CN111119976A - Device and method for forming local dust-free space for mine - Google Patents
Device and method for forming local dust-free space for mine Download PDFInfo
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- CN111119976A CN111119976A CN202010070207.1A CN202010070207A CN111119976A CN 111119976 A CN111119976 A CN 111119976A CN 202010070207 A CN202010070207 A CN 202010070207A CN 111119976 A CN111119976 A CN 111119976A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000000428 dust Substances 0.000 claims description 96
- 230000005641 tunneling Effects 0.000 claims description 19
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- 239000003570 air Substances 0.000 description 328
- 238000009423 ventilation Methods 0.000 description 15
- 239000003245 coal Substances 0.000 description 9
- 239000012080 ambient air Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 206010035653 pneumoconiosis Diseases 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 208000028571 Occupational disease Diseases 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
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- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004887 air purification Methods 0.000 description 1
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- 230000006806 disease prevention Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
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- 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
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
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- 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
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
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- 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
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/04—Air ducts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F9/00—Use of air currents for screening, e.g. air curtains
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Abstract
The invention relates to a device and a method for forming a local dust-free space for a mine, wherein the local dust-free space is composed of a plane jet flow air curtain generating device and a fresh air supply system, the plane jet flow air curtain generating device comprises an air curtain generator, an air supply pipe and an air curtain air supply box, the air curtain generator is of a tubular structure, an air supply groove is formed in one side of the air curtain generator, and a plurality of guide vanes are uniformly distributed in the air supply groove; a vertical jet air curtain is blown out of an air supply groove of the air curtain generator, the air curtain is inclined outwards at an angle of 15-20 degrees along a connecting line of the air curtain generator, and a relatively closed dust-free space is defined by a plurality of air curtains which are hermetically connected end to end; and a fresh air supply system is arranged above the dust-free space, and fresh air is supplemented into the dust-free space from top to bottom.
Description
Technical Field
The invention relates to the field of air dust separation for mine occupational disease prevention and control, in particular to a device and a method for forming a local dust-free space for a mine.
Background
Pneumoconiosis has become an important factor for restricting the green sustainable development of coal mines in China. According to statistics, 22701 new cases of pneumoconiosis in China in 2017 are doubled compared with 2009; by the end of 2018, the number of reports of occupational pneumoconiosis in China exceeds 87.3 thousands of cases, and 62.52 percent of the reports are concentrated in the mine operation industry. In recent years, this proportion has been increasing with increasing mechanization of coal mines and increasing number of rock galleries. The coal mine pneumoconiosis phenomenon is so severe because the coal mine dust treatment has the following five difficulties: (1) high dust concentration which can reach 3000 mg/m for heavy plantation, (2) high specific gravity of small-particle-size dust, 50% of dust with the particle size smaller than 2.5 mu m, (3) high dust transportation speed, difficult dust collection, 5m/s transportation speed, (4) dust source point diffusion, dust production everywhere, and (5) narrow underground space and limited equipment arrangement.
The existing coal mine dust treatment modes mainly comprise mask dust isolation, spray dust reduction, foam dust suppression, ventilation dust discharge and dust removal by a dust remover. The mask dust insulation is the last barrier of individual protection, has higher dust insulation effect, but has a lot of problems such as little dust holding capacity, large breathing resistance and influence on communication of workers. Spray dust settling and foam dust suppression belong to open dust removal, and due to high dust transfer rate, the dust collection efficiency is limited. The extraction type ventilation dust exhaust can effectively control the dust in a limited range, but is not suitable for a gas mine. The dust removal of the dust remover combines ventilation and the dust remover, and is the dust treatment technology mainly adopted by the coal mine at present. The core dust removal technology of the dust remover comprises a dust control system and the dust remover, the dust removal efficiency of the existing dust remover can reach more than 99%, but the dust control effect is low, and the dust remover is a bottleneck technology which restricts the efficient operation of the underground coal mine dust removal system.
