褐煤O2/CO2燃烧时可吸入颗粒物中碱性金属分布特性  

DISTRIBUTIONS OF BASIC METAL ELEMENTS IN INHALABLE PARTICULATE MATTER DURING O_2/CO_2 COMBUSTION OF LIGNITE

作　　者：王超[1] 盛昌栋[1] 周科[2] 于敦喜[2] 姚洪[2] 徐明厚[2] 

机构地区：[1]东南大学能源与环境学院,江苏南京210096 [2]华中科技大学煤燃烧国家重点实验室,湖北武汉430074

出　　处：《工程热物理学报》2009年第7期1241-1244,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.50576012;No 50721140649);新世纪优秀人才支持计划(No.NCET-06-0468)

摘　　要：通过沉降炉燃烧实验,研究了褐煤O_2/CO_2燃烧时可吸入颗粒物的生成和碱性金属元素在颗粒物中的分布特性。结果表明,燃烧气氛由O_2/N_2燃烧转变为O_2/CO_2燃烧时,亚微米颗粒物的生成量减少,但超细颗粒量增加。气氛对碱性金属元素分布的影响主要体现在亚微米颗粒范围内。与O_2/N_2燃烧相比,相同氧浓度下O_2/CO_2燃烧时所生成亚微米颗粒物中碱性金属向小粒径颗粒中富集。O_2/CO_2气氛下,低氧浓度燃烧时碱性金属元素对亚微米颗粒物的生成贡献大,而增加氧浓度其在亚微米颗粒物中质量份额则减小。The formation of inhalable particlate matter and the distributions of basic metals in the particles during O2/CO2 combustion of pulverized lignite were studied through combustion experiments in a drop tube furnace. It was indicated that changing the combustion atmosphere from O2/N2 to O2/CO2 led to less submicron particles but more finer particles formed. The impact of combustion atmosphere on the distributions of basic metals was observed mainly in the submicron size range. Compared with those in O2/N2 combustion, basic metals were more enriched in the finer submicron particles formed in O2/CO2 combustion at a same oxygen concentration. During O2/CO2 combustion, basic metals made a greater contribution in submicron particle formation at lower O2 concentration while increasing O2 concentration resulted in tile decrease in the mass fractions of basic metals in the submicron particles.

关 键 词：褐煤 O2/CO2燃烧 碱性金属元素 可吸入颗粒物 

分 类 号：TQ038.2[化学工程]