Abstract: mine ventilation system is an important part of the exploration and production of coal mine, mine is the basic guarantee of safety in production. Its role is to ensure that the underground air location has good air, safety and sanitary conditions to provide a safe and suitable working environment for underground wells. It is also one of the basic means to control accident expansion and rescue and disaster relief after an accident. According to the current situation and existing problems of the ventilation system of Linhua Coal Mine, through the measures of optimizing the ventilation system, strengthening the local ventilation management, and paying attention to the network adjustment of the ventilation system, the safety hazards such as gas are eliminated, the mine disaster prevention and disaster resistance capacity is improved, and the mine is ensured. Safe Production. At present, there are many types of coal mine accidents in China, but there are always certain development rules in the interior. Accident statistics found that any serious accidents can be caused by the management of the ventilation system, or the ventilation system is unreasonable, or the ventilation system itself is not completely formed, resulting in serious accidents including gas explosion and coal dust explosion. Therefore, a reasonable ventilation system is extremely important to ensure the safe production of coal mines. Reasonable mine ventilation system uses ventilation power to provide sufficient fresh air to all underground wind locations in the most economical way, providing suitable temperature and humidity, and maintaining good climatic conditions to ensure the safety of underground workers. And to improve the needs of the labor environment, take the actual mine ventilation, mine ventilation methods and mine ventilation network. It also requires timely and effective control of wind direction and air volume in the event of a disaster, and cooperates with other measures to control the accident within a certain range to prevent disasters from entering. Expand in one step. Linhua Coal Mine adopts draw-out ventilation, mine ventilation system is divided ventilation, and two main ventilation fans are installed in the return air wells of the first and second mining areas. The motor power is 2×280KW, one of which is used and one is reserved. The wind tunnel or two sets of reliable pedestrian dampers are constructed in the connecting lane between the inlet tunnel and the return air tunnel. The forward and reverse anti-slip dampers are constructed at the opening of the tunneling face to achieve independent ventilation. The 13 groups of the gusts and the 7 groups of the local fan have realized the double power supply of the dual fan and can be reliably switched to realize the wind power lock. Switch tests are performed for each shift. The ventilation system is reasonable. The mine ventilation system is the general term for the mine ventilation mode, ventilation method and ventilation network. The ventilation system is composed of inlet and return air wells, main fans and their attachments, ventilation network and ventilation structures. Contact and influence each other. Therefore, when analyzing the ventilation system, it cannot be considered from one element alone, and must be considered as a whole from the ventilation system. In the technical transformation of the production of the ventilation system of the mine, not only must the advanced nature of the new system be taken into account, but also the existing ventilation shafts and ventilation equipment should be fully utilized to coordinate the new and old ventilation systems to ensure the old and new areas. Safe production constitutes a reasonable new ventilation system, which is a concrete embodiment of the ventilation system. 1. The ventilation system in the mine production stage must meet the following requirements: (1) Strictly regulate the production system. When the ventilation system, production process, and mine modification and expansion affect the change of mine ventilation capacity, the mine ventilation capacity must be verified, and the phenomenon of super-ventilation production must be avoided. (2) Strengthen the management of mine ventilation facilities, improve the quality of facilities such as airtight, damper and windshield wall, reduce the air leakage to optimize the ventilation system, and ensure the stability of the mine ventilation system. At the same time, ventilation structures and air volume adjustment facilities should be minimized as much as possible. To facilitate the management of the reliability of the ventilation system. (3) Strengthen the local ventilation management. The local ventilator plays a vital role in ensuring the normal and safe production of the mining face. Various measures should be taken to minimize or avoid the occurrence of power failure and wind stoppage of the local ventilator. For the local ventilator, "three special two locks" must be implemented. (4) Try to avoid the arrangement of non-straight roadways such as sudden expansion, sudden expansion or sharp turn of the roadway, and regularly clean and maintain the return airway to prevent the falling roof from blocking the roadway, ensuring reasonable ventilation section and reducing ventilation resistance. To ensure smooth flow. Our mine specifically repaired the south return wind lane of our mine at the beginning of this year. The effect is very significant to reduce the ventilation resistance of the mine. (5) Regularly optimize the ventilation system, measure the ventilation resistance, timely grasp the distribution of ventilation resistance of the mine, and adopt scientific and reasonable air volume adjustment measures to ensure the normal supply of wind at the wind location. (6) The auxiliary function of the monitoring system is not neglected in the management of the mine ventilation