The ventilation is the most important dust discharging and controlling mode of the tunneling working face, the diffusion and the flow of generated dust can be controlled to a great extent, and a better air purification effect can be achieved by combining a dust removal system. However, in a small space of the driving face, ventilation and dust removal cannot avoid the situation that dust-containing air is completely collected in a short formation and is sent to a dust remover for purification, so that drivers and commanders of the driving face are in an attack atmosphere of dust-containing airflow, and health of operators in the area is threatened.
The existing ventilation dust control method mainly adopts the modes of forced ventilation dust control, long-pressure short-suction dust control, wall-attached air duct process dust control, forced air separation air dust control and the like. Wherein the forced ventilation dust-removing framework wind barrel is arranged at the driver of the development machineThe concentration of the dust and the concentration of the dust at the tail of the development machine exceed 300 mg/m3(ii) a The dust concentration at the driver of the tunneling machine and at the rear of the tunneling machine in a long-pressure short-pumping dust control mode exceeds 100 mg/m3(ii) a The dust control of the wall-attached air duct process can better control the dust on the driving face to diffuse to the roadway, so that the dust concentration behind the driving machine is reduced to 32 mg/m3However, the dust concentration at the driver of the heading machine is higher than 100 mg/m3The dust pollution is serious; the compressed air is divided into air and dust control is to divide the compressed air flow of the wall-attached air duct, and when the air dividing amount is 40%, the dust concentration at the driver of the heading machine can reach lower 22 mg/m3But the dust concentration in the air at the command post is still not improved. It can be seen that the four modes can effectively control the dust at the position near the front of the heading machine, and the dust is purified by the dust removal system in the process of further diffusing to the roadway. However, the ventilation and discharge and control process needs a necessary flowing space to carry the generated dust into a dust suction port (or an inlet of a dust remover), the necessary stroke range is a limited space between the tunneling surface and the tail part of the tunneling machine, active personnel in the space are drivers and command posts of the tunneling machine and are almost completely exposed in the whole stroke carried by airflow after the dust is generated, and the problem becomes the key point and the difficulty of the occupational disease control of the two work posts and is the last problem to be broken through in the whole chain (full coverage) dust prevention work of the tunneling construction.
In addition, after the wall-attached air duct is used, the local ventilation mode of the roadway is changed, potential gas gathering risks can be generated for high-gas outburst mines, and the production safety of coal mines is endangered. The wall-attached air duct technology also has the operation management problems that the air duct is repeatedly disassembled and assembled along with the tunneling and the propelling, the labor intensity of operators is high, and the assembling and disassembling time is long.
At present, the whole rock and large-section roadways of coal mines in China increase year by year, the dust concentration in the tunneling process increases sharply, the content of free silicon dioxide in the generated respiratory dust is increased, and the probability of pathogenic damage to operating personnel is increased manyfold. Due to the fact that the section is enlarged, the air quantity required by ventilation and dust control is increased, the stroke and the flowing space of the air flow in the space of the tunneling surface are enlarged, the existing ventilation and dust control effect is further reduced, and the exposure risk of a driver and a command post of the tunneling machine is larger.
At present, the two stations are protected by methods such as single air curtain dust separation and the like, but the control of dust is only considered from the upstream direction, the influence is weak in other non-interference directions, and the protection of a driver and a command post of the heading machine is further weakened on a complicated airflow flowing heading face with the simultaneous existence of compressed air and exhausted air.
The invention makes up the blind area formed by the dust discharge and control of the working positions of a driver and an operator of the tunneling machine by the existing ventilation dust discharge and control method, soft seals the narrow space of the operating station by arranging the continuous air curtain walls around the station, supplies dust-free air to the soft sealed space by the fresh air system, finally forms a local dust-free space in the narrow space range of the station, effectively isolates the high-concentration dust environment from the station operating space on the premise of not influencing the operation and the visual field of workers, and prevents the dust from invading the workers.
