CN104594937B - Ventilation method for use during mining of easily spontaneous combustion coal seam face - Google Patents
Ventilation method for use during mining of easily spontaneous combustion coal seam face Download PDFInfo
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- CN104594937B CN104594937B CN201510040322.3A CN201510040322A CN104594937B CN 104594937 B CN104594937 B CN 104594937B CN 201510040322 A CN201510040322 A CN 201510040322A CN 104594937 B CN104594937 B CN 104594937B
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- 238000009423 ventilation Methods 0.000 title claims abstract description 58
- 239000003245 coal Substances 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000005065 mining Methods 0.000 title claims abstract description 17
- 230000002269 spontaneous effect Effects 0.000 title claims abstract description 15
- 238000002485 combustion reaction Methods 0.000 title abstract description 7
- 230000005641 tunneling Effects 0.000 claims abstract description 7
- 230000033228 biological regulation Effects 0.000 claims description 33
- 238000003780 insertion Methods 0.000 claims description 19
- 230000037431 insertion Effects 0.000 claims description 19
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 14
- 230000002265 prevention Effects 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 7
- 239000001569 carbon dioxide Substances 0.000 claims description 7
- 238000010276 construction Methods 0.000 claims description 7
- 241000209094 Oryza Species 0.000 claims description 4
- 235000007164 Oryza sativa Nutrition 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 235000009566 rice Nutrition 0.000 claims description 4
- 239000007921 spray Substances 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 2
- 230000002452 interceptive effect Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims 2
- 230000004888 barrier function Effects 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000011435 rock 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
- 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
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/10—Air doors
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Ventilation (AREA)
Abstract
The invention relates to a ventilation method for use during mining of an easily spontaneous combustion coal seam face, and aims to effectively solve the problems of severe deformation, great difficulty in maintenance and long air-returning path due to the influence of stopping dynamic pressure on a roadway caused by instability of the conventional air-returning system. According to the technical scheme, the ventilation method comprises the following steps: (1) tunneling a waist lane; (2) tunneling a face air-returning lane; (3) tunneling a face roadway; (4) building a ventilation facility; (5) normally ventilating of the face; (6) forming a ventilation route on the face; (7) returning air locally on the face; (8) forming a local air returning route; (9) retracting a top plate and forming anti-fire boreholes. Through the design of a blind shaft, the method has the characteristics of simple air returning circuit and stable ventilation system; maintenance is not required basically; the anti-fire boreholes are formed, so that the fire-resistance difficulty at the retracting period of the face is lowered, and the retracting working period of the face is shortened; the ventilation method is an innovation in the aspect of ventilation methods for the easily spontaneous combustion coal seam face.
Description
Technical field
The present invention relates to Safety of Coal Mine Production field, particularly a kind of method of ventilation of exploitation spontaneous fire seam work surface.
Background technology
According to " mine fire extinguishing specification " with regard to the serious exploiting field of exploitation freely burning fire or work surface, it is considered as setting up local
The regulation of inverted ventilation system, the arrangement of spontaneous fire seam work surface pays the utmost attention to perfect local inverted ventilation system.Because of coal-face
Lane up and down be all arranged in coal seam, its air return system adopt the upper (lower) mountain of return air, return air connection roadway or air crossing with special
Return airway is connected composition.Return air inclined gallery, return air connection roadway or air crossing are arranged in coal seam, and these tunnels are subject to the shadow of ore deposit pressure
Ring big, deformation is serious, safeguard very difficult, return air circuit is also longer, and air return system is very unstable simultaneously, be therefore badly in need of catching logical
Wind fireproof basic link, adheres to simplifying the principle of ventilating system, designs a kind of more reliable and more stable method of ventilation to replace
Original system is imperative.
Content of the invention
For above-mentioned situation, for solving the defect of prior art, the purpose of the present invention is exactly to provide a kind of exploitation easy spontaneous combustion
The method of ventilation of working face of coal seam, can be affected by back production dynamic pressure in the unstable tunnel leading to of the existing air return system of effectively solving,
Deformation is serious, safeguards very difficult, the also longer problem of return air circuit simultaneously.
