According coal mine relevant information, as well as a survey of the actual situation of the mine, the mine safety conditions naturally defined as follows:
The normal water inflow of the mine -- m3 / h, the maximum water inflow -- m3 / h.
According to the "Reply on the identification results of the annual mine gas grade" (No.) document, the total gas emission of the mine is -m3/min, and the relative gas emission is -m3/t, which is a gas mine.
According to the self-ignition tendency of coal seams and coal dust explosion identification report, the self-ignition tendency of the coal seam is a class II spontaneous combustion coal seam, and the coal dust is explosive.
The well has no coal and gas outburst phenomenon, the geothermal gradient is less than 3oC/100m, which belongs to the normal temperature zone; the gas gradient is about 55m.
1.2 Methods and procedures for identification of dangerous and harmful factors
Energy and harmful substances are the root cause of dangerous and harmful factors, and they are also the most fundamental risk factors or harmful factors. In general, the greater the capacity of the system, the more harmful factors exist, and the greater the potential danger and harm of the system. On the other hand, as long as production activities are carried out, the corresponding energy and substances (including harmful substances) must be used. Therefore, dangerous and harmful factors are objectively present in any production activity. Due to the huge and complex coal production system, there are not only production hazards and harmful factors, but also serious threats from natural disasters such as water, fire, gas, coal dust and roof. As the level of coal mine equipment continues to improve, the energy use energy The level is also increasing, and the dangers and harmful factors in coal production are far more than the general industrial activities. It is necessary to comprehensively and systematically identify and analyze the dangerous and harmful factors in coal production, and fully understand its dangers. This is the core work of coal mine safety production management, and it is also the top priority of safety evaluation. The identification of hazards and harmful factors is to identify the characteristics of materials, systems, production processes or environments that may cause accidents and cause adverse consequences. Therefore, the identification of dangerous and harmful factors involves two key tasks, one is to identify the consequences of accidents that may occur; the other is to identify the characteristics of the materials, systems, production processes and environment that may cause the accident. The process of identification and analysis of dangerous and harmful factors is shown in the figure.
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