Disclosure of Invention
The invention provides a device and a method for forming a local dust-free space for a mine, aiming at the problem of high dust concentration of drivers and command posts of heading machines.
The technical scheme adopted by the invention is as follows: a device for forming a local dust-free space for a mine is characterized in that the local dust-free space is composed of a plane jet flow air curtain generating device and a fresh air supply system, the plane jet flow air curtain generating device comprises an air curtain generator, an air supply pipe and an air curtain air supply box, the air curtain generator is of a tubular structure, an air supply groove is formed in one side of the air curtain generator, and a plurality of guide vanes are uniformly distributed in the air supply groove; a vertical jet air curtain is blown out of an air supply groove of the air curtain generator, the air curtain is inclined outwards at an angle of 15-20 degrees along a connecting line of the air curtain generator, and a relatively closed dust-free space is defined by a plurality of air curtains which are hermetically connected end to end; and a fresh air supply system is arranged above the dust-free space, and fresh air is supplemented into the dust-free space from top to bottom.
Furthermore, the air curtain generating device comprises at least four air curtain generators, each air curtain generator is vertically installed, an air curtain which meets the windward flow is a first air curtain along the clockwise direction, and the air curtains are rotationally arranged along the same direction to form a closed polygonal space.
Furthermore, the first air curtain of the air curtain generator is opposite to the air supply air flow.
Furthermore, the first air curtain of the air curtain generator forms an angle of 45 degrees, 15 degrees and 20 degrees with the windward flow.
Furthermore, the air curtain generating device comprises at least four air curtain generators, each air curtain generator is vertically installed, the air curtain which is in head-on air flow is a first air curtain and a second air curtain, a certain included angle is formed between the first air curtain and the second air curtain to guide the air flow to two sides, and a third air curtain, a fourth air curtain and an Nth air curtain are arranged to respectively receive the first air curtain and the second air curtain to finally enclose a closed dust-free space.
The air curtain air supply box is connected to the top of the air curtain generator through an air supply pipe. The fresh air supply system comprises a fresh air supply box and short-range air distribution pipe assemblies, an air inlet pipe is arranged on one side of the fresh air supply box, the short-range air distribution pipe assemblies with equal length are uniformly distributed on the bottom surface of the fresh air supply box, and the air inlet end of the fresh air supply box is connected with an air filter; the air curtain air supply box is arranged at the top of the fresh air supply box, and the air curtain generator is arranged below the fresh air supply box.
The upper end of the air curtain generator is open, the lower end of the air curtain generator is closed, and the open end of the air curtain generator is connected with an air supply pipe; the height of the air curtain generator is 1200-1800 mm, and the inner diameter of the cross section is 110-140mm according to different setting ranges of the height of the air curtain generator; the length, the height and the width of the air supply groove are (1050 mm-1650 mm) multiplied by 35mm multiplied by 10 mm; the guide vanes are uniformly distributed along the length of the air supply groove, the distance between the guide vanes is 30-40 mm, the guide vanes are bent into an arc shape, the included angle between the tangent line of one side of the guide vanes close to the bottom of the air supply groove and the axial direction of the air curtain generator is 45 degrees, and the included angle between the tangent line of one side of the guide vanes close to the notch of the air supply.
The air flow velocity at any position in the air curtain air supply box is not higher than 1/2 of the air flow velocity in the air curtain generator air supply main pipe. The ventilator supplies air to the air curtain air supply box, the air curtain air supply box uniformly distributes air to each air curtain generator, and the size of the air curtain air supply box can be flexibly designed according to the equipment arrangement space.
The air filter selects a commercial anti-static air filter, and the flow of the filter is selected according to the fresh air supply volume according to the conventional ventilation design. It is installed in new trend air feed case front end, provides clean air for new trend air feed case.
