654 results about "Coal mine methane" patented technology

The invention provides a method for extracting coal bed gas by up-hole and down-hole combination, and relates to the technical field of extracting the coal bed gas (or named as gas). The method can solve the technical problem of pre-extracting the coal bed gas of a coal bed, in particular for a low-permeability coal bed. The method for extracting the coal bed gas by the up-hole and down-hole combination comprises the following steps: carrying out vertical drilling into the coal bed from ground to the coal bed, carrying out an extracting channel in the down hole along the coal bed, and then closing the extracting channel to form a down-hole extracting system; and injecting overheating vapor or overheating water from the ground vertical to the coal bed, displacing the coal bed to flow into the down-hole extracting channel along the coal bed, and then transporting the extracted coal bed gas into a ground coal bed gas system. The method overcomes the deficiency of the prior art, can simply, reliably and efficiently pre-extract the coal bed gas of the coal bed, and in particular for the low-permeability coal bed in large areas, and can basically solve the problems of coal mine gas disasters and the coal bed gas exploitation.

The invention discloses a coal-mine gas geology four-dimensional analysis method. The method includes acquiring depositional environment data, geologic structure data and hydrocarbon generating history data, and determining a gas enrichment save state, a gas occurrence main controlling factor and a coal and gas outburst risk degree in a study area; then performing gas geology unit division and testing point arrangement; and finally establishing a gas occurrence mathematical model and forming a gas geologic map. According to the coal-mine gas geology four-dimensional analysis method which is established from four-dimensional angles of space ( an area or a layer ) and time, original coal-mine gas geology analysis methods are broken through; the difference problems of gas occurrence or coal and gas outburst disasters on different coal layers, which can not be explained by traditional gas geological theories under same geologic structure conditions on the layer, are solved; and area and layer analysis of coal-mine gas geologies is achieved, problems that a gas geology unit is difficult to divide and different persons acquire different results according to the same data are solved, the work loads of gas geology analysis are reduced, and the guide of safety production is truly achieved.

This invention relates to a method and a gas dissolvant for the frequent gas explosions in coal mine. Its procedures are as following: the gas dissolvent and water are poured in turn into the coal seams containing gas. The gas dissolvent is a kind of water solution made up of acetum and yeast which selective weight ratio is 1000:5-15. The acetum is preferred to be replaced by vinegar of the same acetum. After the vinegar is added into the yeast, their dehydro-ratio is 2-8 times as heavy as the vinegar. The advantages are safety efficient, more feasible and harmless to human body.

The invention relates to an experiment device and method for simulating gas-coal dust explosion in underworkings of a coal mine, and belongs to the technical field of safety engineering of the coal mine. Requirements on the experiment device and method for the gas-coal dust explosion in the underworkings of the coal mine are met. Gas-coal dust is poured into an explosion cavity, and when a pressure value in the explosion cavity is equal to that of outside atmospheric pressure, a high-energy ignition cabinet controls an ignition electrode on the explosion cavity to ignite, so that the explosion experiment of the gas-coal dust is realized, and exploded gas and the like are diffused through a gas explosion diffusion pipeline and gas explosion diffusion branches; pressure sensors and flame sensors are used for monitoring the pressure and the flame in the gas explosion diffusion pipeline during explosion in a real-time manner, and transmitting pressure data and flame data to a high-speed data acquisition unit, and the pressure data and the flame data are saved in an industrial computer. The experiment device and method disclosed by the invention are suitable for observing gas explosion of the coal mine.

The invention relates to a combined hole sealing method for gas extracting and drilling delaying self-expansion capsule-paste. The technical scheme is that two delaying self-expansion capsules are adopted to plug a hole bottom and a hole opening; an annular space between the two capsules is full of paste hole sealing material with pressure so as to further seal cracks around a drilled hole; and therefore, the gas tightness of the gas extracting and drilling is guaranteed. According to the combined hole sealing method for the gas extracting and drilling delaying self-expansion capsule-paste, the gas tightness of the coal mine gas extracting and drilling is improved, the extraction effect can be enhanced, and the later-stage extraction effect is obviously improved. The combined hole sealing method for the gas extracting and drilling delaying self-expansion capsule-paste has the advantages of simple technology, is convenient to operate and the like.

