40results about How to "Solve the overrun problem" patented technology

The invention discloses a method for arranging roadways on a coal-pillar-free stope. Particularly, the method comprises the following steps: two roadways are arranged on each working face, one is an excavating roadway, and the other is a gob-side retained or excavated roadway on an upper working face; before a present working face is stopped, a roadway and a cut are excavated in advance on a supersedure working face adjacent to the present working face; the cut is connected with the excavating roadway of the present working face; and the excavating roadway and the cut of the supersedure working face serve as the boundary return airway of the present working face during gob-side roadway retaining, and serve as the construction pathway for the gob-side excavated roadway during gob-side entry driving. Therefore, through the adoption of the method, mining without coal pillars is achieved and a two-in and one-out Y+L type ventilation system is formed. In the method, the excavating roadway and the cut of the supersedure working face serve as the return airway of the present working face and one roadway of the supersedure working face, thereby achieving dual purposes and eliminating the excavating of a roadway; and a pressure peak area is avoided, so that more coal pillars can be extracted, the problem of transfinite methane gas is solved, the excavation tight relationship is relieved, and the method can be widely applied to coal mines, metallurgic mines and other industries.

The invention provides a coal mining method of fully-mechanized caving mining with large mining height in a super-high seam, a coal caving process, reasonable type of a support, production capacity of equipment, comprehensive control measures of coal wall spalling of working face, a technical route for improving the recovery rate of the fully-mechanized caving face with the large mining height, and feasibility evaluation indexes (thickness of the seam, top coal cavability, coal wall stability and roof pressure strength) of the fully-mechanized caving mining with the large mining height, and further forms a whole set of fully-mechanized caving mining process technology with the large mining height. The coal mining method is that the coal cutting height is 4.2-4.8m; the length of the working face is 200-280m; and the web of a coal mining machine is 0.8-1m. The process technology can increase the coal cutting quantity by 43%, shorten the coal caving time by 9%, relatively reduce the coal caving quantity by 9%, improve the resource recovery rate by 5% and reduce the mining-caving ratio to below 1:3 by increasing the coal cutting height, and can further realize the relatively balanced production of mining and caving of the working face.

The invention discloses a low-permeability soft coal seam extra-thin layer water jetting exploiting permeability increasing method. The method includes the following steps that 1 extra-thin layer water jetting exploiting parameters are designed; 2 extra-thin layer water jetting exploiting devices are machined, tested and installed; 3 a water jetting exploiting radius and a corresponding water jetting parameter are measured; 4 slag discharge holes and middle exploiting holes are constructed; 5 water jetting coal mining is started on an extra-thin layer; 6 when the coal mining reaches a designed location, the extra-thin layer water jetting exploiting devices are closed; 7 jetting exploiting drill holes and the slag discharge holes are linked to pumping-releasing pipelines to pump and release; 8 the steps ranging from 5 to 7 are repeated, and next drilling construction and jetting exploiting are conducted; 9 detection is conducted on a extra-thin layer exploiting pressure relief effect. By means of the method, the flow of coal seam hectometer hole drilling gas is increased by times, the pumping and releasing time of the gas is greatly shortened, the pumping and releasing radius is increased by times, the well drilling construction quantity is reduced, the gas overrunning probability is greatly reduced in the tunneling period and stoping period, and valuable time and safety guarantee are provided for the coal mine safety-efficient stoping and tunneling.

The invention discloses a coal mine gas extraction method. The coal mine gas extraction method comprises the following steps that a gas source is divided into a high concentration gas source and a lowconcentration gas source, the gas concentration in the high concentration gas source is larger than or equal to 25%, and the gas concentration in the low concentration gas source is less than 25%; ahigh concentration gas extraction system is used for extracting the high concentration gas source, and when the gas concentration is less than 25%, extraction parameters are adjusted to increase the gas concentration; when the gas concentration cannot be increased to be larger than or equal to 25%, a low concentration gas extraction system is used for extracting, the low concentration gas extraction system is adopted to extract the low concentration gas source and the high concentration gas source which does not meet the high concentration gas extraction conditions; and meanwhile, an air distribution system is started to dilute the gas concentration to be less than 3%. According to the coal mine gas extraction method, the purpose is to provide the coal mine gas extraction method, the gas concentration serves as the central control parameters, the high concentration extraction system and the low concentration extraction system are adopted to replace a traditional high negative pressureextraction system and a traditional low negative pressure extraction system, the extraction gas concentration is avoided being located in an explosion zone, and the intrinsic safety of the gas extraction in coal mine is realized.

