128results about How to "Increase extraction concentration" patented technology

The invention discloses a method for performing through-going seam cutting, pressure relief, permeability enhancement and quick tunneling on a soft and high-outburst coal seam, and in particular is applied to quick tunneling in a coal seam which is high in outburst danger and a laneway is difficult to support in a coal mine. The method comprises the following steps of: forming a network type fractured net by high-pressure jet flow seam cutting, pressure relief and permeability enhancement technologies, and enhancing an effect of extracting strip-type coal seam gas on a coal laneway subjected to through-going drilling and pre-extraction; and forming a network type filling region by pressing and injecting filling materials, so that the strength and stress distribution of a coal body are improved, the coal laneway is easy to maintain in the tunneling process, a phenomenon that the gas rushes out of a tunneled laneway is avoided, gas accidents are eliminated in the tunneling process, and an aim of safely and quickly tunneling the laneway is fulfilled.

A gas extraction and drilling cooperative drilling and protecting integrated system for soft coal seams and process belong to soft coal seam cooperative drilling and protecting systems and process. The gas extraction and drilling cooperative drilling and protecting integrated system mainly consists of a control table, a hydraulic pump station, an air compressor, a feeding device, a drill stem, a hole protecting tube, a drill bit and the like. The hole protecting tube is located in the drill stem, and the hole protecting tube and the drill stem are synchronously connected and drill cooperatively. The depth of a drilled hole is equal to the length of the hole protecting tube. Finally, the hole protecting tube penetrates through the drill bit, and the drill stem is withdrawn while the hole protecting tube is remained in the hole to realize functions of supporting a hole wall and extracting gas. The system and the process are convenient in operation, the hole protecting tube and the drill stem realize cooperative drilling and protecting, the hole protecting tube is easy to be remained in the drilled hole, problems that the hole collapses and the hole protecting tube is difficult to be fed to the drilled hole can be resolved, the hole protecting depth is high, the hole wall can be supported more effectively, deformation and collapse are prevented, accordingly high gas extraction concentration and flow of the soft coal seams are guaranteed, and the gas extraction and drilling cooperative drilling and protecting integrated system for soft coal seams and the process are particularly applicable to quite soft coal seams with the value of the firmness factor f smaller than 0,3.

The invention discloses a method for extracting coal bed gas from circulating pulse type low temperature freeze-thawed anti-reflection coal. Firstly, a borehole and multiple rows of guiding slots are constructed in a coal bed, the guiding slots are communicated with the borehole and extend to two sides of the borehole in the direction perpendicular to the borehole in the coal bed, and coal bed gas extraction boreholes are formed at the outer ends of the guiding slots. A liquid low-temperature medium is injected into the borehole and the guiding slots in a high-pressure pulse mode, the coal bed is freeze-thawed by adopting a pulse circulating low temperature freeze-thawing method to fracture for increasing reflection, and a coal bed gas extraction fracture network is thus formed. Coal bed gas is extracted via the coal bed gas extraction boreholes. By combining freeze-thawing erosion with coal bed gas extraction and combining pulse circulating injection of the liquid low-temperature medium with freeze-thawing phase change fracture, the method significantly improves the anti-reflection efficiency of coal. The method is simple, feasible and low in construction cost, can effectively improve the single-pore extraction quantity and extraction concentration of coal bed gas and prolong the attenuation time of gas concentration, and is particularly suitable for coal bed gas extraction in low-osmosis and high-gas bearing coal beds.

