CN105937405B - A kind of fire extinguishing method of U-shaped ventilation operation face goaf tunneling boring curtain note nitrogen - Google Patents
A kind of fire extinguishing method of U-shaped ventilation operation face goaf tunneling boring curtain note nitrogen Download PDFInfo
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 844
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 441
- 230000005641 tunneling Effects 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 70
- 238000009423 ventilation Methods 0.000 title claims abstract description 22
- 238000002347 injection Methods 0.000 claims abstract description 74
- 239000007924 injection Substances 0.000 claims abstract description 74
- 239000003245 coal Substances 0.000 claims abstract description 49
- 230000010339 dilation Effects 0.000 claims abstract description 16
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen(.) Chemical compound [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000011148 porous material Substances 0.000 claims description 12
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 11
- 238000005516 engineering process Methods 0.000 claims description 11
- 230000033228 biological regulation Effects 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 5
- 239000003818 cinder Substances 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 238000004804 winding Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 5
- 230000003647 oxidation Effects 0.000 abstract description 3
- 238000007254 oxidation reaction Methods 0.000 abstract description 3
- 238000009792 diffusion process Methods 0.000 abstract description 2
- 238000010926 purge Methods 0.000 abstract description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 11
- 239000001301 oxygen Substances 0.000 description 11
- 229910052760 oxygen Inorganic materials 0.000 description 11
- 230000002269 spontaneous effect Effects 0.000 description 11
- 238000002485 combustion reaction Methods 0.000 description 8
- 230000002265 prevention Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 241001074085 Scophthalmus aquosus Species 0.000 description 2
- 238000002627 tracheal intubation Methods 0.000 description 2
- 206010000369 Accident Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
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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
- E21F5/08—Rock dusting of mines; Depositing other protective substances
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- Mining & Mineral Resources (AREA)
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Abstract
The present invention relates to a kind of fire extinguishing methods of U-shaped ventilation operation face goaf tunneling boring curtain note nitrogen, comprising: determines main line nitrogen flow QN, feature is: note nitrogen pipe lays quantity n0=int (Ly/Lb+ 1), n0When=3, nitrogen pipe tunneling boring 1. is infused after the rear portion scraper-trough conveyer inboard laying at bracket rear portion by first, as coal working face is advanced to along advance of the face direction away from goaf line of demarcation LKAfter distance, after upper and lower end leak stopping, the note nitrogen pipe control valve is opened to goaf tunneling boring continuous nitrogen injection, 2. as coal working face is advanced to distance L between two note nitrogen pipesbNitrogen injection in goaf tubes rows away from when, the method 1. of repetition lays next note nitrogen pipe, realizes that next note nitrogen pipe infuses nitrogen, 3. repeats method realization third root note nitrogen pipe goaf tunneling boring continuous nitrogen injection 2..Note nitrogen forms continuous nitrogen curtain in entire goaf, inhibits to lose low-temperature oxidation of coal and prevents nitrogen from pouring into the face of adopting, makes full use of nitrogen dilation angle, improve nitrogen diffusion effect, nitrogen purging efficiency.
Description
Technical field
The present invention relates to coal mine gob nitrogen injection methods, further relate to goaf tunneling boring nitrogen injection method,
In particular to a kind of fire extinguishing method of U-shaped ventilation operation face goaf tunneling boring curtain note nitrogen.
Background technique
Conflagration Caused by Coal Self-ignition is one of China's mine major casualty, and coal-mine fire accident can not only generate a large amount of poisonous and harmful
Gas seriously threatens the life security of underground operators, and more because of secondary disasters such as coal dust, the gas explosions of fire initiation
It is serious.In recent years, spontaneous combustionof coal prevents and treats theoretical and technology and has obtained preferable development in China, especially some new technologies,
New process, new diseases have effectively prevented the spontaneous combustionof coal of mine, have ensured the safe working of mine.Goaf
Nitrogen fire extinguishing mainly blocks underground fire source, liquid nitrogen is sent to fire source point or oxidized zone, and in specific position
Channel of leaking out is reserved, makes liquid nitrogen full of the space near flame range, excludes the air in flame range, reduce the concentration of oxygen.Due to note
The effect of nitrogen pressure makes in high barotropic state in goaf, and reduction is leaked out mobile to flame range；Heat is absorbed when liquid nitrogen gasification, is dropped
Low flame range temperature；Nitrogen injects in enclosed area, keeps flame range gas inerted, has inhibition detonation concurrently.
Existing note nitrogen mode mainly has nitrogen injection with buried pipe, hauling pipe note nitrogen, drilling note nitrogen, intubation note nitrogen etc..Nitrogen injection with buried pipe is
Along working face air inlet crossheading to the pre-buried seamless steel pipe in goaf deep direction, the tube used for bottom pouring after the advance of the face to suitable position
Road valve, nitrogen enters goaf by the liberation port of line end, and is diffused into other regions with flowing distinguished and admirable in goaf；
Drilling note nitrogen is to apply brill from ground toward underground ignition spontaneous combustion region or the fatalness region for having spontaneous combustion risk, then cover with drilling
Pipe infuses nitrogen or the tunnel adjoining in working face, applies brill together to the relatively high place of possible degree of being under fire using note nitrogen technique is drilled
When injecting nitrogen；It is to bury a note nitrogen pipeline along goaf in inlet side that hauling pipe, which infuses nitrogen, and with the advance of the face, the pipe laying is hydraulic
It is moved forward under the traction of bracket or face conveyor head, tail or winch, remains the note nitrogen of certain distance；Intubation note
Nitrogen is can to take when the open-off cut of working face or stop adopts the high roof fall of line and tunnel fire occurs and directly be intubated note nitrogen to fire source
It puts out a fire.And respectively infuse nitrogen mode and have the following problems: nitrogen dilation angle is small, and effective range is limited；It is leaked by goaf
Wind effect is big, is unevenly distributed in goaf；Liberation port quantity is few, inerting low efficiency.
Summary of the invention
In order to overcome the above-mentioned deficiencies of the prior art, a kind of U-shaped ventilation operation face goaf tunneling boring curtain note nitrogen is provided
Fire extinguishing method.