The invention belongs to the technical field of coal-mine gas treatment, and particularly relates to a high-yield and high-efficiency working face gas ground mining method of a low gas mine. The problems that a coal seam is large in breathability coefficient and low in gas, a large amount of gas gushes out of a mine, a conventional underground gas mining mode has certain limit, the construction difficulty is large, the cycle is long, and the large joint pressure of digging and mining the mine is caused are solved. The method specifically comprises the following steps of 1, laying out a mining well; 2, drilling the ground, wherein (1), in primary drilling, a phi 425 mm rock bit is adopted, (2), in secondary drilling, a phi 311.1 mm drill is adopted to be drilled into a coal seam, (3), after drilling is completed, as coal mining of the working face is carried forward, and during communication between fissure zones formed in coal mining and the ground mining well, a ground mobile pump station is adopted to begin negative pressure drainage, and (4), after coal mining is conducted, a goaf is formed, and drainage continues through drilling. The method gives full play to efficient mining and short construction period of the mining mine, coal-mine gas is treated, and the production efficiency of the coal mine is improved.

The invention provides a surface type extraction method based on gob-side entry retaining gas treatment. The surface type extraction method mainly includes the steps that before a gob-side entry retaining artificial closed wall is constructed, gas extraction pipes are reserved on a top plate and a bottom plate of the closed wall at intervals, wherein the length of the extraction pipes is determined according to the length of an air leakage belt of a mine working face; gas is extracted, wherein the gas extraction pipes are communicated with a main extraction pipeline, a gas extraction pump is started for extraction. The method can effectively solve the return airway transfinite gas problem caused by gas released by residual coal, and the extraction effect is good. Construction is easy, andoperation construction can be carried out on the premise that normal ventilation of a return airway is not affected. Extraction holes in the gas extraction pipes are formed in the same side and are quick to drill. The extraction holes in the upper side and in the lower side are oppositely formed, that is, the extraction holes are formed face to face, and an extraction wall for surface type extraction is formed so that goaf gas carried by leaked air of the working face can be effectively intercepted, and the ventilation burden of the return airway is greatly relieved.

The invention relates to a ''U-and-U plus upper corner pump drainage'' stoping surface gas control method. The method comprises the steps of U-and-U roadway arrangement, underground fixed extraction pump station system building and stoping surface normal bedding drilling, roof high-position drilling, and upper corner pump drainage arrangement. The manner of U-and-U roadway arrangement comprises two U-shaped ventilation system roadways; extraction is conducted through normal bedding drilling in a stoping surface air inlet roadway and a stoping surface air return roadway as well as roof high-position drilling in the stoping surface air return roadway; a backup surface air return roadway is used for stoping surface assisting air return; an embedded tube is arranged in a goaf and an extractionpipeline is arranged at an upper corner; and goaf embedded tube extraction and stoping surface upper corner extraction are realized. Compared with the prior art, the problem that large air amount isinduced into the stoping surface in case of multi-roadway ventilation so air leakage in mined-out areas is intensified and causes abnormal emission of gas is avoided, and the problems that in thick coal layer mined-out areas, excessive residual coal causes low stoping efficiency and stoping surface safety production is restricted by large emission of the gas in the mined-out areas are solved.

