Introduction to the Features of Coal Mine Safety Monitoring System

The coal mine safety monitoring system is mainly used to monitor methane concentration, carbon monoxide concentration, carbon dioxide concentration, oxygen concentration, hydrogen sulfide concentration, mine dust concentration, wind speed, wind pressure, humidity, temperature, feed status, damper status, fan status, local Ventilator start and stop, main fan start and stop, etc., and a system that realizes the functions of methane over-limit sound and light alarm, power failure and methane wind power blocking control.

1. System requirements for coal mine safety monitoring system

The State Council promulgated the "Notice on Further Strengthening Enterprise Work Safety" (Guo Fa [2010] No. 23) and the State Administration of Work Safety and the National Coal Mine Safety Supervision Bureau promulgated the "Six Major Systems on Building and Perfecting Underground Coal Mine Safety Avoidance" The "Notice" requires coal mines across the country to install monitoring and monitoring.

system, underground personnel positioning system, emergency avoidance system, compressed air self-rescue system, water supply rescue system and communication system and other technical equipment. Among them, it is required to build and improve the mine monitoring and monitoring system, and give full play to its early warning function of safety and risk avoidance.

2. System characteristics of coal mine safety monitoring system

The underground coal mine is a special working environment, with flammable, explosive, combustible and corrosive gases, humidity, water, large mine dust, large grid voltage fluctuations, serious electromagnetic interference, narrow space, and long monitoring distance. Therefore, the mine monitoring system is different from the general industrial monitoring system. Compared with the general industrial monitoring system, it has the following characteristics:

2.1 Electrical explosion-proof;

2.2 Long transmission distance;

2.3 The network structure should adopt a tree structure;

2.4 The monitored objects change slowly;

2.5 The grid voltage fluctuates greatly and the electromagnetic interference is serious;

2.6 Poor working environment;

2.7 Sensors (or actuators) should use remote power supply;

2.8 Repeaters should not be used.

3. System composition of coal mine safety monitoring system

The mine monitoring system generally consists of sensors, actuators, substations, power boxes (or electric control boxes), master stations (or transmission interfaces), hosts (including monitors), system software, servers, printers, large screens, UPS-power supplies, It consists of remote terminal, network interface cable and junction box.

3.1 The sensor converts the measured physical quantity into an electrical signal, and has display and sound and light alarm functions (some sensors do not have display or sound and light alarm functions);

3.2 The actuator (including sound and light alarm and display equipment) converts the control signal into the controlled physical quantity;

3.3 The substation receives the signal from the sensor, and transmits it to the main station (or transmission interface) according to the pre-agreed multiplexing method, and at the same time, receives the multiplexed signal from the main station (or transmission interface). The substation also has simple data processing capabilities such as linearity correction, overrun discrimination, logic operation, etc., processes the signal input by the sensor and the signal transmitted by the master station (or transmission interface), and controls the work of the actuator;

3.4 The power box converts the AC grid power into the intrinsically safe DC power required by the system, and has a battery that can maintain the normal power supply for not less than 2 hours after the power grid is cut off;

3.5 The transmission interface receives the signal sent by the substation at a long distance, and sends it to the host for processing; receives the signal from the host, and sends it to the corresponding substation (the transmission interface also has the functions of controlling the sending and receiving of the substation, and the modulation and demodulation of the multiplexed signal , system self-test and other functions;

3.6 The main engine is generally selected from industrial control microcomputer or ordinary microcomputer, dual-machine or multi-machine backup. The host is mainly used to receive monitoring signals, calibration, alarm discrimination, data statistics, disk storage, display, sound and light alarm, man-machine dialogue, output control, control printout, networking, etc.

4. Host of coal mine safety monitoring system

Generally, industrial control microcomputers or ordinary microcomputers, dual-machine or multi-machine backup are used. The host is mainly used to receive monitoring signals, calibration, alarm discrimination, data statistics, disk storage, display, sound and light alarm, man-machine dialogue, output control, printout control, and management network connection, etc.

4.1 Abnormal power supply

The power supply status of the controlled equipment is inconsistent with the power off or power on command issued by the system.

