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为提高喷雾降尘效率,以改善作业环境,有必要研究喷嘴直径与降尘效果间的关系。基于自行设计的喷雾降尘试验系统,采用马尔文实时高速喷雾粒度分析仪、高速摄像仪及粉尘浓度测定仪对不同直径喷嘴的雾化特性参数和降尘效率进行测定。结果表明,在相同喷雾压力下,随着喷嘴直径的增大,全尘降尘效率持续增加,而呼吸性粉尘降尘效率先增加后减小,并在喷嘴直径为1.5 mm时达到最大值;在耗水量相同的情况下,随着喷嘴直径的增大,全尘和呼吸性粉尘降尘效率均下降。在井下喷雾降尘中,当耗水量不受限制时,为同时确保全尘和呼吸性粉尘降尘效率,宜选择直径为1.5 mm的喷嘴;当耗水量受限制时,宜选择直径为1.2 mm的喷嘴。
In order to improve the efficiency of spray dust reduction to improve the working environment, it is necessary to study the relationship between nozzle diameter and dust reduction effect. Based on the self-designed spray dust-reducing test system, Malvern real-time high-speed spray particle size analyzer, high-speed camera and dust concentration meter were used to measure the atomization parameters and dust-reducing efficiency of different diameter nozzles. The results show that under the same spray pressure, the efficiency of dust reduction increases with the increase of nozzle diameter, while the dust reduction efficiency of respirable dust first increases and then decreases, reaching the maximum when the nozzle diameter is 1.5 mm. With the same amount of water, as the diameter of the nozzle increases, the dust reduction efficiency of all dust and respiratory dust drops. In downhole spray dust suppression, when the water consumption is not limited, in order to ensure both the dust and respiratory dust dust dust efficiency, should choose a nozzle diameter of 1.5 mm; when the water consumption is limited, should choose a diameter of 1.2 mm nozzle .