LU102355B1 - Liquid nitrogen mist and water mist linked dust falling method for fully mechanized excavation face - Google Patents
Liquid nitrogen mist and water mist linked dust falling method for fully mechanized excavation face Download PDFInfo
- Publication number
- LU102355B1 LU102355B1 LU102355A LU102355A LU102355B1 LU 102355 B1 LU102355 B1 LU 102355B1 LU 102355 A LU102355 A LU 102355A LU 102355 A LU102355 A LU 102355A LU 102355 B1 LU102355 B1 LU 102355B1
- Authority
- LU
- Luxembourg
- Prior art keywords
- liquid nitrogen
- dust
- water spray
- spray
- fine water
- Prior art date
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 318
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 204
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 159
- 239000007788 liquid Substances 0.000 title claims abstract description 154
- 239000000428 dust Substances 0.000 title claims abstract description 140
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000009412 basement excavation Methods 0.000 title claims abstract description 13
- 239000003595 mist Substances 0.000 title description 7
- 239000007921 spray Substances 0.000 claims abstract description 284
- 230000005641 tunneling Effects 0.000 claims abstract description 98
- 239000003245 coal Substances 0.000 claims abstract description 15
- 239000007789 gas Substances 0.000 claims abstract description 13
- 239000011435 rock Substances 0.000 claims abstract description 12
- 238000009423 ventilation Methods 0.000 claims description 16
- 238000002347 injection Methods 0.000 claims description 13
- 239000007924 injection Substances 0.000 claims description 13
- 230000000903 blocking effect Effects 0.000 claims description 12
- 238000009833 condensation Methods 0.000 claims description 7
- 230000005494 condensation Effects 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 7
- 230000002265 prevention Effects 0.000 claims description 6
- 241000180579 Arca Species 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 9
- 238000004880 explosion Methods 0.000 abstract description 5
- 238000000889 atomisation Methods 0.000 description 3
- 239000002817 coal dust Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010410 dusting Methods 0.000 description 1
- 206010035653 pneumoconiosis Diseases 0.000 description 1
- 239000000243 solution Substances 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
- E21F5/02—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires by wetting or spraying
- E21F5/04—Spraying barriers
-
- 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
-
- 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
- E21F5/06—Fluids used for spraying
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Special Spraying Apparatus (AREA)
Abstract
The present invention discloses a liquid nitrogen spray and fine water spray linked dust falling method for a fully mechanized excavation face. Two air curtains are arranged between a tunneling face and a tunneling cab, so as to control dust to be within a tunneling space and prevent the dust from diffusing to an entire roadway; magnetized water is used to prepare fine water spray to reduce surface tension thereof, the fine water spray is combined with the dust to fall the dust, and meanwhile, under the low-temperature effect of liquid nitrogen spray drops, dust-containing water spray is condensed rapidly, thereby increasing a falling rate thereof, and a dust falling efficiency and a dust falling effect are effectively improved by means of secondary settling; by means of a dust guide system, the dust moves downward faster to guarantee rapid dust falling under linkage between the liquid nitrogen spray and the fine water spray, remaining dust may be removed, and a centrifugal fan may pump air out of the tunneling space and reduce a gas density in the tunneling space; and the fine water spray and the liquid nitrogen spray may wet and cool surrounding rock or a coal body to prevent gas and dust explosion accidents caused by sparks generated during coal and rock cutting.
Description
BL-5176 LU102355
TECHNICAL FIELD The present invention relates to a dust falling method for a fully mechanized excavation face. in particular to a liquid nitrogen mist and water mist linked dust falling method for a fully mechanized excavation face.
BACKGROUND OF THE APPLICATION A roadway fully mechanized excavation face is one of the main dust production sites in an underground coal mine, the dust production amount is large in a working process. a large amount of dust is suspended in air. resulting in reduction of visibility of the working face. large influences on normal roadway tunneling. and serious harm to body health of workers. and according to statistics. 83% or more of coal mine pneumoconiosis patients work on the fully mechanized excavation face of a rock roadway. In order to prevent and treat dust hazards of the fully mechanized excavation face of the underground roadway of a coal mine. an inside and outside spraying device of a heading machine. a coal seam water injection device, a dust removal fan and other devices are generally used at present. but the dust prevention and falling effect is not ideal due to limitations of the devices. For example. a coal sean water injection system and process are complex. water consumption is large. a large number of drill holes for injecting water is needed. the work amount is large. and cost is high: an inside and outside spraying nozzle is extremely prone to blockage. a dust falling efficiency is low. und a utilization rate of dust falling water is low: and in addition. the dust removal fan is short in effective suction distance. low in dust suction rate. and too large and heavy to move. and has electrical potential safety hazards. Besides. at present. an air curtain and dust removal fan linked dust falling method is provided. that is. dust gencrated by the fully mechanized excavation face is controlled within a certain range by means of an air curtain. and then the dust removal fan is used for collecting the dust in a closed area: and the method is a dry dust falling method. besides the defects of the dust removal fan. à dust density
BI-5176 and a gas density in the closed arca are relatively high, and once sparks are generated during Soul 0 es05 and rock cutting. coal dust. gas explosion and other major accidents arc casily induced.
