Experiment on dust suppression performance of selfpriming sprayer
MA Zhong-Fei-1, 2 , ZHANG Yu-Xiang-1, YANG Xiu-Li-1, GE Zhi-Lin-1
(1.School of the Environment, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China)
To improve the spray dust suppression,a means,namely selfpriming sprayer dust suppression,was put forward,the working principle of dust suppression was analyzed,and the selfpriming sprayers with different structures were designed.The orthogonal and related comparison experiments were made on those designed selfpriming sprayers.The test results indicated that the distance between the mixing chamber throat and driving nozzle outlet,diffusion angle and driving pressure have different effects on the SMD value,effective range,atomization angle,amount of air entrained.When the distance between the mixing chamber throat and driving nozzle outlet,diffusion angle and driving pressure are 48 mm,30° and 6 MPa,those parameters achieve their optimal values and the best performance presents in dust suppression.The SMD value of conventional single nozzle spray is 124.3 μm,but that of selfpriming sprayer is 108.5 μm,causing a reduction of 12.7% in SMD.As the driving pressure is 6 MPa,the efficiency of all size dust removal is 92.67% and that of breathable dust removal is 87.21% in a conventional single nozzle spray.However,at the same driving pressure,the efficiency of all size dust removal 93.6% and that of breathable dust is 92.69% in the selfpriming sprayer optimized by the orthogonal experiments.Obviously,the dust removal efficiency of breathable dust has been improved greatly in the optimized selfpriming sprayer compared with the efficiency of all size dust removal.
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