RU2616954C2 - Coal mine ventilation system and device for methane recovery from mine air (versions) - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: ventilation system comprises at least three air ducts, clean air flows through one of the forced draft air ducts, wherein forced draft canopy area considerably exceeds the air duct section. The mine air containing concentrated methane is extracted through the second air duct connected to device for methane recovery from the mine air and mounted at the highest points of the coal heading, wherein the exhaust canopy area considerably exceeds the duct section. The contaminated mine air is extracted through the third air duct, which is mounted at the lowest points of the coal heading. The air ducts spread from the working face to the ground surface. Gasproof partitions are mounted on the ceiling portion along the full length of excavation transversely to the longitudinal direction. Air balloons filled with incombustible gas are attached to the coal heading ceiling with cords, wherein the air balloons are heavier than methane but lighter than the air. Sensors fixing the air balloons height level are mounted at level of gasproof partition lower part, designed to transmit a command for increasing or decreasing the drawing speed of the mine air containing methane and to discharge the clean air. Device for methane recovery from the mine air, flowing from the mine, comprising a sealed tank, air balloons filled with incombustible gas are attached to its ceiling part, wherein the balloons are heavier than methane but lighter than the air. Sensors fixing the air ballons location level are mounted at level of the middle part and higher, designed to transmit a command for increasing or decreasing the drawing speed of methane/air enriched in methane. The air duct feeding the mine air flowing from the mine and comprising a large number of methane is mounted at level of the middle part and lower.

EFFECT: prevention of explosions due to accumulation of methane-air mixture under roof with the possibility of subsequent concentration of methane-air mixture for further use.

7 cl, 5 dwg

Description

The invention relates to the mining industry, mainly to the coal, and can be used to prevent disasters in mine workings.

The probability of outbreaks and explosions of methane and coal dust is directly proportional to the probability of the formation of explosive dust-methane-air mixtures in mine workings. There are various methods and devices for preventing the explosion of a methane-air mixture in mine workings, based on the prevention of a methane explosion. Methane in the coal seam is kept in a free state (up to 10%) and its main part is in a sorbed state. When coal is destroyed in a combine breaker, naturally methane, which is in a free state, and part of the sorbed methane, fall into the air stream of the face.

Found on the Internet URL: http://www.ukkbel.ru/content/articles/index.pxp?article=1850

Methane gas and its properties. Methane (CH4) without color, odor and taste.

Density - 0.554, 2 times lighter than air. Slightly soluble in water. It burns with a blue flame up to 5% and after 15%, explodes from 5% to 15%, the largest explosion force is 9.5%. Ignition temperature 650-7500 ° С. The speed of the blast wave is 500-600 m / s.

People who fall into the explosion zone are exposed to the mechanical action of the blast wave and high temperature.

Coal mine methane is a gas contained in coal seams and surrounding rocks. It is a natural gas by origin and a by-product of the development of coal and gas deposits. Mine methane is extracted to the surface by vacuum pumping stations through specially drilled wells, while it is mixed with air entering the mine. In all cases, the use of the methane-air mixture obtained as energy fuel is determined by its composition, i.e. the ratio of methane as such and air. The use of mine methane as a fuel for the production of heat and electric energy increases profitability and reduces the explosion hazard of coal mining, reduces emissions of harmful substances into the atmosphere, and improves the environmental situation.

Found on the Internet URL: http://www.kr61.ru/data/document/1436.doc

The mine category is determined by the amount of methane released to

1 ton of average daily mine production (relative methane mobility)

1. of the first category - up to 5 m ³ / t;

2. second category - from 5 to 10 m ³ / t;

3. of the third category - from 10 to 15 m ³ / t.

Supercategory - 15 m ³ / t or more, and also dangerous by soufflary secretions.

