CN109403948B - Metering method for jet flow punching coal yield and coal collecting device - Google Patents
Metering method for jet flow punching coal yield and coal collecting device Download PDFInfo
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- CN109403948B CN109403948B CN201811246436.3A CN201811246436A CN109403948B CN 109403948 B CN109403948 B CN 109403948B CN 201811246436 A CN201811246436 A CN 201811246436A CN 109403948 B CN109403948 B CN 109403948B
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- 239000003245 coal Substances 0.000 title claims abstract description 242
- 238000004080 punching Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 72
- 238000001914 filtration Methods 0.000 claims abstract description 53
- 238000000926 separation method Methods 0.000 claims abstract description 53
- 238000003860 storage Methods 0.000 claims abstract description 42
- 238000000605 extraction Methods 0.000 claims abstract description 35
- 238000005553 drilling Methods 0.000 claims abstract description 23
- 230000002265 prevention Effects 0.000 claims abstract description 19
- 239000000839 emulsion Substances 0.000 claims abstract description 13
- 239000002893 slag Substances 0.000 claims description 33
- 239000004094 surface-active agent Substances 0.000 claims description 15
- 238000007789 sealing Methods 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 7
- 239000000428 dust Substances 0.000 claims description 7
- 239000002244 precipitate Substances 0.000 claims description 4
- 239000002817 coal dust Substances 0.000 claims description 3
- 239000010865 sewage Substances 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims 1
- 238000005507 spraying Methods 0.000 claims 1
- 239000010410 layer Substances 0.000 description 34
- 238000007667 floating Methods 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 239000003818 cinder Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/34—Arrangements for separating materials produced by the well
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geophysics (AREA)
- Sampling And Sample Adjustment (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
The invention belongs to the technical field of coal mine gas disaster prevention and control, and particularly relates to a metering method of jet flow punching coal yield and a coal collecting device, wherein the coal collecting device mainly comprises a high-pressure emulsion pump, a blowout prevention sleeve, a gas-water-coal separation box, a coal storage metering cabinet and a gas extraction pipe, wherein two ends of the high-pressure emulsion pump are respectively connected with a pump station water tank and a drilling machine, the blowout prevention sleeve is fixed on the wall of a drilling hole, and the drilling machine, the gas extraction pipe and the gas-water-coal separation box are respectively connected; two layers of drawing type filtering baffle plates are arranged in the gas-water-coal separation box, and a coal storage metering cabinet is arranged at the lower part of the gas-water-coal separation box; according to a certain volume of the coal storage metering cabinet, the mass of the washed pulverized coal in unit time can be calculated by multiplying the density of the precipitated pulverized coal by the volume of the coal storage cabinet; the invention can realize the timely collection of the granular coal and the pulverized coal, improves the metering and counting precision of the coal output, shortens the time for collecting the coal sample and reduces the labor intensity.
Description
Technical Field
The invention belongs to the technical field of coal mine gas disaster prevention and control, and particularly relates to a metering method for jet flow punching coal yield and a coal collecting device.
Background
The gas accident has the characteristics of burst property and extremely strong destructive property, and once the gas accident happens, serious casualties and property loss can be caused, so that the production safety of the coal mine is threatened; with the increase of the mining depth, the gas content and the gas pressure in the coal bed are gradually increased, and more gas accidents are increasingly frequent; therefore, gas control is the primary task of the current coal mine safety work, and needs to be solved.
The regulations for preventing and controlling outburst of coal and gas require adopting two areas of protection layer mining and pre-drawing coal bed gas outburst prevention measures for the outburst coal bed; however, part of coal beds in China do not have the condition of mining protective layers, and only regional outburst prevention measures for pre-pumping coal bed gas can be adopted; the method for pre-pumping the coal seam gas comprises a plurality of methods such as ground drilling extraction, floor rock roadway layer-penetrating drilling pre-pumping coal roadway strip gas and the like; the measures of pre-extracting the gas of the coal roadway strips by the layer-penetrating drilling holes of the bottom plate rock roadway are that the layer-penetrating drilling holes are constructed in the rock roadway to extract the gas, so that the safety is high and the popularization is achieved; however, in most of outstanding coal seams with low air permeability, the gas extraction attenuation speed is high, so that the pre-extraction time is long, and serious imbalance of mine extraction, digging and extraction is caused, therefore, the low-permeability coal seam needs to be subjected to enhanced anti-reflection measures; among various anti-reflection measures, the jet flow punching measure is usually matched with the bottom plate rock roadway layer-penetrating drilling pre-pumping coal roadway strip gas, is a simple and effective anti-reflection measure, and is popularized and applied in many coal mines.
