CN102777201B - Ventilation method for exploiting short distance coal bed in fire zone based on positive pressure ventilation system - Google Patents
Ventilation method for exploiting short distance coal bed in fire zone based on positive pressure ventilation system Download PDFInfo
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Abstract
The invention discloses a ventilation method for exploiting short distance coal bed in a fire zone based on a positive pressure ventilation system. The method is established on the basis of the positive pressure ventilation system and comprises the following steps of: firstly, on the basis of judging connectivity between a coalface and an upper part fire zone, determining danger that harmful gas of the upper part fire zone abnormally flows into an operation face exists; determining an area with a lowest pressure energy of the operation face, namely, a safe pressure range at a position of a air returning corner; determining wind resistance from the air returning corner to an air returning air window of the coalface through ventilation parametric measurement of the coalface and a law of conservation of energy; finally calculating a differential pressure safe regulation interval of the air returning air window of the positive pressure system of the coalface; afterwards, on the basis of the differential pressure safe regulation interval of the air returning air window and combined with an automatic control technology, therefore, real-time automatic regulation control of the air returning air window and alarming by an alarm can be realized when a differential pressure before and after the air returning air window on coalface is changed and when an air pressure is changed suddenly caused by collapse of a large area of a top plate of an upper goaf, and safe exploitation on the coalface can be ultimately ensured.
Description
Technical field
The present invention relates to safety of coal mines exploitation field, particularly short range seam mining method of ventilation under a kind of flame range based on positive draft system.
Background technology
The coal seam resource of the western many mines of China is buried more shallow, and little Yao colliery, top grows, and because little kiln colliery managerial confusion, production technology fall behind, lack geologic information simultaneously, so that private is adopted, coyoting is serious, also the super layer of exploitation of crossing the border often.The mining type that small coal mine adopts house column type more or adopts with pick generation, the rate of extraction is low, something lost coal is many, and communicate with each other in tunnel, surface subsidence is serious, and the oxygen supply of leaking out has for a long time produced the large-area spontaneous combustion of coal seam flame range in many places.When underlying seam exploitation, under the impact of adopting, the passage that leaks out of top flame range increases, in having aggravated top flame range development, also often face the danger that the toxic and harmfuls such as the interior CO of top flame range pour in work plane extremely, formed serious threat to the safety in production of underlying seam work plane.According to statistics, the mine fire that the exploitation of little kiln is caused accounts for the more than 95% of freely burning fire, and because contiguous seams coal-face top flame range has the features such as the passage of leaking out is many and complicated, Air-Leakage Law is relatively disorderly, high temp fire source point disguise is strong, brought great difficulty to anti-fire-fighting work.At present in the time of the flame range of reply contiguous seams top, mainly contain spontaneous fire forecasting technique, fire source probing technology and preventing and extinguishing fire technology, wherein spontaneous fire forecasting technique is the effective means of prediction spontaneous combustion in goaf degree and scope, mainly comprise thermometry, index gas analytic approach etc., and because the passage that leaks out is many, monitoring range is limited, monitor temperature and gas anomaly during in Goaf of Close Distance Coal Seams, high temperature flame range often forms, so that anti-fire-fighting work is very passive; Fire source probing technology is mainly to determine high temp fire source position and the scope of top flame range, and then carry out targetedly the anti-fire-fighting work of top flame range, mainly comprise radio wave method, radar method, double base trace method, resistivity method, isotope survey radon method etc., but because top flame range influence basin is large, the passage complexity of leaking out, before top flame range develops into a certain degree, be often difficult to accurately determine high temp fire source region.At present, the preventing and extinguishing fire technology of application comparative maturity mainly contains the anti-fire extinguishing of slip casting, the anti-fire extinguishing of gel, the anti-fire extinguishing of retardant, inert gas for fire extinguishing, pressure balance for air control and wind leaking stoppage technology etc., but because high temp fire source point can not promptly and accurately be determined, Air-Leakage Law complexity, bring very large blindness and hysteresis quality to fire-fighting work, extinguish material cost is higher simultaneously, complex process, can not meet the needs of large area quick extinguishing and emergent fire extinguishing, often occurs having high input, the situation of weak effect.Therefore be badly in need of the method for contiguous seams coal-face safe working under a kind of guarantee flame range economic, practical, with strong points, prevent that top flame range pernicious gas from pouring in contiguous seams coal-face, control the development of top flame range, ensure contiguous seams coal-face safety and high efficiency under flame range.
