生物质燃烧源PM2.5在水汽条件下长大特性的研究

摘要

The growth characteristic of biomass-fired PM2. 5 with vapor condensation was studied. A growth tube was employed to investigate the growth performance of PM2. 5 at various temperatures of water, initial concentrations of particles, residence times and surfactants. The results show that the growth performance of PM2. 5 from biomass combustion is better than that of coal-fired PM2. 5 with vapor condensation. Furthermore, both the water temperature increase and the residence time delay benefit the growth of PM2. 5 . Unlike the growth of PM2. 5 from coal combustion, the growth of small size of particles is seldom affected by the initial particles concentration. However, with a certain amount of surfactant addition, the particles can all grow up to 1μm .%研究了生物质燃烧源产生的细颗粒在水汽条件下的长大特性，通过生长管实验研究了不同的热水温度、颗粒初始浓度、颗粒在生长管中的停留时间及表面活性剂下生物质燃烧源细颗粒在水汽过饱和条件中的长大特性。与燃煤细颗粒在水汽条件下的长大结果进行对比，生物质燃烧源细颗粒的长大效果要比燃煤细颗粒长大效果要好，热水温度的升高、停留时间的延长有利于细颗粒的长大，小粒径段颗粒的长大则几乎不受颗粒初始浓度的影响，添加一定量的表面活性剂可以使得生物质燃烧源细颗粒全部长大至1μm以上。