CN110031255A - Low-temperature negative-pressure coal sample coal seam gas-bearing capacity spot sampling system and sampling method - Google Patents
Low-temperature negative-pressure coal sample coal seam gas-bearing capacity spot sampling system and sampling method Download PDFInfo
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- CN110031255A CN110031255A CN201910398751.6A CN201910398751A CN110031255A CN 110031255 A CN110031255 A CN 110031255A CN 201910398751 A CN201910398751 A CN 201910398751A CN 110031255 A CN110031255 A CN 110031255A
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- 239000003245 coal Substances 0.000 title claims abstract description 162
- 238000005070 sampling Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000005553 drilling Methods 0.000 claims abstract description 50
- 238000001816 cooling Methods 0.000 claims description 13
- 238000000605 extraction Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 4
- 241001074085 Scophthalmus aquosus Species 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000012546 transfer Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 38
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 16
- 239000007788 liquid Substances 0.000 description 8
- 229910052757 nitrogen Inorganic materials 0.000 description 8
- 238000003795 desorption Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000010985 leather Substances 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000007115 recruitment Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/16—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using gaseous fluids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
- G01N1/08—Devices for withdrawing samples in the solid state, e.g. by cutting involving an extracting tool, e.g. core bit
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Abstract
The invention discloses a kind of low-temperature negative-pressure coal sample coal seam gas-bearing capacity spot sampling systems, including pneumatic drilling machine, pneumatic drilling machine is equipped with hollow drill pipe, the front end of hollow drill pipe is equipped with drill bit, air compressor is connected with vortex cold wind mechanism by air supply tube, and vortex cold wind mechanism is connected by air duct with the inner cavity of hollow drill pipe；Coal seam wall at boring point is equipped with draught hood, and hollow drill pipe passes through the sliding sleeve in draught hood；First annular cavity is surrounded between sliding sleeve and draught hood inner wall；Draught hood is connected with exhaust column, and exhaust column is connected with sampler, and sampler is connected with negative pressure pump.The invention also discloses sampling methods.Slack coal transfer efficiency of the present invention is high, sampling amount is larger, slack coal low temperature can be taken out while drilling, sample rate is fast, both room temperature sampling had been avoided to cause gas release in slack coal excessive, avoiding sample time length to cause in slack coal again, gas release is excessive, improves the order of accuarcy of coal seam gas-bearing capacity measurement.
Description
Technical field
The present invention relates to coal-mine gas content determination techniques fields, and in particular to a kind of system and method for coal sample sampling.
Background technique
Coal seam gas-bearing capacity be coal mine gas diaster prevention and control, coal-bed gas take out in advance recruitment evaluation, coal bed gas resource evaluation and
Exploitation etc. related fieldss important parameter, therefore Accurate Determining coal seam gas-bearing capacity be ensure Safety of Coal Mine Production it is important before
It mentions.
The coal seam gas-bearing capacity measuring method that China generallys use at present is surveyed desorption method, indirect method and underground and is solved naturally with having
Suction method.It has been primarily present following deficiency:
(1) sample time is long, and gas loss amount is big in sampling process.Since gas loss amount is big, at the scene in desorption process, survey
The desorption of mash gas amount and desorption rate obtained is less than normal, causes gas bearing capacity measured value more much lower than actual value.This is not only affected pair
In the accuracy of coal mine gas vulnerable layer, and affect the reliability of the Gas Disaster control measure of subsequent selection.
(2) it is difficult to spot sampling.It is sampled using twist drill rods, it is serious to will cause sample mixing, and it is difficult to distinguish coal sample source；
Sampling room is set in hollow drill pipe and inverts drilling machine sampling, though can accomplish spot sampling, sampling amount is very little；Coring bit can
With spot sampling, and sampling amount is larger, but sample time is too long, necessarily affects the accuracy of coal seam gas-bearing capacity measurement.
Now in the device of research sampling below atmospheric pressure, domestic published patent document CN201310749625.3 discloses one
Kind negative pressure extraction-type coal seam gas-bearing capacity spot sampling method, easy to operate, sample time is short, but is taken under low temperature environment
Sample；Published patent document CN201410074595.5 discloses a kind of drilling negative pressure deslagging fixed point sampling of coal bed experiment system
System, the delivery situation of slack coal when the main underground coal mine sampling below atmospheric pressure by simulation, for the type selecting of sampling equipment and optimization provide according to
According to；Published patent document CN201811588701.6 discloses a kind of negative pressure low temperature coal seam gas-bearing capacity measurement sampling dress
It sets, injection liquid nitrogen cooling need to be continued, be not easy to adjust.
