基于燃烧特性研究的回转窑混煤配比优化  

Optimization of the Blended Coal Proportion within Rotary Kiln Based on the Combustion Characteristic Research

作　　者：徐顺生[1,2] 石永彬[1] 黄日升[1] 张丽娜[1] 

机构地区：[1]湘潭大学机械工程学院,湘潭411105 [2]中南大学能源科学与工程学院,长沙410083

出　　处：《硅酸盐通报》2014年第10期2636-2642,共7页Bulletin of the Chinese Ceramic Society

基　　金：湖南省科技计划项目2011SK3211);湘潭市重大科技计划项目(ZD20111010);衡阳市科技计划项目(2009KG60)

摘　　要：本文利用数值模拟热重分析(TGA)-差示扫描量热分析(DSC)联合方法,研究了中材湘潭水泥有限责任公司水泥回转窑燃煤中不同烟煤掺混量下混煤的燃烧特性。结果表明:燃烧全无烟煤时燃烬率约为67.6%,燃烧效率低下。随着烟煤掺混量增大,混煤活性提高,着火温度降低;回转窑内高温区变短,黑火头缩短;烟煤的比例增至80%时,混煤燃烬率大幅度提高,此后再增大烟煤比例,燃烬率并无明显变化;混煤燃烧烈度I降低,燃烧趋于平缓,无爆燃现象出现;平均放热强度Z增大,煤粉燃烧效率提高。综合分析燃烧烈度I、平均放热强度Z、燃烧特性指数S对燃烧特性和水泥煅烧的影响,确定混煤中烟煤与无烟煤的比例为4∶1最优。This paper studies blended coals combustion characteristic under different blending amount of bituminous coal in the cement kiln of Sinoma Xiangtan Cement Co. Ltd,by using Numerical Simulation and TGA-DSC method. The results indicate that the burnout ratio is about 67. 6% when burning anthracite coal. As the blending amount of bituminous coal increases, the blended coal activity increases,and the ignition temperature decreases. Meanwhile the high temperature zone and the dark part of flame will be narrowed. When the ratio of bituminous coal grows to 80%,the blended coals burnout ratio increases significantly. Reducing combustion intensity I of coal makes the combustion process relatively soft and avoid deflagration phenomenon. In addition,strengthening the average heat liberation intensity Z makes pulverized coal combustion more efficient. Considered of combustion intensity I,combustion characteristic index S and average heat liberation intensity Z ＇ effect on the combustion characteristic and cement calcination,the best scale between bituminous coal and anthracite coal is 4 to1.

关 键 词：水泥回转窑 数值模拟 热重分析 混煤配比 

分 类 号：O242[理学—计算数学]