RU2455491C1 - Method by professor kariman for recovery of methane from developed coal beds by production of coal in large blocks and their grinding in grinding chamber - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: method includes installation of gas discharge pipes along general shaft ventilation lines and suction of methane from an insulated grinding chamber. Large coal blocks are ground in a grinding chamber upon their delivery there from lava. When coal blocks are damaged, the main quantity of methane contained in them is released and accumulated in a gas-accumulating cavity of a grinding chamber. From this cavity methane is sucked along a gas discharge pipeline to the surface for recycling. The grinding chamber is installed outside the borders of movement of a fresh air jet sent to ventilate second working.

EFFECT: higher efficiency of a developed bed by methane.

2 cl, 10 dwg

Description

The main content of the invention

There is a method of extracting methane from developed coal seams by drilling degassing wells into the developed seam in front of a moving face and suctioning methane from the wells and transporting it to the surface through a degassing gas pipeline [1], [2], [3]. Closest to the proposed method is a method of degassing a developed formation by cutting with gigabit abrasive jets in the bottomhole array of cracks along the entire length of the lava, parallel to the planes of the formation and perpendicular to its plane [4].

Through these slots, methane is sucked from the bottomhole massif and directed into the degassing gas pipelines laid along the mine workings adjacent to the lava.

The disadvantage of all known methods for the extraction of methane from developed formations, which are based on their degassing, is the low level of methane extraction, which in most cases is 5-16% and only in very rare cases 25%. The reason is that the bulk of methane in the coal seam is contained in its micropores, from which it is released only when it is destroyed. By degassing the formation, a small portion of methane located in large pores can be extracted. The share of this methane is insignificant of the total amount contained in the coal seam. The main part of methane is released when it is destroyed by the screws of the combine in the area of coal extraction from the massif and its subsequent transportation by conveyors along the lava and adjacent transport mine. All this methane passes through the near-mine zone and enters the outgoing methane-air stream of lava, forming explosive concentrations of methane in them during intensive coal mining. Therefore, the existing method for the extraction of methane from the developed formations for both disposal and to ensure the safety of treatment works is not effective.

The purpose and idea of a new method for methane production and ensuring the safety of gas treatment

The purpose of the proposed method for the extraction of methane from the developed reservoir is to sharply increase the share of the extracted amount of methane, in bringing this share to 80% of the natural gas content of the formation. This allows, on the one hand, to ensure high safety of gas treatment works. On the other hand, the national economy of the coal regions will receive a powerful source of energy. So, a mine developing gas-bearing formations with a natural gas content of 25 m ³ CH ₄ / t typical for the conditions of the South Kuzbass and having an annual productivity of 3 million tons / year will produce associated gas methane per year in the amount of 25 m ³ CH ₄ / t × 0.8 × 3 million tons / year = 60 million m. ³ CH ₄ / year.

However, the proposed new method due to the application of new technology for coal mining in large blocks allows at the same time to increase the mine productivity by 4 times, bringing it to 12 million tons / year.

Therefore, the amount of methane produced per year will be

25 m ³ CH ₄ / t × 0.8 × 12 million t / year = 240 million m ³ CH ₄ / year.

The idea of a new methane extraction method is to transfer the place of destruction of the coal mass during mining from lava to a special crushing chamber located outside the movement of a fresh stream of air coming in to ventilate the treatment works. The extraction of coal in the lava is carried out as large blocks as possible from the conditions of its extraction and transportation to the crushing chamber, where the coal blocks are grinded into loose coal and its subsequent transportation to the carbohydrate shaft.

Since the bulk of the methane contained in coal is released during its destruction, by destroying the coal blocks in an isolated crushing chamber in fine-grained alluvial coal, it is possible to ensure that the amount of methane remaining in the coal does not exceed 10% of its initial natural gas content. Then all the methane released during the destruction of coal due to the fact that it is lighter than air, will rise up into the gas outlet in the crushing chamber and from there it will inevitably fall into the gas exhaust pipe, through which it will be sent to the surface for disposal.