Summary of the invention
The object of the present invention is to provide short range seam mining method of ventilation under a kind of flame range based on positive draft system, to ensure the safe back production of contiguous seams under flame range.
Its technical solution is:
A short range seam mining method of ventilation under flame range based on positive draft system, it comprises the following steps:
(1) judge coal-face and top flame range connectedness;
According to caving zone, fissure zone design formulas, calculate contiguous seams coal-face caving zone height H
1, fissure zone height H
2, and then show that contiguous seams coal-face fissure zone number range is H
1~ H
2, measure contiguous seams coal-face and goaf, top spacing is H
3; As numerical value H
3be positioned at fissure zone number range H
1~ H
2outside time, illustrate that coal-face and top flame range do not exist connected relation, the toxic and harmful of top flame range does not possess the channel condition that pours in coal-face; As numerical value H
3be positioned at fissure zone number range H
1~ H
2within time, illustrate that coal-face and top flame range possess connected relation, there is the possibility that pours in coal-face in the toxic and harmful of top flame range;
(2) possess connected relation in the case of meeting coal-face and the top flame range described in (1), determine the safe range of coal-face Air return corner place gas pressure;
Air return corner is as the minimum region of coal-face pressure energy, if ensure, top flame range pernicious gas cannot pour in work plane, only need guarantee that pernicious gas cannot pour in work plane Air return corner, simultaneously also need to prevent that coal-face from having to leak out enters goaf, top by Air return corner, the development of aggravation top flame range; Comprehensive above situation, in goaf not when occurrence of large-area roof caving, the gas pressure P of coal-face Air return corner place
cornersecurity interval be (P
0+ ρ gh, P
0+ 2 ρ gh);
Wherein: p
0---the gas pressure in goaf, top, Pa;
The local atmospheric density of ρ---mine, kg/m
3;
G---acceleration of gravity, N/kg;
H---contiguous seams spacing, m;
(3) evaluation work face Air return corner is to the windage of return air air regulator;
Face-airing system ventilation parameter is measured, and according to following formula evaluation work face Air return corner the tunnel windage to return air air regulator section;
Wherein: R
12---Air return corner is to the tunnel windage of return air air regulator section, kg/m
7;
P
corner---work plane Air return corner place gas pressure, Pa;
P
2---the gas-static before return air air regulator, Pa;
V
1, v
2be respectively the wind speed before Air return corner, return air air regulator, m/s;
ρ
1, ρ
2be respectively the distinguished and admirable density before Air return corner, return air air regulator, kg/m
3;
Z
1, z
2be respectively the absolute altitude before Air return corner, return air air regulator, m;
Q---coal-face air quantity, m
3/ s;
(4) calculate between the safe regulatory region of pressure reduction of return air air regulator in coal-face positive draft system;
For ensureing being perfectly safe of coal-face back production, consider 40% rich coefficient, the pressure balance face in Air return corner and goaf, top is controlled to interval
the gas pressure that is Air return corner place need meet:
Convolution (1) and formula (2) can draw, in goaf, top not when occurrence of large-area roof caving, in coal-face positive draft system, before and after return air air regulator, between the safe regulatory region of pressure reduction, is:
Wherein: P
return air---the gas-static after return air air regulator, Pa;
Gas-static before Δ P---return air air regulator and after return air air regulator is poor;
(5) install baroceptor and warning device;
At coal-face return air air regulator, place installs the first baroceptor, the situation of change of pressure reduction before and after the first baroceptor monitoring return air air regulator; In coal-face air entering and returning crossheading, install the second baroceptor, the air pressure sudden change situation in the second baroceptor monitoring goaf, top; The first baroceptor is all connected with data acquisition unit with the second baroceptor, and data acquisition unit is connected with automatic control unit, and automatic control unit is connected with return air air regulator, warning device respectively;
Regulate safely interval value according to the return air air regulator pressure reduction calculating in step (4), in automatic control unit, set air regulator automatic control program, in the time there is not large area caving in goaf, top, automatic control unit is according to the variation of pressure difference before and after the first baroceptor institute survey time wind air regulator, regulate in real time return air air regulator, return air air regulator front and back pressure difference is positioned between safe regulatory region all the time; In addition, in control module, set alarming value, in the time there is large area roof caving in goaf, top, the second baroceptor monitors pressure jump value and exceedes predefined alarming value, warning device is reported to the police, and work plane operating personnel withdraw from, and return air air regulator is closed, in the time that pressure jump value returns to normal value, return air air regulator is adjusted to normal condition.