The invention provides a powder particle-high-pressure grouting crack packing gas extraction drilling and sealing device and method. The powder particle-high-pressure grouting crack packing gas extraction drilling and sealing device and method is applicable to underground coal mines. The powder particle-high-pressure grouting crack packing gas extraction drilling and sealing device comprises an outer bag and an inner bag, wherein the rear of the outer bag is provided with a fixing unit on a gas extraction pipe; the inner bag is provided with a screen pipe, a bag grouting pipe and a grouting pipe which penetrate through the fixing unit, the tail portions of the screen pipe, the bag grouting pipe and the grouting pipe are arranged at the rear of the outer bag, and the tail ends of the screenpipe, the bag grouting pipe and the grouting pipe are provided with valves; quick lime powder coerced by carbon dioxide is guided into the space among packing materials via the screen pipe to block fractures around a drilled hole through reaction products; cement mortar is filled in by the grouting pipe to achieve the aim of packing cracks and actively supporting the drilled hole. Therefore, thepowder particle-high-pressure grouting crack packing gas extraction drilling and sealing device can effectively reduce the influence of mining damage, prolong the effectively extraction period of drilling gas extraction, increase the concentration of extracted gas, maintain stability of the drilled hole, significantly improve the coal seam gas extracting effects and ensure safety of underground workers.

A mining-coal bed nearly horizontal gas extraction borehole sealing method is mainly suitable for gas extraction boreholes at sites like coal faces in underground coal mines and coal roadways. The sealing method mainly includes two parts: static sealing and dynamic sealing. For a gas extraction borehole, static sealing is performed firstly and includes two times of grouting: for the first grouting, expansion cement grout is adopted to seal positions outside a fissure zone, and for the second grouting, slurry is adopted to seal positions inside the fissure zone; after a period of time, dynamic sealing is performed and includes that the expansion cement grout and the slurry are constantly grouted into the borehole by utilizing underground compressed air to enable the borehole and surrounding fractures to be always filled with the expansion cement grout and the slurry so as to realize dynamic sealing. By the method, grouting fluid can be enabled to effectively seal space inside the borehole and coal fracture areas surrounding the borehole in real time, and maximization of space and fracture sealing is realized. The mining-coal bed nearly horizontal gas extraction borehole sealing method is simple in structure, convenient to operate, low in cost and evident in effect.

The invention relates to a coal and gas co-mining method based on a mining fissure elliptic paraboloid zone; the spatial-temporal evolution and the distribution characteristics of the fissure elliptic paraboloid zone which is formed by coating a rock stratum when a working face is propelled during coal bed mining are analyzed through a physically similar material simulation experiment and numerical simulation calculation, the height h1 of an inner elliptic paraboloid surface, the height h2 of an outer elliptic paraboloid surface, incisions and relevant parameters of the working face, an intake airway and a return airway are obtained, and the mathematical formula of the elliptic paraboloid zone is deduced. The results of the physically similar material simulation experiment and a numerical simulation experiment are input into the mathematical formula of the elliptic paraboloid zone, so that the destination of a gas extraction drilled hole and the height of a gas extraction roadway can be determined conveniently. Spot effect inspection proves that putting the destination of the gas extraction drilled hole and a gas extraction roadway into the fissure elliptic paraboloid zone can greatly improve the extraction concentration of gas, so that the coal mining on the working face and continuous extraction of pressure-relieved gas can be promoted synchronously, and a coal and gas co-mining mechanism in high-gas coal bed mining is worked out.

The invention relates to a gas extraction method for parallel hole arrangement of an L-shaped drilling and fracturing weakening top plate. The gas extraction method comprises the following steps: firstly, determining drilling positions and selecting drilling parameters on the ground corresponding to a working face of a coal mining seam; secondly, performing L-shaped fracturing drilling and L-shaped gas extraction drilling construction; thirdly, after the L-shaped fracturing drilling construction is finished, arranging a casing pipe and fracturing equipment in an L-shaped drilling hole; fourthly, after the L-shaped gas extraction drilling construction is finished, arranging a gas extraction pipe with air holes in L-shaped gas extraction drilling hole; fifthly, performing fracturing in advance on a coal seam top plate by using a hydraulic jet staged fracturing method; sixthly, extracting fissure zone gas by the gas extraction pipe while performing coal mining operation. According to the scheme, the problems of high mine pressure behavior and transfinite fissure zone gas in a goaf in a coal mining process in the prior art are solved.

