Layout of Buried Pipe Drainage in the Goaf under Y-Type Ventilation
Authors
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School of Safety Science and Engineering, Henan Polytechnic University, Collaborative Innovation Center of Coal Safety Production of Henan Province, Jiaozuo Henan 454 000 ,CN
Haidong Chen -
School of Safety Science and Engineering, Henan Polytechnic University ,CNFenghua An
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School of Safety Science and Engineering, Henan Polytechnic University ,CNZhaofeng Wang
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School of Safety Science and Engineering, Henan Polytechnic University ,CNHongmin Yang
Keywords:
Y-Type Ventilation, Gas Overrun, Gas Drainage, Numerical Simulation.Abstract
Y-type ventilation is commonly used in coal mines of many countries in recent years. Due to the lack of leakage airflow return roadway in the deep part of the goaf under Y-type ventilation, gas with high concentration would appear behind the hydraulic supports, which is easily to cause gas overrun accidents. Drainage pipes buried inside the goaf-side roadway retained can change the flow filed in the goaf and is commonly used to reduce the danger of gas overrun behind the hydraulic supports of the workface with a high gas emission. Based on the engineering practice of Xingwu coal mine in China, Fluent numerical simulation software was used to determine the reasonable mixed gas drainage volume of drainage pipes buried inside the goaf-side roadway retained. Then, taking into account the use of a single drainage pipe required larger diameter, and easy deformation, affecting the gas drainage effect; three drainage pipes instead of a single drainage pipe are arranged into the goaf-side roadway retained. Finally, through the field test, the rationality of the gas drainage volume and the layout of drainage pipes being selected are verified.
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