元素钾、硅和铝在PM_(10)的形态与分布研究  

RESEARCH ON THE MORPHOLOGY AND DISTRIBUTION OF K, Si AND Al IN PM_(10) DURING COAL COMBUSTION

作　　者：刘小伟[1] 徐明厚[1] 于敦喜[1] 郝炜[1] 隋建才[1] 俞云[1] 

机构地区：[1]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》2006年第5期887-890,共4页Journal of Engineering Thermophysics

基　　金：国家重点基础研究专项经费资助(No.2002CB211602);国家自然科学基金资助项目(No.50325621)

摘　　要：通过对平顶山烟煤在沉降炉内的燃烧试验,结合热力学平衡计算分析,研究了三种选定的矿物质成灰元素钾、硅和铝在可吸入颗粒物中的形态与分布。燃烧试验条件为:煤粉粒径小于63μm,燃烧温度在1400℃,炉内燃烧气氛为空气气氛。试验采用低压撞击器(LPI)按不同粒径大小从0．03-10μm共分为13级,分别采集燃烧后的可吸入颗粒物。并采用热力学平衡计算分析方法研究了氧化性气氛中元素钾、硅和铝的化学形态和物理相。试验和计算结果显示:钾元素主要以K单质的形式气化,大部分以K2SO4、KCl、K2HPO4的形式存在于亚微米颗粒中,极少量以KAlSi2O6相存在于PM1．0-10中;极少量Si和Al元素分别以SiO和OAlOH及AlOH的形式气化,以固相SiO2和Al2O3存在于亚微米颗粒中,而大部分则以SiO2和Al6Si2O13的形式存在于PM1．0-10中。The chemical morphology and distributions of K, Si and Al in inhalable particulate matter during coal combustion are studied based on the experiments in a drop tube furnace and the chemical thermodynamic equilibrium analysis. Experimental conditions are selected as： coal particle size is smaller than 63 μm; reaction temperature is 1400℃. PM is collected with a Low-Pressure-Impactor （LPI） for a size-segregated collection. LPI used here is composed of 13 stages having aerodynamic cut-off diameter ranging from 10.0 to 0.03 μm. The chemical morphology and physical phase of K, Si and Al are investigated under the oxidizing atmosphere. The experimental and calculation results indicate that, a majority of K vaporize in form of K gaseous. In the PM1.0, the major K solid species are of K2SO4, KC1, K2HPO4; while in the PM1.0-10, the major K solid species are KAlSi2O6. A litter of Si and A1 vaporize and form gaseous SiO and OAlOH, AlOH respectively. In the PM1.0, the Si and Al solid species are SiO2 and Al2O3, while in the PM1.0-10, the major solid species are SiO2 and Al6Si2013.

关 键 词：燃煤 颗粒物 元素 形态与分布 

分 类 号：TK16[动力工程及工程热物理—热能工程]