水泥回转窑低NO_x燃烧器的NO_x的生成与控制的研究  

Research of NO_x Formation and Control in Rotary Cement Kiln with Low NO_x Burner

作　　者：廖斌[1] 卿山[1] 胡平[1] 张小辉[1] 王仕博[1] 杨舒萍[1] 

机构地区：[1]昆明理工大学冶金与能源工程学院复杂有色金属资源清洁利用国家重点实验室,昆明650093

出　　处：《材料导报（纳米与新材料专辑）》2015年第2期202-206,共5页

基　　金：国家自然科学基金(51064015)

摘　　要：对云南某水泥厂4000t/d回转窑使用的低NOx四通道燃烧器及一内径3m,长48m的水泥回转窑进行数值模拟仿真并与实际运行工况测得的数据进行对比分析。对燃烧器和回转窑进行全尺寸的三维建模和结构化网格划分,其中气相采用RNG k-ε湍流模型,离散相采用颗粒轨道模型,燃烧模型采用非预混燃烧模型,辐射模型采用P-1模型。计算结果合理地反映了窑内的速度场、温度场、组分场的规律。结果表明,该低NOx燃烧器能够有效控制NOx的生成;水泥回转窑内NOx的生成主要受温度、氧气浓度、氮气浓度的影响,并且由于窑内高温的影响热力型NOx生成为主要方式;为了降低回转窑NOx的排放,在实际生产过程中应避免窑内形成局部高温区,可通过调节燃烧器各通道风量所占一次风的比例来达到此目的。A rotary cement kiln with a specially designed low NOx four-channel burner in Yunnan province was simulated to investigate the characteristics of coal combustion in the rotary cement kiln with a comprehensive computational fluid dynamics （CFD） methodology. The inner diameter of the kiln is 3 m and the length is 48 m Simulation re sults were validated against experimental data. RNG k-ε model for turbulence, P1 radiation model for gas-phase radiation, non-premixed model and discrete phase model （DPM） for coal combustion were used in 3-D structured grid CFD simulation. The flow field, temperature field and species concentrations in the kiln were presented. The results showed that the low NOx burner can effectively control the formation of NOx. The amount of NOx in the kiln is mainly influenced by the temperature, concentrations of N2 and O2, and the thermal NOx played a domain part role in the NOx amount due to high temperature in the kiln. In order to reduce NOx emission, local high temperature zone should be avoided in the actual production process, and the proportion of the air quantity of each channel can be changed to achieve this purpose.

关 键 词：低NOx四通道燃烧器 水泥回转窑 NOx 数值模拟 

分 类 号：TQ534.9[化学工程—煤化学工程]