The invention relates to a goaf gas collection zone partition extraction method. The technology used includes the following steps that an upper corner area of a fully-mechanized face is separated froma goaf through isolation walls; the isolation walls are built by regarding anchoring cables as frameworks and by waste materials such as underground gangue, and is sprayed with airtight spraying materials; as a working face advances, the isolation walls are arranged at intervals, and an air returning side gas collection zone in the goaf is divided into several isolation zones; in isolation areasfrom the working face into the goaf phase; nogs are arranged to assist and support top plates; extraction main pipes arranged in air returning lanes are divided into a plurality of extraction side pipes which are correspondingly connected into each partition, simultaneous extraction in the goaf air returning side deep portion and upper corner surrounding areas are achieved, and gas over-limit caused by a large amount of high concentration gas gathering in an upper corner is avoided; and when new isolation walls are set up and the extraction side pipes are can enter the goaf, a plurality of holes are correspondingly distributed on the extraction pipes, the extraction air inlet area is increased, and the extraction amount is increased.

The invention discloses ultra-high pressure long arm coal mass water injection hole sealing equipment and a using method thereof. According to the ultra-high pressure long arm coal mass water injection hole sealing equipment and the using method thereof, a coal mass long arm water injection hole can be sealed rapidly, and water is injected into a coal mass. The hole sealing equipment comprises a grouting pump, a hole sealing material pressure-injection pipe and a hole sealing pipe. The depth of inserting of the hole sealing pipe into a water injection drilled hole is a. The grouting pump is connected with the hole sealing pipe through the hole sealing material pressure-injection pipe. The depth of inserting of a water injection pipeline into the water injection drilled hole is b, and b is larger than a. The tail end of the water injection pipeline is wrapped with an inner cotton plug. The parts, at a hole opening of the water injection drilled hole, of the hole sealing pipe and the water injection pipeline are wrapped with outer cotton plugs. A cavity between the outer cotton plugs and the inner cotton plug serves as a hole sealing cavity. By adopting the process method, the water enters into the coal mass to release part of gas, so that the gas content of the coal mass is decreased effectively; and after the effect of water injection is achieved, the amount of dust can be decreased by 80% or above, the operation environment of a worker is improved, a dust explosion accident is eradicated, the coal mass is moistened, the cost is reduced, and the security of the worker is increased.

The invention relates to a flue gas displacement reinforced goaf gas extraction and goaf fire preventing and controlling method. The flue gas displacement reinforced goaf gas extraction and goaf firepreventing and controlling method is suitable for underground use of a coal mine, and comprises the steps that during the stoping process, a rock stratum above a goaf is broken and moved, an annular fracture zone is formed at the position of a caving arch, gas released in the stoping process is enriched, and gas injection pipelines are arranged on a roadside of the outer side of an air inlet lanein a paved mode and buried into the goaf; a drilling field is arranged at one side of an air return lane, pumping and extracting drilling holes are formed in from a drilling field to the caving arch position of the goaf, factory waste flue gas is injected into the goaf through the gas injection pipelines, and the gas enriched in the fracture zone is pumped and extracted through the pumping and extracting drilling holes; the flue gas is used for inhibiting the spontaneous combustion of residual coal in the goaf, the flue gas is injected into the goaf to balance the air pressure in the goaf by using belt pressure, and the air leakage of a working surface to the goaf is weakened; and flue gas is used for replacing, displacing and lifting the gas in the residual coal and surrounding rock to float to the fracture zone, and the gas pumping and extracting amount and the gas pumping and extracting concentration in the pumping and extracting drilling holes are improved to achieve the effects ofthe prevention and control of the fire in the goaf and improving the quality of the gas pumping and extracting.

The embodiment of the invention discloses a scanning protocol parameter determination method and a magnetic resonance system, and the method comprises the steps: setting scanning protocol parameters which are used for exciting one or more slice layers of a target object, and comprise a layer selection gradient, a phase coding gradient and a frequency coding gradient; when it is detected that the scanning protocol parameters enable a target object to have a to-be-scanned slice layer with PNS ultralimit in the magnetic resonance data acquisition process, updating the scanning protocol parameters, the updating method of the scanning protocol parameters comprising the following steps: determining an application direction of one or more of a layer selection gradient, a phase coding gradient and a frequency coding gradient based on a golden proportion algorithm; and performing magnetic resonance imaging on the target object according to the updated scanning protocol parameters. The problem that time and labor are wasted when scanning protocol parameters are modified in a magnetic resonance scanning method in the prior art is solved.