Summary of the Invention: In view of the problems in the prior art. the present invention provides a liquid nitrogen mist and water mist linked dust falling method for a fully mechanized excavation face, which may control dust generated by a tunneling face within a small space. thercby guaranteeing air quality of a working environment of workers: and in addition, dust falling treatment on the dust and gas guiding treatment are carried out by means of cooperation among liquid nitrogen spray. fine water spray and gas guiding, thereby reducing a dust density and a gas density in the space, and finally the situation of dust explosion or gas explosion caused by sparks generated by the tunneling face is prevented.
For achieving the above objective. the present invention uses a technical solution of a liquid nitrogen spray and fine water spray linked dust falling method for a fully mechanized excavation face. which uses a fine water spray and liquid nitrogen spray linked system for dust falling. and comprises specific steps: A. a bottom-plate air curtain generator and a top-plate air curtain generator in the fine water spray and liquid nitrogen spray linked system are arranged between a tunneling face and a tunneling cab. wherein the bottom-plate air curtain generator is located on a bottom plate of a roadway and is 4.1-4.3 m away from the tunneling face: and the top-plate air curtain generator is located on a top plate of a roadway and is 3.8-4.0 m away from the tunneling face; B. a fine water spray straight nozzle in the fine water spray and liquid nitrogen spray linked system is arranged on a position 0.8-1.3 m away from the tunneling face and 0.3-0.6 m away from the top plate of the roadway. and a liquid nitrogen spray straight nozzle in the fine water spray and liquid nitrogen spray linked system is arranged on a position 1.5-2.0 m away from the tunncling face and 0.7-0.9 m awav from the top plate of the roadway. the fine water spray straight nozzle and the liquid nitrogen spray straight nozzle spraying fine water spray and liquid nitrogen spray being separately used for direct dust falling: C. a centrifugal fan in the fine water spray and liquid nitrogen spray linked system is "+
BL-3176 arranged on a position 5-5.5 m away from the tunneling face and 0.3-0.5 m away from the bottom 02355 plate of the roadway. the centrifugal fan matching a dust blocking screen by means of a negative pressure resistance pipe for guiding dust to fall; a liquid nitrogen spray downward nozzle in the fine water spray and liquid nitrogen spray linked system is arranged on a position 2.8-3.1 m away from the tunneling face and 0.6-0.8 m away from the bottom plate of the roadway, and a fine water spray downward nozzle in the fine water spray and liquid nitrogen spray linked system is arranged on a position 2.5-2.7 m away from the tunneling face and 0.9-1.1 m away from the bottom plate of the roadway, the fine water spray downward nozzle and the liquid nitrogen spray downward nozzle spraying fine water spray and liquid nitrogen spray being separately used for settling of the dust guided downward: and the dust blocking screen is arranged on a position
0.3-0.5 m away from the bottom plate of the roadway and 3.3-3.6 m away from the tunneling face: D. a pressure ventilation pipe in the {ine water spray and liquid nitrogen spray linked system is connected to a pressure ventilation system of the roadway: a magnetized water injection pipe in the finc water spray and liquid nitrogen spray linked system is connected to a magnetized water conveying system of the roadway; and 10-20 min before a heading machine starts to work, a third control valve is opened, and at the moment, the pressure ventilation system conveys high-pressure air flow into the pressure ventilation pipe. so as to start the top-plate air curtain generator and the bottom-plate air curtain generator to generate a first air curtain and a second air curtain respectively, a dust prevention buffer area being formed between the first air curtain and the second air curtain to control the dust, generated by the tunneling face, in a tunneling space: E. a second control valve is opened, magnetized water is injected into a fine water spray generator by means of the magnetized water injection pipe. a first control valve is opened and the fine water spray generator is started. at the moment. the fine water spray generator converts the magnetized water into the fine water spray. and then the fine water spray is distributed to a first fine water spray pipe and a second fine water spray pipe by means of a third fine water spray pipe and a second three-way valve and is sprayed into the tunneling space by means of the fine water spray straight nozzle and the fine water spray downward nozzle, the fine water spray generated by the fine water spray generator having a {low of 11-13 m/min and a diameter of less than 70 un;
BL-5176
