CN109252884B - Gob-side entry retaining working face Y-shaped ventilation pressure regulating disaster prevention method - Google Patents
Gob-side entry retaining working face Y-shaped ventilation pressure regulating disaster prevention method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 31
- 238000009423 ventilation Methods 0.000 title claims abstract description 24
- 230000002265 prevention Effects 0.000 title claims abstract description 20
- 239000003245 coal Substances 0.000 claims abstract description 77
- 238000005065 mining Methods 0.000 claims abstract description 44
- 229910002091 carbon monoxide Inorganic materials 0.000 claims abstract description 16
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000002485 combustion reaction Methods 0.000 claims abstract description 10
- 230000002269 spontaneous effect Effects 0.000 claims abstract description 10
- 238000012544 monitoring process Methods 0.000 claims description 16
- 238000002955 isolation Methods 0.000 claims description 15
- 230000001276 controlling effect Effects 0.000 claims description 6
- 239000004744 fabric Substances 0.000 claims description 4
- 239000003063 flame retardant Substances 0.000 claims description 4
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 231100000614 poison Toxicity 0.000 claims description 3
- 230000007096 poisonous effect Effects 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 7
- 239000007789 gas Substances 0.000 description 31
- 231100000331 toxic Toxicity 0.000 description 6
- 230000002588 toxic effect Effects 0.000 description 6
- 238000005192 partition Methods 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/006—Ventilation at the working face of galleries or tunnels
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/10—Air doors
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/10—Air doors
- E21F1/12—Devices for automatically opening air doors
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/103—Dams, e.g. for ventilation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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Abstract
A gob-side entry retaining working face Y-shaped ventilation pressure regulating disaster prevention method belongs to the field of coal mine disaster prevention and control. The method comprises the following steps: the main air inlet lane and the auxiliary air inlet lane are respectively provided with a PLC (programmable logic controller), a frequency converter, a local ventilator, an air cylinder, an air door and an air speed sensor, and the air quantity of the air inlet lane is automatically regulated and controlled, so that the pressure difference value between the air inlet end and the air return end of the coal mining operation surface is controlled in a minimum range, and primary pressure equalization of the main air inlet lane, the coal mining operation surface and the auxiliary air inlet lane is realized; the return airway is provided with an adjusting air window, a PLC (programmable logic controller), a gas sensor, a carbon monoxide sensor, a wind speed sensor, a pressure measuring drill hole and a pressure difference sensor, the wind pressure of the return airway is automatically adjusted, the wind pressure of each measuring point of the return airway is not lower than that of a goaf, the pressure difference higher than the goaf is controlled in a reasonable range, and secondary pressure equalization of the return airway and the goaf is realized. The method adopts automatic pressure regulation in different areas, achieves the effect of twice pressure equalization of a working face, and can comprehensively prevent and control potential safety hazards such as gas, spontaneous combustion fire and the like of the working face of the gob-side entry retaining.
Description
Technical Field
The invention belongs to the technical field of coal mine disaster prevention and control, and particularly relates to a gob-side entry retaining working face Y-shaped ventilation pressure-regulating disaster prevention method.
Background
In order to improve the recovery rate of coal mining, a common mining method is to adopt a gob-side entry retaining arrangement mode on a mine working face. Along with the advance of the coal face, a filling wall body of about 2m is reserved on one side of the goaf close to the roadway or an isolation wall body is automatically formed by adopting a roof cutting method, so that the roadway is reserved and is used as the next working face for mining. The gob-side entry retaining adopts Y type ventilation mode more, and the problem that corner gas is transfinite on the working face can effectively be solved to the tunnel return air that original two tunnels air inlet, remain promptly.
However, with the mining of the coal face, a large number of cracks often appear under the action of the mine pressure appearing on the isolation wall, and under the influence of the ventilation negative pressure of the return airway, toxic and harmful gases such as carbon monoxide and gas in the goaf are caused to flow into the return airway, and the longer the pushing distance of the coal face is, the more toxic and harmful gases are flowed out, and a plurality of potential safety hazards are brought to the coal mine production. And the traditional pressure-equalizing ventilation method is applied to pressurize the mine working face, so that the toxic and harmful gases can be effectively prevented from rushing in, a large amount of fresh air flow is caused to leak into the goaf, and accidents such as spontaneous combustion and fire hazard of residual coal in the goaf, even gas explosion and the like are easily caused. Other countermeasures often employed include: the sealing performance of the isolation wall is enhanced by strengthening the plugging, the gas in the goaf is extracted by arranging the drill holes, the expected effect is difficult to ensure, and a strong air leakage area is easily formed by high negative pressure formed by gas extraction, so that the spontaneous combustion fire hazard of the residual coal in the goaf is formed.
