自激式除尘器压力波动特性与气液耦合

发布时间：2018-04-22 04:39

本文选题：自激式除尘器 + 压力波动　；参考：《煤炭学报》2015年12期

【摘要】：自激式除尘器以气相节流加速强化气、液、尘三者的相互交换,气液耦合过程非常复杂。现有研究主要从宏观上阐述气液耦合过程,忽略了气液耦合的微观特点,成为阻碍微细粉尘去除效率提升的瓶颈。用高频压力采集与高速摄像相结合,对除尘器压力波动特性与气液耦合形态进行了研究,得到如下结论:该除尘器内部压力表现出明显的波动特性,不同运行条件的气相压力在低频波动方面表现出明显的差异性;除尘器气液耦合模式在实验区间内有静液位差模式、水击模式、微弱波动模式、剪切液幕模式和卷吸气泡模式等5种典型模式,后两种为正常运行工况模式;除尘器正常运行时主要产生两种不同形态的捕集体,剪切液幕模式以剪切液滴(体)组成的液幕为主,卷吸气泡模式以卷吸过程产生的气-液混合体和卷吸进入液面之下的气泡为主。
[Abstract]:Self-excited precipitator accelerates the exchange of gas, liquid and dust with gas throttle, and the gas-liquid coupling process is very complex. The present research mainly elaborates the gas-liquid coupling process from the macroscopic view, neglects the microscopic characteristic of the gas-liquid coupling, and becomes the bottleneck which hinders the enhancement of the removal efficiency of fine dust. With the combination of high frequency pressure acquisition and high speed video recording, the pressure fluctuation characteristics of the dust collector and the gas-liquid coupling form are studied. The conclusions are as follows: the internal pressure of the precipitator shows obvious fluctuation characteristics. The gas pressure of different operating conditions shows obvious difference in low frequency fluctuation, the gas-liquid coupling mode of dust collector has static liquid level difference mode, water hammer mode, weak fluctuation mode in the experimental interval, There are five typical models, such as shearing liquid curtain mode and entrainment bubble mode, the latter two modes are normal operating mode, while the dust collector produces two kinds of different kinds of collectives during normal operation. The shearing liquid curtain model is mainly composed of shearing liquid droplets (bodies), and the entrainment bubble model is mainly composed of gas-liquid mixture produced by entrainment and bubbles entrainment below the liquid level.
【作者单位】：中国矿业大学化工学院;
【基金】：国家自然科学基金资助项目(51404252) 国家级大学生创新训练计划资助项目(201410290028)
【分类号】：TD714.4

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