When coal is mined in the lava and transported to the crushing chamber with as large blocks as possible with side sizes of 2 ÷ 3 m, the amount of methane that will have time to separate from it is insignificant due to the size of the blocks and will not exceed 10% of the natural gas content of coal. Therefore, the amount of methane utilized in this method is 80% of its natural gas content, which is obtained after subtracting from 100% of the residual gas content of coal coming from the crushing chamber, and 10% of methane released in the lava and in the transport output.

The composition of production processes

According to the submitted application, a new method for methane extraction from the developed reservoir consists in the parallel execution of technological processes:

- creating in the lava of the lower submersible by means of the plow installation as part of the plow, scraper conveyor, Sputnik hydroficated roof support with hydraulic gear; with the movement of the face of the explosions to the width of the plate conveyor;

- loading of alluvial coal discharged from the lower blasting from the work of the plow into wagons with bottom unloading of the VD or VDK type; by their hauling and unloading into a mountain bunker with the subsequent delivery of coal to a prefabricated transport line;

- moving the plate conveyor into the space of the lower demolition; together with a plate conveyor in a new position to the chest of the main face moves mechanized support together with a cutting unit and a hydraulic cutting machine;

- cutting the bottom hole massif with the cutting unit along the entire length of the lava with its lowering onto the plate conveyor located under it by cutting the vertical and upper along the boundary of the layer - roofing cracks by the cutting bars;

- cutting through transverse cracks with ultra-high pressure water jets on the cut-out thickness of the bottom-hole massif in the lower part of the lava with the plate conveyor operation left;

- the work of the plate conveyor to move the cut-out bottomhole array lying on its load-bearing plates to the lower part of the lava for cutting through the transverse cracks;

- the work of the plate conveyor and reloading platform for reloading the cut blocks of fossil from the plate conveyor to transport platforms located on the transport output;

- transportation of coal blocks issued from the lava along the transport mine adjacent to the lava using transport platforms and electric locomotives to the chamber where the coal blocks are grinded into placer coal;

- suction of methane released in the crushing chamber from the destruction of coal blocks and from the hopper, and issuing it to the surface through a special gas pipeline laid through the ventilation path, and the main ventilation opening to the mine ventilation shaft or pit.

The composition of the drawings explaining the essence of the new method

The invention is illustrated by means of drawings, each of which shows the following.

Figure 1. The layout of the location of the crushing chamber and methane gas discharge points and unloading points of transport platforms with coal blocks and trolleys with bottom discharge of loose coal into a mining bunker, followed by unloading of alluvial coal from both chambers onto a conveyor belt; 1 - transport platform with a coal block at the unloading point; 2 - winch for moving the coal block into the crushing chamber; 3 - crushing chamber; 4 - crushing machine with executive tools in the form of breaker rods; 5 - gas outlet cavity in the chamber; 6 - methane gas outlet pipe to the surface; 7 - freight trolley with bottom discharge of bulk coal; 8 - mountain bunker for alluvial coal; 9 - belt conveyor.

Figure 2. The technological scheme of treatment works with coal mining in lava in large blocks using a cutting unit, a plate conveyor of a stationary hydraulic cutting unit using lower blasting using electric locomotive haulage of transport platforms with coal blocks to the crushing chamber; 1 - transport platform with a coal block; 2 - winch; 3 - crushing chamber; 6 - methane gas outlet pipe to the surface; 7 - freight trolley with bottom unloading of placer coal; 8 - mountain bunker; 10 - field conveyor slope; 11 - 2-way reservoir haulage drift with electric locomotive haulage; 12 - lava loading point with loading of alluvial coal from the operation of the plow installation in the lower demolition; 13 - plow installation; 14 - lower subversion; 15 - lava loading point with loading coal blocks onto transport platforms; 16 - cutting unit; 17 - plate conveyor; 18 - hydraulic cutting installation; 19 - pumping stations of the hydraulic cutting installation.

Figure 3. The cross section of a 2-way retractable floor formation drift; 20 is a contour of a transport platform with a coal block, a sectional view; 21 - contour of a freight car with bottom unloading type VD 5.6 m.