If taking coal sample at low ambient temperatures, the loss amount of gas in sampling process just can be reduced, improve coal-bed gas and contain
Measure fixed accuracy.To when underground coal mine carries out the operation such as fracturing to coal seam, liquid nitrogen is used sometimes.If liquid nitrogen is used for
The process of coal sample is taken in coal seam, then need continue injection liquid nitrogen cooling, it is structurally and operationally more complex accordingly, cost compared with
Height, and liquid nitrogen system will bring danger to neighbouring personnel once leakage phenomenon occurs.
Summary of the invention
The purpose of the present invention is to provide a kind of low-temperature negative-pressure coal sample coal seam gas-bearing capacity spot sampling systems, sample fast
Speed, without using liquid nitrogen cooling, good cooling results, operational safety height.
To achieve the above object, low-temperature negative-pressure coal sample coal seam gas-bearing capacity spot sampling system of the invention includes pneumatic drill
Machine, pneumatic drilling machine are equipped with hollow drill pipe, and the front end of hollow drill pipe is equipped with drill bit, and the linking part of hollow drill pipe and drill bit is equipped with
Wind path outlet；
It is characterized by also including there is air compressor, air compressor is connected with vortex cold wind mechanism, vortex by air supply tube
Cold wind mechanism is exported with total cold wind, and total cold wind outlet is connected with air duct, and air duct is connected with the inner cavity of hollow drill pipe；It bores
Coal seam wall at the point of hole is equipped with draught hood, and draught hood inner wall is connected with sliding sleeve by connecting rod, and hollow drill pipe, which passes through, to be slided
Dynamic casing is simultaneously slidably matched with sliding sleeve；It is surrounded between sliding sleeve and draught hood inner wall for the gas by carrying slack coal
The first annular cavity of stream；Air supply tube is equipped with blow valve；
Draught hood is connected with exhaust column, and exhaust column is connected with sampler, and sampler is connected with negative pressure pump by connecting tube.
The hollow drill pipe is equipped with air supply hole in the position of neighbouring pneumatic drilling machine, is covered on the hollow drill pipe at air supply hole
It for fan housing, is fixed by the bracket for fan housing on ground, is connected for fan housing by bearing and hollow drill pipe rotation；Air duct connection supplies
Fan housing and by being connected for fan housing and air supply hole with the inner cavity of hollow drill pipe.
The air supply hole is uniformly provided with 3-5 along the circumferential direction of hollow drill pipe.
Vortex cold wind mechanism includes several several vortex tubes being connected in parallel, and vortex tube has compressed air inlet, hot gas
Outlet and cold air outlet；The compressed air inlet of each vortex tube is connected with air supply tube respectively；The heat outlet of each vortex tube point
It is not connected by hot gas line with a hot air discharge mouth；The cold air outlet of each vortex tube passes through cooling pipelines and total cold wind respectively
Outlet is connected.
Sampler includes coal sample container, is equipped with transparent windows in the middle part of coal sample container, the area of section of coal sample container is
It is more than the three times of the area of section of exhaust column；Coal sample container is set in cabinet, and cabinet is supported in ground by support frame；
Coal sample container bottom is connected with downwards feeder pipe, and feeder pipe is equipped with discharge valve；One upper lateral part of coal sample container with it is described
Exhaust column is connected, and another upper lateral part of coal sample container is connected with connecting tube, and connecting tube is equipped with extraction valve and pressure gauge, even
The joint of adapter tube and coal sample container is equipped with filter screen.
