燃烧过程中焦炭的膨胀特性及其对颗粒物形成的影响

该文通过煤粉在沉降炉中的燃烧,研究燃烧过程中煤焦的膨胀特性及其对颗粒物形成的影响.焦炭由煤粉在氮气气氛下脱挥发分而得到,通过分析焦炭颗粒的形态和粒径分布来研究其膨胀特性.文中着重研究了焦炭颗粒形成的超微米细微颗粒物.研究结果表明：初始煤粒粒径对超微米颗粒物的影响最明显,煤颗粒越小,生成的超微米颗粒物越多;温度对超微米颗粒物的影响随反应气氛的不同而有所不同;气氛对超微米颗粒物的影响也比较显著,氧气浓度的增加会导致更多的超微米颗粒物的形成.

SWELLING CHARACTERISTIC OF CHAR PARTICLES AND ITS INFLUENCE ON PM FORMATION DURING COMBUSTION

Pulverized coals were burnt in a laboratory-scale drop tube furnace to study the swelling characteristic of char particles and its influence on emission of particulate matter (PM) during combustion. Char particles were obtained from the furnace under different temperature in N2 environment. The morphology and particle size distribution of char particles were analyzed to study the swelling characteristic. We focus the emphasis on the formation of supermicron-sized PM by char particles in this study. The results indicate that, coal particle size affects supermicron-sized PM emission significantly during combustion. Decreasing coal particle size leads to formation of more supermicron-sized PM. Temperature affects supermicron-sized PM emission differently with oxygen concentration. Increasing oxygen concentration also leads to formation of more supermicron-sized PM.