CN101135621B - Direct rapid measuring method capable of desorbing mash gas content with coal seam - Google Patents
Direct rapid measuring method capable of desorbing mash gas content with coal seam Download PDFInfo
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- CN101135621B CN101135621B CN200610095077A CN200610095077A CN101135621B CN 101135621 B CN101135621 B CN 101135621B CN 200610095077 A CN200610095077 A CN 200610095077A CN 200610095077 A CN200610095077 A CN 200610095077A CN 101135621 B CN101135621 B CN 101135621B
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- 239000003245 coal Substances 0.000 title claims abstract description 241
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000003795 desorption Methods 0.000 claims abstract description 76
- 238000005070 sampling Methods 0.000 claims abstract description 11
- 238000005065 mining Methods 0.000 claims abstract description 9
- 238000004364 calculation method Methods 0.000 claims abstract description 5
- 238000010298 pulverizing process Methods 0.000 claims description 35
- 238000005259 measurement Methods 0.000 claims description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 238000005553 drilling Methods 0.000 claims description 20
- 238000012360 testing method Methods 0.000 claims description 19
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 11
- 238000007599 discharging Methods 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 238000010276 construction Methods 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 7
- 238000004458 analytical method Methods 0.000 claims description 4
- 239000008187 granular material Substances 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 241001074085 Scophthalmus aquosus Species 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 239000000498 cooling water Substances 0.000 claims description 2
- 238000012937 correction Methods 0.000 claims description 2
- 230000000994 depressogenic effect Effects 0.000 claims description 2
- 238000013461 design Methods 0.000 claims description 2
- 239000002893 slag Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 description 10
- 239000011229 interlayer Substances 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000003556 assay Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 238000012545 processing Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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Abstract
The method comprises: sampling coal core from underground mining; at underground mining, measuring and calculating the gas loss quantity of coal core; at the ground, measuring and calculating the desorption of the coal mining gas; measuring and calculation the grind gas desorption of partial coal core; calculating the content of gas capable of being desorbed.
Description
Technical field
But the present invention relates to the direct and quick determination method of coal seam desorbing mash gas content.
Background technology
Coal-bed gas is to cause that coal and gas are outstanding, gas is gushed out unusually and the leading factor of great gas disaster such as gas explosion, it is the prerequisite that control gas is outstanding and administer gas that the regularity of distribution is deposited in the tax that coal-bed gas is held in accurate support, so the rapid and accurate determination of coal seam gas-bearing capacity is most important.
Usually, the assay method of the original gas bearing capacity in coal seam mainly contains two kinds, i.e. indirect method and direct method.Both at home and abroad the most frequently used coal seam gas-bearing capacity indirect determination method is according to the original gas pressure in field measurement coal seam, and the absorption constant of experimental determination coal and carry out technical analysis etc. calculates coal seam gas-bearing capacity with general formula.Measurement of Seam Gas Content by Indirect Method also is the method that generally adopts at present, but measuring, indirect method needs the original gas pressure in actual measurement coal seam under coal mine, it is complicated that the original gas pressure in coal seam is measured technology, the selection of measuring point is arranged, hole-sealing technology, the processing of each link of leaking gas etc. all has strict technical requirement, whichever link is handled all can cause pressure measurement result inefficacy or unreliable accidentally, for example measuring the original gas pressure measuring point in coal seam selects to avoid the tectonic structure band, digging tunnel influence band etc., can not arrange a large amount of or measure at concrete coal seam, can not compose the situation of depositing by the whole coal-bed gas of accurately grasping of large tracts of land than multi-measuring point; Secondly, need certain tunnel, boring and sealing of hole engineering when indirect method is measured, need special sealing material and special-purpose sealing of hole equipment etc., it is bigger to measure quantities, also need carry out a large amount of laboratory works simultaneously and measure the absorption constant of coal and carry out technical analysis etc., cost of determination is higher; Once more, it is longer that indirect method is measured the cycle, is generally about 20～45 days, may affect to producing, and is unfavorable for rig-site utilization.In addition, indirect method on-site measurement complex process and also have a large amount of laboratory works, most collieries do not possess the technician and the equipment of this aspect, can only measure by the scientific research institutions of specialty, arrange impossible a lot so the rule measuring point is deposited in the tax of grasp mine gas, can adapt to current mining depth far from and strengthen the situation that gas emission is unusual.
