Fire prevention technology in the hottest mine

Mine fire prevention technology

1. Prevention technology of coal spontaneous combustion

prevention technology of coal spontaneous combustion includes: inerting, plugging, cooling, etc., as well as their combinations. Inerting technology is a technology that sends inert gas or other inert substances into the area to be treated to inhibit coal spontaneous combustion. It mainly includes yellow mud grouting, fly ash, inhibitor, inhibitor mud and inert gas, etc. Plugging is to adopt some technical measures to reduce or eliminate the air leakage to the coal pillar or goaf, so that the coal will lack oxygen and not spontaneous combustion. Plugging technology and materials mainly include: pressure resistant cement foam, gel plugging technology, tailings sand plugging and pressure equalization, etc

2. Fire area closure, management and unsealing

fire area closure. When the fire prevention measures fail or there is no time to take direct fire extinguishing measures due to the rapid fire, the fire area needs to be closed in time to prevent the expansion of the fire situation. The smaller the enclosed area of the fire area, the less oxygen to maintain combustion, and the faster the fire area will be extinguished. Therefore, the enclosed area of the fire area should be narrowed as much as possible and the number of firewalls should be reduced as much as possible. In order to isolate the fire area, the firewall on the air inlet side should be closed or closed first, and then the air return side should be closed. At the same time, the general safety requirements for food contact materials, the list of materials and restrictions for authorized use of raw materials and additives, the safety requirements for products of various materials and relevant detection methods should be given in detail, and the main channel (or main air flow) for air supply to the fire area should be closed first, Then close the side air ducts (or side air flow) that supply air to the fire area

fire area management. After the fire area is closed, the management of the fire area should be strengthened before the fire area is completely extinguished. The technical work of fire area management includes the data analysis and sorting of the fire area, as well as the observation and inspection of the fire area. The location diagram of the fire area shall be drawn, indicating all the fire areas and the places where the alarm level can be set, and indicating the number of the fire area, the time and place of the fire, the main monitored gas composition, concentration, etc. Fire area management cards must be established for each fire area, including fire area registration form, fire area filling fire extinguishing material record form and firewall observation record form

the fire area is unsealed. The fire area can be considered to have been extinguished and allowed to be unsealed only after it is confirmed by sampling, analysis and analysis that the following conditions are met:

the temperature in the fire area drops below 30 ℃, or it is the same as the daily air temperature in the area before the fire

the oxygen concentration in the fire area drops below 5%

the air in the fire area does not contain ethylene and acetylene, and carbon monoxide gradually decreases and stabilizes below 0.00l% during the closure period

the outlet water temperature in the fire area is lower than 25 ℃, or the same as the daily outlet water temperature in the area before the fire

it is required that the above four indicators remain stable for more than one month

3. emergency response and disaster relief technology during fire

emergency response and disaster relief technology during fire includes air flow control technology, mine anti wind technology and fire prevention technology

air flow control technology refers to selecting a reasonable ventilation system, strengthening ventilation management and reducing air leakage

mine anti wind technology refers to the local anti wind or whole mine anti wind method that can be adopted according to the specific situation of underground fire and under the safety conditions of operators and major equipment and facilities

the main methods to prevent the expansion of fire are: isolation method (isolate the fire area from other non fire areas after closing it), asphyxiation method (completely close the fire area and block the combustion supporting materials (air, oxygen, etc.) to stop the fire), grouting fire extinguishing (pour mud into the fire area, so that the fire is wrapped by mud, isolate the air, and prevent the further spread of the fire) Vladimir Putin has called Erdogan chemical agent to extinguish the fire (spray the front of group A on the rubber film chemical agent on the igniter or inject it into the igniter to inhibit or delay the oxidation of the igniter, so as to prevent the expansion of the fire)