The coal output of jet punching is an important parameter for examining the punching effect; when the coal output is metered at present, a blowout preventer, a water sump or a woven bag is generally adopted to collect coal water slurry gushed out of a drilling hole, and after the punching is finished, the collected coal water slurry is manually shoveled into a mine car for metering; the method has high labor intensity, only large-particle coal bodies precipitated near a punching operation place can be collected, and a large amount of pulverized coal with a large contact angle has poor wettability, can be accumulated on the surface of water flow to form floating coal to flow away, and cannot be collected and metered; the metering method of arranging a graduated scale on the side surface of the coal storage box still cannot overcome the defect that floating coal flows away; the method for separating and spin-drying water cinder and then preparing the briquettes by utilizing the centrifugal machine has a plurality of working procedures, and the equipment occupies large operation space and is not applicable to a roadway with a smaller section; in order to overcome the defects of the jet flow punching coal yield metering method, a new device and method are needed to be sought, the metering accuracy of the coal yield is improved, the labor intensity is lightened, the jet flow punching effect is ensured, the gas extraction rate is improved, and the safety production of a coal mine is ensured.
Disclosure of Invention
The invention solves the technical problems that pulverized coal with a larger contact angle can be accumulated on the surface of water flow to form floating coal which can not be collected and metered, and the jet punching coal outlet amount metering method has various and complex procedures.
The invention adopts the technical proposal for solving the technical problems that:
the utility model provides a coal collecting device that efflux punched a hole, mainly includes high-pressure emulsion pump (5), prevents spouting sleeve pipe (9), gas-water coal separator box (16), stores up coal metering cabinet (25) and gas extraction pipe (3), the input of high-pressure emulsion pump (5) is connected pump station water tank (4), and its output passes through high-pressure water pipe (8) and connects rig (1); the blowout prevention sleeve (9) is of a three-fork pipeline structure, one end of a main pipe of the blowout prevention sleeve is fixed on the wall of a drilling hole, a high-pressure drill rod (2) is sleeved in the main pipe of the blowout prevention sleeve, the other end of the main pipe is connected with the drilling machine (1) in a sealing manner, one branch pipe is upwards connected with the gas extraction pipe (3) through a main exhaust pipe (10), and the other branch pipe is downwards connected with the gas-water-coal separation box (16) through a slag discharging hose (11); the gas-water-coal separation box (16) is connected with the auxiliary exhaust pipe (14) through the exhaust port (13) and is communicated with the gas extraction pipe (3) under the regulation action of a control valve (15) in a pipeline of the auxiliary exhaust pipe (14); the inside of the gas-water-coal separation box (16) is provided with two layers of drawing type filtering baffle plates, and the lower parts of the gas-water-coal separation box and the drawing type filtering baffle plates are provided with a coal storage metering cabinet (25).
Further, the gas-water-coal separation box (16) is a square box body, the slag inlet (12) and the exhaust port (13) are arranged on two sides of the top of the box body, and the outer diameters of the slag inlet and the exhaust port are respectively consistent with the inner diameters of the slag discharging hose (11) and the auxiliary exhaust pipe (14).
Furthermore, a baffle (17) is welded in the upper surface of the gas-water-coal separation box (16) to prevent water-coal slag from splashing.
Further, U-shaped water draining devices (18) are respectively arranged on two sides of the box body of the gas-water-coal separation box (16), so that sewage in the box body can be drained, and gas in the box body can be prevented from being drained into a roadway along with water.
Further, the height of the U-shaped water draining device (18) is larger than the negative pressure water head height of the gas extraction pipe (3), so that air is prevented from being sucked into the gas-water-coal separation box (16), and the gas extraction concentration is reduced.
