CN104614201A - Method for measuring raw CO gas content of coal seam - Google Patents
Method for measuring raw CO gas content of coal seam Download PDFInfo
- Publication number
- CN104614201A CN104614201A CN201510079748.XA CN201510079748A CN104614201A CN 104614201 A CN104614201 A CN 104614201A CN 201510079748 A CN201510079748 A CN 201510079748A CN 104614201 A CN104614201 A CN 104614201A
- Authority
- CN
- China
- Prior art keywords
- coal
- sample
- coal sample
- gas
- desorption
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000003245 coal Substances 0.000 title claims abstract description 161
- 238000000034 method Methods 0.000 title claims abstract description 80
- 239000007789 gas Substances 0.000 claims abstract description 95
- 238000003795 desorption Methods 0.000 claims abstract description 76
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 62
- 238000005070 sampling Methods 0.000 claims abstract description 33
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 31
- 238000005553 drilling Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 238000003556 assay Methods 0.000 claims description 10
- 238000011049 filling Methods 0.000 claims description 8
- 238000010298 pulverizing process Methods 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 238000011068 loading method Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 239000011435 rock Substances 0.000 claims description 5
- 239000000243 solution Substances 0.000 claims description 5
- 238000004064 recycling Methods 0.000 claims description 3
- 238000000227 grinding Methods 0.000 abstract description 4
- 238000007872 degassing Methods 0.000 abstract 1
- 238000000691 measurement method Methods 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 6
- 230000002269 spontaneous effect Effects 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 229910002091 carbon monoxide Inorganic materials 0.000 description 3
- 238000012795 verification Methods 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- NAWXUBYGYWOOIX-SFHVURJKSA-N (2s)-2-[[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]amino]-4-methylidenepentanedioic acid Chemical compound C1=CC2=NC(N)=NC(N)=C2C=C1CCC1=CC=C(C(=O)N[C@@H](CC(=C)C(O)=O)C(O)=O)C=C1 NAWXUBYGYWOOIX-SFHVURJKSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 206010033799 Paralysis Diseases 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000013501 data transformation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Landscapes
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a method for measuring raw CO gas content of a coal seam. The method comprises the following steps: obtaining a coal sample by adopting a wet type drilling sampling method, and placing the coal sample in a whole-course integrated closed sample tank of which the air impermeability is checked; after placing the coal sample, by utilizing the closed sample tank under the mine, and using a normal pressure desorption degassing method, obtaining the underground CO desorption amount; measuring the CO desorption amount of the coal sample before and after grinding in the closed sample tank by utilizing a normal pressure nitrogen-filled desorption method; correcting the measured underground CO desorption amount and the CO desorption amount of the coal sample before and after grinding by adopting a pressure change principle, and determining the CO loss in the process by virtue of the coal sample exposure time; and taking the sum of the corrected underground CO desorption amount, the CO desorption amount of the coal sample before and after grinding and the CO loss as the raw CO gas content of the coal seam. According to the measurement method disclosed by the invention, the raw CO gas content of the coal seam can be accurately measured.
Description
Technical field
The present invention relates to mine technology field, particularly relate to the assay method of the primary CO gas content in a kind of coal seam.
Background technology
Mainly indirect method is adopted, the state of the index gas comparison determination coal spontaneous combustion by the sample analysis of collection gas and with mensuration in the prediction, forecast of coal spontaneous ignition.CO (carbon monoxide) gas, because its concentration is large, highly sensitive, it is low to produce temperature, is conventional and effective index gas.But field practice shows, coal spontaneous ignition is not the exclusive source of down-hole CO gas, and part coal seam also can be composed and be deposited a certain amount of CO gas of absorption.Therefore, some mine probably occurs that in recovery process coal does not have spontaneous combustion and occurs the phenomenon that CO gas transfinites, the judgement of coal spontaneous combustion state and the normal production work of mine are impacted, judge by accident frequently and field staff more can be allowed to produce paralysis inwardly, cause larger hidden danger to prevention of mine fire hazard work.
In the research and on-the site analysis of prevention of mine fire hazard, it is generally acknowledged that the generation of coal seam CO gas was caused by Period of Coal Seam Spontaneous Combustion in the past, thus ignored the reasons such as the desorb release of ocurrence of coal seam CO absorption gas, and generated to mine safety and cause very large threat.At present, also do not have a kind of special coal seam primary CO eudiometry method, uncertain large, low, the weak effect of repeatability of some tentative means of testing, is therefore necessary to adopt special reliable method to carry out Accurate Determining to the primary CO gas content in coal seam.