Found on the Internet URL: http://ukkbel.ru/content/articles/index.php?article=1849

For ventilation of deep mines, as well as mines with a large network of branched workings, when it is necessary to supply a significant amount of air, the injection-suction method of ventilation is used. With this method of ventilation, one or two fans pump fresh air into the shaft and the same number of fans draws in contaminated air from the shaft. With this method, a draft is formed that raises the coal dust and ultimately forms a methane-coal mixture, which is much more explosive than just a methane-air mixture. Pathological anatomy of anthracosilicosis: Coal dust causes the development of dense, dark-colored cell-dust foci, which are clusters of cellular elements with absorbed coal particles and reactive pneumosclerosis.

Found on the Internet URL: http://www.blackpantera.ru/profzabolevanija/22925/

Means are also known for preventing the explosion of methane and coal dust in mines using a physicochemical effect on a methane-coal mixture. USSR author's certificate N 977822, Ε21F 5/00, publ. 11/30/82. Such means are sodium chloride, water with the addition of surfactants, potassium chloride. However, since the release of the methane-carbon mixture is probabilistic, it is difficult to effectively use these funds, since it is difficult to predict the time and place of the release.

A closer technical solution is the operation of the Mine WATCH PC21 methane monitoring systems of the British company Davis Derby installed in Ulyanovsk and other mines of Yuzhkuzbassugol. They were purchased for 100 million rubles. in 2005 (another 400 million rubles cost of their implementation at the concern's enterprises) after an explosion at yet another Yuzhkuzbassugol mine, the Esaulskaya mine, which killed 25 people, Mine WATCH PC21, according to the miners, raised the alarm times per shift. As a result, because of the frequent stops of the equipment, the Ulyanovsk miners could not work normally, and it was exhausting. An explosion results in gas contamination at a level of 4% to 15.5%. The disadvantages of the Mine WATCH PC21 methane monitoring system of the British company Davis Derby are as follows: when a minimum and safe amount of methane is emitted near the sensor, the system will sound an alarm and stop the mine, while the alarm is often false.

The disadvantages of this system:

1. The Mine WATCH PC21 system cannot distinguish false alarms (low methane emissions) from justified alarms (high methane emissions).

2. Due to repeated evacuations on alarm, coal production is reduced with all the consequences.

3. The high price of Mine WATCH PC21 systems at low efficiency.

4. The system acts as a statistician of methane emissions.

Mine WATCH PC21 system is inefficient and not promising.

Currently, coal mine safety systems are the installation of sensors that test the concentration of methane. At the Ulyanovskaya mine in the Kemerovo region, the latest equipment from the UK was installed, which was supposed to respond to a dangerous concentration of methane. When the sensors were triggered, the electrical equipment was immediately turned off so as not to cause sparks. The limitations of the method are: the ability to prevent the explosion of the coal-air mixture only when working in the face in particularly hazardous gas and dust horizontal and uprising mine workings, which does not guarantee absolute reliability in preventing catastrophes from the explosion of the coal-air mixture in mines; there is no possibility of preventing an explosion along the entire length of the shaft; it is impossible to prevent an explosion with sudden methane emissions away from the bottomhole zone. Found on the Internet URL: http://tutestinfo.ru/223.html

The types of methane accumulation are local - the accumulation of small amounts of CH4 near combines, layered - in the form of a thin layer up to 1 meter and a length of up to 100 meters with an air stream velocity of less than 0.5 m / s. The layer floats under the roof without mixing with air.

The technical task of the proposed solution is:

1. Prevention of accumulation of methane-air mixture and removal of methane accumulations from under the roof, from domes and air pockets.

2. Prevention of layered accumulations of methane, causing explosions far from the bottom.

3. Control over the amount and speed of methane emitted.

4. Exclusion from an explosive mixture of coal dust as an integral part.

5. The collection of all methane in the mine, and its subsequent concentration to the required parameters for further use by industry.

Option 1. The task is ensured by the fact that the “Coal mine ventilation system”, which includes a pressure-suction ventilation method, in which one or two fans pump fresh air into the mine and the same number of fans draws out contaminated air from the mine, is supplemented by at least , with one suction duct extending from the face to the surface of the earth, while the exhaust hoods of which are installed in the ceiling along the entire length of the drift at the highest points.