The invention relates to a whole black liquor large liquor rate cercal grass cooking technology with digester, comprising the following steps: after stocking, preimpregnating the grass raw fiber; loading the preimpregnated raw material into cooking equipment to perform first stage boiling washing to discharge black liqucd of high concentration to obtain straw pulp intermediate product; supplying cooking liquor to the said cooking equipment, and second stage boiling washing the straw pulp intermediate product, and then straw pulp being obtained through washing; repective cycle operating ryegrass large liquor rate displacement cooking and ryegrass large liquor rate displacement cooking black liquor and implementing grading displacement cooking in cooking pan, the research and design of cooking pan grading displacement cooking technology and the corresponding device design and parttern selection being done. The said technology can be used in rebuilting the domestic ryegrass pulp mill. The pulp strength can be enhanced and the quality of the waste liquor is improved. The invention benifits for recovery processing and reduces the discharge of the waste liquor and BOD, COD.

Provided is a gas-liquid-solid three-phase coupling blasting weakening rock burst and permeability increasing method. By coal seam water injection and changing of a powder charge structure of traditional blasting, common gas-solid two-phase blasting is converted into gas-liquid-solid three-phase blasting. Blast wave in water, jet flow, secondary pressure wave and other effects are generated by water pressure blasting to enhance blasting effect, after drilled holes are formed, coal bodies are wetted through water injection firstly, physical and mechanical properties around the drilled holes are changed, the gas-solid two-phase coal bodies are converted into gas-liquid-solid three-phase media, a stress concentrating zone is pushed to the deep parts of the coal bodies, stress concentration is lowered; coal seam fractures around blasting holes and in an influence zone are stretched and developed, the fractures are communicated with each other, a facture network is formed, stress concentration is removed, channels are provided for coal seam pressure relief gas flow, and accordingly the purpose that rock burst and gas outburst are prevented is achieved.

The invention discloses a coal mine gas extraction system and method for increasing the concentration of gas extraction by reducing and pore broadening. The coal mine gas extraction system comprises acoal mine drilling machine, a drill hole drill bit, a hole sealing mechanism, a grouting piping system, a gas extraction piping system and a reamer bit. The reamer bit comprises a power transmissionmechanism and three bit fins. The power transmission mechanism comprises a sun gear and three planetary gears, the sun gear is fixedly connected to a sun gear rotating shaft, the planetary gears are rotatably connected to a planetary gear rotating shaft, the three bit fins are separately and fixedly connected to the three planetary gears, and the bit fins are connected with cutting teeth through tooth bases. A hydraulic cylinder and an ejection rod are arranged in the sun gear rotating shaft, a spiral sliding groove is formed in the ejection rod, and a sliding block is arranged on the inner wall of the sun gear rotating shaft. The method comprises the steps that 1, hole drilling is performed; 2, pore broadening is performed; 3, hole flushing is performed; 4, grouting and hole sealing are performed; and 5, gas extraction is performed. The coal mine gas extraction system and method for increasing the concentration of gas extraction by reducing and pore broadening has novel and reasonabledesign, high strength of a reamer bit and simple reaming process, can improve hole sealing quality and the concentration of gas extraction, and is practical and effective and easy to popularize.

This is a gas extraction method via a long vertical pipe at goaf zone. Two holes are made on the top and bottom board of the air gallery at the working face. Sectional metal pipes are linked together to form a long vertical pipe, with the top sealed and inserted into the hole on the top board, and the bottom inserted into the bottom board and concreted. Small holes distributes on the pipe wall and been wrapped with pack. The pipe is connected to the extraction network. With 5m of the pipe getting into the goaf zone, start extraction; with the previous pipe getting into the goaf zone at 30m, and the following one at 5m, shut the previous pipe and open the following one. So realize a continuous extraction and decrease the gas concentration at the solid angle. The gas concentration could be controlled under 0.6%.

The invention discloses a flame-retardant low-heat-release type gas extraction drilled hole plugging material, which comprises a component A and a component B, wherein the component A comprises the following raw materials in parts by mass: 45 to 75 parts of polyether polyol 1, 5 to 15 parts of polyether polyol 2, 15 to 30 parts of mannich polyols, 1 to 5 parts of polyester polyol, 0.01 to 3.0 parts of catalyst, 1.5 to 3.0 parts of foam stabilizer, 1.0 to 6.0 parts of foaming agent, 10 to 30 parts of flame retardant and 0.5 to 1.5 parts of stabilizer; the component B is multi-methylene multi-phenyl polyisocyanates; and the mass proportion of the component A to the component B is 100:(100-200). The plugging material can meet a requirement of the conventional hole plugging construction process; and the prepared plugging material has the characteristics of low reaction release heat, small water foaming rate, high flame retardant, high mechanical property and the like.

