煤中矿物质对煤焦氧化的催化性能在热处理过程中的变化  

Transition of the Catalytic Capability of Minerals for the Oxidation of Coal-Char During Heat Treatment

作　　者：张守玉[1] 吕俊复[1] 黎永[1] 岳光溪[1] 

机构地区：[1]清华大学热能工程系

出　　处：《燃烧科学与技术》2005年第2期137-141,共5页Journal of Combustion Science and Technology

基　　金：国家重大基础研究规划资助项目(G200026309);国家十五科技攻关资助项目(2001BA401A03).

摘　　要：利用热天平和XRD,考察了蔚县煤和湔江煤镜质组中矿物质在热处理过程中对由其生成的焦反应性的影响.在温度较低时,热处理对焦中的碳结构、矿物质的催化性能影响很小;随着热处理温度的增加,矿物质将逐渐失去催化活性,碳结构则趋于有序化,导致焦反应性的下降.煤种不同,矿物质在煤中的组成及存在形式不同,使其在生成焦中的分布形式及存在状态的不同,对焦反应的催化能力也不同.热处理导致煤焦中碳微观结构的有序化和矿物质催化能力下降,是热处理过程中煤焦反应活性下降的两个主要原因.The effect of heat treatment on the catalytic capability of minerals for the oxidation of coal-char prepared from the vitrinite of YX coal and JJ coal was investigated using XRD and TGA. The effect of heat treatment on the carbon structure and the catalytic capability of minerals in coal-char are weak under low heat treatment temperature. With the increase of heat treatment temperature, the catalytic capability of minerals decreases and vanishes at last when the temperature is high enough; meanwhile, the crystalline of coal-char grows. Thus, the reactivity of coal-char decreases. The distribution and existence form of minerals in different coal are different as well as the catalytic capability of minerals. The decrease of the catalytic capability of minerals and the growth of the crystalline in coal-char caused by heat treatment are the main reasons for the deactivation of coal-char during combustion.

关 键 词：煤焦 反应性 矿物质 热处理 

分 类 号：TQ53[化学工程—煤化学工程]