The technical solution adopted by the present invention is that: a kind of fire extinguishing of U-shaped ventilation operation face goaf tunneling boring curtain note nitrogen
Method, comprising: main line is determined according to " coal mine nitrogen preventing and extinguishing fire technology specification " (MT/T701-1997) the 7.1st article regulation
Nitrogen flow QN, feature is: note nitrogen pipe lays quantity n0=int (Ly/Lb+ 1), n in formula0- nitrogen injection in goaf pipe lays number
Amount, road；Ly- prediction goaf oxidized zone maximum width, m, Lb- nitrogen injection in goaf tubes rows are away from m；Work as n0When=3, flow divider
For four-way valve, nitrogen pipe tunneling boring 1. is infused after the rear portion scraper-trough conveyer inboard laying at bracket rear portion by first, infuses the note nitrogen pipe of nitrogen pipe
Open end sequential connection is set to pressure hose, flow divider, note nitrogen main line, nitrogen-making device in haulage gate, infuses nitrogen flow divider
Flowmeter, pressure gauge and control valve are installed in each outlet, as coal working face is advanced to along advance of the face direction away from mined out
Distinguish boundary line LKAfter distance, after carrying out leak stopping to the upper end of working face, lower end, open the control valve of the note nitrogen pipe to
2. goaf tunneling boring continuous nitrogen injection is advanced to the spacing of two note nitrogen pipes with coal working face along advance of the face direction
From LbNitrogen injection in goaf tubes rows away from when, the method 1. of repetition lays next note nitrogen pipe, next note nitrogen pipe goaf of realization
Tunneling boring continuous nitrogen injection, the method 3. repeated 2. realize that third root infuses nitrogen pipe goaf tunneling boring continuous nitrogen injection.Work as n0It is other
When value, flow divider n0+ 1 port valve, method are analogized.
Wherein: working as n0When=3, when carrying out the 4th note nitrogen pipe laying by the above process, first note nitrogen pipe is cut off
The 4th note nitrogen pipe is accessed after pressure hose, when carrying out the 5th note nitrogen pipe laying by the above process, cuts off second note nitrogen
The 5th note nitrogen pipe is accessed after the pressure hose of pipe, and so on all goaf tunneling boring nitrogen injections of realization.Work as n0For
When other values, flow divider n0+ 1 port valve, method are analogized.
Wherein: LK﹥ r,
In formula,
Lb- nitrogen injection in goaf tubes rows are away from m；
R-nitrogen dilation angle, m；
Pb- flow divider branch outlet pressure, Pa；
Pd- working face air entering and returning pressure difference, Pa；
K-goaf porosity；
QN- main line nitrogen flow, m3/min；
QL- working face inleakage, m3/min；
Vb- flow divider branch exit velocity, m/min.
Wherein: note nitrogen pipe is note nitrogen pipe sealed end by one end, and the other end is the steel pipe composition for infusing nitrogen pipe open end, along note nitrogen
Manage the venthole that L at a certain distance makes a call to the nitrogen relief hole group that one group is made of cell orifice, L=int (Lz/n1), L in formulaz-
Working face is inclined to length, m；n1- nitrogen relief hole group quantity, group；n1=int (Lz/ 2r+1), r-nitrogen dilation angle in formula,
m；Infuse the unit pore radius R of i-th group of goaf nitrogen relief hole group when nitrogen gas outlet unit hole count is sixiIt is obtained by following formula:
In formula:
RiThe cell orifice half for the i-th group of nitrogen relief hole group in goaf that-every group nitrogen relief hole group unit hole count is six
Diameter, mm, i value 1-n1Between integer, since pressure hose end；
P0Atmospheric pressure under-mark condition, Pa；
I-th group of i-goaf nitrogen relief hole group quantity, value 1-n1Between integer；
D-note nitrogen pipe radius, m.
Wherein: when note nitrogen pipe tunneling boring is laid along the rear portion scraper-trough conveyer inboard at bracket rear portion, being protected with coal cinder or grillage
And it is anti-blocking using filter screen winding note nitrogen nitrogen relief hole group, when the cell orifice of nitrogen relief hole group can be two to seven,
In formula: RniThe half of i-th group of goaf nitrogen releasing unit hole when the unit hole count of-every group nitrogen relief hole group is n
Diameter, mm, i value 1-n1Between integer, since pressure hose end；
Ri- every group nitrogen relief hole group unit hole count is the cell orifice half of a i-th group of nitrogen relief hole group in goaf
Diameter, mm, i value 1-n1Between integer, since pressure hose end；
The cell orifice number of every group of nitrogen relief hole group of n-, value 2,3,4,5,7.It takes and is also being protected when other numerical value
Among.
The beneficial effects of the present invention are: nitrogen delivery pipe curb rear portion scraper-trough conveyer tunneling boring is laid, it can be entire mined out
Continuous nitrogen curtain is formed in area, at the same time, the low-temperature oxidation of Residual coal in goaf can effectively be inhibited and prevent by blocking end up and down
Nitrogen pours into the face of adopting, and makes full use of nitrogen dilation angle, guarantees nitrogen diffusion effect, nitrogen is arranged on nitrogen injection in goaf pipe 2
Relief hole group 11, substantially increases nitrogen purging efficiency, and the present invention is especially hidden to a wide range of spontaneous combustion in goaf, goaf
Cover fire source and high-order fire source, fully mechanized coal face spontaneous combustionof coal control efficiency more preferably.
Detailed description of the invention
Fig. 1 present invention infuses nitrogen pipeline arrangement schematic diagram；
Note nitrogen pipe gas outlet arrangement schematic diagram Fig. 2 of the invention；
Fig. 3 nitrogen relief hole group arrangement schematic diagram of the present invention.
1. goaf in figure, 2. note nitrogen pipes, 3. pressure hoses, 4. working faces, 5. flow dividers, 6. working faces enter the wind direction,
7. main line, 8. goaf lines of demarcation, 9. working face return air directions, 10. cell orifices, 11. nitrogen relief hole groups.