The invention discloses a process and a system for purifying, separating and liquefying nitrogen-and-oxygen-containing coal mine methane (CMM). The process for purifying, separating and liquefying the nitrogen-and-oxygen-containing CMM comprises the following procedures of: pre-deoxidizing; pressurizing and cooling; deeply removing acid gas; deeply dehydrating and drying; deeply removing mercury and filtering; liquefying at low temperature; and rectifying at low temperature. The system for purifying, separating and liquefying the nitrogen-and-oxygen-containing CMM consists of a deep acid gas removing unit, a deep dehydrating and drying unit, a deep mercury removing and filtering unit, a low-temperature liquefying unit and a low-temperature rectifying unit. By the system, concentration of the produced liquefied natural gas (LNG) is as high as 99 percent, and the recovery rate of CH4 in the CMM is as high as 99 percent. The process and the system are favorable for recycling the CMM on a large scale, producing the LNG and reducing CMM accidents and environmental pollution.

A coal mine two-end gas plug and middle water seal layer penetrating drill hole sealing device comprises a gas extraction pipe, a gas injection pipe and a water injection pipe which are arranged in parallel.A first limiting block, a first expansion gas bag, a second limiting block, a third limiting block, a second expansion gas bag and a fourth limiting block are sequentially arranged on the gas extraction pipe from inside to outside, an inner end opening of the gas injection pipe is communicated with the interior of the first expansion gas bag, a gas injection hole communicated with the interior of the second expansion gas bag is formed in the gas injection pipe, and an inner end opening of the water injection pipe is located between the second limiting block and the third limiting block.The invention further discloses a hole sealing method.Cheap water and air are adopted as hole sealing materials in the device and the method and can be supplemented through an underground air compression system and a water supply system as needed to ensure good hole sealing quality, the whole device can be recycled and reused after the extraction work is finished, pollution to a coal body, underground water and underground air can be avoided, the safety level of a mine is improved, and popularization of the novel coal mine gas treatment technology can be easily promoted.

The invention discloses a coal-mine gas-burning torch which comprises a burner and etc. systems including an insulation layer arranged inside a casing; a regenerative honeycomb ceramics and a bracket thereof which are arranged in the middle of the insulation layer, a proportioning mixer and a multi-head mixed-gas nozzle which are arranged on a lower part of the bracket; an upper sealing cover arranged at the upper end of the casing and a lower sealing cover and a base which are arranged at the lower end of the casing; a pipeline and a main gas supply valve which are connected with the proportioning mixer; a pressure-regulating valve, a flame arrester, a filtering dehydrator, a hydroseal flame arrester, an electronic-control valve and a gas diffusion valve which are sequentially connected; a fan which is arranged inside the base under the casing and connected with the lower part of the proportioning mixer; an electronic ignition system comprising an LPG fuel supply valve, a gas supply valve connected with a gas transferring pipeline and an electronic igniter communicated with the lower part of the burner; a temperature sensor arranged in the regenerative honeycomb ceramics; an air pressure sensor arranged at the back of the fan; a gas concentration sensor, a gas pressure sensor and an electronic-control valve which are arranged in the gas transferring pipeline system and a controller arranged on the lower part of the casing.

The invention relates to a coal mine gas extraction hole sealing material. The coal mine gas extraction hole sealing material comprises, by mass, 60-80% of ordinary portland cement, 15-25% of an expanding agent (such as calcium sulphoaluminate and calcium sulphoaluminate-calcium oxide), 0-10% of gypsum, 0.1-0.3% of a foaming agent (such as solid aluminum powder or liquid hydrogen peroxide producing gas in an alkaline environment), and 0.2-0.5% of caustic soda, and the above materials and water are blended according to a mass ratio of 1: 0.6-1. The coal mine gas extraction hole sealing material has good expansibility, has an expansion coefficient greater than 10%, compressive strength greater than 10Mpa, good fluidity and short solidification time, is convenient for use and has a low cost.