Summary of the invention
The object of this invention is to provide the assay method of the primary CO gas content in a kind of coal seam, can measure the primary CO gas content in coal seam accurately.
The object of the invention is to be achieved through the following technical solutions:
An assay method for the primary CO gas content in coal seam, the method comprises:
Adopt wet boring sampling method to obtain coal sample, and coal sample is loaded in the airtight sample pot of the bubble-tight omnidistance integral type of inspected;
After loading coal sample, utilize this airtight sample pot in down-hole and use normal pressure nature degasifying method, obtaining down-hole CO desorption quantity;
Recycling normal pressure fills the CO desorption quantity that the nitrogen desorption method coal sample measured in airtight sample pot pulverizes front and back;
The down-hole CO desorption quantity adopting air pressure change principle correcting determination to arrive and coal sample pulverize the CO desorption quantity of front and back, then determine CO loss amount in mensuration process by coal sample open-assembly time;
Using correct after down-hole CO desorption quantity, coal sample pulverize before and after CO desorption quantity and CO loss amount sum as coal seam primary CO gas content.
Further, described employing wet boring sampling method obtains coal sample, and coal sample is loaded the airtight sample pot of the bubble-tight omnidistance integral type of inspected and comprise:
Layer-through drilling can be beaten in crossdrift or rock drift and take coal sample, uninterrupted water filling in the process of rod boring;
In the new coal road exposed, utilize coal core collector or other device for fixed point samplings fixed point samples of coal pulled, and load the airtight sample pot of the bubble-tight omnidistance integral type of inspected; Wherein, the particle diameter of coal sample is no more than 1/2 of airtight sample pot aperture.
Further, after described loading coal sample, utilize this airtight sample pot in down-hole and use normal pressure nature degasifying method, obtaining down-hole CO desorption quantity and comprise:
Adopt draining water gathering of gas law, airtight to CO desorption rate tester and this sample pot is connected, and continues the nitrogen injection some time by blow vent with preset flow, and gas is collected;
Nature is carried out to the gas collected and inhales solution: at interval of certain hour record buret reading and minute, till the Continuous Observation schedule time or desorption quantity are less than predetermined value; Down-hole CO desorption quantity is obtained according to buret reading.
Further, the described CO desorption quantity utilizing normal pressure to fill the coal sample pulverizing front and back that nitrogen desorption method measures in airtight sample pot comprises:
Before and after coal sample is pulverized, all under mass flowmeter controls, adopting normal pressure to fill nitrogen desorption method realizes degassed, adopt draining water gathering of gas law collect gas and gather gas sample again, until cannot be recorded containing CO gas in gas by chromatograph, thus obtain the CO desorption quantity that coal sample pulverizes front and back.
Further, describedly determine that in mensuration process, CO loss amount comprises by coal sample open-assembly time:
Combine according to coal sample open-assembly time
method or power index method determine the CO loss amount in mensuration process.
As seen from the above technical solution provided by the invention, adopt the wet boring of continuous water filling in drilling process to sample in coal sample collection process, that can reduce coal and air in sampling process directly contacts and the loss of contained gas; And, the airtight sample pot of omnidistance integral type is adopted in mensuration process, namely the normal pressure before and after degassed, the coal sample reduction of down-hole sampling fills in the process of nitrogen desorb and all uses same airtight sample pot, can decrement avoid coal sample to contact with the oxygen in air like this, reduce the possibility of error and mistake generation; In addition, adopt normal pressure to fill the method for nitrogen desorb, can effectively avoid outside air to enter in airtight sample pot to the degasifying of coal sample, the use of nitrogen further ensures coal sample on the one hand can not be oxidized, is also conducive to the desorb of gas in coal sample on the other hand.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
The process flow diagram of the assay method of the primary CO gas content in a kind of coal seam that Fig. 1 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on embodiments of the invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to protection scope of the present invention.
Embodiment
The process flow diagram of the assay method of the primary CO gas content in a kind of coal seam that Fig. 1 provides for the embodiment of the present invention.As shown in Figure 1, the method mainly comprises the steps:
Step 11, employing wet boring sampling method obtain coal sample, and coal sample are loaded in the airtight sample pot of the bubble-tight omnidistance integral type of inspected.
