Study on field charged effect of micron-activated droplets and wettability of coal dust
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摘要:
水雾荷电与溶液活性处理作为2种增效降尘手段，独立使用时均表现出良好的降尘效果。为探究二者联合使用对微细粉尘的沉降效果，选取十二烷基硫酸钠表面活性剂配置活性溶液，利用紫铜芒刺环形电极进行电晕荷电，在微米尺度液滴场致荷电的背景下，探究了微米活性液滴的荷电效果及其对无烟煤的润湿性。结果表明：活性溶液相较于纯水对电场的响应更为敏感；水雾荷电与溶液活性处理对于增强液滴破碎、减小液滴粒径及增强溶液润湿性能表现出协同效应；微米荷电活性水雾相较于普通水雾对无烟煤尘的捕集效率更高，对全尘、呼吸性粉尘的沉降效率分别高达91.77%、90.45%。
Abstract:Water mist charging and solution active treatment, as two kinds of efficient dust removal methods, showed good dust removal effect when they used independently. In order to explore the settling effect of the combined use of the two on fine dust, sodium dodecyl sulfate (SDS) surfactant was used to prepare the active solution, and copper burr ring electrode was used for corona charging. Under the background of micron droplet field charging, the charging effect of micron active droplet and its wettability to anthracite were investigated. The results show that the active solution is more sensitive to electric field than pure water. Water mist charging and solution activity treatment showed synergistic effects on enhancing droplet fragmentation, reducing droplet size and enhancing solution wettability. Compared with ordinary water mist, micron-charged active water mist has higher capture efficiency for anthracite dust, and sedimentation efficiency for total dust and respirable dust is up to 91.77% and 90.45%.
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图 2 不同电压下电极间电场分布
Figure 2. Electric field distribution between electrodes at different voltages
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图 5 不同处理手段微米水雾的雾滴特征粒径
Figure 5. Characteristic particle size of droplets of micron water mist with different treatments
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图 7 不同处理手段溶液与无烟煤的固-液接触角
Figure 7. Solid-liquid contact angle between solution and anthracite with different treatments
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图 8 不同处理手段水雾接触角变化率
Figure 8. Change rate of spray contact angle with various treatments
表 1 喷雾降尘前后粉尘质量浓度及降尘效率
Table 1 Dust mass concentration and dust reduction efficiency before and after spraying
降尘措施 降尘前粉尘质量浓度/
（mg∙m−3）降尘后粉尘质量浓度/
（mg∙m−3）除尘效率/
%全尘 呼吸性
粉尘全尘 呼吸性
粉尘全尘 呼吸性
粉尘荷电活性水雾 663.81 234.53 54.62 22.39 91.77 90.45 普通水雾 662.44 235.58 189.24 78.32 71.44 66.76 
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