The coal seam gas-bearing capacity assay method of exploring other is being studied always by some countries in recent years, how tame R﹠D institutions such as Chongqing Branch, Coal Science Research General Inst as China have studied multiple compensation model and applicable elements thereof respectively, the main surface drilling that adopts during the geologic prospecting is got the coal core or is directly got coal dust in the down-hole and measure coal seam gas-bearing capacity, but, in the Coal Production process, be not widely used because of its make-up time and compensation model existing problems cause its measured value less than normal.
Usually, but gas bearing capacity comprises that normal pressure desorbing mash gas content and normal pressure can not desorbing mash gas contents (being normal pressure absorption remaining quantity), and no matter former study is that the coal seam gas-bearing capacity that indirect method or direct method are measured all is above two parts content sums.Usually, coal mining enterprise measures coal seam gas-bearing capacity and is mainly used in outburst hazard evaluation and Mine Gas Emission Prediction etc., and but coal seam normal pressure desorbing mash gas content just really reacts the outburst hazard in coal seam, but the coal seam desorbing mash gas content just really determines the size of mine coal seam gas emission, normal pressure can not desorbing mash gas content the outstanding or gas basic not influence of gushing out to gas, because the different normal pressures of ature of coal can not have very big-difference by desorbing mash gas content, sometimes adopt normal pressure the desorbing mash gas content prediction can play opposite effect on the contrary, cause predicting the erroneous judgement than mistake or prediction outburst danger of gas emission, so but measure the coal seam desorbing mash gas content to predicting outburst hazard and predicting that gas emission is more meaningful.
Summary of the invention
But the direct and quick determination method that the purpose of this invention is to provide a kind of coal seam desorbing mash gas content, but the coal seam desorbing mash gas content can directly be measured and calculate to this method apace, for mine gas improvement provides foundation accurately, can be used for coal seam outburst hazard workplace and regional prediction, pre-gas pumping effect assessment and mine coal seam Forecast of Gas Emission etc.
The nature of coal seam desorbing mash gas content that the coal that " but coal seam desorbing mash gas content " of indication of the present invention is meant unit mass is directly measured and calculated under 20 ℃ and atmospheric pressure, do not comprise that normal pressure can not desorbing mash gas content (promptly not comprising " normal pressure absorption remaining quantity "), unit is m
3/ t, it expresses benchmark is former coal-based.
But desorbing mash gas content (Q
m) value equal " gas loss amount " (Q
1), " coal core desorption of mash gas amount " (Q
2), " pulverize desorption of mash gas amount " (Q
3) three's sum.
" gas loss amount " (Q
1) the coal core that is meant unit mass begins to break away from coal body in be loaded into before the coal sample tube during this period of time from the original position, the gas amount of the sucking-off of separating in boring and tunnel.By boring the coal core is taken out from coal seam depth, in time put into the coal sample tube and seal, then, the desorption of mash gas speed of coal core and desorption of mash gas amount in underground survey coal sample tube, and calculate pack into gas loss amount before the coal sample tube sealing of coal core with this.
" coal core desorption of mash gas amount " (Q
2) be meant that the coal core begins before pulverized the gas amount of the sucking-off of separating from the coal sample tube of packing into.Take the coal sample tube to the ground experiment chamber, then, the coal core of measuring from the coal sample tube discharges gas amount, calculates the core desorption of mash gas amount of producing coal with the desorption of mash gas amount that the down-hole records.
" pulverizing desorption of mash gas amount " (Q
3) be meant that under an atmospheric pressure coal core is in crushing process and pulverize the gas amount of the sucking-off of separating in a period of time of back.With the part coal core in the coal sample tube pack into the sealing reducing mechanism in pulverized, measurement is in crushing process and pulverize the sucking-off gas amount of separating (the pulverizing time is decided by coal core hardness) in back a period of time (about 15min), and calculates the desorption of mash gas amount of full coal core after pulverizing as benchmark.
But the direct and quick determination method of coal seam of the present invention desorbing mash gas content, its step is as follows:
(1) down-hole coal core sampling;
Seek out that coal sample has certain integrality, guaranteeing the quality property one is promptly taken out coal sample and kept original coal seam character, under the prerequisite that guarantees certain sampling success ratio, take out the coal sample at predetermined depth place in short as far as possible time.