Disclosure of Invention
The invention aims at the problems existing in the traditional technical method and aims at providing a gob-side entry retaining working face Y-shaped ventilation pressure regulating and disaster preventing method which adopts a partition automatic pressure regulating method aiming at the arrangement form of the Y-shaped ventilation working face to achieve the effect of twice pressure equalizing of the working face, namely, automatically regulating and controlling the air quantity of an air inlet lane to ensure that the pressure difference value between the air inlet end and the air return end of a coal mining working face is controlled in the minimum range, realizing the primary pressure equalizing of a main air inlet lane, a coal mining working face and an auxiliary air inlet lane, automatically regulating the air pressure of an air return lane to meet the condition that the air pressure of each measuring point of the air return lane is not lower than the air pressure of a gob and higher than the pressure difference of the gob is controlled in a reasonable range, realizing the secondary pressure equalizing of the air return lane and the gob-gob area, reducing the air leakage of the gob to the greatest extent, preventing toxic and harmful gases from flowing into the, And the spontaneous combustion of the residual coal in the goaf and other potential safety hazards are effectively prevented and controlled.
A gob-side entry retaining working face Y-shaped ventilation pressure regulating disaster prevention method comprises the following steps:
s1, taking two tunnels on two original sides of the working face as air inlet tunnels, wherein the air inlet tunnel supplying air to the coal mining working face is taken as a main air inlet tunnel, and the other air inlet tunnel is taken as an auxiliary air inlet tunnel;
a first PLC controller, a first frequency converter, a first local ventilator, a first air door and a first air duct are arranged in the main air inlet lane, a first air speed sensor is arranged between the first air duct of the main air inlet lane and an air outlet of the main air inlet lane, the first PLC controller is connected with the first frequency converter, the first frequency converter is connected with the first local ventilator, the first local ventilator is connected with the first air duct, the first air duct penetrates through the first air door to supply air into the main air inlet lane, and the first air speed sensor is connected with the first PLC controller;
a second PLC controller, a second frequency converter, a second local ventilator, a second air door and a second air duct are arranged in the auxiliary air inlet lane, a second air speed sensor is arranged between the second air duct of the auxiliary air inlet lane and an air outlet of the auxiliary air inlet lane, the second PLC controller is connected with the second frequency converter, the second frequency converter is connected with the second local ventilator, the second local ventilator is connected with the second air duct, the second air duct supplies air into the auxiliary air inlet lane through the second air door, and the second air speed sensor is connected with the second PLC controller;
s2, taking a tunnel reserved on the working face along the empty tunnel as a return air tunnel, wherein a third air speed sensor, an electro-hydraulic control automatic adjusting air window, a third PLC (programmable logic controller), a gas sensor and a carbon monoxide sensor are arranged in the return air tunnel, the third air speed sensor is connected with the third PLC, and the electro-hydraulic control automatic adjusting air window is connected with the third PLC;
the method comprises the steps that an air window is automatically adjusted through electro-hydraulic control in the direction from an air window to a coal mining working face, one end of the air window is automatically adjusted through electro-hydraulic control as a starting point, a plurality of pressure measuring drill holes and a plurality of pressure difference sensors are arranged at intervals, the interval between every two adjacent pressure measuring drill holes is 150-200 m, a pressure measuring pipe is correspondingly arranged in each pressure measuring drill hole, one end of each pressure measuring pipe is connected with the corresponding pressure difference sensor, the other end of each pressure measuring pipe penetrates through an isolation wall body and is communicated to the inside of a goaf, and;
s3, arranging an isolation wall body in the continuous working face within the width range of the open cut, and increasing the tightness of the isolation wall body in the area by adopting the measures of firstly hanging flame-retardant air cylinder cloth and then spraying concrete;
s4, automatically regulating and controlling the air volume of the main air inlet lane and the auxiliary air inlet lane to enable the air volume of the air inlet lane, the coal mining operation surface and the return air lane to meet the air distribution requirement;
one end of the coal mining operation surface communicated with the main air inlet lane is an air inlet end, and one end of the coal mining operation surface communicated with the auxiliary air inlet lane is an air return end; the pressure difference value of the air inlet end and the air return end of the coal mining working face is controlled in a minimum range, air leakage to a goaf is reduced to the maximum extent, and primary pressure equalization of a main air inlet lane-coal mining working face-auxiliary air inlet lane region of a gob-side entry retaining working face is realized;
s5, according to the pressure difference monitoring value of each measuring point of the return airway, the electro-hydraulic control automatic adjusting air window is adjusted, the air pressure of the return airway is automatically adjusted, the air pressure of each measuring point of the return airway is not lower than the air pressure of the gob, the minimum pressure difference value of each measuring point higher than the gob is not higher than 5-10 Pa, poisonous and harmful gas in the gob is prevented from flowing into the return airway and a large amount of air current in the return airway leaks into the gob, and secondary pressure equalizing of a gob-side entry retaining face 'return airway-gob' area is achieved.
