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Ventilators should know and be able to -- outburst preventers
Release time:
2023-01-10
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Ventilators should know and be able to -- outburst preventers
Outburst preventers
1. induction conditions
(1) The outburst prevention workers must pass the training and take up their posts with valid certificates.
(2) Master the "Coal Mine Safety Regulations" and the methods, processes and attention of the province and company to the mine outburst prevention inspection.provisions of the matter.
(3) Understand the allowable concentration, over-limit hazards and prevention knowledge of various toxic and harmful gases in the mine.
(4) to understand the coal mine prevention of gas, coal dust explosion, prominent omen and fire and other mine disaster knowledge,And familiar with the mine disaster avoidance route.
2. preparation
(1) Before entering the well, the desorption instrument, stopwatch, atmospheric pressure gauge, thermometer, latex tube and coringThe instruments, instruments and tools required to be carried, such as pipes, coring coal sample tanks and portable gas alarms, are fully carried out.Check and calibrate, confirm that the instruments and meters are in good condition, and check the supporting devices and components (coal sample tank, Φ1~3mmCombination sieve and other tools) inspection, to ensure complete.
(2) Check the power supply of the instrument used and keep the power supply sufficient.
(3) Make clear the person in charge of data recording and parameter measurement during measurement.
3.Operation Method of DGC Type Gas Content Direct Tester
1. Drilling construction
(1) Qualified drilling tools with complete protection devices must be used.
(2) The drilling must be strictly in accordance with the quantity, orientation, angle and depth specified in the effect inspection design scheme.degree and other parameters for construction.
(3) The drill pipe connection shall be checked first to ensure that the drill pipe is not bent and the joint is complete.
(4) After drilling to the predetermined depth, select the reaming bit according to the outer diameter of the core pipe, and expand the drillingPredetermined depth.
(5) Remove the reaming bit, replace the coring tube, and send the coring tube to the bottom of the drilling hole;Water for 1~2min, remove the core pipe and the residue in the hole; then drill forward to core.
(6) After the coring tube is delivered to the bottom of the hole, adjust the drilling parameters, carry out sampling and drilling, and record with a stopwatch.The time of tripping out until the coring tube is full.
(7) Quickly push out the coring tube, properly sort the coal samples in the tube, and load the sorted coal samples into the coalSample core tank, and then carry out the next round of core operation construction.
2. Analysis of desorption amount of underground coring coal samples
(1) After the coal sample is loaded into the coal sample tank, tighten the coal sample tank cover and valve; at the same time, record the coring coal sample with a stopwatchTank sealing time, including coring end time, coring position, coring burial depth, borehole inclination and azimuth, etc.Record clearly, tighten the coal sample cylinder cover and valve, carefully check the air tightness of the coal sample cylinder, and record the sampling place at the same time.Point atmospheric pressure and temperature, prepare stopwatch, downhole desorption table and downhole desorption instrument.
(2) After the above work is ready, quickly connect the downhole desorption instrument with the core coal sample tank with a latex tube,Check the air tightness, record the initial liquid level scale, open the valve of the coring coal sample tank and the stopwatch to start reading, everyRead the liquid level scale once a minute until the end of 30min, and record the total desorption amount Q1.
(3) If the underground desorption gas volume reaches 85% of the maximum range of the underground desorption instrument, close the valve to re-feed.The desorber is filled with water, and then the valve is opened to continue desorption; after desorption, the valve of the coring coal sample tank is closed,Desorption to the surface laboratory.
(4) Downhole sampling should be as far as possible to reduce the sampling time;In case of drilling and powder discharge, attention must be paid to the air tightness of the coal sample barrel and the water leakage prevention of the downhole desorption instrument.The coal sample barrel must ensure that the valve is closed during the well lift.
3. Analysis of desorption amount of ground coring coal samples
3. Desorption work
(1) After the downhole coring and desorption personnel lift the well, immediately bring the coring coal sample tank with coal samples to the ground.The laboratory performs ground gas desorption, and records the time of arrival at the laboratory and the start of ground desorption.240
(2) Connect the air outlet of the coring coal sample tank to the ground gas desorption measuring pipe, and open the ground desorption device.Set the backlight, operate the glass tube operation handle to the suction exhaust gear, and press the vacuum pump start button to exhaustSuction, stop when the liquid level reaches the appropriate position; adjust the operation handle of the desorption tube to the connection state of the isolated vacuum pump.state, so that the solution tube is in a sealed state.