A, boring layout,
But according to measuring the desorbing mash gas content actual conditions, select lane group's drill hole sampling or meet head on to move towards drill hole sampling or take a sample at base plate tunnel district layer-through drilling at mining face under mine;
B, boring,
According to the dip angle of hole that designs (generally being designed to the elevation angle), orientation, the degree of depth and aperture,, drain after having bored as far as possible and withdraw from drilling tool in the hole behind the residual powder fast with drilling machine construction boring;
C, get the coal core,
At the bottom of delivering to the hole fast with corer on the drilling rod band, when sending corer, open and press wind, put into residual powder in the corer process in case send to maximum;
After corer is delivered at the bottom of the hole, adjust drilling parameter, carry out sample drilling, write down the trip-out time simultaneously; Drilling process is optional with hydraulic slag discharging technology or wind power ganged deslagging technology according to coal seam conditions, creep into fill to corer till, record creeps into the concluding time; Withdraw from corer fast, getting coal sample is carried out suitable sorting, put into the coal sample tube, record coal sample tube sealing time, sampling end-of-job.
(2) and down measure and calculate coal core gas loss amount;
The atmospheric pressure of testing location and temperature under a, the measuring well are with aneroid pressure meter and thermometer test and record downhole testing place atmospheric pressure P
1And temperature T
1
B, measurement effusion gas amount, connect coal sample tube and desorption of mash gas measuring device, record reading and time when opening coal sample tube air valve, start stopwatch at once after running through first number, per minute writes down the desorb methane gas volume of once overflowing, Deng long enough time measurement effusion gas amount, be generally 45～60min or coal seams gas discharging quantity and finish when very little, turn off the air valve of coal sample tube;
C, calculating gas loss amount Q
1,
Coal sample is in initial one period exposure duration, and there are following relational model in accumulative total coal seams gas discharging quantity and coal sample desorption of mash gas time:
V＝k(t
0+t)
α (I)
V in the formula---coal sample is from exposing beginning up to t
0Total desorption of mash gas amount during+t, mL
t
0---the exposure duration before the coal sample desorb is measured, min;
t
1---get core and begin to finish to move back the time of brill, min to taking a sample
t
2---move back and bore beginning to beginning the time that desorb is measured, min
T---desorb minute, min
K---proportionality constant
α---desorb characteristic parameter according to the integrality value of getting the core coal sample, is between 0.25＜α＜0.5, and the good value of integrality is big
Obviously, desorption of mash gas loss amount V
1For:
V
1＝kt
0 α (II)
The desorption of mash gas amount V of test determination then
2For:
V
2＝V-V
1＝k(t
0+t)
α-V
1 (III)
Explanation about above-mentioned relation model parameter value: thinking that coal sample cuts down from coal body has promptly begun desorption process, so the exposure duration t before the coal sample desorb is measured
0Calculating the time get core and begin to finish to move back the time t of brill to sampling
1Be calculated as half (because of creeping into the not desorb that does not cut down), move back and bore beginning to beginning the time t that desorb is measured
2Should all count desorption time, to survey period detecting method timing rule different with common ground for these, ground survey the period detecting method think get core begin to sampling finish not-time, move back and bore beginning to beginning the time t that desorb is measured
2Be calculated as half; The value of desorb PARAMETER ALPHA is decided according to the integrality of getting the core coal sample, 0.25＜α＜0.5, and the good value of integrality is big, and also to survey period detecting method value rule different with common ground for these, and ground is surveyed period detecting method α value and is fixed as 0.5.
Can obtain desorption of mash gas loss amount V according to above-mentioned relation model and measured data match
1, V
1After standard state, can obtain Q through temperature, pressure correction
1
V in the formula
10---be scaled desorption of mash gas loss volume under the standard state, mL
P
1---downhole testing place atmospheric pressure, kPa
P
0---normal atmospheric pressure, kPa
T
1---the place temperature is measured in the down-hole, ℃
Q
1---gas loss amount, mL/g or m
3/ t
G---collection analysis coal sample weight
(3) coal core desorption of mash gas amount is measured and is calculated on ground;
A, recording laboratory environment temperature T
2, atmospheric pressure P
2,
B, measurement desorption of mash gas amount, debugging is breadboard desorption of mash gas measuring device well, and is connected with the coal sample tube, slowly opens coal sample tube air valve, reads the desorption quantity of a gas at interval every certain 2～10min; The length in the time interval depends on desorption rate.And the Changing Pattern of attention observation desorb cumulative amount, note abnormalities and in time handle.When actual measurement desorb gas volume reaches single measuring tube maximum range 85%, open switch and measure with second measuring tube.Minute generally is no less than 1h, or desorption of mash gas speed when very little till.