Further, a sealing ball (20) made of plastic material is arranged at the pipe orifice of the U-shaped water draining device (18), and a dust cover (19) with a four-foot supporting umbrella-shaped structure is also arranged at the pipe orifice in a matched mode.
Further, the gas-water-coal separation box (16) is respectively an upper layer filtering baffle (21) and a lower layer filtering baffle (22), the surfaces of the upper layer filtering baffle and the lower layer filtering baffle are hollowed out and engraved with a plurality of rows of circular filtering holes, and the row spacing between each two filtering holes is larger than the diameter of each circular filtering hole.
Further, the upper layer filtering baffle (21) and the lower layer filtering baffle (22) are square flat plates with square protruding plates at one side, and are respectively embedded in an upper clamping groove (23) and a lower clamping groove (24) on the surface of the box body.
The metering method of the jet flow punching coal yield utilizes the jet flow punching coal collecting device, and comprises the following steps:
step one, before jet punching operation, preparing surfactant solution in a pump station water tank (4); in the jet operation process, high-pressure water containing a surfactant enters a drill hole through a high-pressure water pipe (8) to punch a coal bed for anti-reflection, and the surfactant can enable pulverized coal with a large contact angle and poor wettability punched in the drill hole to rapidly precipitate in water, so that the pulverized coal is prevented from accumulating on the upper layer of a gas-water-coal separation box to form float coal;
step two, coal dust collection is carried out, coal slag is collected by using the gas-water-coal separation box (16) in the invention, one end of the blowout prevention sleeve (9) is fixed on the wall of a drilling hole, gas gushed in the drilling hole enters the gas extraction pipe (3) to be discharged through the main exhaust pipe under the action of negative pressure, and water coal slag gushed in the drilling hole flows into the gas-water-coal separation box (16) through the slag discharging hose (11); the gas entering the box body can also flow through the auxiliary exhaust pipe (14) to enter the gas extraction pipe (3) for discharge; the gas-water-coal separation box (16) discharges coal slag through two layers of same drawing type filtering baffle plates arranged at the lower position of the middle part of the inside of the gas-water-coal separation box, and enters a coal storage metering cabinet (25) below the filtering baffle plates for collection;
step three, measuring the coal expansion amount, wherein the coal storage measuring cabinet (25) is of a regular rectangular structure, and the volume is v; after the coal storage metering cabinet is filled with pulverized coal, the density of the pulverized coal is rho, the coal storage metering cabinet filled with the pulverized coal is pulled out, the pulverized coal in the coal storage metering cabinet is poured into a mine car or a belt to be cleaned out in time, n frames of pulverized coal are poured out from the coal storage metering cabinet in a recording unit time t, the total volume V=nv of the n frames of pulverized coal is calculated, and the mass m of the pulverized coal punched in the unit time can be calculated.
Compared with the prior art, the invention has the following beneficial effects: compared with the prior art, in the jet flow punching process, high-pressure water containing a surfactant enters into a drill hole through a high-pressure water pipe to punch and enhance the permeability of a coal bed, so that pulverized coal with a large contact angle and poor wettability punched in the drill hole can be quickly deposited in water, the pulverized coal is prevented from being accumulated on the upper layer of a gas-water-coal separation box to form floating coal, water cinder flushed in the drill hole flows into the gas-water-coal separation box, and then is discharged, exhausted and filtered, and the deposited pulverized coal automatically falls into a coal storage metering cabinet through a filtering hole to be collected, so that the timely collection of granular coal and the pulverized coal can be realized, and the metering statistical precision of the coal output is improved; the coal cleaning and jet flow punching are ensured to be carried out simultaneously, when the coal storage metering cabinet is filled with the pulverized coal, the pulverized coal is pulled out for cleaning, and the mass of the punched pulverized coal in unit time is calculated according to the volume of the coal storage metering cabinet and the density of the cleaned pulverized coal, so that the time for collecting the coal sample is shortened, and the labor intensity is reduced; is beneficial to improving the gas control level of the mine and ensures the safe production of the mine.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is an overall schematic diagram of a gas-water-coal separation tank in the invention;
FIG. 3 is a schematic front view of a gas-water-coal separation tank in the invention;
FIG. 4 is a block diagram of a filter separator in accordance with the present invention;
in the figure, 1 is a drilling machine; 2 is a high-pressure drill rod; 3 is a gas extraction pipe; 4 is a pump station water tank; 5 is a high-pressure emulsion pump; 6 is a stirrer; 7 is a pressure gauge; 8 is a high-pressure water pipe; 9 is a blowout prevention sleeve; 10 is a main exhaust pipe; 11 is a deslagging hose; 12 is a slag inlet; 13 is an exhaust port; 14 is a secondary exhaust pipe; 15 is a control valve; 16 is a gas-water-coal separation box; 17 is a baffle; 18 is a U-shaped water drain; 19 is a dust cover; 20 is a sealing ball; 21 is an upper layer filtering baffle; 22 is a lower layer filtering separator; 23 is an upper clamping groove; 24 is a lower clamping groove; 25 is a coal storage metering cabinet; 26 is a slide rail; 27 are handles.
