Fe_2O_3和K_2CO_3对高灰分煤催化燃烧影响及机理分析  

Effect of Fe_2O_3 and K_2CO_3 on Combustion and Catalytic Mechanism Analysis of High Ash Coal from Huaibei Mining Area

作　　者：徐建[1] 章祥林[1,2] 靳廷甲 

机构地区：[1]安徽建筑大学材料与化学工程学院,合肥230601 [2]国家煤及煤化工产品质量监督检测中心(合肥检测室),合肥230022

出　　处：《硅酸盐通报》2016年第6期1841-1846,共6页Bulletin of the Chinese Ceramic Society

基　　金：安徽省科技厅科技攻关项目(12010402109)

摘　　要：为提高淮北矿区高灰分煤的燃烧效率,采用热重分析实验对比分析了Fe_2O_3和K2CO3对煤粉着火与燃尽温度、燃烧特性指数、放热面积的影响。结果发现Fe_2O_3和K2CO3可分别将煤粉的着火温度由480.3℃降低470.4℃和397.3℃,燃尽温度由628.4℃降到609.7℃和547.7℃,燃烧特性指数提高,放热量增大。利用SEM、XRD和FTIR测试技术对煤粉燃烧残余物的微观结构、物相组成及官能团变化进行研究,分析燃煤催化剂在燃烧反应中的作用机理;通过BET方程计算燃烧煤焦的比表面积,分析其孔隙结构的变化。结果表明Fe_2O_3和K2CO3的主要作用机理是促进燃烧反应过程中挥发分的析出,增强煤粉的吸附性能,加快燃烧反应过程中固定碳的燃烧。In order to improve the combustion efficiency of high ash coal from Huaibei mining area,the influence of Fe_2O_3 and K_2CO_3on ignition temperature,combustion characteristics and area of heat liberation is investigated by thermogravimetry analysis.The results show that Fe_2O_3 and K_2CO_3can reduce the ignition temperature from 480.3 ℃ to 470.4 ℃ and 397.3 ℃,the complete burning temperature is lowed from 628.4 ℃ to 609.7 ℃ and 547.7 ℃,the combustion characteristics index and the quantity of heat releasing are improved during the combustion.The microstructure,phase composition and the change of function groups of leavings of coal combustion are studied by XRD and FTIR for the catalytic mechanism analysis;BET equation is used for the calculation of specific surface area of char,analysis the change of pore structure.The results indicate that the catalysis mechanism of Fe_2O_3 and K_2CO_3is to promote the emission of volatiles,enhance coal ＇s adsorption capacity and speed up the fixed carbon combustion rate.

关 键 词：高灰分煤 燃烧性能 催化机理 物相组成 比表面积 

分 类 号：O643[理学—物理化学] TD984[理学—化学]