CN115013041A - Dynamic regulation and control device and method for efficient extraction of directional long drill hole of roof fracture zone - Google Patents
Dynamic regulation and control device and method for efficient extraction of directional long drill hole of roof fracture zone Download PDFInfo
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- CN115013041A CN115013041A CN202210664412.XA CN202210664412A CN115013041A CN 115013041 A CN115013041 A CN 115013041A CN 202210664412 A CN202210664412 A CN 202210664412A CN 115013041 A CN115013041 A CN 115013041A
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- 238000000605 extraction Methods 0.000 title claims abstract description 135
- 238000000034 method Methods 0.000 title claims abstract description 20
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 94
- 239000011148 porous material Substances 0.000 claims abstract description 14
- 230000001276 controlling effect Effects 0.000 claims abstract description 7
- 238000005457 optimization Methods 0.000 claims abstract description 6
- 230000001105 regulatory effect Effects 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims description 61
- 238000005553 drilling Methods 0.000 claims description 26
- 238000012806 monitoring device Methods 0.000 claims description 21
- 229910000831 Steel Inorganic materials 0.000 claims description 17
- 239000010959 steel Substances 0.000 claims description 17
- 230000005540 biological transmission Effects 0.000 claims description 15
- 238000010276 construction Methods 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 239000011083 cement mortar Substances 0.000 claims description 3
- 238000011084 recovery Methods 0.000 abstract 1
- 239000003245 coal Substances 0.000 description 9
- 238000005086 pumping Methods 0.000 description 7
- 239000011435 rock Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000004047 hole gas Substances 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000003993 interaction Effects 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
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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Abstract
The invention provides a device and a method for dynamically regulating and controlling the efficient extraction of directional long drill holes of fractured zones of a roof, which are used for calculating the mixed flow of extracted gas through the flow coefficient of a pore plate flowmeter and the monitored pressure difference value of two ends of the pore plate, calculating the extraction pure quantity of gas in the extracted gas according to the methane concentration value monitored by a methane sensor, regulating the extraction negative pressure by regulating the opening and closing angle of an adjustable electric control valve at set time intervals during the extraction process of the borehole, determining the orifice extraction negative pressure when the extraction pure quantity of the directional long drill holes of each fractured zone of the roof is maximum, regulating the extraction negative pressure of all the drill holes to the negative pressure value when the extraction pure quantity is maximum by utilizing a PLC (programmable logic controller) to regulate the extraction negative pressure of all the drill holes to the negative pressure value when the extraction pure quantity is maximum, thereby realizing the optimization of the extraction efficiency, and uniformly managing and controlling all the directional long drill holes of the fractured zones of the roof in a drill field, and effectively improving the extraction efficiency, and the safe recovery of the working face is ensured.
Description
Technical Field
The invention belongs to the technical field of coal mine roof fissure zone directional long borehole gas extraction, and particularly relates to a roof fissure zone directional long borehole high-efficiency extraction dynamic regulation and control device and method.
Background
The gas emission is one of important factors threatening the safety production of a coal mine, and is influenced by mining, a large number of cracks are generated on an overlying rock layer of a coal seam roof of a goaf, so that the air permeability of the rock layer is increased, and the gas passing rate is obviously enhanced. The "gas channels" formed by the overlying rock fractures allow gas to travel along the fractures and form gas-rich zones. Limited by the channel shape, secondary vortices will inevitably form at the upper corners. Along with the generation of secondary vortex, the flowing speed of gas is slowed down, and the gas in the vortex cannot flow out in time to generate aggregation, so that the gas concentration of an upper corner and a return airway is out of limit, and the construction safety of a coal face is influenced.
Aiming at the problem that the gas concentration of an upper corner and a return airway exceeds the limit, various treatment measures are provided, and the treatment measures mainly comprise modes of high-position pumping, high-position drilling, pipe burying extraction and the like. The high-pumping roadway has high pumping efficiency, but the engineering quantity is large, the construction period is long, and the input cost is too high. Gas extraction from high-position drill holes is relatively more economical, but when a conventional drilling machine is used for high-position drilling construction, the drilling track is not controlled and is influenced by factors such as geological conditions, gravity and the like, the drilling track is mostly parabolic, the invalid hole section is longer, and the extraction effect is general. The directional long drill hole of the coal seam roof fissure zone has the characteristics of accurate control of a drill hole track, high hole forming efficiency, short construction period and good extraction effect, and meanwhile, the construction can be carried out in a return airway drill field of a working face, so that the cost is low, and the directional long drill hole gas extraction process of the coal seam roof fissure zone is widely applied.