In the embodiment of the present invention, layer-through drilling can be beaten in crossdrift or rock drift and take coal sample, uninterrupted water filling in the process of rod boring; In the new coal road exposed, utilize coal core collector or other device for fixed point samplings fixed point samples of coal pulled, and load the airtight sample pot of the bubble-tight omnidistance integral type of inspected; Wherein, the particle diameter of coal sample is no more than 1/2 of airtight sample pot aperture.
After step 12, loading coal sample, utilize this airtight sample pot in down-hole and use normal pressure nature degasifying method, obtaining down-hole CO desorption quantity.
In the embodiment of the present invention, with draining water gathering of gas law, airtight to CO desorption rate tester and this sample pot is connected, and continues the nitrogen injection some time by blow vent with preset flow, and gas is collected; Nature is carried out to the gas collected and inhales solution: at interval of certain hour record buret reading and minute, till the Continuous Observation schedule time or desorption quantity are less than predetermined value; Down-hole CO desorption quantity is obtained according to buret reading.
Step 13, recycling normal pressure fill the CO desorption quantity that the nitrogen desorption method coal sample measured in airtight sample pot pulverizes front and back.
In the embodiment of the present invention, before and after coal sample is pulverized, all under mass flowmeter controls, adopting normal pressure to fill nitrogen desorption method realizes degassed, draining water gathering of gas law is adopted to collect gas and gather gas sample again, until cannot be recorded containing CO gas in gas by chromatograph, thus obtain the CO desorption quantity that coal sample pulverizes front and back.
Step 14, the down-hole CO desorption quantity adopting air pressure change principle correcting determination to arrive and coal sample pulverize the CO desorption quantity of front and back, then determine CO loss amount in mensuration process by coal sample open-assembly time.
In the embodiment of the present invention, combine according to coal sample open-assembly time
method or power index method determine the CO loss amount in mensuration process.
Step 15, using correct after down-hole CO desorption quantity, coal sample pulverize before and after CO desorption quantity and CO loss amount sum as coal seam primary CO gas content.
In addition, it is also conceivable to normal pressure can not measure by desorb CO, and CO desorption quantity, CO loss amount and normal pressure before and after pulverizing by down-hole CO desorption quantity, coal sample can not measure sum as the primary CO gas content in coal seam by desorb CO.
For the ease of understanding, be described in detail below in conjunction with the above-mentioned steps of a concrete example to the embodiment of the present invention.
1, the collection of coal sample
1) prepare before sampling
(1) all airtight sample pots for sampling must carry out air-leakage test before use; Air-leakage test, by air injection in airtight sample pot to more than gauge pressure 1.5MPa, shelves 12h after closedown, and pressure does not fall or puts it into bubble-free in water and produces and can use.
(2) desorption instrument is before the use, fills water by buret, closes bottom plug and is inverted and come, place the water surface in 10min buret do not drop to qualified.
2) samples of coal pulled
(1) sampling hole is arranged
Two tube sample borings at least should be arranged in same place, and sampling spot spacing is not less than 5m.
(2) sample mode
Layer-through drilling can be beaten in crossdrift or rock drift and take coal sample, uninterrupted water filling in the process of rod boring, should first-selected coal core collector (being called for short coal core pipe) or other device for fixed point samplings fixed point samples of coal pulled in the new coal road exposed.
(3) sampling depth
Sampling depth should exceed the coverage in tunnel, drilling construction place, and meets following requirement: when getting working face samples, sampling depth should be determined according to the open-assembly time of getting working face, but should not be less than 12m; When crossdrift or rock drift sampling, the vertical range apart from coal seam depending on lithology, but should should not be less than 5m.
(4) sampling time
Sampling time refers to that the coal sample for CO assay is sealed the real time used from being exposed to by the airtight sample pot of dress people, should more than 20s.
(5) sampling request
Following requirement should be met: adopt the wet method drive sampling of drilling rod water filling until coal sample is taken out during samples of coal pulled; For column coal core, take middle not containing the complete part of spoil, for powdery and lumped coal core, reject spoil and grinding burnt parts, only measure the coal sample that particle diameter is larger, but also should note the pore size sealing airtight sample pot, coal sample maximum particle diameter should not exceed 1/2 of aperture; Do not apply water cleaning coal sample, state of nature is kept to load in sealable tank, can not compacting, tank mouth retains about 50mm space, first derby during coal sample reduction will be put into airtight sample pot before dress sample, airtight sample pot and derby weight weigh (W1) before sampling.
