A new design of foam spray nozzle used for precise dust control in underground coal mines |
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| Affiliation: | 1. College of Safety Science and Engineering, Liaoning Technical University, Huludao 125105, China;2. Faculty of Safety Engineering, China University of Mining & Technology, Xuzhou 221116, China;1. School of Mines, China University of Mining & Technology, Xuzhou 221008, China;2. Key Laboratory of Deep Coal Resource Mining Ministry of Education, China University of Mining & Technology, Xuzhou 221008, China;1. School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China;2. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou 221116, China;3. Key Laboratory of Gas and Fire Control for Coal Mines of Ministry of Education, China University of Mining and Technology, Xuzhou 221116, China |
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| Abstract: | In order to improve the utilization rate of foam,an arc jet nozzle was designed for precise dust control.Through theoretical analysis,the different demands of foam were compared amongst arc jets,flat jets and full cone jets when the dust source was covered identically by foam.It is proved that foam consumption was least when an arc jet was used.Foam production capability of an arc jet nozzle under different conditions was investigated through experiments.The results show that with the gas liquid ratio(GLR)increasing,the spray state of an arc jet nozzle presents successively water jet,foam jet and mist.Under a reasonable working condition range of foam production and a fixed GLR,foam production quantity increases at first,and then decreases with the increase of liquid supply quantity.When the inner diameter of the nozzle is 14 mm,the best GLR is 30 and the optimum liquid supply quantity is0.375 m~3/h.The results of field experiments show that the total dust and respirable dust suppression efficiency of arc jet nozzles is 85.8%and 82.6%respectively,which are 1.39 and 1.37 times higher than the full cone nozzles and 1.20 and 1.19 times higher than the fiat nozzles. |
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| Keywords: | Dust control Precise spray Arc jet Gas liquid ratio (GLR) Dust suppression efficiency |
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