CN106761893A - A kind of coal mine roadway fire extinguishing system - Google Patents
A kind of coal mine roadway fire extinguishing system Download PDFInfo
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- CN106761893A CN106761893A CN201710125567.5A CN201710125567A CN106761893A CN 106761893 A CN106761893 A CN 106761893A CN 201710125567 A CN201710125567 A CN 201710125567A CN 106761893 A CN106761893 A CN 106761893A
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- nitrogen
- goaf
- note
- air
- fire extinguishing
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- 239000003245 coal Substances 0.000 title claims abstract description 30
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 253
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 125
- 238000002485 combustion reaction Methods 0.000 claims abstract description 19
- 230000002269 spontaneous effect Effects 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000001301 oxygen Substances 0.000 claims abstract description 14
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 14
- 238000000926 separation method Methods 0.000 claims abstract description 9
- 238000000746 purification Methods 0.000 claims abstract description 8
- 239000012528 membrane Substances 0.000 claims abstract description 5
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 230000001105 regulatory effect Effects 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 230000010339 dilation Effects 0.000 claims description 6
- 230000002265 prevention Effects 0.000 claims description 5
- 238000009423 ventilation Methods 0.000 claims description 5
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 4
- 239000002817 coal dust Substances 0.000 claims description 3
- 150000004767 nitrides Chemical class 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 239000002023 wood Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 claims 1
- 230000009466 transformation Effects 0.000 claims 1
- 238000001179 sorption measurement Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 11
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- 238000005065 mining Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000008033 biological extinction Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 206010003497 Asphyxia Diseases 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007619 statistical method Methods 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
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)
- Fire-Extinguishing Compositions (AREA)
Abstract
The invention discloses a kind of coal mine roadway fire extinguishing system, it is characterised in that the preparation method of mine nitrogen mainly has 3 kinds of cryogenic air separation unit, pressure-variable adsorption and UF membrane；3 kinds of principles of method are all to be separated to extract nitrogen by the oxygen and nitrogen in air；Cryogenic air separation unit formula is, using the air air inlet compressor after filter purification, after several levels are compressed and cool down, to be dehydrated in purification, treater is purified, expander step-down, is exchanged heat repeatedly by heat exchange, liquefied into fractionating column through reducing pressure by regulating flow again, nitrogen is isolated in rectifying from air.Can be used to colliery spontaneous combustion administer.
Description
Technical field
The present invention relates to mining safety, more particularly to colliery spontaneous combustion is administered.
Background technology
In the last few years, with the development of China's integrated release top coal coal-mining technique, the coal production of China increases year by year.But
At the same time, with the popularization and application of mining technology, the mining rate of mine is also increasing, and Residual coal in goaf is also got over
Come more, leak out increasingly severe.These factors increase the possibility of spontaneous combustion in goaf.To the safety in production band in mine
Great challenge is carried out.Be can be seen that in China's State owned coal mine according to related data statistical analysis, Conflagration Caused by Coal Self-ignition
Number of times accounts for more than the 90% of whole mine fire number of times, wherein, spontaneous combustion in goaf number of times accounts for whole mine coal Self-burning
More than the 60% of calamity number of times.Therefore, will play heavy to closing to the safety in production in mine to the research for preventing and treating spontaneous combustion in goaf
The effect wanted.At present, the technology of preventing and treating spontaneous combustion in goaf mainly has grouting preventing and extinguishing fire technology, Gel fire extinguishing technology, three
Phase foam preventing and extinguishing fire technology, the technology of fire prevention and extinction by nitrogen injection etc..Wherein, the technology of fire prevention and extinction by nitrogen injection is that preventing and treating spontaneous combustion in goaf most has
One of measure of effect.
The content of the invention
1. a kind of coal mine roadway fire extinguishing system, it is characterised in that the preparation method of mine nitrogen mainly has cryogenic air separation unit,
3 kinds of pressure-variable adsorption and UF membrane；3 kinds of principles of method are all to be separated to extract nitrogen by the oxygen and nitrogen in air；
Cryogenic air separation unit formula is, using the air air inlet compressor after filter purification, after several levels are compressed and cool down, to be dehydrated in purification,
Treater is purified, expander step-down, is exchanged heat repeatedly by heat exchange, then is liquefied into fractionating column through reducing pressure by regulating flow, rectifying,
Nitrogen is isolated from air.Can be used to colliery spontaneous combustion administer.
2. a kind of coal mine roadway fire extinguishing system according to claim 1, it is characterised in that the nitrogen of this method production
Gas purity is high, but this method from start start machine it is long to the time span for producing nitrogen, generally require 8h~
12h, and unit needs to be used in the environment of high pressure, and equipment not easy care consumes energy more.
