CN112796819A - Ventilation, dust removal and cooling combined system for underground mine roadway excavation - Google Patents
Ventilation, dust removal and cooling combined system for underground mine roadway excavation Download PDFInfo
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- 239000000428 dust Substances 0.000 title claims abstract description 83
- 238000009423 ventilation Methods 0.000 title claims abstract description 81
- 238000001816 cooling Methods 0.000 title claims abstract description 68
- 238000009412 basement excavation Methods 0.000 title claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 117
- 230000005641 tunneling Effects 0.000 claims abstract description 74
- 238000009413 insulation Methods 0.000 claims abstract description 51
- 239000011435 rock Substances 0.000 claims abstract description 16
- 238000003825 pressing Methods 0.000 claims abstract description 14
- 238000005507 spraying Methods 0.000 claims abstract description 11
- 239000007921 spray Substances 0.000 claims abstract description 9
- 238000012546 transfer Methods 0.000 claims abstract description 9
- 239000002131 composite material Substances 0.000 claims abstract description 5
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- 229910052895 riebeckite Inorganic materials 0.000 claims description 2
- 239000011810 insulating material Substances 0.000 claims 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
- E21F3/00—Cooling or drying of air
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
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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
- E21F1/006—Ventilation at the working face of galleries or tunnels
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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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- 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
- E21F1/08—Ventilation arrangements in connection with air ducts, e.g. arrangements for mounting ventilators
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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
- E21F5/02—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires by wetting or spraying
- E21F5/04—Spraying barriers
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Abstract
The invention discloses a ventilation, dust removal and cooling combined system for underground mine roadway excavation, which is formed by combining a heat insulation layer, a local ventilation unit, a water supply unit and a spray dust removal and cooling unit. The heat insulation layer and an air layer (2) between the heat insulation layer and surrounding rocks of the excavation roadway (15) form a composite heat transfer structure; the local ventilation unit comprises a wind pressing fan (12-1), a wind pressing barrel (3), an air draft fan (12-2) and an air draft barrel (4); the water supply unit comprises a water pump (5), an electric valve (6), a Y-shaped filter (7) and a water supply pipe (8); the spray dedusting and cooling unit comprises a vertical water pipe (10) and a spraying device, water mist sprayed downwards by an atomizing nozzle forms a water curtain above a tunneling working surface (14), and ventilation air flow of the local ventilation unit performs heat and humidity exchange with the water curtain. The invention has the advantages of simple structure, reliable operation, strong practicability, good ventilation, dust removal and cooling effects and the like.
Description
Technical Field
The invention belongs to the technical field of ventilation, dust removal and cooling of underground mines, and particularly relates to a ventilation, dust removal and cooling system for an underground mine tunneling roadway, which is suitable for treating dust and heat damage of the underground mine tunneling roadway, can effectively reduce the dust concentration of the underground mine tunneling roadway and the temperature of an operation surface, and is particularly suitable for tunneling deep underground metal mine roadways.
Background
As the underground mine exploitation in China extends to the deep part, the number of deep wells and mines is increasing. Dust and high-temperature hazards in the process of deep well mining become prominent problems which restrict the safety, environment and occupational health of mine production. The driving face is one of the important working sites of a mine and is a typical site where unorganized dust and thermal damage are most serious underground. Along with the continuous increase of the mining depth of the mine, the ground temperature rises, the heat release of the surrounding rock increases, according to field investigation and actual measurement, the heat release of the surrounding rock of the roadway accounts for more than 60% of the heat release of the mine, and along with the increase of the mining depth and the mining age, the heat release proportion of the surrounding rock of the roadway is continuously improved. The tunneling working face cannot form effective through air flow, ventilation is not smooth, dust is easy to accumulate, and the temperature of the working face is high. If no effective measures are taken, the situation that the concentration of dust and the air temperature in the tunneling roadway are too high is more serious, the body health of underground workers is damaged, the productivity is reduced, even the tunneling working face cannot work, and the problems of dust and high-temperature harm of the deep-well tunneling roadway are urgently solved.