The fresh air supply box covers the top of the dust-free space, and a short-distance air distribution pipe assembly is installed at the bottom of the fresh air supply box and provides airflow for the short-distance air distribution pipe. The diameter of the short-range air distribution pipe is 20mm, the short-range air distribution pipe protrudes outwards by 10mm, and the arrangement density of the fresh air supply box is 200 pieces/m2The airflow speed of the short-distance air dividing pipe is set to be 4.2-8.4 m/s. The top of the dust-free space of the fresh air supply box is provided with an air inlet, and the short-distance air distribution pipe is a fresh air outlet. The total volume design principle of the fresh air supply box is that the minimum air flow speed inside is not more than 4m/s so as to ensure that the whole short-distance air distribution pipe can uniformly supply air.
The short distance divides the wind pipe subassembly to be the pipe form, down supplies gas perpendicularly from the top, can realize that the new trend gets into just can evenly distributed at the whole section in dustless space after the dustless space extremely short distance, guarantees the full coverage of new trend from the top down, is the key link that realizes dustless space.
The working method of the local dust-free space comprises the following steps: the air curtain generator supplies air to the air box through the air curtain, the air curtain is blown out of the plane jet air curtain at an angle of 15-20 degrees along the connecting line of the air curtain generator, the air curtains are connected end to form a relatively closed space, and dust-containing air flow flowing to a driver of the tunneling machine in a tunneling roadway is isolated. Fresh air is uniformly fed into the local dust-free space from the short-range air distribution pipe assembly, so that fresh air is supplemented into the local dust-free space. The jet speed of the air curtain is 11.8-16.5m/s, and the air flow speed of the short-distance air dividing pipe is 4.2-8.4 m/s. The local dust-free space can effectively control the invasion of the dust-containing head stream of the working face to the space, and the dust concentration does not exceed 500mg/m under the condition that the head stream speed of the working face is not more than 2m/s3In the case of (2), the dust content of the air in the local dust-free space is not more than 2mg/m3. The effect that the visual field of the operator is not influenced and the space where the operator is located can be effectively isolated is achieved.
The invention has the beneficial effects that: in the process of tunneling in mines, tunnels and the like, a dust-free tiny clean space is created for drivers and command posts of the tunneling machine, and the worldwide problem that the drivers and the command posts on a tunneling working face are exposed in high-concentration dust to suffer from pneumoconiosis is effectively solved. It is also suitable for preventing and treating occupational protection of operators and occupational diseases such as pneumoconiosis in other non-point sources such as dust, abnormal gas and the like.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural diagram of embodiment 1.
Fig. 3 is a schematic structural diagram of embodiment 2.
FIG. 4 is a schematic structural diagram of embodiment 3.
Fig. 5 is a schematic structural view of the air curtain generator.
FIG. 6 is a schematic view of the construction of the air supply box of the air curtain.
FIG. 7 is a side view of a supply box of the air curtain.
Fig. 8 is a state diagram of the present invention in use downhole.
Detailed Description
As shown in fig. 1, a device for forming a local dust-free space for a mine, the local dust-free space is composed of a plane jet flow air curtain generating device 1 and a fresh air supply system 2, the plane jet flow air curtain generating device 1 comprises an air curtain generator 1-1, an air supply pipe 1-2 and an air curtain air supply box 1-3, the air curtain generator 1-1 is of a tubular structure, an air supply groove 1-11 is arranged on one side of the air curtain generator, and a plurality of guide vanes 1-12 are uniformly distributed in the air supply groove 1-11; the air curtain generator is characterized in that a vertical air curtain is blown out of an air supply groove 1-11 of the air curtain generator 1-1, the air curtain is inclined outwards by an angle of 11-20 degrees along a connecting line of the air curtain generator 1-1, a plurality of air curtains which are hermetically connected end to end enclose a relatively closed dust-free space, and the air curtain guides air supply air flow to form annular air flow which flows to a certain specific direction along the outside of the dust-free space; and a fresh air supply system 2 is arranged above the dust-free space, and fresh air is supplemented into the dust-free space from top to bottom.
