利用CFD技术对城市生活垃圾富氧燃烧特性分析  

Research on the Characteristics of MSW(Municipal Solid Waste) Oxygen-enriched Combustion Based on Computational Fluid Dynamics

作　　者：刘国辉[1] 马晓茜[1] 余昭胜[1] 

机构地区：[1]华南理工大学电力学院,广东广州510640

出　　处：《热能动力工程》2009年第2期247-251,共5页Journal of Engineering for Thermal Energy and Power

摘　　要：富氧燃烧技术具有明显的节能与环保效益,是低热值垃圾稳燃,减少污染物排放的有效措施。运用CFD技术对垃圾在机械炉排炉内富氧气氛下的燃烧特性进行了研究,给出了O2/N2=21:79和O2/N2=25:75两种工况下床层上方的烟气温度、烟气组分浓度曲线及床层焦炭分布图。模拟结果表明:当一次风的氧气浓度由21%(v)提高到25%(v)时,垃圾床层表面燃烧区域平均温度由1350K升高到了1466K,增加了116K;灰渣中可燃物(焦炭)含量由3.9%(wt)降为0.1%(wt),随着氧气浓度增加,垃圾着火位置前移,提前进入稳定燃烧阶段。模拟结果与前人的试验测量值吻合。The oxygen-enriched combustion technology enjoys conspicuous benefits of energy-saving and environment protection,and represents an effective measure for achieing a steady combustion of low-heat-value wastes and reducing pollutant emissions.By employing CFD (Computational Fluid Dynamics) technology,studied were the characteristics of MSW (Municipal Solid Waste) combustion in the oxygen-enriched atmosphere of a mechanical stoker.The authors have presented the curves showing the flue gas temperature and constituent concentration over and above the waste-burning bed layer as well as the bed layer coke distribution under the following two operating conditions,i.e.O2/N2=21:79 and O2/N2=25:75.The simulation results show that when the oxygen concentration of the primary air is increased from 21% to 25% (by volume),the average temperature of the combustion zone on the surface of MSW bed layer will rise from 1 350 K to 1 466 K,namely,an increment of 116 K.The combustible (coke) content of ash slag will decline from 3.9% to 0.1% (by weight).With an increase of oxygen concentration,the ignition location of the MSW will shift forward with the MSW entering a steady combustion stage ahead of schedule.The simulation results are in good agreement with the test ones measured by predecessors.

关 键 词：生活垃圾 焚烧 富氧 数值模拟 马丁往复炉排 

分 类 号：TK224.1[动力工程及工程热物理—动力机械及工程]