The invention discloses an extraction pipe, an extraction system and a downwards-drilling extraction method. The extraction pipe comprises a wall protection sleeve and a ventilation pipe, wherein the wall protection sleeve and the ventilation are abreast and fixedly arranged, a first opening is arranged on the lateral wall of one end of the ventilation pipe, a second opening is arranged on the wall protection sleeve at the corresponding position, and the first opening and the second opening are communicated. The ventilation pipe and the wall protection pipe of the extraction pipe are communicated through the first opening, and other portions of the ventilation and the wall protection sleeve are not communicated. In an extraction process, the ventilation pipe and the wall protection sleeve form a communicating vessel, so that deposited water in the wall protection sleeve can be extracted easily. After water is extracted, gas in coal seams can enter the wall protection sleeve via through holes on the wall protection pipe. Thus, gas extraction concentration is improved.

The invention discloses a formula of a honey refined gum for treating chloasma and a preparation method thereof. The medicinal composition comprises the following crude medicaments in part by weight: 50 to 60 parts of sealwort, 30 to 40 parts of Chinese wolfberry, 10 to 20 parts of donkey-hide gelatin, 5 to 8 parts of cinnamon, 10 to 15 parts of peach blossom, 10 to 15 parts of flower of puncturevine caltrop, 10 to 15 parts of Anhui chrysanthemum flower, 10 to 15 parts of honey suckle, 10 to 15 parts of rose, 10 to 15 parts of dandelion, 10 to 15 parts of gardenia, 20 to 25 parts of mulberry, 15 to 20 parts of dahurian angelica root, 15 to 20 parts of white almond, 20 to 30 parts of white poria, 20 to 30 parts of Chinese yam rhizome, 20 to 30 parts of lily, 10 to 15 parts of dried tangerine peel, 15 to 20 parts of papaya, 15 to 20 parts of citron peel, 10 to 15 parts of folium mori, 15 to 20 parts of peach kernel, 15 to 20 parts of bunge cherry seed and 15 to 20 parts of spina date seed. The honey refined gum has the characteristics of conditioning Yin and Yang, benefiting the spleen and kidney, soothing the liver and regulating Qi, clearing heat and releasing toxin, and invigorating the circulation of blood and relaxing the bowels, can effectively regulate the female endocrine, and has good treatment effect on the chloasma, blackish facial patch, baldness, white hair, insomnia, anxiety and constipation.

The invention discloses a gas extracting drilling solid-liquid two-phase hole sealing device. The gas extracting drilling solid-liquid two-phase hole sealing device comprises a first capsule bag, a second capsule bag, a third capsule bag, a primary grouting pipe and a secondary grouting pipe, a first hole sealing section is arranged between the first capsule bag and the second capsule bag, and a second hole sealing section is arranged between the second capsule bag and the third capsule bag; and an explosive valve located in the first hole sealing section is formed in the primary grouting pipe, the other end of the secondary grouting pipe is located in the second hole sealing section, and is in communication with the second hole sealing section through a second one-way valve. The inventiondiscloses a gas extracting drilling solid-liquid two-phase hole sealing technology at the same time, a network is connected to perform extracting after the first hole sealing section is subjected tosolid-phase hole sealing, periodic detection of gas extracting concentration is carried out to an extracting drilling hole of which the solid-phase extracting is completed, liquid-phase sealing of thesecond hole sealing section is perform on an extracting drilling hole with gas leakage, and then extracting can be continued. According to the gas extracting drilling solid-liquid two-phase hole sealing device and technology, liquid-phase hole sealing operation can be carried out to an extracting drilling hole with poor hole sealing and the gas leakage, periodic maintenance can be carried out tothe liquid sealing effect, and extracting drilling hole is prevented from densified cumbersome construction.