As shown in fig. 1, the curtain supply box 1-3 is connected to the top of the curtain generator 1-1 through a supply duct 1-2. The fresh air supply system 2 comprises a fresh air supply box 2-1 and a short-range air distribution pipe component 2-2, an air inlet pipe 2-3 is arranged on one side of the fresh air supply box 2-1, the short-range air distribution pipe components 2-2 with equal length are uniformly distributed on the bottom surface of the fresh air supply box, and the air inlet end of the fresh air supply box 2-1 is connected with an air filter; the air curtain air supply box 1-3 is arranged at the top of the fresh air supply box 2-1, and the air curtain generator 1-1 is arranged below the fresh air supply box 2-1.
As shown in fig. 1 and 5, the air curtain generator 1-1 has an open upper end and a closed lower end, and the open end is connected with an air supply pipe 1-2; the height of the air curtain generator 1-1 is 1200-1800 mm, and the inner diameter of the cross section is 110-140mm according to different height settings of the air curtain generator 1-1; the length, the height and the width of the air supply groove are 1-11 mm, the length, the height and the width of the air supply groove are 1050-1650 mm, and the width of the air supply groove is 35mm and the width of the air supply groove is 10 mm; the guide vanes 1-12 are uniformly distributed along the length of the air supply groove 1-11, the distance between the guide vanes 1-12 is 30-40 mm, the guide vanes are bent into an arc shape, the included angle between the tangent line of one side of the guide vanes 1-12 close to the bottom of the air supply groove 1-11 and the axial direction of the air curtain generator 1-1 is 45 degrees, and the included angle between the tangent line of one side of the guide vanes 1-12 close to the notch of the air supply groove 1-11 and the.
As shown in fig. 6 and 7, the air flow velocity at any position in the air curtain supply box 2-1 is not higher than 1/2 of the air flow velocity in the main air supply pipe of the air curtain generator 1-1. The ventilator supplies air to the air curtain air supply box 2-1, the air curtain air supply box 2-1 uniformly distributes air to each air curtain generator 1-1, and the size of the air curtain air supply box 2-1 can be flexibly designed according to the equipment arrangement space.
The air filter selects a commercial anti-static air filter, and the flow of the filter is selected according to the fresh air supply volume according to the conventional ventilation design. Which is arranged at the front end of a fresh air supply box 2-1 and provides clean air for the fresh air supply box 2-1.
As shown in fig. 6 and 7, the fresh air supply box 2-1 covers the top of the dust-free space, and a short-distance air distribution pipe assembly 2-2 is installed at the bottom of the fresh air supply box to supply air to the short-distance air distribution pipe 2-2And (4) streaming. The diameter of the short-range air distribution pipe 2-2 is 20mm, the short-range air distribution pipe protrudes 10mm outwards, and the arrangement density of the fresh air supply box 2-1 is 200-2The air flow speed of the short-distance air dividing pipe 2-2 is set to be 4.2-8.4 m/s. The top of the dust-free space of the fresh air supply box 2-1 is provided with an air inlet pipe 2-3, and the short-range air distribution pipe 2-2 is a fresh air outlet. The total volume design principle of the fresh air supply box 2-1 is that the minimum air flow speed inside is not more than 4m/s, so that the whole short-range air distribution pipe 2-2 can uniformly supply air.
The short-range air distributing pipe 2-2 assembly is in a circular pipe shape and vertically supplies air from top to bottom, fresh air can be uniformly distributed on the whole section of a dust-free space after entering the dust-free space for a short distance, the full coverage of the fresh air from top to bottom is guaranteed, and the short-range air distributing pipe is a key link for realizing the dust-free space.