Figure 4. Lava loading point; loading of coal blocks onto transport platforms and loading of loose coal using a reloader in trolleys with bottom two-sided unloading; plan view; 12 - lava loading point for loading alluvial coal from the lower blast; 22 - placer coal reloader in the structure of mine cargo trolleys with bottom unloading; 23 - transport platforms for the transportation of coal blocks; 24 - coal block; 25 - reloading platform; 26 - issued head plate conveyor; 27 - conveyor drive station.

Figure 5. Reloading of coal blocks from a lava plate conveyor to a transport platform using a reloading platform; 23 - transport platform for transporting coal blocks; 24 - coal block; 28 - the bottom of the reloading platform with a mechanized extension; 29 - the body of the reloading platform; 30 - rollers reloading platform; 31 - load-bearing plate of a plate conveyor; 32 - a bypass drum of the dispensing head of the conveyor; 33 - hydraulic gear; 34 - stopper.

Figure 6. Plate conveyor, top view; 26 - issued head; 27 - drive station; 31 - load-bearing plates; 35 - rollers; 36 - traction chain.

Figure 7. Plate conveyor, cross section; 31 - load-bearing plates; 37 - axis roller support; 38 - videos; 39 - eyes; 40 - supporting channel; 41 - supporting transverse plate; 42 - roller bearings.

Figure 8. Arrangement of treatment equipment, a cross section along the length of the lava; 14 - lower subversion; 16 - cutting unit; 17 - plate conveyor; 43 - plow; 44 - scraper conveyor; 45 - hydraulic jack conveyor; 46 - support "Sputnik"; 47 - back vertical slit; 48 - upper slit; 49 - cutting bar back slit; 50 - cutting bar of the upper gap; 51 - shaft transmitting rotation from the cutting part to the bar of the upper slot; 53 - mobile clips supporting the shaft of the transmission of rotation to the bar of the back slit; 54 - cable layer; 55 - channel guides.

Figure 9. Cutting the transverse slots with a hydraulic cutting machine “GROM”, view in profile; 14 - lower subversion; 17 - plate conveyor; 46 - support "Sputnik"; 54 - cable manager; 55 - cut through the transverse gap; 57 - a coal body cut from a bottomhole array, cut by transverse slots into individual blocks; 58 - waterjet cutting jet; 59 - waterjet cutting head; 60 - metal tube for supplying ultra-high pressure water (SVD) to the cutting head; 62 - feed hopper for abrasive; 63 - vertical metal tube for supplying water SVD to the cutting head; 64 - horizontal displacement of the executive tool; 65 - water supply line SVD; 66 - vertical actuator movement guides.

Figure 10. Cutting the transverse slots with a hydraulic cutting machine “GROM”, top view; 59 - waterjet cutting head; 60 - metal tube water supply SVD to the cutting head; 61 - flexible tube for feeding the abrasive to the cutting head; 62 - feed hopper for abrasive; 63 - vertical metal tube for supplying water SVD; 64 - horizontal displacement of the executive tool; 65 - water supply line SVD; 67 - site placement of the water supply line SVD.

Coal Methane Extraction in a Crushing Chamber

After the arrival of the composition of transport platforms with coal blocks 1 (see Figure 1), their unloading begins in the receiving window of the crushing chamber. Unloading is carried out using a winch by moving the coal block from the surface of the platform to the right under the action of the traction plate, which is under tension from the working rope of the winch 2. Unloaded coal blocks sliding on the steeply inclined surface 3 of the crushing chamber fall under the action of the upper and lower breaker rods 4, of the crushing machine . The breaker rods 4, rotating under the action of their drive, grind the coal blocks into fine lump coal, which ensures maximum extraction of methane from coal.

Due to the fact that it is lighter than air, methane released from coal rises and concentrates in the gas exhaust plane 5, from where it is sucked into the gas exhaust pipe 6, in which a vacuum is created due to the installations operating on the surface. Methane is also sucked out from a mountain bunker 8, where methane is also accumulated from alluvial coal, which is poured out there from mine freight trolleys 7 with bottom discharge.

