CN102830038B - Apparatus and method for rapid determination of parameters of residual gas on mining working face of underground coal mine - Google Patents
Apparatus and method for rapid determination of parameters of residual gas on mining working face of underground coal mine Download PDFInfo
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Abstract
The invention relates to an apparatus and a method for rapid determination of parameters of residual gas on a mining working face of an underground coal mine. The determination apparatus is provided with a coal sample tank; a pneumatic motor is arranged at the lower part of the coal sample tank; a rotating shaft is mounted on the upper part of the pneumatic motor; a crushing cutter head is installed at a side surface of the rotating shaft; the upper part of the coal sample tank is communicated with one end of a gas-guide tube, and the other end of the gas-guide tube is connected with a high precision pressure gauge; a gas stop valve is arranged at a joint position of the gas-guide tube and the coal sample tank; the side surface of the gas-guide tube is communicated with an interface of a three-way angle valve through a connection flexible pipe, and the other two interfaces of the three-way angle valve are respectively communicated with the bottoms of burette I and burette II through connection pipes. The determination method comprises the following steps: determination of curves representing the relationship between different balance pressures during adsorption of methane by coal and desorption quantity and the relationship between the different balance pressures and methane content; determination of desorbable gas quantity on the working face and calculation of content, pressure and expansion energy of residual gas on the mining working face. The determination method for residual gas on the mining working face has the advantages of a short period of time, small workload and high reliability of determination results, provides multi-parameter determination indexes for prediction of prominent dangers and examination of outburst prevention effects and has significant meaning to development of outburst prevention technology on a working face.
Description
Technical field
The present invention relates to a kind of method measuring the remaining Gas explosion burns of underground coal mine getting working face, especially down-hole Fast Measurement getting working face can coal seams gas discharging quantity accurately drawn the device and method of the remaining Gas explosion burns of the underground coal mine Fast Measurement getting working face of workplace gas remainder quantity, remaining gas pressure and remaining gas flow patterns by analytical calculation.
Background technology
Along with the extension of the pit mining degree of depth, most mine gradually by gaseous mine to high methane even projecting mine change, gas has become one of principal element of restriction mining area development." control coal and gas prominent regulation " requirement, projecting mine should carry out region outburst hazard prediction according to coal-bed gas pressure or gas bearing capacity to projecting coal bed; And these confirm effective index and method to require should to adopt remaining gas pressure, gas remainder quantity during exploitation area of coal mining face with potential outburst danger, carry out outburst hazard prediction and validity check.Therefore, the key point that workplace gas remainder quantity and remaining gas pressure have become outburst danger prediction and validity check can be gone out by rapid and accurate determination.Now coal seam gas-bearing capacity assay method mainly contains direct method and indirect method two class at present.Direct Determination first will down-hole carry out coal sample pulverize before the on-site measurement of natural coal seams gas discharging quantity, the natural coal seams gas discharging quantity after then sending laboratory to pulverize coal sample and the mensuration of residual gas amount; Indirect Determination needs in down-hole actual measurement coal output layer gas pressure, and requires the mensuration of carrying out absorption constant (a, b value), porosity and industrialness analytical parameters in laboratory.It is large that above-mentioned two kinds of methods measure workload, needs the time long, measurement result poor reliability; Particularly at getting working face because the restriction of tested press seal hole condition cannot the remaining gas pressure of Accurate Determining coal output layer.
Summary of the invention
Cannot the problem of the remaining gas pressure of Accurate Determining coal output layer in order to solve existing assay method, the invention provides the device and method of the remaining Gas explosion burns of a kind of underground coal mine Fast Measurement getting working face, the method is tested by the isothermal desorption of coal in laboratory, tries to achieve the different equalized pressure equalized pressure different from coal adsorbed methane desorption quantity Fitting curve equation of coal adsorbed methane and methane-content plot fit equation in advance; When the prediction of getting working face outburst hazard or verifying outburst prevention effect, utilizing down-hole rapid determination device to determine getting working face can coal seams gas discharging quantity, more accurately calculates workplace and measure the gas remainder quantity in place, remaining gas pressure and remaining watt phase expansion energy three Gas explosion burns; The time of the method mensuration required for Gas explosion burns is short, workload is little, influence factor is few, measurement result reliability is high, and be applicable to same coal seam getting working face multiple spot Fast Measurement, for the prediction of workplace outburst hazard and verifying outburst prevention effect provide multiparameter Judging index, there is higher reliability and security, significant to the development of workplace protrusion-dispelling technology.
