分解炉内混煤燃烧最佳三次风速的模拟研究  

Simulation Study on the Best Tertiary Air Velocity of Coal Blend Combustion in a Calciner

作　　者：徐顺生[1,2] 李罗军[1] 黄日升[1] 邓波[1] 张丽娜[1] 石永彬[1] 

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

出　　处：《过程工程学报》2013年第2期181-185,共5页The Chinese Journal of Process Engineering

基　　金：湖南省科技计划基金资助项目(编号:2011SK3211);湖南省自然科学基金资助项目(编号:09JJ9011);湖南省自然科学湘潭市联合基金重点资助项目(编号:ZD20111010);湖南省自然科学衡阳市联合基金资助项目(编号:2009KG60)

摘　　要：针对某公司5500t/d三喷腾分解炉内混煤燃烧效果不佳的问题,利用FLUENT软件,采用二步竞争反应模型及二混合分数方法,对炉内不同三次风速下的速度场、温度场及组分场进行模拟研究,得到了三次风对混煤燃烧的影响规律,并对模拟结果进行了验证.结果表明,二混合分数方法模拟结果符合混煤在分解炉内的实际燃烧情况;三次风速为26m/s时,混煤的主要燃烧区域占分解炉的2/3,煤粉燃烧的最高温度为1940K,煤粉的燃烬率为95.45%,分解炉内的温度分布满足生料分解的要求,避免了结渣.In order to solve the problem of coal blend ineffective combustion in a 5 500 t/d triple-spouting calciner, using FLUENT software and applying two-step competitive reaction model and two mixture fraction method, the fields of velocity, temperature and composition in the calciner were studied by numerical simulation under different tertiary air velocities. The influential law of tertiary air on the combustion of coal blend was obtained, and the simulation results were verified. The simulation results show that the results computed by the two-mixture-fraction and PDF calculation are in accordance with the real combustion of coal blend in the calciner. When the third air velocity is 26 m/s, the combustion zone of coal blend accounts for 2/3 of the calciner, the maximum combustion temperature of pulverized coal is 1940 K and the burnout rate of pulverized coal 95.45% in the calciner. The temperature distribution can meet the requirements of raw material decomposition, and slagging phenomenon can be avoided.

关 键 词：混煤 分解炉 数值模拟 燃烧 三次风 

分 类 号：TQ170[化学工程—硅酸盐工业]