The invention discloses a method for injecting high-temperature nitrogen gas for improving coal body permeability after liquid nitrogen gasification circulation. A gas extraction drill hole is constructed inside a working face roadway; magnetic water is injected into the gas extraction drill hole through a magnetic water injection pipe, and then the magnetic water permeates into a coal body around the gas extraction drill hole; the gas extraction drill hole is filled with liquid nitrogen inside a liquid nitrogen tank; the liquid nitrogen is frozen to permeate into the magnetic water inside the coal body and gasified into nitrogen gas, and the pressure inside the gas extraction hole is increased; the gasified nitrogen gas inside the gas extraction drill hole enters a nitrogen gas heating tank to be collected; the step of freeze thawing is repeatedly executed, and repeated liquid nitrogen gasification circulation is implemented on the gas extraction drill hole; the nitrogen gas collected inside the nitrogen gas heating tank is heated, high temperature nitrogen gas is injected into the gas extraction drill hole, and the coal body is subjected to fracturing through the high temperature nitrogen gas. The coal body is made to generate a weakening region, and then the coal body is subjected to fracturing and permeability improvement, so that the heat storage time of nitrogen gas is shortened, and meanwhile the coal body permeability improvement range is enlarged.

The invention relates to a gas extraction method for L-shaped borehole staged fracturing of a weakened coal seam roof, which comprises the following steps: 1) selecting the drilling position and parameters at the ground position corresponding to the working face of the coal seam to be mined, and constructing L 2) After the construction of the L-shaped borehole is completed, casings and fracturing equipment are arranged in the L-shaped borehole, and each preset fracturing site of the coal seam roof is fractured by means of hydraulic jet staged fracturing, to weaken the roof of the coal seam; 3) After the fracturing operation is completed, remove the fracturing equipment and connect the casing in the L-shaped borehole to the gas drainage device; 4) Start the coal mining operation at the coal mining face, and While the coal face is moving forward, the gas in the fracture zone is extracted through the gas extraction device. This solution solves the problems in the prior art that the amount of gas extraction is limited and the extraction intensity is not enough, and the coal seam gas cannot be extracted and utilized to a great extent.

The invention discloses an Ion Proton-based TM Blood cell-free DNA library construction method, reagents and applications of the sequencing platform, the construction process includes blood cell-free DNA extraction, end repair, fragment selection, adapter ligation, magnetic bead purification, library amplification, library detection, high-throughput sequencing and other steps . The present invention also provides a kind of for constructing based on Ion Proton TM Blood cell-free DNA extraction reagents, end repair reagents, linker ligation reaction reagents, and amplification reagents for the blood cell-free DNA library of the sequencing platform. The invention significantly improves the extraction concentration of fetal free DNA in pregnant women's plasma, and has simple steps and low cost, and improves the success rate of library construction; the optimized library construction system is more convenient for operation and saves costs, and after replacing the magnetic beads, it can be purified and recovered Higher efficiency; library amplification does not require sufficient sample size and secondary detection, and the operation is simpler. The method of the invention is more suitable for non-invasive prenatal diagnosis of fetal chromosomal aneuploidy.

The invention discloses an underground dark mining drilling well gas extraction method, comprising the following steps: firstly constructing a gas extraction lane in a hard rock layer below an upper-group coal seam worked out area or above an unmined coal seam of the vertical distance of a firstly mined coal seam; carrying out middle construction on the gas extraction lane along the pushing direction of the firstly mined working face; starting the construction from a dark mining well of an open-off cut side and the part of the open-off cut in the gas extraction lane after construction; constructing the dark mining well the bottom of which is vertical to the top plate of the firstly mined working face at intervals; arranging an extraction pipe connected with the gas extraction pipeline; and connecting the extraction pipelines in the dark mining well into a mine gas extraction system through the gas extraction pipeline for gas predraining before mining, gas extraction in mining and gas extraction after mining. The method has the advantages of a ground drilling well extraction coal seam group, namely large extraction amount, high extraction concentration and good extraction effect, is good in stability and small in work amount, has low possibility to break and is easy to drain.