F. meanwhile, a liquid nitrogen spray generator is started, the liquid nitrogen spray seneralon 02355
= > converts liquid nitrogen into the liquid nitrogen spray, a first liquid nitrogen control valve and a second liquid nitrogen control valve are opened in sequence. and the generated liquid nitrogen spray is distributed 10 a first liquid nitrogen pipe and a fourth liquid nitrogen pipe by means of a second liquid nitrogen pipe and a first three-way valve and is spraved into the tunneling space by means of the liquid nitrogen spray straight nozzle and the liquid nitrogen spray downward nozzle. the Hquid nitrogen spray generated by the liquid nitrogen spray generator has a flow of 20-30 L’min and a diameter of less than 250 um: and
G. the centrifugal fan is started. the centrifugal fan may provide negative pressure not less than 600 KPa and then generates the negative pressure at a lower portion of the tunneling space by means of the negative pressure resistance pipe. thereby guiding the suspended dust in the tunneling space downward. at the moment. part of the dust generated by the tunneling face is combined with the fine water spray to form dust-containing water spray to fall in the tunneling space under the action of gravity and guiding pressure. meanwhile, the liquid nitrogen spray makes contact with the dust-containing water spray in the falling process to make the dust-containing water spray rapidly fall and condense, after condensation, the dust-containing water spray falls faster until it reaches the bottom plate of the tunneling space. and a primary settling process is completed: the remaining dust not combined with the fine water spray moves to a lower portion of the tunneling face under the guiding action of the negative pressure. when passing through the fine water spray downward nozzle and the liquid nitrogen spray downward nozzle. this part of the dust is combined with the fine water spray sprayed by the fine water spray downward nozzle to form dust-containing water spray. the liquid nitrogen spray sprayed by the liquid nitrogen spray downward nozzle makes contact with the dust-containing water spray to make the dust-containing water spray rapidly fall and condense. after condensation, the dust-containing water spray falls faster until it reaches the bottom plate of the tunneling space. and a secondary settling process is completed: finally. under the condition that there still exists remaining non-falling dust, the remaining non-falling dust is adsorbed on the dust blocking screen under the action of the negative pressure. thereby achieving dust settling work in the tunneling space. and meanwhile. the centrifugal fan may pump air out of the tunneling space continuously and reduce a gas density in the tunneling space: and in addition. the fine water spray in the
1
BL-5176 tunneling space may wet and cool surrounding rock around the roadway or a coal body afar 05955 settled, so as to effectively reduce a possibility of generating sparks during coal and rock cutting in a tunneling process.
Compared with the prior art, the present invention uses the magnetized water to prepare the fine water spray lo greatly reduce surface tension of the dust falling water, which reinforces an atomization effect of the water. increases a contact area between a spray drop and coal dust and improves the dust falling effect. Meanwhile, under the low-temperature effect of the liquid nitrogen spray drops. the dust-containing water spray is condensed rapidly, a falling rate thereof is increased, and a dust falling efficiency and the dust falling effect are effectively improved by means of secondary settling. The two air curtains are arranged between the tunneling face and the tunneling cab to form a double-insurance closing effect with a dust prevention butler area for controlling the dust generated by the tunneling face to be within the tunneling space and preventing the dust from diffusing to the entire roadway; and the dust guide system is arranged on a lower portion of the roadway. such that the dust moves downward faster to guarantee rapid dust falling under linkage between the liquid nitrogen spray and the fine water spray, and the remaining dust may be removed. The centrifugal fan may pump air out of the tunneling space continuously and reduce the gas density in the tunneling space; and in addition, the fine water spray and the liquid nitrogen spray may wet and cool roadway surrounding rock or a coal body to prevent the gas and dust explosion accidents caused by sparks generated during coal and rock cutting. Therefore. by means of cooperation among dust falling by the magnetized fine water spray, dust-containing water spray condensation by the liquid nitrogen spray and dust falling by guiding, the present invention is good in dust removal effect, high in dust removal efficiency and wide in pragmaticality.
Brief Description of Drawings Fig. 1 is a structural schematic diagram of the present invention after assembly.