(6) sample record
During sampling, following relevant parameters should be collected simultaneously and be recorded in sample record table: sampling position---mine title, coal seam title, buried depth (ground elevation, seat earth absolute altitude), sampling depth, bore direction, dip angle of hole; Sampling time---sampling start time, sampling end time, coal sample tinning end time; Numbering---tank number, sample number into spectrum.
2, assay method and step
1) down-hole nature desorb CO quantitative determination
(1) down-hole nature desorb CO quantitative determination adopts draining water gathering of gas law, CO desorption rate tester is connected with airtight sample pot, and continue nitrogen injection 4min by blow vent with 200ml/min flow, and gas is collected (G1), record its volume V
1, the natural desorb of rear beginning gas.
(2) at interval of certain hour record buret reading and minute, Continuous Observation (60 ~ 120) min or desorption quantity are less than 2cm
3till/min, and (G2) is collected to gas sample, record its volume V
2.Start to observe in front 30min, interval 1min reads a number, reads a number every (2-5) min later; Observed result is filled up to and measures in record sheet, record temperature, water temperature and atmospheric pressure simultaneously.
(3) after measuring and terminating, seal airtight sample pot, and sunk in people's clear water by airtight sample pot, examine 10min, emerge if find that there is bubble, then this sample cancels and should to resample test; As air tight, send continuation side, laboratory fixed.Gas sample G1 and G2 collected, uses in laboratory gas chromatograph to test wherein CO concentration, is denoted as C respectively
1and C
2.
2) remaining CO assay
(1) coal sample inspection and registration
After coal sample delivers to laboratory, carry out leak test by method above; As found, gas leakage is waste sample, check result is indicated in report; Check that coal sample send verification certificate and tank number whether to meet, whether experimental data is complete; After errorless on inspection, unified accession designation number, weighs (W2) to airtight sample pot, after carry out next step mensuration work.
(2) normal pressure fills nitrogen desorb
1. desorption system leak check
After buret being filled with water to certain altitude, isolated buret is in communication with the outside, after liquid level stabilizing, if the liquid level scale that declines in 5min is less than 2cm in buret
3then gas circuit sealing is qualified.
2. airtight sample pot is connected with desorption apparatus
By sebific duct, airtight sample pot and normal pressure are filled nitrogen desorption apparatus to be connected.
3. nitrogen desorb CO quantitative determination is filled before pulverizing
A. certain scale is filled to by desorb buret, read and record buret liquid level initial reading, first open snorkel nitrogen valve and slowly open airtight sample pot valve behind the door, a gas production is read every certain hour interval, analyze gas production whether with to pass into nitrogen amount basically identical, note abnormalities and process in time or scrap.
B. when surveying desorption gas volume and reaching the maximum most journey 80% of measuring tube, record gas production, opens switch by gas and discharges, and with gas collection bag collection sample (G3), gas volume is designated as
rear use gas chromatograph measures CO concentration
interval is repeated once for one hour until CO concentration, lower than 1ppm, follow-uply collects gas volume and concentration is designated as respectively in gas at every turn
with
...
by that analogy.
C. record the time that the temperature of desorb surrounding environment, atmospheric pressure, coal sample weight, tester and coal sample are sent to laboratory and started ground desorb, test determination data are filled out in people's record sheet.
4. pulverize and fill nitrogen desorb CO quantitative determination
A. leak check: carry out leak check by same procedure above.
B. pulverize coal sample: be loaded on coal sample reduction machine by airtight sample pot, continue broken 3h under certain vibration frequency.
C. pulverize and fill nitrogen desorb CO quantitative determination: by sebific duct, airtight sample pot and normal pressure are filled nitrogen desorption apparatus and be connected; Certain scale is filled to by desorb buret, read and record buret liquid level initial reading, first open snorkel nitrogen valve and slowly open airtight sample pot valve behind the door, a gas production is read every certain hour interval, analyze gas production whether with to pass into nitrogen amount basically identical, note abnormalities and process in time or scrap; When surveying desorption gas volume and reaching the maximum most journey 80% of measuring tube, record gas production, opens switch by gas and discharges, and with gas collection bag collection sample (G4), gas volume is designated as
rear use gas chromatograph measures CO concentration
interval is repeated once for one hour until CO concentration, lower than 1ppm, follow-uply collects gas volume and concentration is designated as respectively in gas at every turn
with
...
by that analogy.
