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为改善超声波雾化效果,提高超声干雾的除尘效率,根据空气动力学、“云”物理学和斯蒂芬流输运原理,研究超声干雾抑尘机理。采用自行设计的雾流参数测定试验装置,研究压缩空气的压力(气压)、水流量等指标对超声雾化器雾化效果的影响,得出超声雾化器合理的供气压力和供水流量。选取烧结磁铁矿粉尘为呼吸性粉尘样品,在超声雾化器最佳运行条件下对其除尘效率进行测定。研究结果表明:微细水雾有利于呼吸性粉尘的捕集。超声雾化器的最佳运行条件为:气压0.35 MPa,水流量30 L/h。在此运行条件下,其对呼吸性粉尘的平均除尘效率为98.3%,最高可达98.6%。
In order to improve the ultrasonic atomization effect and enhance the dust removal efficiency of ultrasonic dry fog, the mechanism of ultrasonic dry fog suppression was studied according to the principles of aerodynamics, cloud physics and Stephen flow transport. The self-designed fog flow parameter measurement device was used to study the influence of compressed air pressure (air pressure) and water flow on the atomization effect of ultrasonic atomizer. The reasonable supply pressure and water flow rate of ultrasonic atomizer were obtained. Sinter magnetite dust was chosen as the sample of respirable dust, and its dust removal efficiency was measured under the optimal operating conditions of the ultrasonic atomizer. The results show that: fine mist is conducive to the capture of respiratory dust. The optimum operating conditions of ultrasonic nebulizer: pressure 0.35 MPa, water flow 30 L / h. Under this operating condition, the average dust removal efficiency of respiratory dust was 98.3%, up to 98.6%.