放热条件下的燃油油雾燃烧过程混合特性研究  

Research-Based Fuel Mist Mixing Characteristics of Combustion Process Under Heat Conditions

作　　者：何金桥[1] 曹雄[1] 陈湛源 赵华庚 

机构地区：[1]长沙理工大学能源与动力工程学院,长沙410004 [2]湖南省电力勘测设计院,长沙410007

出　　处：《重庆理工大学学报（自然科学）》2015年第3期25-29,57,共6页Journal of Chongqing University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(51275058);湖南省教育厅一般项目(11C0026)

摘　　要：为了研究在燃油油雾扩散燃烧过程中炉内烟气混合特性对油雾气流着火及燃尽性能的影响,针对2 t/h卧式锅壳锅炉的结构特点,建立了炉膛散热条件下油雾燃烧的非预混燃烧模型,并分析了炉内烟气的速度及温度分布特性。研究结果表明:在油雾燃烧过程中因蒸发吸热使得炉膛入口气流初始阶段的温度变化较小,轴向气流着火点的位置不受入口风速的影响,即均在离出口约0.7 m处;回流区随着风速的增大而增大,降低了轴线方向主燃烧区域的空间,不利于油雾燃料在炉内燃尽;最大回流速度随入口风速的增大而不断增大,当入口风速为7 m/s时,既有利于强化初始阶段的回流效应,达到促使油雾气流预热着火的目的,也有利于主燃烧区燃料的充分燃烧。In order to study the influence of mist smoke mist flow mixing characteristics in diffusion combustion furnace oil on the performance of fire and burn,we established non-premixed combustion model under mist burning furnace cooling conditions,according to the characteristics 2 t / h horizontal shell boiler structure,and analyzed the furnace flue gas velocity and temperature distribution characteristics. The results show that in the process of burning oil mist,the initial stage of airflow temperature of chamber entrance changes little for evaporation endothermic and the place of ignition point of axial flow can not be affected by the inlet velocity,which is at about 0. 7 m away from the exit of theexit. The recirculation zone increases with the increase of wind speed,which reduces the space in the axial direction of the main combustion zone and is not conducive to burn out fuel oil mist in the furnace. Maximum speed reflux inlet velocity increases with increasing of wind speed at the entrance,when the inlet velocity is of 7 m / s,which is not only helpful to strengthen the effect of the initial phase reflow,but also helpful to strengthen the mist flow preheat fire purposes,and is conducive to the primary combustion zone fuel combustion at the same time.

关 键 词：油雾燃烧 混合特性 PDF模型 回流区 

分 类 号：TK262[动力工程及工程热物理—动力机械及工程] TK264.1