The technical solution adopted for the present invention to solve the technical problems is: try to achieve the different equalized pressure equalized pressure different from coal adsorbed methane desorption quantity Fitting curve equation of coal adsorbed methane and methane-content plot fit equation in advance in laboratory; Recycling down-hole rapid determination device determines getting working face can coal seams gas discharging quantity, solves the remaining Gas explosion burns of workplace finally by accurately calculating.
Down-hole rapid determination device is provided with the coal sample tank of a tubular, the outside of coal sample tank is provided with the housing shielded, the bottom of coal sample tank is fixed with air motor, the top Matching installation of air motor has turning axle, the side of turning axle evenly misplaces from top to bottom and is provided with pulverizing cutter head, the top of coal sample tank is communicated with one end of wireway, the other end of wireway is connected to high-precision pressure gauge, the interface of wireway and coal sample tank is provided with gas stop valve, the side of wireway is connected with an interface of threeway angle valve by connecting hose, two other interface of threeway angle valve is connected with the bottom of buret I with buret II respectively by connecting pipe, in addition, the bottom of buret I and buret II is communicated with tank by connecting pipe simultaneously, the upper side of buret I and buret II is provided with drain tap.
(1) under the different equalized pressure of coal adsorbed methane, desorption quantity and methane-content plot measure
Get the fresh coal sample of workplace in down-hole and send laboratory, first measure the pseudodensity of producing coal, then the coal sample of some is pulverized, take granularity 0.25mm ~ 0.18mm coal sample 42g ~ 45g and to coaling sample tank, adopt high pressure content method to carry out the isothermal desorption experiment of coal.Require during experiment that coal sample tank fills high pressure methane and is placed on more than 6h in 30 DEG C of water baths and, after coal sample adsorbed methane balance, then opens coal sample tank valve every 4h, release a part of methane and enter buret I and buret II.First read coal sample tank pressure of methane before each venting, then record the rear buret I of venting and buret II salt discharge water volume, record environment atmospheric pressure and temperature simultaneously.Then can solve the different equalized pressure equalized pressure different from coal adsorbed methane desorption quantity Fitting curve equation of the adsorbed methane that produces coal and methane-content plot fit equation according to the data of above-mentioned record, concrete data handling procedure is with reference to MT/T752-1997.
The Fitting curve equation that above-mentioned laboratory is tried to achieve, can repeat to utilize when the prediction of workplace outburst hazard and validity check, have good convenience.
(2) workplace can measure by coal seams gas discharging quantity
During mensuration, first drill through the coal sample that workplace measures place, start timing at borehole drilling to during predetermined depth, the fresh coal sample collected is loaded rapidly in coal sample tank and seals; By connecting hose, coal sample tank is connected with buret II with buret I, opens gas stop valve, then recorded the water discharge of buret I and buret II every one minute, require record more than 30 minutes.When water discharge change is not obvious, then be placed on the draw-in groove of air motor by coal sample tank, the air valve opening air motor utilizes pulverizing cutter head to pulverize coal sample in coal sample tank; When the water discharge of buret I and buret II is without significant change, record water discharge reading, then carries out coal sample to weigh and mensuration work can terminate after recording weight.Then can calculate getting working face by time of above-mentioned record, water discharge data and coal sample weight can coal seams gas discharging quantity.
(3) getting working face gas remainder quantity, pressure and expansion energy size calculate
Getting working face gas remainder quantity calculates: utilizing the pressure that solves and desorption quantity Fitting curve equation to extrapolate workplace normal pressure can not coal seams gas discharging quantity; The workplace recorded can not be added by coal seams gas discharging quantity with normal pressure by coal seams gas discharging quantity, then can try to achieve getting working face gas remainder quantity.