At present, no effective dust purification measures are provided for underground mine tunneling roadways in China, and the following two modes are mainly adopted. (1) Wet operation: the method is simplest and low in cost, but the dust removal efficiency is low and is only 30-50%, because the wet operation mainly sends water mist with certain pressure into the drilled hole to wet dust in the drilled hole and cannot adsorb dust which is not wetted and dissipated into the air; (2) mechanical dust removal: the mechanical dust removing device mainly comprises a dry dust removing device and a wet dust removing device, and the dust removing efficiency of the method can reach more than 80-90 percent, but the cost is high.
The mine cooling measures mainly comprise non-artificial cooling and artificial cooling. The artificial refrigeration cooling mainly comprises an artificial refrigeration water cooling technology, an artificial ice making cooling technology and an air compression type refrigeration technology, but any artificial refrigeration cooling mode has large investment, large energy consumption and high operating cost. The non-artificial refrigeration cooling is mainly ventilation cooling, but through a simulation excavation roadway cooling test, the ventilation cooling and the increase of air volume cooling are found, the temperature in the excavation roadway can not be reduced after being reduced to a certain degree, and the increase of the air volume is also limited by the specified air speed and the capacity of ventilation equipment, so that the ventilation cooling is not economical.
The optimization of a deep-well mining large-scale gold mine refrigeration cooling system published in gold 2019, 12 of Chinese journal is introduced: when the occurrence depth of a certain planned large-scale gold mine body is 1400m, the rock temperature is as high as 42.63 ℃, the thermal injury is serious, and a multistage machine station ventilation system is adopted. In order to solve the problem of high-temperature heat damage in deep mining, two schemes of a ground centralized air-cooling system and an underground centralized water-cooling system are provided, and finally the underground centralized water-cooling system is selected. By adopting the scheme, the air cooler can be started and the cold output can be controlled according to the excavation requirement by combining with the ventilation system according to the requirement, so that the aims of saving energy and reducing consumption can be fulfilled. The 'application research of deep well refrigeration and ventilation technology in gold mine' published in 4 months in 2020 of world nonferrous metals indicates that: the controllable circulation ventilation and air purification combined technology is utilized, part of dirty air is mixed with fresh air flow after being purified and treated, the problem of difficult ventilation in the gold mine deep well can be effectively solved, the underground operation environment of the mine is very complex, the problem of underground cooling and ventilation can be solved by utilizing a certain single cooling technology or ventilation technology, the problem can be solved by adopting a combination mode of different refrigeration and ventilation technologies according to the actual underground condition, and a cooling scheme of 'cooling by taking water as a secondary refrigerant and performing circulation cooling and refrigeration through waste mine water' is provided. However, the two deep well cooling schemes need to search for underground cold sources (such as low-temperature water burst of mines), and many underground mines do not have implementation conditions.
Generally speaking, no effective and practical ventilation, dust removal and cooling combined system which has good ventilation, dust removal and cooling effects and low energy consumption for ventilation and cooling, integrates the functions of ventilation, dust removal and cooling and is applied to metal mine tunneling roadways exists at present.
Disclosure of Invention
The invention aims to provide a ventilation, dust removal and cooling combined system for underground mine roadway tunneling, which is simple in operation, reliable in operation and strong in practicability, aiming at the problems of poor ventilation, dust removal and cooling effects, high ventilation and cooling energy consumption and the like of underground mine roadway tunneling.