In the field application of directional long-drill-hole gas extraction in a coal seam roof fissure zone, the length of each directional drill hole is generally 500-600 m according to the field geological condition, 3-8 drill holes are generally constructed in each drill site according to the gas emission condition, and the drill holes are directly connected to an extraction pipe network for extraction after hole sealing after the construction of the drill holes. In the extraction process, each coal mine is often extracted by adopting constant extraction negative pressure, however, researches show that the flowing rule of gas in the coal seam is inevitably changed along with the increase of the gas extraction time, so that the adoption of the constant extraction negative pressure under different gas flowing conditions is not reasonable.
Disclosure of Invention
Based on the problems, the invention provides a dynamic regulation and control device and a method for efficient extraction of a directional long borehole in a roof fracture zone. The method comprises the steps of uniformly managing and controlling a plurality of directional long drill holes of fracture zones in a drill site, monitoring and analyzing extraction data of each drill hole, and adjusting extraction negative pressure of each drill hole to enable extraction quantity and methane concentration of the drill hole to be optimally matched and enable extraction pure quantity to be maximum, so that extraction efficiency of the whole drill site is optimal.
In order to achieve the purpose, the invention provides a dynamic regulation and control device for directional long-drilling efficient extraction of a roof fracture zone, which comprises: a pipeline monitoring device and a pipeline control device; the pipeline monitoring device comprises a rubber connecting hose, a negative pressure sensor, an adjustable electric control valve, a differential pressure sensor, an orifice plate flowmeter, a methane concentration sensor and a seamless steel pipe; one end of the rubber connecting hose is connected with the directional long drilling hole of the fractured zone through a flange plate, the other end of the rubber connecting hose is connected with the seamless steel pipe through the flange plate, the seamless steel pipe is sequentially connected or provided with a negative pressure sensor, an adjustable electric control valve, an orifice plate flowmeter and a methane concentration sensor from the drilling hole to the outside, and a differential pressure port of the orifice plate flowmeter is connected with a differential pressure sensor; the pipeline control device comprises a PLC, an AD conversion module, a DA conversion module, a display screen and a remote transmission module; PLC is connected with AD conversion module output, DA conversion module input, display screen input and teletransmission module input, and the AD conversion module input is connected with negative pressure sensor, differential pressure sensor, methane concentration sensor among the pipeline monitoring devices, and DA conversion module output is connected with the adjustable automatically controlled valve among the pipeline monitoring devices, and teletransmission module's output is connected with industry looped netowrk switch in the pit.
Furthermore, at least three directional long drill holes with top plate fracture zones are constructed in a single drill field, the AD conversion module is at least provided with nine analog signal input ports and is connected with nine sensors (the sensor arranged on each drill pipe is provided with a negative pressure sensor, a methane concentration sensor and a differential pressure sensor) arranged on three drill pipes, and a digital signal output port of the AD conversion module is connected with the PLC, so that analog signals of the sensors are converted into digital signals and then transmitted to the PLC; the DA conversion module is at least provided with three analog signal output ports and is connected with adjustable electric control valves arranged on three drilling pipelines, a digital signal input port of the DA conversion module is connected with the PLC, and the PLC outputs digital signals which are converted into analog signals through the DA conversion module and then drives the adjustable electric control valves to adjust the valve angles.
Furthermore, mixed gas pumped out from the directional long drilled hole in the top plate fractured zone enters a seamless steel pipe pumping pipeline through a rubber hose, a negative pressure sensor monitors the orifice pumping negative pressure in real time, an adjustable electric control valve can adjust the orifice pumping negative pressure through the opening and closing angle of a valve, the mixed flow of the pumped gas is determined through a differential pressure value monitored by a differential pressure sensor and an orifice plate coefficient of an orifice plate flowmeter, the methane concentration in the pumped mixed gas is measured through a methane concentration sensor, a PLC calculates the gas pumping pure quantity through the measured mixed flow and the methane concentration and uploads a display screen, and the display screen displays monitoring data of each sensor in real time.