The invention discloses a device and a method for active hole drilling and sealing. The device comprises a gas extraction pipe, a grout injection pipe, a grout return pipe, an inner-block grout disk, an outer-block grout disk, a sealing piston, a gravity hammer and a grout storage tank, wherein the bottom of the grout storage tank is provided with a grout injection opening which is controlled by a grout injection valve and a grout supplementing opening which is controlled by a grout supplementing valve. An inorganic flexible paste body is injected into a drilling space between the inner-block grout disk and the outer-block grout disk through the grout injection pipe, the grout return pipe is connected with the grout storage tank when the grout return pipe is subjected to grout return, the grout injection valve can be opened, the inorganic flexible paste body can be squeezed out by applying sustained pressure to the inorganic flexible paste body in the grout storage tank by the gravity hammer, cracks added around a drilling hole can be sealed and blocked, and the active hole drilling and sealing of the drilling hole can be realized. The device and the method, which are disclosed by the invention, have the advantages that the structure is simple, the operation is convenient, the cost is low, and the using effect is good.

The invention discloses a drilling device for underground gas holes and a drilling method thereof. Firstly, sleeve holes are drilled in a drainage area; hole sealing sleeves are fixedly sealed in orifices; then, the hole sealing sleeves are connected with drilling devices; during drilling, the internals of drilled holes are pressurized through hollow drill rods and filled with cooling liquid to achieve a hole wall supporting effect; after holes are drilled through rock layer sections, wall protecting mud is injected in rock layers in a pressurized mode, and a certain static water pressure is formed in the holes to achieve a rock wall stabilizing effect; clear water is used for drilling after entering coal seams; water and slag generated in the drilling process are separated by a water-slagseparation device to realize secondary utilization of resources; after final holes are drilled in, drainage pipelines are replaced in the holes in a pressurized state for flow pressure-reduced drainage; and through the flow pressure-reduced drainage method, the problem of blockage of hole wall gaps by the speed-sensitivity effect can be prevented, the gas quantity attenuation efficiency of the gas holes is reduced, and the gas extracting quantity is increased.

The invention belongs to the technical field of coal mine safety, and particularly relates to a coal seam air injection expansion secondary permeability improvement method adopted after liquid CO2 blasting and used for promoting gas extraction. According to the method, blastholes and gas extraction holes are formed in a work face at the same time and formed at equal intervals, and liquid CO2 blasters are mounted in the blastholes to conduct liquid CO2 blasting; then, gas extraction pipes are laid in the gas extraction holes, the gas extraction holes are sealed, air of a coal mine down-hole compressed air system serves as an air source of air injection, coal seam air injection expansion secondary permeability improvement is conducted, the air injection air source is connected into the blastholes, the blastholes are sealed, an air injection and gas extraction system is started, and gas extraction is conducted. By the adoption of the method, gas extraction scalar quantity is greatly increased, and huge economical and social benefits are achieved; meanwhile, the technical process is simple, and the method has very good application and popularization prospects.

The invention relates to a gas extraction method based on a mining-induced fracture circular rectangular half-space zone. By analyzing dynamic evolution characteristics, a mechanical mechanism and influence factors of the mining-induced fracture zone, the open-off cut side bandwidth is obtained and is about a first weighting interval, the working face side bandwidth changes within 2-3 times of a periodic weighting interval, the bandwidth near a wind inlet lane and the bandwidth near a wind return lane are about the 0.7-0.8 time of the first weighting interval, the height of an inner half-space face and the height of an outer half-space face are controlled by a key stratum position and the deformation, fracture and instability states of a formed masonry beam structure, accordingly, arrangement parameters of end points of mining-induced pressure relief gas extraction drill holes are determined, the field effect test shows that as the gas extraction drill holes are formed in the mining-induced fracture circular rectangular half-space zone, the gas extraction concentration is improved greatly, synchronized advancement of coal mining on a working face and continuous pressure relief gas extraction is achieved, the mechanism of mining coal and gas together at a high-gas coal seam is obtained, and the gas extraction method based on the mining-induced fracture circular rectangular half-space zone is formed.

