1486results about "Gas removal" patented technology

A downhole extraction pipeline blockage clearing system, comprising a blockage clearing apparatus (1), a direction changing and impurity removal integrated apparatus (2), an impurity removal apparatus (3), and a floating ball control mechanism; the blockage clearing apparatus (1) utilizes a self-advancing blockage clearing spray head (5), which has self-rotation and self-advancing functions and utilizes a high pressure jet to actively clean a pipeline, thus improving the efficiency and effect of blockage clearing; the direction changing and impurity removal integrated apparatus (2) can implement direction changing for and transport of the blockage clearing apparatus (1), conveniently adjusts the direction of entry of the blockage clearing apparatus (1) into an extraction pipeline, and adapts to different extraction pipeline arrangements; the impurity removal apparatus (3) can implement simultaneous online cleaning and impurity removal, improving blockage clearing efficiency and reducing manual operation; additionally, the floating ball control mechanism is also utilized, and a plurality of one-way valves are jointly controlled by means of buoyancy and changes in pressure differences, thereby implementing impurity removal automation. The extraction pipeline does not need to be closed during a blockage clearing procedure.

The invention relates to the technical field of gas extraction drilling machine vibration signal processing, in particular to a gas extraction drilling machine vibration signal self-adaptive noise reduction method based on multi-scale feature fusion. The method comprises the steps of collecting a vibration signal, converting the vibration signal into a two-dimensional waveform image, recognizing a drilling working condition area, constructing a multi-scale objective function to optimize VMD parameters, decomposing the signal and screening a dominant IMF component for reconstruction. Through multi-objective optimization and multi-feature fusion strategies of energy distribution and transient impact characteristics, the problems that in a traditional method, the noise reduction effect is poor, and the coal rock character recognition precision is insufficient are solved, the waveform similarity, the power spectrum density coincidence degree and the correlation coefficient are remarkably improved, and reliable guarantee is provided for coal mine safety production.

The present invention relates to a downhole extraction pipeline blockage clearing apparatus, comprising a frame, a hose wind-up apparatus, an advancing apparatus, a high pressure pump set, a hydraulic pipe, a self-advancing blockage clearing spray head, and a control system; the hose wind-up apparatus, the advancing apparatus, and the high pressure pump group are all connected to the control system and are controlled by the control system; the hydraulic hose is wound on the hose wind-up apparatus, and wind-up of the hydraulic hose is implemented by means of rotation of the hose wind-up apparatus; the advancing apparatus is located at one side of the hose wind-up apparatus, jointly moves with the hose wind-up apparatus, and holds and transports the hydraulic hose to enter into an extraction pipeline; one end of the hydraulic hose is connected to the high pressure pump group, and the other end is connected to the self-advancing blockage clearing spray head; and the self-advancing blockage clearing spray head performs blockage clearing within the extraction pipeline by means of a jet stream and by means of the high pressure pump group conveying high pressure water to the self-advancing blockage clearing spray head. The spray head of the present invention possesses self-rotation and self-advancing functions, the effect and efficiency of blockage clearing are improved, and manual operation becomes less intensive; and the hose wind-up apparatus and the advancing apparatus implement automated wind-up and transport of the hydraulic hose, preventing the hydraulic hose from becoming tangled and damaged.

The invention relates to a coal seam extraction drilling air bag type memory metal net cover hole collapse prevention device and method, the device comprises an I-type air bag net cover installation unit body, a plurality of II-type air bag net cover installation unit bodies and an inflator pump, an exhaust pipeline is provided with an exhaust control valve, a hole wall is supported through a memory metal net cover, and the air bag net cover installation unit body and the inflator pump are arranged in the hole wall; the memory metal net sleeves can be matched with drill holes with different hole diameters in a self-adaptive mode and can be repeatedly used, the configuration number of the memory metal net sleeves can be greatly reduced, and therefore the processing cost of hole collapse prevention is further reduced; the installation of the memory metal net sleeve is directly controlled by the expansion of the air bag, so that the memory metal net sleeve can be quickly unfolded and reliably contacted with the hole wall; the removal of the memory metal net sleeve is directly controlled by temperature control gas, so that the memory metal net sleeve retracts to an initial state at the recovery temperature and is separated from the hole wall; the mounting and dismounting process of the memory metal net cover has the advantages of being simple, efficient and easy to operate, and the construction efficiency can be further improved.