(3) When the desorption tube is in a sealed state, pay attention to observe the liquid level to see if there is any air leakage. IfThe existence should be eliminated in time before gas desorption can be carried out.
(4) Slowly open the valve of the coring coal sample tank and read the desorption amount of gas at certain time intervals,The length of the time interval depends on the desorption rate, and pay attention to the change law of the cumulative amount of desorption, and find that different.Often dealt with in a timely manner.
(5) When the measured desorption gas volume reaches 85% of the maximum range of a single measuring tube, open the conversion handle,Measure with a second measuring tube.
(6) Record the temperature, atmospheric pressure and test personnel of the surrounding environment, and the measurement time is generally not less30min, or gas desorption speed is very small.
(7) After the measurement, record the released gas quantity Q2，Q2and underground gas desorption quantity Q1sumMeasureable gas content Q3. After desorption, transfer to the coal sample weighing system, and then proceed to the next coalsample desorption work.
4. Weighing analysis work
(1) Turn on the power of the electronic balance, warm up the electronic balance, and the electronic balance is stable after about 5minThe large coal sample basin can be weighed on the electronic balance, and after the reading is stable, press the electric.The "peeling key" of the sub-balance is used to peel the quality of the coal sample basin.
(2) After the desorption measurement of the coal sample is completed, remove the large coal sample basin after peeling from the electronic balance and open itThe coring coal sample tank shall carefully pour the coal sample into the large coal sample basin to avoid scattering the coal sample; remove the obvious foreign gangueAfter such impurities, put them on an electronic balance for weighing, and at the same time observe and check the particle size of the coal sample, and record the coal.Total sample mass G and coal sample particle size description (rod, large block, large block, broken block and powder).
(3) Take two equal amounts of secondary coal samples from the coal sample basin and record the weight G of the secondary coal samples.2, the quality of the coal sampleThe amount is generally 100g ~ 120g, select the whole core or larger coal sample, to ensure that the secondary coal sample and the whole coal sample have the sameCharacteristics. If the test results of the two secondary coal samples are quite different, a third secondary coal sample should be taken.241
(4) Measure the quality of each secondary coal sample G2After that, use a hammer to smash it into smaller pieces on the crushing test bench.Granules (maximum particle size not more than 26mm), the coal sample into the pulverizer container.
(5) When placing the weighed object on the electronic balance, handle it with care, and do not exceed the maximum amount of the weighed object.After weighing, remove the weighing object from the electronic balance in time to avoid the electronic balance being inHeavy state; after weighing, power off and power off.
5. Crushing analysis work
(1) Put the weighed secondary coal sample into the pulverizer bowl, cover the lid with a sealing ring, andPress and seal tightly.
(2) Connect the volume measuring device, check the air tightness of the air circuit part, and ensure the air circuit system and cylinder body,There is no air leakage between the covers.
(3) Set the crushing time, put the weighed secondary coal samples into the crusher bowl one by one, and cover the belt.The cover with sealing ring shall be pressed and sealed tightly; the initial reading of measuring tube shall be recorded, and then the coal sample shall be crushed;Observe the desorption gas volume during operation, when the measured desorption gas volume reaches the maximum range of a single measuring tube.At 85%, turn on the changeover switch and measure with the second measuring tube; at the end of crushing, record the end reading of the measuring tube.
(4) If the gas desorption quantity Q of two coal samples with the same quality31and Q32The difference is not big, take the average as the residual.Residue desorption gas content Q3And make a record; If the difference between the two is too large, the third secondary coal sample shall be re-weighed.Crushing is carried out.
(5) The coal sample is crushed in the crusher for 3~5min or until there is basically no desorption gas to be sucked out.
(6) After crushing, pour out the coal sample in the material bowl, wipe it clean with cotton, and then conduct coal sampleuntil all the coal samples are crushed.
(7) Put the uncrushed coal sample and the crushed coal sample into the coal sample bag respectively, and fill in the label together.Put in the coal sample bag; the contents of the label include coring time, coring depth, total weight of coal sample, pulverized secondary coalSample weight and its crushing desorption amount.
(8) The secondary coal sample shall be crushed in time; The crusher shall take fixing and shock absorption measures; The operation process shall be prevented.to avoid collision and equipment damage.
6. Computer analysis work
(1) Input all the data obtained from underground and ground analysis into the analysis software and start computer analysis.242 Work.
(2) After the analysis work is completed, print the analysis results in time as required.