There are various types of methane accumulation, for example - “Local accumulation” - accumulation of small amounts of CH4 near combines, drills, domes and other places. There are also “Layer accumulations” of methane - in the form of a thin layer up to 1 meter and a length of up to 100 meters at an air stream velocity of less than 0.5 m / s. The layer floats under the roof without mixing with air.

Found on the Internet URL: http://ukkbel.ru/content/articles/index.php?article=1849

The device operates as follows. In the bottom and the drift itself, the air duct suctioning methane is installed in the ceiling. Exhaust duct hoods in the ceiling are installed after 3-5 meters or more. Also, the suction duct can be fixed both in the lower part of the drift and in the middle part and fixed to the wall of the drift, and methane from the exhaust umbrellas enters the duct through the pipes, while the exhaust umbrellas in the ceiling are installed in 3-5 or more meters . There can be several exhaust ducts. For example, one suction duct serves only the face, while another or other ducts serve drifts, while exhaust hoods are installed in the ceiling along the entire length of the drift at the highest points. It is taken into account that mine workings have various cross-sectional shapes: Trapezoidal, Rectangular, Polygonal, Round and Arched.

Exhaust ducts pump out all methane and do not allow “Local accumulations”. The proposed additional exhaust shaft ventilation system will make the already existing “Coal Mine Ventilation System, including the discharge-suction ventilation method” more effective. Thanks to the new system, explosions are prevented due to the accumulation of methane-air mixture in the face, removal of methane accumulations from under the roof and air pockets, as well as the prevention of layer-by-layer accumulations of methane causing explosions far from the bottom.

Option 2. The invention is illustrated by drawings, where in Fig. 1 “Coal mine ventilation system” - longitudinal view, Fig. 2 Side of the face;

Coal mine - coal face - 1, a discharge duct installed at the level of human growth - 2, supplying clean air - 5 through an air umbrella 4 connected through a pipe 3.

Exhaust duct - 6, removing contaminated mine air with heavy fractions - 9 through an air umbrella 8, connected to an exhaust duct 6 through a pipe 7. At the top, an exhaust duct - 10, extracting mine air containing methane - 13, through an air umbrella 12 connected through nozzle 11. Balloons 15 on strong threads, sensors 16, fixing the level of balloons, a line showing the level of methane 14, across the drift from the ceiling down the gas-tight partitions - 17, the layer of coal mined (coal lava) 18.

The stated task is ensured by the fact that a fundamentally new “Coal Mine Ventilation System” is proposed, optimized and streamlined.

The operation of the ventilation system is as follows.

Clean air 5 enters the discharge duct 2, the mine air containing methane 13 is removed through the second exhaust duct 10, while the exhaust hoods 12 are installed at the highest points of the coal face 1 or drift, and the contaminated mine air 9 is removed through the third exhaust duct 6, including heavy fractions, while the exhaust hoods 8 are installed in the lowest possible places of drift or face 1. Across the longitudinal direction of the mine workings, gas-tight partitions are installed in the ceiling 16, balloons 15 are fixed to the ceiling of the drift on strong threads, while the balls are heavier than methane, but lighter than air. Balloons are filled with non-combustible gas, such as helium, and show the boundary between methane and mine air. If methane is released, light methane 13 takes up space near the ceiling, and slightly heavier balls 15 drop to level 14. If there is little methane in the bottom, the balls rise up. Heavy ordinary air keeps balloons 15 from dropping. At the level of the lower part of the gas-tight partitions 17, sensors 16 are installed that fix the level of 14 balloons. Gas-tight partitions 17 do not allow methane to spread over the drift. Sensors 16, fixing the rise and decrease of the balls, give a command to increase or decrease the drawing speed of mine air containing methane 13, and accordingly to inject clean air 5. To prevent air currents, the duct 2, through which clean air 5 enters, has an expansion in the form an air umbrella 4 or a perforated duct, in which the total area of the perforated material for the exit of air significantly exceeds the cross section of the supply pipe. The perforated duct may be made of metal or plastic, or the duct is fabric. The duct 6, through which the contaminated mine air 9 is pumped out, including heavy fractions, and the duct 10, through which the mine air enriched in methane 13 is pumped, have an expansion in the form of air umbrellas 8 and 12 or perforated ducts in which the area of the exit openings air far exceeds the cross section of the pipe. To optimize the “Ventilation System”, one complex, including three air ducts, serves exclusively the face, and other complexes “Ventilation Systems”, including at least three air ducts, serve the drifts.