Furthermore, the PLC adjusts the opening and closing degree of the adjustable electric control valve through the drive of the DA conversion module, further adjusts the orifice negative pressure, obtains the gas extraction pure quantity under different orifice negative pressure conditions, and achieves the optimal extraction efficiency of the directional long drill hole in the roof fracture zone, wherein the orifice negative pressure corresponding to the maximum gas extraction pure quantity is the optimal orifice extraction negative pressure.
Furthermore, the negative pressure sensor, the adjustable electric control valve, the differential pressure sensor, the methane concentration sensor and the orifice plate flowmeter in the pipeline monitoring device are all mine intrinsic safety devices.
Furthermore, the PLC, the AD conversion module, the DA conversion module, the display screen and the remote transmission module in the pipeline control device are all designed in an intrinsic safety type and are arranged in the intrinsically safe PLC control box.
Furthermore, the number of the drill holes in the same drill site is not limited to three, and when the number of the drill holes exceeds three, the number of the pipeline monitoring devices and the number of the ports of the AD conversion module and the DA conversion module in the pipeline control device are only required to be added.
The invention provides a dynamic regulation and control method for efficient extraction of directional long drill holes of a fractured zone of a roof, which is realized based on the dynamic regulation and control device for efficient extraction of the directional long drill holes of the fractured zone of the roof, and the regulation and control method comprises the following steps:
step 1, constructing a drill site in an underground working surface return air gateway, constructing directional long drill holes in a top plate fracture zone according to requirements in the drill site, and after the drill hole construction is finished, sealing the hole by using cement mortar and connecting the hole with a rubber connecting hose of a pipeline monitoring device through a flange plate;
step 7, the PLC adjusts the adjustable electric control valve to adjust the orifice extraction negative pressure of all the directional long drill holes in the fracture zone of the roof to the corresponding orifice extraction negative pressure when the gas extraction pure quantity of each drill hole is maximum through the DA conversion module, so that the optimization of the extraction efficiency in the current set time period is realized;
and 8, when the time reaches the next set time, the PLC repeats the processes from the step 4 to the step 7, and the extraction efficiency in the next time period is optimized.
The invention has the beneficial effects that:
the invention provides a device and a method for dynamically regulating and controlling the directional long drilling of a fractured zone of a roof, which are used for efficiently extracting and controlling gas, wherein a negative pressure sensor, an adjustable electric control valve, an orifice plate flowmeter, a methane concentration sensor and a differential pressure sensor are arranged on a seamless steel pipe, the mixed flow of extracted gas is calculated according to the flow coefficient of an orifice plate of the orifice plate flowmeter and the monitored differential pressure value of two ends of the orifice plate, the gas extraction pure quantity of the extracted gas is calculated according to the methane concentration value monitored by the methane concentration sensor, the extraction negative pressure is adjusted by adjusting the opening and closing angle of the adjustable electric control valve at set time intervals during the drilling and extraction process, the orifice negative pressure when the extraction pure quantity of the directional long drilling of each fractured zone of the roof is maximum is determined, the extraction negative pressure of all drill holes is adjusted to the negative pressure value when the extraction pure quantity is maximum by utilizing a PLC (programmable logic controller) to adjust the extraction negative pressures of all drill holes to the negative pressure value when the extraction pure quantity is maximum, thereby realizing the optimization of the extraction efficiency, the directional long drilling control system can uniformly control all directional long drilling holes of the roof fracture zone in one drilling field, can effectively improve the extraction efficiency, and ensures the safe extraction of a working face.