In the figures: 1. roadway: 2. bottom-plate air curtain generator: 3. first air inlet pipe: 4. dust blocking screen: 5. negative pressure resistance pipe: 6. centrifugal fan: 7. first liquid nitrogen pipe:
8. liquid nitrogen spray downward nozzle: 9. fine water spray downward nozzle: 10. first fine water spray pipe: 11. first three-way valve: 12. second liquid nitrogen pipe: 13. first liquid nitrogen control valve: 14. liquid nitrogen spray generator: 15. third liquid nitrogen pipe: 16. second liquid
BL-5176 nitrogen control valve: 17. liquid nitrogen container; 18. fourth liquid nitrogen pipe: 19. HyifPSS5 nitrogen spray straight nozzle: 20. fine water spray straight nozzle: 21. second fine waler spray pipe: 22. second three-way valve: 23. third fine water spray pipe: 24. first control valve: 25. fine water spray generator: 26. second control valve: 27. magnetized water injection pipe; 28. third three-way valve: 29. pressure ventilation pipe: 30. third control valve; 31. second air inlet pipe: 32. top-plate air curtain generator: 33. first air curtain; 34. second air curtain.
Detailed Description The present invention will be further elaborated hereafter.
As shown in Fig, 1. a liquid nitrogen spray and fine water spray linked dust falling method for a fully mechanized excavation face uses a fine water spray and liquid nitrogen spray linked system for dust falling and comprises specific steps: A. a bottom-plate air curtain generator 2 and a top-plate air curtain generator 32 in the fine water spray and liquid nitrogen spray linked system are arranged between a tunneling face and a tunneling cab. wherein the bottom-plate air curtain generator 2 is located on a bottom plate of a roadway and is 4.1-4.3 m away from the tunneling face: and the top-plate air curtain generator 32 is located on a top plate of a roadway and is 3.8-4.0 m away from the tunneling face: B. a fine water spray straight nozzle 20 in the fine water spray and liquid nitrogen spray linked system is arranged on a position 0.8-1.3 m away from the tunncling face and 0.3-0.6 m away from the top plate of the roadway. and a liquid nitrogen spray straight nozzle 19 in the fine water spray and liquid nitrogen spray linked system is arranged on a position 1.5-2.0 m away from the tunneling face and 0.7-0.9 m away from the top plate of the roadway. the fine water spray straight nozzle 20 and the liquid nitrogen spray straight nozzle 19 spraying fine water spray and liquid nitrogen spray being separately used for direct dust falling: C. a centrifugal fan 6 in the fine water spray and liquid nitrogen spray linked system is arranged on a position 5-5.5 m away from the tunneling face and 0.3-0.5 m away from the bottom plate of the roadway. the centrifugal fan 6 matching a dust blocking screen 4 by means of a negative pressure resistance pipe 5 for guiding dust to fall: a liquid nitrogen spray downward nozzle 8 in the fine water spray and fiquid nitrogen spray linked system is arranged on a position 2,8-3.1 m away from the tunneling face and 0.6-0.8 m away from the bottom plate of the roadway.
b
BL-5176 and a fine water spray downward nozzle 9 in the fine water spray and liquid nitrogen spray linked 02355 system is arranged on a position 2.5-2.7 m away {rom the tunneling face and 0.9-1.1 m away from the bottom plate of the roadway. the fine water spray downward nozzle 9 and the liquid nitrogen spray downward nozzle 8 spraying fine water spray and liquid nitrogen spray being separately used for settling of the dust guided downward: and the dust blocking screen 4 is arranged on a position 0.3-0.3 m away from the bottom plate of the roadway and 3.3-3.6 m away from the tunnehng face:
D. a pressure ventilation pipe 29 in the fine water spray and liquid nitrogen spray linked System is connected to a pressure ventilation system of the roadway: a magnetized water injection pipe 27 in the fine water spray and liquid nitrogen spray linked system is connected to a magnetized water conveying system of the roadway: and 10-20 min before a heading machine starts to work. a third control valve 30 is opened. and at the moment. the pressure ventilation system conveys high-pressure air flow into the pressure ventilation pipe 29. so as to start the top-plate air curtain generator 32 and the bottom-plate air curtain generator 2 to generate a first air curtain 33 and a second air curtain 34 respectively. a dust prevention buffer arca being formed between the first air curtain 33 and the second air curtain 34 to control the dust. generated by the tunneling face. in a tunneling space:
E. a second control valve 26 is opened. magnetized water is injected into a fine water spray generator 25 by means of the magnetized water injection pipe 27. a first control valve 24 is opened and the fine water spray generator 25 is started, at the moment, the fine water spray generator 25 converts the magnetized water into the fine water spray. and then the fine water spray is distributed to a first fine water spray pipe 10 and a second fine water spray pipe 21 by means of a third fine water spray pipe 23 and a second three-way valve 22 and is sprayed into the tunneling space by means of the fine water spray straight nozzle 20 and the fine water spray downward nozzle 9. the fine water spray generated by the fine water spray generator 25 having a flow of 11-13 m min and a diameter of less than 70 pm:
F. meanwhile. a liquid nitrogen spray generator 14 is started. the liquid nitrogen spray generator 14 converts liquid nitrogen into the liquid nitrogen spray. a first liquid nitrogen control valve 13 and a second liquid nitrogen control valve 16 are opened in sequence. and the generated
BL-5176 liquid nitrogen spray is distributed to a first liquid nitrogen pipe 7 and a fourth liquid nitrogth 02355 pipe 18 by means of a second liquid nitrogen pipe 12 and a first three-way valve 11 and is sprayed into the tunneling space by means of the liquid nitrogen spray straight nozzle 19 and the liquid nitrogen spray downward nozzle 8, the liquid nitrogen spray generated by the liquid nitrogen spray generator 14 has a flow of 20-30 L/min and a diameter of less than 250 um: and G. the centrifugal fan 6 is started. the centrifugal fan 6 may provide negative pressure not less than 600 KPa and then generates the negative pressure at a lower portion of the tunneling space by means of the negative pressure resistance pipe 5. thereby guiding the suspended dust in the tunneline space downward. at the moment. part of the dust generated by the tunneling face is combined with the fine water spray to form dust-containing water spray to fall in the tunneling space under the action of gravity and guiding pressure. meanwhile. the liquid nitrogen spray makes contact with the dust-containing water spray in the falling process to make the dust-containing water spray rapidly fall and condense. after condensation. the dust-containing water spray falls faster until it reaches the bottom plate of the tunneling space. and a primary settling process is completed: the remaining dust not combined with the fine water spray moves to a lower portion of the tunneling face under the guiding action of the negative pressure, when passing through the fine water spray downward nozzle 9 and the liquid nitrogen spray downward nozzle 8. this part of the dust is combined with the fine water spray sprayed by the fine water spray downward nozzle 9 to form dust-containing water spray. the liquid nitrogen spray sprayed by the liquid nitrogen spray downward nozzle 8 makes contact with the dust-containing water spray to make the dust-containing water spray rapidly fall and condense. after condensation. the dust-containing water spray falls faster until it reaches the bottom plate of the tunneling space. and a secondary settling process is completed: finally, under the condition that there still exists remaining non-falling dust. the remaining non-falling dust 1s adsorbed on the dust blocking screen 4 under the action of the negative pressure. thereby achieving dust falling work in the tunneling space. and meanwhile. the centrifugal fan 6 may pump air out of the tunneling space continuously and reduce a gas density in the tunneling space: and in addition. the falling fine water spray in the tunneling space may wet and cool surrounding rock around the roadway or a coal body 10 effectively reduce a possibility of generating sparks during coal and rock cutting in a tunneling Process.