The technical scheme that the present invention solves is to comprise the following steps: the 1) driving in waist lane；2) pick in tailentry road
Enter；3) driving of roadway workface；4) the constructing of ventilation equipment；5) work surface is normally divulged information；6) face-airing route；7) work
Make face local inverted ventilation；8) local inverted ventilation route；9) withdraw face roof construction fire prevention boring.
The present invention passes through dark vertical design and makes method of ventilation have return air circuit simply, the stable feature of ventilating system；
Substantially do not need to safeguard, the setting of fire prevention boring reduces work surface and withdraws phase fire prevention difficulty, shortens work surface and withdraws the duration, is
Innovation on the method for ventilation of exploitation spontaneous fire seam work surface.
Brief description
Fig. 1 is the spontaneous fire seam face-airing system schematic of the present invention.
Fig. 2 is embodiments of the invention 21102 face-airing system schematic.
Specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Be given by Fig. 1, the present invention comprises the following steps:
1) tunnel a waist lane parallel with cutting eye beyond work surface design stops adopting line first, waist lane is arranged in work surface
Design stops adopting 40-60 rice beyond line；
2) tunnel the top return air connection roadway of a 10-20 rice in waist lane near exploiting field return airway side opening, top is returned
After wind connection roadway driving puts in place, downwards the driving dark vertical of return air to exploiting field return airway same level after, tunnel bottom return air
Connection roadway is connected with exploiting field return airway, makes top return air connection roadway, the dark vertical of return air, bottom return air connection roadway and exploiting field return air
Lane insertion, completes the driving in tailentry road；
3) the upper lane of driving face, to Dutch eye position, is tunneled downwards and is cut an epimere, and the lower lane driving of work surface reaches
Cut a position, driving is cut section now and secretly stood with cutting an epimere insertion, Shi Shang lane, Xia Xiang, Yao Xiang, top return air connection roadway, return air
Well, bottom return air connection roadway and exploiting field return airway insertion, complete the driving of roadway workface, in the upper and lower lane driving of work surface
Period first tunnels waist lane, top return air connection roadway, dark vertical, bottom return air connection roadway, constitutes work surface air return system, reduces pick
Series ventilation phenomenon during entering；
4) before bottom return air connection roadway and return air dark vertical insertion, one group of two-ways regulation of section arrangement the upper lane of work surface outside
Air door, outside lower lane, section arranges one group of normally opened air door, and bottom return air connection roadway arranges one group of two-ways regulation air door it is ensured that tunneling ventilation
System stability is reliable, before working face open-off cut eye insertion, arranges one group of two-ways regulation air door, one group of normally opened air door in waist lane, three groups double
Constitute ventilating system to damper and two groups of normally opened air doors, complete constructing of all ventilation equipments of work surface；
5) when face-airing, close and close two groups of lane Wai Duanheyao lane two-ways regulation air door (1,2 groups), make tunnel wind speed
Meet v >=0.15m/s, open section outside lower lane, the normally opened air door in two groups of waist lane (4,5 groups), close the two-way tune of bottom return air connection roadway
Section air door (3 groups), makes work surface wind speed meet the requirement of " coal mine methods of air quantity estimation ", specifically: work surface is actual to be needed