(3) After the analysis work is over, save the relevant data, turn off the computer, clean the laboratory, and waitNext gas content analysis work.
Operation Method of 4. WTC Gas Outburst Parameter Instrument
1. Underground determination of gas desorption index K1Value
(1) Underground determination of gas desorption index K1Value.
(2) Turn on the power supply of the main engine, and the instrument will first display the words "Chongqing Branch of China Coal Research Institute,Then go to the time menu.
2. Time setting
(1) If there is no deviation between the displayed time and the current time, press the "Return" key to enter the next menu directly;
(2) To modify the time, enter the corresponding number according to the flashing position on the time, and press the OK key to enterthe next menu.
3. Clearing
When the reset menu is displayed, press the number "1" key to clear all.
4.K1Setting of Threshold
(1) Enter the gas desorption index K according to the flashing position1Critical value;
(2) Enter the cuttings S critical value in the flashing position;
(3) Press the "OK" key to enter the working face number selection.
(4) Press the number key "1" or "2" or "3" to select the working face to be measured (each working faceUp to 30 data can be measured).
(5) Enter the working face number and press the OK key to enter K1Sampling menu.
(6) Start drilling and make the first hole determination. Collect all drill cuttings every 1m of drilling, and use springWeigh and record.
(7) Drill to a predetermined position (2m per drill), pick up pulverized coal with a combined sieve, and start the stopwatch at the same time.
(8) After the coal sample is fully screened with a Φ1~3mm combined sieve, it is quickly put into a coal sample bottle and usedScrape the sieve to make the volume of the coal sample and the volume of the coal sample bottle consistent, then tighten the tank cover and loosen the valve on the top of the cover.243
(9) When the stopwatch counts to the predetermined time t0When (t0Generally take 1min, 1.5min, 2min, should not beMore than 2min), tighten the valve on the cover, press the number "1" key to start K1Value determination.
(10)K1During the sampling process of value measurement, the pressure value shall be displayed once every 30s, and recorded according to the displayed pressure value10 times, then go to the next menu.
(11) input stopwatch timing time and hole depth, press the OK key to enter the next menu.
(12) Display K1Value, the coal sample is determined by ambi.
(13) Unscrew the coal sample tank and pour out the coal sample.
(14) In the process of measurement, if there is air leakage, it will automatically alarm and prompt, and the data this time is inaccurate.
(15) After pressing the digital "2" key, determine the second coal sample K according to the above operation1value until measuredFinish a Drill K1Value. If the end, press the number "1" key to enter the next menu.
(16) Repeat the above sequence to determine the next borehole K.1Value, until the determination of the face of all drilling.Hole K1Value.
(17) Enter the maximum cuttings S value and press the OK key to forecast the detection result.
(18) If the measurement of the next working face is carried out, press the "Return" key to enter and select the working face menu,Repeat the above steps.
(19) At the end of the measurement, turn off the power and the data will be saved automatically.
5. Ground printing
(1) Connect the host and printer with a data cable;
(2) Select "Charge/Print" on the charger to the printing side;
(3) Insert the two-core plug on the charger into the 220V power socket, turn on the main charging switch, and chargeThe printing indicator light on the generator is on;
(4) Turn on the host power;
(5) Press the "Return" key to enter the main menu, and press the number "2" to select the print menu;
(6) Press the number "1" to start printing;
(7) After printing, press "SEL" and "LF" to start empty paper feeding;
(8) Press "LF" again to finish and pull off the print sheet;
(9) Turn off the power supply of the host, turn off the main switch of the charger, remove the socket plug, and complete the printing.244
6. Discharge operation
The instrument can work continuously for 8h under the condition of sufficient power supply. If it is used for less than 8h, the instrument shall be carried outRecharge after discharge operation.
(1) Connect the 25-core connector (hole) on the charger with the 25-core connector (pin) on the host.
(2) If the voltage is higher than 9V, the discharge indicator lights up and starts to discharge.
(3) If it is not bright, the instrument can be charged.
Finally, fill in the "outstanding risk prediction (inspection) report".
4. considerations
(1) Drilling must be strictly in accordance with the number, orientation, angle and depth specified in the technical measures and operating procedures.degree, etc. to carry out construction.
(2) It is strictly prohibited to set up residual eyes for construction; Pay attention to inspection before work, and strictly implement the system of "knocking on the help and asking for the top.
(3) At least 2 people shall work together with each other when measuring the gas resolution, and keep the water column to measure lead during measurement.Vertical position.
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