The remaining gas pressure of workplace calculates: getting working face gas remainder quantity is substituted into the pressure and methane-content plot fit equation that solve, can try to achieve the remaining gas pressure size of workplace by inverse.
The remaining gas flow patterns of workplace calculates: according to aforementioned obtain can coal seams gas discharging quantity and gas pressure, carry out analytical calculation by expansion energy computing formula, then can try to achieve expansion energy size.
In formula: w-gas flow patterns, J/kg;
P
0-subsurface environment atmospheric pressure, is read by coal sample tank upward pressure table, Mpa;
V-can coal seams gas discharging quantity, m
3/ kg;
N-gas adiabatic exponent, gets 1.31;
P-gas pressure, Mpa.
The invention has the beneficial effects as follows, the method mensuration workplace remaining time required for Gas explosion burns is short, workload is little, influence factor is few, measurement result reliability is high, and be applicable to same coal seam getting working face multiple spot Fast Measurement, for the prediction of workplace outburst hazard and verifying outburst prevention effect provide multiparameter Judging index, there is higher reliability and security, significant to the development of workplace protrusion-dispelling technology.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1 is the structural principle schematic diagram of device of the present invention.
Fig. 2 is the principle flow chart of assay method of the present invention.
Fig. 3 is desorption quantity and the methane content computation process of coal under different equalized pressure.
Fig. 4 is the desorption quantity graph of relation of equalized pressure and coal.
Fig. 5 is the methane content graph of relation of equalized pressure and coal.
Fig. 6 is the remaining firedamp testing result signal of the different gaging hole degree of depth of crossheading on 11071.
In figure, 1. buret I, 2. buret II, 3. drain tap, 4. tank, 5. threeway angle valve, 6. high-precision pressure gauge, 7. gas stop valve, 8. coal sample tank, 9. pulverize cutter head, 10. housing, 11. air motors, 12. connecting hoses.
Embodiment
In the drawings, this determinator is provided with the coal sample tank 8 of a tubular, the outside of coal sample tank 8 is provided with the housing 10 shielded, the bottom of coal sample tank 8 is fixed with air motor 11, the top Matching installation of air motor 11 has turning axle, the side of turning axle evenly misplaces to be provided with from top to bottom and pulverizes cutter head 9, the top of coal sample tank 8 is communicated with one end of wireway, the other end of wireway is connected to high-precision pressure gauge 6, the interface of wireway and coal sample tank 8 is provided with gas stop valve 7, the side of wireway is connected with an interface of threeway angle valve 5 by connecting hose 12, two other interface of threeway angle valve 5 is connected with the bottom of buret I 1 with buret II 2 respectively by connecting pipe, in addition, the bottom of buret I 1 and buret II 2 is communicated with tank 4 by connecting pipe simultaneously, the upper side of buret I 1 and buret II 2 is provided with drain tap 3.
The step that this assay method measures the remaining Gas explosion burns of getting working face mainly to comprise under the different equalized pressure of coal adsorbed methane desorption quantity and methane-content plot measures, workplace can to measure and getting working face gas remainder quantity, pressure and expansion energy size calculate by coal seams gas discharging quantity.
(1) under the different equalized pressure of coal adsorbed methane, desorption quantity and methane-content plot measure
Get the fresh coal sample of workplace in down-hole and send laboratory, first measure the pseudodensity of producing coal, then the coal sample of some is pulverized, take granularity 0.25mm ~ 0.18mm coal sample 42g ~ 45g and to coaling sample tank, adopt high pressure content method to carry out the isothermal desorption experiment of coal.Require during experiment that coal sample tank fills high pressure methane and is placed on more than 6h in 30 DEG C of water baths and, after coal sample adsorbed methane balance, then opens coal sample tank valve every 4h, release a part of methane and enter buret I and buret II.First read coal sample tank pressure of methane before each venting, then record the rear buret I of venting and buret II salt discharge water volume, record environment atmospheric pressure and temperature simultaneously.Then can solve the different equalized pressure equalized pressure different from coal adsorbed methane desorption quantity Fitting curve equation of the adsorbed methane that produces coal and methane-content plot fit equation according to the data of above-mentioned record, concrete data handling procedure is with reference to MT/T752-1997.