C, measurement are weighed after finishing, the gas amount V that record discharges
22, carefully take out coal sample, and remove the G that weighs behind the impurity such as tangible external spoil;
D, calculating coal core desorption of mash gas amount Q
2, coal core desorption of mash gas amount Q
2Form by two parts, i.e. the desorption quantity V of down-hole mensuration
21With experimental determination desorption quantity V
22, its computing method are undertaken by (VI), (VII) formula:
V in the formula
20---be scaled actual measurement desorb gas volume under the standard state, mL
V
21---the desorb gas volume that the down-hole is measured, mL
V
22---experimental determination desorb gas volume, mL
P
2---laboratory atmospheric pressure, kPa
T
2---the laboratory environment temperature, ℃
Q
2---coal core desorption of mash gas amount, mL/g or m
3/ t
G---remove the coal sample quality G behind the impurity such as tangible external spoil, g
(4) mensuration and calculating section coal core are pulverized desorption of mash gas amount Q
3
A, get coal sample, get two parts of secondary coal samples that quality is close from the coal core, secondary coal sample fair is 15 to restrain 300 grams, selects whole core or relatively large coal sample, guarantee the secondary coal sample and full coal sample identical characteristic is arranged;
B, coal sample are weighed and are smashed, and take by weighing the quality G of every part of secondary coal sample
21, G
22, pound to than granule (maximum particle size is no more than 10mm) with iron hammer then, the secondary coal sample is put into the pulverizing bucket, build and pulverize bung and seal tight;
The desorption of mash gas measuring device is pulverized in c, connection,
Check the impermeability of air path part, guarantee air-channel system and pulverize between bucket, the lid air tight;
D, pulverize coal sample, should first open cycle water pump before the start, guarantee that recirculated cooling water moves earlier.Progressively heighten pulverizing speed by frequency converter, observation coal seams gas discharging quantity volume V
31Or V
32, when actual measurement desorb gas volume reaches single measuring tube maximum range 85%, open switch and measure with second measuring tube.The coal grain more than comminutor is pulverized 15min, but or be crushed to do not have desorb gas substantially and separate out till, guarantee 95% the sub-sieve of coal sample by 212 microns meshes after pulverizing simultaneously.
E, calculating coal core are pulverized the desorption of mash gas amount,
V in the formula
310---be scaled the actual measurement desorb gas volume of the following first part of coal sample of standard state, mL
V
31---first part of desorb gas volume that coal sample is measured in the crushing process, mL
Q
31---coal core desorption of mash gas amount, mL/g or m
3/ t
G
21---the coal sample quality of selected first part of coal sample of going, g
Q
32Calculate same Q
31
Measure when pulverizing the desorption of mash gas amount each time, the gas volume of separating sucking-off is scaled the gas volume that 20 ℃ of normal atmospheres are depressed, conversion method is the same, obtains the pulverizing desorption of mash gas amount Q of corresponding mass
31And Q
32With their mean value as pulverizing desorption of mash gas amount Q
3Measured value.If two parts of secondary coal sample test results have error greater than 10%, should get the 3rd part of secondary coal sample (also can directly get three parts of close coal samples of quality and measure, get close the calculating of measurement result) again as measurement result.
(5) but calculate coal core desorbing mash gas content;
But the desorbing mash gas content of actual measurement is: Q
m=Q
1+ Q
2+ Q
3
According to the above-mentioned relation model, worked out dedicated computing software.But open desorbing mash gas content and calculate little software, only need in blue frame, to import correlation parameter, just resolve or converse gas loss amount Q automatically
1, coal core desorption of mash gas amount Q
2, pulverize desorption of mash gas amount Q
3Thereby, but calculate the desorbing mash gas content value.
The present invention compares with prior art and has the following advantages: but can measure the coal seam desorbing mash gas content, it is less relatively to have the quantities of mensuration, cost of determination is lower, the mensuration cycle is short, minute is less than 8 hours, it is higher to measure reliability and accuracy rate, can carry out the measurement of big gauge point, but the coal seam desorbing mash gas content that utilizes this method to measure can be used for coal seam outburst hazard workplace and regional prediction, pre-gas pumping effect assessment and mine coal seam Forecast of Gas Emission etc. better.
Description of drawings
Fig. 1 is the principle schematic of down-hole and ground desorption of mash gas measuring device.
Fig. 2 is a synoptic diagram of pulverizing the desorption of mash gas measuring device.
