Research On Working Environment Of Coalmine Refuge Chamber And Heat-insulation And Anti-explosion Properties Of Chamber Structure

In our country, there is a high rate of coalmine accidents leading to a largenumber of casualties and property losses. The government attaches great importanceto this aspect and issues a regulation to equip coalmine with mine refuge chamberand rescue capsule in short time, aiming to improve our coal mine safety technologylevel totally. Nowadays, the research and designing process of mine rescue capsule isstill in the initial stage while relating research materials are rare and mine refugechamber field standard has not been formed. In the meantime, as it is quite difficultto carry out real roadway explosion experiment due to its high experiment cost, mostof mine refuge chamber in our country refer to foreign products with no relatingtheory support and poor portability, and thus the mine refuge chamber enjoys highconstruction cost, poor practical applicability and no easy way to get popularized. Inorder to design and produce a mine refuge chamber both safe and economic, we mustget down to theory on the basis of clarifying the working environment of mine refugechamber to form a thorough set of designing methods of mine refuge chamber.This paper combines theoretical analysis, numerical simulation and experiment-al analysis to analyze the roadway environment after gas explosion，obtaining thechanging law about overpressure and temperature of roadway at the instant ofexplosion and the time-changing law of temperature inside roadway after explosionwhich are applied in the research on heat-insulation performance and anti-explosionof refugee chamber and give reference for the design and optimization of mine refugechamber.Firstly, this paper analyzes the gas explosion transmission process theoreticallyand simulates the explosion of the gas explosion process with Fluent software. In themeantime, this paper proposes a correction method to compute overpressure of gasexplosion on the basis of gas explosion dynamics strong shock wave theory, obtainsthe distributing rules of overpressure and temperature in the roadway at the instant ofexplosion and compares these results with experimental results, which can provideinitial condition for further analyzing of the air’s spatial and temporal distribution inthe roadway.Secondly, in the part of temperature changing law after coalmine explosioninside roadway, this paper gets the time-changing curve of air temperature on thebasis of thermodynamic equation through iterative computation with MATLAB andunsteady coupled heat transfer with Fluent. Comparing the two curves we summarizethe temperature changing law after coalmine explosion.Thirdly, the insulating properties of mine refuge chamber are analyzed by Fluent numerical simulation. This paper simulates the heat insulation performance of thechamber under different thickness of insulation material, different placed positioninside roadway and different fixed mode, and utilizes hear-insulating experiment totestify. Finally on the basis of analysis and actual phenomenon, we present a newchamber structure with variational insulation ability for the first time and providespecified scheme to simulate the insulation effect of this structure.Finally, this paper analyzes anti-explosion properties of mine refuge chamberwith ANSYS workbench. According to the obtained results of structure stress,displacement and strain, we improve the chamber structure continuously and enablethe overall structure of refuge chamber to satisfy the requirements of designparameters. Due to the complexity and uncertainty of explosion shock, there aredifferent degrees and different forms of influence to mine refuge chamber, and thuswe analyze the safety properties of mine refuge chamber in the end.