AU2020104462A4 - Device and method for forming local dust-free space for use in mine - Google Patents
Device and method for forming local dust-free space for use in mine Download PDFInfo
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- AU2020104462A4 AU2020104462A4 AU2020104462A AU2020104462A AU2020104462A4 AU 2020104462 A4 AU2020104462 A4 AU 2020104462A4 AU 2020104462 A AU2020104462 A AU 2020104462A AU 2020104462 A AU2020104462 A AU 2020104462A AU 2020104462 A4 AU2020104462 A4 AU 2020104462A4
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000005065 mining Methods 0.000 claims abstract description 15
- 239000013589 supplement Substances 0.000 claims abstract description 4
- 239000000428 dust Substances 0.000 claims description 93
- 238000013459 approach Methods 0.000 claims description 25
- 238000009412 basement excavation Methods 0.000 claims description 4
- 230000000712 assembly Effects 0.000 claims description 3
- 238000000429 assembly Methods 0.000 claims description 3
- 239000003570 air Substances 0.000 description 343
- 238000009423 ventilation Methods 0.000 description 15
- 239000003245 coal Substances 0.000 description 9
- 239000012080 ambient air Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 206010035653 pneumoconiosis Diseases 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000002955 isolation Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000002265 prevention Effects 0.000 description 4
- 208000028571 Occupational disease Diseases 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 230000005012 migration Effects 0.000 description 3
- 238000013508 migration Methods 0.000 description 3
- 230000005641 tunneling Effects 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000004887 air purification Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001717 pathogenic effect Effects 0.000 description 1
- 230000000241 respiratory effect Effects 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ventilation (AREA)
Abstract
The present invention relates to an apparatus and a method for forming a partially
dust-free space for mining. The partially dust-free space includes a planar jet air curtain
generation apparatus and a fresh air supply system. The planar jet air curtain generation
apparatus includes an air curtain generator, an air supply duct, and an air curtain supply
box. The air curtain generator is of a tubular structure. An air exhaust groove is formed
on one side of the air curtain generator, and a plurality of deflector blades are uniformly
distributed in the air exhaust groove. A vertical jet air curtain is blown out of the air
exhaust groove of the air curtain generator. The air curtain is inclined outwards at an
angle of 150 to 200 along a connecting line of the air curtain generator, and a plurality of
air curtains hermetically connected end to end enclose a relatively closed dust-free space.
The fresh air supply system is arranged above the dust-free space, to supplement fresh air
into the dust-free space from top to bottom.
7/7
¼
F 8
FIG. 8
Description
7/7
¼
F 8
FIG. 8
s TEAHNICALFIELD
[0001] The present invention relates to the field of air dust isolation for prevention and control of occupational diseases in mines, and in particular, to an apparatus and a method for forming a partially dust-free space for mining.
[0002] Pneumoconiosis has become an important factor that restricts the green and sustainable development of coal mines in China. According to statistics, there were 22,701 new cases of pneumoconiosis in China in 2017, doubling the number in 2009; by the end of 2018, more than 873,000 cases of occupational pneumoconiosis were reported in China, 62.52% of which were concentrated in the mining industry. In recent years, with the increasing mechanization of coal mines and the increasing number of rock tunnels, this proportion has continued to rise. The reason why the phenomenon of coal mine pneumoconiosis is so serious is that there are five major difficulties in coal mine dust management: (1) high dust concentration, which can be as high as 3000 mg/m 3; (2) large proportion of small particle size dust, where dust with particle sizes of less than 2.5 m can reach 50%; (3) difficult dust collection due to a high migration speed of dust, where the migration speed can reach 5 m/s; (4) dispersed dust source points, causing dust everywhere; and (5) small underground space and restricted device arrangement.
[0003] Existing coal mine dust control methods mainly include dust isolation with masks, dust reduction through spraying, dust suppression with foam, dust discharge through ventilation, and dust removal with dust collectors. Dust isolation with masks is the last barrier for individual protection and has a relatively high dust isolation effect, but there are many problems such as small dust capacity, high breathing resistance, and affecting staff communication. Dust reduction through spraying and dust suppression with foam are open dust removal and have limited efficiency in capturing dust due to a relatively high dust migration rate. Dust discharge through extraction-based ventilation can effectively control dust to a limited extent, but is inapplicable to gas mines. Dust removal with dust collectors combines ventilation and dust collectors and is a mainly used dust management technology in coal mines currently. A core technology of dust removal with dust collectors includes a dust control system and a dust collector. Dust removal efficiency of the existing dust collector can reach at least 99%, but a dust control effect is relatively low, which is a bottleneck technology restricting efficient operation of an underground dust removal system in the coal mines.