The gas exhaust pipe is laid along the inclined ventilation walker 6, passed through the reservoir and designed to issue an outgoing ventilation stream from airing of treatment and mining and preparatory work.

Alluvial coal coming from the crushing chamber and from the mountain hopper enters the conveyor belt 9 mounted on the field conveyor slope and moves along the system of mine main conveyors to the skip shaft for delivery to the surface.

The technological scheme of treatment works with the extraction of coal in the lava in large blocks and the effective extraction of methane in the crushing chamber

Presented in FIG. 2, a flow chart of treatment operations with large blocks of coal in the lava and their transportation by locomotive transport to the crushing chamber allows to obtain a powerful and stationary source of methane for utilization, on the one hand, and to ensure the safety of treatment operations by gas factor, with the other side.

According to the presented technological scheme, the cleaning operations in the lava are carried out ahead of the main face by the bottom of the lower blasting 14, as shown in Fig. 8.

The extraction of coal in the bottom of the lower blasting is carried out by the plow unit 13. The coal is delivered from the work of the plow by a scraper conveyor. The delivered alluvial coal at loading point 12 is discharged to a reloader, as shown in FIG. 4. Alluvial coal from the reloader enters the mine freight trolleys with bottom discharge. After the composition is fully loaded, the latter, with the help of an electric locomotive, moves to the unloading point 7, where alluvial coal is unloaded into the mining bunker 8, as shown in Fig. 1. Subsequently, this coal is unloaded from the mountain bunker onto a conveyor belt 9 (FIG. 1) installed in a field conveyor slope 10 (see FIG. 2).

After moving the bottom face of the lower demolition in the direction of lava movement by a distance of the width of the plate conveyor 17, the plate conveyor slides into the cavity created along the entire length of the lava, as shown in Fig. 8.

Together with the conveyor, the rest of the lava treatment equipment is moved: the cutting unit 16 together with its channel guides, the hydraulic cutting cleaning machine 18 together with the pumping stations 19 that support it, mechanized roof support and equipment of the loading point 15.

After the end of the movement of the treatment equipment, the cutting unit begins to cut longitudinal slits along the entire length of the lava: the back vertical and upper along the boundary with the formation roof (see Fig. 8). The depth of cut of the slots corresponds to the width of the plate conveyor. As a result of cutting through the cracks, the cut-off part of the bottom-hole coal mass lies on becoming a plate conveyor.

After the cutting unit leaves the lower part of the lava, the cutting of transverse slots begins in the cut out part of the bottomhole massif located in the lower part of the lava. The cutting of the transverse slots is carried out by hydroabrasive jets of a hydraulic cutting machine (see Fig. 9). Six slots are cut at the same time (see Figure 10), which ensures the simultaneous receipt of 6 coal blocks ready for unloading on a transport drift.

A fresh stream for airing the cleaning works enters through a mechanized walker and a stop at the haul-off drift 11, and then into the lava. The outgoing ventilation stream from the lava enters the ventilation drift of the lava, then through crossing goes to the inclined ventilation walker.

Loading and locomotive hauling of coal blocks

Unloading of coal blocks is carried out at loading point 15 (see Figure 2), as shown in Figures 4 and 5. The coal blocks loaded on transport platforms are transported along a 2-way recoil transport excavation (see Figure 3) to the unloading point 1 (see Figure 2) at the crushing chamber 3.

After leaving the laden composition with coal blocks from under the lava, a flipper, which was previously in reserve on the 2nd track, is fed under loading.

Figure 3 presents a cross section of a floor haul-off 2-track drift, which serves to transport the mined coal in the form of large blocks on transport platforms such as PTS, moving along a track of 900 m using electric locomotives of type 28 ARP. To ensure the same traction condition of the electric locomotive during the movement of a loaded or empty train, the haul-off drift is carried out with a slight bias towards the prefabricated transport lines. The 28 ARP electric locomotive has a coupling weight of 28 tf, traction engine power of 104 kW, and a traction force of 3420 kgf, which enables locomotive hauling of trains with coal blocks weighing up to 15 t.