The Fitting curve equation that above-mentioned laboratory is tried to achieve, can repeat to utilize when the prediction of workplace outburst hazard and validity check, have good convenience.
(2) workplace can measure by coal seams gas discharging quantity
During mensuration, first drill through the coal sample that workplace measures place, start timing at borehole drilling to during predetermined depth, the fresh coal sample collected is loaded rapidly in coal sample tank 8 and seal; By connecting hose 12, coal sample tank 8 is connected with buret II 2 with buret I 1, opens gas stop valve 7, then recorded the water discharge of buret I 1 and buret II 2 every one minute, require record more than 30 minutes.When water discharge change is not obvious, then be placed on by coal sample tank 8 on the draw-in groove of air motor 11, the air valve opening air motor 11 utilizes coal sample in pulverizing cutter head 9 pairs of coal sample tanks 8 to pulverize; When the water discharge of buret I 1 and buret II 2 is without significant change, record water discharge reading, then carries out coal sample to weigh and mensuration work can terminate after recording weight.Then can calculate getting working face by time of above-mentioned record, water discharge data and coal sample weight can coal seams gas discharging quantity.
(3) getting working face gas remainder quantity, pressure and expansion energy size calculate
Getting working face gas remainder quantity calculates: utilizing the pressure that solves and desorption quantity Fitting curve equation to extrapolate workplace normal pressure can not coal seams gas discharging quantity; The workplace recorded can not be added by coal seams gas discharging quantity with normal pressure by coal seams gas discharging quantity, then can try to achieve getting working face gas remainder quantity.
The remaining gas pressure of workplace calculates: getting working face gas remainder quantity is substituted into the pressure and methane-content plot fit equation that solve, can try to achieve the remaining gas pressure size of workplace by inverse.
The remaining gas flow patterns of workplace calculates: according to aforementioned obtain can coal seams gas discharging quantity and gas pressure, carry out analytical calculation by expansion energy computing formula, then can try to achieve expansion energy size.
In formula: w-gas flow patterns, J/kg;
P
0-subsurface environment atmospheric pressure, is read by coal sample tank upward pressure table, Mpa;
V-can coal seams gas discharging quantity, m
3/ kg;
N-gas adiabatic exponent, gets 1.31;
P-gas pressure, Mpa.
The specific embodiment of this invention is:
Colliery, prosperous imperial Coal Industry Group Longshan, Anyang is positioned at hydrometallurgy town, Anyang in Henan province county, designed [underground 500,000 t/a, and master adopts No.II1 coal seam.No.II1 coal seam is composed and is stored in group bottom, Shanxi, composes and deposits absolute altitude+130.00 ~-510.00m, buried depth 30.00 ~ 680.00m, thickness of coal seam 0.08 ~ 10.63m, average thick 5.21m.Longshan Mine is coal and gas outburst mine, coal and gas prominent has once occurred 111 times since self-built ore deposit, maximumly once outstandingly occurs in when cutting eye driving in 6 days 13081 April in 1999, and intensity of outburst is 1070t, ejection gas amount 167435m
3.
Longshan Mine starts crossheading on to 11071 in October, 2011 and carries out gob-side entry driving, for preventing the generation of outstanding accident, China Mining University is studied crossheading gob-side entry driving outburst hazard on 11071 by the remaining Gas explosion burns rapid assay methods of application workplace.
Isothermal desorption experiment in crossheading coal sample laboratory on 1.11071
On 11071, crossheading is got fresh coal sample and is sent laboratory, and the pseudodensity that Application density instrument records coal is 1.45g/cm
3; Then adopt high pressure content method to carry out the isothermal desorption experiment of coal at 30 DEG C, experiment records the different discharge quantity data corresponding to equalized pressure of coal adsorbed methane as shown in Figure 3.
