1. Location of gas accumulation:

     2 , gas accumulation concentration:

     3. Reasons for gas accumulation:

     4. Schematic diagram of the exhaust gas ventilation system (the ventilation facilities, the direction of the incoming and outgoing airflow, the location of gas accumulation, the location of the alert, the communication call, etc.)

Second, the calculation

1. The amount of gas discharged:

     QCH4=L • S • C+q • t where: L —— gas accumulation roadway length ( m )

     S ——Gas accumulation roadway average section ( m2 )

     C —— the average concentration of gas accumulated in the roadway ( % )

     q —— normal gas emission from the roadway ( m3/ min)

     t ——Discharge gas time, can be set according to the actual situation (minutes)

     The result of the calculation is ( m3 )  

2. Minimum total air supply required for discharge: Qmin = • QCH4 = 49.5QCH4

      Where: Qmin - minimum total air supply required to discharge gas ( m3 )

     Cmax1 - Under normal circumstances, the maximum gas allowable concentration in the roadway, take Cmax1 = 1%.

     Cmax2 ——The maximum allowable concentration of gas in the roadway is Cmax2=2%

     QCH4 - Discharge gas volume ( m3 )

     The result of the calculation is ( m3 )

3. Time required to discharge gas:

     t = t - time required to discharge gas (minutes)

     Qmin - the minimum total air supply required to discharge gas ( m3 )

     Q Bureau - The average air supply volume of the local fan during the discharge process is generally 60% to 70% of the normal air supply volume of the local fan. ( m3/ min)

     The calculation result is (minutes), and considering other factors, it is determined as (minutes)

Third, the discharge of gas safety technical measures

     1. When discharging gas, the power supply must be cut off in the return air system, and the personnel should be withdrawn. Except for the rescuers and the inspectors, other personnel are strictly forbidden to enter the return air system and discharge the gas return air flow route.

     2. Any place that leads to the discharge of gas into the wind must be set up with an alert. The alert personnel must be responsible and responsible, and must not leave the post to sleep, to prevent the idlers from entering the return flow. Alert position

     The security checkpoint is handled by the security inspection team, and the security point is handled by the team.

     3. The discharge of gas through the electrical equipment in the roadway must be designated by a special person to cut off the power at the same time in the substation area and the distribution point of the mining area. This work is organized by the electromechanical area. The power supply is the responsibility of the team.

     4 , before the discharge of gas, must check the local fan and its switch Value="10" unitname="m" style="margin: 0px; padding: 0px;"> 10 m   The gas concentration in the range can only be activated when the gas concentration does not exceed 0.5% .

     5. After the local fan is started, it is necessary to check the operation of the local fan, and it is strictly forbidden to generate a circulating wind.

     6. When discharging, it is necessary to adopt a method of restricting the flow of air into the single-head roadway. Only one air duct can be renewed at a time, and it is strictly forbidden to “one wind blow”.

     7. When discharging, a portable gas detector should be hoisted at the full wind pressure mixed flow. The gas inspector checks the gas at the place. Only when the concentration of CH4 and CO2 does not exceed 1.5% , the wind can be continued. cylinder.

     8, when emissions should be controlled duct outlet end, so that in the different sections, from outside to inside, gradually advancing, in the same section, bottom-up full-face gas emissions.

     9. After the gas is discharged, it is verified that the gas concentration in the airflow in the entire single-head roadway does not exceed 1% , and the carbon dioxide concentration does not exceed 1.5% . After no abnormality for 20 minutes, the normal ventilation can be resumed and the warning can be withdrawn.

     10. After the roadway returns to normal ventilation, the electrical equipment in the roadway must be inspected by the construction unit electrician to verify that the electrical equipment is finished.

     11. After the discharge, the fan will be hung according to the standard by the bureau fan.

Fourth, participate in the discharge of gas personnel and duties

     1. A deputy chief engineer is responsible for the overall command work on site.

     2 , security inspection team 1--2 people, responsible for on-site supervision and inspection, implementation of measures implemented, measures are not implemented, no gas is allowed to discharge.

     3. The construction unit is responsible for the alert and the number of personnel, which is determined according to the measures.

     4, ventilation tile inspector a team, responsible for checking the mixed gas and romantic normal gas emissions inspection.

     5. At least 3 rescuers are responsible for the specific operation of the gas discharge. When discharging gas, wear an oxygen breathing apparatus.

     6. One person in the electromechanical zone is responsible for organizing the power transmission.

     7, the construction unit electrician who is responsible for emissions around the construction site stop transmission work.

     8. The measures for discharging gas shall be organized by the chief engineer of the mine or the head of the mine on duty, and the participants shall learn and strictly follow the measures.

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