Drawings
FIG. 1 is a schematic structural diagram of a directional long-borehole high-efficiency extraction dynamic regulation and control device for a roof fracture zone in the invention;
FIG. 2 is a schematic view of the internal functional structure of the pipeline control device according to the present invention;
in the figure, 1, a rubber connecting hose; 2. a flange plate; 3. a negative pressure sensor; 4. an adjustable electrically controlled valve; 5. a differential pressure sensor; 6. an orifice plate flowmeter; 7. a methane concentration sensor; 8. seamless steel pipes; 9. an intrinsically safe PLC control box; 10. a display screen; 11. a PLC; 12. an AD conversion module; 13. a DA conversion module; 14. a remote transmission module; 15. and (5) a mine extraction pipe network.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
As shown in fig. 1-2, the high-efficiency extraction dynamic regulation and control device for the directional long drill hole of the roof fracture zone, provided by the invention, comprises a pipeline monitoring device and a pipeline control device; the pipeline monitoring device comprises a rubber connecting hose 1, a flange plate 2, a negative pressure sensor 3, an adjustable electric control valve 4, a differential pressure sensor 5, an orifice plate flowmeter 6, a methane concentration sensor 7 and a seamless steel pipe 8; one end of the rubber connecting hose 1 is connected with a directional long drilling hole of a fractured zone through the flange plate 2, the other end of the rubber connecting hose is connected with a seamless steel pipe 8 through the flange plate 2, the seamless steel pipe 8 is sequentially connected or provided with the negative pressure sensor 3, the adjustable electric control valve 4, the orifice plate flowmeter 6 and the methane concentration sensor 7 from the drilling hole to the outside in sequence, a differential pressure port of the orifice plate flowmeter 6 is connected with the differential pressure sensor 5, and the differential pressure sensor is arranged at a differential pressure port of the orifice plate flowmeter 6. The orifice plate flowmeter is provided with two small holes for monitoring the pressure difference between the front and the back of the orifice plate, the differential pressure sensor is provided with two pressure input ports, the two ports are connected with the two small holes on the orifice plate flowmeter for monitoring the pressure difference between the front and the back of the orifice plate in the orifice plate flowmeter, and the pressure difference value can calculate the gas flow passing through the orifice plate flowmeter.
The pipeline control device comprises a PLC11, an AD conversion module 12, a DA conversion module 13, a display screen 10 and a remote transmission module 14. PLC11 is the master control core, respectively with AD conversion module 12 output, DA conversion module 13 input, display screen 10 input and the 14 inputs of remote transmission module are connected, AD conversion module 12 input is connected with negative pressure sensor 3 among the pipeline monitoring devices, differential pressure sensor 5, methane concentration sensor 7, DA conversion module 13 output is connected with adjustable automatically controlled valve 4 among the pipeline monitoring devices, remote transmission module 14's output is connected with industry looped netowrk switch in the pit.
At least three directional long drill holes of the roof fissure zones are constructed in a single drill field, the AD conversion module 12 is at least provided with nine analog signal input ports which are connected with nine sensors arranged on three drill hole pipelines, and a digital signal output port of the AD conversion module 12 is connected with the PLC11, converts analog signals output by the sensors into digital signals and transmits the digital signals to the PLC 11; the DA conversion module 13 is at least provided with three analog signal output ports which are connected with the adjustable electrically controlled valves 4 arranged on the three drilling pipelines, the digital signal input port of the DA conversion module 13 is connected with the PLC11, and the digital signal output by the PLC11 is converted into an analog signal by the DA conversion module 13 and then drives the adjustable electrically controlled valves 4 to adjust the valve angle.
The mixed gas pumped out from the directional long drill hole in the top plate fracture zone enters an extraction pipeline connected with a seamless steel pipe 8 through a rubber connecting hose 1, an orifice extraction negative pressure is monitored by a negative pressure sensor 3 in real time, the adjustable electric control valve 4 can adjust the orifice extraction negative pressure through the valve opening and closing angle, the pumped mixed gas is calculated through an orifice plate flowmeter 6 and a differential pressure sensor 5 to obtain the flow of the pumped mixed gas, and the calculation formula is as follows:
in the formula, Q is the flow of the extracted mixed gas, K is the coefficient of the orifice flowmeter 6 after calibration, and Delta P is the monitoring of the differential pressure sensorThe pressure differential across the orifice of the orifice meter. The methane concentration in the extracted mixed gas is measured by the methane concentration sensor 7, the PLC11 calculates the gas extraction pure quantity according to the measured flow of the extracted mixed gas and the methane concentration in the mixed gas, and the calculation formula is as follows: q Pure Q · C, wherein Q Pure The gas extraction pure quantity is Q, the flow of the extracted mixed gas is Q, and the concentration of methane in the mixed gas is C. The display screen 10 displays the monitoring data of each sensor in real time.