In the step S1, the first wind speed sensor signal is transmitted to the first PLC controller in real time, the first PLC controller controls the first frequency converter, and the first frequency converter adjusts the revolution of the first local ventilator to adjust the air volume of the main air intake lane in real time; and signals of the second wind speed sensor are transmitted to the second PLC controller in real time, the second PLC controller controls the second frequency converter, and the second frequency converter adjusts the revolution of the second local ventilator to adjust the air quantity of the auxiliary air inlet lane in real time.
In the step S1, the first air door and the second air door are both provided with two air doors, and the distance between the first air door through which the inlet air passes and the air inlet end of the air inlet tunnel is 10-20 m; in the first air door and the second air door, the distance between two air doors for passing through the vehicle is not less than the length of one mine car, and the distance between two air doors for passing through the pedestrian is not less than 5 m.
In the step S1, the first air duct and the second air duct are both skeleton air ducts, the skeleton air ducts penetrate through the two air doors, one end of the skeleton air duct is connected with the local ventilator, and the other end of the skeleton air duct is communicated to the air inlet lane.
In the step S2, the third wind speed sensor is configured to monitor a wind speed of the return airway in real time, the gas sensor is configured to monitor a gas concentration of the return airway in real time, and the carbon monoxide sensor is configured to monitor a carbon monoxide gas concentration of the return airway in real time; wherein, the gas concentration overrun index is 1%, and the carbon monoxide gas concentration overrun index is 24 ppm.
In the step S2, the differential pressure sensor is configured to monitor a differential pressure value between the return airway and the gob, the differential pressure signal is transmitted to a third PLC controller provided in the return airway in real time, and the third PLC controller controls to change the opening of the electro-hydraulic control automatic adjustment air window, so as to adjust the air pressure in the return airway in real time.
In step S2, a roadway is reserved along the empty space of the working surface, and in order to provide an isolation wall between the gob and the continuous working surface, the roadway between the isolation wall and the continuous working surface is used as the roadway reserved along the empty space of the working surface.
In the step S4, the main air intake lane, the auxiliary air intake lane, the coal face, and the return air lane all should satisfy: the minimum wind speed is not lower than 0.25m/s, and the maximum wind speed is not higher than 4 m/s.
In step 4, the pressure difference value between the air inlet end and the air return end of the coal mining working face can be expressed as:
in the formula: delta PcThe pressure difference value of an air inlet end and an air return end of the coal mining working face is obtained; r is the wind resistance of the coal mining working face, and the wind resistance is considered to be constant in a certain period; qjAnd the air volume of the coal mining working face is the air volume of the main air inlet tunnel. The pressure difference value delta P between the air inlet end and the air return end of the coal facecThe air quantity regulation range of the main air inlet lane to reach the minimum is as follows:
Q≤Qj≤(1～1.05)×Q
in the formula: q, the coal face reaches the basic air quantity required by the safety requirement; 1-1.05 is an allowable fluctuation coefficient for air quantity regulation of the main air inlet lane.
In the step 5, the monitoring values of the differential pressure at each measuring point of the return airway are respectively set as follows from the direction from the electric hydraulic control automatic adjustment air window to the coal mining working face: delta P1、ΔP2…ΔPnWherein the value measured by a differential pressure sensor arranged at the electro-hydraulic control automatic adjustment air window is used as delta P1It should satisfy: delta P1≥0、ΔP2≥0…ΔPnNot less than 0, and the minimum differential pressure value delta P in n measuring pointsminAnd the pressure is not higher than 5-10 Pa, so that the spontaneous combustion of the residual coal caused by a large amount of air flow leaking into the goaf of the return airway is avoided.