Detailed Description
The present invention will be described in further detail with reference to examples, but embodiments of the present invention are not limited thereto.
As shown in fig. 1, the coal collecting device for jet punching comprises a high-pressure emulsion pump 5, a blowout prevention sleeve 9, a gas-water-coal separation tank 16, a coal storage metering cabinet 25 and a gas extraction pipe 3, wherein the high-pressure emulsion pump 5 is provided with a pressure gauge 7, the input end of the high-pressure emulsion pump is communicated with a pump station water tank 4, the output end of the high-pressure emulsion pump is connected with the rear end of a drilling machine 1 through a high-pressure water pipe 8, the front end of the drilling machine 1 is provided with a high-pressure drill rod 2, the high-pressure drill rod 2 penetrates through a main pipe of the blowout prevention sleeve 9 to drill into a coal seam for jet punching operation, the pump station water tank 4 is filled with surfactant solution, the concentration of the surfactant solution is prepared according to the pressure shown by the pressure gauge of the high-pressure emulsion pump and can be homogenized through a stirrer 6, and the stirrer 6 is a manual stirring rod or an electric stirring blade device; in jet flow punching operation, high-pressure water containing a surfactant enters into a drill hole through a high-pressure water pipe to punch and enhance reflection of coal beds, and under the action of the surfactant, pulverized coal with a large contact angle and poor wettability punched in the drill hole is quickly precipitated in water, so that the pulverized coal can be prevented from being accumulated on the upper layer of a gas-water-coal separation box to form float coal.
As shown in fig. 1, the blowout prevention sleeve 9 is a three-fork tube body, one end of a main tube is fixed on the wall of a drilled hole, the other two branch tubes are respectively arranged upwards and downwards, the main tube is internally sleeved with the high-pressure drill rod 2, the port of the upward branch tube is connected with the main exhaust tube 10, the other end of the main exhaust tube 10 is connected with the gas extraction tube 3, so that the gas flowing out of the drilled hole enters the gas extraction tube 3 through the main exhaust tube 10 under the action of negative pressure, the port of the downward branch tube is connected with the slag discharging hose 11, and the water cinder flowing out of the drilled hole flows into the gas-water-coal separation tank 16 through the slag discharging hose 11.
As shown in fig. 1 and 2, the gas-water-coal separation tank 16 is a square tank body, a slag inlet 12 and an air outlet 13 are arranged above the tank body, the outer diameters of the slag discharge hose 11 and the auxiliary air outlet 14 are respectively consistent with the inner diameters of the slag discharge hose 11 and the auxiliary air outlet 14, so that the slag discharge hose 11 is correspondingly arranged on the slag discharge port 12, the auxiliary air outlet 14 can be correspondingly arranged on the air outlet 13, the other end of the auxiliary air outlet 14 is connected with the gas extraction pipe 3, and a control valve 15 is also arranged at the connecting position; when more gas is flushed from the drill hole, the main exhaust pipe 10 can not timely exhaust the gas, and the gas entering the box body flows through the auxiliary exhaust pipe 14 under the action of negative pressure and enters the gas extraction pipe 3 to be exhausted; the top surface inside the gas-water-coal separation box is also welded with a baffle plate 17, and the baffle plate 17 is arranged between the slag inlet 12 and the exhaust port 13 and is used for preventing water coal slag from splashing.