The PLC11 drives the adjustable electric control valve 4 to adjust the opening and closing degree through the DA conversion module 13, so that the orifice negative pressure is adjusted, the gas extraction pure quantity under different orifice negative pressure conditions is obtained, the optimal orifice extraction negative pressure is finally determined, and the extraction efficiency optimization of the directional long drill hole in the roof fracture zone is realized.
In this embodiment, the negative pressure sensor 3, the adjustable electric control valve 4, the differential pressure sensor 5, the orifice plate flowmeter 6, and the methane concentration sensor 7 in the pipeline monitoring device are all mining intrinsically safe devices.
In this embodiment, the PLC11, the AD conversion module 12, the DA conversion module 13, the display screen 10, and the remote transmission module 14 in the pipeline control device are all designed in an intrinsic safety type and are placed in the intrinsically safe PLC control box 9.
In this embodiment, the number of drill holes in the same drill site is not limited to three, and when the number of drill holes exceeds three, the number of pipeline monitoring devices and the number of ports of the AD conversion module 12 and the DA conversion module 13 in the pipeline control device need only be increased.
The invention provides a dynamic regulation and control method for efficient extraction of directional long drill holes of a fractured zone of a roof, which is realized based on the dynamic regulation and control device for efficient extraction of the directional long drill holes of the fractured zone of the roof, and the regulation and control method comprises the following steps:
step 1, constructing a drill site in an underground working face air return gateway, constructing directional long drill holes in a roof fracture zone according to requirements in the drill site, sealing the holes by using cement mortar after the drill hole construction is finished, and then connecting the holes with a rubber connecting hose 1 of a pipeline monitoring device through a flange plate 2.
And 2, the mixed gas in the drilled hole enters the seamless steel pipe 8 through the rubber connecting hose 1 under the action of extraction negative pressure, the negative pressure sensor 3 monitors the negative pressure of the hole opening in real time, the methane concentration sensor 7 monitors the methane concentration of the extracted mixed gas in real time, and the differential pressure sensor 5 monitors the differential pressure at two ends of the pore plate flowmeter 6 in real time.
And 4, controlling the adjustable electric control valve 4 by the PLC11 through the DA conversion module 13 at set time (manually set, generally at intervals of 24 hours) to adjust the opening and closing degree of the adjustable electric control valve from 0 degree to 90 degrees, and adjusting the step pitch to 1 degree. Each extraction drill hole needs to be adjusted independently, and other drill holes are in a closed state during adjustment. When the adjustable electric control valve 4 is adjusted by 1 degree, the PLC11 records the orifice extraction negative pressure, the flow of the extracted mixed gas, the methane concentration in the extracted mixed gas and the gas extraction pure quantity under the current valve opening and closing degree.
And 6, aiming at each roof fracture zone directional long borehole, comparing the orifice extraction negative pressure and the gas extraction pure quantity value corresponding to each angle by the PLC11 in the adjustment process of the adjustable electric control valve 4 at 0-90 degrees, and determining the orifice extraction negative pressure corresponding to the maximum gas extraction pure quantity value. The information is displayed on a display screen 10(MCGS series man-machine interaction display screen) and is transmitted into the mine ring network switch through a remote transmission module 14.
And 7, the PLC11 adjusts the adjustable electric control valve 4 through the DA conversion module 13(EM AQ series DA conversion module) to adjust the orifice extraction negative pressure of all the directional long drill holes in the fracture zone of the roof to the corresponding orifice extraction negative pressure when the gas extraction pure value of each drill hole is maximum, so that the optimization of the extraction efficiency in the current set time period is realized.
And 8, when the time reaches the next set time (manually set, generally 24 hours), the PLC11 repeats the processes from the step 4 to the step 7, and the extraction efficiency in the next time period is optimized.