4.2 Gas mine

As long as gas is found in one coal (rock) layer, the mine is a gas mine. Gas mines are managed according to mine gas grades and are divided into low gas mines, high gas mines and coal and gas outburst mines.

4.3 Portable methane detection and alarm device

Portable instrument with digital display of methane concentration and over-limit alarm function.

4.4 Digital methane alarm miner's lamp

The utility model relates to a portable lighting fixture with an alarm function for exceeding the limit of methane concentration.

The establishment and installation of safety monitoring and monitoring systems in coal mines must comply with the "Management Regulations for the Use of Coal Mine Safety Monitoring Systems and Testing Instruments".

5. Training of coal mine safety monitoring system

About the Office of the State Coal Mine Safety Administration

Carry out the use of coal mine safety monitoring and monitoring system

Notice of special training for relevant personnel

Coal Safety Supervision Office [2015] No. 4

The coal mine safety supervision departments and coal industry management departments of all coal-producing provinces, autonomous regions, municipalities directly under the Central Government and Xinjiang Production and Construction Corps, all provincial coal mine safety supervision bureaus, and relevant central enterprises:

In order to implement the spirit of the National Safety Production Work Conference, further strengthen the responsibility awareness of relevant personnel in the use of the coal mine safety monitoring and monitoring system and the concept of zero gas overrun, and improve their ability to use, maintain, and manage the coal mine safety monitoring and monitoring system and emergency response and disposal capabilities, the National Coal Mine The Bureau of Safety Supervision decided to carry out special training for all kinds of coal mining enterprises across the country and their coal mine dispatching room leaders, dispatchers, safety monitoring and monitoring system watchmen and maintenance center leaders. The relevant matters are hereby notified as follows:

5.1 Training organization

5.1.1 Focus on independent training of coal mining enterprises, and coal mining enterprises that do not have training conditions (no special venue, equipment, teacher management team, etc.) can entrust local qualified training institutions to conduct training.

5.1.2 The examination and certification departments of provincial coal mine safety management personnel are responsible for formulating the implementation opinions of special training work in the region, and putting forward requirements for curriculum setting, teacher selection and employment, performance evaluation, etc.

5.2 Training time

Completed special training from May to September 2015. Classes can be held in installments, with each training period lasting 2-3 days.

5.3 Main content of training

The basic conditions and main job responsibilities of relevant personnel in the dispatching (monitoring) post; the principle, composition and performance of the coal mine safety monitoring and monitoring system, daily maintenance, fault diagnosis and troubleshooting, etc.; the monitoring system alarm and underground emergency disposal and response measures; Major disasters in coal mines and their prevention and control; emergency plans and drills for coal mines in the region, etc.

5.4 Relevant requirements

5.4.1 The examination and certification departments of provincial coal mine safety management personnel shall submit their opinions on the implementation of special training work in the region to the Administrative Department of the National Coal Mine Safety Supervision Bureau before the end of April, and strengthen the supervision and inspection of special training, focusing on the inspection of training content , Time, and whether the assessment meets the requirements, and supervise and urge those who fail the assessment to adjust their positions. Conscientiously summarize good experience and practices, analyze common and major problems, and put forward relevant opinions and suggestions. During the special training process, if any major problems are found, they should be reported in time.

5.4.2 Each coal mining enterprise shall formulate special training plans and establish special training files according to the implementation opinions of the region, and immediately adjust the positions of those who fail the training assessment. The training plan, training situation and post adjustment shall be reported to relevant provincial departments in a timely manner.

5.4.3 The provincial coal mine safety management personnel assessment and certification department shall submit the training summary materials and statistical tables (the electronic format can be downloaded from the government website of the State Administration of Work Safety) together with the electronic version to The Administrative Department of the State Bureau of Coal Mine Safety; before October 15, submit the summary report on the training situation and the statistical table together with the electronic version to the Administrative Department of the State Bureau of Coal Mine Safety. The State Bureau of Coal Mine Safety will organize two key supervision and inspections on the development of special trainings in July and September, and will summarize and report on the special trainings in late October.