In order to realize the aim, the ventilation, dust removal and cooling combined system for underground mine roadway excavation adopts the following technical scheme:
the invention relates to a ventilation, dust removal and cooling combined system for underground mine roadway excavation, which is formed by organically combining a heat insulation layer, a local ventilation unit, a water supply unit and a spray dust removal and cooling unit:
(1) thermal insulation layer
The heat insulation layer is of a tunnel-shaped structure with two closed sides and upper part and an open end and matched with the tunneling tunnel, the heat insulation layer is arranged along the length direction of the tunneling tunnel, the distance between the outer wall surface of the heat insulation layer and the peripheral wall surface of the tunneling tunnel is 0.2-0.3 m, the vertical distance between the inner end part of the heat insulation layer and the tunneling working surface is 4.0-6.0 m, preferably 4.5-5.5 m, and preferably 5.0 m; the heat insulating layer and an air layer between the heat insulating layer and the surrounding rock of the excavation roadway form a composite heat transfer structure.
The thickness of the heat insulation layer is 0.1-0.2 m, the heat insulation layer is made of heat insulation materials with good heat insulation performance and certain strength, the heat insulation layers are generally assembled by low-price heat insulation boards sold in the market, and the heat insulation layer can also be made of glass fibers, glass wool, rock wool, asbestos and centrifugal glass fiber cotton materials, such as rock wool boards and centrifugal glass fiber cotton boards, and the centrifugal glass fiber cotton materials are preferably used, so that the heat insulation effect is good, and the price is low.
(2) Local ventilation unit
The local ventilation unit comprises a pressure air fan, a pressure air cylinder, an air draft fan and an air draft cylinder; the air pressing barrel is arranged below the top of the central position of the heat insulation layer, the air pressing fan is arranged on the side surface of the middle section main roadway, and the air pressing fan is connected with the air inlet end of the air pressing barrel; the exhaust fans and the exhaust barrel are arranged in two groups and are respectively arranged along two side surfaces of the heat insulation layer, and the exhaust fans are connected with the air outlet end of the exhaust barrel.
(3) Water supply unit
The water supply unit comprises a water pump, an electric valve, a Y-shaped filter and a water supply pipe; the water supply pipe is arranged along the inner side wall of the middle section large roadway and the driving roadway, and the water pump, the electric valve and the Y-shaped filter are sequentially arranged on the water supply pipe in the middle section large roadway.
The distance between adjacent atomizing nozzles arranged on the transverse water pipe is 400-600 mm; the water source of the water supply pipe is from a water sump which takes mine water burst as a natural cold source.
(4) Spray dust removal cooling unit
The spraying, dust removing and cooling unit comprises a vertical water pipe and a spraying device, the spraying device is composed of a transverse water pipe hung on a top plate of a tunneling roadway along the width direction and a plurality of atomizing nozzles arranged on the transverse water pipe, the transverse water pipe is positioned on a tunneling working surface, and the transverse water pipe is connected with a water supply pipe of the water supply unit through the vertical water pipe.
The water mist sprayed downwards from the atomizing nozzle of the spray dust removal cooling unit forms a water curtain above the tunneling working face to completely seal dust generated by the tunneling working face; the ventilation air flow generated by the local ventilation unit is in heat and moisture exchange with the water curtain.
Furthermore, a dust sensor is respectively arranged on the two side walls of the tunneling roadway which are 1-2 meters away from the tunneling working surface, and the arrangement height is preferably controlled within the range of 1.45-1.55 meters.
The traditional local ventilation system for the excavation roadway discharges dust generated by the excavation working face only through a ventilation and dust discharge technical means, the pollution problem of underground dust is not fundamentally solved, meanwhile, the ventilation and cooling effect is not obvious, and the larger the ventilation quantity is, the better the cooling effect is. The increase of the ventilation quantity of the local ventilation system and the corresponding increase of the energy consumption of the ventilation system and the like cause the increase of the wind speed, the flying of dust and the negative influence on the working environment.