The invention belongs to the technical field of coal mine safety, and relates to drilling construction equipment with drilling cooperating with reciprocating impact and a coal seam gas extraction method. The impact fracturing assembly comprises an impact drill bit, a reciprocating impact rod and a rotary transmission rod; the middle of the reciprocating impact rod is slidably sleeved with a first positioning block. The reciprocating impact rod is provided with a straight groove arranged in the axial direction, and the straight groove is matched with a linear protrusion in the first positioning block. A movable block is fixedly arranged at the other end of the reciprocating impact rod, one side of the movable block is attached to the inner wall of a groove in the end drill rod, and the other side of the movable block is attached to an annular double-arrow-shaped groove formed in the rotation transmission rod. The rotation transmission rod is axially limited through a second positioning block arranged on the rotation transmission rod in a sleeving mode. One end of the spiral drill rod is connected with the end drill rod, and a universal coupling is movably arranged in the spiral drill rod; the other end of the rotary transmission rod is connected with one end of a universal coupling, and one end of the universal coupling is detachably connected with a tail connector through the tail end of a spiral drill rod.

The invention provides a coal mine gas extraction management and control method and system based on transparent geology, and the method comprises the following steps: integrating multi-source geological data, and constructing a transparent geological model which can reflect the actual geological condition in real time; based on geological information provided by the transparent geological model, calculating and optimizing key parameters of a drill hole in combination with coal and rock seeing parameters of a constructed drill hole to obtain preset drill hole design parameters; construction parameters and drilling parameters of drilling machine equipment are collected in real time; the drilling parameters are compared with the preset drilling design parameters; meanwhile, the drilling construction quality is analyzed and evaluated according to the construction parameters and the drilling parameters; and an extraction effect evaluation model and an extraction effect prediction model are constructed, gas parameters are collected in real time, and the gas extraction effect is evaluated. By means of the transparent geologic model, intelligent control over the whole coal mine gas extraction process is achieved.

The invention belongs to the field of coal mine rock burst and gas control, and relates to a high-gas coal seam mining method with cooperation of hydraulic fracturing pressure relief and high drainage roadway, which comprises the following steps: constructing a trend high drainage roadway, and constructing a hydraulic fracturing drill hole and fracturing in an air return crossheading; constructing layer-crossing drilling holes from the trend high drainage roadway to the air return crossheading; tunneling an air return crossheading and ventilating; performing hydraulic fracturing drilling and fracturing in the open-off cut; constructing a layer-penetrating hole from the end part of the trend high drainage roadway to the open-off cut; tunneling a cut hole and ventilating; the air return crossheading is connected with the air return main roadway; bedding drilling and fracturing are carried out in self-air-return crossheading construction; and hydraulic fracturing drilling and fracturing are conducted on the transportation crossheading, the transportation crossheading is tunneled and ventilated, and working face stoping is conducted. Pressure relief is carried out before roadway tunneling, a smooth air flow path can be formed before roadway tunneling and in the tunneling process to extract gas, newly generated gas on a tunnel face can be rapidly extracted, gas extraction can be continuously carried out during stoping, and safety of the whole production process is guaranteed.

The invention provides an underground coal mine air and water pumping switching electro-hydraulic control system and method, the electro-hydraulic control system comprises an air supply control module, a water supply control module, a negative pressure control module and an oil supply module, and the method adopts a remote control system to control the underground coal mine air and water pumping switching electro-hydraulic control system. According to the underground coal mine air and water pumping switching electro-hydraulic control system, air and water pumping electric control rapid opening and closing and rapid switching of different functions are achieved, the automation degree of air and water pumping switching is improved, and the air and water pumping switching time is shortened; and meanwhile, when dangerous working conditions that gas accumulation exceeds the limit due to hole blocking behind the drill hole or carbon monoxide gas appears in the drill hole and the like, rapid and automatic response processing can be achieved. The air and water pumping conversion efficiency is improved, the labor intensity of workers is relieved, and key technical support is provided for coal mine underground automatic drilling whole-process operation.