The proposed "Ventilation System" due to the absence of drafts, which means coal dust, prevents the creation of a coal-air mixture in mines;

It also prevents the formation of a methane-air mixture per se, since methane 13 goes up, gathers near the ceiling and is immediately pumped out, and contaminated mine air 9, including heavy fractions, goes down and is also pumped out. Balloons 15 on strong threads fixed to the ceiling, while the balls are heavier than methane, but lighter than air, show the boundary between methane and mine air. Fig. 3 - shows the ventilation system of the coal mine in an inclined drift - side view. Coal mine - inclined drift 19, exhaust duct - 6, removing contaminated mine air - 9 through air umbrellas 8. At the top, exhaust umbrellas 12, extracting mine air containing methane - 13, balloons 15 on strong threads, sensors 16, fixing the location level balloons, a line showing the level of methane 14, gas-tight partitions - 17. Partitions are made of gas-tight and non-combustible material and are located from the ceiling about a meter down, across the course of the mine. The size of the partitions from wall to wall of the mine working without gaps, from the ceiling down from 0.5 meters to one meter. The task is ensured by the fact that the "Coal mine ventilation system" in an inclined drift, comprising at least three ducts. Clean air enters the middle duct, mine air containing methane is removed through the upper duct, mine air 9 containing contaminated air, including heavy fractions, is removed through the third duct 6. Gas-tight partitions 17 are installed in the ceiling part across the longitudinal direction of the mine working. At the level of the lower part of the gas-tight partitions, sensors 16 are installed that fix the level of balloons 15, and the balls themselves are fixed on strong threads to the ceiling part, while the balls are heavier than methane, but lighter than air . Gas-tight partitions are installed in such a way that the methane level line 14 runs from the lower point of the higher partition 17 to the upper point of the lower partition 17, and exhaust hoods 12 for mine air containing methane 13 are installed at the highest points of each ceiling section, and exhaust umbrellas of the lower level 8 are installed at the lowest possible points of the drift, while exhaust ducts are fixed in the lower part of the drift or in the middle part and are fixed to the drift wall. Exhaust hoods are in most cases connected to air ducts through nozzles. One set of ventilation system, including three air ducts, serves exclusively the face, and the other or other sets of air ducts serve drifts.

Thanks to the proposed ventilation system, the formation of a methane-air mixture is prevented and methane is quickly removed, preventing methane from entering the shaft of the mine. This makes it possible to prevent an explosion along the entire length of the shaft away from the bottomhole zone. Unlike Mine WATCH PC21 methane monitoring systems of the British company Davis Derby, the proposed ventilation system allows you to control the speed and amount of methane emitted. Also, all methane in the mine is collected, and its subsequent concentration to the required parameters for further use by industry.

Option 3: Methane emissions through a mine ventilation system are the largest proportion of total methane emissions from coal mining. About 1.5 billion cubic meters are released annually into the atmosphere. m of methane, which is the equivalent of 200 million tons of CO2. Due to the low concentration of methane in the ventilation stream (below 1% CH4), the beneficial use of ventilation gas is difficult.

The biggest problem in the world is the utilization of mine methane. Currently, the utilization of coal mine methane released through cracks and faults in the earth's crust is practically impossible due to the impossibility of their centralized collection for processing and a very low concentration of methane. Utilization of mine methane as part of ventilation emissions from mine workings is also currently not feasible due to low concentrations of methane and the lack of industrial technologies for its utilization and use. When developing new fields and drilling wells, the produced associated gas is utilized by burning. The main reason for such utilization of associated gas is the economic inappropriateness of its use, namely: low methane concentration, also produced associated gas has significant impurities in the form of moisture, gas condensate and oil, and therefore gas without additional industrial processing is unacceptable for use.