[0004] Ventilation is the most important method for dust discharge and dust control in a heading face, can greatly control dust diffusion and flow after dust generation, and can achieve a favorable air purification effect in combination with the dust removal system. However, in a small space of the heading face, dust discharge through ventilation cannot achieve complete capturing or sending of dusty air to the dust collector, causing a driver and a commander of the heading face to be surrounded by dusty air flows, threatening the health of the operators in the area.
[0005] Existing dust removal, and dust control methods through ventilation mainly include dust discharge through press-in ventilation, long-pressure short-extraction dust control, dust control with a wall-mounted air duct process, and dust control through pressurized and split air. Dust concentration at a skeleton air duct of the dust discharge through press-in ventilation, dust concentration at the driver of the roadheader, and dust concentration at the end of the roadheader all exceed 300 mg/m 3 . Dust concentration at the driver of the roadheader and dust concentration behind the roadheader in the long-pressure short-extraction dust control method both exceed 100 mg/m 3. The dust control with a wall-mounted air duct process can favorably control diffusion of dust from the heading face to the roadway, and reduce the dust concentration behind the roadheader to 32 mg/m 3, but the dust concentration at the driver of the roadheader is higher than 100 mg/m 3, with serious dust pollution. The dust control through pressurized and split air is to split a pressurized air flow from the wall-mounted air duct. When an air volume is
40%, dust concentration at the driver of the roadheader can reach a relatively low value of 22 mg/m 3 , but dust concentration in the air at the command post is still not improved. It can be learned that the four manners can effectively control dust near the front of the roadheader, and the dust is cleaned by the dust removal system during further diffusion to the roadway. However, a flow space is required in the discharge and control process through ventilation to carry dust into a dust inlet (or a dust collector inlet). This necessary stroke range is the limited space between the heading face and a rear portion of the roadheader. The driver of the roadheader and the command post are actively working within this space, and therefore are almost completely exposed to the entire stroke of dust generated and carried in the air flow. This problem has become the focus and difficulty of prevention and control of occupational diseases in the two jobs, and the last problem to be resolved in an entire chain (full coverage) of dust prevention during the entire tunneling construction.
[0006] In addition, the use of the wall-mounted air duct changes the local ventilation of the roadway, causing a potential risk of gas accumulation in high gas prominence mines and endangering production safety of coal mines. For the wall-mounted wall duct technology, there are also operational and management problems of repeated disassembly and mounting of ducts as the excavation advances, high labor intensity of operators, and long time spent on loading and unloading.
[0007] Currently, the number of all-rock, large-section roadways in coal mines in China is increasing year by year, and the dust concentration in the tunneling process is increasing dramatically, resulting in higher free silica content of respiratory dust, which increases the chances of pathogenic injury to operators exponentially. Due to the increase of the cross section, the air volume required for dust discharge and control through ventilation is increased, and the stroke and flow space of the air flow in the space of the heading face become larger. Consequently, the effect of the existing dust discharge and control through ventilation is further reduced, and the driver of the roadheader and the command post are more likely to be exposed to greater risks.
[0008] At present, in methods for protecting the two work stations such as dust isolation with a single air curtain, only dust control from the direction of the approach air flow is considered, leading to weak impact on other non-intervention directions, and further weakening the protection for the driver and command post of the roadheader in a heading face with complex air flows where both pressurized air and exhaust air exist.
[0009] The present invention makes up for a blind area, caused by the existing dust discharge and control method through ventilation, for dust discharge and control at the working positions of the driver of the roadheader and the operator. A continuous air curtain wall is disposed around the work stations to softly seal the narrow space of the operating work stations, dust-free air is supplied to the softly sealed space by the fresh air system, and finally a partially dust-free space is formed within the narrow space of the work stations. In this way, a high-concentration dust environment is effectively isolated from the operating space of the work stations without affecting the operation and vision of the workers, thereby protecting the workers from dust.