The invention discloses a high gas coal mining working face gas improving method with a tunnel replaced with a well. The high gas coal mining working face gas improving method adopts the following steps that Step1, space positions of a mining area ground well vertical well, a mining area L-shaped ground well and a high position drilling hole are optimized and arranged; Step 2, instant gas extraction quantity of the mining area ground well vertical well, the mining area L-shaped ground well and the high position drilling hole is calculated correspondingly, and gas quantity q that can be desorbed instantly after extracting; Step 3, gas quantity q' instantly pouring out from the coal mining working face is calculated; and Step 4, whether a measure replacing the tunnel with the well achieves the purpose that improves coal mining working face gas over limits and remedying measure and improves the high gas coal mining working face gas with the well replacing the tunnel or not are assessed. According to the high gas coal mining working face gas improving method with the tunnel replaced with the well, the over limit problems of the coal mining working face, an upper corner and an air return tunnel can be solved, extracting with the measurewith the tunnel replaced with the well achieves the requirement of coal mining working face improving, and meanwhile, the construction cost is greatly reduced.

The invention relates to the technical field of coal mine gas extraction, and discloses a method for extracting top coal gas during a fully-mechanized top coal caving period of an extra-thick coal seam. The method comprises the following steps of (1) designing bedding directional long drilling parameters: designing the bedding directional long drilling parameters according to coal seam occurrence conditions and firmness coefficients; (2) conducting directional drilling construction, specifically, conducting bedding directional long drilling on the coal seam before working face stoping, connecting a pipeline to a hole opening, and the pipeline is connected with negative pressure extraction equipment; (3) crushing the top coal: repeatedly supporting and extruding the top coal by a bracket of a stope face to generate cracks in the coal seam, and continuously desorbing the gas in the coal seam; and (4) conducting top coal caving: during the top coal caving period, a large amount of gas rushes to the top of the working face and is continuously pumped out through a drill hole. The method solves the problem that a large amount of desorbable gas generated in the coal caving period cannot be effectively extracted in time through a coal seam roof high-position drilling hole or a high drainage roadway, the desorbable gas instantly flows into the working face, so that the gas of an upper corner or a return airway exceeds the limit.

The invention provides a totally-closed blowout prevention dust falling device which is characterized in that a transverse dust baffle is arranged in a blowout prevention box body, the dust baffle is installed on the inner wall of a dust prevention box body, and a backflow opening is formed between the dust baffle and the inner wall of the dust prevention box body; an air inlet and an air outlet are formed in a top plate of the blowout prevention box body, and the air outlet is located above the dust baffle; the air inlet pipe is inserted into the blowout prevention box body from the air inlet and penetrates through the backflow port; the air outlet pipe is installed on the air outlet. According to the invention, the hole spraying prevention and dust removal effects in the drilling construction process are improved, the working environment is improved, and the safety is guaranteed.

The invention provides a method for extracting gas in adjacent sections through non-coal-pillar gob-side entry retaining, relates to the technical field of gas extraction, and aims to solve the problem that the existing coal-pillar-free mining method cannot effectively reduce gas overrun of a driving face. The method for extracting the gas in the adjacent sections through the non-coal-pillar gob-side entry retaining comprises the following steps that first bedding drill holes are formed in the gob-side entry retaining of a stope face and a first mining face transportation roadway in the inclined direction of a coal seam, and the tail ends of the first bedding drill holes are located at the position of a connecting face track roadway of the adjacent sections; and in the tunneling process of the connecting face track roadway tunneling working faces of the adjacent sections, second bedding drill holes are formed in the connecting face track roadway tunneling working faces in the coal seam trend, so that the second bedding drill holes and the first bedding drill holes form a latticed three-dimensional intersection state, and the second bedding drill holes communicate with the first bedding drill holes at least through cracks. By means of the method for extracting the gas in the adjacent sections through the non-coal-pillar gob-side entry retaining, gas overrun of the driving face can be effectively avoided.