The working method of the local dust-free space is shown in figure 2:
the air curtain generator 1-1 supplies air from an air curtain supply box 2-1, and blows out a plane jet air curtain at an angle of 15-20 degrees along the connecting line of the air curtain generator 1-1 in a certain direction, and the air curtains are connected end to form a relatively closed space to isolate dust-containing air flow flowing to a driver of the heading machine in a heading tunnel. Fresh air is uniformly fed into the local dust-free space from the short-range air distribution pipe assembly 2-2, and fresh air is supplemented into the local dust-free space. The jet speed of the air curtain is 11.8-16.5m/s, and the air flow speed of the short-range air dividing pipe 2-2 is 4.2-8.4 m/s. The local dust-free space can effectively control the invasion of the dust-containing head stream of the working face to the space, and the dust concentration does not exceed 500mg/m under the condition that the head stream speed of the working face is not more than 2m/s3In the case of (2), the dust content of the air in the local dust-free space is not more than 2mg/m3. The effect that the visual field of the operator is not influenced and the space where the operator is located can be effectively isolated is achieved.
In field work, a local dust-free space works in a transverse ambient air flow, and the air flow generated by the air curtain is blown by the ambient air flow and is inconsistent with the original flow direction. The arrangement of the local spatial planar jet air curtain differs according to the magnitude of the ambient air flow as shown in fig. 2-4.
Embodiment mode 1
When the ambient air flow is less than 0.5m/s, the influence of the blowing of the ambient air flow on the cross-flow air curtain is small, taking the four air curtain generators 1-1 as an example, the air supply modes of the four air curtain generators 1-1 can be distributed according to the clockwise rotation directions connected end to form a square space, the air curtain generated by the first air curtain generator A blocks the front-facing air flow, the air supply groove of the first air curtain generator A rotates outwards by 15-20 degrees relative to the connecting line between the first air curtain generator A and the second air curtain generator B, and the air flow is guided to one side while the front-facing air is blocked. The air output of the first air curtain generator a and the fourth air curtain generator D can be increased by 20% compared with the second air curtain generator B and the third air curtain generator C, so as to reduce the influence of the windward flow on the air curtain, as shown in fig. 2.
Embodiment mode 2
When the ambient air flow is 0-1.0 m/s, the arrangement mode of the air curtain generator 1-1 is determined according to the requirement condition of the installation space of the heading machine. Taking the four air curtain generators 1-1 as an example, the four air curtain generators 1-1 are arranged into a square, the air curtains generated by the four air curtain generators are connected end to end, the first air curtain generator a is arranged right opposite to the windward flow, the air supply grooves 1-11 of the first air curtain generator a and the windward flow form a certain angle, for example, the first air curtain generator a and the first air curtain generator a are arranged at 45 degrees to 15 degrees to 20 degrees clockwise to the direction of the windward flow, and the air flow is led to one side, wherein the air supply volume of the air supply columns of the third air curtain generator C and the fourth air curtain generator D can be 20 percent greater than that of the first air curtain generator a and the second air curtain generator B, so as to improve the interference of the reverse air flow to the windward flow, as shown in fig. 3.
Embodiment 3
When the ambient wind flow is 1.0-2.0 m/s, the ambient wind flow has a large influence on the windward curtain, and the four wind curtain generators 1-1 are taken as an example. The first air curtain generator A is arranged right opposite to the windward flow, air supply grooves 1-11 of the first air curtain generator A are arranged at 45-15-20 degrees clockwise relative to the windward flow direction, the third air curtain generator C, the fourth air curtain generator D and the first air curtain generator A form an isosceles triangle, one side of the first air curtain generator A is provided with a second air curtain generator B, the second air curtain generator 2 is positioned on a connecting line of the first air curtain generator A and the third air curtain generator C, the air supply grooves 1-1 of the first air curtain generator A and the air supply grooves of the first air curtain generator A are arranged at 90 degrees to guide the windward flow to two sides, and the air supply grooves 1-11 of the third air curtain generator C and the fourth air curtain generator D are symmetrically arranged in directions, point to extension lines of the central lines of the isosceles triangles and are opposite to the direction of the first air curtain generator A. The air supply volume of the air supply columns of the third air curtain generator C and the fourth air curtain generator D can be 20% larger than that of A, B, so that the interference of the reverse wind flow against the windward flow is improved, as shown in FIG. 4.