Wind Coverage Calculation,
(1) press meteorological condition to calculate
qcf=60×70%×vcf×scf×kch×kclFormula 1)
In formula:
vcfThe wind speed of coal-face；
scfThe average effective basal area of coal-face；
kchCoal-face mining height regulation coefficient；
kclCoal-face length adjustment coefficient；
70% available ventilation section factor；
60 coefficients producing for unit conversion；
(2) calculate according to gas emission
qcf=100×q cg×k cgFormula 2)
In formula:
q cgThe distinguished and admirable middle average absolute gas amount of coal-face return airway；
k cgThe uneven standby air volume coefficient of coal-face Gas；
100 are not to be exceeded 1% conversion coefficient by the concentration of gas in coal-face return；
(3) calculate according to carbon dioxide outburst amount
qcf=67×q cc×k ccFormula 3)
In formula:
q ccDistinguished and admirable middle average absolute co of coal-face return airway2Outburst amount；
k ccCoal-face co2Gush out uneven standby air volume coefficient；
67 press co in coal-face return2Concentration be not to be exceeded 1.5% conversion coefficient；
(4) press crew numbers to check
qcf≥4n cfFormula 4)
In formula:
n cfTake coal face most numbers when relieving；
4 everyone required airflows, m3/min；
(5) checked by wind speed
1. check minimum air quantity
qcf≥60×0.25s cbFormula 5)
s cb=l cb×h cf× 70% formula 6)
In formula:
scbCoal-face maximum control top effective cross sectional area, m2；
lcbThe coal-face maximum distance of face roof under control, m；
hcfThe actual mining height of coal-face, m；
The minimum windspeed that 0.25 coal-face allows, m/s；
70% available ventilation section factor；
2. check maximum quantity of wind
qcf≤60×4.0s csFormula 7)
scs=lcs×hcf× 70% formula 8)
In formula:
scsCoal-face minimum control top effective cross sectional area；
hcfThe actual mining height of coal-face；
lcsThe coal-face minimum distance of face roof under control；
The maximum wind velocity that 4.0 coal-faces allow；
70% available ventilation section factor；
3. fully-mechanized coalface, after taking the measure such as coal-bed flooding and coal miner spray depositing dust, checking computations are
Wind Volume
qcf≤60×5.0scsFormula 9)
scs=lcs×hcf× 70% formula 10)
In formula:
The maximum wind velocity that 5.0 coal-faces allow, m/s；Work surface be actually needed air quantity should be greater than meteorological condition, watt
This, carbon dioxide specifies the maximum quantity of wind that calculates, and meets the checking computations of staff, minimum air quantity and maximum quantity of wind；
6) face-airing route is: the upper lane → waist of the lower lane → work surface → work surface of exploiting field air intake lane → work surface
Lane → dark the vertical of top return air connection roadway → return air → bottom return air connection roadway → exploiting field return airway；
7) when work surface local inverted ventilation, close the lower normally opened air door in two groups of lane Wai Duanheyao lane (4,5 groups), make tunnel wind speed
Meet v >=0.15m/s, open two groups of lane Wai Duanheyao lane two-ways regulation air door (1,2 groups), close bottom return air connection roadway double
To damper (3 groups), in 10min, after inverted ventilation action, change the wind direction in tunnel, after wind direction changes, its wind
Amount should be not less than the 40% of normal air quantity；
8) work surface inverted ventilation route is: lane → waist lane under lane → work surface → work surface on exploiting field air intake lane → work surface →
The top return air connection roadway → dark vertical of return air → bottom return air connection roadway → exploiting field return airway；
9) it is arranged in parallel fire prevention boring to stopping adopting rear face roof using waist lane, to reduce work surface, to withdraw phase fire prevention difficult
Degree.