D. measure and terminate rear taking-up coal sample, use precision balance to measure its weight (W3), roughly equal when analyzing the weight difference of all the other airtight sample pots twice weighing, as difference is no more than 1%, then think that W3 is coal sample weight.
E. record the time that the temperature of desorb surrounding environment, atmospheric pressure, coal sample weight, tester and coal sample are sent to laboratory and started ground desorb, test determination data are filled out in people's record sheet.
Be qualified when coal sample is crushed to the sub-sieve of 80% coal sample by 60 orders (0.25mm).
(3) component analysis
The gas sample taked send laboratory in time, uses gas chromatograph to carry out the various constituent analysis of gas.
3, data processing
1) gas volume corrects
(1) calibration principle
Normal pressure only adopts formula (1) to correct gas volume in buret under test environment conditions when filling nitrogen desorb.
(2) conversion of natural desorption quantity
By formula (1), each buret reading obtained in desorption process is scaled standard state lower volume:
In formula:
V
t'---be scaled the gas volume under standard state, unit is cubic centimetre (cm
3);
V
t---when aforementioned normal pressure fills nitrogen desorb and natural desorption quantity time the gas volume that obtains, that is, V
1, V
2,
and
unit is cubic centimetre (cm
3);
P
1-atmospheric pressure, unit is kPa (kPa);
T
w---water temperature in buret, unit is degree Celsius (DEG C);
H
w---water colunm height in buret, unit is millimeter (mm);
P
2-T
wtime water saturation vapour pressure, unit is kPa (kPa).
Each buret reading is converted one by one and inserts in record sheet.
2) loss amount calculates
(1) calculating of coal sample desorption time
1. open-assembly time (t
0) terminate the time used for being exposed to tinning from coal sample, calculate by formula (2):
t
0＝t
2-t
1(2)
In formula:
T
0---open-assembly time, unit is point (min);
T
1---get coal core (bits) start time, time: point: second;
T
2---tinning terminates (down-hole desorb measures and the starts) moment, time: point: second.
2. the desorption time of coal sample is open-assembly time t
0after tinning, side time t sum is seen in desorb, is designated as t
0+ t.
(2) calculating of gas flow is lost
CO loss amount can according to actual measurement rule choose below two kinds of methods or other calculate through verification experimental verification effective method.
1.
method
The method be according to coal sample to start to expose in a period of time V with
in linear relationly to determine, that is:
In formula:
V---the accumulative desorption quantity in the t time, unit is cubic centimetre (cm
3);
V
damage' open-assembly time t one by one
0interior loss amount, unit is cubic centimetre (cm
3);
K---undetermined constant.
Calculate V
damagebefore ' value first with
for horizontal ordinate, be that ordinate is mapped with V, by scheming roughly to judge linear each measuring point, then according to the coordinate figure of these points, by least square method or do figure method and obtain V
damage' value.
2. power function method
By (t, the V that record
t) data transformations be desorption rate data (
q
i), and fill out in record sheet, so to (
q
i) obtain q by formula (4) matching
0and n.
q
t＝q
0·(1+t)
-n(4)
In formula:
Q
t---the gas desorption speed of t time, unit is cubic centimetre per minute (cm
3/ min);
Q
0---t
0time desorption rate, unit is cubic centimetre per minute (cm
3/ min);
T---desorption time, unit is point (min);
N---desorption rate attenuation coefficient, 0<n<1.
The loss amount of coal sample gas calculates by formula (6).
In formula:
V
damage' coal sample open-assembly time t one by one
0interior loss amount, unit is cubic centimetre (cm
3);
T
0---coal sample open-assembly time, unit is point (min).
3) coal seam CO cubage
(1) the coal sample CO gauge in each stage is calculated
Down-hole CO desorption quantity X
1, CO loss amount X
2, CO desorption quantity X before pulverizing
3and the CO desorption quantity X after pulverizing
4, calculate by formula (6)-(9):
In formula:
X
i---each stage coal sample CO measures (i=1,2,3,4), and unit is cubic centimetre every gram (cm
3/ g);
M---coal sample quality (being divided into air dried basis and dry ash-free basis), unit is gram (g);
V
1', V
2',
---be respectively the gas volume in each stage after formula (1) calibration, unit is cubic centimetre (cm
3);
V'
damage---coal sample open-assembly time t
0interior loss amount, unit is cubic centimetre (cm
3);
C
damage---CO concentration in loss gas, approximate think equal down-hole desorption gas CO concentration, i.e. C
damage=C
2;
C
1, C
2,
---each stage CO gas concentration (j=1,2,3 ... n), unit is ppm (10
-6).