[0010] In view of the problem of high dust concentration at positions of a driver of a roadheader and a command post, the present invention provides an apparatus and a method for forming a partially dust-free space for mining.
[0011] The following technical solutions are used in the present invention: An apparatus for forming a partially dust-free space for mining. The partially dust-free space includes a planar jet air curtain generation apparatus and a fresh air supply system. The planar jet air curtain generation apparatus includes an air curtain generator, an air supply duct, and an air curtain supply box. The air curtain generator is of a tubular structure. An air exhaust groove is formed on one side of the air curtain generator, and a plurality of deflector blades are uniformly distributed in the air exhaust groove. A vertical jet air curtain is blown out of the air exhaust groove of the air curtain generator. The air curtain is inclined outwards at an angle of 15° to 200 along a connecting line of the air curtain generator, and a plurality of air curtains hermetically connected end to end enclose a relatively closed dust-free space. The fresh air supply system is arranged above the dust-free space, to supplement fresh air into the dust-free space from top to bottom.
[0012] Further, the air curtain generation apparatus includes at least four air curtain generators, each air curtain generator is vertically mounted, along a clockwise direction, an air curtain facing an approach air flow is a first air curtain, and the air curtains are arranged in rotation in a same direction, to form a closed polygon space.
[0013] Still further, the first air curtain of the air curtain generator exactly faces an air exhaust flow.
[0014] Still further, the first air curtain of the air curtain generator forms an angle of 45, 15°, or 20° with the approach air flow.
[0015] Further, the air curtain generation apparatus includes at least four air curtain generators, each air curtain generator is vertically mounted, air curtains facing an approach air flow are a first air curtain and a second air curtain, an angle exists between the first air curtain and the second air curtain, leading the air flow to two sides, and a third air curtain and a fourth air curtain to an Nth air curtain follow the first air curtain and the second air curtain, to finally enclose a closed dust-free space.
[0016] The air curtain supply box is connected to a top portion of the air curtain generator through the air supply duct. The fresh air supply system includes a fresh air supply box and a short-range air duct assembly, one side of the fresh air supply box is provided with an air inlet duct, short-range air duct assemblies with equal lengths are uniformly distributed on a bottom surface of the fresh air supply box, and an air inlet end of the fresh air supply box is connected to an air filter; and the air curtain supply box is mounted on a top portion of the fresh air supply box, and the air curtain generator is arranged below the fresh air supply box.
[0017] The air curtain generator has an open upper end and a closed lower end, and the open end is connected to the air supply duct; the height of the air curtain generator ranges from 1200 mm to 1800 mm, and an inner diameter of a cross section is set in a range of 110 mm to 140 mm depending on the height of the air curtain generator; the length, the height, and the width of the air exhaust groove are (1050 mm to 1650 mm) x 35 mm x 10 mm; the deflector blades are uniformly distributed along the length of the air exhaust groove, the deflector blades are spaced apart by 30 mm to 40 mm and are bent into an arc shape, an angle between an axial direction of the air curtain generator and a tangent of the deflector blade on a side close to a groove bottom of the air exhaust groove is 45, and an angle between a horizontal direction and a tangent of the deflector blade on a side close to a groove opening of the air exhaust groove is 20 to 25°.
[0018] An air flow speed at any position in the air curtain supply box is not higher than 1/2 of an air flow speed in a main air supply duct of the air curtain generator. The air curtain supply box supplies an air flow to the air curtain generator. A ventilator supplies air to the air curtain supply box. The air curtain supply box uniformly distributes air to each air curtain generator. A size of the air curtain supply box may be designed flexibly based on a device arrangement space.
[0019] The air filter is a commercial anti-static air filter, designed based on conventional ventilation. A filter flow rate is selected based on a fresh air supply volume. The air filter is mounted at a front end of the fresh air supply box to provide clean air for the fresh air supply box.
[0020] The fresh air supply box covers a top portion of the dust-free space, and a short-range air duct assembly is mounted on a bottom portion of the fresh air supply box, to provide an air flow for a short-range air duct. The short-range air duct has a diameter of 20 mm, protruding outwards by 10 mm, an arrangement density of short-range air ducts in the fresh air supply box is 200 to 230 short-range air ducts per square meter, and an air flow speed of the short-range air duct is set to 4.2 m/s to 8.4 m/s. The fresh air supply box is provided with an air inlet on the top portion of the dust-free space, and the short-range air duct serves as a fresh air outlet. A total volume of the fresh air supply box is designed with a principle that a minimum internal air flow speed is not greater than 4 m/s, to ensure uniform air supply throughout the short-range air duct.