In force, details are as follows taking 21102 work surfaces that applicant is exploited as a example for the present invention:
21102 work surfaces are provided by Fig. 2,21102 work surfaces be located at the 21 panel Mei Guixia Shanxi wings, the 4th from top to bottom
Work surface.Work surface can adopt strike length 967m, tilts long 193.5m, and 21102 fully mechanized coal face institute mining coal seams are in Jurassic system
System hypomere Yi ma formation 23 coal, coal seam has spontaneous combustion tendency, belongs to easy spontaneous combustion, and spontaneous combustion tendency grade is class.Method of ventilation
Specifically include following steps:
1) on 21102 work surfaces, 110 meters of arrival Yao Xiang positions are tunneled from exploiting field air intake lane (21 area pedestrians are gone down the hill) opening in lane,
Waist lane is arranged in work surface and stops adopting 50 meters beyond line；
2) Jue30 meter Yao lane epimere reaches 21102 return air connection roadway positions, and 20 meters of driving top return air connection roadway reaches back
Wind dark vertical position, the dark vertical of 41 meters of return air of driving, under 21102 work surfaces, lane is from exploiting field air intake lane (21 area pedestrians are gone down the hill) opening
112 meters of arrival Yao Xiang positions of driving, dig 163.5 meter Yao lane hypomeres and have tunneled the epimere insertion of waist lane, 21102 return air connection roadways are certainly
130 meters of exploiting field return airway (21 area's return air are gone down the hill) opening driving bottom return air connection roadway and return air dark vertical insertion, complete work
The driving of face return aircourse；
3) lane is tunneled 1020 meters and is arrived Dutch eye position on 21102, and driving cuts 70 meters of an epimere downwards, and 21102 time lane is tunneled
1028 meters are arrived Dutch eye position, and driving is cut 123.5 meters of eye and cut an insertion with epimere, complete roadway workface driving；
4), before the insertion of bottom return air connection roadway and the dark vertical of return air, outside lane on work surface, section arranges one group of two-ways regulation
Air door, outside lower lane, section arranges one group of normally opened air door, and bottom return air connection roadway arranges one group of two-ways regulation air door it is ensured that tunneling ventilation
System stability is reliable, and one group of two-ways regulation air door, one group of normally opened air door are arranged in working face open-off cut eye insertion Qian Yao lane, complete work
The constructing of all ventilation equipments in face；
5) 21102 work surfaces adopt lower lane air intake, and the full negative pressure ascensional ventilation mode of upper lane return air, when work surface just needs
During normal open wind, close and close two groups of lane Wai Duanheyao lane two-ways regulation air door, open section outside lower lane, the normally opened air door in two groups of waist lane, close
Close and adjust bottom return air connection roadway two-ways regulation air door, make face air volume be 950 m3/ min(presses " coal mine air volume meter
Calculation method " draw)；
6) face-airing route is, fresh air: exploiting field air intake lane (21 area pedestrians are gone down the hill) → 21102 times lane → work surfaces；
Idle air: on work surface → 21102, lane → 21102 waist lane → 21102 return air top connection roadway → 21102 return air secretly stands
Well → 21102 bottom return air connection roadway → exploiting field return airway (21 area's return air are gone down the hill)；
7) when work surface needs local inverted ventilation, close the normally opened air door in lower two groups of lane Wai Duanheyao lane, open section outside lane
With two groups of waist lane two-ways regulation air door, close and adjust bottom return air connection roadway two-ways regulation air door, so that face air volume is more than
400 m3/min；
8) inverted ventilation route in local is, fresh air: lane → work surface in exploiting field air intake lane (21 area pedestrians are gone down the hill) → 21102；
Idle air: lower lane → 21102 waist lane → 21102 return air top connection roadway → 21102 in work surface → 21102 return air secretly stands
Well → 21102 bottom connection roadway → exploiting field return airway (21 area's return air are gone down the hill)；
9) it is arranged in parallel fire prevention boring to stopping adopting rear face roof using waist lane, from waist lane with 15 ° of elevations angle every 10 meters
To stopping adopting rear 20 56 meters deep fire prevention borings of face roof parallel construction, big flow cementing operations are carried out by this boring,
Decrease work surface and remove equipment and interfering during construction FPE parallel operations, and provide for FPE quality
Ensure, remove to work surface and won valuable time.
In order to ensure the reliability of ventilating system, every group of described two-ways regulation air door, every group of normally opened air door are 2.