In addition, it is also conceivable to normal pressure can not measure by desorb CO.Normal pressure can not be measured and can calculate or adopt by formula (10) the normal pressure adsorbance that MT/T 752 method measures by desorb CO, and the free CO content sum under normal pressure CO absorption amount and normal atmosphere pressure condition is normal pressure and can not measures by desorb CO.
In formula:
X
b---coal can not measure by desorb CO under normal atmospheric pressure, unit is cubic centimetre every gram (cm
3/ g);
The CO absorption constant of a---coal, the limit absorption amount of coal under test temperature, unit is cubic centimetre every gram (cm
3/ g);
The CO absorption constant of b coal one by one, unit is every MPa (MPa
-1);
A
ad---pit ash, %;
M
ad---the moisture of coal, %;
The porosity of π---coal, unit is cubic centimetre every cubic centimetre (cm
3/ cm
3);
The unit weight (apparent specific gravity (gd)) of γ---coal, unit is gram every cubic centimetre of (g/cm
3).
(2) coal seam CO cubage
Calculate by formula (11):
X＝X
1+X
2+X
3+X
4+X
b.....................(11)
In formula:
X
1---the down-hole desorb CO of coal sample measures, and unit is cubic centimetre every gram (cm
3/ g);
X
2---the loss CO of coal sample measures, and unit is cubic centimetre every gram (cm
3/ g);
X
3before coal sample pulverizing, desorb CO measures one by one, and unit is cubic centimetre short gram of (cm
3/ g);
X
4---coal sample is pulverized rear desorb CO and is measured, and unit is cubic centimetre every gram (cm
3/ g);
X
b---can not measure by desorb CO, unit is cubic centimetre every gram (cm
3/ g).
4) computational accuracy requirement
After above-mentioned evaluation presses Figure correction rule treatments, only retain four decimals.When calculated value is less than four decimals, only write exactly " trace " in mensuration report.
In the embodiment of the present invention, adopt the wet boring of continuous water filling in drilling process to sample in coal sample collection process, that can reduce coal and air in sampling process directly contacts and the loss of contained gas; And, the airtight sample pot of omnidistance integral type is adopted in mensuration process, namely the normal pressure before and after degassed, the coal sample reduction of down-hole sampling fills in the process of nitrogen desorb and all uses same airtight sample pot, can decrement avoid coal sample to contact with the oxygen in air like this, reduce the possibility of error and mistake generation; In addition, adopt normal pressure to fill the method for nitrogen desorb, can effectively avoid outside air to enter in airtight sample pot to the degasifying of coal sample, the use of nitrogen further ensures coal sample on the one hand can not be oxidized, is also conducive to the desorb of gas in coal sample on the other hand.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (5)
1. an assay method for the primary CO gas content in coal seam, it is characterized in that, the method comprises:
Adopt wet boring sampling method to obtain coal sample, and coal sample is loaded in the airtight sample pot of the bubble-tight omnidistance integral type of inspected;
After loading coal sample, utilize this airtight sample pot in down-hole and use normal pressure nature degasifying method, obtaining down-hole CO desorption quantity;
Recycling normal pressure fills the CO desorption quantity that the nitrogen desorption method coal sample measured in airtight sample pot pulverizes front and back;
The down-hole CO desorption quantity adopting air pressure change principle correcting determination to arrive and coal sample pulverize the CO desorption quantity of front and back, then determine CO loss amount in mensuration process by coal sample open-assembly time;
Using correct after down-hole CO desorption quantity, coal sample pulverize before and after CO desorption quantity and CO loss amount sum as coal seam primary CO gas content.
2. method according to claim 1, is characterized in that, described employing wet boring sampling method obtains coal sample, and coal sample is loaded the airtight sample pot of the bubble-tight omnidistance integral type of inspected and comprise:
Layer-through drilling can be beaten in crossdrift or rock drift and take coal sample, uninterrupted water filling in the process of rod boring;
In the new coal road exposed, utilize coal core collector or other device for fixed point samplings fixed point samples of coal pulled, and load the airtight sample pot of the bubble-tight omnidistance integral type of inspected; Wherein, the particle diameter of coal sample is no more than 1/2 of airtight sample pot aperture.