[0021] The short-range air duct assembly is in a shape of a round tube, supplying air vertically from top to bottom, so that fresh air can be uniformly distributed across an entire cross section of the dust-free space after entering the dust-free space for a very short distance, thereby ensuring full coverage of the fresh air from top to bottom, which is a key step of achieving the dust-free space.
[0022] A working method of the partially dust-free space is that: the air curtain generator is supplied with air by the air curtain supply box, to blow out a planar jet air curtain in a particular direction at the angle of 15 to 20° inclined outwards along the connection line of the air curtain generator, and the air curtains are connected end to end, to form the relatively closed space, to isolate a dusty air flow from an excavation roadway to a driver of a roadheader. Fresh air is uniformly supplied into the partially dust-free space from the short-range air duct assembly above the partially dust-free space. An air curtain jet speed is 11.8 m/s to 16.5 m/s, and an air flow speed of the short-range air duct is 4.2 m/s to 8.4 m/s. The partially dust-free space is capable of effectively controlling intrusion of a dusty approach air flow of a working surface into the space, and a dust content of air in the partially dust-free space is not greater than 2 mg/m3 when an approach air flow speed of the working surface is not greater than 2 m/s and a dust concentration does not exceed 500 mg/m 3 , thereby effectively isolating a space where an operator is located without affecting the operator's vision.
[0023] The present invention has the following advantageous effects: In a tunneling process of mines, tunnels, and the like, providing a tiny clean dust-free space for a driver of a roadheader and a command post effectively resolves a worldwide problem of pneumoconiosis caused by exposure of the driver and the command post of a heading face to high-concentration dust. The present invention is also applicable to other non-point sources, such as dust, abnormal gas, and other environments for occupational protection of workers and prevention and control of occupational diseases such as pneumoconiosis. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] FIG. 1 is a schematic structural diagram of the present invention.
[0025] FIG. 2 is a schematic structural diagram of Embodiment 1.
[0026] FIG. 3 is a schematic structural diagram of Embodiment 2.
[0027] FIG. 4 is a schematic structural diagram of Embodiment 3.
[0028] FIG. 5 is a schematic structural diagram of an air curtain generator.
[0029] FIG. 6 is a schematic structural diagram of an air curtain supply box.
[0030] FIG. 7 is a side view of an air curtain supply box.
[0031] FIG. 8 is a state diagram of the present invention when used in a mine.
[0032] FIG. 1 shows an apparatus for forming a partially dust-free space for mining. The partially dust-free space includes a planar jet air curtain generation device 1 and a fresh air supply system 2. The planar jet air curtain generation device 1 includes an air curtain generator 1-1, an air supply duct 1-2, and an air curtain supply box 1-3. The air curtain generator 1-1 is of a tubular structure, an air exhaust groove 1-11 is formed on one side of the air curtain generator 1-1, and a plurality of deflector blades 1-12 are uniformly distributed in the air exhaust groove 1-11. Averticaljet air curtain is blown out of the air exhaust groove 1-11 of the air curtain generator 1-1. The air curtain is inclined outwards at an angle of 110 to 20° along a connecting line of the air curtain generator 1-1, and a plurality of air curtains hermetically connected end to end enclose a relatively closed dust-free space. The air curtain guides the air exhaust flow to form an annular air flow, to flow in a specific direction along the outside of the dust-free space. The fresh air supply system 2 is arranged above the dust-free space, to supplement fresh air into the dust-free space from top to bottom.
[0033] As shown in FIG. 1, the air curtain supply box 1-3 is connected to a top portion of the air curtain generator 1-1 through the air supply duct 1-2. The fresh air supply system 2 includes a fresh air supply box 2-1 and a short-range air duct assembly 2-2. One side of the fresh air supply box 2-1 is provided with an air inlet duct 2-3. Short-range air duct assemblies 2-2 with equal lengths are uniformly distributed on a bottom surface of the fresh air supply box 2-1. An air inlet end of the fresh air supply box 2-1 is connected to an air filter. The air curtain supply box 1-3 is mounted on a top portion of the fresh air supply box 2-1. The air curtain generator 1-1 is arranged below the fresh air supply box 2-1.