3. a kind of coal mine roadway fire extinguishing system according to claim 1, it is characterised in that (1) because will note nitrogen pipe paving
It is located in air intake crossheading, note nitrogen liberation port is located in goaf；(2) nitrogen liberation port should be higher than that base plate, with 90 ° of crankles to mined out
Area, and working face keeping parallelism, and chopped etc. with stone or wood and be protected by；(3) the distance between nitrogen liberation port, should be according to adopting
The bandwidth of dead zone three, note nitrogen mode and note nitrogen intensity, the effective dilation angle of nitrogen, face-airing amount, spontaneous combustion time, work
The combined factors such as face advance rate and erecting dense individual props situation determine；(4) rational note nitrogen parameter is selected；(5) determine optimal logical
Air quantity；Its principle is that the oxygen concentration in goaf is restricted to minimum degree, and nitrogen gas concn reaches maximum, and face gas are not
Transfinite, do not produce the coal dust that swims.
4. a kind of coal mine roadway fire extinguishing system according to claim 1, it is characterised in that it is determined that nitrogen quantity is most preferably noted,
Its principle is that nitrogen usage amount is minimum under conditions of effectively preventing and treating Study on Protection of Spontaneous Combustion, reduces prevent fires into greatest extent
This；It is determined that most preferably noting nitrogen liberation port, its principle is that liberation port should be located at the centre of nitride strip or be located at inlet air gallery base plate
On.
5. a kind of coal mine roadway fire extinguishing system according to claim 1, it is characterised in that goaf nitrogen quantity is really
It is fixed：Calculated by ton coal note nitrogen quantity 5m3：Q=5 × A/ (300 × 24) × k；Calculated by gas bearing capacity：Q=60 × (Q × C)/(1-
C)；Calculated by goaf oxidized zone oxygen content：
6. a kind of coal mine roadway fire extinguishing system according to claim 1, it is characterised in that note nitrogen mouthful position should root
Determine according to following condition：The size of coal propensity and the length of spontaneous combustion time；Effective dilation angle of nitrogen；Work
Face draft type and ventilation size；The bandwidth size of goaf three；Note nitrogen mode and note nitrogen intensity size etc..
Specific embodiment
1. method for preparing nitrogen
The preparation method of mine nitrogen mainly has 3 kinds of cryogenic air separation unit, pressure-variable adsorption and UF membrane.3 kinds of principles of method are all
It is to be separated to extract nitrogen by the oxygen and nitrogen in air.Cryogenic air separation unit formula is to enter empty using the air after filter purification
Air compressor, after several levels are compressed and cool down, is dehydrated in purification, treater purifying, expander step-down, by heat exchange
Exchange heat repeatedly, then liquefied into fractionating column through reducing pressure by regulating flow, nitrogen is isolated in rectifying from air.The nitrogen of this method production
Gas purity is high, but this method from start start machine it is long to the time span for producing nitrogen, generally require 8h~
12h, and unit needs to be used in the environment of high pressure, and equipment not easy care consumes energy more.Pressure swing adsorption method is 20th century 70
A technology newly developed after age, this method work different with the gas diffusion velocity of oxygen come separation of nitrogen using nitrogen
Skill is simple, shorter to the nitrogen time is isolated from start machine, but rate of recovery of nitrogen is low, and cost of manufacture is high.Membrane separation technique
It is newest nitrogen technology processed, this method rate of recovery of nitrogen is high, but required corollary equipment is more, and maintenance capacity is big.
2. nitrogen injection technique
According to mine actual conditions, may be selected such as bet nitrogen mode.
Note nitrogen can be divided into continuity note nitrogen and discontinuity note nitrogen from the time, and working face removes frame with stopping adopting at the back production initial stage
Period, or because suffering that the reasons such as geology crushed zone, electromechanical equipment cause the advance of the face slow, preferably use continuity to note nitrogen, work
During making the normal back production in face, discontinuity is preferably used to note nitrogen.
Being divided according to note nitrogen passage has nitrogen injection with buried pipe and trustship note nitrogen.
Nitrogen injection with buried pipe is to bury a note nitrogen pipeline in the inlet side goaf of working face, is started after certain length is imbedded
Note nitrogen, while in embedment Article 2 note nitrogen pipeline, when Article 2 note nitrogen line portals embedment goaf oxidized zone and the friendship of cooling zone
To nitrogen injection in goaf during boundary position, while stopping the first note nitrogen of pipeline, and note nitrogen pipeline is buried again, so circulation, directly
Having been adopted to working face.