The proposed device solves the problem of mine methane utilization.

The device is illustrated in the drawing, where in Fig. 4 and Fig. 5 shows a "Device for the extraction of methane from mine air" in the context. A large volume airtight tank 20, an exhaust duct 21, an exhaust hood 22 that removes contaminated mine air without methane 9, an air duct 23 that delivers mine air from the mine containing methane 13, an injection umbrella 24 into the methane recovery tank 20, an exhaust duct 26 and exhaust hood 27, pulling clean methane 28, balloons 15 on strong threads, sensors 16, fixing the level of balloons, a line showing the level of accumulated methane 14.

The task is ensured by the fact that the "Device for extracting methane" from the mine air, including a sealed tank, of a significant volume of 20, fixed to the ceiling part are balloons 15 on strong threads, while the balls are heavier than methane, but lighter than air, at the level of the middle part and sensors 16 are installed above, fixing the level of balloons 15, at the middle part and below the duct 23 is installed, supplying mine air containing methane 13, duct 26 is installed in the upper part of the tank th air enriched in methane, and in the lower part of the tank 20 there is an air duct 21 pumping mine air without methane 9, but including heavy fractions.

Sealed tank 20 of significant volume is in the form of a cube, or a trihedral prism, or a tetrahedral prism, or a polyhedral prism, or a trihedral pyramid, or a tetrahedral pyramid, or a polyhedral pyramid, or a cone, or cylinder, or the combined listed forms.

The device operates as follows: Mine air 13 containing methane enters through the duct 23, while the area of the air supply umbrella 24 is much larger than the cross section of the duct 23. Pure methane or (mine air enriched in methane) 28 due to its light specific gravity is collected in the upper part of the tank 20. An air duct 26 is installed in the ceiling of the tank 20, pumping mine air enriched in methane 28, while the area of the pumping methane umbrella 27 is much larger than the cross-section of the pumping duct 26. An air duct 21 is installed in the lower part of the tank 20, pumping mine air, including heavy fractions 9, while the area of the air pumping umbrella 22 is much larger than the cross-section of the pumping duct 21, preventing air flows inside the tank 20. In a separate embodiment, to prevent air the number of outlet pipes of the exhaust duct 21 increases within the flows inside the tank, and as a result, the total cross-sectional area of the outlet pipes significantly exceeds the cross-sections the supply duct 21. It is also to prevent air currents inside the tank increases the amount of the supply duct outlet fittings 23, and as a result the total area of cross sections of outlet connections considerably exceeds the cross section of the supply duct. Also increases the number of outlet pipes of the exhaust duct 26, and as a result, the total cross-sectional area of the exhaust pipes significantly exceeds the cross-section of the exhaust duct. Umbrellas can surround the tank 20 internally around the circumference, in order to increase the area of the umbrellas and thereby prevent the occurrence of air currents inside the tank 20.

New materials and accessories can improve the design and functionality. An effective material is a perforated duct. For example, in the lower part of the tank 20, an air duct 21 is installed, pumping mine air, including heavy fractions 9, while mine air without methane 9 is pumped out of the tank through a perforated air duct 29. The air duct 23 supplying mine air 13 containing methane has expansion in the form of a perforated duct 30 (Fig. 5), in which the total area of the perforated material significantly exceeds the cross section of the supply pipe 23. An air duct 26 is installed in the upper part of the tank 20, pumping methane 28, while m methane 28 is pumped out of the tank through the perforated duct 31. In this case, the perforated duct 30 is rigid, for example metal, or soft, for example fabric, and the perforated ducts 29 and 31 are necessarily rigid, for example plastic or metal.

Perforated ducts are needed to prevent the occurrence of air currents inside the tank so that different fractions of the mine air do not mix. All ducts are made of ordinary solid metal and / or perforated material, i.e. combined. Then, the extracted mine air enriched in methane 28 enters the refinery, where, in accordance with the technical requirements, it is dehydrated, filtered, compressed, and then supplied to consumers by the high pressure gas pipeline. A methane recovery unit is used to generate electricity and, in addition, to produce thermal energy when using gas as fuel. The use of mine methane can improve the safety of mining operations.

