诱导气流对转载点雾化特性影响规律的数值模拟与试验

发布时间：2018-07-31 13:03

【摘要】：为了分析煤矿转载点诱导气流对喷雾降尘过程中雾化粒度的影响,采用计算流体力学(computational fluid dynamics,CFD)离散相模型的粒子跟踪技术,模拟了不同诱导气流条件下雾滴粒径的分布特性。分析结果表明:在诱导气流的影响下,雾滴颗粒向导料槽出口漂移明显,粒径统计项D[3,2]和D[4,3]随诱导气流风速的增加而减小,减幅分别为17.17%和16.19%;同时,雾化压力的增大,提高了雾滴颗粒发生二次破碎的强度,导致雾化粒度随压力的增大而减小。根据结论,对转载点高压喷雾降尘系统进行了改进,现场喷雾压力由1.5 MPa提高到6.2 MPa,调整雾化场轴向横截面与诱导气流方向之间呈30°夹角,现场实践表明:相对于改进前,转载点全尘浓度和呼吸性粉尘浓度分别降低了88.60%和78.96%。
[Abstract]:In order to analyze the influence of induced airflow at transfer point on atomization particle size in the process of spray dust reduction, particle tracking technique based on the discrete phase model of computational fluid dynamics (computational fluid) was used to simulate the particle size distribution characteristics of droplets under different induced airflow conditions. The results show that under the influence of induced air flow, the exit drift of droplet guide tank is obvious, and the statistical items D [3n 2] and D [4N 3] decrease by 17.17% and 16.19% respectively with the increase of induced wind velocity, and the atomization pressure increases. The strength of the second breakup of droplet particles is increased, and the atomization particle size decreases with the increase of pressure. According to the conclusion, the high pressure spray dedusting system at the transfer point was improved, the field spray pressure was increased from 1. 5 MPa to 6. 2 MPa, and the angle between the axial cross section of the atomization field and the induced airflow direction was adjusted 30 掳. The field practice shows that: compared with before the improvement, The total dust concentration and respiratory dust concentration were decreased by 88.60% and 78.96%, respectively.
【作者单位】：辽宁工程技术大学安全科学与工程学院;矿山热动力灾害与防治教育部重点实验室;
【基金】：国家自然科学基金资助项目(51274116)
【分类号】：TD714.4

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