The Y-shaped ventilation pressure-regulating disaster prevention method for the gob-side entry retaining working face has the beneficial effects that:
by the aid of the automatic pressure regulating method for the gob-side entry retaining working face in the partition mode, primary pressure equalizing of a main air inlet lane-coal mining working face-auxiliary air inlet lane region and secondary pressure equalizing of a return air lane-goaf region are achieved, the effect of secondary pressure equalizing of the working face is achieved, air leakage to the goaf can be reduced to the greatest extent, and poisonous and harmful gas in the goaf is effectively prevented from flowing into the return air lane. The pressure regulating system provided by the invention realizes the automatic self-feedback control of air quantity and air pressure, is efficient and reliable, and has a more precise and comprehensive pressure regulating strategy. Compared with the traditional disaster prevention methods such as pressure-equalizing ventilation, air leakage plugging, gas extraction and the like, the method has the advantages of better effects of preventing and controlling potential safety hazards such as gas overrun of the gob-side entry retaining working face, spontaneous combustion of residual coal in the goaf and the like, lower cost and strong practicability and operability. The invention adopts a partition automatic pressure regulating method, achieves the effect of twice pressure equalizing on one working face, and can comprehensively prevent and control potential safety hazards such as gas, spontaneous combustion fire and the like on the working face of the gob-side entry retaining.
Drawings
FIG. 1 is a layout diagram of a gob-side entry retaining working face Y-shaped ventilation pressure regulating system in the embodiment of the invention
1-main air inlet lane, 2-first PLC controller, 3-first frequency converter, 4-first local ventilator, 5-first air door, 6-first air duct, 7-first wind speed sensor, 8-auxiliary air inlet lane, 9-second PLC controller, 10-second frequency converter, 11-second local ventilator, 12-second air door, 13-second air duct, 14-second wind speed sensor, 15-return air lane, 16-third wind speed sensor, 17-coal mining working face, 18-electro-hydraulic control automatic adjusting air window, 19-third PLC controller, 20-gas sensor, 21-carbon monoxide sensor, 22-pressure measuring drill hole, 23-differential pressure sensor, 24-continuous working face cutting hole, 25-isolation wall, 26-flame retardant air duct cloth, 27-concrete, 28-goaf, 29-pressure measuring pipe.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings and an example of a working surface of a coal mine 62709.
Examples
A gob-side entry retaining working face Y-shaped ventilation pressure regulating disaster prevention method is disclosed, a gob-side entry retaining working face Y-shaped ventilation pressure regulating system layout is shown in figure 1, and the pressure regulating disaster prevention method comprises the following steps:
s1, taking two tunnels on two original sides of the working face as air inlet tunnels, wherein the air inlet tunnel supplying air to the coal mining working face 17 is taken as a main air inlet tunnel 1, and the other air inlet tunnel is taken as an auxiliary air inlet tunnel 8;
the air inlet end of the main air inlet lane 1 is respectively provided with a first PLC (programmable logic controller) 2, a first frequency converter 3, a first local ventilator 4, a first air door 5 and a first air duct 6, a first air speed sensor 7 is arranged between the first air duct 6 of the main air inlet lane 1 and an air outlet of the main air inlet lane, the first PLC 2 is connected with the first frequency converter 3, the first frequency converter 3 is connected with the first local ventilator 4, the first local ventilator 4 is connected with the first air duct 6, the first air duct 6 supplies air into the main air inlet lane 1 through the first air door 5, and the first air speed sensor 7 is connected with the first PLC 2;
the air inlet end of the auxiliary air inlet lane 8 is respectively provided with a second PLC (programmable logic controller) 9, a second frequency converter 10, a second local ventilator 11, a second air door 12 and a second air duct 13, a second air speed sensor 14 is arranged between the second air duct 13 of the auxiliary air inlet lane 8 and an air outlet of the auxiliary air inlet lane, the second PLC 9 is connected with the second frequency converter 10, the second frequency converter 10 is connected with the second local ventilator 11, the second local ventilator 11 is connected with the second air duct 13, the second air duct 13 passes through the second air door 12 to supply air into the auxiliary air inlet lane 8, and the second air speed sensor 14 is connected with the second PLC 9.
Signals of the first wind speed sensor 7 are transmitted to the first PLC controller 2 in real time, the first PLC controller 2 controls the first frequency converter 3, and the first frequency converter 3 adjusts the revolution number of the first local ventilator 4 to adjust the air volume of the main air intake lane 1 in real time; signals of a second wind speed sensor 14 are transmitted to a second PLC (programmable logic controller) 9 in real time, the second PLC 9 controls a second frequency converter 10, and the second frequency converter 10 adjusts the revolution of a second local ventilator 11 to adjust the air quantity of the auxiliary air inlet lane 8 in real time;
the first air door 5 and the second air door 12 are both arranged into two air doors, and the distance between the first air door through which air enters and the air inlet end of the air inlet roadway is 15 m; the first air door 5 is used for passing through a vehicle, the distance between the two air doors is 25m and is slightly larger than the length of a mine car, the second air door 12 is used for pedestrians, and the distance between the two air doors is 6 m;
the first air duct 6 and the second air duct 13 are skeleton air ducts, the skeleton air ducts penetrate through two air doors, one end of each skeleton air duct is connected with the local ventilator, and the other end of each skeleton air duct is communicated to the air inlet lane.