Unlike currently used means of combating natural explosions in coal mines, this device gives control over the amount and speed of incoming methane. The collection of all methane in the mine, and its subsequent concentration to the required parameters for further use by industry.

Terms used in the description and bibliographic data:

Face

Mining face - the surface of a mineral (coal seam or ore body), from which the extracted mineral is separated for its further transportation to the surface.

Treatment faces are distinguished in form:

- straightforward and - concessional;

Found on the Internet URL: http://en.wikipedia.org/wiki/%D0%97%D0%B0%D0%B1%D0%BE%D0%B9

STRACK

- horizontal underground mining that does not have direct access to the day surface. Passes from other workings when the ore body is inclined along the strike of the river base, and when horizontal - in any direction. Sh., Traversed by empty p., Is called field.

Geological dictionary: in 2 volumes. - M .: Subsoil. Edited by K.N. Paffengoltz et al., 1978.

The ventilation system is single. The method of ventilation is injection. A fresh stream of air is supplied to the mine by a VOD-21 fan through the ventilation channel to the track shaft, and exhaust through a conveyor, diagonal and ventilation shafts. The type of the main fan (working and standby) is VOD-21, the actual flow rate is 80 m3 / sec, the maximum flow rate is -93.3 m3 / sec, the impeller speed is 750 rpm, the blade angle is -20 -45 degrees, the pressure developed by the fan is 85.12 mm of water. Art. VOD-21 - reversible fan.

Found on the Internet URL: http://www.abegg.ru/1248

MINERAL AIR - atmospheric air that has changed its chemical composition, temperature and humidity when moving along mine workings of a mine. The mine air is affected by gas emissions from the rock mass, toxic gases and dust during blasting, etc.

Mine air is a mixture of gases and vapors filling mine workings. The composition of the atmospheric air coming from the day surface to the mine undergoes changes when moving along mine workings, the ratio of oxygen and carbon dioxide changes, impurities appear ... ...

Found on the Internet URL: http://www.bibliotekar.ru/enc-Tehnika-3/79.htm

MINERAL GAS, in the coal industry - flammable and explosive gas contained in coal seams. It consists mainly of methane (natural gas, CH ₄ ), but it also contains a certain amount of hydrogen, oxygen and carbon dioxide, and sometimes ethane. Mine gas is the cause of many catastrophic mine explosions. Mine gas can be detected with a Davy lamp (named after Humphrey Davy), whose flame lengthens when gas is present.

Scientific and technical encyclopedic dictionary.

Slaughter - Lava Working sections of the mine, where minerals are separated from the reservoir, are called mining faces or lavas. Various mining machines work in the faces - mining combines, plows, logging machines. Minerals are transported in mines using conveyors or in trolleys by mine electric locomotives.

Found on the Internet URL: http://www.bibliotekar.ru/enc-Tehnika-3/79.htm

Methane is a flammable gas without color, odor and taste, lighter than air (density 0.524). It is released during the decomposition of organic substances without oxygen. Especially large emissions are observed in coal mines, smaller ones in potash mines. A mixture of methane with air ignites at a temperature of about 600 ° C. When it is concentrated in air, up to 5% burns with a blue flame, at a concentration of 5-16% it explodes, at a higher concentration due to a lack of oxygen it does not burn and does not explode. When methane explodes, a lot of energy is released, the temperature reaches 2500 ° C, the resulting shock air wave causes great damage to the workings. The maximum permissible concentration of methane in the jet emanating from the faces is 1%, and in the mine shaft effluent 0.75%. Methane is slightly toxic, but with a high content it displaces oxygen.

Found on the Internet URL: http://gornoedelo.narod.ru/Delo/5.htm

Ducts (perforated) - Fabric (textile)

For the first time, technology for a tissue-based air distribution system was proposed in Denmark over 20 years ago. This technology replaces traditional metal air pipelines with textile analogues of various sections. The main sizes: 315, 400, 500, 630, 710, 800, 900, 1000, 1120, 1250, 1400, 1600 mm.