Embodiment
Embodiment one: existing is example with Huainan Mining (Group) Co., Ltd. ore deposit, and measuring process is described, its step is as follows:
(1) down-hole coal core sampling
Boring is arranged: at this base plate lane, ore deposit construction layer-through drilling;
Drilling construction: the vertical bearing construction of holing, 66 ° at inclination angle, aperture φ 75mm, 55m stop boring after seeing seat earth, withdraw from drilling rod, begin to move back to bore to be 17: 14 on the 24th certain month of certain year constantly;
Get the coal core: press under the wind state at band and send φ 73mm individual layer corer to seat earth, begin to creep into, it is 18: 06 on the 24th certain month of certain year constantly that start-of-record creeps into, and creeps into coal sample to fill till the coal sample tube, is 18: 18 on the same day the finish time, and time t drills
1Be 12min, withdraw from corer, the coal core is put into the coal sample tube, close the air valve of coal sample tube;
(2) coal core gas loss amount Q is measured and calculated in the down-hole
1
The pressure and temperature of testing location under the measuring well, recording downhole testing place temperature with aneroid pressure meter and thermometer is T
1=27 ℃, atmospheric pressure is P
1=98kPa;
The device that uses is measured before the beginning referring to Fig. 1, opens case lid 7, at first, fill water in first tank 9, thermometer 8 is measured water temperature, opens first spring clamp 4, draw water with first hand pump 6, make in first buret 5 and fill water to 0 scale, close first spring clamp.Linked first exhaust hose 3 between the coal sample tube 1 and first buret 5, opened the air valve 2 of coal sample tube 1, the methane gas that desorbs is discharged the water in first buret by pipeline 3, measures till liquid level stops to descend to first buret 5.
Measure the effusion gas amount,, in the air valve 2 of opening the coal sample tube, write down reading and time, begin mensuration and constantly be 19: 16 on the same day, move back and bore the time t that begins to beginning desorb mensuration by the bottom of first exhaust hose, the 3 connection coal sample tubes 1 and first buret 5
2Be 58min.Initial scale is 50mL, starts stopwatch at once after running through first number, the per minute record desorb methane gas volume of once overflowing, and having measured the 58min desorption quantity is V
21=756mL closes gas check valve band upper ground surface;
Be t lost time as calculated
0=12/2+58=64min, this coal sample integrality is good, and the desorption of mash gas PARAMETER ALPHA gets 0.5, and desorption of mash gas amount and the input of the pairing moment with the down-hole per minute go out V according to the relational model The Fitting Calculation
1=3550.6mL, temperature, pressure calibration automatically in the calculating section program in the end.Measure coal sample general assembly (TW) G=1066g in the ground experiment chamber.
Q
1＝3550.6/1066＝3.33m
3/t
(3) coal core desorption of mash gas amount is measured and is calculated on ground;
Surface temperature T
2=27 ℃, atmospheric pressure is P
2=100.97kPa.
The bottom that connects the coal sample tube 1 and first buret 5 by first exhaust hose 3, record reading and time in the air valve 2 of opening the coal sample tube, 2min reads the desorption quantity of a gas at interval, and liquid level stops to descend behind the desorb gas 70min, and the ground coal seams gas discharging quantity is V
22=1305mL.
Weigh coal sample general assembly (TW) G=1066g after measuring end.
Q
2＝1990.6/1066＝1.86m
3/t
(4) mensuration and calculating section coal core are pulverized the desorption of mash gas amount
Coal sample is divided into 3 parts, and weight is respectively G
21=303g, G
22=301g, G
23=306g.The 3rd part of coal sample is standby.
Coal sample is pounded to than granule with iron hammer, and maximum particle size is no more than 10mm, the secondary coal sample is put into pulverized bucket, builds and pulverizes bung and seal tight.
Referring to 2, measure before the beginning, at first in second tank 21, fill water, open second spring clamp 18, draw water with second hand pump 20, make in second buret 19 and fill water to 0 scale, close second spring clamp.Connect second exhaust hose of pulverizing between jar 10 and second buret 19 17.Switch on the pump 13, enter the interlayer of pulverizing jar from the bottom of pulverizing jar by inlet pipeline 16, flowing through flows into circulating water pools 15 from outlet pipeline 14 after pulverizing jar interlayer.This reducing mechanism is desorb gas while pulverizing, frame 12 connects motor 11 and pulverizes jar 10, motor 11 drives pulverizes coal samples, and a large amount of gas of desorb are discharged the water in second buret 19 by second exhaust hose 17, measures till liquid level stops to descend to second buret.