The invention provides a coal mine ventilation air methane synergistic enrichment and fluidized heat storage combustion system and method. The system comprises an air shaft diffusion tower and a ventilation air methane collecting device, the method comprises the following steps: collection and compression of ventilation air methane, cooling and boosting adsorption of an adsorption tower, pressure drop equalization of the adsorption tower, temperature rise, pressure reduction and desorption of the adsorption tower, pressure rise equalization of the adsorption tower, periodic cycle work of the adsorption tower, preheating of a packed bed of a heat storage furnace, fluidized heat storage oxidation of coal gangue and gas, and waste heat recovery and utilization. According to the invention, safe and efficient enrichment of ventilation air methane can be realized, and fluidized heat storage oxidation coupling utilization of concentrated gas and coal gangue particles can be realized; the oxidation waste heat is used as a generator heat source; the carbon reduction scheme of large-scale separation and concentration-synergistic oxidation-efficient utilization of the oversize coal mine ventilation air methane is formed, the coal industry is assisted to achieve the goal of'two wastes' and sustainable development, and large-flow, low-cost, safe and efficient treatment and utilization of the ventilation air methane discharged by an oversize low-gas mine can be achieved.

The invention discloses a coal seam group occurrence three-area linkage gas extraction method. Firstly, a coal seam is divided into an underground coal gasification area, a pressure relief permeability increasing area and an original extraction area; in the initial stage of underground coal gasification, in the process that high-temperature combustible gas generated by underground coal gasification is injected into a ground drilling well, the high-temperature combustible gas and a coal body are subjected to heat transfer, so that the temperature of the coal body is increased, and gas desorption is enhanced; under the continuous coupling action of high temperature and high pressure of the high-temperature combustible gas, the permeability of the coal body is improved; in the process that high-temperature combustible gas is injected into the ground drilling well, gas extraction is continuously conducted on other adjacent drilling holes; under the condition that gas injection and gas extraction are sequentially and circularly performed in ground drilling, the coal body is circularly impacted by positive pressure-negative pressure alternating aerodynamic force, and further fracturing of the coal body is facilitated; under the triple effects of high-temperature coal body gas desorption strengthening, coal body permeability increasing and gas displacement, large-flow and high-quality extraction of deep coal seam gas is finally achieved.

The invention relates to the technical field of coal bed gas development and gas extraction, in particular to an electrodialysis-liquid CO2 time sequence synergistic anti-reflection method and system. Comprising an electrodialysis pretreatment stage, a CO2 synergetic permeability increasing stage and a process regulation and energy recovery stage, a mixed solution is injected into a coal seam in a pulse injection mode, and energy recovery is conducted through pipeline fluid pressure in the injection stopping period. According to the technical scheme, through multi-stage cooperation of electrodialysis pretreatment, CO2 phase change fracturing and pulse consolidation and regulation, accurate transformation of the coal seam low-permeability area is achieved. According to the scheme, electrodialysis is utilized to drive an acidic working solution to target and migrate to a difficult-to-permeate area, mineral substances are dissolved, and pores are expanded; then, high-energy expansion stress is generated through liquid CO2 phase change, and a through fracture network is formed; and finally, a pulse injection and energy recovery mechanism is adopted, fracture closing is restrained, system energy consumption is reduced, and therefore the coal seam breathability and the gas extraction efficiency are integrally improved.

The utility model relates to the technical field of gas extraction, in particular to an underground gas extraction blowout preventer, and mainly solves the technical problems that the existing gas extraction blowout preventer is high in spewing control difficulty, high in safety risk and high in sprayed slag cleaning workload. The device comprises a movable chassis, a deslagging box, a multi-way pipe, a drilling machine through pipe, a coal seam drilling pipe, a negative pressure pipe, a pressure relief buffer cover, a deslagging pipe and a pressure sensor. According to the device, gushing is detected through the pressure sensor, on-off of the negative pressure pipe and the slag discharging pipe is controlled in a feedback mode, dependence on manual experience is not needed, it can be guaranteed that gushing and corresponding equipment are started consistently, and the gushing control difficulty is greatly reduced; meanwhile, water and residual materials for slag spraying can be discharged into the slag discharging box through the slag discharging pipe in time to be collected, and the workload of slag spraying and cleaning is reduced; the device is further provided with a pressure relief buffer cover, when the pressure is too large due to gushing, buffering can be conducted through the pressure relief buffer cover, and damage to the device caused by the too large pressure is avoided.