The transport platforms of the PTS type used for transporting coal blocks have a significant carrying capacity and consist of two 4-wheeled trolleys with a total length of 2750 mm and a width of 1600 mm.

5.6 m used for transporting alluvial coal from carrying out lower blasting to mine cargo trolleys with bottom 2-sided unloading of type 13D 5.6 m have a body capacity of 5.6 m ³ , a rigid base of 1500 mm, a length of 4900 mm, a width of 1350 mm and a weight of 2600 kg .

Used for haulage of goods 2-way recoil drift has a clear cross section of 17.1 m ² , clear dimensions: height - 2960 mm, width across the soil - 5760 mm.

Dimensions in width: transport platform - 1600 mm, trolleys with loose coal - 1350 mm, the distance between rolling stocks - 250 mm.

Distance to the working walls: from the platform side - 1025 mm, from the side of the trolley - 775 mm.

Figure 4 presents the position of the loading points of the lava for loading coal 12 and coal blocks 26. The loading of alluvial coal coming from the plow installation in the lower blasting into mine cargo trolleys is carried out using a reloader 22, under which the train with empty trolleys is driven.

The loading of coal blocks on transport platforms 23 is performed using the dispensing head 26 of the plate conveyor and the reloading platform 25.

Figure 5 shows the technology of reloading the coal block 24 from the web of the plate conveyor to the transport platform. The load-bearing plates 31, moving the coal block 24 when approaching the by-pass block 32 of the dispensing head and turning around it, push the coal block 24 on the bottom of the reloading platform 28. The reloading platform consists of a body 29 and a mechanically extendable bottom 28. The coal block is forced by the next coal unit, completely slides into the body of the reloading platform. Then a mechanized extension of the bottom is made in the direction opposite to the movement of the train, and the coal block is lowered onto the transport platform. After loading the coal block, the platform is removed from the stoppers 34 and using the hydraulic gear 33 the loaded platform is moved, and its place is empty.

Lava treatment

FIG. 6 is a plan view of a plate conveyor used in a lava for issuing coal blocks, and FIG. 7 is a cross section thereof. The plate conveyor includes linear and transition sections, dispensing and tensioning heads. The dispensing head 26 has a bypass block 32 (Figure 5) and two electric drives 27. The coal blocks are transported on load-bearing plates 31, which, when moving, are supported by their eyes 39 on an axis with rollers 38 rolling along the bottoms of the pans located on the supporting transverse plate 41. Therefore, the weight of the heavy coal blocks is transmitted through the load-bearing plates, eyes, axles and rollers to the supporting transverse plate 41 and the supporting channel 40.

All plates 31 are connected on both sides with traction chains 36, which gives them stability in the transverse direction and protects them from turning. The plates are also lapped together. The traction chains are supported by rollers 35 during movement. The traction chains are driven by the rotation of the sprockets with which the bypass drums of the dispensing and tensioning conveyor heads are equipped.

On Fig presents the arrangement of the main treatment equipment in the lava. The plow installation, which provides for the lower demolition 14, includes: plow 43, a special scraper conveyor 44 with attachments, upper and lower drive stations, support brackets, hydraulic gears 45, electrical equipment and drift gear.

The Sputnik 46 hydroficated roof support is designed to fasten the roof in the lower demolition and to mechanize the movement of a special conveyor operating as part of a plow installation. The Sputnik support consists of sections, each of which includes a hydraulic screw landing strut 46 and a two-way hydraulic jack for moving.

The cutting unit 16 is intended for cutting longitudinal slits along the entire length of the lava: the rear vertical 47 and the upper parallel plane of the formation, drawn along the boundary with its roof 48. The cutting unit moves when cutting through the bottom from the top of the lava along channel channels 55 laid on the soil. The cutting unit consists of from a wheel platform, a power supply with an electric drive, an electric drive with an external cutting bar 49 for cutting the rear vertical slot 47 and an electric drive with an external cutting baro Recessing the upper slit 50 and elektroraspredustroystva receiving AC supply by electric cable, located in the trucking chain cable layer 54 sandwiched lava along with the goaf side of the guide unit cuttings.

