Fe_2O_3和K_2CO_3对高灰分煤催化燃烧影响及机理分析
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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.
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.
引文
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[2]Kim Y K,Hao L F,Park J I,et al.Catalytic activity and activation mechansim of potassium carbonate supported on perovskite oxide for coal char combustion[J].Fuel,2012,94:516-522.
[3]马保国,徐立,李相国.碱/碱土金属对高灰分煤粉燃烧的催化作用[J].煤炭科学技术,2007,35(9):69-72.
[4]张辉,邹念东,刘应书.添加剂对煤粉燃烧过程活化能变化规律的影响[J].煤炭学报,2013,38(3):461-465.
[5]Zhao Y,Wang S Q,Shen Y M.Effects of nano-Ti O2on combustion and desulfurization[J].Energy,2013,56:25-30.
[6]Marisamy M,Tomoaki N,Kunio Y Y.A comparison of Co-combustion characteristics of coal with wood and hydrothermally treated municipal solid waste[J].Bioresource Technology,2010,101:2477-2482.
[7]王东平,贾宏禄,刘小平.利港电厂2×350 MW机组锅炉低氮燃烧改造及对锅炉运行的影响[J].热力发电,2008,37(12):38-44.
[8]Li X G,Ma B G.Thermogravimetric analysis of the Co-combusition of the blends with high ash coal and waste tyres[J].Thermochimica,2006,411:79-83
[9]Li X G.Thermogravimetric investigation on Co-combustion characteristics of tobacco residue and hig H-ash anthracite coal[J].Bioresource Technology,2011,102:9783-9787.
[10]公旭中,郭占成,王志.Ca-Fe-Ce系催化剂对无烟煤燃烧的影响[J].燃料化学学报,2009,37(4):421-426
[11]刘金刚,程云飞,王延庆.过渡金属硫酸盐对煤粉燃烧的催化作用[J].煤炭转化,2009,32(1):65-67
[12]Gong X Z,Gou Z C,Wang Z.Reactivity of pulverized coals during combustion catalyzed by Ce O2and Fe2O3[J].Combustion and Flame,2010,157:351-356.
[13]谢峻林,何峰.水泥窑用无烟煤的催化燃烧[J].硅酸盐学报,1998,26(6):792-795.
[14]杨燕.燃煤催化剂的作用机理及对比研究[J].科技情报开发与经济,2007,17(8):137-138.
[15]徐谷衡,蒋君衍,张鹤声.煤催化着火机理[J].同济大学学报,1993,,21(3):415-421.
[16]王培铭,许乾慰.材料研究方法[M].北京:科学出版社,2011,270-271.
[17]徐立.水泥工业劣质煤活化燃烧及机理研究[D].武汉:武汉理工大学硕士学位论文,2007.
[18]贺鑫杰,张建良,祁成林,等.催化剂对煤粉燃烧特性的影响及动力学研究[J].钢铁,2012,47(7):74-79.
[19]杨景标,蔡宁生,应用TG-FTIR联用研究催化剂对煤热解的影响[J].燃料化学学报,2006,34(6):650-654.
[20]白亚楠,张建良,苏步新,等.Fe2O3催化煤粉燃烧的动力学[J].钢铁研究学报,2013,25(6):8-12.
[21]公旭中,郭占成,王志.Fe2O3催化无烟煤燃烧燃点降低机理的实验研究[J].化工学报,2009,60(7):1707-1713.
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