system. Various parameters such as CH4 concentration (gas concentration), CO content, equipment opening and closing, damper opening and closing, wind speed, etc. are arranged in each roadway and working surface. Real-time monitoring, in order to monitor and understand the situation of the underground ventilation system in real time, and timely grasp the relevant information, so as to take corresponding measures. (7) Carry out reliability evaluation of the mine ventilation system, thereby improving the safety and reliability of the mine ventilation system and enhancing the prevention and resilience to accidents. Second, the management of hidden dangers of ventilation accidents 1. Strengthen the inspection of hidden dangers of ventilation accidents In the case of hidden dangers of ventilation accidents, the unsafe factors in ventilation can be found in time, and the phenomenon of “three violations†(violation of rules, illegal operation, violation of labor discipline) is stopped, and the accident is eliminated in the bud, which is of great significance for the safe production of coal mines. Generally used for the inspection of hidden dangers in coal mine ventilation, there are safety checklists, analysis of accident trees, risk analysis using the safety, health and ring management systems that are currently implemented in mines. The more common methods are used, and the application value is the safety checklist. Law, safety, health, ring risk identification and risk pre-control measures are most effective. Take the hidden danger investigation of tunneling and ventilation accident as an example to introduce how to organize hidden danger inspection. 2. Excavation of hidden dangers in ventilation accidents The local ventilation fan is often used for ventilation, and accidents occur due to reliability interference. According to the analysis of coal mine accident data in the past, gas and coal dust explosion accidents in the tunnel face accounted for 60% to 70% of the total number of accidents. Therefore, it is necessary to strengthen the safety management and inspection of tunneling ventilation. (1) Inspection focus: First, the completeness of the ventilation system. Use local fan ventilation or full air pressure ventilation, and diffusion ventilation is prohibited. Second, the reliability of ventilation. Third, the status of the series of ventilation safety equipment. (2) Inspection contents: First, whether to use a low noise fan or install a silencer. Second, whether the ventilator and its switch are installed in the air inlet lane, not less than 10m from the back alley. Third, whether the fan produces suction air. Fourth, whether the installation is reliable or not, when installing on the floor of the roadway, the height of the padded stool is not less than 300mm. Fifth, whether it is equipped with a reliable "three special two lock" device. Sixth, mechanical and electrical explosion-proof performance, anti-shock, open and close sensors, fan start and stop, air duct sensor. (3) Inspection method: local ventilation and on-site observation test. 1 Check the air cylinder: Whether to use anti-static flame-retardant air cylinder, whether it is necessary to hang on the ring, to achieve "two by way" (by help, top, straight), whether the different diameter air duct uses a transition section, air duct Whether the joint is leaking, whether there is a break, whether it is repaired in time. 2 Check the ventilation management and dust control of the excavation: check the excavation operation procedures, the local ventilator operation record, the wind stop record, and carry out the actual on-site inspection. 3 Fill in the safety checklist for the hidden dangers of tunneling accidents. 3. Establish mine information management system for mine ventilation accidents The system includes: 1 mine ventilation system condition assessment. Evaluate hidden dangers of all mine ventilation accidents, including demonstration of ventilation system, stability analysis, district ventilation, effective air volume, and ventilation resistance. 2 Evaluation of mine ventilation facilities. Including reliability, quality inspection, etc. 3 Ventilation measures assessment. The coal mining face, the ventilation effect of the tunneling face, the feasibility and effect analysis of the whole mine anti-wind. 4 ventilation system 4. Analysis and evaluation of special issues. Such as the possibility of catastrophic changes such as circulating wind, tandem wind, angular joint roadway, no wind or breeze. 5 to assess the overall stability and resilience of the mine ventilation system disaster prevention system. The ventilation accident hidden danger management system can help technicians to comprehensively search for hidden dangers of various accidents from the perspective of ventilation, thereby improving the overall ventilation capacity and disaster resistance of the mine. In short, to do a good job in ventilation system and safety quality standardization management, the most important thing is to strengthen the ventilation system management, optimize the ventilation system and reduce the ventilation resistance. Safeguarding coal mine safety production, safety is the mainstay, prevention is the mainstay, and ventilation management is one of the main ways to eliminate and reduce the occurrence of secondary accidents in coal mine accidents or coal mine control accidents. Analysis of ventilation safety management, vigorously promote new methods of ventilation system management, and new technology has laid a good foundation for coal mine safety management. 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All kinds of accidents are caused by hidden dangers. Some management personnel at the scene have turned a blind eye to the hidden dangers of mine accidents. Therefore, the focus of ventilation management should be to manage hidden dangers and prevent them from happening.