The invention discloses a gas extraction method based on a transparent gas geologic model, and relates to the field of mine extraction. Comprising the following steps: acquiring geological basic information through a plurality of geological monitoring systems; performing exploration line sectioning on the initial geological model, connecting a triangulation network according to the geological trend, constructing a closed geological contour line, forming a solid model, performing solid model fusion, and establishing a basic geological model; the method comprises the following steps: acquiring gas monitoring information through a plurality of gas monitoring systems, and constructing a transparent gas geologic model; constructing a gas extraction decision model according to the transparent gas geologic model; and obtaining a gas extraction scheme based on the gas extraction decision model according to gas extraction requirements. According to the method, the gas extraction scheme is obtained through the model, the defect that decision making completely depends on human experience is overcome, the scientificity of obtaining the gas extraction scheme is improved, and a reliable basis is provided for gas extraction operation of workers.

The utility model discloses a roof strike relay drill hole arrangement structure for extracting goaf gas, and belongs to the technical field of extraction drill holes. A plurality of groups of drill holes are obliquely formed between a top plate and a bending sinking zone; each group of drill holes comprises a plurality of upper-row drill holes and a plurality of lower-row drill holes; the hole forming positions of the plurality of upper-row drill holes and the plurality of lower-row drill holes in each group are the same point, and the final hole positions of the plurality of upper-row drill holes and the plurality of lower-row drill holes in each group are located in the boundary area of the fissure zone and the bending sinking zone; the length of the lower row of drill holes in each group is greater than that of the upper row of drill holes; the lower row of drill holes in the front group and the upper row of drill holes in the rear group are partially overlapped; according to the utility model, the problems of high cost, long construction period and complex management caused by lifting the drill site into the coal seam roof are solved, and the extraction effect is ensured.

The invention discloses a gas extraction dynamic regulation and control system and method based on three-dimensional modeling, and relates to the technical field of three-dimensional modeling, and the method comprises the steps: constructing an underground multi-source sensor network, and collecting underground gas extraction multi-modal data flow; the method comprises the following steps: acquiring an underground gas historical extraction data set, performing dynamic early warning analysis in combination with an underground gas extraction multi-modal data flow, and establishing a gas emission abnormity early warning model and an extraction system failure early warning model; self-adaptive fusion modeling is carried out, and a three-dimensional model of the extraction drilling system is generated; and the gas emission abnormity early warning model and the extraction system failure early warning model are mapped to the extraction drilling system three-dimensional model for extraction regulation and control analysis to determine target gas extraction control parameters, and extraction closed-loop regulation and control are carried out. The technical problem of monitoring and regulation response lag caused by gas extraction data islanding in the prior art is solved, and the technical effects of real-time sensing, intelligent early warning and accurate regulation in the gas extraction process are achieved.

The invention discloses a method for rapidly and efficiently extracting coal mine gas in a broken and soft coal seam, and belongs to the technical field of coal seam gas development and coal mine gas prevention and control. According to the method, geological features of a coal mining planning area are determined, a ground U-shaped well and underground bottom-pumped rock drift layer-crossing drilling combined treatment system is deployed, and regional large-scale treatment is achieved in a well factory mode; the fracturing transformation range and the fracturing fluid distribution characteristics are detected by using a ground and underground combined micro-seismic monitoring and underground transient electromagnetic method, and the arrangement of layer-crossing drill holes is optimized; dividing the cross-layer drill holes into drainage holes and air exhaust holes, and formulating a collaborative extraction system in combination with different drainage and extraction stages; the method solves the problems that broken soft coal seam gas extraction is low in efficiency and long in period, and treatment blind areas exist, treatment time is remarkably shortened, cost is reduced, and safe and efficient production of a coal mine is guaranteed.

Disclose is a separator for separating liquid from a fluid stream including a mixture of gas and liquid. The separator comprises a first vessel including an outlet and an inlet for receiving the fluid stream, the first vessel in fluid communication with a second vessel via a first valve, the second vessel in fluid communication with a liquid outlet via a second valve, wherein the first vessel is arranged to enable the liquid to flow into the second vessel. The separator also has a second valve for controlling release of liquid from the second vessel, the first and second valves being pneumatically operated, the pneumatic operation of the first and second valves allowing only one of the first and second valves to be open during operation of the separator.

