Abstract:

By constructing the inertial separation device test platform and combining the data acquisition of the relevant detection equipment, the performance analysis of a certain type of inertial demister was carried out. It was found that the separation efficiency of the two-channel baffled inertial separation device was proportional to the droplet diameter. For droplets with a fine particle size of 5μm to 10μm, the separation effect was not good, and the wind speed had little effect on the separation efficiency. The droplet separation effect was better for 30μm or more, and the overall efficiency exceeded 80%. In terms of system inlet and outlet pressure drop loss, the change of particle size was approximately negligible to the whole device. The pressure drop curve under different particle size conditions was basically the same, and the wind speed was the main influencing variable of pressure drop change. In order to break through the limitation of poor separation of small particle size droplets, the separation efficiency and pressure drop of different size parameters were analyzed from the aspects of plate spacing, bottom height and plate shape. The calculation results showed that the larger the plate spacing value, the lower the separation efficiency and the smaller the system pressure drop. The change in bottom height and efficiency was not generally related, and there was fluctuation and local correlation. When the best height was 30mm, the system pressure drop was also small. The more channel stages, the higher the separation efficiency, but the larger the pressure drop. The streamlined wall separation effect was better, and the ability to control the pressure drop was also stronger.

Key words: inertial separation device, performance analysis, separation efficiency, system pressure drop, structure optimization

摘要：

通过搭建惯性分离装置测试平台，结合相关检测设备的数据采集，进行某型惯性除雾器的性能分析。实验发现，两通道折流惯性分离装置的分离效率与液滴直径成正比。对于微小粒径5～10μm的液滴分离效果不佳，风速对分离效率的影响不大。对于30μm以上的液滴分离效果较好，效率整体超过80%。系统进出口压降损失方面，粒径的变化相对于整个装置可以近似忽略，不同粒径条件下压降曲线变化基本相同，风速是压降变化的主要影响变量。为突破小粒径液滴分离效果不佳的限制，分别从板间距、底面高度及板型等方面入手，分析不同尺寸参数条件下分离效率与压降的变化规律。计算结果表明，板间距数值越大，分离效率越低，系统压降越小；底面高度与效率变化并不是总体相关，存在波动并呈现局部相关性；高度增加到30mm时达到最佳，系统压降也较小；通道级数越多，分离效率越高，但压降增加较大；流线型壁面分离效果较好，控制压降的能力也较强。

关键词: 惯性分离装置, 性能分析, 分离效率, 系统压降, 结构优化