不同煤粉燃烧对一次颗粒物排放特性的影响

Emission Features of Primary Particulate Matters after Different Pulverized Coals Combustion

在实验室条件下,以沉降炉作为燃烧设备,用8级Andersen粒子撞击器分离并收集燃烧后的颗粒物,研究了3种煤粉燃烧后生成的一次颗粒物中可吸入颗粒物排放的特性.结果表明,煤粉燃烧后,PM10、PM2.5、PM1的排放量并不是煤中灰分、固定碳或挥发分的单一函数.用Rosin-Ramm ler函数对一次颗粒物的质量-粒径分布进行曲线拟合,并计算了其中PM2.5/PM10、PM1/PM2.5的值.结果显示,灰分较高的煤粉生成的PM2.5/PM10、PM1/PM2.5值较高,灰分含量低的煤粉生成的PM2.5/PM10、PM1/PM2.5值较低.但PM2.5/PM10、PM1/PM2.5的值与灰分含量并不成正相关性.分析认为,不同煤粉中组分形式和含量的不同,影响了煤粉燃烧后一次颗粒物形成的过程,造成一次颗粒物排放特性的不同.

Three different pulverized coals were combusted in a drop tube furnace and an 8-stage particle sizing impactor was used to separate and collect the primary particulate matter for investigating the emission features of inhalable particulate matter. It is shown that the emission amounts of PM10, PM2.5, PM1 after coal combustion were not a single function of the content of ash, fixed carbon, and volatile in coal. Rosin-Rammler function was adopted to simulate the particle size distribution, and the value of PM2.5/PM10, PM1/PM2.5 were also calculated by the simulating Rosin-Rammler function. It is tound that the more the ash content in coal was, the greater the value of PM2.5/PM10 and PM1/PM2.5 were, but the value of PM2.5/PM10 and PM1/PM2.5 were not in positive correlation to the ash content. So it was believed that the different emission features were influenced by the different formation processes resulted from discrepancy of different kinds of coal.