As shown in fig. 2 and 3, two sides of the outside of the gas-water-coal separation tank 16 are respectively provided with a U-shaped water drainer 18 for draining the sewage in the tank and preventing the gas in the tank from being drained into a roadway along with water; the height H of the U-shaped water drainer 18 is larger than the negative pressure water head H of the gas extraction pipe, and when the height of accumulated water flowing into the U-shaped water drainer 18 exceeds H, the accumulated water is automatically drained from a pipe orifice by self weight; the pipe orifice of the U-shaped water drainage device 18 is provided with a sealing ball 20 made of plastic materials, the pipe orifice is further provided with a dust cover 19, the dust cover 19 is of a four-foot supported umbrella-shaped structure, the sealing ball 20 is wrapped in the umbrella-shaped structure and reserved with a space for the sealing ball to float up and down, the sealing ball 20 can prevent the inside of the box from being communicated with the atmosphere in a non-water drainage state, and the dust cover can prevent dust in a roadway from falling into and blocking the U-shaped pipe and limit the sealing ball on the pipe orifice.
As shown in fig. 2 to 4, two layers of same drawing type filtering baffle plates are arranged in the middle lower position in the gas-water-coal separation tank 16, namely an upper layer filtering baffle plate 21 and a lower layer filtering baffle plate 22, the thicknesses of the two layers of the same drawing type filtering baffle plates are 3mm, a plurality of rows of circular filtering holes with the diameter D are hollowed out and engraved on the surfaces of the same, the row spacing D between each filtering hole is larger than D, the diameter D of each circular filtering hole is set according to the size of the particle size of pulverized coal, and the range of the diameter D is 6 to 13mm; the upper layer filtering baffle 21 and the lower layer filtering baffle 22 are respectively and correspondingly inserted into an upper clamping groove 23 and a lower clamping groove 24 on the surface of the box body, a coal storage metering cabinet 25 is arranged below the upper layer filtering baffle 21 and the lower layer filtering baffle, and the upper clamping groove 23 and the lower clamping groove 24 are arranged in pairs correspondingly up and down and protrude out of the gas-water-coal separation box 16; when the upper layer filtering baffle and the lower layer filtering baffle are inserted into the same depth, the filtering holes of the upper layer filtering baffle and the lower layer filtering baffle are kept overlapped, the deposited and filtered pulverized coal in the box body automatically falls into the coal storage metering cabinet 25 through the filtering holes, the coal storage metering cabinet 25 is of a drawer type structure, sliding rails 26 are arranged on two sides of the cabinet body to reduce friction, and a handle 27 is arranged on the outer side of the cabinet body to facilitate pushing and pulling; after the time t, pulling out the pulverized coal when the coal storage metering cabinet is full of the pulverized coal, and timely pouring the pulverized coal into a mine car or a belt for cleaning, wherein the volume of the coal storage metering cabinet is V, the density of the cleaned pulverized coal is ρ, the pulverized coal is pulled out when the coal storage metering cabinet is full of the pulverized coal, and timely pouring the pulverized coal into the mine car or the belt for cleaning; thus, the mass m of the pulverized coal punched in unit time can be calculated; after the coal storage metering cabinet is fully filled with coal, the lower layer filtering baffle is pulled out for a certain distance, so that gaps among the lower layer filtering holes completely shield the upper layer filtering holes, and pulverized coal in the box body can be prevented from continuously falling into the coal storage metering cabinet, and at the moment, ponding exists in the U-shaped water draining device 18 and plays a role in preventing gas from overflowing, and when the ponding in the gas-water-coal separation box 16 is excessive, the function of automatic drainage can be exerted; after the pulverized coal in the coal storage metering cabinet is cleaned, the lower layer filtering baffle plate is pushed inwards again, the filtering holes of the upper layer and the lower layer are kept overlapped, and the coal can be continuously loaded, so that the cyclic operation is performed.