Compared with the traditional local ventilation system for the excavation roadway, the ventilation, dust removal and cooling combined system for the excavation of the underground mine roadway has the following positive effects after adopting the technical scheme:
(1) the ventilation, dust removal and cooling combined system adopts a combined cooling method of heat release control of a heat source and precooling ventilation airflow for roadway surrounding rock heat insulation, and achieves double heat insulation and cooling effects on the heat source and the environment. The field test result shows that the cooling effect is very obvious, and the temperature of the air in the driving tunnel is reduced to more than 5 ℃.
(2) A row of atomizing nozzles are arranged at the top of a roadway above a driving face, water sources come from mine water burst, the atomizing nozzles form a water curtain on the driving face, dust generated in the driving roadway is captured and purified in situ in real time, and meanwhile, the water curtain and local ventilation air flow perform heat and humidity exchange, so that the environment cooling effect of the driving face is realized. The field test result shows that the dust removal efficiency of the system reaches more than 91%.
(3) The process flow is simple, and real-time cooling and dust removal can be realized by arranging the control system.
Drawings
FIG. 1 is a schematic plan view of a combined ventilation, dust removal and temperature reduction system for underground mine roadway excavation according to the present invention;
FIG. 2 is a schematic view of a partially enlarged plane of a tunneling working face of the ventilation, dust removal and cooling combined system for tunneling an underground mine roadway, according to the invention;
FIG. 3 is a schematic diagram of the arrangement of a surrounding rock heat-insulating layer of a tunneling roadway of the ventilation, dust removal and temperature reduction combined system for tunneling an underground mine roadway;
fig. 4 is a schematic layout of the heading tunnel spraying device adopted by the invention.
The reference signs are: 1-a heat insulation layer; 2-an air layer; 3-pressing an air cylinder; 4-a draught tube; 5, a water pump; 6-an electric valve; a 7-Y type filter; 8-a water supply pipe; 9-a transverse water pipe; 10-a vertical water pipe; 11-an atomizing nozzle; 12-1-forced air blower; 12-2-air draft fan; 13-a dust sensor; 14-tunneling a working face; 15-tunneling a roadway; 16-middle section main lane.
Detailed Description
In order to better describe the invention, the ventilation, dust removal and temperature reduction combined system for underground mine roadway excavation is further described in detail below with reference to the accompanying drawings.
The schematic plan structure of the combined ventilation, dust removal and cooling system for underground mine tunneling of the invention shown in fig. 1 is combined with fig. 2, 3 and 4, and the combined ventilation, dust removal and cooling system for underground mine tunneling of the invention is composed of a heat insulation layer 1, a local ventilation unit, a water supply unit and a spray dust removal and cooling unit:
the heat insulation layer 1 is of a tunnel-shaped structure with two closed sides and upper part and open end and matched with the excavation tunnel 15, the heat insulation layer 1 is arranged along the length direction of the excavation tunnel 15, the outer wall surface of the heat insulation layer 1 is 0.2m away from the peripheral wall surface of the excavation tunnel 15, and the vertical distance between the inner end part of the heat insulation layer 1 and the excavation working surface 14 is 5.0 m; the heat insulation layer 1 and an air layer 2 between the heat insulation layer and surrounding rocks of the excavation roadway 15 form a composite heat transfer structure; the thickness of the heat insulation layer 1 is 0.1-0.2 m, and the heat insulation layer is made of a heat insulation material with good heat insulation performance and certain strength.
The local ventilation unit comprises a pressure fan 12-1, a pressure fan drum 3, an air draft fan 12-2 and an air draft drum 4; the compressed air cylinder 3 is arranged below the top of the central position of the heat insulation layer 1, the compressed air fan 12-1 is arranged on the side surface of the middle section main roadway 16, and the compressed air fan 12-1 is connected with the air inlet end of the compressed air cylinder 3; the two groups of the exhaust fans 12-2 and the exhaust cylinders 4 are respectively arranged along the two side surfaces of the heat insulation layer 1, and the exhaust fans 12-2 are connected with the air outlet ends of the exhaust cylinders 4;
the water supply unit comprises a water pump 5, an electric valve 6, a Y-shaped filter 7 and a water supply pipe 8; the water supply pipe 8 is arranged along the inner side walls of the middle section large roadway 16 and the tunneling roadway 15, and the water pump 5, the electric valve 6 and the Y-shaped filter 7 are sequentially arranged on the water supply pipe 8 in the middle section large roadway 16; the distance between the adjacent atomizing nozzles 11 arranged on the transverse water pipe 9 is 400-600 mm. And respectively installing a dust sensor 13 at the position of two side walls of a tunneling roadway 15 which is about 1-2 meters away from the tunneling working surface 14, and controlling the laying height to be within the range of 1.45-1.55 meters.
