洁净煤技术

2020, v.26;No.129(05) 119-126

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荷电水雾团聚亚微米颗粒物试验研究
Experimental investigation on submicron particle agglomeration through atomized charged droplets

刘鹤欣;杨富鑫;李正鸿;谭厚章;杜勇乐;冯鹏;
LIU Hexin;YANG Fuxin;LI Zhenghong;TAN Houzhang;DU Yongle;FENG Peng;Key Laboratory of Thermo-Fluid Science and Engineering,Ministry of Education,Xi'an Jiaotong University;

摘要(Abstract):

荷电水雾团聚亚微米颗粒物是多场协同脱除微细颗粒物的一种方式,众多学者针对水雾荷电脱除颗粒物特性进行了大量理论和试验研究,但鲜见对超声波雾化液滴荷电团聚微细颗粒物的相关研究。设计了双层阻挡介质放电电极结构,在有效阻断传统电晕放电隙内放电电弧发展的同时,通过产生均匀稳定的高密度低温等离子体对雾化液滴进行荷电,并搭建荷电水雾团聚亚微米颗粒物试验平台对电极稳定特性和微细颗粒物的团聚特性进行研究,主要针对电极伏安特性、负载电压对团聚效率的影响以及水雾量对团聚效率的影响3方面进行比较与表征。结果表明,双层阻挡介质结构有利于改善荷电电极间隙的均匀性,雾化液滴的存在有利于促进气隙空间放电。荷电电极的起晕电压与不稳定运行电压随雾化量的增加均表现为减小;当通入水雾流量为102.9 mg/min时,稳定运行的电压区间为17.2~41.1 kV。荷电雾化液滴对微细颗粒物团聚具有明显效果,其中30~70 nm颗粒在45.0 kV作用下最高达到40%团聚效率。粒径分布曲线随雾化量的增加整体向粒径增大方向移动,也表明雾化量的增加有利于荷电雾化液滴对微细颗粒物的脱除;相同电压下,颗粒团聚效果随水雾量的增加明显提升。
The submicron particle agglomeration by atomized charged droplets is an effective method of multi-field synergistic agglomeration of fine particles. Many scholars have carried out a lot of theoretical and experimental studies on the characteristic of fine particle removal through charged droplets. However,few studies have been conducted on the study of fine particle agglomeration of atomized charged droplets with particle size diameter of about 5 μm. In this paper,a double-layer dielectric barrier discharge electrode was designed to effectively block the development of the discharge arc in the traditional corona discharge gap and charge the atomized droplets by producing a uniform and stable high-density low-temperature plasma. Meanwhile,an experimental platform of submicron particle agglomeration through the atomized charged droplets was built for the experimental study of electrode stability and agglomeration characteristics of fine particles. Three aspects of electrode volt-ampere characteristics,the influence of load voltage on the agglomeration efficiency,and the influence of water mist quantity on the agglomeration efficiency were compared and characterized. The results show that the structure of the double-layer barrier medium is beneficial to improve the uniformity of the gap between charged electrodes,and the existence of atomized droplets is beneficial to promote the discharge in air gap space. Both the initiation voltage and unstable operating voltage of charged electrode decrease with the increase of the water mist flow. When the water mist flow is 102.9 mg/min,the voltage range for stable operation is17.2-41.1 kV. The atomized charged droplets have obvious effect on the agglomeration of fine particles. The agglomeration efficiency of 30-70 nm particles can reach up to 40% under the action of 45.0 kV. With the increase of atomization amount,the particle size distribution curve moves towards the increase of particle size as a whole,which also indicates that the increase of atomization amount is conducive to the removal of fine particles by charged atomization droplets. Under the condition of the same voltage,the particle agglomeration effect is significantly improved with the increase of the water mist flow.

关键词(KeyWords): 超声波雾化荷电;介质阻挡放电;团聚效率;亚微米颗粒;伏安特性
ultrasonic atomizing charge;dielectric barrier discharge;agglomeration efficiency;submicron particles;Volt-ampere characteristic

Abstract:

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基金项目(Foundation): 国家重点研发计划资助项目(2016YFB0601504)

作者(Author): 刘鹤欣;杨富鑫;李正鸿;谭厚章;杜勇乐;冯鹏;
LIU Hexin;YANG Fuxin;LI Zhenghong;TAN Houzhang;DU Yongle;FENG Peng;Key Laboratory of Thermo-Fluid Science and Engineering,Ministry of Education,Xi'an Jiaotong University;

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DOI: 10.13226/j.issn.1006-6772.IF20080617

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