The coal collecting device for jet punching can be used for measuring the coal yield of the jet punching, and the method specifically comprises the following steps:
step one, before jet punching operation, preparing surfactant solution in a pump station water tank 4; in the jet operation process, high-pressure water containing a surfactant enters a drill hole through a high-pressure water pipe 8 to punch a coal seam for anti-reflection, and the surfactant can enable pulverized coal with a large contact angle and poor wettability punched in the drill hole to rapidly precipitate in water, so that the pulverized coal is prevented from accumulating on the upper layer of a gas-water-coal separation box to form float coal;
step two, coal dust is flushed out for collecting, the gas-water-coal separation box 16 is used for collecting coal slag, one end of the blowout prevention sleeve 9 is fixed on the wall of a drilling hole, gas flushed out of the drilling hole enters the gas extraction pipe 3 for being discharged through the main exhaust pipe under the action of negative pressure, and water coal slag flushed out of the drilling hole flows into the gas-water-coal separation box 16 through the slag discharge hose 11; the gas entering the box body can also flow through the auxiliary exhaust pipe 14 to enter the gas extraction pipe 3 for discharge; the gas-water-coal separation box 16 discharges coal slag through two layers of the same drawing type filtering baffle plates arranged at the lower position of the middle part of the inside of the gas-water-coal separation box, and enters a coal storage metering cabinet 25 below the filtering baffle plates for collection;
step three, measuring the coal expansion amount, wherein the coal storage measuring cabinet 25 is of a regular rectangular structure, and the volume is v; after the coal storage metering cabinet is filled with pulverized coal, the density of the pulverized coal is rho, the coal storage metering cabinet filled with the pulverized coal is pulled out, the pulverized coal in the coal storage metering cabinet is poured into a mine car or a belt to be cleaned out in time, n frames of pulverized coal are poured out from the coal storage metering cabinet in a recording unit time t, the total volume V=nv of the n frames of pulverized coal is calculated, and the mass m of the pulverized coal punched in the unit time can be calculated.
The technological principle of the invention is as follows: firstly, according to the water quantity required by jet flow punching, a proper amount of surfactant is put into a water tank for punching operation, active agent molecules can fully contact with powdered coal with a large contact angle and poor wettability, and under the action of the active molecules, the powdered coal with poor wettability rapidly precipitates in water, so that the phenomenon of forming floating coal by accumulation is avoided at the source; the two sides of the gas-water-coal separation tank are provided with U-shaped water draining devices for draining, in order to avoid water flow back suction caused by the influence of extraction negative pressure, the height H of the U-shaped water draining devices is larger than the negative pressure water head H of the gas extraction pipe, so that the pressure in the U-shaped water draining devices is ensured to be larger than the extraction negative pressure, namely, P=ρgH is the extraction negative pressure, and when the accumulated water height of the water draining devices exceeds H, the accumulated water is automatically drained from a pipe orifice by self weight; because the volume of the coal storage metering cabinet is certain, the mass of the washed pulverized coal in unit time can be calculated by multiplying the density of the precipitated pulverized coal by the volume of the coal storage cabinet.
The present invention is not limited to the preferred embodiments described above, and any person skilled in the art will recognize that equivalent embodiments with modifications or variations can be made without departing from the scope of the invention.
Claims (5)
1. The metering method of the jet flow punching coal yield is characterized in that the metering method is implemented by using a jet flow punching coal collecting device;
the jet flow punching coal collecting device mainly comprises a high-pressure emulsion pump (5), an anti-spraying sleeve (9), a gas-water-coal separation box (16), a coal storage metering cabinet (25) and a gas extraction pipe (3), wherein the input end of the high-pressure emulsion pump (5) is connected with a pump station water tank (4), and the output end of the high-pressure emulsion pump is connected with a drilling machine (1) through a high-pressure water pipe (8); the blowout prevention sleeve (9) is of a three-fork pipeline structure, one end of a main pipe of the blowout prevention sleeve is fixed on the wall of a drilling hole, a high-pressure drill rod (2) is sleeved in the main pipe of the blowout prevention sleeve, the other end of the main pipe is connected with the drilling machine (1) in a sealing manner, one branch pipe is upwards connected with the gas extraction pipe (3) through a main exhaust pipe (10), and the other branch pipe is downwards connected with the gas-water-coal separation box (16) through a slag discharging hose (11); the gas-water-coal separation box (16) is connected with the auxiliary exhaust pipe (14) through the exhaust port (13) and is communicated with the gas extraction pipe (3) under the regulation action of a control valve (15) in a pipeline of the auxiliary exhaust pipe (14); two layers of drawing type filtering baffle plates are arranged in the gas-water-coal separation box (16), and a coal storage metering cabinet (25) is arranged at the lower part of the gas-water-coal separation box;