3. method according to claim 1, is characterized in that, after described loading coal sample, utilizes this airtight sample pot and uses normal pressure nature degasifying method, obtain down-hole CO desorption quantity and comprise in down-hole:
Adopt draining water gathering of gas law, airtight to CO desorption rate tester and this sample pot is connected, and continues the nitrogen injection some time by blow vent with preset flow, and gas is collected;
Nature is carried out to the gas collected and inhales solution: at interval of certain hour record buret reading and minute, till the Continuous Observation schedule time or desorption quantity are less than predetermined value; Down-hole CO desorption quantity is obtained according to buret reading.
4. method according to claim 1, is characterized in that, the described CO desorption quantity utilizing normal pressure to fill the coal sample pulverizing front and back that nitrogen desorption method measures in airtight sample pot comprises:
Before and after coal sample is pulverized, all under mass flowmeter controls, adopting normal pressure to fill nitrogen desorption method realizes degassed, adopt draining water gathering of gas law collect gas and gather gas sample again, until cannot be recorded containing CO gas in gas by chromatograph, thus obtain the CO desorption quantity that coal sample pulverizes front and back.
5. method according to claim 1, is characterized in that, describedly determines that in mensuration process, CO loss amount comprises by coal sample open-assembly time:
Combine according to coal sample open-assembly time
method or power index method determine the CO loss amount in mensuration process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510079748.XA CN104614201A (en) | 2015-02-13 | 2015-02-13 | Method for measuring raw CO gas content of coal seam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510079748.XA CN104614201A (en) | 2015-02-13 | 2015-02-13 | Method for measuring raw CO gas content of coal seam |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104614201A true CN104614201A (en) | 2015-05-13 |
Family
ID=53148748
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510079748.XA Pending CN104614201A (en) | 2015-02-13 | 2015-02-13 | Method for measuring raw CO gas content of coal seam |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104614201A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104880543A (en) * | 2015-06-16 | 2015-09-02 | 西安科技大学 | Experiment device and method for underground coal mine CO source mechanism and disappearing mechanism research |
| CN106370820A (en) * | 2016-11-10 | 2017-02-01 | 淮南矿业(集团)有限责任公司 | Method for researching oxidization degree of coal seam during drilling down coal seam by adopting nitrogen deslagging |
| CN107941690A (en) * | 2017-12-20 | 2018-04-20 | 中国矿业大学(北京) | It is a kind of to produce the method and device that CO is tested to coal body for impact grinding effect |
| CN108279283A (en) * | 2018-05-03 | 2018-07-13 | 华北理工大学 | To the measurement device of multicomponent gas adsorption-desorption characteristics in Coal Self-ignition Process |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5388641A (en) * | 1993-11-03 | 1995-02-14 | Amoco Corporation | Method for reducing the inert gas fraction in methane-containing gaseous mixtures obtained from underground formations |
| US5439054A (en) * | 1994-04-01 | 1995-08-08 | Amoco Corporation | Method for treating a mixture of gaseous fluids within a solid carbonaceous subterranean formation |
| CN102128765A (en) * | 2010-12-09 | 2011-07-20 | 中国矿业大学 | Method for directly and rapidly measuring coal seam gas content in underground coal mine |
| CN102536305A (en) * | 2012-03-06 | 2012-07-04 | 中国矿业大学 | Method for increasing permeability of inert gas and extracting gas |
| CN103558117A (en) * | 2013-11-12 | 2014-02-05 | 中国矿业大学 | Corrosion-resistant multifunctional low-gas-containing bulk sample content desorber |
-
2015
- 2015-02-13 CN CN201510079748.XA patent/CN104614201A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5388641A (en) * | 1993-11-03 | 1995-02-14 | Amoco Corporation | Method for reducing the inert gas fraction in methane-containing gaseous mixtures obtained from underground formations |
| US5439054A (en) * | 1994-04-01 | 1995-08-08 | Amoco Corporation | Method for treating a mixture of gaseous fluids within a solid carbonaceous subterranean formation |
| CN102128765A (en) * | 2010-12-09 | 2011-07-20 | 中国矿业大学 | Method for directly and rapidly measuring coal seam gas content in underground coal mine |