The invention also discloses the samplings carried out using above-mentioned low-temperature negative-pressure coal sample coal seam gas-bearing capacity spot sampling system
Method sequentially includes the following steps:
First step is installation steps, installs low-temperature negative-pressure coal sample coal seam gas-bearing capacity spot sampling system in the coal seam position of selection
System；
Drill bit is pressed in the coal bed drilling point of selection, draught hood is mounted on the wall of coal seam；
Second step is drilling；Start pneumatic drilling machine, drills at boring point；It opens extraction valve and negative pressure pump, closing is unloaded
Expect valve；The aperture of drilling is greater than the outer diameter of hollow drill pipe, is formed between the inner wall of drilling and the outer wall of hollow drill pipe for passing through
Carry the second toroidal cavity of the air-flow of slack coal；
While drilling, blow valve and air compressor are opened, compressed air is entered in vortex cold wind mechanism by air supply tube
The compressed air inlet of each vortex tube, compressed air form thermal current and cold airflow when passing through vortex tube, and thermal current passes through heat
It is drained into atmosphere after air pipe and hot air discharge mouth, cold airflow passes through cooling pipelines, the outlet of total cold wind, air duct, hollow brill
Bar and wind path outlet enter the second toroidal cavity；
After cold airflow enters the second toroidal cavity, under the action of cold airflow pressure itself and negative pressure, in the second toroidal cavity
The middle first annular cavity for carrying the slack coal formed when drilling and entering in draught hood, then enters coal sample container through exhaust column；It is cold
Air-flow is the three times of the area of section of exhaust column or more due to the area of section of coal sample container when passing through coal sample container,
The speed of cold airflow reduces, and slack coal is deposited in coal sample container；Cold airflow enters connecting tube after passing through filter screen and by negative pressure pump
Discharge；
Third step is sampling；After drilling reaches scheduled depth selection, pneumatic drilling machine, air compressor and negative pressure are first closed
Pump, then opens discharge valve, and the coal sample in coal sample container is discharged, and is then shut off discharge valve, starting pneumatic drilling machine, air compression
The slack coal of predetermined drilling depth is carried into coal sample container and is accumulated by machine and negative pressure pump, path of the cold airflow in second step；
Four steps is off sampling；During third step carries out, staff observes coal sample by transparent windows
Accumulate after highly reaching predetermined altitude, closes pneumatic drilling machine, air compressor and negative pressure pump, external coal sample tank is placed on blanking
Immediately below pipe, discharge valve is opened, falls into coal sample in coal sample tank, completes sampling.
The present invention has the advantage that:
The present invention realizes low temperature sampling using the cold air that vortex tube generates, and refrigerating capacity is big, it is rapid to produce cold air, and can pass through vortex
Regulating valve at the heat outlet of pipe is realized and is quickly adjusted, and is generated cooling process without moving component, is not necessarily to additional refrigeration source；
Negative pressure extracting coal sample is generated using negative pressure pump, sample time is shortened, reduces gas loss amount.The present invention effectively increases coal
The accuracy of layer gas bearing capacity measurement, and equipment safety is reliable, easy to maintain, is easy to implement spot sampling, and when sampling conveniently keeps away
Exempt from sample mixing phenomenon.
The setting of several vortex tube parallel connections improves the ability that the present invention generates cold airflow.
The configuration of the present invention is simple, cold front heavy rain drill bit, the hollow drill pipe generated by vortex cold wind mechanism in boring procedure
And slack coal, cooling velocity is fast, cooling efficiency is high, without to underground transportation liquid nitrogen, will not cause danger because liquid nitrogen is revealed, both
Safe coefficient is improved, structure is in turn simplified, improves installation speed and job stability.
The negative pressure that the present invention is generated using the positive pressure of cold airflow and negative pressure pump drives drilling slack coal to enter jointly as power
Coal sample container, slack coal transfer efficiency is high, can take out slack coal low temperature while drilling, substantially increase sample rate, both
It avoids room temperature sampling from causing gas release in slack coal excessive, and sample time length is avoided to cause gas release in slack coal excessive, greatly
The primitiveness of gas bearing capacity in coal sample is improved greatly, has taken into account that sample time is short and larger two targets of sampling amount, is coal sample watt
This parsing experiment provides the coal sample closer to coal seam actual conditions, improves the order of accuarcy of coal seam gas-bearing capacity measurement.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention；
Fig. 2 is the enlarged drawing in Fig. 1 at A；
Fig. 3 is the structural schematic diagram that cold wind mechanism is vortexed in Fig. 1；
Fig. 4 is the structural schematic diagram of sampler in Fig. 1.
Specific embodiment
As shown in Figures 1 to 4, low-temperature negative-pressure coal sample coal seam gas-bearing capacity spot sampling system of the invention includes pneumatic drill
Machine 1, pneumatic drilling machine 1 are equipped with hollow drill pipe 2, and the front end of hollow drill pipe 2 is equipped with drill bit 3, the phase of hollow drill pipe 2 and drill bit 3
Socket part be radially equipped with wind path outlet, wind path outlet hollow drill pipe it is inside and outside；Wind path outlet is through-hole structure, figure
Do not show.
