综掘面双叶旋流湿式除尘器设计及参数优化

Design and parameter optimization of dual-blade swirling wet dust collector in fully mechanized excavation face

  • 摘要: 为了解决综掘面旋流式湿式除尘器除尘效果不理想等问题,设计了一种双叶旋流湿式除尘器,根据功能树法确立了该除尘器主要由环状喷雾装置、双旋流叶片、折流除雾板等组成,其中双旋流叶片可提供更大的离心力以提高除尘效率,通过内部雾化区、旋流区、脱水区的三重捕尘作用,实现含尘污风的高效率净化。基于煤矿实际应用需求,确定了外形尺寸、处理风量等技术参数,采用数值模拟方法单因素分析了喷嘴口径、喷雾压力、叶片安装角、旋叶片转速对湿式除尘器除尘效率的影响规律,通过响应曲面法建立了除尘效率与各因素之间的多元回归方程,得出了使湿式除尘器除尘效率最高时的最佳参数,建立了双叶旋流湿式除尘器虚拟样机。最后,设计搭建湿式除尘器除尘效果实验测试平台,对最佳参数下湿式除尘器的除尘效率及巷道降尘效果进行测试试验。结果表明:使湿式除尘器除尘效率达到最高的最佳参数方案为:叶片安装角37°、转速1550rpm、喷雾压力1.9MPa、喷雾口径2mm;最佳参数湿式除尘器除尘效率模拟值为97.21%,实测均值为94.80%,最大相对误差为3.91%;巷道回风侧行人呼吸带高度平均粉尘浓度从441.29 mg/m3降低到269.14 mg/m3,降低39.0%,验证了该湿式除尘器的巷道降尘有效性。

     

    Abstract: To address the issue of suboptimal dust removal performance in the swirling wet dust collectors used in fully mechanized excavation face, a dual-blade swirling wet dust collector was designed. Using the functional tree method, the dust collector was determined to consist primarily of an annular spray device, dual swirling blades, and baffle demisting plates. The dual swirling blades provide greater centrifugal force to enhance dust removal efficiency. By utilizing the triple dust-capturing effects of the internal atomization zone, swirling zone, and dewatering zone, efficient purification of dust-laden polluted air is achieved. Based on the practical application needs of coal mines, the external dimensions, airflow capacity, and other technical parameters were determined. A numerical simulation method was used to conduct a single-factor analysis of the effects of nozzle diameter, spray pressure, blade installation angle, and blade rotation speed on the dust removal efficiency of the wet dust collector. Through response surface methodology, a multiple regression equation was established between dust removal efficiency and each influencing factor, identifying the optimal parameters that maximize dust removal efficiency. A virtual prototype of the dual-blade swirling wet dust collector was then developed. Finally, an experimental testing platform was designed and constructed to evaluate the dust removal efficiency of the wet dust collector and its dust reduction performance in mine tunnels under optimal parameters. The results indicated that the optimal parameter scheme for maximizing dust removal efficiency was: blade installation angle of 37°, rotation speed of 1550 rpm, spray pressure of 1.9 MPa, and nozzle diameter of 2 mm. The simulated dust removal efficiency under these optimal parameters was 97.21%, with an average measured efficiency of 94.80%, and a maximum relative error of 3.91%. The average dust concentration at the breathing height on the return air side of the tunnel decreased from 441.29 mg/m3 to 269.14 mg/m3, a reduction of 39.0%, validating the effectiveness of this wet dust collector in reducing dust in mine tunnels.

     

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