[0034] As shown in FIG. 1 and FIG. 5, the air curtain generator 1-1 has an open upper end and a closed lower, and the open end is connected to the air supply duct 1-2. The height of the air curtain generator 1-1 ranges from 1200 mm to 1800 mm. An inner diameter of a cross section is set in a range of 110 mm to 140 mm depending on the height of the air curtain generator 1-1. The length, the height, and the width of the air exhaust groove 1-11 are (1050 mm to 1650 mm) x 35 mm x 10 mm. The deflector blades 1-12 are uniformly distributed along the length of the air exhaust groove 1-11. The deflector blades 1-12 are spaced apart by 30 mm to 40 mm and are bent into an arc shape. An angle between an axial direction of the air curtain generator 1-1 and a tangent of the deflector blade 1-12 on a side close to a groove bottom of the air exhaust groove 1-11 is 450, and an angle between a horizontal direction and a tangent of the deflector blade 1-12 on a side close to a grove opening of the air exhaust groove 1-11 is 20 to 25°.
[0035] As shown in FIG. 6 and FIG. 7, an air flow speed at any position in the air curtain supply box 2-1 is not higher than 1/2 of an air flow speed in a main air supply duct of the air curtain generator 1-1. The air curtain supply box 2-1 supplies an air flow to the air curtain generator 1-1. A ventilator supplies air to the air curtain supply box 2-1. The air curtain supply box 2-1 uniformly distributes air to each air curtain generator 1-1. A size of the air curtain supply box 2-1 may be designed flexibly based on a device arrangement space.
[0036] The air filter is a commercial anti-static air filter, designed based on conventional ventilation. A filter flow rate is selected based on a fresh air supply volume. The air filter is mounted at a front end of the fresh air supply box 2-1 to provide clean air for the fresh air supply box 2-1.
[0037] As shown in FIG. 6 and FIG. 7, the fresh air supply box 2-1 covers a top portion of the dust-free space, and a short-range air duct assembly 2-2 is mounted on a bottom portion of the fresh air supply box 2-1, to provide an air flow for a short-range air duct 2-2. The short-range air duct 2-2 has a diameter of 20 mm, protruding outwards by 10 mm, an arrangement density of short-range air ducts 2-2 in the fresh air supply box 2-1 is 200 to 230 short-range air ducts 2-2 per square meter, and an air flow speed of the short-range air duct 2-2 is set to 4.2 m/s to 8.4 m/s. The fresh air supply box 2-1 is provided with an air inlet duct 2-3 on the top portion of the dust-free space, and the short-range air duct 2-2 serves as a fresh air outlet. A total volume of the fresh air supply box 2-1 is designed with a principle that a minimum internal air flow speed is not greater than 4 m/s, to ensure uniform air supply throughout the short-range air duct 2-2.
[0038] The short-range air duct assembly 2-2 is in a shape of a round tube, supplying air vertically from top to bottom, so that fresh air can be uniformly distributed across an entire cross section of the dust-free space after entering the dust-free space for a very short distance, thereby ensuring full coverage of the fresh air from top to bottom, which is a key step of achieving the dust-free space.
[0039] A working method for the partial dust-free space is shown in FIG. 2: The air curtain generator 1-1 is supplied with air by the air curtain supply box 2-1, to blow out a planar jet air curtain in a particular direction at the angle of 150 to 20 inclined outwards along the connection line of the air curtain generator 1-1, and the air curtains are connected end to end, to form the relatively closed space, to isolate a dusty air flow from an excavation roadway to a driver of a roadheader. Fresh air is uniformly supplied into the partially dust-free space from the short-range air duct assembly 2-2 above the partially dust-free space. An air curtain jet speed is 11.8 m/s to 16.5 m/s, and an air flow speed of the short-range air duct 2-2 is 4.2 m/s to 8.4 m/s. The partially dust-free space is capable of effectively controlling intrusion of a dusty approach air flow of a working surface into the space, and a dust content of air in the partially dust-free space is not greater than 2 mg/m3 when an approach air flow speed of the working surface is not greater than 2 m/s and a dust concentration does not exceed 500 mg/m3
, thereby effectively isolating a space where an operator is located without affecting the operator's vision.