Uniform air distribution

Thanks to the mesh inserts sewn along the entire length of our textile ducts, a uniform air supply is provided to the room. Even at high power.

Found on the Internet URL: http://vecotech.com.ua/pritochnie-kameri-monoblochnie-polupromishlennie/383-2010-11-29-00-47-52.html

A geometric body is a part of space that is bounded on all sides. If the surface bounding the body consists of planes, then the body is called a polyhedron. These planes intersect in straight lines, called. ribs, and form the faces of the body. Each of the faces is a polygon, the sides of which are the edges of the polyhedron; the vertices of this polygon are called Vertices.

Ball, cone, tetrahedron, cube, cylinder, parallelepiped, pyramid.

Found on the Internet URL: https://sites.google.com/site/klassifikacii/obemnye-figury

Claims (7)

1. The ventilation system of the coal mine, which includes at least three ducts, clean air enters through one discharge duct installed at the level of human growth, while the area of the injection umbrella significantly exceeds the cross-section of the duct through the second duct connected to the extraction device methane from mine air, mine air containing concentrated methane is removed, while the area of the exhaust hood is much larger than the duct section, and it is set to the maximum At high points of the drift, contaminated mine air, including heavy fractions, is removed through the third duct, and the exhaust hood area is much larger than the duct cross section and installed at the lowest possible drift locations, while the ducts extend from the working face to the ground, along the entire length of the mine working transverse to the longitudinal direction, gas-tight partitions are installed in the ceiling part, balloons filled with non-combustibles are attached to the ceiling of the drift gas, wherein the balloons are heavier than methane, but lighter than air, at the bottom of gas-tight partition mounted sensors, locking height level balloons, with the possibility of transmission of commands for increasing or decreasing the drawing speed mine air containing methane and discharge clean air. 2. The ventilation system of the coal mine according to claim 1, characterized in that the discharge ducts are attached to the drift wall at the bottom of the drift or the middle part along the entire length of the mine, and the discharge umbrellas are installed after 3-5 meters or more. 3. The ventilation system of the coal mine according to claim 1, characterized in that the gas-tight partitions are installed with the expectation that the level line of the collected methane goes from the lower point of the upper partition to the upper point of the lower partition, and exhaust hoods for mine air containing methane are installed in the highest points of each ceiling section after 3-5 and more meters, and exhaust umbrellas of mine air without methane are installed at the lowest possible points of the drift after 3-5 and more meters, while the exhaust ducts fixed at the bottom of the drift or the middle part and attached to the wall of the drift, and exhaust hoods are connected to the air ducts with pipes. 4. The ventilation system of the coal mine according to claim 1, characterized in that the ducts are made of ordinary solid metal and / or perforated material. 5. The ventilation system of the coal mine according to claim 1, characterized in that one set of the ventilation system serves solely the face, and the other or other sets of ventilation systems serve the drifts. 6. A device for extracting methane from mine air coming from the mine, including a sealed tank of significant volume, to the ceiling of which are attached balloons on strong threads filled with non-combustible gas, while the balls are heavier than methane, but lighter than air, at the level of the middle part and above installed sensors that fix the level of the location of balloons, with the ability to transmit commands to increase or decrease the speed of extraction of methane / air enriched in methane, and forcing mine air, e at the level of the middle part and below the duct is installed, supplying mine air coming from the mine and containing a large amount of methane, while the area of the mine supplying air is much larger than the cross section of the duct, the duct is installed in the upper part of the tank, pumping clean methane / air enriched with methane, while the area of the exhaust umbrella is much larger than the cross section of the pumping duct, and in the lower part of the tank there is a duct pumping mine air without methane, but containing , Including heavier fractions, the area of the umbrella pumpout air significantly exceeds the duct section. 7. A device for extracting methane from mine air according to claim 6, characterized in that the sealed tank of significant volume is in the form of a cube, or a trihedral prism, or a tetrahedral prism, or a polyhedral prism, or a trihedral pyramid, or a tetrahedral pyramid, or a polyhedral pyramid, or cone, or cylinder, or the combined listed forms.

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