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引言 惯性分离器与旋风分离器相比具有结构简单、易于布置、运行费用低等优点,因此广泛应用于循环流化床锅炉中。现有的许多惯性分离器都占据一个很大的水平烟道,使过热器布置不便,且对材质要求高,不能很好地满足大型化循环流化床锅炉的需要。浙江大学开发的新型鳍片管束撞击式分离器,其分离元件是由鳍片焊在锅炉中垂直布置的过热管束或对流管束上构成,从而将分离与强化传热相结合,分离性能试验研究表明其具有高效、低阻、结构紧凑、能强化传热、降低磨损等优点。为进一步研究鳍片管束分离器的分离、传热、磨损等特性,本文用三维粒子动态分析仪（3D-PDA）对其流动特性进行了冷态试验研究,并考虑了来流风速和鳍片结构对流动特性的影响。本文对测试结果进行了分析讨论,这些结果为鳍片管束分离器的优化设计以及气固分离机理的研究奠定了良好的基础。
INTRODUCTION Inertial separators have the advantages of simple structure, easy arrangement and low operating costs compared with cyclones. Therefore, they are widely used in circulating fluidized bed boilers. Many of the existing inertial separators occupy a large horizontal flue, which makes the arrangement of the superheater inconvenient and material demanding, which can not meet the needs of a large-scale circulating fluidized bed boiler well. Zhejiang University developed a new finned tube bundle impact separator, the separation element is welded by fins in the boiler vertically arranged overheat bundle or convection tube bundle, which will be separated and enhanced heat transfer combined with the separation performance test shows that It has high efficiency, low resistance, compact structure, can enhance heat transfer, reduce wear and other advantages. In order to further study the characteristics of separation, heat transfer and wear of fin tube bundle separator, the flow characteristics of the fin tube bundle separator were studied in a cold state using 3D-PDA and the flow velocity and fins Effect of structure on flow characteristics. In this paper, the test results are analyzed and discussed. These results have laid a good foundation for the optimal design of the fin tube bundle separator and the research on the gas-solid separation mechanism.