Attached:
1st, face air volume calculates
The actual required airflow of 21102 work surfaces calculates
(1) press meteorological condition to calculate
qcf=60×70%×vcf×scf×kch×kcl=60×70%×1.1×12.87×1.2×1.3=927.57m3/
min
In formula:
vcfThe wind speed of coal-face, this work surface air intake temperature is less than 22 DEG C, takes 1.1m/s；
scfThe average effective basal area of coal-face, takes 12.87 m2；
kchCoal-face mining height regulation coefficient, belongs to mining back production, takes 1.2；
kclCoal-face length adjustment coefficient, cuts the long 193.5m of eye, takes 1.3；
70% available ventilation section factor；
60 coefficients producing for unit conversion；
(2) calculate according to gas emission
qcf=100×q cg×k cg=100 × 1.8 × 1.19=214.2m3/min
In formula:
q cgThe distinguished and admirable middle average absolute gas amount of coal-face return airway, 1.8m3/min；
k cgThe uneven standby air volume coefficient of coal-face Gas, takes 1.19；
100 are not to be exceeded 1% conversion coefficient by the concentration of gas in coal-face return；
(3) calculate according to carbon dioxide outburst amount
qcf=67×q cc×k cc=67 × 2.7 × 1.15=208m3/min
In formula:
q ccDistinguished and admirable middle average absolute co of coal-face return airway2Outburst amount, takes 2.7m3/min；
k ccCoal-face co2Gush out uneven standby air volume coefficient, take 1.15；
67 press co in coal-face return2Concentration be not to be exceeded 1.5% conversion coefficient；
(4) press crew numbers to check
qcf≥4n cf=324m3/min
In formula:
n cfTake coal face most numbers, 81 people when relieving；
4 everyone required airflows, m3/min；
(5) checked by wind speed
1. check minimum air quantity
qcf≥60×0.25s cb=142.5m3/min
s cb=l cb×h cf×70%=5.2×2.6×70%=9.5 m2
In formula:
scbCoal-face maximum control top effective cross sectional area, m2；
lcbThe coal-face maximum distance of face roof under control, takes 5.2m；
hcfThe actual mining height of coal-face, takes 2.6m；
The minimum windspeed that 0.25 coal-face allows, m/s；
70% available ventilation section factor；
2. check maximum quantity of wind
qcf≤60×4.0s cs=2064m3/min
scs=lcs×hcf×70%=4.7×2.6×70%=8.6 m2
In formula:
scsCoal-face minimum control top effective cross sectional area, m2；
hcfThe actual mining height of coal-face, takes 2.6m；
lcsThe coal-face minimum distance of face roof under control, takes 4.7m；
The maximum wind velocity that 4.0 coal-faces allow, m/s；
70% available ventilation section factor；
3. fully-mechanized coalface, after taking the measure such as coal-bed flooding and coal miner spray depositing dust, checking computations are
Wind Volume
qcf≤60×5.0scs=2580 m3/min
scs=lcs×hcf×70%=4.7×2.6×70%=8.6 m2
In formula:
The maximum wind velocity that 5.0 coal-faces allow, m/s；
Work surface is actually needed that air quantity should be greater than meteorological condition, gas, carbon dioxide specify the maximum quantity of wind that calculates, and full
The checking computations of sufficient staff, minimum air quantity and maximum quantity of wind；Determine that 21102 work surface air distribution amounts are by above calculating and checking computations
950 m3/min.
Due to the stability of dark vertical and return air connection roadway country rock, using bolt-spary supports, the later stage does not need the present invention substantially
Safeguard, make method of ventilation have return air circuit simply by the design of dark vertical, the stable feature of ventilating system；The arrangement in waist lane
Meet and also can optimize retreating side fire control plan, reduce back again to withdrawing surface construction fire prevention boring outside work surface inverted ventilation needs
Remove the FPE amount in face, shorten and withdraw the duration.Decrease work surface and remove equipment and construction FPE parallel operations
When interfere, be that FPE quality provides guarantee, remove to work surface and won valuable time, be exploitation easily from
Innovation in coal-fired layer face-airing method, has good economic and social benefit.