S2, taking a roadway reserved on the working face along the empty space as a return airway 15, arranging a third air speed sensor 16 in the middle of the return airway 15, arranging an electric hydraulic control automatic adjusting air window 18, a third PLC 19, a gas sensor 20 and a carbon monoxide sensor 21 at the tail end of the return airway 15, connecting the third PLC 19 with the electric hydraulic control automatic adjusting air window 18, and connecting the third air speed sensor 16 with the third PLC 19;
the third wind speed sensor 16 is used for monitoring the wind speed of the return airway 15 in real time, the gas sensor 20 is used for monitoring the gas concentration of the return airway 15 in real time, and the carbon monoxide sensor 21 is used for monitoring the carbon monoxide gas concentration of the return airway 15 in real time; wherein, the gas concentration overrun index is 1%, and the carbon monoxide gas concentration overrun index is 24 ppm.
The method comprises the following steps that (1) from an electric hydraulic control automatic adjusting air window 18 to a coal face 17 direction, one end of the electric hydraulic control automatic adjusting air window 18 is used as a starting point, a plurality of pressure measuring drill holes 22 are arranged at intervals, the interval between every two adjacent pressure measuring drill holes is 180m, a pressure measuring pipe 29 is arranged in each pressure measuring drill hole, one end of each pressure measuring pipe 29 is connected with a pressure difference sensor 23, the other end of each pressure measuring pipe penetrates through an isolation wall 25 and is communicated to the inside of a goaf 28, and each pressure difference sensor is connected with a;
the differential pressure sensor 23 is used for monitoring the differential pressure value of the return airway 15 and the gob 28, differential pressure signals are transmitted to the third PLC 19 arranged on the return airway 15 in real time, the third PLC 19 controls and changes the opening of the electro-hydraulic control automatic adjusting air window 18, and the air pressure of the return airway 15 is adjusted in real time.
S3, reserving an isolation wall 25 in the width range of the cut 24 of the continuous working surface in the return airway 15, and increasing the tightness of the isolation wall 25 in the area by adopting the measures of firstly suspending the flame-retardant air cylinder cloth 26 and then spraying the concrete 27;
s4, automatically regulating and controlling the air volume of the main air inlet lane 1 and the auxiliary air inlet lane 8, so that the air volume of the air inlet lanes 1 and 2, the coal mining working face 17 and the return air lane 15 meet the air distribution requirement;
the main air inlet lane 1, the auxiliary air inlet lane 8, the coal mining working face 17 and the return air lane 15 all meet the following requirements: the minimum wind speed is not lower than 0.25m/s, and the maximum wind speed is not higher than 4 m/s.
One end of the coal mining operation surface 17 communicated with the main air inlet lane 1 is an air inlet end, and one end of the coal mining operation surface 17 communicated with the auxiliary air inlet lane 8 is an air return end; the pressure difference value of the air inlet end and the air return end of the coal face 17 is controlled in a minimum range, air leakage to the goaf 28 is reduced to the maximum extent, and primary pressure equalization of the region of a main air inlet lane 1, a coal face 17 and an auxiliary air inlet lane 8 of the gob-side entry retaining face is realized;
the pressure difference value of the air inlet end and the air return end of the coal mining operation surface 17 can be expressed as:
in the formula: delta PcThe pressure difference value of the air inlet end and the air return end of the coal mining operation surface 17; r-coal face17, wind resistance, which is considered to be constant in a certain period; qjThe air volume of the coal face 17 is the air volume of the main air inlet lane 1. The pressure difference value delta P between the air inlet end and the air return end of the coal mining operation surface 17 is enabledcThe air quantity regulation and control range of the main air inlet lane 1 reaching the minimum is as follows:
Q≤Qj≤(1～1.05)×Q
in the formula: q-the coal face 17 meets the basic air demand of the safety requirement; 1-1.05 is an allowable fluctuation coefficient for regulating and controlling the air quantity of the main air inlet lane 1.
