化关系进行了实验研究，实验中预热温度为900℃，燃烧温度为1050℃。结果表明预热过程中，半焦颗粒比表面积和孔径与氮元素的释放有密切关系。一次风当量比如FB较大时，半焦颗粒的比表面积与孔径也较大，促进了氮元素的释放。燃烧过程中，在二次风与三次风之间区域，颗粒比表面积和含氮官能团峰值均迅速降低，表明颗粒在这段区域燃烧剧烈，同时氮元素大量释放，因此合理控制二次风与三次风之间区域的氮元素释放及转化可以有效的控制燃烧过程中NOx生成。实验结果表明增加二次风与三次风之间区域的还原强度，可以有效的降低燃烧过程中NOx生成，在保证二次风与三次风之间还原强度不变的条件下，三次风的配风对NOx的影响很小，因此二次风与三次风之间区域的氮元素释放对燃烧过程中NOx生成有重要影响。

英文摘要：

The relationship between the release of nitrogen and the particle properties in fine char during preheating and combustion was studied experimentally. The preheated temperature is 900 ℃, the combustion temperature of 1050℃. The results show that in the preheating process the release of nitrogen is closely related to the specific surface area and pore size of char particle. When the equivalence ratio of primary air CFB is larger, the specific surface area and pore size of char particle also is larger, promoting the release of nitrogen. In the combustion process, the specific surface area of particles and the peak of nitrogen functional group are rapidly reduced in a region between the secondary air and tertiary air, indicating that the particles burnt vigorously in this region and a large amount of nitrogen released. Therefore the reasonable control of release and transformation of nitrogen in the region between the secondary air and tertiary air can effectively control the generation of NOx in the combustion process. Experimental results show increasing the reduction strength of the region between secondary air and tertiary air can effectively reduce the generation of NOx during the combustion process. And under the same condition of the reduction strength in the region between secondary air and tertiary air, the influence of changes in the tertiary air on NOx is very small. So the release of nitrogen in the region between secondary air and tertiary air has a major influence on the generation of NOx during the combustion process.