The spraying, dust removing and cooling unit comprises a vertical water pipe 10 and a spraying device, the spraying device consists of a transverse water pipe 9 hung on a top plate of a driving roadway 15 along the width direction and a plurality of atomizing nozzles 11 arranged on the transverse water pipe 9, the transverse water pipe 9 is positioned on a driving working surface 14, and the transverse water pipe 9 is connected with a water supply pipe 8 of a water supply unit through the vertical water pipe 10; the water source of the water supply pipe 8 is from a water sump which takes mine water as a natural cold source.
The water mist sprayed downwards from the atomizing nozzle 11 of the spray dust removal cooling unit forms a water curtain above the tunneling working face 14 to completely seal dust generated by the tunneling working face 14; the ventilation air flow generated by the local ventilation unit is in heat and moisture exchange with the water curtain.
In order to solve the problem of heat dissipation of surrounding rocks of the driving roadway 15, the invention adopts two cooling methods of controlling a heat source and precooling ventilation airflow. Firstly, a heat insulation layer 1 which is similar to the roadway in shape and is sealed at the periphery is arranged at a certain distance from the surrounding walls of the driving face 14 and the driving roadway 15, the heat insulation layer 1, the surrounding rocks of the driving roadway 15 and an air layer 2 between the surrounding rocks form a composite heat transfer structure, the heat transfer structure is of a series connection structure, the heat transfer thermal resistance of the heat transfer structure can be increased, the heat dissipation quantity of the surrounding rocks of the driving roadway 15 to a space is greatly reduced, the heat-moisture exchange between the air around the surrounding rocks of the driving roadway 15 and the air in the space and the radiation heat transfer between human bodies, equipment and the like in the driving roadway 15 are blocked, and. Secondly, ventilation air flow in the upper air side of the middle section main roadway 16 is sent into the tunneling roadway 15 through the pressure air fan 12-1 and the pressure air cylinder 3, the pressure air cylinder 3 is arranged at the center of the top of the tunneling roadway 15, fresh air flow flows out from the outlet of the pressure air cylinder 3 and then flows downwards along the front left and right direction through the tunneling working face 14 under the action of kinetic energy and gravitational potential energy, heat and moisture exchange is carried out between the fresh air flow and a water curtain above the tunneling working face 14, the mine water inflow temperature is low and is generally about 28 ℃, the fresh air flow serves as a cooling water source for good ventilation air flow of the tunneling roadway 15, the ventilation air flow is cooled, the cooled air flow then enters the air draft cylinders 4 arranged on the two side wall surfaces of the tunneling roadway 15, and air flows in the two air draft cylinders 4 are discharged into the lower air side of the middle section.