Specific embodiment
First embodiment
Referring to Fig. 1, Fig. 2, a kind of fire extinguishing method of U-shaped ventilation operation face goaf tunneling boring curtain note nitrogen, comprising: root
Note nitrogen quantity is determined according to " coal mine nitrogen preventing and extinguishing fire technology specification " (MT/T701-1997) the 7.1st article regulation, specifically:
Wherein, Q0Inleakage in the oxidized zone of-goaf, m3/min；The general 1/60-1/100 by face air volume chooses；
After taking wind leaking stoppage measure, inleakage is estimated in the oxidized zone of goaf；
C1Average oxygen concentration in the oxidized zone of-goaf, %；
C2- goaf inerting fire prevention index, value are the critical oxygen concentration of coal spontaneous combustion, %；
CNThe nitrogen gas concn of-injection nitrogen, %；
K-reserve factor, takes 1.4.
Above formula input parameter can calculate note nitrogen quantity: QN=900m3/ h=15m3/min
Feature is: note nitrogen pipe 2 lays quantity n0=int (Ly/Lb+ 1)=int (70/30+1)=3, n in formula0- mined out
It infuses nitrogen pipe 2 and lays quantity, road in area；Ly- prediction goaf oxidized zone maximum width, 70m, Lb- nitrogen injection in goaf tubes rows away from,
30m；Work as n0When=3, flow divider 5 is four-way valve, and it is inboard 1. to infuse rear portion scraper-trough conveyer of 2 tunneling boring of nitrogen pipe along bracket rear portion for first
After laying, the note nitrogen pipe open end sequential connection of note nitrogen pipe 2 is set to pressure hose 3, flow divider 5, note nitrogen master in haulage gate
Pipeline 7, nitrogen-making device, note nitrogen flow divider 5 respectively outlet installs flowmeter, pressure gauge and control valve, with coal working face along
4 direction of propulsion of working face is advanced to away from goaf line of demarcation 8LKAfter distance, upper end, the lower end of working face 4 are blocked up
After leakage, the control valve of the note nitrogen pipe 2 is opened to goaf tunneling boring continuous nitrogen injection, 2. as coal working face 4 is along working face 4
Direction of propulsion is advanced to distance L between two note nitrogen pipes 2bNitrogen injection in goaf tubes rows away from when, repeat 1. method laying it is next
Root infuses nitrogen pipe 2, realizes next 2 goaf tunneling boring continuous nitrogen injection of note nitrogen pipe, and the method 3. repeated 2. realizes that third root infuses nitrogen
2 goaf tunneling boring continuous nitrogen injection of pipe.Work as n0When for other values, flow divider 5 is n0+ 1 port valve, method are analogized.
Second embodiment
Referring to Fig. 1, Fig. 2, a kind of fire extinguishing method of U-shaped ventilation operation face goaf tunneling boring curtain note nitrogen, comprising: root
Note nitrogen quantity is determined according to " coal mine nitrogen preventing and extinguishing fire technology specification " (MT/T701-1997) the 7.1st article regulation, specifically:
Wherein, Q0Inleakage in the oxidized zone of-goaf, m3/min；The general 1/60-1/100 by face air volume chooses；
After taking wind leaking stoppage measure, inleakage is estimated in the oxidized zone of goaf；
C1Average oxygen concentration in the oxidized zone of-goaf, %；
C2- goaf inerting fire prevention index, value are the critical oxygen concentration of coal spontaneous combustion, %；
CNThe nitrogen gas concn of-injection nitrogen, %；
K-reserve factor, takes 1.4.
Above formula input parameter can calculate note nitrogen quantity: QN=900m3/ h=15m3/min
Feature is: note nitrogen pipe 2 lays quantity n0=int (Ly/Lb+ 1)=int (70/30+1)=3, n in formula0- mined out
It infuses nitrogen pipe 2 and lays quantity, road in area；Ly- prediction goaf oxidized zone maximum width, 70m, Lb- nitrogen injection in goaf tubes rows away from,
30m；Work as n0When=3, flow divider 5 is four-way valve, and it is inboard 1. to infuse rear portion scraper-trough conveyer of 2 tunneling boring of nitrogen pipe along bracket rear portion for first
After laying, the note nitrogen pipe open end sequential connection of note nitrogen pipe 2 is set to pressure hose 3, flow divider 5, note nitrogen master in haulage gate
Pipeline 7, nitrogen-making device, note nitrogen flow divider 5 respectively outlet installs flowmeter, pressure gauge and control valve, with coal working face along
4 direction of propulsion of working face is advanced to away from goaf line of demarcation 8LKAfter distance, upper end, the lower end of working face 4 are blocked up
After leakage, the control valve of the note nitrogen pipe 2 is opened to goaf tunneling boring continuous nitrogen injection, 2. as coal working face 4 is along working face 4
Direction of propulsion is advanced to distance L between two note nitrogen pipes 2bNitrogen injection in goaf tubes rows away from when, repeat 1. method laying it is next
Root infuses nitrogen pipe 2, realizes next 2 goaf tunneling boring continuous nitrogen injection of note nitrogen pipe, and the method 3. repeated 2. realizes that third root infuses nitrogen
2 goaf tunneling boring continuous nitrogen injection of pipe.Work as n0When for other values, flow divider 5 is n0+ 1 port valve, method are analogized.
Wherein: working as n0When=3, when carrying out the 4th note nitrogen pipe 2 laying by the above process, first note nitrogen pipe 2 is cut off
Pressure hose 3 after access the 4th note nitrogen pipe 2, when carrying out the 5th note nitrogen pipe 2 by the above process and laying, cutting second
Access the 5th note nitrogen pipe 2 after infusing the pressure hose 3 of nitrogen pipe 2, and so on all goaf tunneling boring nitrogen injections of realization.
Work as n0When for other values, flow divider 5 is n0+ 1 port valve, method are analogized.
3rd embodiment
Referring to Fig. 1, Fig. 2, a kind of fire extinguishing method of U-shaped ventilation operation face goaf tunneling boring curtain note nitrogen, comprising: root
Note nitrogen quantity is determined according to " coal mine nitrogen preventing and extinguishing fire technology specification " (MT/T701-1997) the 7.1st article regulation, specifically:
Wherein, Q0Inleakage in the oxidized zone of-goaf, m3/min；The general 1/60-1/100 by face air volume chooses；
After taking wind leaking stoppage measure, inleakage is estimated in the oxidized zone of goaf；
C1Average oxygen concentration in the oxidized zone of-goaf, %；
C2- goaf inerting fire prevention index, value are the critical oxygen concentration of coal spontaneous combustion, %；
CNThe nitrogen gas concn of-injection nitrogen, %；
K-reserve factor, takes 1.4.
