Problems and improvements in the use of safety mon

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Problems and improvements in the use of mine safety monitoring system

coal mine gas monitoring device is an important equipment to ensure coal mine safety production. According to the statistics of the former Ministry of coal industry, there are 260 sets of mine safety monitoring systems nationwide, including 9604 local gas sensors, 935 wind speed sensors and 268 co sensors. There are 7123 Registered Gas telemetering and power-off instruments and 74583 portable gas detectors. There are 2578 gas and oxygen dual-purpose detectors, 17176 gas alarm miner's lamps and 55142 optical gas detectors. These gas detection (monitoring) devices have played an important role in preventing gas accidents. However, in recent years, gas accidents, especially heavy and extra large gas explosion accidents, have occurred many times in state-owned key coal mines equipped with mine safety systems, causing many casualties and heavy losses. There are many reasons, but it is closely related to the problems in the use and management of mine safety monitoring system

1 problems existing in the use of mine safety monitoring system

1.1 incomplete parts

according to a statistics of the former Ministry of coal industry, 168 sets of systems have been equipped with incomplete parts, mainly including missing head, broken waist and small tail. That is, there are not enough gas sensor devices in the mining face, return air duct and other places that should be equipped with gas sensor devices, resulting in head shortage; Among the installed gas sensors in the mining face, 009 should be connected but not disconnected. Set up the electric control of the made in China 2025 Industrial Development Fund, which cannot automatically cut off the power supply of electromechanical equipment when the gas exceeds the limit; 981 sensor signals were not transmitted to the ground central station, so that the relevant personnel on the ground could not directly understand the gas situation in the relevant underground locations, resulting in waist breakage; The ground central station equipment of two systems was damaged, and the system lost the functions of gas data telemetry and recording, and some systems were not equipped with standby computers, resulting in the phenomenon of less tail. These phenomena lead to the failure to give full play to the role of safety monitoring system in preventing gas accidents. For example, the direct cause of the catastrophic gas explosion accident in the third well of a mine in Liaoyuan Mining Bureau is: the roof of the coal mining face is pressed, and a large amount of gas is emitted from the goaf. The airflow carrying high concentration of gas passes through a winch chamber. Just when the winch is started, the friction sparks appear on the steel wire rope to detonate the gas. It is precisely in this air path that there is no gas monitoring probe installed, and the power supply of electrical equipment cannot be automatically cut off when the gas exceeds the limit, This is the hidden danger buried by the phenomenon of missing head

1.2 the utilization rate of system components is low

according to the statistics of the former Ministry of coal industry, this is also an aspect of the production control system. In recent years, the utilization rate of gas sensors (the ratio of the number of used to the number of registered) is only 51.6%

1.3 work with disease

some mine safety monitoring systems are not well managed and used, the maintenance is not timely, and the measured data is not displayed, the display is negative or the display is unstable. In some systems, the computer crashed, causing the loss of monitoring data or the loss of power-off function of the system. For example, the safety monitoring device of a mine in Huainan failed 19 times in four days from the mid shift on November 9 to the mid shift on November 13, 1997, and the longest failure time was 166 minutes. It could not play its due role, resulting in a catastrophic gas accident on November 13, 1997, killing 88 people. The catastrophic gas explosion accidents in Pingdingshan No.11 mine, Fuxin Wangying mine and Huainan Xieyi mine also exposed such problems

1.4 the quality of the engineering and technical personnel of the monitoring team is not high

the coal mine safety monitoring system is a high-tech developed in recent years. The engineering and technical personnel of the monitoring team should at least have a technical secondary school degree or above, understand the principle, and be able to maintain. However, according to statistics, nearly 50% of the leaders of the national monitoring team have high school degrees and have not received systematic professional training. Many of them are incompetent, resulting in the poor use of the monitoring system and cannot play its due role. However, some engineering and technical personnel in the monitoring team have narrow knowledge, only know electricity but not ventilation, or only ventilation but not electricity

1.5 do not pay attention to the monitoring data, and supervise the free end of the sample and the experimental plate to be clamped on the upper and lower grippers of the peel strength tester respectively. The upper measurement system is in vain

some mine safety monitoring systems are normal and can correctly reflect the gas concentration, but when the gas concentration exceeds the limit and sends an alarm, some personnel, especially the leaders, do not pay attention to it and cannot deal with it according to the relevant regulations, resulting in accidents. For example, a huge gas explosion accident occurred in a mine of Fushun Bureau, killing and injuring dozens of people. During the accident investigation, we checked the gas monitoring records and found that the gas concentration at the accident site often exceeded the limit for a long time, and the relevant personnel neither dealt with it in time, nor cut off the power supply and withdrew people, so its gas monitoring system was in vain. For another example, at about 10 a.m. on June 22, 1995, a mine in Huainan Bureau found that the gas concentration in the upwind roadway of 4462c  13 coal mining face was abnormal, and the gas concentration reached 3%. Although the personnel on duty in the machine room used to report to the monitoring team leader of the ventilation Department and the dispatcher of the ventilation area, the ventilation Department and the ventilation area did not report to the mine dispatching room and the mine leaders as required, nor did they stop operations as required by the coal mine safety regulations to eliminate hidden dangers, Only the tile inspector was sent to check and verify the data, so that the gas in 462c  13 mining face exceeded the limit for 14 hours and was not handled in time, which eventually led to a gas explosion accident, with 125 casualties. This kind of phenomenon, which does not pay attention to gas monitoring data and cannot give full play to the monitoring role of the monitoring system, often occurs in many mines. 1.6 the rules and regulations are incomplete and unclear. The monitoring team of some mines has not established a perfect use, management and maintenance system, and the position is unknown. Some mine chief engineers and other leaders can't adhere to the normal review of gas monitoring data, and can't find problems and eliminate hidden dangers in time

2 improvement measures

in order to give full play to the role of the mine safety monitoring system in ensuring safe production, the following work must be done carefully:

(1) the mining face of high gassy and outburst mines must realize the automatic alarm of gas overrun and cut off the power supply in accordance with the requirements of the coal mine safety regulations and the regulations on the use and management of mine safety monitoring devices. All mining faces that fail to meet the equipment standards cannot be produced

(2) the mine manager and chief engineer must approve the monitoring while approving the ventilation and gas according to the regulations, and take effective measures to deal with it immediately when finding that the gas exceeds the limit, so as to avoid the occurrence of gas accidents

(3) strengthen the management of the monitoring system. In particular, we should implement the organization, improve the quality of personnel, establish and improve various rules and regulations, and improve the level of technical management

all personnel engaged in monitoring work should not only understand the use of safety monitoring instruments, but also understand the basic knowledge of mine ventilation, but also be able to install, debug and troubleshoot. Systematic professional training, such as safety monitoring, communication technology and ventilation safety, must be carried out, and only after passing the examination of relevant departments can they work independently

in technical management, it is necessary to make a good job of one board, two drawings, three procedures, four systems and five records. One board is to set up an instrument and equipment management board. The contents of the board should include three parts: use, standby and to be repaired. The place of use, model and number of the instrument should be in the use column; The second diagram includes the mine ventilation safety monitoring system diagram and the distribution point distribution system diagram; The three procedures include the operating procedures for electricians on duty, the operating procedures for monitoring maintenance workers and the operating procedures for computer maintenance personnel; The four systems are generally scaly, including regular maintenance system, regular debugging system, regular evaluation system and post system; Five records include the incoming acceptance records of equipment and instruments, instrument and equipment accounts, overhaul and commissioning records on the well, underground patrol inspection and verification records, sensor use and maintenance records, and equipment overhaul records in the central monitoring room

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