墙式布置切圆燃烧的冷态模化试验  

Cold Modeling Experiment of Wall Tangential-firing Combustion

作　　者：陈建[1] 秦明[1] 孔超[1] 陈力哲[1] 吴少华[1] 

机构地区：[1]哈尔滨工业大学能源科学与工程学院,哈尔滨150001

出　　处：《机械工程学报》2010年第18期162-168,共7页Journal of Mechanical Engineering

摘　　要：部分厂家对超临界以及超超临界技术采用了墙式切圆燃烧方式。对一台采用这种燃烧方式的超超临界锅炉进行冷态模化试验,并且采用三维粒子动态分析仪(Particle dynamicsanalyzer,PDA)测量燃烧器区域的气固两相流动特性,以研究该燃烧器在炉内的气流流动特性以及不同运行参数对流场变化的影响。分别对墙式燃烧方式的速度分布、速度衰减特性以及浓度分布进行了分析。结果表明,一次风率越高,切圆越小;而且提高一次风率,也有助于减缓射流的衰减;该燃烧方式会在炉膛中心形成一高浓度区,形成低NOx燃烧,且该区域浓度随着一次风率的提高而略有增大,但是由于射流偏转,也会在侧墙边壁处形成高浓度区。The type of wall tangential-firing combustion in supercritical and ultra supercritical technologies is adopted by some factories.To research the flow characteristics in the furnace and the influence of different operation parameters on the changes of flow field,cold experiment is conducted on the modeling test-bed of an ultra supercritical boiler adopting this type of combustion and a three-dimensional particle dynamic analyzer（PDA） is employed in this experiment for measurement of the characteristics of two-phase gas/particle flows in the burner area.The distribution of the gas/particle velocity and particle concentration of the primary air,as well as the velocity attenuation characteristics are obtained.The results show that,the tangential circle decreases with the increase of primary air ratio.Increasing primary air ratio is also helpful to showing the velocity attenuation.A high concentration region can be formed in the center of the furnace,which can lead to low-NOx combustion.Furthermore,the concentration in this region can increase slightly with the increase of primary air ratio.However,due to deflection of shooting flow,another higher concentration region can be formed beside the side wall.

关 键 词：墙式切圆 模化试验 三维粒子动态分析仪 超超临界锅炉 

分 类 号：TK224.1[动力工程及工程热物理—动力机械及工程]