Claims (3)
1. a kind of method of ventilation of exploitation spontaneous fire seam work surface is it is characterised in that comprise the following steps:
1) tunnel a waist lane parallel with cutting eye beyond work surface design stops adopting line first, waist lane is arranged in work surface design
Stop adopting 40-60 rice beyond line；
2) tunnel the top return air connection roadway of a 10-20 rice in waist lane near exploiting field return airway side opening, top return air joins
After network lane driving puts in place, downwards the driving dark vertical of return air to exploiting field return airway same level after, the return air contact of driving bottom
Lane is connected with exploiting field return airway, so that top return air connection roadway, the dark vertical of return air, bottom return air connection roadway and exploiting field return airway is passed through
Logical, complete the driving in tailentry road；
3) the upper lane of driving face, to Dutch eye position, is tunneled downwards and is cut an epimere, Dutch eye is tunneled in the lower lane of work surface
Position, driving cut now section with cut an epimere insertion, Shi Shang lane, Xia Xiang, Yao Xiang, top return air connection roadway, the dark vertical of return air, under
Portion's return air connection roadway and exploiting field return airway insertion, complete the driving of roadway workface, during the upper and lower lane driving of work surface first
Driving waist lane, top return air connection roadway, dark vertical, bottom return air connection roadway, constitute work surface air return system, during reducing driving
Series ventilation phenomenon；
4) before bottom return air connection roadway and return air dark vertical insertion, one group of two-ways regulation wind of section arrangement the upper lane of work surface outside
Door, section arranges one group of normally opened air door in lower the lane outside, and return air connection roadway one group of two-ways regulation air door of arrangement in bottom is it is ensured that tunneling ventilation system
System is reliable and stable, before working face open-off cut eye insertion, arranges one group of two-ways regulation air door, one group of normally opened air door in waist lane, three groups two-way
Damper and two groups of normally opened air doors constitute ventilating system；
5) when face-airing, close close two groups of lane Wai Duanheyao lane two-ways regulation air door, make tunnel wind speed meet v >=
0.15m/s, opens section outside lower lane, the normally opened air door in two groups of waist lane, closes bottom return air connection roadway two-ways regulation air door, makes work surface
Air quantity meets the requirement of " coal mine methods of air quantity estimation ", specifically: the actual required airflow of work surface calculates,
(1) press meteorological condition to calculate
qcf=60×70%×vcf×scf×kch×kclFormula 1),
In formula:
vcfThe wind speed of coal-face；
scfThe average effective basal area of coal-face；
kchCoal-face mining height regulation coefficient；
kclCoal-face length adjustment coefficient；
70% available ventilation section factor；
60 coefficients producing for unit conversion；
(2) calculate according to gas emission
qcf=100×q cg×k cgFormula 2)
In formula:
q cgThe distinguished and admirable middle average absolute gas amount of coal-face return airway；
k cgThe uneven standby air volume coefficient of coal-face Gas；
100 are not to be exceeded 1% conversion coefficient by the concentration of gas in coal-face return；
(3) calculate according to carbon dioxide outburst amount
qcf=67×q cc×k ccFormula 3)
In formula:
q ccDistinguished and admirable middle average absolute co of coal-face return airway2Outburst amount；
k ccCoal-face co2Gush out uneven standby air volume coefficient；
67 press co in coal-face return2Concentration be not to be exceeded 1.5% conversion coefficient；
(4) press crew numbers to check
qcf≥4n cfFormula 4)
In formula:
n cfTake coal face most numbers when relieving；
4 everyone required airflows, m3/min；
(5) checked by wind speed
1. check minimum air quantity
qcf≥60×0.25s cbFormula 5)
s cb=l cb×h cf× 70% formula 6)
In formula:
scbCoal-face maximum control top effective cross sectional area, m2；
lcbThe coal-face maximum distance of face roof under control, m；
hcfThe actual mining height of coal-face, m；
The minimum windspeed that 0.25 coal-face allows, m/s；
70% available ventilation section factor；
2. check maximum quantity of wind
qcf≤60×4.0s csFormula 7)
scs=lcs×hcf× 70% formula 8)
In formula:
scsCoal-face minimum control top effective cross sectional area；
hcfThe actual mining height of coal-face；
lcsThe coal-face minimum distance of face roof under control；
The maximum wind velocity that 4.0 coal-faces allow；
70% available ventilation section factor；
3. fully-mechanized coalface, after taking coal-bed flooding and coal miner spray measurements for reduction, checks maximum quantity of wind
qcf≤60×5.0scsFormula 9)
scs=lcs×hcf× 70% formula 10)
In formula:
The maximum wind velocity that 5.0 coal-faces allow, m/s；Work surface be actually needed air quantity should be greater than meteorological condition, gas,
Carbon dioxide specifies the maximum quantity of wind calculating, and meets the checking computations of staff, minimum air quantity and maximum quantity of wind；
6) face-airing route is successively: exploiting field air intake lane, the lower lane of work surface, work surface, the Shang Xiang of work surface, Yao Xiang,
Top return air connection roadway, the dark vertical of return air, bottom return air connection roadway, exploiting field return airway；
7) when work surface local inverted ventilation, close the normally opened air door in lower two groups of lane Wai Duanheyao lane, make tunnel wind speed meet v >=
0.15m/s, opens two groups of lane Wai Duanheyao lane two-ways regulation air door, closes bottom return air connection roadway two-ways regulation air door, instead
Change the wind direction in tunnel in 10min, after wind direction changes, its air quantity should be not less than normal air quantity after pneumatic work
40%；
8) inverted ventilation route in local is successively: on exploiting field air intake lane, work surface, lane, work surface, work surface Xia Xiang, Yao Xiang, top are returned
The dark vertical of wind connection roadway, return air, bottom return air connection roadway, exploiting field return airway；
9) it is arranged in parallel fire prevention boring to stopping adopting rear face roof using waist lane, withdraw phase fire prevention difficulty to reduce work surface.
2. the method for ventilation of exploitation spontaneous fire seam work surface according to claim 1 is it is characterised in that include following walking
Rapid:
1) first on work surface, 110 meters of arrival Yao Xiang positions are tunneled from exploiting field air intake lane opening in lane, and waist lane is arranged in work surface
Stop adopting 50 meters beyond line；
2) Jue30 meter Yao lane epimere reaches return air connection roadway position, 20 meters of arrival return air dark vertical positions of driving top return air connection roadway
Put, the dark vertical of 41 meters of return air of driving, under work surface, 112 meters of arrival Yao Xiang positions are tunneled from exploiting field air intake lane opening in lane, dig 163.5
Meter Yao lane hypomere with tunneled the epimere insertion of waist lane, return air connection roadway is from exploiting field return airway opening driving bottom return air connection roadway
130 meters and return air dark vertical insertion, complete the driving in tailentry road；
3) upper lane is tunneled 1020 meters and is arrived Dutch eye position, and driving cuts 70 meters of an epimere downwards, and lower lane is tunneled 1028 meters and arrived Dutch eye
Position, driving is cut 123.5 meters of eye and is cut an insertion with epimere, completes roadway workface driving；
4), before the insertion of bottom return air connection roadway and the dark vertical of return air, outside lane on work surface, section arranges one group of two-ways regulation wind
Door, outside lower lane, section arranges one group of normally opened air door, and bottom return air connection roadway arranges that one group of two-ways regulation air door ensures tunneling ventilation system
System is reliable and stable, and one group of two-ways regulation air door, one group of normally opened air door are arranged in working face open-off cut eye insertion Qian Yao lane, complete work surface
The constructing of all ventilation equipments；
5) work surface adopts lower lane air intake, the full negative pressure ascensional ventilation mode of upper lane return air, when work surface needs normal ventilation,
Two groups of lane Wai Duanheyao lane two-ways regulation air door is closed in pass, opens section outside lower lane, the normally opened air door in two groups of waist lane, closes and adjust down
Portion's return air connection roadway two-ways regulation air door, makes face air volume be 950 m3/ min, specifically, work surface actual required airflow meter
Calculate:
(1) press meteorological condition to calculate