[0040] During field work, the partial dust-free space works in a horizontal ambient air flow, and an air flow generated by the air curtain is to be blown by the ambient air flow and flows in a direction different from an original flow direction. Arrangement of a planar jet air curtain in a local space varies with magnitude of the ambient air flow, as shown in FIG. 2 to FIG. 4.
[0041] Implementation 1 When the ambient air flow is less than 0.5 m/s, blowing of the ambient air flow has relatively small impact on a cross flow air curtain. For example, four air curtain generators 1-1 are disposed. An air supply manner of the four air curtain generators 1-1 may be arranged in a clockwise rotation direction end to end to enclose a square space. An air curtain generated by a first air curtain generator A exactly blocks the approach air flow, and an air exhaust groove of the first air curtain generator A rotates outwards by 15 degrees to 20 degrees relative to a connection line between the first air curtain generator A and a second air curtain generator B, guiding the air flow to a side while blocking the approach air flow. Air supply volumes of the first air curtain generator A and a fourth air curtain generator D may be increased by 20% compared with those of the second air curtain generator B and a third air curtain generator C, to reduce impact of the approach air flow on the air curtain, as shown in FIG. 2.
[0042] Implementation 2 When the ambient air flow is 0 m/s to 1.0 m/s, arrangement of the air curtain generator 1-1 is determined according to a requirement of a mounting space in a roadheader. For example, four air curtain generators 1-1 are disposed. The four air curtain generators 1-1 are arranged in a shape of a square, so that air curtains generated by the four air curtain generators 1-1 are connected end to end. A first air curtain generator A is caused to exactly face the approach air flow, so that an air exhaust groove 1-11 of the first air curtain generator A has a particular angle with the approach air flow. For example, the first air curtain generator A is arranged at 45 to 15° to 20° clockwise with respect to a direction of the approach air flow, to guide the air flow to one side. Air supply volumes of air supply columns of a third air curtain generator C and a fourth air curtain generator D may be increased by 20% compared with those of the first air curtain generator A and a second air curtain generator B, to improve a reverse air flow against interference of the approach air flow, as shown in FIG. 3.
[0043] Implementation 3 When the ambient air flow is 1.0 m/s to 2.0 m/s, the ambient air flow has relatively great impact on an air curtain of the approach air flow. Similarly, four air curtain generators 1-1 are used as an example. A first air curtain generator A is arranged exactly facing the approach air flow. An air exhaust groove 1-11 of the first air curtain generator A is arranged at 45° to 15° to 20° clockwise with respect to a direction of the approach air flow. A third air curtain generator C, a fourth air curtain generator D, and the first air curtain generator A form an isosceles triangle arrangement. 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 located on a line connecting the first air curtain generator A and the third air curtain generator C, and an air exhaust groove 1-1 of the second air curtain generator 2 is arranged at 90 degrees with the air exhaust groove of the first air curtain generator A, guiding the approach air flow to two sides. A direction of an air exhaust groove 1-11 of the third air curtain generator C and that of an air exhaust groove 1-11 of the fourth air curtain generator D are symmetrically arranged, pointing to an extension line of a center line of the isosceles triangle, and opposite to a direction of the first air curtain generator A. Air supply volumes of the third air curtain generator C and the fourth air curtain generator D may be increased by 20% compared with air supply volumes of the air curtain generators A and B, to improve a reverse air flow against interference of the approach air flow, as shown in FIG. 4.
[0044] Combination forms of planarjet air curtains in a dust-free space may be selected depending on different air flow directions and sizes of mines according to the foregoing three cases.
Claims (10)
- What is claimed is: 1. An apparatus for forming a partially dust-free space for mining, wherein the partially dust-free space comprises a planar jet air curtain generation apparatus and a fresh air supply system, the planar jet air curtain generation apparatus comprises an air curtain generator, an air supply duct, and an air curtain supply box, the air curtain generator is of a tubular structure, an air exhaust groove is formed on one side of the air curtain generator, and a plurality of deflector blades are uniformly distributed in the air exhaust groove; a vertical jet air curtain is blown out of the air exhaust groove of the air curtain generator, the air curtain is inclined outwards at an angle of 150 to 20 along a connecting line of the air curtain generator, and a plurality of air curtains hermetically connected end to end enclose a relatively closed dust-free space; and the fresh air supply system is arranged above the dust-free space, to supplement fresh air into the dust-free space from top to bottom.