Above formula input parameter can calculate note nitrogen quantity: QN=900m3/ h=15m3/min
Feature is: note nitrogen pipe 2 lays quantity n0=int (Ly/Lb+ 1)=int (70/30+1)=3, n in formula0- mined out
It infuses nitrogen pipe 2 and lays quantity, road in area；Ly- prediction goaf oxidized zone maximum width, 70m, Lb- nitrogen injection in goaf tubes rows away from,
30m；Work as n0When=3, flow divider 5 is four-way valve, and it is inboard 1. to infuse rear portion scraper-trough conveyer of 2 tunneling boring of nitrogen pipe along bracket rear portion for first
After laying, the note nitrogen pipe open end sequential connection of note nitrogen pipe 2 is set to pressure hose 3, flow divider 5, note nitrogen master in haulage gate
Pipeline 7, nitrogen-making device, note nitrogen flow divider 5 respectively outlet installs flowmeter, pressure gauge and control valve, with coal working face along
4 direction of propulsion of working face is advanced to away from goaf line of demarcation 8LKAfter distance, upper end, the lower end of working face 4 are blocked up
After leakage, the control valve of the note nitrogen pipe 2 is opened to goaf tunneling boring continuous nitrogen injection, 2. as coal working face 4 is along working face 4
Direction of propulsion is advanced to distance L between two note nitrogen pipes 2bNitrogen injection in goaf tubes rows away from when, repeat 1. method laying it is next
Root infuses nitrogen pipe 2, realizes next 2 goaf tunneling boring continuous nitrogen injection of note nitrogen pipe, and the method 3. repeated 2. realizes that third root infuses nitrogen
2 goaf tunneling boring continuous nitrogen injection of pipe.Work as n0When for other values, flow divider 5 is n0+ 1 port valve, method are analogized.
Wherein: working as n0When=3, when carrying out the 4th note nitrogen pipe 2 laying by the above process, first note nitrogen pipe 2 is cut off
Pressure hose 3 after access the 4th note nitrogen pipe 2, when carrying out the 5th note nitrogen pipe 2 by the above process and laying, cutting second
Access the 5th note nitrogen pipe 2 after infusing the pressure hose 3 of nitrogen pipe 2, and so on all goaf tunneling boring nitrogen injections of realization.
Work as n0When for other values, flow divider 5 is n0+ 1 port valve, method are analogized.
Wherein: LK﹥ r,
Lb=30m
In formula,
Lb- nitrogen injection in goaf tubes rows are away from m；
R-nitrogen dilation angle, m take 15m；
Pb5 branch outlet pressure of-flow divider, Pa take 250000Pa；
Pd4 air entering and returning pressure difference of-working face, Pa enter the wind wind pressure between direction 6 and working face return air direction 9 in working face
Difference takes 600Pa；
K-goaf porosity, takes 0.3；
QN7 nitrogen flow of-main line, m3/ min, takes 15m3/min；
QL- working face inleakage, m3/ min, takes, 5m3/min；
Vb5 branch exit velocity of-flow divider, m/min, 2544m/min.
Fourth embodiment
Referring to Fig. 1, Fig. 2, a kind of fire extinguishing method of U-shaped ventilation operation face goaf tunneling boring curtain note nitrogen, comprising: root
Note nitrogen quantity is determined according to " coal mine nitrogen preventing and extinguishing fire technology specification " (MT/T701-1997) the 7.1st article regulation, specifically:
Wherein, Q0Inleakage in the oxidized zone of-goaf, m3/min；The general 1/60-1/100 by face air volume chooses；
After taking wind leaking stoppage measure, inleakage is estimated in the oxidized zone of goaf；
C1Average oxygen concentration in the oxidized zone of-goaf, %；
C2- goaf inerting fire prevention index, value are the critical oxygen concentration of coal spontaneous combustion, %；
CNThe nitrogen gas concn of-injection nitrogen, %；
K-reserve factor, takes 1.4.
Above formula input parameter can calculate note nitrogen quantity: QN=900m3/ h=15m3/min
Feature is: note nitrogen pipe 2 lays quantity n0=int (Ly/Lb+ 1)=int (70/30+1)=3, n in formula0- mined out
It infuses nitrogen pipe 2 and lays quantity, road in area；Ly- prediction goaf oxidized zone maximum width, 70m, Lb- nitrogen injection in goaf tubes rows away from,
30m；Work as n0When=3, flow divider 5 is four-way valve, and it is inboard 1. to infuse rear portion scraper-trough conveyer of 2 tunneling boring of nitrogen pipe along bracket rear portion for first
After laying, the note nitrogen pipe open end sequential connection of note nitrogen pipe 2 is set to pressure hose 3, flow divider 5, note nitrogen master in haulage gate
Pipeline 7, nitrogen-making device, note nitrogen flow divider 5 respectively outlet installs flowmeter, pressure gauge and control valve, with coal working face along
4 direction of propulsion of working face is advanced to away from goaf line of demarcation 8LKAfter distance, upper end, the lower end of working face 4 are blocked up
After leakage, the control valve of the note nitrogen pipe 2 is opened to goaf tunneling boring continuous nitrogen injection, 2. as coal working face 4 is along working face 4
Direction of propulsion is advanced to distance L between two note nitrogen pipes 2bNitrogen injection in goaf tubes rows away from when, repeat 1. method laying it is next
Root infuses nitrogen pipe 2, realizes next 2 goaf tunneling boring continuous nitrogen injection of note nitrogen pipe, and the method 3. repeated 2. realizes that third root infuses nitrogen
2 goaf tunneling boring continuous nitrogen injection of pipe.Work as n0When for other values, flow divider 5 is n0+ 1 port valve, method are analogized.
Wherein: working as n0When=3, when carrying out the 4th note nitrogen pipe 2 laying by the above process, first note nitrogen pipe 2 is cut off
Pressure hose 3 after access the 4th note nitrogen pipe 2, when carrying out the 5th note nitrogen pipe 2 by the above process and laying, cutting second
Access the 5th note nitrogen pipe 2 after infusing the pressure hose 3 of nitrogen pipe 2, and so on all goaf tunneling boring nitrogen injections of realization.
