China News Service, March 15. According to the website of the State Administration of Mine Safety, the State Administration of Mine Safety recently issued a notice on further strengthening the safety management of coal mines and coal bunkers (hereinafter referred to as the "Notice").
The notice mentioned that coal bunker safety supervision and inspection should be strengthened.
Coal mine safety supervision and inspection departments must strictly enforce the law, urge coal mines to implement coal bunker safety management responsibilities, comprehensively investigate and manage hidden dangers, resolutely crack down on illegal operations in coal bunkers, and strictly prevent various coal bunker accidents.
The full text of the notice is as follows:
About the National Mine Safety Supervision Bureau
Notice on further strengthening safety management of coal mines and coal bunkers
Coal mine safety supervision departments of all provinces, autonomous regions and Xinjiang Production and Construction Corps, provincial bureaus of the State Mine Safety Supervision Bureau, and relevant central enterprises:
In order to thoroughly implement the spirit of General Secretary Xi Jinping’s important instructions on production safety, learn lessons from the accident, and effectively strengthen the safety management of coal bunkers (including coal holes, gangue holes, and gangue bunkers, hereinafter collectively referred to as coal bunkers), we are hereby notified of relevant matters. as follows:
1. Consolidate coal mine safety responsibilities
(1) Strictly implement the safety responsibilities of coal mine leaders and relevant departments.
Coal mines should clarify the leaders in charge of coal bunker safety management and the specific leading management departments, clarify the safety responsibilities of mechanical and electrical management, production technology, safety management, ventilation, dispatching and other departments, and clarify the safety management responsibilities and responsible persons of each coal bunker specific user unit.
(2) Improve relevant systems.
Coal mines should establish and improve coal bunker management systems, including design, construction, safety management, daily inspections, inspection and maintenance, risk identification, hidden danger investigation, emergency response, supervision and inspection, prevention of bunker blockage and collapse, suspension and reuse management, etc., and Conduct regular safety inspections.
2. Accelerate coal bunker design optimization and mechanization transformation
(1) Innovative warehouse design.
Coal mines should strictly follow the requirements of relevant design specifications and carry out reasonable design based on the surrounding rock characteristics, coal bunker capacity, etc. Carry out engineering design innovations in coal bunker drainage holes, preset cleaning and dredging devices, etc., to enhance the coal bunker's ability to prevent blockage and collapse.
(2) Improve the storage system and equipment.
It is strictly prohibited to place the coal pit or operating platform directly at the lower entrance of the coal bunker. A sufficient safe distance should be maintained between the two or reliable isolation measures should be taken. In inclined tunnels, the coal pit or operating platform should be arranged uphill in the tunnel. direction.
Promote the application of anti-collapse silo gates and other devices in the coal feeding system.
Accelerate the implementation of remote control transformation of the coal feeder at the bottom of the coal bunker to achieve unattended operation.
(3) Accelerate the research and development and application of unmanned chemical warehouse exploration, warehouse clearance, and dredging technology and equipment.
Accelerate the research and development and application of robots in daily inspection, cleaning and unblocking of coal bunkers, implement mechanization and robotization transformation, and realize unmanned operations as soon as possible.
3. Strengthen coal bunker construction management
(1) Strengthen construction risk management and control.
Coal mines should select professional teams with strong safety management capabilities and rich construction experience.
Before construction, risk analysis and assessment of hazardous factors such as falling from height, equipment instability, toxic and harmful gases, etc. should be carried out, special operating procedures should be prepared, and strict safety technical measures should be formulated.
(2) Strengthen supervision of the construction process.
It is necessary to urge the construction units to strictly follow the coal bunker construction operating procedures to carry out construction.
When using a raise drilling rig to excavate a coal bunker, personnel are strictly prohibited from staying, passing, observing or discharging slag below during the hole expansion operation.
Clean the gangue in the gangue hole in time to prevent the hole from being blocked.
Special measures must be taken to deal with blocked holes.
It is strictly prohibited to work while standing on the gangue in the gangue hole.
4. Strengthen daily management and maintenance
(1) Strengthen safety warnings and facility configuration.
Obvious safety warning signs should be set up near coal bunkers to indicate existing risks and control measures.
The upper entrance of the coal bunker must be equipped with safety facilities to prevent people and materials from falling.
(2) Strengthen monitoring and control.
Monitoring instruments and equipment such as video, personnel approach warning, infrared thermal imaging, CO sensor, CH4 sensor, coal level meter, etc. should be installed around the coal bunker, and should be connected to the mine dispatching system to provide timely alarms for abnormal coal accumulation and other situations.
(3) Strengthen coal flow source and process control.