Useful technique effect of the present invention is:
First the present invention is judging on the basis of coal-face and top flame range connectedness, specify top flame range pernicious gas and have the danger that extremely pours in work plane, then in conjunction with the actual conditions of coal-face, determine that work plane pressure energy lowermost extent is the safe pressure scope at Air return corner place, and then determine the windage of coal-face Air return corner to return air air regulator section by ventilation parameter measurement and the law of conservation of energy of coal-face, finally calculate between the safe regulatory region of pressure reduction of coal-face positive draft system return air air regulator, then taking between the safe regulatory region of pressure reduction of return air air regulator as foundation, realize the real-time auto-adjustment control of return air air regulator and the alarm equipment alarm in the time that coal-face return air air regulator front and back pressure reduction changes with the sudden change of goaf, top large area roof caving initiation air pressure in conjunction with automatic control technology, the safe working of ultimate guarantee coal-face.The present invention is based on coal-face positive draft system made, workable, practicality is high, can effectively instruct and ensure the safe and efficient back production of contiguous seams coal-face under flame range, overcomes blindness and the hysteresis quality of conventional method.
Brief description of the drawings
Fig. 1 is that goaf, contiguous seams coal-face top large area roof caving CO pours in coal-face schematic diagram;
Fig. 2 is coal-face positive draft system schematic;
Fig. 3 is coal-face baroceptor and warning device arrangement diagram;
Fig. 4 is coal-face return air air regulator control system flow chart.
Detailed description of the invention
The present invention is based on coal-face positive draft system made, on to the judgement basis of contiguous seams coal-face and top flame range connectedness, specify coal-face top flame range pernicious gas and extremely pour in the degree of danger of work plane, and in conjunction with the actual conditions of coal-face, determine the safe pressure scope at work plane pressure energy lowermost extent (Air return corner place), then determine the energy loss of coal-face by coal-face ventilation parameter measurement and law of conservation of energy, calculate between the safe regulatory region of pressure reduction of return air air regulator, and real-time auto-adjustment control while realizing in conjunction with automatic control technology that (inside and outside) pressure reduction before and after coal-face return air air regulator changes and goaf, top large area roof caving causes air pressure sudden change on this basis, the safe and efficient back production of ultimate guarantee coal-face, detailed process illustrates by reference to the accompanying drawings as follows:
(1) judge coal-face and top flame range connectedness;
According to caving zone, fissure zone design formulas, calculate contiguous seams coal-face caving zone height H
1, fissure zone height H
2, and then show that contiguous seams coal-face fissure zone number range is H
1~ H
2, measure contiguous seams coal-face and goaf, top spacing is H
3; As numerical value H
3be positioned at fissure zone number range H
1~ H
2outside time, illustrate that coal-face and top flame range do not possess connected relation, the toxic and harmful of top flame range does not possess the channel condition that pours in coal-face; As numerical value H
3be positioned at fissure zone number range H
1~ H
2within time, illustrate that coal-face and top flame range possess connected relation, there is the possibility that pours in coal-face in the toxic and harmful of top flame range.As shown in Figure 1,1-caving zone, 2-fissure zone, goaf, 3-work plane top; H
1for work plane caving zone height, H
3for work plane and goaf, top spacing, M is superjacent mining height, H
2the height of part fissure zone is only shown, the calculated value of fissure zone height may be much larger than the height value marking in Fig. 1.