u-shaped water draining devices (18) are respectively arranged on two sides of a box body of the gas-water-coal separation box (16), so that sewage in the box body can be drained, and gas in the box body can be prevented from being drained into a roadway along with water;
the height of the U-shaped water draining device (18) is larger than the negative pressure water head height of the gas extraction pipe (3) so as to prevent air from being sucked into the gas-water-coal separation box (16) and reduce the gas extraction concentration;
a sealing ball (20) made of plastic is arranged at the pipe orifice of the U-shaped water draining device (18), and a dust cover (19) with a four-foot supporting umbrella-shaped structure is also arranged at the pipe orifice in a matched mode;
the metering method comprises the following steps:
step one, before jet punching operation, preparing surfactant solution in a pump station water tank (4); in the jet operation process, high-pressure water containing a surfactant enters a drill hole through a high-pressure water pipe (8) to punch a coal bed for anti-reflection, and the surfactant can enable pulverized coal with a large contact angle and poor wettability punched in the drill hole to rapidly precipitate in water, so that the pulverized coal is prevented from accumulating on the upper layer of a gas-water-coal separation box to form float coal;
secondly, flushing coal dust to collect coal slag, using a gas-water-coal separation box (16) to collect coal slag, fixing one end of a blowout prevention sleeve (9) on the wall of a drill hole, allowing gas flushed out of the drill hole to enter a gas extraction pipe (3) for discharge under the action of negative pressure through a main exhaust pipe, and allowing water-coal slag flushed out of the drill hole to flow into the gas-water-coal separation box (16) through a slag discharge hose (11); the gas entering the box body can also flow through the auxiliary exhaust pipe (14) to enter the gas extraction pipe (3) for discharge; the gas-water-coal separation box (16) discharges coal slag through two layers of same drawing type filtering baffle plates arranged at the lower position of the middle part of the inside of the gas-water-coal separation box, and enters a coal storage metering cabinet (25) below the filtering baffle plates for collection;
step three, the coal storage metering cabinet (25) is of a regular rectangular structure, and the volume is v; after the coal storage metering cabinet is filled with pulverized coal, the density of the pulverized coal is rho, the coal storage metering cabinet filled with the pulverized coal is pulled out, the pulverized coal in the coal storage metering cabinet is poured into a mine car or a belt to be cleaned out in time, n frames of pulverized coal are poured out from the coal storage metering cabinet in a recording unit time t, the total volume V=nv of the n frames of pulverized coal is calculated, and the mass m of the pulverized coal in unit time can be calculated.
2. The method for measuring the coal yield of jet flow punching according to claim 1, wherein the gas-water-coal separation tank (16) is a square-structure tank body, the slag inlet (12) and the air outlet (13) are arranged on two sides of the top of the tank body, and the outer diameters of the slag inlet and the air outlet are respectively consistent with the inner diameters of the slag discharging hose (11) and the auxiliary exhaust pipe (14).
3. The method for measuring the coal yield of jet flow punching according to claim 2, wherein a baffle plate (17) is welded in the upper surface of the gas-water-coal separation tank (16) to prevent water-coal slag from splashing.
4. The method for measuring the coal yield by jet flow punching according to claim 1, wherein the gas-water-coal separation box (16) is respectively an upper filtering baffle plate (21) and a lower filtering baffle plate (22), and a plurality of rows of circular filtering holes are engraved on the surfaces of the upper filtering baffle plate and the lower filtering baffle plate, and the row spacing between each filtering hole is larger than the diameter of the circular filtering hole.
5. The method for measuring the coal yield by jet flow punching according to claim 4, wherein the upper layer filtering baffle plate (21) and the lower layer filtering baffle plate (22) are square flat plates with square protruding plates at one side and are respectively inserted into an upper clamping groove (23) and a lower clamping groove (24) on the surface of the box body.
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| CN111005753B (en) * | 2019-11-27 | 2021-05-28 | 永城煤电控股集团有限公司 | Coal mine floor drainage roadway cross-layer pore-forming hydraulic punching and cave-building construction method |
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