8
BI1-5176 The above fine water spray and liquid nitrogen spray linked system comprises an air curtail 02355 generation system, a line water spray dusting falling system, a liquid nitrogen atomization system and a dust guide system. and each system is arranged in the roadway 1; the air curtain generation system comprises the bottom-plate air curtain generator 2. the first air inlet pipe 3. the top-plate air curtain generator 32. the second air inlet pipe 31. the pressure ventilation pipe 29 and a third three-way valve. wherein one end of the pressure ventilation pipe is connected to one of ports of the third three-way valve: the other two ports of the third three-way valve are connected to one end of the first air inlet pipe 3 and one end of the second air inlet pipe
31. the other end of the first air inlet pipe 3 is connected to the bottom-plate air curtain generator
2. and the other end of the second air let pipe 31 is connected to the top-plate air curtain generator 32: the top-plate air curtain generator 32 is fixed 10 the top plate of the roadway 1 and blows air to the bottom plate to generate the first air curtain 33. and the bottom-plate air curtain generator 2 is fixed to the bottom plate of the roadway 1 and blows air to the top plate to generate the second air curtain 34: the first air curtain 33 is parallel to the second air curtain 34: the dust prevention buffer area 1s formed between the first air curtain 33 and the second air curtain 34. and the first air curtain 33 and the second air curtain 34 divide the roadway 1 into the tunneling space and a worker operation space: the tunneling face is located in the tunneling space: the fine water spray dust falling system comprises a first fine water spray pipe 10. the second {ine water spray pipe 21. the second three-way valve 22, a third fine water spray pipe 23. the fine water spray generator 25 and the magnetized water injection pipe 27, wherein the second three-way valve 23. the third fine water spray pipe 23, the fine water spray generator 25 and the magnetized water Injection pipe 27 are all located in the worker operation space: one end of the magnetized water injection pipe 27 1s connected to an inlet of the fine water spray generator 25. an outlet of the fine water spray generator 25 is connected to one of ports of the second three-way valve 22 by means of the third fine water spray pipe 23. the other two ports of the second three-way valve 22 are connected 10 one end of the first fine water spray pipe 10 and one end of the second fine water spray pipe 21 separately. the other end of the first fine water spray 10 is provided with the fine water spray downward nozzle 9 which penetrates the first air curtain 33 and the second air curtain 34 10 extend into the tunneling space. and the other end of the second fine water spray pipe 21 is provided with the fine water spray stringht nozzle 20 which penetrates 4
{31-5176 the first air curtain 33 and the second air curtain 34 to extend into the tunneling space; the frise 02355 water spray straight nozzle 20 is higher than the fine water spray downward nozzle 9, and the fine water spray is spraved into the tunneling space by means of the fine water spray straight nozzle 20 and the fine water spray downward nozzle 9:
the liquid nitrogen atomization system comprises the first liquid nitrogen pipe 7. the second liquid nitrogen pipe 12. a third liquid nitrogen pipe 15. a fourth liquid nitrogen pipe 18, the first three-way valve IT. the liquid nitrogen spray generator 14 and a liquid nitrogen container 17. wherein the second fiquid nitrogen pipe 12, the third liquid nitrogen pipe 15. the first three-way valve 11. the liquid nitrogen spray generator 14 and the liquid nitrogen container 17 are all located in the worker operation space: an outlet of the liquid nitrogen container 17 is connected to an inlet of the liquid nitrogen spray generator [4 by means of the third liquid nitrogen pipe 15. an outlet of the liquid nitrogen spray generator 14 1s connected to one of ports of the first three-way valve 11 by means of the second liquid nitrogen pipe 15. the other two ports of the first three-way valve 11 are connécted to one end of the first liquid nitrogen pipe 15 and one end of the fourth liguid nitrogen pipe 18. the other end of the first liquid nitrogen pipe 7 is provided with the liquid nitrogen spray downward nozzle 8 which penetrates the first air curtain 33 and the second air curtain 34 to extend into the tunneling space. and the other end of the fourth liquid nitrogen pipe 18 is provided with the Hquid nitrogen spray straight nozzle 19 which penetrates the first air curtain 33 and the second air curtain 34 to extend into the tunneling space; the liquid nitrogen spray straight nozzle 19 is located between the fine water spray straight nozzle 20 and the fine water spray downward nozzle 9, the liquid nitrogen spray downward nozzic 8 is located below the fine water spray downward nozzle 9. and the liquid nitrogen spray 1s sprayed into the tunneling space by means of the liquid nitrogen spray straight nozzle 19 and the liquid nitrogen spray downward nozzle 8:
the dust guide system comprises the negative pressure resistance pipe 5 and the centrifugal fan 6. whercin the centrifugal fan 6 is located in the worker operation space. one end of the negative pressure resistance pipe 5 is connected to an air suction port of the centrifugal fan 6. the other end of the negative pressure resistance pipe 6 15 provided with the dust blocking screen 4 which penetrates the first air curtain 33 and the second air curtain 34 to extend into the tunneling space. and the dust blocking screen À is located below the liquid nitrogen spray downward nozzle
[4
[31-5176 8: and LU102355 the second liquid nitrogen pipe 12 is provided with the first liquid nitrogen control valve 13, the third liquid nitrogen pipe 15 1s provided with a second liquid nitrogen control valve 16. the third fine water spray pipe 23 is provided with the first control valve 24, the magnetized water injection pipe 27 is provided with the second control valve 26. and the pressure ventilation pipe 29 is provided with the third control valve 30. The above fine water spray generator 25. liquid nitrogen spray generator 14. bottom-plate air curtain generator 2 and top-plate air curtain generator 32 are existing devices.
In
Claims (1)
131-5176 CLAIMS LU102355 i.