Claims (8)
1. The utility model provides a roof fissure area directional long drilling high efficiency is taken out and is adopted dynamic regulation and control device which characterized in that includes: a pipeline monitoring device and a pipeline control device; the pipeline monitoring device comprises a rubber connecting hose, a negative pressure sensor, an adjustable electric control valve, a differential pressure sensor, an orifice plate flowmeter, a methane concentration sensor and a seamless steel pipe; one end of the rubber connecting hose is connected with the directional long drilling hole of the fractured zone through a flange plate, the other end of the rubber connecting hose is connected with the seamless steel pipe through the flange plate, the seamless steel pipe is sequentially connected or provided with a negative pressure sensor, an adjustable electric control valve, an orifice plate flowmeter and a methane concentration sensor from the drilling hole to the outside, and a differential pressure port of the orifice plate flowmeter is connected with a differential pressure sensor; the pipeline control device comprises a PLC, an AD conversion module, a DA conversion module, a display screen and a remote transmission module; PLC is connected with AD conversion module output, DA conversion module input, display screen input and teletransmission module input, and the AD conversion module input is connected with negative pressure sensor, differential pressure sensor, methane concentration sensor among the pipeline monitoring devices, and DA conversion module output is connected with the adjustable automatically controlled valve among the pipeline monitoring devices, and teletransmission module's output is connected with industry looped netowrk switch in the pit.
2. The dynamic regulation and control device for the directional long drilling of the roof fracture zone for high-efficiency extraction according to claim 1, characterized in that at least three directional long drilling holes of the roof fracture zone are constructed in a single drilling field, the AD conversion module is at least provided with nine analog signal input ports and is connected with nine sensors arranged on three drilling pipelines, and a digital signal output port of the AD conversion module is connected with a PLC (programmable logic controller), so that analog signals of the sensors are converted into digital signals and then transmitted to the PLC; the DA conversion module is at least provided with three analog signal output ports and is connected with adjustable electric control valves arranged on three drilling pipelines, a digital signal input port of the DA conversion module is connected with the PLC, and the PLC outputs digital signals which are converted into analog signals through the DA conversion module and then drives the adjustable electric control valves to adjust the valve angles.
3. The dynamic regulation and control device for the directional long drill hole efficient extraction of the roof fracture zone as claimed in claim 1, is characterized in that mixed gas extracted from the directional long drill hole of the roof fracture zone enters a seamless steel pipe extraction pipeline through a rubber hose, a negative pressure sensor monitors the extraction negative pressure of an orifice in real time, an adjustable electric control valve can adjust the extraction negative pressure of the orifice through the opening and closing angle of a valve, the mixed flow of the extracted gas is determined through a differential pressure value monitored by a differential pressure sensor and an orifice coefficient of an orifice flowmeter, the methane concentration in the extracted mixed gas is measured by a methane concentration sensor, a PLC calculates the pure gas extraction amount through the measured mixed flow and the methane concentration and uploads a display screen, and the display screen displays the monitoring data of each sensor in real time.
4. The device for dynamically regulating and controlling the efficient extraction of the directional long drill hole of the fractured zone of the roof as claimed in claim 1, wherein the PLC drives and adjusts the opening and closing degree of the adjustable electric control valve through the DA conversion module, so as to adjust the orifice negative pressure, obtain the gas extraction pure quantity under different orifice negative pressure conditions, and the corresponding orifice negative pressure is the optimal orifice extraction negative pressure when the gas extraction pure quantity is the maximum value, so that the extraction efficiency of the directional long drill hole of the fractured zone of the roof is optimized.
5. The dynamic regulation and control device for directional long-borehole high-efficiency extraction in the roof fissure zone according to claim 1, wherein the negative pressure sensor, the adjustable electric control valve, the differential pressure sensor, the methane concentration sensor and the orifice plate flowmeter in the pipeline monitoring device are all mine intrinsic safety devices.
6. The dynamic regulation and control device for directional long-borehole high-efficiency extraction in the roof fracture zone as claimed in claim 1, wherein the PLC, the AD conversion module, the DA conversion module, the display screen and the remote transmission module in the pipeline control device are all designed in intrinsic safety type and are placed in an intrinsically safe PLC control box.