In this embodiment, the basic air flow Q of the coal face 17 meeting the safety requirement is 1125m3And/min, the air quantity regulation and control fluctuation coefficient of the main air inlet lane 1 is 1.05, and the regulation and control range of the air quantity of the main air inlet lane 1 is as follows: 1125m3/min≤Qj≤1181m3Min, the air quantity of the auxiliary air inlet lane 8 is 353m3The air quantity of the return air way 15 is the sum of the air quantity of the main air inlet way 1 and the air quantity of the auxiliary air inlet way 8, and the variation range is 1478-1534 m3Min; the cross-sectional area of each roadway is 11.76m2And then the allowable fluctuation range of the wind speed of the main air intake lane 1 is as follows: 1.59-1.67 m/s, and the wind speed of the auxiliary air inlet lane 8 is as follows: 0.5m/s, the variation range of the wind speed of the return airway 15 is as follows: 2.09-2.17 m/s; average cross-sectional area of 17 of coal face 12.57m2The wind speed variation range is as follows: 1.49-1.57 m/s; the wind speeds of the main air inlet lane 1, the auxiliary air inlet lane 8, the coal mining working face 17 and the return air lane 15 are all within the required range of 0.25-4 m/s.
In this embodiment, the wind resistance of the coal face 17 is 0.29 ns2/m8When the air volume of the main air inlet lane 1 is the minimum value 1125m3At the time of/min, the pressure difference value between the air inlet end and the air return end of the coal mining operation surface 17 reaches the minimum value, and delta PcThe pressure equalizing effect of the coal face 17 is the best when the pressure is 102 Pa; when the air quantity of the main air inlet lane 1 is regulated to be the maximum value 1181m of allowable fluctuation3At/min, the pressure difference value delta P between the air inlet end and the air return end of the coal mining operation surface 17c112Pa, the maximum pressure difference allowed to fluctuate.
S5, according to the pressure difference monitoring value of each measuring point of the return airway 15, the electro-hydraulic control automatic adjusting air window 18 is adjusted, the air pressure of the return airway 15 is automatically adjusted, the air pressure of each measuring point of the return airway 15 is not lower than the air pressure of the gob 28, the minimum pressure difference value of each measuring point higher than the gob 28 is not higher than 5Pa, toxic and harmful gas in the gob 28 is prevented from flowing into the return airway 15 and a large amount of air flow in the return airway 15 is prevented from leaking into the gob 28, and secondary pressure equalizing of the gob-side entry retaining working face 'return airway 15-gob 28' area is achieved.
Wherein, the monitoring value of the pressure difference of each measuring point of the return airway 15 is from the direction of the electric hydraulic control automatic adjusting air window 18 to the coal face 17, and is respectively set as: delta P1、ΔP2…ΔPnWherein the value measured by the differential pressure sensor 23 provided at the electrohydraulic control automatic adjusting damper 18 is Δ P1It should satisfy: delta P1≥0、ΔP2≥0…ΔPnNot less than 0, and the minimum differential pressure value delta P in n measuring pointsminShould not be higher than 5Pa, avoid the return airway 15 air current to leak into the gob 28 in a large number and lead to the spontaneous combustion of the coal that remains.
In the embodiment, the coal face 17 is pushed by 380m, 3 pressure measuring drill holes 22 and pressure difference sensors 23 are arranged in total, and the pressure difference monitoring values of all measuring points are respectively delta P from the electric hydraulic control automatic adjusting air window 18 to the coal face 171、ΔP2、ΔP3And the minimum differential pressure value in 3 measuring points is delta P12.4Pa < 5Pa, and the differential pressure values of other two measuring points are respectively delta P2＝4.1Pa、ΔP36.7Pa, the monitoring value of the gas sensor 20 is 0.12 percent, the monitoring value of the carbon monoxide sensor 21 is 0ppm, so that a large amount of air flow caused by overhigh pressure difference between the return airway 15 and the gob 28 is effectively prevented from leaking into the gob 28, and toxic and harmful gas in the gob 28 is prevented from rushing into the return airway 15.
According to the Y-shaped ventilation pressure-regulating disaster prevention method for the gob-side entry retaining working face, a 'primary pressure-equalizing region of a main air inlet lane, a coal mining working face and an auxiliary air inlet lane' and a 'secondary pressure-equalizing region of a return air lane and a gob' are realized by a gob-side entry retaining working face partition automatic pressure-regulating method, a primary pressure-equalizing effect of a working face is achieved, and potential safety hazards such as gas overrun of the gob-side entry retaining working face and spontaneous combustion of residual coal in the gob are effectively eliminated.