Because discharge quantity corresponding under different equalized pressure comprises coal sample tank dead space discharge quantity, the desorb discharge quantity of coal and free methane discharge quantity three part of coal.Therefore, solve the desorb of coal, coal sample tank dead space discharge quantity should be deducted when comprising the free methane discharge quantity of coal.Coal sample tank dead-volume size adopts following formulae discovery:
V
s＝Vg-Vm
V
m＝G/ARD
V in formula
s-coal sample tank dead space, cm
3;
Vg-coal sample tank volume, cm
3;
Vm-coal sample volume, cm
3;
G-coal sample weight, g;
ARD-coal sample pseudodensity, g/cm
3.
In addition, should be taken into account the compressibility coefficient of methane and the impact of experimental situation pressure and temperature when calculating the desorb discharge quantity of coal.
Matching is carried out to the desorption quantity data of unit mass coal corresponding under equalized pressure different in Fig. 3, the desorption quantity relation curve fit equation of equalized pressure and coal can be tried to achieve, as shown in Figure 4.
Utilize the different equalized pressure of the coal adsorbed methane solved and desorption quantity relation curve fit equation:
Q
j＝1.2528P
2+2.2888P+2.231
Q in formula
jthe desorption quantity of coal under-different equalized pressure, ml/g;
P-coal absorption methane equalized pressure, MPa.
If imagination is when equalized pressure is decreased to 0MPa from normal pressure 0.101325MPa, then can extrapolate normal pressure according to above formula can not coal seams gas discharging quantity be 2.476ml/g, therefore, the methane content of unit mass coal corresponding under can trying to achieve different equalized pressure further and fit correlation curvilinear equation, as depicted in figs. 3 and 5.
On 2.11071, crossheading remnants can measure by coal seams gas discharging quantity
On 11071, under crossheading, lane side arranges 5 gaging holes, and application fire damp desorb determinator can measure by coal seams gas discharging quantity the remnants of 5 gaging hole different depths, and measurement result as shown in Figure 6.
On 3.11071, crossheading gas remainder quantity, pressure and expansion energy calculate
Be 2.476ml/g according to crossheading normal pressure intangibility pipette on 11071, by can being added with normal pressure intangibility pipette by coal seams gas discharging quantity of recording, the gas remainder quantity of each gaging hole different depth of crossheading on 11071 can be tried to achieve, as shown in Figure 6.
Utilize the methane content relation curve fit equation of equalized pressure and coal:
Q
h＝-0.6119P
2+10.266P+3.8324
Q in formula
hthe methane content of coal under-different equalized pressure, ml/g;
P-coal absorption methane equalized pressure, MPa.
The remaining gas pressure of each gaging hole of crossheading on 11071 different depth can be gone out by inverse, as shown in Figure 6.
Utilize gas flow patterns computing formula:
In formula: w-gas flow patterns, J/kg;
P
0-subsurface environment atmospheric pressure, is read by coal sample tank upward pressure table, Mpa;
V-can coal seams gas discharging quantity, m
3/ kg;
N-gas adiabatic exponent, gets 1.31;
P-gas pressure, Mpa.
The remaining gas flow patterns of crossheading each gaging hole different depth on 11071 can be tried to achieve.
As shown in Figure 6, on 11071 depth capacity 22m place of side, crossheading distance lane, and maximum gas remainder quantity is 6.31ml/g, is less than 8ml/g; Maximum remaining gas relative pressure is 0.12, is less than 0.74MPa; Maximum remaining gas flow patterns is 252.16KJ/Kg.Therefore, can to think on 11071 that crossheading is in contiguous workplace and adopt within the scope of release drainage, gob-side entry driving is without outburst hazard.