Bottom by second exhaust hose, 17 connection pulverizing jars, 10 and second burets 19 switches on the pump 13, enters the interlayer of pulverizing jar 10 from pulverizing jar 10 bottoms by inlet pipeline 16, flows into circulating water pools 15 from outlet pipeline 14 behind the pulverizing jar interlayer of flowing through.This reducing mechanism is desorb gas while pulverizing, and motor 11 drives pulverizes coal sample, and a large amount of gas of desorb are discharged the water in second buret by second exhaust hose 17, observe the second buret liquid level data, and about 15min liquid level stops to descend measuring and finishes.
Pulverize the after gas desorption quantity and be respectively V
31=485mL, V
32=501mL, between the two error in 10%, the Pass Test requirement, effectively.Be calculated as follows Q
3
(5) but calculate coal core desorbing mash gas content;
But the desorbing mash gas content of actual measurement is: Qm=Q
1+ Q
2+ Q
3=6.73m
3/ t.
Embodiment two: existing with Huainan Mining (Group) Co., Ltd. * * * ore deposit is an example, and measuring process is described, its step is as follows:
(1) down-hole coal core sampling
Boring is arranged: the Huainan * * * the suitable layer boring of pit coal lane headwork surface construction;
Drilling construction: boring is along bearing construction, inclination angle+2 °, and aperture φ 108mm, drilling depth 23m enter original gas pressure district and stop boring, and withdraw from drilling rod, begin to move back to bore to be 9: 05 on the 5th certain month of certain year constantly;
Get the coal core: press at band and send the double-deck corer of φ 90mm to seat earth under the wind state, begin to creep into, start-of-record creeps into constantly to certain 9: 46 on the 5th moon of certain year, creeps into coal sample to fill till the coal sample tube, and be 20 10: 0 on the same day the finish time, and time t drills
1Be 14min, withdraw from corer, the coal core is put into the coal sample tube;
(2) coal core gas loss amount Q is measured and calculated in the down-hole
1
The pressure and temperature of testing location under the measuring well, recording downhole testing place temperature with aneroid pressure meter and thermometer is T
1=27.5 ℃, atmospheric pressure is P
1=97.8kPa;
Referring to Fig. 1, measure before the beginning, open case lid 7, at first, in first tank 9, fill water, thermometer 8 is measured water temperature, opens first spring clamp 4, draws water with first hand pump 6, makes in first buret 5 and fills water to 0 scale, closes first spring clamp.Linked first exhaust hose 3 between the coal sample tube 1 and first buret 5, opened the air valve 2 of coal sample tube 1, the methane gas that desorbs is discharged the water in first buret by pipeline 3, measures till liquid level stops to descend to first buret 5.
Measure the effusion gas amount,, in the air valve 2 of opening the coal sample tube, write down reading and time, begin mensuration and constantly be 10: 52 on the same day, move back and bore the time t that begins to beginning desorb mensuration by the bottom of first exhaust hose, the 3 connection coal sample tubes 1 and first buret 5
2Be 52min.Initial scale is 80mL, starts stopwatch at once after running through first number, the per minute record desorb methane gas volume of once overflowing, and having measured the 50min desorption quantity is V
21=521mL closes gas check valve 2 band upper ground surfaces;
Be t lost time as calculated
0=14/2+52=59min, this coal sample is powdery, and the desorption of mash gas PARAMETER ALPHA gets 0.3, and desorption of mash gas amount and the input of the pairing moment with the down-hole per minute go out V according to the relational model The Fitting Calculation
1=2890.5mL, temperature, pressure calibration automatically in the calculating section program in the end. measure coal sample general assembly (TW) G=983g. in the ground experiment chamber
Q
1＝2890.5/983＝2.94m
3/t
(3) coal core desorption of mash gas amount is measured and is calculated on ground;
Ground experiment room environmental temperature is T
2=27 ℃, atmospheric pressure is P
2=100.97kPa.
The bottom that connects the coal sample tube 1 and first buret 5 by first exhaust hose 3, record reading and time in the air valve 2 of opening the coal sample tube, 2min reads the desorption quantity of a gas at interval, and liquid level stops to descend behind the desorb gas 50min, and the ground coal seams gas discharging quantity is V
22=1100mL.
Weigh coal sample general assembly (TW) G=983g after measuring end.
Q
2＝1565.9/983＝1.59m
3/t
(4) mensuration and calculating section coal core are pulverized the desorption of mash gas amount
Coal sample is divided into 3 parts, and weight is respectively G
21=300g, G
22=305g, G
23=290g.The 3rd part of coal sample is standby.
