燃烧过程中铅颗粒粒径分布的实验研究

Experimental study on particle size distributions of lead particulate matters during combustion

使用高3.4 m、内径0.15 m的一维炉实验台,对燃烧中铅颗粒的粒径分布进行实验研究.铅元素以醋酸铅溶液的形式通过空气雾化引入到燃烧液化石油气的炉膛中.使用切割粒径从0.48～12.63 μm的8级Andersen撞击器和切割粒径从0.030～10.0 μm的12级静电低压撞击器（ELPI）进行采样,同时对铅颗粒物的质量浓度粒径分布和数量浓度粒径分布进行了测量.使用场发射扫描电镜（FESEM）对铅颗粒微观形貌进行了观察.结果表明：在质量方面,铅颗粒主要集中在亚微米区间,质量浓度的峰值在0.2～0.6 μm之间;在数量方面,铅颗粒主要集中在0.03～0.4 μm区间,数量浓度的峰值在0.2～0.3 μm之间.

A 3.4 m tall, 0. 15 m inside diameter, one-dimension furnace was used to study the particle size distributions of lead particles during combustion. An aqueous solution of lead acetate was introduced into the furnace through a liquefied petroleum gas flame via air atomization. The mass distribution and number distribution were obtained using an 8-stage Andersen Impactor with aerodynamic cut-off diameters from 0. 48 to 12.63 μm and a 12-stage electrical low pressure impactor （ELPI） with aerodynamic cut-off diameters from 0. 03 to 10. 0 μm. The lead particle microstructures were analyzed using a field emission scanning electron microscope. The results indicate that for the mass concentration measurements, the majority of the lead particles are submicron particles, with a peak at 0. 2 - 0. 6 μm. For the number concentration measurements, the majority of the lead particles have sizes of 0. 03-0. 4 μm, with a peak at 0. 2 - 0. 3 μm.