Work as n0When for other values, flow divider 5 is n0+ 1 port valve, method are analogized.
Wherein: LK﹥ r,
Lb=30m
In formula,
Lb- nitrogen injection in goaf tubes rows are away from m；
R-nitrogen dilation angle, m take 15m；
Pb5 branch outlet pressure of-flow divider, Pa take 250000Pa；
Pd4 air entering and returning pressure difference of-working face, Pa enter the wind wind pressure between direction 6 and working face return air direction 9 in working face
Difference takes 600Pa；
K-goaf porosity, takes 0.3；
QN7 nitrogen flow of-main line, m3/ min, takes 15m3/min；
QL- working face inleakage, m3/ min, takes, 5m3/min；
Vb5 branch exit velocity of-flow divider, m/min, 2544m/min.
Wherein: note nitrogen pipe 2 is note nitrogen pipe sealed end by one end, and the other end is the steel pipe composition for infusing nitrogen pipe open end, along note
L makes a call to the venthole of the nitrogen relief hole group 11 that one group is made of cell orifice 10, L=int (L to nitrogen pipe 2 at a certain distancez/n1)=
211/8=26m, L in formulazWorking face 4 is inclined to length, m；n111 quantity of-nitrogen relief hole group, group；n1=int (Lz/2r+1)
=int (211/ (2 × 15)+1)=8, r-nitrogen dilation angle in formula, m；The note number of nitrogen gas outlet cell orifice 10 is adopted when being six
The 10 radius R of cell orifice of the i-th group of nitrogen relief hole group 11 in dead zoneiIt is obtained by following formula:
In formula:
RiThe list for the i-th group of nitrogen relief hole group 11 in goaf that-every group 11 cell orifice 10 of nitrogen relief hole group number is six
First 10 radius of hole, mm, i value 1-n1Between integer, since 3 end of pressure hose；
P0Atmospheric pressure under-mark condition, Pa；
I-th group of i-goaf, 11 quantity of nitrogen relief hole group, value 1-n1Between integer；
D -2 radius of note nitrogen pipe, m.
I.e.
R1The 1st group of-goaf 11 cell orifice of nitrogen relief hole group, 10 radius, mm (i=1,2 ... ..., n1)；
It can similarly obtain,
R2=6.4mm；
R3=6.6mm；
R4=6.7mm；
R5=6.9mm；
R6=7.1mm；
R7=7.5mm；
R8=8.2mm
5th embodiment
Referring to Fig. 1, Fig. 2, a kind of fire extinguishing method of U-shaped ventilation operation face goaf tunneling boring curtain note nitrogen, comprising: root
Note nitrogen quantity is determined according to " coal mine nitrogen preventing and extinguishing fire technology specification " (MT/T701-1997) the 7.1st article regulation, specifically:
Wherein, Q0Inleakage in the oxidized zone of-goaf, m3/min；The general 1/60-1/100 by face air volume chooses；
After taking wind leaking stoppage measure, inleakage is estimated in the oxidized zone of goaf；
C1Average oxygen concentration in the oxidized zone of-goaf, %；
C2- goaf inerting fire prevention index, value are the critical oxygen concentration of coal spontaneous combustion, %；
CNThe nitrogen gas concn of-injection nitrogen, %；
K-reserve factor, takes 1.4.
Above formula input parameter can calculate note nitrogen quantity: QN=900m3/ h=15m3/min
Feature is: note nitrogen pipe 2 lays quantity n0=int (Ly/Lb+ 1)=int (70/30+1)=3, n in formula0- mined out
It infuses nitrogen pipe 2 and lays quantity, road in area；Ly- prediction goaf oxidized zone maximum width, 70m, Lb- nitrogen injection in goaf tubes rows away from,
30m；Work as n0When=3, flow divider 5 is four-way valve, and it is inboard 1. to infuse rear portion scraper-trough conveyer of 2 tunneling boring of nitrogen pipe along bracket rear portion for first
After laying, the note nitrogen pipe open end sequential connection of note nitrogen pipe 2 is set to pressure hose 3, flow divider 5, note nitrogen master in haulage gate
Pipeline 7, nitrogen-making device, note nitrogen flow divider 5 respectively outlet installs flowmeter, pressure gauge and control valve, with coal working face along
4 direction of propulsion of working face is advanced to away from goaf line of demarcation 8LKAfter distance, upper end, the lower end of working face 4 are blocked up
After leakage, the control valve of the note nitrogen pipe 2 is opened to goaf tunneling boring continuous nitrogen injection, 2. as coal working face 4 is along working face 4
Direction of propulsion is advanced to distance L between two note nitrogen pipes 2bNitrogen injection in goaf tubes rows away from when, repeat 1. method laying it is next
Root infuses nitrogen pipe 2, realizes next 2 goaf tunneling boring continuous nitrogen injection of note nitrogen pipe, and the method 3. repeated 2. realizes that third root infuses nitrogen
2 goaf tunneling boring continuous nitrogen injection of pipe.Work as n0When for other values, flow divider 5 is n0+ 1 port valve, method are analogized.
Wherein: working as n0When=3, when carrying out the 4th note nitrogen pipe 2 laying by the above process, first note nitrogen pipe 2 is cut off
Pressure hose 3 after access the 4th note nitrogen pipe 2, when carrying out the 5th note nitrogen pipe 2 by the above process and laying, cutting second
Access the 5th note nitrogen pipe 2 after infusing the pressure hose 3 of nitrogen pipe 2, and so on all goaf tunneling boring nitrogen injections of realization.
Work as n0When for other values, flow divider 5 is n0+ 1 port valve, method are analogized.
Wherein: LK﹥ r,
Lb=30m
In formula,
Lb- nitrogen injection in goaf tubes rows are away from m；
R-nitrogen dilation angle, m take 15m；
Pb5 branch outlet pressure of-flow divider, Pa take 250000Pa；
Pd4 air entering and returning pressure difference of-working face, Pa enter the wind wind pressure between direction 6 and working face return air direction 9 in working face
Difference takes 600Pa；
K-goaf porosity, takes 0.3；
QN7 nitrogen flow of-main line, m3/ min, takes 15m3/min；
QL- working face inleakage, m3/ min, takes, 5m3/min；
Vb5 branch exit velocity of-flow divider, m/min, 2544m/min.