Claims (8)
1. A gob-side entry retaining working face Y-shaped ventilation pressure regulating disaster prevention method is characterized by comprising the following steps:
s1, taking two tunnels on two original sides of the working face as air inlet tunnels, wherein the air inlet tunnel supplying air to the coal mining working face is taken as a main air inlet tunnel, and the other air inlet tunnel is taken as an auxiliary air inlet tunnel;
a first PLC controller, a first frequency converter, a first local ventilator, a first air door and a first air duct are arranged in the main air inlet lane, a first air speed sensor is arranged between the first air duct of the main air inlet lane and an air outlet of the main air inlet lane, the first PLC controller is connected with the first frequency converter, the first frequency converter is connected with the first local ventilator, the first local ventilator is connected with the first air duct, the first air duct penetrates through the first air door to supply air into the main air inlet lane, and the first air speed sensor is connected with the first PLC controller;
a second PLC controller, a second frequency converter, a second local ventilator, a second air door and a second air duct are arranged in the auxiliary air inlet lane, a second air speed sensor is arranged between the second air duct of the auxiliary air inlet lane and an air outlet of the auxiliary air inlet lane, the second PLC controller is connected with the second frequency converter, the second frequency converter is connected with the second local ventilator, the second local ventilator is connected with the second air duct, the second air duct supplies air into the auxiliary air inlet lane through the second air door, and the second air speed sensor is connected with the second PLC controller;
s2, taking a tunnel reserved on the working face along the empty tunnel as a return air tunnel, wherein a third air speed sensor, an electro-hydraulic control automatic adjusting air window, a third PLC (programmable logic controller), a gas sensor and a carbon monoxide sensor are arranged in the return air tunnel, the third air speed sensor is connected with the third PLC, and the electro-hydraulic control automatic adjusting air window is connected with the third PLC;
the method comprises the steps that an air window is automatically adjusted through electro-hydraulic control in the direction from an air window to a coal mining working face, one end of the air window is automatically adjusted through electro-hydraulic control as a starting point, a plurality of pressure measuring drill holes and a plurality of pressure difference sensors are arranged at intervals, the interval between every two adjacent pressure measuring drill holes is 150-200 m, a pressure measuring pipe is correspondingly arranged in each pressure measuring drill hole, one end of each pressure measuring pipe is connected with the corresponding pressure difference sensor, the other end of each pressure measuring pipe penetrates through an isolation wall body and is communicated to the inside of a goaf, and;
s3, arranging an isolation wall body in the continuous working face within the width range of the open cut, and increasing the tightness of the isolation wall body in the area by adopting the measures of firstly hanging flame-retardant air cylinder cloth and then spraying concrete;
s4, automatically regulating and controlling the air volume of the main air inlet lane and the auxiliary air inlet lane to enable the air volume of the air inlet lane, the coal mining operation surface and the return air lane to meet the air distribution requirement;
one end of the coal mining operation surface communicated with the main air inlet lane is an air inlet end, and one end of the coal mining operation surface communicated with the auxiliary air inlet lane is an air return end; the pressure difference value of the air inlet end and the air return end of the coal mining working face is controlled in a minimum range, air leakage to a goaf is reduced to the maximum extent, and primary pressure equalization of a main air inlet lane-coal mining working face-auxiliary air inlet lane region of a gob-side entry retaining working face is realized;
s5, according to the pressure difference monitoring value of each measuring point of the return airway, the electro-hydraulic control automatic adjusting air window is adjusted, the air pressure of the return airway is automatically adjusted, the air pressure of each measuring point of the return airway is not lower than the air pressure of the gob, the minimum pressure difference value of each measuring point higher than the gob is not higher than 5-10 Pa, poisonous and harmful gas in the gob is prevented from flowing into the return airway and a large amount of air current in the return airway leaks into the gob, and secondary pressure equalizing of a gob-side entry retaining face 'return airway-gob' area is achieved.
2. The gob-side entry retaining face Y-shaped ventilation pressure regulating disaster prevention method according to claim 1, wherein in step S1, the first wind speed sensor signal is transmitted to the first PLC controller in real time, the first PLC controller controls the first frequency converter, and the first frequency converter adjusts the number of revolutions of the first local ventilator to adjust the air volume of the main air intake lane in real time; and signals of the second wind speed sensor are transmitted to the second PLC controller in real time, the second PLC controller controls the second frequency converter, and the second frequency converter adjusts the revolution of the second local ventilator to adjust the air quantity of the auxiliary air inlet lane in real time.