(2) possess connected relation in the case of meeting coal-face and the top flame range described in (1), determine the safe range of coal-face Air return corner place gas pressure;
Air return corner is as the minimum region of coal-face pressure energy, if ensure, top flame range pernicious gas cannot pour in work plane, only need guarantee that pernicious gas cannot pour in work plane Air return corner, simultaneously also need to prevent that coal-face from having to leak out enters goaf, top by Air return corner, the development of aggravation top flame range; Comprehensive above situation, in goaf not when occurrence of large-area roof caving, the gas pressure P of coal-face Air return corner place
cornersecurity interval be (P
0+ ρ gh, P
0+ 2 ρ gh);
Wherein: p
0---the gas pressure in goaf, top, Pa;
The local atmospheric density of ρ---mine, kg/m
3;
G---acceleration of gravity, N/kg;
H---contiguous seams spacing, m;
In the time of the occurrence of large-area roof caving of goaf, top, if will ensure, top flame range pernicious gas cannot pour in work plane, only need guarantee that Air return corner place gas pressure meets following formula:
In formula: p
0---the gas pressure in disaster generation front upper part goaf, Pa;
The local atmospheric density of ρ---mine, kg/m
3;
G---acceleration of gravity, N/kg;
H---contiguous seams spacing, i.e. contiguous seams coal-face and goaf, top spacing, m;
V
0---impact air-flow initial time speed, m/s;
ρ
d---the density of goaf top plate rock stratum, top, kg/m
3;
L
1, L
2, h
1---be respectively the length and width of roof caving block and thick, m.
V
0---the volume of impact air-flow disaster finish time is mainly the volume in goaf, roof caving region, top, m
3;
M---superjacent mining height, i.e. the vertical drop distance of top board block, m;
Z---t moment top board block distance of fall, m;
T---impact air-flow generation time, s;
λ---on-way resistance coefficient;
The spread speed that v---impact air-flow is downward along crack, m/s.
(3) evaluation work face Air return corner is to the windage of return air air regulator;
Face-airing system ventilation parameter is measured, and according to following formula evaluation work face Air return corner the tunnel windage to return air air regulator section;
Wherein: R
12---Air return corner is to the tunnel windage of return air air regulator section, kg/m
7;
P
2---the gas-static before return air air regulator, Pa;
V
1, v
2be respectively the wind speed before Air return corner, return air air regulator, m/s;
ρ
1, ρ
2be respectively the distinguished and admirable density before Air return corner, return air air regulator, kg/m
3;
Z
1, z
2be respectively the absolute altitude before Air return corner, return air air regulator, m;
Q---coal-face air quantity, m
3/ s;
(4) calculate between the safe regulatory region of pressure reduction of return air air regulator in coal-face positive draft system;
For ensureing being perfectly safe of coal-face back production, consider 40% rich coefficient, the pressure balance face in Air return corner and goaf, top is controlled to interval
the gas pressure that is Air return corner place meets:
Convolution (2) and formula (3) can draw, in goaf, top not when occurrence of large-area roof caving, in coal-face positive draft system, between the safe regulatory region of pressure reduction of return air air regulator, is:
Wherein: P
return air---the gas-static after return air air regulator, Pa;
Δ P---the gas-static after gas-static and return air air regulator before return air air regulator is poor.
As shown in Figure 2,4-coal-face air intake lane, 5-coal-face positive pressure system booster fan, 6-coal-face return air air regulator, 7-coal-face return airway, 8-coal-face Air return corner, before 9-work plane return air air regulator, after 10-work plane return air air regulator.
(5) install baroceptor and warning device;
As shown in Figure 3, before coal-face return air air regulator, installing the first baroceptor is 4# baroceptor, pressure reduction situation of change before and after 4# baroceptor monitoring return air air regulator.In coal-face air intake crossheading, install 3 the second baroceptors, be respectively 1#, 2#, 3# baroceptor, in coal-face air return way, install 4 the second baroceptors, be respectively 5#, 6#, 7#, 8# baroceptor, the air pressure sudden change situation in the second baroceptor monitoring goaf, top, it installs number can carry out corresponding increase and decrease as required, installs number more, and the monitoring reliability of goaf, top air pressure sudden change situation is stronger.The first baroceptor is all connected with data collecting instrument with the second baroceptor, and data collecting instrument is connected with automatic control unit, and automatic control unit is connected with return air air regulator, warning device respectively.In Fig. 3, respectively arrange a warning device 11 at air entering and returning crossheading near work plane place; Arrange automatic control unit B and two data collecting instrument A1, A2 at return air air regulator place, data collecting instrument A1 gathers the data of 1#, 2#, 3# baroceptor, and data collecting instrument A2 gathers the data of 4#, 5#, 6#, 7#, 8# baroceptor.