Wherein: note nitrogen pipe 2 is note nitrogen pipe sealed end by one end, and the other end is the steel pipe composition for infusing nitrogen pipe open end, along note
L makes a call to the venthole of the nitrogen relief hole group 11 that one group is made of cell orifice 10, L=int (L to nitrogen pipe 2 at a certain distancez/n1)=
211/8=26m, L in formulazWorking face 4 is inclined to length, m；n111 quantity of-nitrogen relief hole group, group；n1=int (Lz/2r+1)
=int (211/ (2 × 15)+1)=8, r-nitrogen dilation angle in formula, m；The note number of nitrogen gas outlet cell orifice 10 is adopted when being six
The 10 radius R of cell orifice of the i-th group of nitrogen relief hole group 11 in dead zoneiIt is obtained by following formula:
In formula:
RiThe list for the i-th group of nitrogen relief hole group 11 in goaf that-every group 11 cell orifice 10 of nitrogen relief hole group number is six
First 10 radius of hole, mm, i value 1-n1Between integer, since 3 end of pressure hose；
P0Atmospheric pressure under-mark condition, Pa；
I-th group of i-goaf, 11 quantity of nitrogen relief hole group, value 1-n1Between integer；
D -2 radius of note nitrogen pipe, m.
I.e.
R1The 1st group of-goaf 11 cell orifice of nitrogen relief hole group, 10 radius, mm (i=1,2 ... ..., n1)；
It can similarly obtain,
R2=6.4mm；
R3=6.6mm；
R4=6.7mm；
R5=6.9mm；
R6=7.1mm；
R7=7.5mm；
R8=8.2mm
Wherein: when note 2 tunneling boring of nitrogen pipe is laid along the rear portion scraper-trough conveyer inboard at bracket rear portion, being protected with coal cinder or grillage
And it is anti-blocking using filter screen winding note nitrogen nitrogen relief hole group 11, the cell orifice 10 of nitrogen relief hole group 11 can be two to seven
When,
In formula: RniI-th group of goaf nitrogen releasing unit hole when the number of cell orifice 10 of-every group nitrogen relief hole group 11 is n
10 radius, mm, i value 1-n1Between integer, since 3 end of pressure hose；
RiThe list for the i-th group of nitrogen relief hole group 11 in goaf that-every group 11 cell orifice 10 of nitrogen relief hole group number is 6
First 10 radius of hole, mm, i value 1-n1Between integer, since 3 end of pressure hose；
10 numbers of cell orifice of every group of nitrogen relief hole group 11 of n-, value 2,3,4,5,7.Also exist when taking other numerical value
Among protection.
Such as: as n=5, Rn5=6.9 × (6/5)1/2=6.9 × 1.095=7.6mm.
Sha Jihai coal mine B1003W01 working face takes a kind of U-shaped ventilation operation face goaf tunneling boring during back production
Curtain infuses the fire extinguishing method of nitrogen, obtains applications well effect, effectively inhibits the low-temperature oxidation of Residual coal in goaf, greatly reduce
The number that CO transfinites in working face Air return corner, return, ensure that working face safe working.
Claims (10)
1. a kind of fire extinguishing method of U-shaped ventilation operation face goaf tunneling boring curtain note nitrogen, comprising: according to " coal mine nitrogen
Preventing and extinguishing fire technology specification " the 7.1st article of MT/T701-1997 of regulation determines main line nitrogen flow QN, note nitrogen pipe laying quantity n0
=int (Ly/Lb+ 1), n in formula0- nitrogen injection in goaf pipe lays quantity, road；Ly- prediction goaf oxidized zone maximum width, m,
Lb- nitrogen injection in goaf tubes rows are away from m；Work as n0When=3, flow divider is four-way valve, 1. by first note nitrogen pipe tunneling boring along bracket
After the rear portion scraper-trough conveyer inboard laying at rear portion, it is soft that the note nitrogen pipe open end sequential connection of note nitrogen pipe is set to the pressure resistance in haulage gate
Pipe, flow divider, note nitrogen main line, nitrogen-making device, note nitrogen flow divider, which respectively exports, installs flowmeter, pressure gauge and control valve, with
Coal working face is advanced to along advance of the face direction away from goaf line of demarcation LKAfter distance, to the upper end of working face,
After lower end carries out leak stopping, the control valve of the note nitrogen pipe is opened to goaf tunneling boring continuous nitrogen injection, 2. with coal working face
Distance L between two note nitrogen pipes is advanced to along advance of the face directionbNitrogen injection in goaf tubes rows away from when, repeat method 1.
Next note nitrogen pipe is laid, realizes next note nitrogen pipe goaf tunneling boring continuous nitrogen injection, the method 3. repeated 2. realizes third
Root infuses nitrogen pipe goaf tunneling boring continuous nitrogen injection, is characterized in that: working as n0When=3, when by the above process carry out the 4th note nitrogen pipe
When laying, the 4th note nitrogen pipe is accessed after cutting off the pressure hose of first note nitrogen pipe, is infused when carrying out the 5th by the above process
Nitrogen pipe lay when, cut off second note nitrogen pipe pressure hose after access the 5th note nitrogen pipe, and so on realization it is all mined out
Area's tunneling boring nitrogen injection.
2. a kind of fire extinguishing method of U-shaped ventilation operation face goaf tunneling boring curtain note nitrogen according to claim 1, special
Sign is: note nitrogen pipe by one end be note nitrogen pipe sealed end, the other end be infuse nitrogen pipe open end steel pipe constitute, along infuse nitrogen pipe every
Certain distance L makes a call to the venthole for the nitrogen relief hole group that one group is made of cell orifice, L=int (Lz/n1), L in formulazWorking face
It is inclined to length, m；n1- nitrogen relief hole group quantity, group；n1=int (Lz/ 2r+1), r-nitrogen dilation angle in formula, m；Infuse nitrogen
The unit pore radius R of i-th group of goaf nitrogen relief hole group when gas outlet unit hole count is sixiIt is obtained by following formula:
In formula:
RiThe unit pore radius for the i-th group of nitrogen relief hole group in goaf that-every group nitrogen relief hole group unit hole count is six,
Mm, i value 1-n1Between integer, since pressure hose end；
P0Atmospheric pressure under-mark condition, Pa；
I-th group of i-goaf nitrogen relief hole group quantity, value 1-n1Between integer；
D-note nitrogen pipe radius, m.
