February 19, 2020

Key Points and Difficulties in Coal Mine Gas Explosion Accident Treatment Technology

Gas explosion coal mine disaster is the most serious accidents, with a strong destructive, sudden, often causing heavy casualties and property losses, is the first major "killer" mine. Judging from the national situation (according to relevant statistics), 74% of the major accidents in which more than 10 people died in a coal mine were gas explosions or gas and coal dust explosions. In the process of dealing with gas explosion accidents, there may be multiple gas explosions, which may cause accidents to increase and increase casualties. The reason is that the treatment methods are improper and the points are not accurate. Therefore, understanding and mastering the methods of gas explosion accident handling, grasping its technical points, difficulties, scientific decision-making, and decisive command are of great significance for striving for disaster relief, controlling the scope of accidents, reducing casualties and property losses.

General procedures and principles for the handling of 1 gas explosion accident

In the event of a gas explosion accident in the mine, the underground personnel and property are in an extremely dangerous situation, and it is imperative to organize the rescue as soon as possible. It can be said that it is running against time. However, disaster relief and rescue must also abide by certain principles and procedures to avoid unnecessary loss and casualties caused by blind command and ignorance. The basic principles of disaster relief are: “constrained command, scientific decision-making, coordinated action, safe and fast”. The specific processing procedures are as follows: First, we should try to evacuate the personnel in the disaster area, rescue the victims; cut off the power supply in the disaster area as appropriate; notify the rescue team; quickly set up the disaster relief headquarters, and strictly follow the requirements of the (disaster prevention and treatment plan), set up several rescue teams. Responsible; restore the ventilation system as soon as possible, eliminate the toxic and harmful gases generated by the explosion, and find the victims.

2 major technical difficulties

In the process of dealing with gas explosion accidents, the following technical problems are often encountered, and it is necessary to make timely and decisive judgments:

(1) Should the power supply in the disaster area be cut off after the accident occurs? The power supply may be cut off, causing another explosion. If the power supply is not cut off, the power supply in the disaster area will be damaged. There is a risk of electric shock and sparks at any time. This is difficult.

(2) How to properly dispatch the ventilation system, remove the harmful gases in the disaster area as soon as possible, and control the scope of the accident, which is the key to handling gas explosion accidents. Because of the location and conditions of the accident, whether it caused combustion or fire after the explosion? The difference of the scheduling method of the ventilation system (reverse wind, short circuit, enhanced ventilation, etc.) is difficult.

(3) How to safely and quickly restore the ventilation of the roadway or the windless area to avoid another explosion. This is difficult. Therefore, if the explosion occurs in the roadway, there is a large amount of gas and harmful gas accumulated in it, and there may be a fire source, such as the discharge of the miner's lamp damaged by the victim. Once the ventilation is restored, the oxygen content rises and it is easy to reach the explosion condition. The second explosion caused the damage is quite serious. When ventilation is not restored, it will not explode due to the low oxygen concentration.

3 technical points and difficulties to grasp and countermeasures

3.1 Technical points

In the first time of the accident, it is necessary to understand and master the situation and development of the accident as much as possible, make preliminary judgments on the relevant circumstances, causes and main measures to be taken, and quickly formulate technical solutions for disaster relief.

3.2 Grasping the technical difficulties

(1) After receiving the report of the gas explosion accident, is it necessary to quickly cut off the power supply in the disaster area? The criterion for its judgment is: whether the power supply will cause another explosion if it is cut off. If it can be concluded that it will not cause an explosion, the power supply in the disaster area must be cut off. However, it is often time-critical, the situation is unclear, it is impossible to judge accurately, and it is not allowed to hesitate and delay. At this time, it is necessary to look at the gas source that caused the explosion and the speed at which the gas is generally emitted from the accident site. If the gas explosion is caused by gas outburst or sudden gas source, then it is not appropriate to change the power supply status. Because the gas is abundant and the source of gas is sufficient, the flooded area is filled with a large amount of high-concentration gas, changing the power supply condition and generating electric sparks, which easily cause the gas to explode again, if not caused by sudden or sudden gas sources. It is a general accumulation, and the gas emission speed is not fast, the volume is not large, you must quickly cut off the power supply in the disaster area.

(2) Properly dispatch the ventilation system to control the scope of the disaster area. Eliminating harmful gases in the disaster area as soon as possible is the key to handling gas explosion accidents. Because the conditions and conditions of each gas explosion accident are different, the measures and methods adopted are different. First, it must be judged whether the explosion has caused a fire. The basis for its judgment is: first, the exact report is obtained; second, the CO of the return air system in the disaster area is detected. Wait for changes in toxic gases to judge. If it is confirmed that there is a fire or a burning fire in the disaster area, the treatment method must be handled in accordance with the “fire accident handling content” (disaster treatment plan) (not discussed too much here). If it can be determined that the explosion does not produce a fire or there is no source of combustion, it is necessary to take measures to increase the air volume and strengthen the ventilation (control the air volume at other locations, open a high-powered fan, and even consider measures such as starting a spare fan). The method of anti-wind must be carefully chosen. It can only be used when it can save more people. Under normal circumstances, it is not appropriate to fight against the wind.

In the procedure of restoring the ventilation system, the principle of “first big, then small, first and last” must be followed. That is to restore the main facilities, repair the main ventilation tunnels, and then restore other locations in order to achieve good results.

(3) Safely and quickly restore the ventilation of the roadway, find the victims, and end the disaster relief work as soon as possible. If the ventilation is gradually restored according to the general method, there is a problem that it is easy to cause a secondary explosion, which poses a serious threat to the disaster relief personnel. In order to ensure safety, it is recommended to adopt the method of “one recovery, long-distance start”. The specific operation is: the ambulance team wears the air duct in the roadway (due to the lack of oxygen in the roadway, even if there is high concentration of gas, there is a fire source Then, it will not explode. Then, all personnel will be evacuated to a safe area, and the local ventilator will be activated to recover the wind from a long distance. Even if there is a possibility of another explosion, the personal safety of the disaster relief personnel can be ensured.

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