In the initial position, the cutting unit is located in the zone of the interface between the lava and the working mine, and its cutting bars are in the working position and partially protrude into the working space.

The mining cycle begins with the movement of the cutting unit up the length of the lava. The movement of the cutting unit is made without stops, regardless of whether the plate conveyor is working or not. As a result of the operation of the unit, as it moves upward from the bottom-hole array, the corresponding part is separated and lowered onto the conveyor.

After the cutting unit exits the lower part of the lava and lowering the cut-out part of the bottomhole mass to the plate conveyor, free space is created between the bottom of the bottom-hole space and the cut-out bottom-hole massif. In this space, at its entire depth, equal to the width of the plate conveyor, the executive tool of the hydraulic cutting cleaning machine is slid. In the process of entering the interior of the space with waterjet jets 58 (see FIG. 9), the transverse slots are cut in the upper part 56, separated from the rest of the array of its bottom-hole part.

Hydroabrasive jets flow out of the waterjet cutting heads 59, to which ultra-high pressure water (SVD) 50 and abrasive sand 61 are supplied through separate pipes. The abrasive sand is sucked into the cutting head 59 from the abrasive feed hopper 62. Moving the Executive hydraulic cutting tool deep into the open bottom hole along horizontal guides 64. Water of ultrahigh pressure (up to 300 MPa) is supplied to the executive tool along line 65.

At the same time, 6 transverse slots are cut (see FIG. 10), which ensures high performance of transverse hydraulic cutting and, accordingly, high performance of cutting coal blocks.

Extra-high pressure water is supplied to the line from the hydraulic booster located nearby. In the hydraulic booster, water conducted from an external source is subjected to ultra-high compression due to the energy of the emulsion supplied from the system of pumping stations of the energy train, located within 10-15 m from the lava window. The spent emulsion is returned back to the pumping stations. The main structural elements of the hydraulic booster are hydraulic multipliers, in which water is compressed to a level of 300-400 MPa and pulses are sent to the receiver, where the pressure pulses are smoothed out and a high-power SVD water stream with smoothed ultra-high pressure is delivered to the highway.

Cut coal blocks by the operation of a plate conveyor are given to a lava loading point, where they are loaded into a transport platform using a loading platform.

Mining capacity in coal mining in large blocks

Due to the fact that the size of the extracted blocks of the fossil is 2.4 m in the direction of lava movement, each lava cycle moves by 2.4 m, which is four times more than the usual 0.6 m - the width of the combine harvester. Therefore, the production volume per cycle is 4 times greater than with combine lavas. So, in a 200 m long lava during the development of a 3 m layer, production per cycle of movement is

3 m × 1.4 t / m ³ × 2.4 m × 200 m = 2016 t.

The performance of the working face also depends on the number of cycles per day. Production time per day is 18 hours (three shifts of six hours). Therefore, the number of possible cycles per day is determined by the duration of one cycle, the duration of the cycle is determined by the longest of two durations: the time of plow face moving up to 2.4 m and the time of cutting fossil blocks along the entire length of the lava and their delivery from the face.

Focusing on the use of plow installations of Russian production of types СО or СН, the possible chip thickness and speed of movement of the plow are taken according to their technical characteristics: chip thickness of 7 cm, and the speed of 1.89 m / s.

Then the number of chips necessary for moving the face to 2.4 m is

2.4 m: 0.07 m = 34.

Duration of removal of one chip

200 m: 1.89 m / s = 106 s = 1.76 min.

Then the duration of the removal of 34 shavings and the movement of the plow face 2.4 m is

1.76 min × 34 = 59.8 min.

The cutting time longitudinal along the length of the lava of the rear vertical and upper cracks along the boundary of the roof is determined by the working speed of the cutting unit. According to the technical characteristics of the feed part of the cutting unit, the latter at a speed of 6.7 m / min provides traction up to 15.6 tf. The cutting parts of both bars have their own electric motors. In addition, the cutting of both slits is made in a well-wrung area. Therefore, the actual resistance of the array to cutting will be incomparably less than 15.7 ton-force. Therefore, it is not an exaggeration to consider the possibility of cutting the unit in calculating its working speed of 6 m / min.

