Study on the influence of particle size on wettability of lignite dust
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摘要:
喷雾降尘技术的降尘效率与煤尘的润湿性密切相关，而煤尘的润湿性受诸多因素影响。为了研究粒径对煤尘润湿性的影响，以内蒙古雁南煤矿4种不同粒径煤粉为研究对象，从接触角、沉降效率、红外光谱、润湿热4个方面探讨粒径对煤尘润湿性的影响规律。研究表明：当煤尘粒径逐渐增大时，接触角则逐渐减小，亲水沉降效果显著；粒径变化没有造成煤尘官能团种类的缺失，但是随着煤尘粒径的减小，含氧官能团减少，煤尘亲水性影响因子减小；润湿热与同种煤尘粒径呈负相关关系，与接触角呈正相关关系，因此可以用润湿热表征不同粒径煤尘润湿性的好坏。研究结果可为提高煤尘润湿效率和矿井煤尘防治技术发展提供一定的参考。
Abstract:The dust removal efficiency of spray dust removal technology is closely related to the wettability of coal dust, which is affected by many factors. In order to study the influence of particle size on the wettability of coal dust, four kinds of coal fines with different particle sizes in Yannan Coal Mine of Inner Mongolia were taken as the research object, and the influence law of particle sizes on wettability of coal dust were discussed from four aspects including contact angle, settling efficiency, infrared spectrum and heat of wetting. The results show that when the particle size increases gradually, the contact angle decreases gradually, and the hydrophilic sedimentation effect is significant; the change of particle size does not cause the loss of functional groups of coal dust, but with the decrease of particle size, the oxygen-containing functional groups decrease, and the hydrophilic influence factor of coal dust decrease; the heat of wetting has a negative correlation with the particle size of the same kind of coal dust and a positive correlation with the contact angle, therefore, heat of wetting can be used to represent the wettability of coal dust of different particle sizes. The research results can provide some references for improving the wettability efficiency of coal dust and the development of coal dust control technology.
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Keywords:
- coal dust /
- particle size /
- wettability /
- contact angle /
- infrared spectrum /
- heat of wetting
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表 1 煤粉的工业分析、元素分析结果
单位：% 工业分析 元素分析 水分 灰分 挥发分 固定碳 C H O N S 7.62 33.22 34.37 24.79 40.53 4.26 53.94 0.97 0.30 注：固定碳与O的质量分数用差减法得出。 
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表 2 不同粒径煤尘的含氧官能团占比
粒径/μm 含氧官能团占比/% —OH —COOH 120~180 35.86 14.25 96~119 33.69 11.39 75~95 32.26 8.45 1~74 29.82 5.26
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