3. a kind of fire extinguishing method of U-shaped ventilation operation face goaf tunneling boring curtain note nitrogen according to claim 1,
It is characterized in that: LK﹥ r,
In formula,
Lb- nitrogen injection in goaf tubes rows are away from m；
R-nitrogen dilation angle, m；
Pb- flow divider branch outlet pressure, Pa；
Pd- working face air entering and returning pressure difference, Pa；
K-goaf porosity；
QN- main line nitrogen flow, m3/min；
QL- working face inleakage, m3/min；
Vb- flow divider branch exit velocity, m/min.
4. a kind of fire extinguishing method of U-shaped ventilation operation face goaf tunneling boring curtain note nitrogen according to claim 3,
Be characterized in that: note nitrogen pipe is note nitrogen pipe sealed end by one end, and the other end is the steel pipe composition for infusing nitrogen pipe open end, every along note nitrogen pipe
L makes a call to the venthole for the nitrogen relief hole group that one group is made of cell orifice, L=int (L at a certain distancez/n1), L in formulazWork
It is inclined to length, m in face；n1- nitrogen relief hole group quantity, group；n1=int (Lz/ 2r+1), r-nitrogen dilation angle in formula, m；Note
The unit pore radius R of i-th group of goaf nitrogen relief hole group when nitrogen gas outlet unit hole count is sixiIt is obtained by following formula:
In formula:
RiThe unit pore radius for the i-th group of nitrogen relief hole group in goaf that-every group nitrogen relief hole group unit hole count is six,
Mm, i value 1-n1Between integer, since pressure hose end；
P0Atmospheric pressure under-mark condition, Pa；
I-th group of i-goaf nitrogen relief hole group quantity, value 1-n1Between integer；
D-note nitrogen pipe radius, m.
5. a kind of fire extinguishing of U-shaped ventilation operation face goaf tunneling boring curtain note nitrogen according to claim 1 to 4
Method, it is characterised in that: when note nitrogen pipe tunneling boring is laid along the rear portion scraper-trough conveyer inboard at bracket rear portion, protected with coal cinder or grillage
It protects and uses filter screen winding note nitrogen nitrogen relief hole group anti-blocking, when the cell orifice of nitrogen relief hole group can be two to seven,
In formula: RniThe radius in the i-th group of nitrogen releasing unit hole in goaf when the unit hole count of-every group nitrogen relief hole group is n,
Mm, i value 1-n1Between integer, since pressure hose end；
Ri- every group nitrogen relief hole group unit hole count is the unit pore radius of a i-th group of nitrogen relief hole group in goaf, mm, i
Value 1-n1Between integer, since pressure hose end；
The cell orifice number of every group of nitrogen relief hole group of n-, value 2,3,4,5,7.
6. a kind of fire extinguishing method of U-shaped ventilation operation face goaf tunneling boring curtain note nitrogen, comprising: according to " coal mine nitrogen
Preventing and extinguishing fire technology specification " the 7.1st article of MT/T701-1997 of regulation determines main line nitrogen flow QN, note nitrogen pipe laying quantity n0
=int (Ly/Lb+ 1), n in formula0- nitrogen injection in goaf pipe lays quantity, road；Ly- prediction goaf oxidized zone maximum width, m,
Lb- nitrogen injection in goaf tubes rows are away from m；Work as n0When=3, flow divider is four-way valve, 1. by first note nitrogen pipe tunneling boring along bracket
After the rear portion scraper-trough conveyer inboard laying at rear portion, it is soft that the note nitrogen pipe open end sequential connection of note nitrogen pipe is set to the pressure resistance in haulage gate
Pipe, flow divider, note nitrogen main line, nitrogen-making device, note nitrogen flow divider, which respectively exports, installs flowmeter, pressure gauge and control valve, with
Coal working face is advanced to along advance of the face direction away from goaf line of demarcation LKAfter distance, to the upper end of working face,
After lower end carries out leak stopping, the control valve of the note nitrogen pipe is opened to goaf tunneling boring continuous nitrogen injection, 2. with coal working face
Distance L between two note nitrogen pipes is advanced to along advance of the face directionbNitrogen injection in goaf tubes rows away from when, repeat method 1.
Next note nitrogen pipe is laid, realizes next note nitrogen pipe goaf tunneling boring continuous nitrogen injection, the method 3. repeated 2. realizes third
Root infuses nitrogen pipe goaf tunneling boring continuous nitrogen injection, it is characterised in that: LK﹥ r,
In formula,
Lb- nitrogen injection in goaf tubes rows are away from m；
R-nitrogen dilation angle, m；
Pb- flow divider branch outlet pressure, Pa；
Pd- working face air entering and returning pressure difference, Pa；
K-goaf porosity；
QN- main line nitrogen flow, m3/min；
QL- working face inleakage, m3/min；
Vb- flow divider branch exit velocity, m/min.
7. a kind of fire extinguishing method of U-shaped ventilation operation face goaf tunneling boring curtain note nitrogen according to claim 6,
Be characterized in that: note nitrogen pipe is note nitrogen pipe sealed end by one end, and the other end is the steel pipe composition for infusing nitrogen pipe open end, every along note nitrogen pipe
L makes a call to the venthole for the nitrogen relief hole group that one group is made of cell orifice, L=int (L at a certain distancez/n1), L in formulazWork
It is inclined to length, m in face；n1- nitrogen relief hole group quantity, group；n1=int (Lz/ 2r+1), r-nitrogen dilation angle in formula, m；Note
The unit pore radius R of i-th group of goaf nitrogen relief hole group when nitrogen gas outlet unit hole count is sixiIt is obtained by following formula:
In formula:
RiThe unit pore radius for the i-th group of nitrogen relief hole group in goaf that-every group nitrogen relief hole group unit hole count is six,
Mm, i value 1-n1Between integer, since pressure hose end；
P0Atmospheric pressure under-mark condition, Pa；
I-th group of i-goaf nitrogen relief hole group quantity, value 1-n1Between integer；
D-note nitrogen pipe radius, m.