The invention discloses a millisecond multilevel directional blasting dry ice fracturing method and an exploding pipe. The method comprises the following steps: 1) drilling a blast hole and a pumping hole in a coal seam working surface; 2) preparing the exploding pipe; 3) filling the exploding pipe into the blast hole, connecting the end part on the inner side of the exploding pipe with the hole bottom of the blast hole, sealing an opening part at the external end of the blast hole by using the sealing tamping plug and guiding a leg wire of a millisecond delay electric detonator of each exploding unit out of the blast hole; 4) gradually exploding each exploding unit at interval of 40 milliseconds by the millisecond delay electric detonator in the sequence from interior to exterior of the blast hole. According to the invention, the generated quantity of cracks can be effectively controlled, the extending distance of the cracks can be increased without serious damage to the hole wall, CO2 generated by dry ice subliming along with the extension of the cracks can effectively displace the coal-mine gas, the gas discharging efficiency can be increased, and meanwhile, in the subliming process of the dry ice, a large quantity of exploding heat can be absorbed, the exploding temperature can be reduced and the exploding process is more safe and reliable.

The invention discloses a gas control method for triple-purpose use of drilled holes in a coal floor of a close distance seam group, and belongs to coal mine gas control methods. In the coal floor of a mine, drilled holes in the same drill site are used, and gas extraction is performed according to the steps as follows: firstly, before coal mining, gas in a coal seam is extracted in advance through the drilled holes in the coal floor of the mine, and danger of the outburst of coal in the coal seam at the upper part and the gas is eliminated; secondly, the coal at the upper part is mined, when the coal seam at the upper part is mined, mining pressure relief and stress relief are caused to coal seams at the upper part and in the middle, the drilled holes of the original drill site are used, and gas in the coal seams at the upper part and in the middle in a mining pressure relief zone is extracted in a negative pressure manner; and finally, the coal seam in the middle and the coal seam at the lower part are mined, and simultaneously, the original drilled hole is used again, and gas in a mining layer is extracted in the negative pressure manner. The work efficiency can be improved, the gas extraction efficiency is high, the cost is saved, the concentration of the extracted gas is high, and the utilization of the gas is facilitated. The gas control method comprises the control of gas in close distance seam groups of two or more coal seams.

The invention discloses a coal-mine gas extraction drilling pressurized grouting rapid hole packer and a use method thereof. A hole packer comprises a grouting pipe and capsular bags, wherein the grouting pipe is divided into a front second and a rear section; a double-circular air pressure blast valve is arranged between the front-section and rear-section grouting pipes; the double-circular air pressure blast valve is connected with the grouting pipes on the two sides through a thread head and a withholding type rubber hose connector; the front-section grouting pipe and the rear-section grouting pipe are sleeved with a capsular bag respectively; the two ends of the capsular bag on the front-section grouting pipe are withheld and fixed on the grouting pipe through a metal sleeve; the front end of the capsular bag on the rear-section grouting pipe is withheld and fixed on the grouting pipe through a metal sleeve while the rear end is fixed on the grouting pipe through a plug; and the part of the grouting pipe surrounded by the two capsular bags is provided with an annular one-way valve. In the coal-mine gas extraction drilling pressurized grouting rapid hole packer, airtight hole sealing is realized by the pressurized grouting technology; the hole packer has the advantages of multi-layer pressurized grouting and strong hole sealing airtightness; and moreover, the whole structure is simpler, the hole sealing operation is simpler and more reliable, and the airtight effect is better.

