A new design of foaming agent mixing device for a pneumatic foaming system used for mine dust suppression |
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| Affiliation: | 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;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, Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, China University of Mining and Technology, Xuzhou 221116, China;2. School of Civil, Mining and Environmental Engineering, University of Wollongong, Wollongong, NSW 2522, Australia;3. Mining Consultant (Underground Coal), Wollongong, NSW 2522, Australia;1. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology, Xuzhou 221008, China;2. Key Laboratory of Gas and Fire Control for Coal Mines, China University of Mining & Technology, Ministry of Education, Xuzhou 221008, China;3. School of Safety Engineering, China University of Mining & Technology, Xuzhou 221116, China |
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| Abstract: | To overcome the drawbacks of the conventional foam technology used for dust suppression,including large pressure loss,high water pressure and low driving pressure,a new pneumatic foaming system is introduced.Then an original design of foaming agent mixing device is proposed,and its performance is investigated and evaluated under different pressure compensations.Experimental results show that the maximum absorption amount increases by 2.9-6.7 times at a pressure compensation of 0.04-0.2 MPa compared with no pressure compensation.The pressure loss and pressure fluctuation both reduce significantly with increasing pressure compensation.The critical outlet pressure increases by30.4-240%.Field application indicates that the proposed mixing device ensures the reliable addition of foaming agent used for foam dust suppression.The effect of foam on dust suppression is remarkable,and the economic cost of foam is low.Therefore,there is reason to believe that the new mixing device will greatly promote foam technology to be widely used for suppressing dust in underground coal mines. |
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| Keywords: | Compressed air Jet Pressure compensation Foam Dust suppression |
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