Coal sample is pounded to than granule with iron hammer, and maximum particle size is no more than 10mm, the secondary coal sample is put into pulverized bucket, builds and pulverizes bung and seal tight.
Referring to 2, measure before the beginning, at first in second tank 21, fill water, open second spring clamp 18, draw water with second hand pump 20, make in second buret 19 and fill water to 0 scale, close second spring clamp.Connect second exhaust hose of pulverizing between jar 10 and second buret 19 17.Switch on the pump 13, enter the interlayer of pulverizing jar from the bottom of pulverizing jar by inlet pipeline 16, flowing through flows into circulating water pools 15 from outlet pipeline 14 after pulverizing jar interlayer.This reducing mechanism is desorb gas while pulverizing, frame 12 connects motor 11 and pulverizes jar 10, motor 11 drives pulverizes coal samples, and a large amount of gas of desorb are discharged the water in second buret 19 by second exhaust hose 17, measures till liquid level stops to descend to second buret.
Bottom by second exhaust hose, 17 connection pulverizing jars, 10 and second burets 19 switches on the pump 13, enters the interlayer of pulverizing jar from pulverizing jar bottom by inlet pipeline 16, flows into circulating water pools 15 from outlet pipeline 14 behind the pulverizing jar interlayer of flowing through.This reducing mechanism is desorb gas while pulverizing, and motor 11 drives pulverizes coal sample, and a large amount of gas of desorb are discharged the water in second buret 19 by second exhaust hose 17, observe the second buret liquid level data, and about 12min liquid level stops to descend measuring and finishes.
Pulverize the after gas desorption quantity and be respectively V
31=301mL, V
32=600mL, error illustrates one of them coal sample mensuration failure greater than 10% between the two, carries out the 3rd sample test V again
33=325mL and first sample are approaching, and error illustrates this test effectively in 10% between the two.
(5) but calculate coal core desorbing mash gas content;
But the desorbing mash gas content of actual measurement is: Qm=Q
1+ Q
2+ Q
3=5.51m
3/ t.
Claims (4)
- But 1. the direct and quick determination method of coal seam desorbing mash gas content, its step is as follows:(1) down-hole coal core sampling;A, boring arranges, selects lane group to arrange boring or meets head on move towards to arrange boring or wear floor layout in the base plate tunnel district and hole at mining face under mine;B, boring according to the dip angle of hole that designs, orientation, the degree of depth and aperture, with drilling machine construction boring, drain residual powder in the hole as far as possible after having bored, withdraw from drilling tool then fast;C, get the coal core, fast down at the bottom of the hole, and in corer down, open and press wind to maximum with corer on the drilling rod band; Corer is adjusted drilling parameter after arriving at the bottom of the hole down, carries out sample drilling, writes down the trip-out time simultaneously; Drilling process is with hydraulic slag discharging or wind power ganged deslagging, creep into fill to corer till, record creeps into the concluding time; Withdraw from corer fast, getting coal sample is carried out suitable sorting, put into the coal sample tube, the record coal sample tube sealing time;(2) coal core gas loss amount is measured and calculated in the down-hole;The pressure and temperature of testing location under a, the measuring well is with aneroid pressure meter and thermometer test and record downhole testing place atmospheric pressure P 1And temperature T 1B, measurement effusion gas amount, connect coal sample tube and down-hole volumetric measurement device, record reading and time in the air valve of opening the coal sample tube, start stopwatch at once after running through first number, per minute writes down the desorb methane gas volume of once overflowing, time is that 45～60min finishes, and turns off coal sample tube air valve;C, calculating gas loss amount Q 1, coal sample is in initial one period exposure duration, and there are following relational model in accumulative total coal seams gas discharging quantity and coal sample desorption of mash gas time:V＝k(t 0+t) α (I)V in the formula---coal sample is from exposing beginning up to t 0Total desorption of mash gas amount during+t,t 0---the exposure duration before the coal sample desorb is measured,T---desorb minute,K---proportionality constant,α---desorb characteristic parameter,Desorption of mash gas loss amount V 1For:V 1＝kt 0 α (II)The desorption of mash gas amount V of test determination then 2For:V 2＝V-V 1＝k(t 0+t) α-V 1 (III)Can obtain desorption of mash gas loss amount V according to above-mentioned relation model and measured data match 1, V 1After standard state, can obtain Q through temperature, pressure correction 1V in the formula 10---be scaled desorption of mash gas loss volume under the standard state,P 1---downhole testing place atmospheric pressure,P 0---normal atmospheric pressure,T 1---the place temperature is measured in the down-hole,Q 1---the gas loss amount,G---collection