水泥回转窑内煤粉富氧燃烧特性研究  

Study on Oxygen-rich Combustion Characteristics of Pulverized Coal in Cement Rotary Kiln

作　　者：严智 杨子怡 宁克祥 雷可 倪纪伟 张井浩 黄庠永 顾明言 YAN Zhi;YANG Ziyi;NING Kexiang;LEI Ke;NI Jiwei;ZHANG Jinghao;HUANG Xiangyong;GU Mingyan(School of Energy and Environment,Anhui University of Technology,Ma’ansha 243002,China)

机构地区：[1]安徽工业大学能源与环境学院,马鞍山243002

出　　处：《工程热物理学报》2025年第3期1003-1008,共6页Journal of Engineering Thermophysics

基　　金：安徽高校协同创新项目(No.GXXT-2020-006)。

摘　　要：在国家节能降耗及双碳背景下,水泥行业节能减排减碳是一项十分重要的工作。富氧燃烧有利于提高水泥回转窑内温度、增加熟料产量、降低煤耗和提高煤种适应性等,但氧浓度提高使得NOx排放量相较常规氧浓度燃烧增加。本文以水泥回转窑为研究对象,运用数值模拟方法分析了一次风氧浓度、烟气再循环率和过量空气系数对水泥回转窑内煤粉富氧燃烧特性的影响规律。结果表明:随着一次风氧气浓度的增加,窑内的火焰长度变短,当一次风氧气浓度由21%增加到33%时,回转窑内最高温度由1964 K升高到2071 K。循环烟气的加入降低了窑内的氧浓度,使煤粉中挥发分和焦炭的燃烧性能变差,燃烧效果降低,降低了窑内的燃烧温度。过量空气系数的增加,回转窑内的温度有所降低。In the context of national energy conservation and carbon peaking and carbon neutral-ity,energy conservation,emission reduction and carbon reduction in the cement industry is a very important task.Oxy-fuel combustion is beneficial to increase the temperature in the cement rotary kiln,increase the clinker output,reduce coal consumption and improve the adaptability of coal types,but the increase of oxygen concentration increases the NOx emission compared with the conventional oxygen concentration combustion.In this paper,the effects of primary air oxygen concentration,flue gas recirculation rate and excess air coefficient on the oxygen-rich combustion characteristics of pulverized coal in cement rotary kiln were analyzed by numerical simulation method.The results show that with the increase of primary air oxygen concentration,the flame length in the kiln becomes shorter,and when the primary air oxygen concentration increases from 21%to 33%,the maximum temperature in the rotary kiln increases from 1964 K to 2071 K.The addition of circulating flue gas reduces the oxygen concentration in the kiln,makes the combustion performance of volatiles in pulverized coal and coke worse,reduces the combustion effect,and reduces the combustion tem-perature in the kiln.As the excess air coefficient increases,the temperature in the rotary kiln decreases.

关 键 词：水泥回转窑 煤粉燃烧 NOX排放 数值模拟 

分 类 号：TQ172.622[化学工程—水泥工业]