The air flow pressed in by the air pressing barrel 3 freely jets into the area of the driving face 14, so that jet resistance of an attached wall with the wall surface of the driving tunnel 15 does not exist, and resistance loss of a ventilation system is reduced; meanwhile, the air draft cylinders 4 arranged on the two side wall surfaces of the tunneling roadway 15 keep the air flow in the tunneling roadway 15 in balanced distribution, the purified air flow is reliably led into the air draft cylinders 4 from the tunneling working surface 14 under the condition of no adverse vortex or other influences, and the air flow utilization rate of the ventilation system is effectively improved. The water supply pipe 8 is connected with a water sump which takes the mine water burst as a natural cold source, a water source is sequentially led into the water pump 5, the electric valve 6 and the Y-shaped filter 7, and then water is sent into the transverse water pipe 9 through the vertical water pipe 10. The two ends of the transverse water pipe 9 are closed, water in the transverse water pipe 9 is sprayed out from the atomizing nozzles 11, and the downward sprayed water mist forms a closed water curtain above the tunneling working surface 14 to purify dust generated by the tunneling working surface 14. And the dust concentration of the tunneling working surface 14 is detected according to the dust sensor 13, and the automatic start and stop of the water pump 5 and the fan 12 are controlled, so that real-time ventilation and dust removal are realized.
Example (b):
a horizontal height of-800 m under a metal mine is 2.5m, a width is 3.7m and a length is 50m, a long-pressure short-suction ventilation system is adopted, a pressure air cylinder and a suction air cylinder are respectively arranged on two side wall surfaces of a tunneling roadway, the diameter of the air cylinder is 0.5m, and the distances between the air cylinder and a tunneling working surface are respectively 20m and 10 m. The dust concentration and the temperature of the excavation roadway are actually measured on site, the dust concentration of the excavation roadway is reduced along with the increase of the distance from the excavation face on the whole until the dust concentration tends to be stable, and the dust concentration range is 31.5-222.5 mg/m3The temperature of the driving face exceeds 30 ℃, and the highest temperature is 35 ℃.
On the basis that the air quantity of an original long-pressure short-suction hybrid ventilation system of the tunneling roadway and the local fan are unchanged, the position of an original pressure air cylinder is changed, the original air suction cylinder is removed, two air suction cylinders with the diameter of about 0.35m are arranged, the distance between the pressure air cylinder and the air suction cylinder and the tunneling working face is still kept unchanged, meanwhile, a heat insulation layer of the peripheral wall of the tunneling roadway is additionally arranged, the thickness of the heat insulation layer is 0.1m, the distance between the heat insulation layer and a rock wall is designed to be 0.2m, and the distance between the whole heat insulation layer and the section of the. The water supply pipe of the water supply system adopts a steel pipe with the nominal diameter of 15mm, the water supply pressure is 2.5Mpa, and the water source is from a horizontal water sump with the middle section of minus 800m and the water gushing from the mine as a natural cold source. According to the section size of the tunneling roadway, a transverse water pipe with the nominal diameter of 15mm is installed at the top of the tunneling working face along the width direction of the tunneling roadway, and 7 atomizing nozzles are welded at intervals of 500mm in the vertical downward direction of the transverse water pipe according to the width of the tunneling roadway.
The dust concentration of each sampling point under the same operation condition before and after the excavation roadway ventilation, dust removal and cooling system is applied to be respectively sampled and detected, and the detection result is shown in table 1.
TABLE 1 detection result of dust concentration in driving tunnel
The measurement data in the table 1 show that after the system for ventilating, dedusting and cooling the excavation roadway is applied, the dust concentration is obviously reduced, and the dust concentration of the excavation roadway is 31.5-222.5 mg/m before modification3Reduced to 2.5-12.7 mg/m3The dust removal efficiency reaches more than 91 percent, and the working environment of the tunneling working face is greatly improved.
After the ventilation, dust removal and cooling system for the excavation roadway is installed on the excavation roadway, the air temperature of the excavation roadway is actually measured, the air temperature in the roadway is at most 26.5 ℃, and the cooling effect is very obvious.