analysis coal sample quality;(3) coal core desorption of mash gas amount is measured and is calculated on ground;A, recording laboratory environment temperature T 2, atmospheric pressure P 2B, measurement desorption of mash gas amount, debugging is breadboard volumetric measurement device well, and is connected with the coal sample tube, slowly opens coal sample tube air valve, reads the desorption quantity of a gas at interval every 2～10min; When actual measurement desorb gas volume reaches single measuring tube maximum range 85%, open switch and measure with second measuring tube; Minute is no less than 1h;C, measurement are weighed after finishing, the gas amount V that record discharges 22, take out coal sample, and remove the G that weighs behind the tangible external spoil impurity 1D, calculating coal core desorption of mash gas amount Q 2, coal core desorption of mash gas amount Q 2Form by two parts, i.e. the desorption quantity V of down-hole mensuration 21With experimental determination desorption quantity V 22, its computing method are undertaken by (VI), (VII) formula:V in the formula 20---be scaled actual measurement desorb gas volume under the standard state,V 21---the desorb gas volume that the down-hole is measured,V 22---experimental determination desorb gas volume,P 2---the laboratory atmospheric pressure,T 2---the laboratory environment temperature,Q 2---coal core desorption of mash gas amount,G 1---remove the coal sample quality behind the tangible external spoil impurity;(4) mensuration and calculating section coal core are pulverized desorption of mash gas amount Q 3A, get coal sample, get two parts of secondary coal samples that quality is close from the coal core, the quality of secondary coal sample is 15 to restrain 300 grams, selects the coal sample of whole core, guarantee the secondary coal sample and full coal sample identical characteristic is arranged;B, coal sample are weighed and are smashed, the quality G of every part of secondary coal sample 21, G 22, to pound to than granule with iron hammer then, maximum particle size is no more than 10mm, the secondary coal sample is put into pulverized bucket, builds and pulverizes bung and seal tight;C, connect the volumetric measurement device, check the impermeability of air path part, guarantee air-channel system and pulverize between bucket, the lid air tight;D, pulverize coal sample, should first open cycle water pump before the start, guarantee that recirculated cooling water moves earlier; Progressively heighten pulverizing speed by frequency converter, observation coal seams gas discharging quantity volume V 31Or V 32, when actual measurement desorb gas volume reaches single measuring tube maximum range 85%, to open switch and measures with second measuring tube, the coal grain is pulverized more than the 15min at comminutor, guarantees that simultaneously the coal sample after 95% pulverizing passes through the sub-sieve of 212 microns meshes;E, calculating coal core are pulverized the desorption of mash gas amount,V in the formula 310---be scaled the actual measurement desorb gas volume of the following first part of coal sample of standard state,V 31---first part of desorb gas volume that coal sample is measured in the crushing process,Q 31---coal core desorption of mash gas amount,G 21---the coal sample quality of first part of selected coal sample,Q 32Calculate same Q 31Measure when pulverizing the desorption of mash gas amount each time, the gas volume of separating sucking-off is scaled the gas volume that 20 ℃ of normal atmospheres are depressed, conversion method is the same, obtains the pulverizing desorption of mash gas amount Q of corresponding mass 31And Q 32, with their mean value as pulverizing desorption of mash gas amount Q 3Measured value; If two parts of secondary coal sample test results have error greater than 10%, should ascertain the reason, get the 3rd part of secondary coal sample again and measure, perhaps directly get three parts of close coal samples of quality and measure, get close the calculating of measurement result as measurement result;(5) but calculate coal core desorbing mash gas content;But the desorbing mash gas content of actual measurement is: Q m=Q 1+ Q 2+ Q 3
- 2. but the direct and quick determination method of coal seam according to claim 1 desorbing mash gas content is characterized in that: but drill and take complete coal core to measure the coal seam desorbing mash gas content by corer in the down-hole.
- 3. but the direct and quick determination method of coal seam according to claim 1 desorbing mash gas content is characterized in that: the exposure duration t before the coal sample desorb is measured 0Begin to finish to move back the time t of brill for getting core to taking a sample 1Half bore beginning to beginning the time t that desorb is measured with moving back 2The time sum.
- 4. but the direct and quick determination method of coal seam according to claim 1 desorbing mash gas content is characterized in that: the value of desorb PARAMETER ALPHA is decided span 0.25＜α＜0.5 according to the integrality of getting the core coal sample.
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