A liquid nitrogen spray and fine water spray linked dust falling method for a fully mechanized excavation face. using a fine water spray and liquid nitrogen spray linked system for dust falling, and comprising specific steps:
A. arranging a bottom-plate air curtain generator and a top-plate air curtain generator in the fine water spray and liquid nitrogen spray linked system between a tunneling face and a tunneling cab, wherein the bottom-plate air curtain generator is located on a bottom plate of a roadway and is 4.1-4.3 m away from the tunneling face: and the top-plate air curtain generator is located on a top plate of a roadway and 1s 3.8-4.0 m away from the tunneling face:
B. arranging a fine water spray straight nozzle in the fine water spray and liquid nitrogen spray linked system on a position 0.8-1.3 m away from the tunneling face and 0.3-0.6 m away from the top plate of the roadway. and arranging a liquid nitrogen spray straight nozzle in the fine walter spray and liquid nitrogen spray linked system on a position 1.5-2.0 m away from the tunneling face and 0.7-0.9 m away from the top plate of the roadway. the fine water spray straight nozzle and the liquid nitrogen spray straight nozzle spraying fine water spray and liquid nitrogen spray being separately used for direct dust falling:
C. arranging a centrifugal fan in the fine water spray and liquid nitrogen spray linked system on a position 5-5.5 m away from the tunneling face and 0.3-0.5 m away from the bottom plate of the roadway. the centrifugal fan matching a dust blocking screen by means of a negative pressure resistance pipe for guiding dust to fall: a liquid nitrogen spray downward nozzle in the fine water spray and liquid nitrogen spray linked system on a position 2.8-3.1 m away from the tunneling face and 0.6-0.8 m away from the bottom plate of the roadway: and arranging a fine water spray downward nozzle in the fine water spray and liquid nitrogen spray linked system on a position 2.5-2.7 m away from the tunneling face and 0.9-1.1 m away from the bottom plate of the roadway. the fine water spray downward nozzle and the liquid nitrogen spray downward nozzle spraving fine water spray and liquid nitrogen spray being separately used for settling of the dust vuided downward. and the dust blocking screen being arranged on a position 0.3-0,5 m away from the bottom plate of the roadway and 3.3-3.6 m away from the tunneling face:
D. connecting a pressure ventilation pipe in the fine water spray and liquid nitrogen
12
BL-3176 oo LU102355 spray linked system to a pressure ventilation system of the roadway: connecting a magnetized water injection pipe in the line water spray and liquid nitrogen spray linked system to a magnetized water conveying system of the roadway: and opening a third control valve 10-20 min before a heading machine starts to work. and at the moment. conveying high-pressure air flow into the pressure ventilation pipe by the pressure ventilation system. so as to start the top-plate air curtain generator and the bottom-plate air curtain generator 10 generate a first air curtain and a second air curtain respectively. a dust prevention buffer arca being formed between the first air curtain and the second air curtain to control the dust. gencrated by the tunneling face. in a tunneling space:
E. opening a second control valve, injecting magnetized water into a fine water spray cencrator by means of the magnetized water injection pipe. opening a first control valve and starting the fine water spray generator. wherein at the moment. the fine water spray generator converts the magnetized water into the fine water spray. and then the fine water spray is distributed to a first fine water spray pipe and a second fine water spray pipe by means of a third fine water spray pipe and a second three-way valve and is sprayed into the tunneling space by means of the fine water spray straight nozzle and the fine water spray downward nozzle. the fine water spray generated by the fine water spray generator having a flow of 11-13 m/min and a diameter of less than 70 um:
F. meanwhile. starting a liquid nitrogen spray generator. wherein the liquid nitrogen spray generator converts liquid nitrogen into the liquid nitrogen spray, a first liquid nitrogen control valve and a sccond liquid nitrogen control valve are opened in sequence. and the generated liquid nitrogen spray is distributed to a first liquid nitrogen pipe and a fourth liquid nitrogen pipe by means of a sccond liquid nitrogen pipe and a first three-way valve and is spraved into the tunneling space by means of the liquid nitrogen spray straight nozzle and the liquid nitrogen spray downward nozzle. the liquid nitrogen spray generated by the liquid nitrogen spray generator has a flow of 20-30 L/min and a diameter of less than 250 pm: and