According to the different direction and size of the mine airflow, the combination form of the dust-free space plane jet flow air curtain can be selected correspondingly according to the 3 conditions.
Claims (10)
1. A device for forming a local dust-free space for a mine is characterized in that the local dust-free space is composed of a plane jet flow air curtain generating device and a fresh air supply system, the plane jet flow air curtain generating device comprises an air curtain generator, an air supply pipe and an air curtain air supply box, the air curtain generator is of a tubular structure, an air supply groove is formed in one side of the air curtain generator, and a plurality of guide vanes are uniformly distributed in the air supply groove; a vertical jet air curtain is blown out of an air supply groove of the air curtain generator, the air curtain is inclined outwards at an angle of 15-20 degrees along a connecting line of the air curtain generator, and a relatively closed dust-free space is defined by a plurality of air curtains which are hermetically connected end to end; and a fresh air supply system is arranged above the dust-free space, and fresh air is supplemented into the dust-free space from top to bottom.
2. The device for forming the local dust-free space for the mine according to claim 1, wherein the air curtain generator comprises at least four air curtain generators, each air curtain generator is vertically arranged, the air curtain which is in head-on air flow in a clockwise direction is a first air curtain, and the air curtains are rotatably arranged in the same direction to form a closed polygonal space.
3. The apparatus for forming a local dust-free space for a mine according to claim 2, wherein the first air curtain of the air curtain generator is opposite to the air supply air flow.
4. The apparatus for forming a local dust-free space for a mine according to claim 2, wherein the first air curtain of the air curtain generator forms an angle of 45 °, 15 ° and 20 ° with the windward flow.
5. The device for forming the local dust-free space for the mine according to claim 1, wherein the air curtain generator comprises at least four air curtain generators, each air curtain generator is vertically installed, the air curtains facing the windward flow are a first air curtain and a second air curtain, a certain included angle is formed between the first air curtain and the second air curtain to guide the windward flow to two sides, and a third air curtain, a fourth air curtain and an Nth air curtain respectively receive the first air curtain and the second air curtain and finally enclose a closed dust-free space.
6. The apparatus for forming a local dust-free space for a mine according to claim 1, wherein the air curtain air supply box is connected to the top of the air curtain generator through an air supply pipe; the air flow velocity at any position in the air curtain air supply box is not higher than 1/2 of the air flow velocity in the air curtain generator air supply main pipe.
7. The device for forming the local dust-free space for the mine according to claim 1, wherein the air curtain generator is open at the upper end and closed at the lower end, and the open end is connected with an air supply pipe; the height of the air curtain generator is 1200-1800 mm, and the inner diameter of the cross section is 110-140mm according to different setting ranges of the height of the air curtain generator; the length, the height and the width of the air supply groove are (1050 mm-1650 mm) multiplied by 35mm multiplied by 10 mm; the guide vanes are uniformly distributed along the length of the air supply groove, the distance between the guide vanes is 30-40 mm, the guide vanes are bent into an arc shape, the included angle between the tangent line of one side of the guide vanes close to the bottom of the air supply groove and the axial direction of the air curtain generator is 45 degrees, and the included angle between the tangent line of one side of the guide vanes close to the notch of the air supply.
8. The device for forming the local dust-free space for the mine according to claim 1, wherein the fresh air supply system comprises a fresh air supply box and a short-range air distribution pipe assembly, an air inlet pipe is arranged on one side of the fresh air supply box, the short-range air distribution pipe assemblies with equal length are uniformly distributed on the bottom surface of the fresh air supply box, and an air inlet end of the fresh air supply box is connected with an air filter; the air curtain air supply box is arranged at the top of the fresh air supply box, and the air curtain generator is arranged below the fresh air supply box.
