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Ventilators should know and be able to-gas drainage
Release time:
2023-01-10
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Ventilators should know and be able to-gas drainage
Gas drainage work
1. induction conditions
(1) Gas drainage workers must pass the training and examination and take up their posts with valid certificates.
(2) familiar with the underground gas drainage system.
(3) Master the "Coal Mine Safety Regulations" and the provincial and company methods, processes and attention to mine gas drainage.provisions of the matter.
(4) Understand the allowable concentration of various toxic and harmful gases in the mine, the hazards of exceeding the limit and prevention knowledge.
(5) to understand the coal mine prevention of gas, coal dust explosion and fire and other mine disaster knowledge, and familiar with the mineAvoidance route.
2. preparation
(1) According to the work tasks and objectives of the day, bring all the required tools and instruments, and ensure that they are in good condition.
(2) If you need to work in the fence, you must formulate safety measures. Two people walk back and forth and check at any time.Gas in the roadway. When the gas exceeds the regulations, the entry shall be stopped, and measures shall be taken after asking for instructions.
(3) Clarify the person in charge of data recording and parameter determination during observation.
3. operation method
1. Water release operation
(1) Close the drain tank inlet valve.
(2) Open the pressure relief valve on the water tank.
(3) Open the drain valve on the water tank.
(4) After the water flow is completed, close the drain valve and the pressure relief valve in turn, open the water inlet valve, and the water discharge work is completed.
2. Connection and removal of gas drainage borehole
(1) Before connecting and dismantling the drilling holes, the floating gangue of the roof shall be cleaned off.
(2) The connected drill hole must be firmly connected with the shunt, and the connection part of the drill hole must be tied with a throat band.Depend, ensure no air leakage.
(3) The connecting pipeline between the drilling hole and the diverter shall be hung straight, and turning is strictly prohibited.
(4) Measures must be taken to prevent gas leakage after gas drilling or gas pipe removal in high drainage lane.
3. Plug-in drainage pipeline of mining face
(1) Close the main pipe valve of the upper corner extraction pipeline of the mining face, and then close the upper corner extraction pipeline end of the mining face.Remove the connecting screw of the original blocking plate of the head, and slowly slide the blocking plate by half to dilute the gas in the pipeline.
(2) After the gas in the pipeline is diluted, disassemble the tee or end blocking plate of the extraction pipe to be overlapped, and changeOverlap the head, insert the shift blocking plate to prevent negative pressure loss when overlapping the serpentine tube, and insert the serpentine tube variable head andBind it with 8# wire.
(3) After the pipeline is lapped, insert the other end of the serpentine tube into the wall blocked by the woven bag, and insert the wallUse yellow mud to smooth and block the edge of the serpentine pipe, and remove the tight screws on the shifting block plate.
(4) Open the return air lane valve to drain the goaf.
4. Observation and regulation
(1) When measuring the flow rate or negative pressure, if the U-shaped differential pressure gauge is not beating, check the water accumulation andTake water release measures.
(2) The observation record board must be hung at the drainage gas drilling and shunt observation points, and the observation location andHole No. After each observation, the relevant parameters (such as negative pressure, static pressure difference, gas concentration, flow rate, observationTime and the name of the observer) fill in the record board, and ensure that the card board, record and report three-line.
(3) When the gas concentration in the drainage pipeline changes sharply, the pipe of the borehole or high drainage roadway should be adjusted in timeRoad drainage negative pressure; When the concentration is too low and does not affect the gas content in the working surface, the hole (lane) should be closed.of the valve.
(4) valves, water traps and observation of gas concentration, negative pressure and flow should be set up in drainage holes and high drainage lane pipelines.amount of the device.
(5) The installation and rectification of the main extraction line must be approved by the person in charge of ventilation technology.
(6) In strict accordance with the gas drainage pipeline patrol inspection plan, regular inspections of the mine drainage system,Found that the pipeline rupture, leakage, water and other problems should be dealt with in a timely manner.
(7) The valves and observation hole screws of gas extraction pipelines within the scope of the branch must be cleaned and lubricated frequently,To ensure that the valves and observation holes are in normal use.
(8) When checking the gas concentration of the pipeline, it must be checked more than 2 times; When the error is found to be large, the originalBecause, for processing.
4. considerations
(1) When checking the gas in the pipeline, 100% of the tile detector should be used.
(2) When checking the gas concentration of the pipeline, it must be checked more than 3 times; when the error is found to be large, the originalBecause, for processing.
(3) Distilled water or mercury must be used in the U-shaped differential pressure gauge.
(4) When observing, place the U-shaped differential pressure gauge vertically so that the concave surface of the two water columns is flat.
(5) When using a U-shaped differential pressure gauge to determine the pumping pressure, the pressure on the hose and pipeline of the differential pressure gauge should beConnect the hole with force and make it stable for 1~2min, then read the pressure value.
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