Regulate safely interval value according to the return air air regulator pressure reduction calculating in step (4), in automatic control unit, set air regulator automatic control program, work plane return air air regulator control system flow process as shown in Figure 4, the pressure data of data collecting instrument Real-time Collection baroceptor, and transferring data to automatic control unit, automatic control unit is directly connected with warning device with the control device of return air air regulator.In the time that large area roof caving does not appear in goaf, top, automatic control unit changes according to the pressure reduction before and after return air air regulator, regulates in real time return air air regulator, and the gas-static before making return air air regulator and after return air air regulator is poor all the time between safe regulatory region; In the time there is large area roof caving in goaf, top, baroceptor is experienced significantly pressure jump, automatic control unit control return air air regulator is closed, two same alarms of warning device, coal-face operating personnel withdraw from immediately, in the time that pressure jump value is reduced to normal value, regulate return air air regulator to normal condition.
Describe content of the present invention in detail and realize principle at the application example of Shaanxi coal industry Chemical Group grandson family trouble colliery, Longhua 30110 coal-faces by short range seam mining method of ventilation under the flame range based on positive draft system below:
(1) judge 30110 coal-faces and top 2
-2the connectedness in coal goaf
The about 2.5m of 30110 coal-face mining height, face roof lithology is taking siltstone and fine sandstone as main, and getting broken swollen coefficient is 1.15,3
-1coal is flat seam.According to caving zone, fissure zone design formulas, calculate 30110 coal-face caving zone height H
1=16.7m, fissure zone height H
2=41.1 ~ 58.9m, therefore fissure zone number range is 16.7 ~ 41.1m or 16.7 ~ 58.9m, 30110 work planes and top 2
-2coal goaf spacing is about 37.6m, illustrates that 30110 coal-faces and goaf, top possess connected relation, and the toxic and harmful of top flame range exists the possibility that pours in coal-face.
(2) determine the safe range of the distinguished and admirable pressure in Air return corner place
According to field measurement, determine that 30110 coal-face relevant parameters are as follows: goaf, work plane top gas pressure intensity p
0=877.8HPa; The local atmospheric density ρ=1.073kg/m of mine
3; Gravity acceleration g is got 9.85N/kg; Coal seam spacing h=37.6m; Top goaf top plate stratum density ρ
d=1.25kg/m
3; The long L of roof caving block
1, wide L
2with thick h
1be respectively 500m, 100m, 10m; Superjacent mining height M=2.5m, can be calculated the volume that is caving goaf, region is V
0=ML
1l
2=1.25 × 10
5m
3; According to journey resistance coefficient design formulas, calculate on-way resistance coefficient; Impact air-flow initial time speed v in addition
0, impact air-flow generation time t, t moment top board block distance of fall z and the impact air-flow spread speed v downward along crack adopts calculus to calculate and obtains.Can be calculated when 30110 goaf, the coal-face top occurrence of large-area roof caving according to formula (1), if will prevent, goaf, top pernicious gas from pouring in, and Air return corner place gas pressure should meet: P
corner>=896.09HPa.
At work plane, not when occurrence of large-area roof caving, if will guarantee, goaf, top pernicious gas can not pour in coal-face, ensures the distinguished and admirable goaf, top that can not enter of work plane, the gas pressure P of coal-face Air return corner place simultaneously
cornershould remain in security interval (881.77HPa, 885.75HPa).
(3) 30110 face-airing parameters are measured, the pressure, density, wind speed, the absolute altitude that obtain Air return corner place are P
corner=883.8HPa, ρ
1=1.062kg/m
3, v
1=0.76m/s, z
1=1094.3m; Pressure before return air air regulator, density, wind speed, absolute altitude are: P
2=883.7HPa, ρ
2=1.062kg/m
3, v
2=1.07m/s, z
2=1094m; Face air volume Q=13m
3/ s.Tried to achieve by (2): Air return corner is to the tunnel windage R of return air air regulator section
12=0.07587kg/m
7.
