轴流式气-液旋流分离器分离特性

针对内部设有中心体的轴流式气-液旋流分离器，根据液滴在分离器内部旋流场的受力情况，建立分离器分离效率模型。实验发现，当液滴直径大于10 μm时，通过理论模型求得的液滴粒级分离效率与实验值吻合较好；在一定气速范围内，减小导流叶片出口角、增加中心体直径以及减小排气管直径均能够提高分离效率，即对于一定结构的分离器，存在相应的临界气速能够使分离器的分离效率达到最大值，随气速继续增大，分离效率呈下降趋势。根据实验结果提出分离器在不同工况下的设计准则，当气速高于临界气速时，为保证分离器分离效率，维持较低压降，设计导叶出口角为45°，中心体直径与筒体直径比为0.5，排气管直径与筒体直径比为0.85，分离器长度与筒体直径比为3。当入口气速低于临界气速时，可根据理论模型对分离器结构参数进行调整。

Separation Characteristics of Axial-Flow Cyclone Separator

For the axial-flow gas-liquid cyclone separator with a center body inside, a separation efficiency model is established according to the force of droplets in the internal swirling flow field of the separator. Experimental results show that, as droplet sizes larger than 10 μm, the theoretical separation efficiency from the model is in good agreement with experimental results. Within a certain range of gas velocity, separation efficiency can be improved by reducing outlet angle of the guide vane, increasing centrifuge diameter, or reducing diameter of outlet gas pipeline. For a certain structure separator, there is a critical gas velocity at which the best separation efficiency can be reached. After reaching the critical gas velocity, separation efficiency will decline if continue increasing gas velocity. According to experimental results, the design criteria of a separator under different working conditions can be proposed. When gas velocity is higher than the critical gas velocity, the best separation efficiency of a separator can be achieved with the following design parameters: low pressure drop, outlet angle of the guide vane at 45°, ratio of center body diameter to cylinder diameter 0.5, ratio of exhaust pipe diameter to cylinder diameter 0.85, and ratio of separator length to cylinder diameter 3. When the inlet gas velocity is lower than the critical gas velocity, the structural parameters of the separator can be adjusted according to the theoretical model.