The invention relates to the technical field of mine underground equipment, in particular to crawler-type high-gas coal seam drilling equipment based on a double-channel drill rod, which comprises a walking chassis, the double-channel drill rod, a hydraulic slotting system and a negative pressure deslagging device. Crawler-type composite drilling equipment is provided, process integration is carried out through breakthrough of three core technologies, directional drilling (a diamond drill bit and a spiral groove drill rod), hydraulic slotting and negative pressure deslagging are integrated into single equipment, the working procedure switching time is shortened, synchronous slotting and deslagging operation is achieved through a double-channel drill rod, and the working efficiency is improved. The problems of energy consumption and blockage are solved; and meanwhile, gas accidents are prevented.

The present invention discloses a coal mine gas extraction and sealing device, which relates to the technical field of gas extraction; it comprises a sealing tube; an inner liner is provided in the sealing tube, and the inner liner is connected to a drill hole for gas extraction; a locking assembly and an extrusion assembly are provided in a cavity between the inner liner and the sealing tube; a through hole is provided on the tube wall of the sealing tube; the locking assembly is movably connected to the inner wall of the sealing tube; the extrusion assembly comprises a rotating rod movably connected to the sealing tube; the rotating rod is connected to an extrusion block in contact with the locking assembly; the extrusion block is pushed by the rotating rod to extend or retract the locking assembly from the through hole; the present invention ensures that the sealing tube can be in a static and stable sealing state by arranging the extrusion assembly and the locking assembly in the sealing tube, thereby enhancing the effect of gas extraction and sealing.

The coal mine underground self-adaptive drilling blowout preventer comprises a drill rod, a supporting sleeve, a piston, a plugging sleeve and a hydraulic oil control assembly, the supporting sleeve is rotatably arranged on the drill rod in a sleeving mode, and a sliding groove extending in the axial direction of the drill rod is formed in the first end face of the supporting sleeve; the piston is arranged in the sliding groove in a sliding mode in the axial direction of the drill rod, a hydraulic oil cavity is defined between the piston and the inner wall of the sliding groove, the drill rod is sleeved with the plugging sleeve, and a sealing cavity is defined between the plugging sleeve and the drill rod. In the moving drilling process of the drill rod, the position of the plugging sleeve can be adjusted in a self-adaptive mode, a drilled hole is sealed in real time, and the hole spraying phenomenon is avoided. By means of the method, gas concentration overrun can be avoided, the gas explosion risk is increased, and even gas explosion accidents are caused, and the drilling safety is high. In addition, the dust concentration in the air can be prevented from rising in the drilling process, and the occupational health of operators is effectively guaranteed.

The invention relates to the field of coal seam anti-reflection, and particularly discloses a coal seam carbon dioxide and static expanding agent synergistic anti-reflection system and method. Slurry prepared by mixing a static expanding agent and water is injected into the expansion fracturing drill hole, in the process that the static expanding agent is subjected to hydration reaction and generates expansion stress, carbon dioxide gas is injected into the expansion fracturing drill hole through the carbon dioxide gas injection pipe, carbon dioxide and the hydration product of the static expanding agent are subjected to carbonization reaction to generate larger expansion stress, and the expansion fracturing drill hole is formed. Expanding the coal body fractures to form expansion fractures; the carbon dioxide is driven by differential pressure to seep into a coal matrix along expansion fractures, and adsorbed gas is driven to be desorbed into a free state through a competitive adsorption effect; and under the combined action of extraction negative pressure and carbon dioxide displacement, the free-state gas moves from the fracture channel to the extraction drill hole, and extraction is conducted through the gas extraction system. Carbon dioxide and the static expanding agent cooperate to improve permeability of the coal body, the displacement effect of carbon dioxide on gas is promoted, and the gas extraction effect is improved.

The invention provides a micro-nano bubble-surfactant synergistic coal seam gas seepage displacement-dust fall method, which adopts a multi-stage gas and dust comprehensive prevention and control means, adopts a pressure pump and a pumping system in a liquid injection period, and controls the pressure and the pumping flow rate, so that the gas seepage displacement and dust fall of a coal seam are realized. A micro-nano bubble-surface active liquid coupling medium is adopted for conducting seepage displacement on coal seam gas, and it is ensured that the coal seam gas is efficiently discharged or extracted. After liquid injection is finished, the micro-nano bubble-surface active liquid coupling medium is stored in the coal seam, dust falling is conducted on the coal seam, reverse wetting of the coal seam is achieved, the water content is increased, and therefore dust is reduced, and the safety of coal mining is improved.