9. The device for forming the local dust-free space for the mine according to claim 1, wherein the fresh air supply box covers the top of the dust-free space, and a short-distance air distribution pipe assembly is arranged at the bottom of the fresh air supply box and provides air flow for the short-distance air distribution pipe; the diameter of the short-range air distribution pipe is 20mm, the short-range air distribution pipe protrudes outwards by 10mm, and the arrangement density of the fresh air supply box is 200 pieces/m2The air flow speed of the short-distance air dividing pipe is set to be 4.2-8.4 m/s; the top of the dust-free space of the fresh air supply box is provided with an air inlet, and the short-distance air distribution pipe is a fresh air outlet; the total volume design principle of the fresh air supply box is that the minimum air flow speed inside is not more than 4m/s so as to ensure that the whole short-distance air distribution pipe can uniformly supply air.
10. The apparatus as claimed in any one of claims 1 to 9, wherein the local dust-free space working method comprises: the air curtain generator supplies air to the air box through an air curtain, the air curtain is blown out of the plane jet air curtain in a certain direction at an angle of 15-20 degrees of outward deflection along the connecting line of the air curtain generator, the air curtains are connected end to form a relatively closed space, and dust-containing air flow flowing to a driver of the tunneling machine in a tunneling roadway is isolated; fresh air is uniformly fed into the local dust-free space from the short-range air distributing pipe assembly to supplement fresh air into the local dust-free space; the jet speed of the air curtain is 11.8-16.5m/s, and the air flow speed of the short-distance air distributing pipe is 4.2-8.4 m/s; the local dust-free space can effectively control the invasion of the dust-containing head stream of the working face to the space, and the dust concentration does not exceed 500mg/m under the condition that the head stream speed of the working face is not more than 2m/s3In the case of (2), the dust content of the air in the local dust-free space is not more than 2mg/m3(ii) a The visual field of the operator is not influenced, and the operator can be effectively positionedThe space is effectively isolated.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010070207.1A CN111119976B (en) | 2020-01-21 | 2020-01-21 | Device and method for forming mining local dust-free space |
| PCT/CN2020/142102 WO2021147644A1 (en) | 2020-01-21 | 2020-12-31 | Device and method for forming local dust-free space for use in mine |
| AU2020104462A AU2020104462A4 (en) | 2020-01-21 | 2020-12-31 | Device and method for forming local dust-free space for use in mine |
| AU2020424264A AU2020424264A1 (en) | 2020-01-21 | 2020-12-31 | Device and method for forming local dust-free space for use in mine |
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| CN202010070207.1A CN111119976B (en) | 2020-01-21 | 2020-01-21 | Device and method for forming mining local dust-free space |
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| CN111119976A true CN111119976A (en) | 2020-05-08 |
| CN111119976B CN111119976B (en) | 2024-05-24 |
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| CN (1) | CN111119976B (en) |
| AU (2) | AU2020104462A4 (en) |
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| CN112682085A (en) * | 2020-12-12 | 2021-04-20 | 中国人民解放军军事科学院国防工程研究院 | Purification and dust removal system for controlling dust concentration in tunnel interior decoration construction |
| CN112918806A (en) * | 2021-01-28 | 2021-06-08 | 西安奕斯伟硅片技术有限公司 | Silicon wafer packing device |
| WO2021147644A1 (en) * | 2020-01-21 | 2021-07-29 | 中国矿业大学 | Device and method for forming local dust-free space for use in mine |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2021147644A1 (en) | 2021-07-29 |
| AU2020424264A1 (en) | 2021-09-16 |
| CN111119976B (en) | 2024-05-24 |
| AU2020104462A4 (en) | 2021-10-14 |
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