Gi. starting the centrifugal fan. wherein the centrifugal fan may provide negative pressure not less than 600 KPa and then generates the negative pressure at a lower portion of the tunneling space by means of the negative pressure resistance pipe. thereby guiding suspended dust in the
13
BI-S176 LU102355 tunneling space downward. at the moment, part of the dust generated by the tunneling face is combined with the line water spray to form dust-containing water spray to fall in the tunneling space under the action of gravity and guiding pressure. meanwhile. the liquid nitrogen spray makes contact with the dust-containing water spray in the falling process to make the dust-containing water spray rapidly fall and condense. after condensation. the dust-containine water spray falls faster until it reaches the bottom plate of the tunneling space. and a primary settling process 1s completed: the remaining dust not combined with the fine water spray moves to a lower portion of the tunneling face under the guiding action of the negative pressure. when passing through the fine water spray downward nozzle and the liquid nitrogen spray downward nozzle. this part of the dust is combined with the fine water spray sprayed by the fine water spray downward nozzle to form dust-containing water spray. the liquid nitrogen spray sprayed by the liquid nitrogen spray downward nozzle makes contact with the dust-containing water spray to make the dust-containing water spray rapidly fall and condense. after condensation. the dust-containing water spray falls faster until it reaches the bottom plate of the tunneling space. and a secondary settling process is completed: finally. under the condition that there still exists remaining non-falling dust, the remaining non-falling dust is adsorbed on the dust blocking screen under the action of the negative pressure. thereby achieving dust settling work in the tunneling space, and meanwhile. the centrifugal fan may pump air out of the tunneling space continuously and reduce a gas density in the tunneling space: and in addition. the fine water spray in the tunneling space may wel and cool surrounding rock around the roadway or a coal body after settled. so as to effectively reduce a possibility of gencrating sparks during coal and rock cutting in a tunneling process. 14
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| CN202010407064.9A CN111396117B (en) | 2020-05-14 | 2020-05-14 | Method for achieving dust settling through linkage of liquid nitrogen mist and fine water mist on fully mechanized excavation face |
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| CN117266912A (en) * | 2023-08-10 | 2023-12-22 | 陕西北纳技术有限公司 | Quantum magnetizing, spraying and dedusting system for coal mining |
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| CN114215599B (en) * | 2022-02-22 | 2022-05-31 | 中国矿业大学(北京) | Outburst prevention, dust fall and extraction integrated device for underground tunneling working face |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102359376B (en) * | 2011-09-22 | 2014-04-16 | 中国矿业大学 | Air curtain and water mist linkage dust settling method for full mechanized workface |
| CN102536236B (en) * | 2011-12-30 | 2014-07-16 | 中国矿业大学 | Settling, isolating and removing integrated dust prevention method of fully mechanized excavation face |
| CN102937033B (en) * | 2012-12-03 | 2014-10-15 | 中国矿业大学 | Efficient nitrogen injection and fire extinguishing system for mining |
| CN103362534B (en) * | 2013-07-10 | 2016-01-06 | 中国矿业大学 | Nitrogen inhibition water mist preparation system for preventing and treating mine fire and fire prevention and extinguishing method thereof |
| CN104329109A (en) * | 2014-08-29 | 2015-02-04 | 辽宁工程技术大学 | Gob retardant efficient spraying system and spraying method |
| CN206256923U (en) * | 2016-11-17 | 2017-06-16 | 西南交通大学 | Suitable for the Tunnel Construction Ventilation System of various environment |
| CN206174988U (en) * | 2016-11-18 | 2017-05-17 | 济宁学院 | A thick liquid liquid spray ization fire extinguishing systems for mine |
| CN107620607B (en) * | 2017-09-12 | 2019-04-30 | 中国矿业大学 | A kind of fully mechanized workface step subzone of atomization dust removal method |
| CN208858393U (en) * | 2018-08-29 | 2019-05-14 | 李丽 | A kind of coal mine gob nitrogen injection spray device |
| CN209645690U (en) * | 2019-03-19 | 2019-11-19 | 西安科技大学 | A kind of mining goaf retardant quick break fire extinguishing device |
| CN209704622U (en) * | 2019-04-08 | 2019-11-29 | 四川省交通勘察设计研究院有限公司 | A kind of dust falling device used for constructing tunnel |
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| CN117266912A (en) * | 2023-08-10 | 2023-12-22 | 陕西北纳技术有限公司 | Quantum magnetizing, spraying and dedusting system for coal mining |
| CN117266912B (en) * | 2023-08-10 | 2024-05-14 | 陕西北纳技术有限公司 | Quantum magnetizing, spraying and dedusting system for coal mining |
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| CN111396117A (en) | 2020-07-10 |
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