Claims (1)
1. the method for the remaining Gas explosion burns of underground coal mine Fast Measurement getting working face, it is characterized in that: try to achieve the different equalized pressure equalized pressure different from coal adsorbed methane desorption quantity Fitting curve equation of coal adsorbed methane and methane-content plot fit equation in advance in laboratory, its concrete enforcement means are: get the fresh coal sample of workplace in down-hole and send laboratory, first the pseudodensity of producing coal is measured, then the coal sample of some is pulverized, take granularity 0.25mm ~ 0.18mm coal sample 42g ~ 45g to coaling sample tank, high pressure content method is adopted to carry out the isothermal desorption experiment of coal, require during experiment that coal sample tank fills high pressure methane and to be placed in 30 DEG C of water baths more than 6h after coal sample adsorbed methane balance, then coal sample tank valve is slowly opened every 4h, release a part of methane and enter buret I (1) and buret II (2), coal sample tank pressure of methane is first read before each venting, buret I (1) and buret II (2) salt discharge water volume after record venting again, record environment atmospheric pressure and temperature simultaneously, the different equalized pressure equalized pressure different from coal adsorbed methane desorption quantity Fitting curve equation of the adsorbed methane that produces coal and methane-content plot fit equation then can be solved according to the data of above-mentioned record, concrete data handling procedure is with reference to MT/T752-1997, recycling down-hole rapid determination device determines getting working face can coal seams gas discharging quantity, its concrete enforcement means are: first drill through the coal sample that workplace measures place, timing is started to during predetermined depth at borehole drilling, the fresh coal sample collected is loaded rapidly sealing in coal sample tank (8), by connecting hose (12), coal sample tank (8) is connected with buret II (2) with buret I (1), open gas stop valve (7), then the water discharge of buret I (1) and buret II (2) was recorded every one minute, require record more than 30 minutes, when water discharge change is not obvious, again coal sample tank (8) is placed on the draw-in groove of air motor (11), the air valve opening air motor (11) utilizes pulverizing cutter head (9) to pulverize coal sample in coal sample tank (8), when the water discharge of buret I (1) and buret II (2) is without significant change, record water discharge reading, then coal sample is carried out weighing and mensuration work can terminate after recording weight, by the time of above-mentioned record, water discharge data and coal sample weight then can calculate getting working face can coal seams gas discharging quantity, the remaining Gas explosion burns of workplace is solved finally by accurately calculating, its concrete enforcement means are: utilizing the different equalized pressure of the coal adsorbed methane that solves and desorption quantity Fitting curve equation to extrapolate workplace normal pressure can not coal seams gas discharging quantity, the workplace recorded can not be added by coal seams gas discharging quantity with normal pressure by coal seams gas discharging quantity, then can try to achieve getting working face gas remainder quantity, getting working face gas remainder quantity is substituted into the different equalized pressure of coal adsorbed methane and methane-content plot fit equation, the remaining gas pressure of workplace can be tried to achieve by inverse, according to aforementioned obtain can the remaining gas pressure of coal seams gas discharging quantity and workplace, analytical calculation is carried out by expansion energy computing formula, then can try to achieve the remaining gas flow patterns size of workplace,
In formula: w-gas flow patterns, J/kg;
P
0-subsurface environment atmospheric pressure, is read by coal sample tank upward pressure table, Mpa;
V-can coal seams gas discharging quantity, m
3/ kg;
N-gas adiabatic exponent, gets 1.31;
P-gas pressure, Mpa;
This determinator is provided with the coal sample tank (8) of a tubular, the outside of coal sample tank (8) is provided with the housing (10) shielded, the bottom of coal sample tank (8) is fixed with air motor (11), the top Matching installation of air motor (11) has turning axle, the side of turning axle evenly misplaces to be provided with from top to bottom and pulverizes cutter head (9), the top of coal sample tank (8) is communicated with one end of wireway, the other end of wireway is connected to high-precision pressure gauge (6), the interface of wireway and coal sample tank (8) is provided with gas stop valve (7), the side of wireway is connected with an interface of threeway angle valve (5) by connecting hose (12), two other interface of threeway angle valve (5) is connected with the bottom of buret I (1) with buret II (2) respectively by connecting pipe, in addition, the bottom of buret I (1) and buret II (2) is communicated with tank (4) by connecting pipe simultaneously, the upper side of buret I (1) and buret II (2) is provided with drain tap (3),
The step that described method measures the remaining Gas explosion burns of getting working face mainly to comprise under the different equalized pressure of coal adsorbed methane desorption quantity and methane-content plot measures, workplace can to measure and getting working face gas remainder quantity, pressure and expansion energy size calculate by coal seams gas discharging quantity.
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