The invention provides deep low-permeability high-gas coal seam drilling-cutting-sealing-pressing drilling equipment and method, and relates to the technical field of coal mine gas extraction and dustfall. The equipment comprises a drilling control system, a high-pressure hydrodynamic system, a water pressure grading control system and a fracturing plugging control system, wherein the drilling control system adjusts the drilling direction of a hole-drilling drilling rod and the water supply pressure of the drilling rod, high-pressure hydrodynamic system provides high-pressure water with different pressure for the equipment, and the water pressure grading control system ensures that the drilling and drilling cutting washing water pressure is smaller than 5 MPa, the water pressure for a cutting seam in the direction perpendicular to the length of the drilling rod is 25-35 MPa, the sealing water pressure of a sealing capsule is 35-40 MPa, and the water pressure of further pressure reliefand anti-reflection of a coal seam is 40-50 MPa; and the fracturing plugging control system finishes hole sealing and hydraulic fracturing construction control. According to the method for constructing drilling holes, slitting in the holes, hole sealing and the hydraulic fracturing by utilizing the equipment, the integrated construction of the single equipment is realized, and the construction efficiency of gas drainage hole drilling and coal seam dust prevention is improved.

The invention relates to a method for draining coal seam gas, belonging to a method for pre-draining coal seam gas in coal mines. According to the invention, the technical problem that the existing methods for draining coal seam gas are low in drainage efficiency is solved. The technical scheme of the method for draining coal seam gas comprises the steps of: firstly opening at least one butt hole drill site in a coal mine underground preparation roadway, constructing a 30-50m long butt drill hole from the butt hole drill site to a target coal seam, lowering a seamless steel sleeve to the butt drill hole and solidifying the hole by high-quality cement, then opening a ground drill site at the far end of a designed drainage area, horizontally and directionally drilling a horizontal directional main branch hole along the target coal seam toward the underground butt drill hole, butt-jointing the horizontal directional main branch hole with the underground but drill hole, enclosing the ground orifice, arranging an orifice control valve on the head of the seamless steel sleeve, connecting the control valve with a coal mine underground gas drainage pipe network, and carrying out gas drainage by using a coal mine gas drainage pump.

The invention provides an intelligent control system for gas extraction of an underground coal roadway and a control method of the intelligent control system, and belongs to intelligent regulation and control of a gas extraction system of a coal mine. The intelligent control system comprises a regulation system and an alarming system; and the regulation system consists of a gas concentration sensor, a flow sensor, an electric valve, a regulation signal acquiring circuit, a single-chip microcomputer, a relay driving circuit and a valve driving circuit. According to a method of the regulation system, the opening degree of the electric valve is sequentially regulated from big to small; the maximum value of pure flow is found out under the condition that requirements on minimum concentration of gas extraction are met; the electric valve is set at the opening degree corresponding to the maximum pure flow and is automatically reset after a period of time; and the above procedures are carried out again. The alarming system consists of a gas concentration sensor, an alarming acquiring circuit, a single-chip microcomputer, a liquid crystal display circuit and a buzzer circuit. According to a method of the alarming system, alarming signals of the gas concentration sensor are processed through the single-chip microcomputer; the buzzer circuit gives an alarm; and the liquid crystal display circuit displays a gas leaking place. By the intelligent control system for gas extraction of the underground coal roadway, extraction is controlled intelligently and an optimum extraction effect is achieved.

The invention relates to a method for sealing a coal-mine gas pre-drainage borehole by adopting an inflatable capsule as a temporary borehole bottom. The method is mainly to solve technical problems of the prior g method for sealing the borehole, such as high sealing cost, low efficiency and inconvenient operation. The invention adopts the technical proposal that: the method for sealing the coal-mine gas pre-drainage borehole by adopting the inflatable capsule as the temporary borehole bottom comprises the following steps of: a. lifting a drilling tool and placing an borehole orifice pipe into a borehole, after a gas pre-drainage drill drills to a terminal drilling depth; b. sending the inflatable capsule into the borehole and inflating the inflatable capsule to form the temporary borehole bottom; c. filling cement mortar from the borehole orifice pipe, until the cement mortar is filled with the whole annular space; d. deflating the inflatable capsule and restoring the inflatable capsule to the original state, after the cement mortar is solidified, taking out the inflatable capsule from the borehole orifice pipe to complete sealing. The method is particularly applicable to sealing operations for the gas pre-drainage borehole which uses rigid plastic or other materials to make into the borehole orifice pipe and the gas pre-drainage borehole with poor shaping in a soft coal seam.

