摘要
采用CFD Fluent 6.3软件模拟了自主研发的低阶煤低温干馏炉对喷式低温燃烧室内温度场分布,并对其结构进行了优化。结果表明：在燃烧室内设计4个关于燃烧室中央轴对称的长度分别为800mm和500mm、旋转角度分别为±30°和±10°的直挡板后,燃烧室内横向、纵向平均温度满足褐煤低温热解需求（500-650℃）;采用非预混模式、过量空气系数为1.25和煤气管径为50mm时,燃烧室的燃烧特性最佳;过量空气系数、煤气与空气预混方式、管径均会影响燃烧室内温度分布;Realizable k-ε湍流模型、P-1辐射模型和非预混燃烧模型适用于计算焦炉煤气和空气低温燃烧室内燃烧温度场分布;模拟计算结果与实验结果基本吻合,误差波动幅度为50-70℃,同时对燃烧后烟气的检测结果表明,烟气排放符合标准要求。
The temperature field distribution inside a self-developed opposing spraying style low-temperature combustion chamber in low-temperature pyrolysis oven firing low-rank coal was simulated by CFD Fluent 6.3software.Moreover,the combustion chamber＇s structure was also optimized.The results show that,by designing four central axisymmetric straight dampers with length of 800 mm and 500 mm and rotation angle of±30°and ±10°,the horizontal and vertical average temperature of the combustion chamber can meet the demands of lignite low-temperature pyrolysis（500℃to 650℃）.In non-premixed combustion mode with excessive air coefficient of 1.25 and the sprayer diameter of 50 mm,the combustions characteristics of the combustion chamber reached the optimum condition.The excessive air coefficient,fuel premixed mode and coal feed pipe diameter can affect the temperature field distribution in the combustion chamber.The k-εturbulence model,P-1radiation model and non-premixed combustion model were appropriate for calculating the temperature field distribution for the combustion of coke oven gas and air in the low temperature combustion chamber.The simulation results basically agreed with the experimental results,the error only fluctuated from 40℃to 80℃.Test on the exhaust gas shows the emitted flue gas satisfied the industrial emission standards.
出处
《热力发电》
CAS
北大核心
2015年第8期55-61,共7页
Thermal Power Generation
基金
国家自然科学基金项目(51274147)
国家科技支撑计划项目(2012BAA04B03)
关键词
低阶粉煤
低温干馏炉
低温燃烧室
NOX排放
CFD模拟
low-rank pulverized coal
low-temperature carbonization
low-temperature combustion chamber
NOx emission
CFD simulation