8. according to a kind of fire extinguishing of any U-shaped ventilation operation face goaf tunneling boring curtain note nitrogen of claim 6-7
Method, it is characterised in that: when note nitrogen pipe tunneling boring is laid along the rear portion scraper-trough conveyer inboard at bracket rear portion, protected with coal cinder or grillage
It protects and uses filter screen winding note nitrogen nitrogen relief hole group anti-blocking, when the cell orifice of nitrogen relief hole group can be two to seven,
In formula: RniThe radius in the i-th group of nitrogen releasing unit hole in goaf when the unit hole count of-every group nitrogen relief hole group is n,
Mm, i value 1-n1Between integer, since pressure hose end；
Ri- every group nitrogen relief hole group unit hole count is the unit pore radius of a i-th group of nitrogen relief hole group in goaf, mm, i
Value 1-n1Between integer, since pressure hose end；
The cell orifice number of every group of nitrogen relief hole group of n-, value 2,3,4,5,7.
9. a kind of fire extinguishing method of U-shaped ventilation operation face goaf tunneling boring curtain note nitrogen, comprising: according to " coal mine nitrogen
Preventing and extinguishing fire technology specification " the 7.1st article of MT/T701-1997 of regulation determines main line nitrogen flow QN, note nitrogen pipe laying quantity n0
=int (Ly/Lb+ 1), n in formula0- nitrogen injection in goaf pipe lays quantity, road；Ly- prediction goaf oxidized zone maximum width, m,
Lb- nitrogen injection in goaf tubes rows are away from m；Work as n0When=3, flow divider is four-way valve, 1. by first note nitrogen pipe tunneling boring along bracket
After the rear portion scraper-trough conveyer inboard laying at rear portion, it is soft that the note nitrogen pipe open end sequential connection of note nitrogen pipe is set to the pressure resistance in haulage gate
Pipe, flow divider, note nitrogen main line, nitrogen-making device, note nitrogen flow divider, which respectively exports, installs flowmeter, pressure gauge and control valve, with
Coal working face is advanced to along advance of the face direction away from goaf line of demarcation LKAfter distance, to the upper end of working face,
After lower end carries out leak stopping, the control valve of the note nitrogen pipe is opened to goaf tunneling boring continuous nitrogen injection, 2. with coal working face
Distance L between two note nitrogen pipes is advanced to along advance of the face directionbNitrogen injection in goaf tubes rows away from when, repeat method 1.
Next note nitrogen pipe is laid, realizes next note nitrogen pipe goaf tunneling boring continuous nitrogen injection, the method 3. repeated 2. realizes third
Root infuses nitrogen pipe goaf tunneling boring continuous nitrogen injection, it is characterised in that: note nitrogen pipe is note nitrogen pipe sealed end by one end, and the other end is note
The steel pipe of nitrogen pipe open end is constituted, and along note nitrogen pipe, L makes a call to nitrogen relief hole group that one group is made of cell orifice at a certain distance
Venthole, L=int (Lz/n1), L in formulazWorking face is inclined to length, m；n1- nitrogen relief hole group quantity, group；n1=int
(Lz/ 2r+1), r-nitrogen dilation angle in formula, m；Infuse i-th group of goaf nitrogen release when nitrogen gas outlet unit hole count is six
The unit pore radius R of hole groupiIt is obtained by following formula:
In formula:
RiThe unit pore radius for the i-th group of nitrogen relief hole group in goaf that-every group nitrogen relief hole group unit hole count is six,
Mm, i value 1-n1Between integer, since pressure hose end；
P0Atmospheric pressure under-mark condition, Pa；
I-th group of i-goaf nitrogen relief hole group quantity, value 1-n1Between integer；
D-note nitrogen pipe radius, m.
10. a kind of fire extinguishing method of U-shaped ventilation operation face goaf tunneling boring curtain note nitrogen according to claim 9,
It is characterized by: being protected simultaneously when note nitrogen pipe tunneling boring is laid along the rear portion scraper-trough conveyer inboard at bracket rear portion with coal cinder or grillage
It is anti-blocking using filter screen winding note nitrogen nitrogen relief hole group, when the cell orifice of nitrogen relief hole group can be two to seven,
In formula: RniThe radius in the i-th group of nitrogen releasing unit hole in goaf when the unit hole count of-every group nitrogen relief hole group is n,
Mm, i value 1-n1Between integer, since pressure hose end；
Ri- every group nitrogen relief hole group unit hole count is the unit pore radius of a i-th group of nitrogen relief hole group in goaf, mm, i
Value 1-n1Between integer, since pressure hose end；
The cell orifice number of every group of nitrogen relief hole group of n-, value 2,3,4,5,7.
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| CN106761893A (en) * | 2017-03-04 | 2017-05-31 | 辽宁工程技术大学 | A kind of coal mine roadway fire extinguishing system |
| CN109060599A (en) * | 2018-09-18 | 2018-12-21 | 中国矿业大学(北京) | Low temperature nitrogen migration rule simulation experiment platform and experimental method in coal mine gob |
| CN112879074A (en) * | 2021-04-07 | 2021-06-01 | 安徽理工大学 | Positive and negative pressure inert injection method and system for rapid fire prevention and extinguishing in goaf |
| CN113217073B (en) * | 2021-06-08 | 2024-04-02 | 北京天地华泰矿业管理股份有限公司 | Pre-buried double-pipe stepping type goaf nitrogen injection method |
| CN113482697A (en) * | 2021-08-17 | 2021-10-08 | 华能铜川照金煤电有限公司西川煤矿分公司 | Nitrogen injection fire protection device and measure for goaf during fully mechanized mining face withdrawal period |
| CN114856678B (en) * | 2022-05-16 | 2022-11-22 | 中国矿业大学(北京) | Distributed type dragging pipe continuous nitrogen injection fire prevention and extinguishing method and system for goaf under coal mining condition |
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| CN202325684U (en) * | 2011-11-01 | 2012-07-11 | 淮南矿业(集团)有限责任公司 | Fire-protection automatic monitoring device for underground mined-out area of coal mine |
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