摘要
实验室条件下,将取样枪与8级Andersen粒子撞击器联用,分别在沉降炉内炉管的100 cm、60 cm和45 cm处(代表不同的燃烧时间)采集煤粉燃烧后的一次颗粒物并做分析,研究燃烧时间对煤粉生成的一次颗粒物特性的影响.一次颗粒物的粒度分布表明,燃烧时间越长,生成的粒径较小的颗粒物的量越多.PMi的排放量随燃烧时间增长而增大.SEM结果显示燃烧时间短,颗粒物破碎程度较小.成分分析表明,特定煤粉在不同燃烧时间后生成的总灰中,主要组分的含量变化不大,且亚微米颗粒物的成分与超微米颗粒物成分不同.ICP-AES分析结果表明,Pb和Zn的蒸发过程受燃烧时间的影响较小,而Cu和Ni的蒸发受燃烧时间的影响较大,揭示了元素熔点与富集特性的规律.
A sampling probe, together with an 8-stage Andersen particle impactor, was employed to sample the primary particulate matter （PM） at different places in a laboratory-scale drop tube furnace during pulverized coal combustion, in order to study the primary PM features. According to the PM mass-size distribution, the longer the bunting time was, the more fine PM was produced. The amount of PMi emission increased with the lengthening of the burning time. SEM images showed that the shorter the burning time was, the less PM got broken. The component analysis showed that the main constituents in bulk ash remained almost unchanged after coal combustion at different time, and that the constituents of sub-micron PM were not the same as ultra-micron PM. The results of ICP-AES showed that burning time had little effect on the vaporization of trace elements such as Pb and Zn, but a greater effect on the vaporization of copper and nickel, which posted the ride between element melting point and enrichment feature.
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
2008年第1期55-60,共6页
Journal of Combustion Science and Technology
基金
国家重点基础研究发展计划(973)资助项目(2002CB211600)
北京化工大学纳米材料先进制备技术与应用科学教育部重点实验室开放课题资助项目(2006-2)
华北电力大学博士学位教师科研基金资助项目(200712007)
关键词
煤粉燃烧
一次颗粒物
排放特性
痕量元素
富集特性
pulverized coal combustion
primary particulate matter
emission features
trace element
enrichment feature
