Study On Gas Disaster Risk Assessment Method And Control Technology Of The High Gas Outburst Mine

Coal is the main energy in our national economy and how to ensure the safe production of coal mines in China has become an important problem affecting the sustainable development of China's economy.The consequences of gas disasters are the most serious in various types of coal production disasters.And the gas disasters often occurring in high gas mines and gas outburst mines.Therefore,reducing the death rate of 100 tons of coal and controlling the gas risk in the production process have become the top priority of safe production.Focusing on the three types of hazard sources affecting coal mine gas disasters,Evaluating the gas risk factors of high gas outburst mines and taking risk response measures based on the assessment results have important means to reduce mine gas accidents in China.It also provides guidance for the development of scientific risk management techniques.This paper takes the high gas outburst mine shaqu coalmine as the research background.Focus on coal mine gas risk and linking theory and practice.In order to reduce the probability of gas accidents,improve the safety production level of mines in all directions,we used engineering,management,information and computer science,and mine safety theory to study gas risk assessment,risk response and risk management and control systems for high gas outburst mines.In order to evaluate comprehensive risk for gas accidents in high gas outburst mines,in the second chapter of this article,according to the typical cases and literature analysis of gas accidents in the past,we investigated on the spot to obtain reliable assessment data.Then based on the three types of risk sources that affect gas accidents constructed a risk assessment system with 50 factor indicators.Based on matter-element extension theory we designed an evaluation model through the risk assessment index system.Taking the three working face of Shaqu coalmine as an example,we calculated the risk evaluation of coal and gas outburst and gas explosion.And get the risk level of each working face.In order to identify key indicator factors affecting gas accidents,we improved the method of obtaining the initial data and the optimal weight value and optimized by adding the weakening operator to the gray prediction theory.A series of measured index factors of the mine were evaluated and ranked based on the method.We pointed out that the mine should respond to the index factors with high correlation in gas explosion disasters through the correlation between risk level assessment and index factors.Based on correlation analysis results of index factors affecting gas explosion disasters in second chapter and in order to cope with the risk of gas over limit in the roadway,and improve the wind volume pass rate,in the third chapter of this article,the"calculation-feedback-regulation"mechanism based on numerical simulation is proposed to obtain the wind resistance of each roadway.By comparing the measured wind volume data,it is verified that the error in the calculation of this mechanism is less than 2.5%.Secondly,we using Ventsim three-dimensional simulation technology to study the modification scheme of ventilation system from a macro perspective and predicted the change of air volume of main fans and wind points after ventilation system isolation and transformation.The drag reduction adjustment by the wind current short circuit method reduces the wind window resistance in the south 9concentrated return airway by 404 Pa,and the air volume in the roadway increases from 1458 m~3/min to 3444 m~3/min.Finally,based on the Fluent simulation technique,the relationship between the opening area of the windshield and the wind resistance is fitted from a microscopic angle.It is determined that the windshield area should be at least 3.28m~2 to restore the rated operating state of the fan.The research provides convenient and accurate engineering technical support for roadway wind resistance measurement and mine ventilation system design.Based on correlation analysis results of index factors affecting gas explosion disasters in second chapter and in order to prevent the consequences of mass deaths and injuries caused by coal mine gas accidents and improve emergency management capabilities,in the fourth chapter of this article,we analyzed the main factors that cause the casualties of the workers in the gas explosion accident,and point out the most important factor is the erosion of toxic and harmful gases.By referring to the principle of crowd evacuation in subway fire,the evacuation time model is set up by comparing the evacuation time of the self-rescuer and the time of the arrival of the disaster in the event of a gas explosion and the safety evacuation coefficient K of personnel evacuation is put forward.Based on the propagation law of the blast wave in the roadway,the safety evacuation coefficient K of the evacuation efficiency and evacuation optimal path calculated by Floyd algorithm,the site location of the escape chamber in the environment of gas explosion was determined.In order to comprehensively improve the daily gas risk management and control capabilities of coal mining enterprises,in Chapter 5 of this paper,the risk response methods formulated in combination with the above two types of key indicators were combined.Integrate the previous gas risk assessment model,ventilation system management and optimal emergency evacuation path into the computer system.The framework of the gas risk management system platform and the steps of data transmission,reception and analysis were designed by comprehensively comparing the data structure and development language used by the coal mine safety management system developed by the predecessors.Based on the mixed programming technology of Matlab and Visual Studio,the shared data center of coal mine gas comprehensive risk warning information system is developed.The gas risk management system platform is implemented in a variety of programming languages and different devices.The effect of dynamic monitoring,identification,assessment,early warning and emergency disposal of gas risk in high gas outburst mines is realized.In the sixth chapter of this article,this paragraph summarizes the research of risk assessment,risk response and risk management system in this paper,and draws the main conclusions,at the same time,the research direction which can be further developed on the basis of this work is put forward.