Claims (7)
1. The utility model provides a ventilation dust removal and cooling combined system of underground mine tunnelling usefulness which characterized in that is then by insulating layer (1), local ventilation unit, water supply unit, the combination of spray dust removal cooling unit and constitutes:
the heat insulation layer (1) is of a roadway-shaped structure with two closed sides and upper part and an open end and is matched with the tunneling roadway (15), the heat insulation layer (1) is arranged along the length direction of the tunneling roadway (15), the distance from the outer wall surface of the heat insulation layer (1) to the peripheral wall surface of the tunneling roadway (15) is 0.2-0.3 m, and the vertical distance from the inner end part of the heat insulation layer (1) to the tunneling working surface (14) is 4.0-6.0 m; the heat insulation layer (1) and an air layer (2) between the heat insulation layer and surrounding rocks of the excavation roadway (15) form a composite heat transfer structure;
the local ventilation unit comprises a wind pressing fan (12-1), a wind pressing barrel (3), an air extracting fan (12-2) and an air extracting barrel (4); the air pressing barrel (3) is arranged below the top of the central position of the heat insulation layer (1), the air pressing fan (12-1) is arranged on the side surface of the middle section main roadway (16), and the air pressing fan (12-1) is connected with the air inlet end of the air pressing barrel (3); the two groups of the exhaust fans (12-2) and the exhaust barrel (4) are respectively arranged along two side surfaces of the heat insulation layer (1), and the exhaust fans (12-2) are connected with the air outlet end of the exhaust barrel (4);
the water supply unit comprises a water pump (5), an electric valve (6), a Y-shaped filter (7) and a water supply pipe (8); the water supply pipe (8) is arranged along the inner side walls of the middle section large roadway (16) and the tunneling roadway (15), and the water pump (5), the electric valve (6) and the Y-shaped filter (7) are sequentially arranged on the water supply pipe (8) in the middle section large roadway (16);
the spraying, dedusting and cooling unit comprises a vertical water pipe (10) and a spraying device, the spraying device is composed of a transverse water pipe (9) hung on a top plate of a tunneling roadway (15) along the width direction and a plurality of atomizing nozzles (11) arranged on the transverse water pipe (9), the transverse water pipe (9) is positioned on a tunneling working surface (14), and the transverse water pipe (9) is connected with a water supply pipe (8) of a water supply unit through the vertical water pipe (10);
the water fog sprayed downwards by the atomizing nozzle (11) of the spray dust removal cooling unit forms a water curtain above the tunneling working surface (14) to completely seal dust generated by the tunneling working surface (14); the ventilation air flow generated by the local ventilation unit is in heat and moisture exchange with the water curtain.
2. The ventilation, dust removal and temperature reduction combined system for underground mine tunneling according to claim 1, characterized in that: and (3) respectively installing a dust sensor (13) at the position of two side walls of a tunneling roadway (15) which is 1-2 meters away from the tunneling working surface (14), and controlling the laying height to be within the range of 1.45-1.55 meters.
3. The combined ventilation, dust removal and temperature reduction system for underground mine tunneling according to claim 2, characterized in that: the thickness of the heat insulation layer (1) is 0.1-0.2 m, and the heat insulation layer is made of heat insulation materials with good heat insulation performance and certain strength.
4. The ventilation, dust removal and temperature reduction combined system for underground mine tunneling according to claim 3, characterized in that: the heat insulating material is one of glass fiber, glass wool, rock wool, asbestos and centrifugal glass fiber cotton.
5. The combined ventilation, dust removal and temperature reduction system for underground mine tunneling according to claim 1, 2, 3 or 4, wherein: the distance between the adjacent atomizing nozzles (11) arranged on the transverse water pipe (9) is 400-600 mm.
6. The ventilation, dust removal and temperature reduction combined system for underground mine tunneling according to claim 5, characterized in that: the water supply system is also provided with a water bin, and the water source of the water supply pipe (8) is from the water bin which takes the mine water burst as a natural cold source.
7. The ventilation, dust removal and temperature reduction combined system for underground mine tunneling according to claim 6, characterized in that: the vertical distance between the inner end part of the heat insulation layer (1) and the tunneling working face (14) is 4.5-5.5 m.
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Application publication date: 20210514 |