The invention discloses a method for improving a drilling drainage concentration of gas in broken coal bodies. According to the method, firstly, a drill rod with small diameter is used for opening toreduce coal body breaking, then liquid gel is used for making the broken coal bodies around a drill hole condensed into one, then a drill rod with large diameter is used for reaming, in the way, cracks around the drill hole are greatly reduced, and a foundation is laid for subsequent effective hole sealing; after hole sealing is conducted, certain pressure is used for injecting semifluid into a sealed space formed in a sealed hole segment, moreover, injected hole sealing slurry is always in a relatively constant-pressure state, therefore, once newly-developed cracks appear around the drill hole, the semifluid slurry can permeate automatically, the cracks are automatically filled, air leakage channels are isolated, and inlet air is reduced, so that the gas drainage concentration is improved.

The invention relates to a system and process for coal seam permeability improvement by inducing hole drilling extraction later-period gas burning explosion. The left end of a connecting pipe (2) is connected with a first gas extraction pipe (1); the right end of the connecting pipe is connected with a sealed gas extraction drilling hole (17); a third electromagnetic valve (8) is arranged on a water conveying pipe (10); a water discharging pipe (13) is arranged on a pipeline for connecting the third electromagnetic valve and the connecting pipe; a fourth electromagnetic valve (9) is arranged on the water discharging pipe; a first electromagnetic valve, a second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve, a temperature sensor, a methane sensor and a carbon monoxide sensor are connected with an intelligent controller (12) through connecting wires (11); and an electric spark igniter (14) is connected with an external power supply switch through a conducting wire. The system has the advantages that the operation is simple; the real-time monitoring can be realized; the manual coal seam burning explosion permeability improvement induction is realized; the gas permeability of a coal seam can be improved in a short time; and the problems of high-gas low-permeability coal seam gas extraction difficulty and fast extraction concentration reduction are solved.

The invention discloses a hole drilling and sealing device and method with continuous belt pressure. The device comprises a gas extraction pipe, a grouting pipe, a grout return pipe, grout blocking plates, a grout storing tank, a grout pressing plate and a spring, wherein the grout blocking plates are connected to the gas extraction pipe at equal intervals of 10m to enable the gas extraction pipe to be fed into a dill hole, and the outer grout blocking plate is made to be in the drill hole and in the position away from the opening of the drill hole for 1m. Inorganic flexible pasty fluid is injected to the drill hole space between every two grout blocking plates through the grouting pipe; when the grout return pipe performs grout returning, the grout return pipe and a grout supplementing valve on the lower portion of the grout storing tank are connected, an air receiving valve is opened, and continuous air pressure is applied to the inorganic flexible pasty fluid in the grout storing tank; when fractures around the drill hole increase, the inorganic flexible pasty fluid is continuously pressed into the fractures around the drill hole by the air pressure in the well. When the inorganic flexible pasty fluid in the grout storing tank is totally pressed into the drill hole, a pressure relief valve is opened, and a grout pressing plate ascends under the action of the spring. Due to the fact that the inorganic flexible pasty fluid is injected into the grout storing tank again through a grouting valve, the drill hole is effectively sealed through the continuous belt pressure.

The invention discloses a drill hole inside secondary grouting leaking stoppage device. The drill hole inside secondary grouting leaking stoppage device comprises an injection pipe composed of a plurality of single-section pipes which are connected in sequence, all the single-section pipes comprise gas injection pipes and grouting pipes, the grouting pipes are arranged inside the gas injection pipes in a sleeved manner, wherein the grouting pipes are connected with the grouting pipes, the gas injection pipes are connected with the gas injection pipes, the inner ends of the multiple mutually-connected gas injection pipes stretch out of the inner end of a gas extraction pipe, get over a fracture zone of a drill hole and are connected with and communicate with an inner end gasbag, the parts,located at the inner end of the gas extraction pipe, of the multiple mutually-connected gas injection pipes are connected with and communicate with an outer end gasbag, the gas extraction pipe and oneend of an inlet of the drill hole are further provided with a sealing body, the ends, located at the drill hole inlet, of the multiple gas injection pipes of the injection pipe are connected with gassupply equipment, and the ends, located at the drill hole inlet, of the multiple grouting pipes of the injection pipe are connected with grouting equipment. By means of the drill hole inside secondary grouting leaking stoppage device, precision grouting with pressure can be performed on the failure drill hole fracture development position, so that the gas extraction failure drill hole extractionfunction is activated and restored, and the gas extraction concentration and purity are increased.

