Numerical Simulation Study on Dynamic Pressure Relief Process of New Spare Explosion-Proof Door
Underground explosion accidents generally occur multiple intermittently.When the first violent explosion causes the explosion-proof door of the coal mine shaft to deform and fail,the spare explosion-proof door can quickly respond and close the pressure relief path,preventing more serious consequences due to short circuit of the main fan.A new type of spare explosion-proof door was introduced.When multiple explosions occur,the pressure relief form on the spare explosion-proof door can automatically open and reset,ensuring the normal ventilation of themine during the catastrophe.The computational fluid dynamics(CFD)was used as the main research tool to analyze the safety and reliability of spare explosion-proof doors under the explosion impact of gas or coal dust explosions.The numerical simulation results show that:the pressure relief form of the spare explosion-proof door can complete the pressure relief within 12 ms under the explosion impact.The spare explosion-proof door can withstand the overpressure impact of 0.8 MPa without being damaged.The structure of the spare explosion-proof door is simple and reliable,and it can be automatically reset by relying on its own gravity to achieve intrinsic safety.
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