- 2. The apparatus for forming a partially dust-free space for mining according to claim 1, wherein the air curtain generation apparatus comprises at least four air curtain generators, each air curtain generator is vertically mounted, along a clockwise direction, an air curtain facing an approach air flow is a first air curtain, and the air curtains are arranged in rotation in a same direction, to form a closed polygon space.
- 3. The apparatus for forming a partially dust-free space for mining according to claim 2, wherein the first air curtain of the air curtain generator exactly faces an air exhaust flow.
- 4. The apparatus for forming a partially dust-free space for mining according to claim 2, wherein the first air curtain of the air curtain generator forms an angle of 45°, 15, or 20with the approach air flow.
- 5. The apparatus for forming a partially dust-free space for mining according to claim 1,wherein the air curtain generation apparatus comprises at least four air curtain generators,each air curtain generator is vertically mounted, air curtains facing an approach air floware a first air curtain and a second air curtain, an angle exists between the first air curtainand the second air curtain, leading the air flow to two sides, and a third air curtain and afourth air curtain to an Nth air curtain follow the first air curtain and the second air curtain,to finally enclose a closed dust-free space.
- 6. The apparatus for forming a partially dust-free space for mining according to claim 1,wherein the air curtain supply box is connected to a top portion of the air curtaingenerator through the air supply duct; and an air flow speed at any position in the aircurtain supply box is not higher than 1/2 of an air flow speed in a main air supply duct ofthe air curtain generator.
- 7. The apparatus for forming a partially dust-free space for mining according to claim 1,wherein the air curtain generator has an open upper end and a closed lower end, and theopen end is connected to the air supply duct; the height of the air curtain generator rangesfrom 1200 mm to 1800 mm, and an inner diameter of a cross section is set in a range of110 mm to 140 mm depending on the height of the air curtain generator; the length, theheight, and the width of the air exhaust groove are (1050 mm to 1650 mm) x 35 mm x 10mm; the deflector blades are uniformly distributed along the length of the air exhaustgroove, the deflector blades are spaced apart by 30 mm to 40 mm and are bent into an arcshape, an angle between an axial direction of the air curtain generator and a tangent of thedeflector blade on a side close to a groove bottom of the air exhaust groove is 45, and anangle between a horizontal direction and a tangent of the deflector blade on a side closeto a groove opening of the air exhaust groove is 20° to 25°.
- 8. The apparatus for forming the partially dust-free space for mining according to claim 1,wherein the fresh air supply system comprises a fresh air supply box and a short-range airduct assembly, one side of the fresh air supply box is provided with an air inlet duct,short-range air duct assemblies with equal lengths are uniformly distributed on a bottomsurface of the fresh air supply box, and an air inlet end of the fresh air supply box isconnected to an air filter; and the air curtain supply box is mounted on a top portion ofthe fresh air supply box, and the air curtain generator is arranged below the fresh airsupply box.
- 9. The apparatus for forming a partially dust-free space for mining according to claim 1,wherein the fresh air supply box covers a top portion of the dust-free space, a short-rangeair duct assembly is mounted on a bottom portion of the fresh air supply box, to providean air flow for a short-range air duct; the short-range air duct has a diameter of 20 mm,protruding outwards by 10 mm, an arrangement density of short-range air ducts in thefresh air supply box is 200 to 230 short-range air ducts per square meter, and an air flowspeed of the short-range air duct is set to 4.2 m/s to 8.4 m/s; the fresh air supply box isprovided with an air inlet on the top portion of the dust-free space, and the short-range airduct serves as a fresh air outlet; a total volume of the fresh air supply box is designedwith a principle that a minimum internal air flow speed is not greater than 4 m/s, toensure uniform air supply throughout the short-range air duct.