The utility model relates to a hole collapse prevention device in a coal seam gas extraction drill hole, which belongs to the technical field of coal seam gas extraction and comprises a central column positioned at the center, and a hole is formed in the central column along the height direction; and an abutting mechanism for resisting the pressure of the coal body and a control mechanism are arranged outside the central column. The multiple abutting mechanisms are arranged on the periphery of the center column and distributed in a circumferential array mode. Each abutting mechanism comprises a connecting plate, and the connecting plates are parallel to the central axis of the central column. And two groups of abutting assemblies which are symmetrically arranged up and down are arranged between the connecting plate and the central column. An irreversible elastic piece is fixedly installed between the center column and the connecting plate, so that the movable plate and the inner wall of the drill hole are confronted, and therefore the drill hole is prevented from collapsing. The abutting mechanism and the control mechanism comprise a plurality of springs, the counterforce is improved, and therefore the hole collapse prevention effect is improved.

The invention belongs to the technical field of coal mine safety mining, and relates to a microwave-hydraulic power combined permeability-increasing pressure relief and gas extraction method, which comprises the following steps of: firstly, carrying out geological survey and coal sample test to obtain physical and mechanical parameters of a coal seam; calculating the fracture pressure of the coal seam according to the parameters and determining hydraulic fracturing and microwave irradiation parameters; a hydraulic fracturing drill hole and a microwave irradiation drill hole are constructed; fracturing, irradiation and monitoring equipment is installed; performing low-frequency microwave preheating on the coal seam, and then performing staged hydraulic fracturing; the fracturing effect is evaluated through micro-seismic monitoring, and a weak area is marked; and finally, high-frequency microwave enhanced irradiation is carried out in the weak area, and meanwhile gas extraction is carried out. According to the method, through the synergistic effect of microwave thermal cracking and hydraulic fracturing, the coal seam permeability and the gas desorption efficiency are remarkably improved, meanwhile, the rock burst risk is reduced, safe and efficient gas extraction is achieved, and a reliable technical scheme is provided for high-gas coal seam mining.

The invention discloses an underground long-distance high-pressure pump set directional long drilling hydraulic fracturing method which comprises the following steps: S1, mounting a high-pressure pump set in an underground central water sump, and debugging; s2, a route is laid, and a three-way ball valve is installed; s3, a directional fracturing drill hole is designed and constructed, and a channel is provided for fracturing operation; s4, a fracturing tool is selected and installed in the drill hole, and a high-pressure pipeline is connected; s5, staged fracturing is conducted on the drilled hole, and fracturing parameters are monitored in real time; s6, monitoring data in the fracturing process are collected, the fracturing effect is evaluated, whether the expected target is reached or not is judged, and re-fracturing is conducted if the expected target is not reached; and S7, after fracturing operation is completed, the high-pressure pipeline is recycled, equipment maintenance is conducted, and it is ensured that the equipment is intact and free of damage for subsequent use. The high-pressure pump set is arranged in the central water sump, long-distance liquid supply is achieved through accumulated water in the water sump, the problem of insufficient liquid amount is solved, the fracturing efficiency is improved, and the fracturing effect is ensured.

The invention relates to the technical field of mine gas treatment equipment, in particular to an efficient gas extraction process based on a non-solidified hole sealing material and an extraction recovery device. The specific extraction process comprises the steps that the supporting device is placed in the plugging section, the extraction pipe is placed in through a hole pipe in the supporting device, the two plugging water bags are placed in front of and behind the supporting device, and the water bags expand to form sealing after water injection; non-solidified grout is injected into the plugging section through a grouting pipe by means of a grouting system; after extraction is completed, a slurry discharging system discharges and collects slurry of a plugging section, then water in plugging bags on the two sides is discharged, a water injection pipe, the two plugging water bags, a slurry injection pipe and a gas extraction pipe are taken out, a hook rod is controlled to penetrate through a hook hole of a supporting rod in the middle of the supporting device, and the supporting device is taken out and can be repeatedly used; the process is easy and convenient to operate, dynamic plugging of the non-solidified hole sealing material can be achieved, drilling supporting and related equipment and resource recycling can be achieved, the hole sealing and extraction effects are improved, and cost is effectively reduced.

