煤焦反应活性影响因素的探讨  

DISCUSSION ON THE EFFECT OF HEATING TREATMENT ON THE INTRINSIC REACTIVITY OF COAL-CHAR

作　　者：张守玉[1] 黎永[1] 吕俊复[1] 岳光溪[1] 王洋[2] 

机构地区：[1]清华大学热能工程研究所,北京博士后100084 [2]中国科学院山西煤炭科学研究所,太原研究员030001

出　　处：《煤炭转化》2003年第2期25-28,90,共5页Coal Conversion

基　　金：国家"十五"科技攻关项目 ( 2 0 0 1BA40 1A0 3);国家重大基础研究规划项目 ( G19990 2 2 2 0 4)

摘　　要：总结了前人在热处理对煤焦反应活性的影响方面的研究结果 ,并得到如下的结论 :热处理过程使得煤焦中碳结构排列有序化及具有催化能力的矿物质组分烧结或熔融 ,从而导致了煤焦反应活化能增加 ,反应活性下降 .煤焦反应活性可以用低温下其对氧的化学吸附量来表征 。The intrinsic reactivity of coal-char in the reaction of gasification or co-mbustion is discussed in the paper. According to the previous works, the authors believe that with the development of reaction, the quantity of the active sites of high reactivity becomes less and less, and thus the reaction rate of coal-char becomes lower and lower. At the same time, the reactivity of coal-char is also affected by the process of heating treatment during reaction. The arrangement of carbon structure within coal-char become more orderly because of heating treatment and thus the quantity of active sites become lower. Moreover, during the process of heating treatment, the effective catalyzing contents in the mineral of coal-char may be sintered or melted and the catalyzing performance is worse or lost. Consequently the activation energy of coal-char becomes higher and the reaction rate becomes lower. There is a good correlation between the active surface area (ASA) determined by low-temperature chemisorption of oxygen and the reactivity of coal-char. The reactivity of coal-char can be analyzed by distributed activation energy model (DAEM).

关 键 词：煤焦 反应活性 热处理 ASA DAEM 

分 类 号：TQ531[化学工程—煤化学工程]