Coal mines should strengthen the identification and treatment of large pieces of coal gangue and foreign objects in the transportation system. Crusher should be installed at the working surface transfer machine. Iron removers should be installed in the coal flow transportation system. Grate should be installed at the coal bunker entrance. Video AI foreign object identification should be promoted and applied. technology to strictly prevent large pieces of coal gangue, ironware, wood and other debris from entering the coal bunker.
If raw coal has a large moisture content, a coal-water separation device should be installed in the main coal flow transportation system.
(4) Reasonably determine the coal storage location.
The loading capacity and empty capacity of coal bunkers should be controlled within the prescribed range.
When the mine is shut down for maintenance for 24 hours or more, the warehouse must be kept at the lowest position, and emptying without construction tasks is strictly prohibited.
When the coal bunker is not used for a long time, it must be emptied and measures must be taken to prevent short circuit due to wind flow.
(5) Strengthen the management of decommissioning and reuse of coal bunkers.
When a coal bunker is out of service for a long time and is reused, the coal mine must organize on-site inspection and acceptance to confirm that it meets the safety conditions before it can be put into use. It must also formulate a bunker management and control process to monitor the accumulation of water and gas in the coal bunker, water and coal, coal storage bin locations, and coal flow. Conduct a comprehensive inspection of mechanical and electrical equipment along the line to ensure safety before placing the warehouse.
(6) Do a good job in waterproofing the coal bunker.
It is strictly prohibited for the coal bunker to double as a water channel. The top of the coal bunker should be higher than the tunnel floor.
If the raw coal has a large moisture content, measures such as drilling holes at the lower entrance of the coal bunker to intercept and divert the water should be taken.
When there is water in the coal bunker, measures such as blocking, draining, and drainage must be taken. It must not be used unless it is properly handled.
(7) Strengthen the maintenance and management of coal bunker facilities and equipment.
Regularly check the integrity of equipment and facilities, standardize testing and testing, strengthen maintenance and timely overhaul.
Special safety technical measures must be formulated for the maintenance, cleaning, repair and reinforcement of coal bunkers, and the operations must be carried out from top to bottom.
Imaging scanners, cameras and other equipment should be used for detection to prevent people from entering the coal bunker.
If it is really necessary to enter the warehouse for processing, special safety technical measures should be formulated and strictly implemented. Safety monitoring personnel must be deployed on site to strictly prevent accidents such as falling, coal gangue collapse, suffocation, poisoning, and being trapped in coal slime.
When overhauling the coal feeder at the bottom of the coal bunker, a warning should be set up at the top of the coal bunker to prevent coal flow and debris from entering the coal bunker, and emergency measures should be taken to prevent air flow from short circuiting.
5. Strengthen on-site disposal
(1) Strengthen safety risk management and control.
When handling situations such as blockage or collapse on site, it is strictly prohibited to deal with them blindly without authorization. Mine leaders should organize on-site inspections, research and formulate safety technical measures, and construction can only be carried out with the approval of the mine director. During on-site disposal operations, mine leaders must provide on-site supervision and guidance, and equip with Safety monitor personnel and strictly control the number of people working on site.
(2) Standardize the process for handling blocked warehouses.
When dealing with blocked warehouses, priority should be given to using air cannons, ultrasonic waves, fixed mechanical devices, etc. to clear them.
If it is really necessary for personnel to enter the warehouse for processing, entry from below is strictly prohibited. Personnel must wear safety belts throughout the process, and the safety belts must have reliable fixed points to prevent negative pressure from being involved in personnel when the coal bunker is unblocked.
When blasting is necessary, the relevant provisions of the "Coal Mine Safety Regulations" should be strictly followed.
(3) Standardize the liquidation disposal process.
When dealing with a collapsed coal bunker, it is necessary to clarify the operating procedures of the coal feeder gate and the responsibilities of on-site safety monitoring personnel, strengthen the observation of the water and coal positions in the coal bunker and the coal feeder gate, and set up warning lines in the construction area to prevent other personnel from entering by mistake and ensure the construction Personnel positions must be safe and coal feeder gate operations must be standardized to prevent secondary collapse accidents.
6. Strict supervision and inspection
Strengthen coal bunker safety supervision and inspection.
Coal mine safety supervision and inspection departments must strictly enforce the law, urge coal mines to implement coal bunker safety management responsibilities, comprehensively investigate and manage hidden dangers, resolutely crack down on illegal operations in coal bunkers, and strictly prevent various coal bunker accidents.
All provincial coal mine safety supervision departments are requested to immediately forward this notice to all coal mines in their jurisdiction and continue to supervise its implementation.
At the same time, it is necessary to urge all coal mines in the jurisdiction to formulate and strictly implement timetables and roadmaps for the mechanization and automation transformation of coal bunker entrances.
State Mine Safety Supervision Bureau
March 14, 2024