In order to suppressing the particle deposition on vortex finder, a series of gas cyclones with the secondary swirling clean gas were developed inspired by the gas purge effect. Effects of the width and extension length of the flow channel as well as the secondary inlet velocity and running time on the particle deposition pattern, the deposited particle mass and the cyclones’ performance were experimentally investigated, respectively. The results show that the ultrafine particles (Stokes number < 0.0358) are mainly loose deposited on the walls under the secondary gas. Compare to the conventional cyclone with single tangential inlet, the total deposited particle mass of the improved cyclone has a maximum reduction more than 60%, and the collecting efficiency is increased up to 97.5% under the basically same pressure drop. The corresponding no-deposition area is increased by about 13%, and remains constant in spite of extending the running time. Moreover, an interesting phenomenon named “self-cleaning effect” of the vortex finder was captured for the gas cyclones, and mechanism of the secondary clean gas on the particle deposition is preliminarily analyzed. The results can deepen the understanding of the particle deposition on the vortex finder and guide the design of the anti-coking gas cyclones.

中文翻译：

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气体旋流器涡流器上抑制颗粒沉积的自洁效应和二次旋流清洁气体

为了抑制涡流探测器上的颗粒沉积，受气体吹扫效应的启发，开发了一系列带有二次旋转清洁气体的气体旋流器。实验研究了流道宽度和延伸长度以及二级入口速度和运行时间分别对颗粒沉积模式、沉积颗粒质量和旋风分离器性能的影响。结果表明，超细颗粒（斯托克斯数<0.0358）主要松散地沉积在二次气体下的管壁上。与传统单切向入口旋流器相比，改进后的旋流器总沉积颗粒质量最大减少了60%以上，在压降基本相同的情况下，捕集效率提高至97.5%。相应的无沉积面积增加了约13%，并且尽管延长了运行时间，但仍保持恒定。此外，还针对气体旋流器捕捉到了涡流探测器的“自清洁效应”这一有趣现象，并初步分析了二次清洁气体对颗粒沉积的影响机理。研究结果可以加深对涡流探测器上颗粒沉积的认识，指导防结焦气体旋流器的设计。