(4) determine between the safe regulatory region of pressure reduction of return air air regulator
At 30110 work plane air intake crossheading places, two booster fans being installed, is 30110 work plane superchargings, air feed, and a return air air regulator is installed at air return way place, and the gas pressure of 30110 work planes is regulated.Work plane field measurement can obtain air quantity Q=13m
3/ s, the density p at Air return corner place
1=1.062kg/m
3, wind speed v
1=0.761m/s, absolute altitude z
1=1094.3m; Density p before return air air regulator
2=1.062kg/m
3, wind speed v
2=1.07m/s, absolute altitude z
2=1094m; Gas pressure P after return air air regulator
return air=887.9HPa.
According to above-mentioned actual measurement parameter, consider 40% rich coefficient, the pressure balance face in Air return corner place and goaf, top should be controlled to interval
being calculated by formula (4), (5), while there is not large area roof caving, is (338Pa, 417Pa) between the safe regulatory region of pressure reduction of 30110 work plane return air air regulators in goaf, top.
(5) before 30110 work plane return air air regulators, install the gas differential pressure before and after 4# baroceptor Real-Time Monitoring work plane return air air regulator; Install 1#, 2#, 3# baroceptor at air intake crossheading, install 5#, 6#, 7#, 8# baroceptor at air return way, the air pressure change in monitoring goaf, top; Respectively arrange a warning device at air entering and returning crossheading near work plane place; Arrange control module B and two data collecting instrument A1, A2 at return air air regulator place, data collecting instrument A1 gathers the data of 1#, 2#, 3# baroceptor, and data collecting instrument A2 gathers the data of 4#, 5#, 6#, 7#, 8# baroceptor.The pressure data of data collecting instrument Real-time Collection baroceptor, and transfer data to control module, control module is directly connected with warning device with the control device of return air air regulator.In the time that large area roof caving does not appear in goaf, top, automatic control system, according to the air pressure change before return air air regulator, regulates return air air regulator pressure reduction at (338Pa, 417Pa) in real time; When arbitrary baroceptor of installing when goaf, top is experienced significantly pressure jump, automatic control system is closed return air air regulator, two same alarms of warning device, and coal-face operating personnel withdraw from immediately, in the time that pressure jump value is reduced to normal condition, regulate return air air regulator to normal condition.
Claims (1)
1. a short range seam mining method of ventilation under the flame range based on positive draft system, is characterised in that it comprises the following steps:
(1) judge coal-face and top flame range connectedness;
According to caving zone, fissure zone design formulas, calculate contiguous seams coal-face caving zone height H
1, fissure zone height H
2, and then show that contiguous seams coal-face fissure zone number range is H
1～H
2, measure contiguous seams coal-face and goaf, top spacing is H
3; As numerical value H
3be positioned at fissure zone number range H
1～H
2outside time, illustrate that coal-face and top flame range do not possess connected relation, the toxic and harmful of top flame range does not possess the channel condition that pours in coal-face; As numerical value H
3be positioned at fissure zone number range H
1～H
2within time, illustrate that coal-face and top flame range possess connected relation, there is the possibility that pours in coal-face in the toxic and harmful of top flame range;
(2) possess connected relation in the case of meeting coal-face and the top flame range described in (1), determine the safe range of coal-face Air return corner place gas pressure;
Air return corner is as the minimum region of coal-face pressure energy, if ensure, top flame range pernicious gas cannot pour in work plane, only need guarantee that pernicious gas cannot pour in work plane Air return corner, simultaneously also need to prevent that coal-face from having to leak out enters goaf, top by Air return corner, the development of aggravation top flame range; Comprehensive above situation, in goaf not when occurrence of large-area roof caving, the gas pressure P of coal-face Air return corner place
cornersecurity interval be (P
0+ ρ gh, P
0+ 2 ρ gh);
Wherein: P
0---the gas pressure in goaf, top, Pa;
The local atmospheric density of ρ---mine, kg/m
3;
G---acceleration of gravity, N/kg;
H---contiguous seams spacing, m;
(3) evaluation work face Air return corner is to the windage of return air air regulator;
Face-airing system ventilation parameter is measured, and according to following formula evaluation work face Air return corner the tunnel windage to return air air regulator section;
Wherein: R
12---Air return corner is to the tunnel windage of return air air regulator section, kg/m
