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Experimental characterization of multi-nozzle atomization interference for dust reduction between hydraulic supports at a fully mechanized coal mining face

  • Jiayuan Wang
  • Gang ZhouEmail author
  • Xing Wei
  • Shicong Wang
Research Article
  • 55 Downloads

Abstract

To analyze the distribution pattern concerning multi-nozzle interference spray particle granularity between hydraulic supports, the present study conducts atomization interference experimental characterization for three types of nozzles used in coal mines based on a Doppler laser interference spray dust suppression simulation experimental system. The results indicate that for single-nozzle atomization, the impact of spray pressure on spray droplet size is gradually subdued, and a spray pressure of 8 MPa yields the best result; compared with single-nozzle spray, the multi-nozzle atomization interference effect can downsize the spray field overlapping zone, leading to an improved uniformity of overall spray particle distribution. As the spray field overlapping coefficient k increases, the particle size of the interference spray field decreases first and then increases. As the spray field overlapping coefficient reaches 0.4, the distribution of spray droplet size is most concentrated, corresponding to the optimal atomized dust suppression effect. Practical testing indicates that the optimal spray field overlapping coefficient measured at a fully mechanized mining face agrees well with the experimental result. Under the optimal parameters, the average total dust and respirable dust suppression rates measured at various measuring points on the downwind side during support relocation reach 78.93% and 80.53%, respectively.

Keywords

Hydraulic support Multi-nozzle Atomization interference Spray field overlapping coefficient Spray droplet size 

Notes

Funding information

This work was financially supported by the National Key Research and Development Program of China (Grant No. 2017YFC0805202), the National Natural Science Foundation of China (Grant Nos. 51774198, 51474139), the Outstanding Youth Fund Project of Provincial Universities in Shandong Province (Grant No. ZR2017JL026), the Qingdao City Science and Technology Project (Grant No. 16-6-2-52-nsh), the Natural Science Foundation of Shandong Province (Grant No. ZR2016EEM36), and the Qingdao Postdoctoral Applied Research Project (Grant No. 2015194).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Jiayuan Wang
    • 1
    • 2
  • Gang Zhou
    • 1
    • 2
    Email author
  • Xing Wei
    • 1
    • 2
  • Shicong Wang
    • 1
    • 2
  1. 1.College of Mining and Safety EngineeringShandong University of Science and TechnologyQingdaoChina
  2. 2.State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and TechnologyShandong University of Science and TechnologyQingdaoChina

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