Trustship note nitrogen is to bury the note nitrogen pipe of certain length in the inlet side goaf of working face, and its movement is mainly utilized
The hydraulic support of working face, or face conveyor head, tail, or the drawing hoist of working face inlet side draw.Note nitrogen pipe
Road is moved with the propulsion of working face, it is imbedded all the time in the oxidized zone of goaf.
Nitrogen is noted in either nitrogen injection with buried pipe or trustship, and the position of the embedded and nitrogen liberation port of note nitrogen pipe should meet as follows will
Ask：
(1) because note nitrogen pipe is laid in air intake crossheading, note nitrogen liberation port is located in goaf.
(2) nitrogen liberation port should be higher than that base plate, with 90 ° of crankles to goaf, and working face keeping parallelism, and with stone or
Wood chops etc. and to be protected by.
(3) the distance between nitrogen liberation port, should note nitrogen mode and note nitrogen intensity, nitrogen according to the bandwidth of goaf three
Effective dilation angle, face-airing amount, spontaneous combustion time, the combined factors such as advance of the face degree and erecting dense individual props situation
It is determined that.
(4) rational note nitrogen parameter is selected.
(5) optimal ventilation amount is determined；Its principle is that the oxygen concentration in goaf is restricted to minimum degree, nitrogen gas concn
Maximum is reached, face gas do not transfinite, and do not produce the coal dust that swims
It is determined that most preferably noting nitrogen quantity；Its principle is that nitrogen usage amount is most under conditions of effectively preventing and treating Study on Protection of Spontaneous Combustion
It is few, fire prevention cost is reduced to greatest extent.
It is determined that most preferably noting nitrogen liberation port；Its principle is that liberation port should be located at the centre of nitride strip or be located at inlet air gallery
On base plate.
3. the determination of nitrogen injection in goaf parameter
(1) determination of goaf nitrogen quantity
Fire extinguishing note nitrogen quantity in goaf can press ton coal note nitrogen quantity respectively, gas bearing capacity, oxygen content calculating in oxidized zone, and
Adjusted by Work places oxygen concentration.
By ton coal note nitrogen quantity 5m3Calculate
Q=5 × A/ (300 × 24) × k
In formula:Q- note nitrogen intensity (m3/h)；
K- coal mining yield accounts for the ratio of total output.
Calculated by gas bearing capacity
Q=60 × (Q × C)/(1-C)
In formula:Q- note nitrogen intensity (m3/h)；
Q- adopts face air quantity (m3/min)；
C- adopts gas density (%) in the air -return duct of face.
Calculated by goaf oxidized zone oxygen content
Inleakage, m in Q0-goaf oxidized zone in formula3/min；
C1-goaf internal oxidition band averaged Oxygen content, is taken as 15%；
C2-goaf oxidized zone fire prevention inerting index, is taken as 7%；
Nitrogen gas purity during Cn-injecting nitrogen, is taken as 98%；
K-nitrogen feeding pipe road loss coefficient, is 1.1~1.2, is taken as 1.1
N-advance of the face degree coefficient, is 2 during less than the 20m/ months；The 20m/ months~30m/ is 1.5 during the month；The 30m/ months~40m/ the months
When be 1.2；It is 1 more than the 40m/ months；It is taken as 1；
R-Coal Spontaneous Combustion Period 1~3 month is 1.3,3~6 months for more than 1,6 months is 0.8；It is taken as 1.3.
(2) determination of note nitrogen mouthful position
Note nitrogen mouthful position should determine according to following condition：
1. the length of the size of coal propensity and spontaneous combustion time；
2. effective dilation angle of nitrogen；
3. face-airing mode and ventilation size；
4. the bandwidth size of goaf three；
5. nitrogen mode and note nitrogen intensity size etc. are noted.
4. nitrogen injection points for attention
(1) sufficient nitrogen supply (NS) is ensured.Ensure there is sufficiently stable nitrogen supply (NS) source, should typically have not less than normal
The standby nitrogen source of more than 1 times of consumption.
(2) the reasonable design of the mode of movement and pipe network of correct selection nitrogen.Nitrogen is only referred to by feeding according to quantity on time
Determine place, can just play effective fire extinguishing effect.Should ensure that pipeline reaches decanting point when the design of nitrogen-filling system is carried out
Distance should be most short, straight to make friction loss minimum small with pipeline consumption.
(3) suitable note nitrogen technology and technique is selected.
(4) rational note nitrogen parameter is selected.