7;
P
corner---work plane Air return corner place gas pressure, Pa;
P
2---the gas-static before return air air regulator, Pa;
V
1, v
2be respectively the wind speed before Air return corner, return air air regulator, m/s;
ρ
1, ρ
2be respectively the distinguished and admirable density before Air return corner, return air air regulator, kg/m
3;
Z
1, z
2be respectively the absolute altitude before Air return corner, return air air regulator, m;
Q---coal-face air quantity, m
3/ s;
(4) calculate between the safe regulatory region of pressure reduction of return air air regulator in coal-face positive draft system;
For ensureing being perfectly safe of coal-face back production, consider 40% rich coefficient, the pressure balance face in Air return corner and goaf, top is controlled to interval
the gas pressure that is Air return corner place need meet:
Convolution (1) and formula (2) can draw, in goaf, top not when occurrence of large-area roof caving, in coal-face positive draft system, before and after return air air regulator, between the safe regulatory region of pressure reduction, is:
Wherein: P
return air---the gas-static after return air air regulator, Pa;
Gas-static before Δ P---return air air regulator and after return air air regulator is poor;
(5) install baroceptor and warning device;
At coal-face return air air regulator, place installs the first baroceptor, the situation of change of pressure reduction before and after the first baroceptor monitoring return air air regulator; In coal-face air entering and returning crossheading, install the second baroceptor, the air pressure sudden change situation in the second baroceptor monitoring goaf, top; The first baroceptor is all connected with data acquisition unit with the second baroceptor, and data acquisition unit is connected with automatic control unit, and automatic control unit is connected with return air air regulator, warning device respectively;
Regulate safely interval value according to the return air air regulator pressure reduction calculating in step (4), in automatic control unit, set air regulator automatic control program, in the time there is not large area roof caving in goaf, top, automatic control unit is according to the variation of pressure difference before and after the first baroceptor institute survey time wind air regulator, regulate in real time return air air regulator, return air air regulator front and back pressure difference is positioned between safe regulatory region all the time; In addition, in control module, set alarming value, in the time there is large area roof caving in goaf, top, the second baroceptor monitors pressure jump value and exceedes predefined alarming value, warning device is reported to the police, and work plane operating personnel withdraw from, and return air air regulator is closed, in the time that pressure jump value is reduced to normal value, return air air regulator is adjusted to normal condition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210260375.2A CN102777201B (en) | 2012-07-26 | 2012-07-26 | Ventilation method for exploiting short distance coal bed in fire zone based on positive pressure ventilation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210260375.2A CN102777201B (en) | 2012-07-26 | 2012-07-26 | Ventilation method for exploiting short distance coal bed in fire zone based on positive pressure ventilation system |
Publications (2)
| Publication Number | Publication Date |
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| CN103306701B (en) * | 2013-04-28 | 2016-01-27 | 中国矿业大学(北京) | Large regions controls pressure balance for air control system automatically |
| CN104462654B (en) * | 2014-11-11 | 2017-06-13 | 中国矿业大学 | Shallow embedding hides seam mining earth's surface insertion fractured zones and the feature decision method that leaks out |
| CN104933230B (en) * | 2015-05-29 | 2017-03-29 | 煤科集团沈阳研究院有限公司 | Consider the mine goaf Temperature Field Simulation method that atmospheric pressure affects |
| CN106593507A (en) * | 2016-11-26 | 2017-04-26 | 辽宁工程技术大学 | Ventilation resistance testing method |
| CN107247127A (en) * | 2017-06-29 | 2017-10-13 | 煤科集团沈阳研究院有限公司 | Consider the spontaneous combustion in goaf model test platform and test method of atmospheric pressure |
| CN109252884B (en) * | 2018-09-13 | 2020-01-07 | 辽宁工程技术大学 | Gob-side entry retaining working face Y-shaped ventilation pressure regulating disaster prevention method |
| CN113266409A (en) * | 2021-05-26 | 2021-08-17 | 中煤科工集团沈阳研究院有限公司 | Low-oxygen prevention and control method for mine working face |
| CN114034445B (en) * | 2021-11-30 | 2023-10-17 | 国能神东煤炭集团有限责任公司 | Method and system for detecting air leakage channel |
| CN115853578B (en) * | 2023-02-28 | 2023-05-02 | 臣功环境科技有限公司 | Filling method for filling repeated mining and exploration of underground coal mine small kiln damage area |
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