7. The dynamic regulation and control device for directional long-drill-hole efficient extraction in the fractured zone of the roof as claimed in claim 1, wherein the number of drill holes in the same drill site is not limited to three, and when the number of drill holes exceeds three, the number of pipeline monitoring devices and the number of ports of AD conversion modules and DA conversion modules in the pipeline control device are only added.
8. A dynamic regulation and control method for efficient extraction of directional long drilled holes of a fractured zone of a roof is realized based on the dynamic regulation and control device for efficient extraction of the directional long drilled holes of the fractured zone of the roof, and is characterized by comprising the following steps of:
step 1, constructing a drill site in an underground working surface return air gateway, constructing directional long drill holes in a top plate fracture zone according to requirements in the drill site, and after the drill hole construction is finished, sealing the hole by using cement mortar and connecting the hole with a rubber connecting hose of a pipeline monitoring device through a flange plate;
step 2, the mixed gas in the drilled hole enters the seamless steel pipe through the rubber connecting hose under the action of extraction negative pressure, a negative pressure sensor monitors the negative pressure of an orifice in real time, a methane concentration sensor monitors the methane concentration in the extracted mixed gas in real time, and a differential pressure sensor monitors the differential pressure at two ends of a pore plate of the pore plate flowmeter in real time;
step 3, converting analog data monitored by various sensors in real time into digital signals by an AD conversion module, transmitting the digital signals to a PLC (programmable logic controller), displaying the monitored data on a display screen in real time by the PLC, calculating the flow of the extracted mixed gas by the PLC according to the flow coefficient of the pore plate and the monitored pressure difference value of two ends of the pore plate, calculating the gas extraction pure quantity in the extracted gas according to the methane concentration value monitored by the methane concentration sensor, and displaying the gas extraction pure quantity on the display screen; meanwhile, the PLC accesses all real-time monitored and calculated data into the mine looped network switch through a remote transmission module for a ground system to acquire the data;
step 4, the PLC controls the adjustable electric control valve through the DA conversion module within the set time, so that the opening and closing degree of the adjustable electric control valve is adjusted from 0 degree to 90 degrees, and the step pitch is adjusted to 1 degree; each extraction drill hole needs to be independently adjusted, and other drill holes are in a closed state during adjustment; when the adjustable electric control valve is adjusted by 1 degree, the PLC records the orifice extraction negative pressure, the flow of the extracted mixed gas, the methane concentration in the extracted mixed gas and the gas extraction pure quantity under the current valve opening and closing degree;
step 5, repeating the step 4, adjusting the directional long drill hole of each roof fissure zone, and recording the opening degree of the valve and the corresponding extraction negative pressure, extraction gas mixed flow and gas extraction pure quantity under the opening degree;
step 6, aiming at each roof fracture zone directional long drilled hole, comparing the orifice extraction negative pressure and the gas extraction pure quantity value corresponding to each angle by the PLC in the adjusting process of the adjustable electric control valve at 0-90 degrees, and determining the orifice extraction negative pressure corresponding to the maximum gas extraction pure quantity; displaying the information on a display screen and transmitting the information into a mine ring network switch through a remote transmission module;
step 7, the PLC adjusts the adjustable electric control valve to adjust the orifice extraction negative pressure of the directional long drill holes of all the roof fissure zones to the corresponding orifice extraction negative pressure when the gas extraction pure quantity of each drill hole is maximum through the DA conversion module, and the optimization of the extraction efficiency in the current set time period is realized;
and 8, when the time reaches the next set time, the PLC repeats the processes from the step 4 to the step 7, and the extraction efficiency in the next time period is optimized.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210664412.XA CN115013041A (en) | 2022-06-14 | 2022-06-14 | Dynamic regulation and control device and method for efficient extraction of directional long drill hole of roof fracture zone |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210664412.XA CN115013041A (en) | 2022-06-14 | 2022-06-14 | Dynamic regulation and control device and method for efficient extraction of directional long drill hole of roof fracture zone |
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| CN115013041A true CN115013041A (en) | 2022-09-06 |
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| CN202210664412.XA Pending CN115013041A (en) | 2022-06-14 | 2022-06-14 | Dynamic regulation and control device and method for efficient extraction of directional long drill hole of roof fracture zone |
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