qcf=60×70%×vcf×scf×kch×kcl=60×70%×1.1×12.87×1.2×1.3=927.57m3/min
In formula:
vcfThe wind speed of coal-face, this work surface air intake temperature is less than 22 DEG C, takes 1.1m/s；
scfThe average effective basal area of coal-face, takes 12.87 m2；
kchCoal-face mining height regulation coefficient, belongs to mining back production, takes 1.2；
kclCoal-face length adjustment coefficient, cuts the long 193.5m of eye, takes 1.3；
70% available ventilation section factor；
60 coefficients producing for unit conversion；
(2) calculate according to gas emission
qcf=100×q cg×k cg=100 × 1.8 × 1.19=214.2m3/min
In formula:
q cgThe distinguished and admirable middle average absolute gas amount of coal-face return airway, 1.8m3/min；
k cgThe uneven standby air volume coefficient of coal-face Gas, takes 1.19；
100 are not to be exceeded 1% conversion coefficient by the concentration of gas in coal-face return；
(3) calculate according to carbon dioxide outburst amount
qcf=67×q cc×k cc=67 × 2.7 × 1.15=208m3/min
In formula:
q ccDistinguished and admirable middle average absolute co of coal-face return airway2Outburst amount, takes 2.7m3/min；
k ccCoal-face co2Gush out uneven standby air volume coefficient, take 1.15；
67 press co in coal-face return2Concentration be not to be exceeded 1.5% conversion coefficient；
(4) press crew numbers to check
qcf≥4n cf=324m3/min
In formula:
n cfTake coal face most numbers, 81 people when relieving；
4 everyone required airflows, m3/min；
(5) checked by wind speed
1. check minimum air quantity
qcf≥60×0.25s cb=142.5m3/min
s cb=l cb×h cf×70%=5.2×2.6×70%=9.5 m2
In formula:
scbCoal-face maximum control top effective cross sectional area, m2；
lcbThe coal-face maximum distance of face roof under control, takes 5.2m；
hcfThe actual mining height of coal-face, takes 2.6m；
The minimum windspeed that 0.25 coal-face allows, m/s；
70% available ventilation section factor；
2. check maximum quantity of wind
qcf≤60×4.0s cs=2064m3/min
scs=lcs×hcf×70%=4.7×2.6×70%=8.6 m2
In formula:
scsCoal-face minimum control top effective cross sectional area, m2；
hcfThe actual mining height of coal-face, takes 2.6m；
lcsThe coal-face minimum distance of face roof under control, takes 4.7m；
The maximum wind velocity that 4.0 coal-faces allow, m/s；
70% available ventilation section factor；
3. fully-mechanized coalface, after taking coal-bed flooding and coal miner spray measurements for reduction, checks maximum quantity of wind
qcf≤60×5.0scs=2580 m3/min
scs=lcs×hcf×70%=4.7×2.6×70%=8.6m2
In formula:
The maximum wind velocity that 5.0 coal-faces allow, m/s,
Determine that work surface air distribution amount is 950m by above calculating and checking computations3/min；
6) face-airing route is, fresh air is successively: exploiting field air intake lane, Xia Xiang, work surface；
Idle air is successively: work surface, Shang Xiang, Yao Xiang, return air top connection roadway, the dark vertical of return air, bottom return air connection roadway, exploiting field
Return airway, South Mountain ventilating shaft, ground；
7) when work surface needs local inverted ventilation, close the normally opened air door in lower two groups of lane Wai Duanheyao lane, open section and waist outside lane
Two groups of lane two-ways regulation air door, closes and adjusts bottom return air connection roadway two-ways regulation air door, make face air volume be more than 400
m3/min；
8) inverted ventilation route in local is, fresh air is successively: exploiting field air intake lane, Shang Xiang, work surface；
Idle air is successively: work surface, Xia Xiang, Yao Xiang, return air top connection roadway, the dark vertical of return air, bottom connection roadway, exploiting field return air
Lane, South Mountain ventilating shaft, ground；
9) be arranged in parallel fire prevention boring to stopping adopting rear face roof using waist lane, from waist lane with 15 ° of elevations angle every 10 meters to stopping
Adopt rear 20 56 meters deep fire prevention borings of face roof parallel construction, big flow cementing operations are carried out to this fire prevention boring, subtracts
Lack work surface and removed equipment and interfering during construction FPE parallel operations, be that FPE quality provides guarantor
Barrier, removes to work surface and has won valuable time.
3. the method for ventilation of exploitation spontaneous fire seam work surface according to claim 1 and 2 is it is characterised in that described
Every group of two-ways regulation air door, every group of normally opened air door are 2.
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