3. The gob-side entry retaining working face Y-shaped ventilation pressure regulating disaster prevention method according to claim 1, wherein in step S1, the first air door and the second air door are both provided with two air doors, and the distance from the first air door through which intake air passes to the air intake end of the air intake roadway is 10-20 m; in the first air door and the second air door, the distance between two air doors for passing through the vehicle is not less than the length of one mine car, and the distance between two air doors for passing through the pedestrian is not less than 5 m.
4. The Y-type ventilation, pressure regulation and disaster prevention method for gob-side entry retaining working face as claimed in claim 1, wherein in step S2, said third wind speed sensor is used for monitoring wind speed of return airway in real time, said gas sensor is used for monitoring gas concentration of return airway in real time, and said carbon monoxide sensor is used for monitoring carbon monoxide gas concentration of return airway in real time; wherein, the gas concentration overrun index is 1%, and the carbon monoxide gas concentration overrun index is 24 ppm.
5. The gob-side entry retaining face Y-shaped ventilation pressure regulating disaster prevention method according to claim 1, wherein in step S2, the differential pressure sensor is configured to monitor a differential pressure value between the return airway and the gob-side area, the differential pressure signal is transmitted to a third PLC controller provided in the return airway in real time, and the third PLC controller controls to change an opening of an electro-hydraulic control automatic regulating air window, so as to regulate the air pressure in the return airway in real time.
6. The gob-side entry retaining face Y-shaped ventilation pressure regulating disaster prevention method according to claim 1, wherein in step S4, the main air intake lane, the auxiliary air intake lane, the coal face, and the return air lane all should satisfy: the minimum wind speed is not lower than 0.25m/s, and the maximum wind speed is not higher than 4 m/s.
7. The gob-side entry retaining face Y-shaped ventilation pressure regulating disaster prevention method according to claim 1, wherein in the step 4, the pressure difference value between the air inlet end and the air return end of the coal face can be expressed as:
in the formula: delta PcThe pressure difference value of an air inlet end and an air return end of the coal mining working face is obtained; r is the wind resistance of the coal mining working face, and the wind resistance is considered to be constant in a certain period; qjThe air volume of the coal mining working face is the air volume of a main air inlet roadway; the pressure difference value delta P between the air inlet end and the air return end of the coal facecThe air quantity regulation range of the main air inlet lane to reach the minimum is as follows:
Q≤Qj≤(1～1.05)×Q
in the formula: q, the coal face reaches the basic air quantity required by the safety requirement; 1-1.05 is an allowable fluctuation coefficient for air quantity regulation of the main air inlet lane.
8. The gob-side entry retaining face Y-shaped ventilation pressure regulating disaster prevention method according to claim 1, wherein in step S5, the pressure difference monitoring values at each measuring point of the return airway from the electrohydraulic control automatic regulating windshield to the coal face are respectively set as: delta P1、ΔP2…ΔPnWherein the value measured by a differential pressure sensor arranged at the electro-hydraulic control automatic adjustment air window is used as delta P1It should satisfy: delta P1≥0、ΔP2≥0…ΔPnNot less than 0, and the minimum differential pressure value delta P in n measuring pointsminAnd the pressure is not higher than 5-10 Pa, so that the spontaneous combustion of the residual coal caused by a large amount of air flow leaking into the goaf of the return airway is avoided.
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| CN111594252B (en) * | 2020-05-26 | 2022-06-10 | 辽宁工程技术大学 | Prevention and control system and prevention and control method for spontaneous combustion of coal in goaf during mining of extremely spontaneous combustion coal seam |
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| JP4217958B2 (en) * | 2003-05-15 | 2009-02-04 | 清水建設株式会社 | Ventilation method in tunnel tunnel |
| CN100462523C (en) * | 2007-06-29 | 2009-02-18 | 淮南矿业(集团)有限责任公司 | Gob-side entry retaining Y-shaped ventilation goaf roof pressure relief gas extraction method |
| CN102425442B (en) * | 2011-11-10 | 2013-11-20 | 辽宁工程技术大学 | Variable-frequency regulation ventilation system and method for coal mining area |
| CN102777201B (en) * | 2012-07-26 | 2014-06-18 | 山东科技大学 | Ventilation method for exploiting short distance coal bed in fire zone based on positive pressure ventilation system |
| CN104481568B (en) * | 2014-09-15 | 2016-08-31 | 辽宁工程技术大学 | A kind of fully mechanized coal face gob side entry retaining technique and method of ventilation |
| CN104948215B (en) * | 2015-05-19 | 2016-05-25 | 卢新明 | A kind of excellent tuning control method of associating of mine ventilation system |
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