分解窑混煤富氧燃烧研究  

Research on oxy-fuel combustion of blended coal in precalciner kiln

作　　者：徐顺生[1,2] 杨易霖[1] 时章明[2] 刘飞虹[1] 武浩[1] 肖逸奇 黄碧漪 

机构地区：[1]湘潭大学机械工程学院,湖南湘潭411105 [2]中南大学能源科学与工程学院,湖南长沙410083 [3]浙江大学能源工程学院,浙江杭州310058

出　　处：《中南大学学报（自然科学版）》2017年第11期3117-3126,共10页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51590891);郴州市科技计划重点项目(CZ2013163)~~

摘　　要：以2 500 t/d带四通道煤粉燃烧器的水泥分解窑为研究对象,通过理论分析和数值仿真方法,对分解窑内混煤富氧燃烧特性和燃烧规律进行研究,并通过实验验证仿真计算结果的可靠性。研究结果表明:随着燃烧器一次风O_2摩尔分数增加,煤粉着火温度逐渐降低,燃烧温度、窑内传热速率逐渐增加;应用富氧燃烧技术能显著改善分解窑混煤燃烧特性,大幅提高无烟煤掺混比;与一般空气助燃相比,当一次风O_2摩尔分数提高到27%时,火焰平均温度提高97 K,焦炭燃尽率提高5.09%,在此O_2摩尔分数下,无烟煤掺比增至60%时,混煤仍能高效稳定燃烧,火焰温度和形状仍能满足熟料煅烧要求。The oxy-fuel combustion of blended coal characteristics and rule were studied in the 2 500 t/d precalcinercement kiln with a four-channel burner via experiment and simulation, and the reliability of simulation results wasverified by experiments. The results show that as the oxygen mole fraction of primary air rises, the combustiontemperature and heat transfer rate both increase while the coal ignition temperature gradually reduces. The numericalcalculation indicates that the blended coal combustion characteristics in the precalciner kiln are considerably improvedusing the technology of oxy-fuel combustion. Besides, the blending ratio of anthracite suitable for the kiln greatlyincreases in the oxy-mode combustion. Compared with the traditional air-mode combustion, the average flametemperature and char burnout ratio increase by 97 K and 5.09%, respectively, when the oxygen mole fraction of primaryair is 27%. Meanwhile, even at the anthracite-blended ratio of up to 60%, the efficient and stable combustion are stillobtained, and the flame property including temperature and shape can meet the requirements of clinker calcinations.

关 键 词：分解窑 富氧燃烧 混煤 数值模拟 

分 类 号：TQ172.1[化学工程—水泥工业]