采用PDA测量系统 ,对四角切圆锅炉中垂直浓淡煤粉燃烧方式下影响一次风与主流场混合和扩散的炉内拟序结构进行了实验研究和湍流特性分析。结果表明 ,一次风射流由于与上游横向射流的相互作用 ,在背火侧形成尾迹涡 ,在向火侧形成剪切涡 ,其中尾迹涡和剪切涡中有较高的湍动能和剪切应力 ,对颗粒的扩散起着主控作用。并从理论上分析了垂直浓淡煤粉燃烧技术可能不利于煤粉颗粒的燃尽 ,而且是容易导致水冷壁结渣的原因 A PDA measuring system was used to study the simulation and turbulent characteristics of the furnace in the furnace with vertical and lean pulverized coal combustion in a tangentially fired boiler. The results show that due to the interaction with the upstream transverse jet, the primary air jet forms a wake vortex at the backfire side and forms a shear vortex at the side of the fire, where the wake vortex and the shear vortex have higher turbulent kinetic energy and shear stress , Plays a dominant role in the diffusion of particles. And theoretically analyzed the vertical blind pulverized coal combustion technology may not be conducive to the burnout of pulverized coal particles, but also easily lead to the formation of water wall slagging