The invention discloses a gas extraction downward hole sealing device and further discloses a hole sealing method based on the gas extraction downward hole sealing device. The gas extraction downwardhole sealing device comprises a two-way bundle tube, wherein the two ways of bundle tube bodies serve as an extraction tube and a drainage tube correspondingly. The two-way bundle tube is put downwards to a coal seam floor at the hole bottom, and holes are formed in the part, put downwards to the area between coal seam floor and the hole bottom section, of the two-way bundle tube; the two-way bundle tube is sleeved with a hole-sealing pocket, the hole-sealing pocket is arranged at the in-hole base bottom and used for sealing a drilled hole; and a slurry-injection tube is further arranged on the hole-sealing pocket, inserted into the hole-sealing pocket along the drilled hole and used for injecting slurry into the hole-sealing pocket and the drilled hole. The gas extraction downward hole sealing device has the advantages that the influence of joint air leakage on the extraction effect is avoided, the occupied space of a sleeve in the hole is reduced, the hole-sealing quality is improved, and the extraction concentration is increased by six times or above; and hole-sealing materials are simple, and the single hole cost is relatively saved by 50%.

Disclosed is a bedding drill hole air-leakage-preventing gas extraction method. The bedding drill hole air-leakage-preventing gas extraction method comprises two stages of building of a main gas extraction system and building of an auxiliary gas extraction system, specifically, firstly, a main gas extraction pipeline is laid inside a roadway, bedding extraction drill holes are constructed, the bedding extraction drill holes are sealed, and drill hole gas extraction pipes are connected to the main gas extraction pipeline to conduct gas extraction; and after the drill holes in the roadway are all sealed to conduct extraction, an airtight wall is constructed at an opening of the roadway where the drill holes are constructed, an auxiliary gas extraction pipeline is laid, and an auxiliary extraction pipe is connected with an auxiliary gas pump extraction pipeline to conduct auxiliary extraction. According to the bedding drill hole air-leakage-preventing gas extraction method, under the effect of the auxiliary extraction negative pressure, the atmospheric pressure in the roadway can be gradually reduced and finally reaches or approximates to the extraction negative pressure in the drillholes, and the problem that air leakage is serious in the bedding drill hole extraction process can be effectively solved; the technology is simple, implementation is easy, and a large amount of laborcost can be saved; and the bedding drill hole air-leakage-preventing gas extraction method is suitable for bedding drill hole gas extraction of various coal mines, and particularly suitable for mineswhere air leakage is serious in the extraction process.

The invention relates to a coal bed methane extraction method based on directional drilling and liquid nitrogen freezing heat cracking, and belongs to the technical field of methane treatment. An inclined drill hole is formed in the upper roadway of the extraction work face, and the inclined drilled hole is merged into an extraction pipe network to be subjected to methane extraction; after the work face methane extraction amount is attenuated, the inclined drill hole is detected, a drill hole with extraction failure is marked, meanwhile, a long-distance orientation drill hole is constructed ina retracement channel or air return main roadway of the extraction work face in the coal seam direction to serve as a liquid nitrogen injection hole, liquid nitrogen is injected into the long-distance orientation drill hole, through detection of the temperature in the drill hole marked as extraction failure, whether the drill hole is a liquid nitrogen influence hole or not is judged, if the holeis the liquid nitrogen influence hole, high-temperature air is injected into the drill hole, and the coal around the drill hole is cracked under the freezing heat condition, and the coal permeation characteristics are improved. The methane extraction amount is improved, the process is simple, and the work cost is low.