| CN102536305A (en) * | 2012-03-06 | 2012-07-04 | 中国矿业大学 | Method for increasing permeability of inert gas and extracting gas |
| CN103558117A (en) * | 2013-11-12 | 2014-02-05 | 中国矿业大学 | Corrosion-resistant multifunctional low-gas-containing bulk sample content desorber |
Non-Patent Citations (3)
| Title |
|---|
| 姜文忠等: "《中华人民共和国国家标准 GB/T 23250-2009煤层瓦斯含量井下直接测定方法》", 11 March 2009 * |
| 李小彦等: "《中华人民共和国国家标准 GB/T 19559-2008 煤层气含量测定方法》", 29 July 2008 * |
| 邬剑明等: "解吸法测定塔山矿煤层原生CO含量的试验研究", 《煤炭科学技术》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104880543A (en) * | 2015-06-16 | 2015-09-02 | 西安科技大学 | Experiment device and method for underground coal mine CO source mechanism and disappearing mechanism research |
| CN104880543B (en) * | 2015-06-16 | 2016-08-31 | 西安科技大学 | Underground coal mine CO source mechanism and disappearance study mechanism are experimentally |
| CN106370820A (en) * | 2016-11-10 | 2017-02-01 | 淮南矿业(集团)有限责任公司 | Method for researching oxidization degree of coal seam during drilling down coal seam by adopting nitrogen deslagging |
| CN106370820B (en) * | 2016-11-10 | 2018-05-08 | 淮南矿业(集团)有限责任公司 | The method that coal seam degree of oxidation in this coal seam concordant drilling is studied using nitrogen deslagging |
| CN107941690A (en) * | 2017-12-20 | 2018-04-20 | 中国矿业大学(北京) | It is a kind of to produce the method and device that CO is tested to coal body for impact grinding effect |
| CN107941690B (en) * | 2017-12-20 | 2023-12-19 | 中国矿业大学(北京) | Method and device for testing CO generated by coal body aiming at impact crushing effect |
| CN108279283A (en) * | 2018-05-03 | 2018-07-13 | 华北理工大学 | To the measurement device of multicomponent gas adsorption-desorption characteristics in Coal Self-ignition Process |
| CN108279283B (en) * | 2018-05-03 | 2023-08-11 | 华北理工大学 | Device for measuring adsorption and desorption characteristics of multi-component gas in coal spontaneous combustion process |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Kissell et al. | The direct method of determining methane content of coalbeds for ventilation design | |
| Campbell | Determination and use of soil bulk density in relation to soil compaction | |
| CN106885755B (en) | Method and device for rapidly measuring coal seam gas parameters under coal mine | |
| CN101135621B (en) | Direct rapid measuring method capable of desorbing mash gas content with coal seam | |
| CN101131352B (en) | In-situ measuring method and device for solum carbon dioxide flux | |
| CN104614201A (en) | Method for measuring raw CO gas content of coal seam | |
| McCulloch | Measuring the methane content of bituminous coalbeds | |
| CN101846604B (en) | Detection method of grouting reinforcement effect in tunnel | |
| CN102830038A (en) | Apparatus and method for rapid determination of parameters of residual gas on mining working face of underground coal mine | |
| CN113447397B (en) | Experimental system and experimental method for calibrating measurement error of coal seam gas content | |
| CN104636532A (en) | Hole sealing depth and length determining method for coal mine gas extraction drilled hole | |
| Hauser | Neutron meter calibration and error control | |
| CN105043920A (en) | Test method for measuring rock mass constant temperature adsorption and monitoring rock mass strain and instrument | |
| CN108444856B (en) | Rapid tester and testing method for gas content and pressure of underground coal seam of coal mine | |
| CN211178852U (en) | Verification and calibration device for pore water pressure gauge | |
| CN107144625A (en) | Gas hydrates drill core light hydrocarbon gas content parses test system and method | |
| CN104964894B (en) | A kind of assay method of coal seam hydrogen sulfide content | |
| Quinteros et al. | Shallow depth characterisation and stress history assessment of an over-consolidated sand in Cuxhaven, Germany | |
| Plaksin et al. | Framework for innovative determination of natural gas content in coal seams | |
| CN107290396A (en) | Coal petrography adsorption-desorption integral resistance rate measurement apparatus | |
| JPH0647813B2 (en) | Low water pressure control hydraulic test method | |
| CN114428166B (en) | Stratum oil-gas-containing property evaluation method and system | |
| CN206772969U (en) | A kind of ocean gas hydrate integrates on-line measuring device with ship | |
| US20220074906A1 (en) | Device and method for measuring radon release amount during rock shearing damage process | |
| Campbell et al. | Bulk density |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150513 |