The invention provides a method and a system for gas pumping of high-gas coal mines. The method for gas pumping of high-gas coal mines includes: setting a wellhead of a horizontal well on the ground; setting the horizontal well communicated with the wellhead of the horizontal well in a fissure zone; and setting a vacuum pump on the ground and enabling the vacuum pump to extend into the wellhead of the horizontal well to pump the horizontal well. The system for gas pumping of high-gas coal mines comprises the horizontal well and the pump, wherein the horizontal well is arranged in the fissure zone and communicated with the ground, and the pump is positioned on the ground and communicated with the horizontal pump. Horizontal well drilling and coal mining theories are organically combined to transplant underground works to the ground for implementation, so that risks of coal mine underground construction are reduced.

The invention discloses a method for exploiting coal bed methane (CBM) by water transportation and pressure relief in a butted well, relieving pressure. A coal water and gas discharging well (1) and a plurality of injection gas discharging wells (5) are arranged, wherein the coal water and gas discharging well (1) collects a discharged coal-water mixture and CBM, the injection gas discharging wells (5) are used for injecting water and collecting the CBM, a gas-coal-water separating device is arranged at the well mouth of the coal water and gas discharging well (1), the separated water is recycled, the injection gas discharging wells (5) are arranged a well-closing position for feeding water and discharging gas, the bottom of the coal water and gas discharging well (1) is caved, and the injection gas discharging wells (5) and the coal water and gas discharging well (1) are butted by a fluid pressure difference or mechanical drilling and other methods. Then, water is injected in the injection gas discharging wells (5), a stream flushes a coal body, moves to the coal water and gas discharging well (1), is discharged and forms a pressure-discharging space (6), and the rest coal layers yield the CBM. The technology can solve the problem of preliminarily pumping CBM from a floppy and low-permeability coal reservoir, eliminate the outburst risks and decrease the gas content of the coal body.

The invention discloses a heat accumulation type super-low calorific value fuel gas treatment and energy utilization device, which is applied to reciprocal flow heat accumulation type combustion technology of the super-low calorific value fuel gas in industrial production. The device consists of a device body, a periodic reverse gas flow circulating pipeline and a measurement and control system. The self-maintenance combustion of super-low calorific value fuel gases with extremely low methane concentration, such as coal mine methane, gases produced in municipal solid waste landfill, combustible gases produced during pyrolysis and smolder (such as battery heating) of biomass in nature and in the lives of human society and the like, can be realized in the device; and because the aperture of low-porosity porous medium filled in a porous medium packed bed of a combustion chamber is less than the quenching diameter, the combustion can be controlled within the combustion chamber. In addition, a part of heat produced by the combustion of the super-low calorific value fuel gas is pumped out by a smoke suction device and conveyed to the conventional exhaust heat boilers for heating water for heating or producing super-heated steam for power generation; and thus the device has the advantages of energy conservation and environmental friendliness.

The invention relates to a coal-rock simultaneous production protecting seam and protected seam collaborative mining method applicable to multi-seam combined mining under poor mining conditions of protecting seams. According to the time-space relationship characteristics that one coal-rock protecting seam and one previous protected seam are mined simultaneously during multi-seam combined mining, when the coal-rock protecting seam is mined, the mined coal and rock are separated, washed and crushed according to size and conveyed to a mined out area of the previous protected seam for filling the mined-out area, gangue mined out excessively is prevented from being discharged out of a mine, the gangue does not need to be lifted from the mine, and the lift cost is reduced; the mined rock can be used as underground mine-fill after being treated, the problem about sources of the mine fill is solved, and ground surface settlement is prevented effectively. By the method, pressure-relief mining of the coal-rock protecting seams is realized, meanwhile, green fill mining of the previous protected seams is realized, high-efficient treatment of coal-mine gas is ensured, the coal-rock protecting seam mining is safer, more efficient and greener, and significant economic and social benefits are obtained.