- 10. The apparatus according to any one of claims I to 9, wherein a working method of thepartially dust-free space is that: the air curtain generator is supplied with air by the aircurtain supply box, to blow out a planar jet air curtain in a particular direction at the angleof 15° to 20° inclined outwards along the connection line of the air curtain generator, andthe air curtains are connected end to end, to form the relatively closed space, to isolate a dusty air flow from an excavation roadway to a driver of a roadheader; fresh air is uniformly supplied into the partially dust-free space from the short-range air duct assembly above the partially dust-free space; an air curtain jet speed is 11.8 m/s to 16.5 m/s, and an air flow speed of the short-range air duct is 4.2 m/s to 8.4 m/s; the partially dust-free space is capable of effectively controlling intrusion of a dusty approach air flow of a working surface into the space, and a dust content of air in the partially dust-free space is not greater than 2 mg/m3 when an approach air flow speed of the working surface is not greater than 2 m/s and a dust concentration does not exceed 500 mg/m 3; thereby effectively isolating a space where an operator is located without affecting the operator's vision.
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| CN202010070207.1 | 2020-01-21 | ||
| CN202010070207.1A CN111119976B (en) | 2020-01-21 | 2020-01-21 | Device and method for forming mining local dust-free space |
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| AU2020104462A4 true AU2020104462A4 (en) | 2021-10-14 |
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| CN111119976B (en) * | 2020-01-21 | 2024-05-24 | 中国矿业大学 | Device and method for forming mining local dust-free space |
| CN111700759B (en) * | 2020-06-24 | 2021-04-09 | 中南大学 | Oxygen enrichment device and method for high-altitude mine driving face |
| CN112682085B (en) * | 2020-12-12 | 2022-12-20 | 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 |
| CN113713932A (en) * | 2021-08-19 | 2021-11-30 | 萍乡泽昊新材料有限责任公司 | A reducing mechanism for old and useless material recovery |
| CN114320431B (en) * | 2021-11-26 | 2023-12-15 | 煤炭科学技术研究院有限公司 | High-efficient dust-proof air curtain for tunneling surface |
| CN114414279B (en) * | 2022-01-18 | 2024-01-26 | 山东科技大学 | Test method for service performance of foam dust settling device for underground coal mine and tunnel |
| CN114754406A (en) * | 2022-03-28 | 2022-07-15 | 安徽省宁国市天成科技发展有限公司 | Ring PTC heater |
| CN115253536A (en) * | 2022-04-18 | 2022-11-01 | 陕煤集团神木红柳林矿业有限公司 | Preparation method of dust-free space under mine |
| CN115012350A (en) * | 2022-06-28 | 2022-09-06 | 中国矿业大学 | Mine road surface dust removal vehicle |
| CN116084937B (en) * | 2023-03-09 | 2023-07-04 | 中国矿业大学 | Low-noise air curtain dust blocking device for driver position of heading machine |
| CN117432407B (en) * | 2023-10-19 | 2024-05-17 | 山东科技大学 | Water-saving environment-friendly tunneling machine |
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| EP0940526A1 (en) * | 1998-03-03 | 1999-09-08 | Michele Boni | Structural cell defined by air walls and architectural structure obtained with a plurality of said cells |
| CN200952406Y (en) * | 2006-09-18 | 2007-09-26 | 中国药品生物制品检定所 | Blocking frame ventilating and dust removing equipment |
| CN106288126A (en) * | 2016-10-26 | 2017-01-04 | 广东绿岛风室内空气系统科技有限公司 | A kind of double air outlet air curtain |
| CN107355252A (en) * | 2017-08-23 | 2017-11-17 | 黑龙江工业学院 | A kind of fully mechanized workface air curtain dust-collecting dedusting system |
| CN108626837A (en) * | 2018-03-05 | 2018-10-09 | 中国矿业大学 | A kind of pillar balanced ventilation device and method |
| CN109985883A (en) * | 2019-03-01 | 2019-07-09 | 中国矿业大学 | A kind of soft seal dust control device and method |
| CN209630805U (en) * | 2019-03-13 | 2019-11-15 | 河南农大园科技有限公司 | Feed Manufacturing dust removal system for workshop |
| CN211851887U (en) * | 2020-01-21 | 2020-11-03 | 中国矿业大学 | Device for forming local dust-free space for mine |
| CN111119976B (en) * | 2020-01-21 | 2024-05-24 | 中国矿业大学 | Device and method for forming mining local dust-free space |
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| WO2021147644A1 (en) | 2021-07-29 |
| CN111119976B (en) | 2024-05-24 |
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