(5) leakage of goaf nitrogen is prevented, on the one hand smooth base works unfavorable to goaf fire extinguishing, on the other hand
It is likely to cause the generation of the accidents such as personnel's asphyxia.Therefore, goaf nitrogen anti-leak work is carried out particularly significant.Generally, prevent
Only the method for goaf smooth base is that goaf and two gallerys particularly intake entry are blocked near working face side.
Claims (6)
1. a kind of coal mine roadway fire extinguishing system, it is characterised in that the preparation method of mine nitrogen mainly has cryogenic air separation unit, transformation
3 kinds of absorption and UF membrane；3 kinds of principles of method are all to be separated to extract nitrogen by the oxygen and nitrogen in air；Deep cooling
Space division formula is, using the air air inlet compressor after filter purification, after several levels are compressed and cool down, to be dehydrated in purification, pure
Device is purified, expander step-down, is exchanged heat repeatedly by heat exchange, then is liquefied into fractionating column through reducing pressure by regulating flow, rectifying, from sky
Nitrogen is isolated in gas, be can be used for colliery spontaneous combustion and administered.
2. a kind of coal mine roadway fire extinguishing system according to claim 1, it is characterised in that the nitrogen of this method production is pure
Degree is high, but this method is long to the time span for producing nitrogen from start machine is started, and generally requires 8h~12h,
And unit needs to be used in the environment of high pressure, equipment not easy care consumes energy more.
3. a kind of coal mine roadway fire extinguishing system according to claim 1, it is characterised in that (1) because note nitrogen pipe is laid on
In air intake crossheading, note nitrogen liberation port is located in goaf；(2) nitrogen liberation port should be higher than that base plate, with 90 ° of crankles to goaf,
With working face keeping parallelism, and chopped etc. with stone or wood and be protected by；(3) the distance between nitrogen liberation port, should be according to mined out
The bandwidth of area three, note nitrogen mode and note nitrogen intensity, the effective dilation angle of nitrogen, face-airing amount, spontaneous combustion time, working face
The combined factors such as advance rate and erecting dense individual props situation determine；(4) rational note nitrogen parameter is selected；(5) optimal ventilation is determined
Amount；Its principle is that the oxygen concentration in goaf is restricted to minimum degree, and nitrogen gas concn reaches maximum, and face gas do not surpass
Limit, does not produce the coal dust that swims.
4. a kind of coal mine roadway fire extinguishing system according to claim 1, it is characterised in that it is determined that most preferably noting nitrogen quantity, it is former
It is then that nitrogen usage amount is minimum under conditions of effectively preventing and treating Study on Protection of Spontaneous Combustion, fire prevention cost is reduced to greatest extent；Really
Fixed optimal note nitrogen liberation port, its principle is that liberation port should be located at the centre of nitride strip or be located on inlet air gallery base plate.
5. a kind of coal mine roadway fire extinguishing system according to claim 1, it is characterised in that the determination of goaf nitrogen quantity：
Calculated by ton coal note nitrogen quantity 5m3：Q=5 × A/ (300 × 24) × k；Calculated by gas bearing capacity：Q=60 × (Q × C)/(1-C)；
Calculated by goaf oxidized zone oxygen content：
6. a kind of coal mine roadway fire extinguishing system according to claim 1, it is characterised in that note nitrogen mouthful position should be according to such as
Lower condition determines：The size of coal propensity and the length of spontaneous combustion time；Effective dilation angle of nitrogen；Working face leads to
Wind mode and ventilation size；The bandwidth size of goaf three；Note nitrogen mode and note nitrogen intensity size etc..
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| CN201710125567.5A CN106761893A (en) | 2017-03-04 | 2017-03-04 | A kind of coal mine roadway fire extinguishing system |
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| CN201710125567.5A CN106761893A (en) | 2017-03-04 | 2017-03-04 | A kind of coal mine roadway fire extinguishing system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108733923A (en) * | 2018-05-21 | 2018-11-02 | 湖南科技大学 | Goaf nitrogen based on minimal flow unit fills Calculation of pressure loss method |
| CN110792466A (en) * | 2019-11-13 | 2020-02-14 | 大同煤矿集团有限责任公司 | Fire prevention and extinguishing method for mining in coal mine fire area |
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| CN108733923A (en) * | 2018-05-21 | 2018-11-02 | 湖南科技大学 | Goaf nitrogen based on minimal flow unit fills Calculation of pressure loss method |
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| CN110792466A (en) * | 2019-11-13 | 2020-02-14 | 大同煤矿集团有限责任公司 | Fire prevention and extinguishing method for mining in coal mine fire area |
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