The invention discloses a mining gas extraction conveying device which comprises at least one protective sleeve used for conveying gas, an extraction pump used for extracting gas and a conveying pipe located in the protective sleeve, and the protective sleeves are fixedly connected through a fixing sleeve in an airtight embedded mode. A first butt joint sleeve in airtight connection with the conveying pipe is fixedly installed in the middle of the fixing sleeve. The inner wall of the protective sleeve is coated with the manganese dioxide coating, ozone is filled in cooperation with the one-way gas pipe, when gas leaks to the protective sleeve in the conveying pipe, the ozone generates hydroxyl free radicals under catalysis of manganese dioxide, the hydroxyl free radicals and methane are subjected to an oxidation reaction, and the hydroxyl free radicals are decomposed into carbon dioxide and water, so that the explosion risk is reduced while the gas concentration is reduced; leaked gas is actively treated by utilizing a chemical catalysis principle, decomposition can be carried out when the gas leaks, the safety of the device is effectively improved, meanwhile, generated water prompts the leakage position through a dyeing patch of a drainage pipe, and timely maintenance is facilitated.

The invention relates to the technical field of gas extraction devices, and discloses a coal mine underground gas extraction auxiliary supporting device which comprises a gas extraction drilling machine. The drill rod comprises an outer rod body and an inner rod body; the auxiliary supporting mechanism comprises a plurality of sets of expansion closed bins, expansion assemblies are arranged in the expansion closed bins, and thrust is provided for the exterior of the drill rod through the expansion assemblies; the pore channel supporting sleeve is arranged on the outer rod body; the expansion assembly is used for expanding the pore channel supporting sleeve outwards so as to support the inner wall of the pore channel through the pore channel supporting sleeve and prevent the interior of the pore channel from collapsing. The expansion assembly is controlled to work, so that the expansion assembly provides thrust to the outside of the drill rod, the hole channel supporting sleeve is driven to expand outwards, the inner wall of the hole channel is supported, and the problem that after the drill rod is pulled out of a drill hole, the supporting effect originally provided by the drill rod disappears, and the hole collapse phenomenon occurs in the drill hole is effectively solved. And the coal body can be deformed due to stress change.

The invention discloses an intelligent and accurate regulation and control multi-method collaborative fracturing intensified gas extraction method and system, and the method achieves the dynamic and accurate adjustment of parameters such as borehole arrangement, hydraulic fracturing strength and ultrasonic frequency through an intelligent regulation and control algorithm based on monitoring geological parameter feedback and a parameter self-adaptive adjustment technology. The optimal gas extraction scheme can be implemented according to different coal seam geological conditions, and the accuracy and efficiency of gas extraction are remarkably improved. The coal seam anti-reflection method is simple in construction process and easy and convenient to operate, the defects of a single anti-reflection technology can be effectively overcome, the advantages and disadvantages of anti-reflection measures are complementary, the coal seam anti-reflection effect is effectively improved, efficient mining and utilization of gas resources are achieved, safe and efficient production of a mine is powerfully guaranteed, and remarkable economic benefits and social benefits are achieved.

The invention provides a short-distance coal seam group Y-shaped ventilation gas extraction method, which belongs to the technical field of coal mining, and comprises the following steps: firstly, arranging a main drill hole vertical to a coal seam and branch drill holes extending to upstream and downstream at an angle of 45 degrees to form a Y-shaped three-dimensional extraction network; installing a gas concentration monitoring sensor network, and setting monitoring points to collect real-time data; constructing a gas concentration adjusting buffer system and an intelligent mixed gas distribution device, and maintaining the concentration of extracted gas to be 30-45%; establishing a predictive control model based on a long short-term memory neural network, predicting a gas emission rule in advance and dynamically adjusting extraction parameters; a gas concentration grading utilization system is implemented, and gas with different concentrations is guided into the corresponding utilization system; a gas extraction intelligent monitoring platform is deployed to realize remote monitoring and fault early warning; the technical problems that in the coal seam group gas extraction process, the extraction concentration is unstable, and prediction control is difficult are solved.