Then the cutting time of both longitudinal slots is: 200 m: 6 m / min = 33 min.

The cutting speed of the transverse slit in the fossil array located on the plate conveyor stand opposite the transverse hydraulic cutting executive tool is estimated at 5 cm / sec. In this case, cutting is carried out by a hydroabrasive jet with a water flow rate of SVD 10 l / min and a pressure of 300 MPa. In this case, based on experimental data, the depth of cut of the array will be up to 1.2 m in one pass. Therefore, for complete cutting through the gap, two passes are necessary: direct and reverse. Their execution time is equal (at a cutting speed of 5 cm / sec)

2 × 240 cm: 5 cm / s = 96 s = 1.5 min.

In order to increase the productivity of transverse hydraulic cutting, 6 transverse slots are simultaneously cut through the action of 6 hydraulic cutting units.

After the cutting of the transverse slots is completed and the hydraulic cutting heads are pulled out, the plate conveyor is put into operation and the cut 6 blocks are moved and loaded onto transport platforms, and the next portion of the fossil body takes the place on the conveyor opposite the transverse cutting tool to cut the following from it blocks.

The duration of unloading of each block is determined by the loading time of the block in the body of the loading platform equal to

1.6 m: 0.25 m / s = 6.4 s,

where 1.6 m is the width of the block, m;

0.25 m / s - the velocity of the load-bearing plates,

and the platform body unloading time equal to 2.4 m: 0.5 m / s = 4.8 s,

where 2,4 is the length of the block;

0.5 m / s - the movement speed of the transport platform during the release of the body.

So, the unloading time of one block is 6.4 + 4.8 = 11.2 seconds.

Then the unloading time of 6 blocks is 11.2 × 6 = 67.25 sec = 1.2 min.

Then the total cutting time of 6 blocks and their unloading

1.5 min + 1.12 min = 2.62 min.

Then the total time of cross cutting and unloading of blocks from the plate conveyor is

the remaining 60 minutes - 53.7 minutes = 6.3 minutes are spent on moving the powered roof support, escalator and reloading platform to the position before the start of a new cycle.

Thus, the total duration of the production cycle is 1 hour. Therefore, during working hours per day, 18 cycles are performed - one per hour.

The total capacity of the treatment plant is

2016 t × 18 = 36308 t / day.

This value on average exceeds the existing productivity by 4 times.

The volume of methane production from a coal seam during the operation of one face

Let us determine the annual methane production by the example of a mine developing a single shallow coal seam with a capacity of 3 m and a gas content of 25 m ³ / t, which is typical for mines in the Southern Kuzbass. Assuming that the mine has one working face in operation with a capacity of 36 thousand tons of coal per day and at the same time utilizes 80% of the methane in the produced coal, we get

At 300 days of production per year, the annual production of methane due to the work of one face will be

720 thousand m ³ × 300 = 316,000 thousand m ³ = 216 million m ³ CH ₄ / year

Information sources

1. Guidelines for the degassing of coal mines. M., 1990

2. Equipment and apparatus for degassing operations in mines. Catalog. Moscow, Central Scientific Research Institute of Engineering and Coal Engineering, 1989

3. Management of gas emission in coal mines during the treatment works. M., Nedra, 1992

4. Patent for invention No. 2183276 "Method for the degassing of the bottom-hole zone of a coal seam. It is registered in the State Register of Inventions of the Russian Federation on June 10, 2002.

Claims (2)

1. A method of extracting methane from a coal seam being developed, comprising laying gas pipes through a mine shaft ventilation mine workings, characterized in that the methane is sucked out of an isolated crushing chamber, where large coal blocks delivered there from the lava are destroyed. 2. The method according to claim 1, characterized in that the crushing chamber is installed outside the movement of a fresh stream of air directed to ventilate the treatment work.

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