It further include having air compressor 4, air compressor 4 is connected with vortex cold wind mechanism 6 by air supply tube 5, is vortexed cold
Blower structure 6 has total cold wind outlet 7, and total cold wind outlet 7 is connected with air duct 8, and air duct 8 is connected with the inner cavity of hollow drill pipe 2
It is logical；Coal seam wall 33 at boring point is equipped with draught hood 9, and 9 inner wall of draught hood is connected with sliding sleeve 11 by connecting rod 10, in
Empty drilling rod 2 passes through sliding sleeve 11 and is slidably matched with sliding sleeve 11；Use is surrounded between 9 inner wall of sliding sleeve 11 and draught hood
In the first annular cavity 12 of the air-flow by carrying slack coal；Air supply tube 5 is equipped with blow valve 13；
Draught hood 9 is connected with exhaust column 14, and exhaust column 14 is connected with sampler, and sampler is connected with negative by connecting tube 15
Press pump 16.Sealing leather packing is equipped at bearing at draught hood 9.
The hollow drill pipe 2 is equipped with air supply hole 17 in the position of neighbouring pneumatic drilling machine 1, on the hollow drill pipe at air supply hole 17
It is covered with for fan housing 18, is fixed by the bracket for fan housing 18 on ground, connected for fan housing 18 by bearing and the rotation of hollow drill pipe 2
It connects；Air duct 8 is connected for fan housing 18 and by being connected for fan housing 18 and air supply hole 17 with the inner cavity of hollow drill pipe 2.For fan housing
Sealing leather packing is equipped at bearing between 18 and hollow drill pipe 2.Bearing, bracket and sealing leather packing are routine techniques, not shown.
It includes endpoints thereof that the air supply hole 17, which is uniformly provided with 3-5(along the circumferential direction of hollow drill pipe) it is a.
Being vortexed cold wind mechanism 6 includes several several vortex tubes 19 being connected in parallel, and vortex tube 19 has compressed air inlet
20, heat outlet 21 and cold air outlet 22；The compressed air inlet 20 of each vortex tube 19 is connected with air supply tube 5 respectively；Each whirlpool
The heat outlet 21 of flow tube 19 is connected by hot gas line 23 with a hot air discharge mouth 24 respectively；The cold air of each vortex tube 19 goes out
Mouth 22 is connected by cooling pipelines 35 with total cold wind outlet 7 respectively.Regulating valve is equipped at the heat outlet 21 of vortex tube 19.Whirlpool
Flow tube 19 is existing apparatus, and specific structure is no longer described in detail, regulating valve not shown.The setting in parallel of several vortex tubes 19 improves this
Invention generates the ability of cold airflow.
Sampler includes coal sample container 25, is equipped with transparent windows 26 in the middle part of coal sample container 25, big on coal sample container 25
Under it is small (funnel-shaped), the averga cross section area (area of figure middle finger vertical cross-section) of coal sample container 25 is the section of exhaust column 14
It is more than the three times of area；Coal sample container 25 is set in cabinet 27, and cabinet 27 is supported in ground by support frame；
25 bottom of coal sample container is connected with downwards feeder pipe 28, and feeder pipe 28 is equipped with discharge valve 29；The side of coal sample container 25
Top is connected with the exhaust column 14, and another upper lateral part of coal sample container 25 is connected with connecting tube 15, sets in connecting tube 15
There are extraction valve 30 and pressure gauge 31, connecting tube 15 and the joint of coal sample container 25 are equipped with filter screen.Filter screen is conventional equipment,
It is not shown.
The invention also discloses the samplings carried out using above-mentioned low-temperature negative-pressure coal sample coal seam gas-bearing capacity spot sampling system
Method sequentially includes the following steps:
First step is installation steps, installs low-temperature negative-pressure coal sample coal seam gas-bearing capacity spot sampling system in the coal seam position of selection
System；
Drill bit 3 is connected with hollow drill pipe 2, hollow drill pipe 2 is connect by air duct 8 with vortex cold wind mechanism 6, by drill bit
3 are pressed in the coal bed drilling point of selection, and draught hood 9 is mounted on coal seam wall 33；
Second step is drilling；Start pneumatic drilling machine 1, drills at boring point；Extraction valve 30 and negative pressure pump 16 are opened, is closed
Close discharge valve 29；The aperture of drilling is greater than the outer diameter of hollow drill pipe 2, is formed between the inner wall of drilling and the outer wall of hollow drill pipe 2
The second toroidal cavity 34 for the air-flow by carrying slack coal；
While drilling, blow valve 13 and air compressor 4 are opened, compressed air enters vortex cold wind mechanism 6 by air supply tube 5
In each vortex tube 19 compressed air inlet 20, compressed air forms thermal current and cold airflow, heat when passing through vortex tube 19
By draining into atmosphere after hot gas line 23 and hot air discharge mouth 24, cold airflow is gone out air-flow by cooling pipelines 35, total cold wind
Mouth 7, air duct 8, hollow drill pipe 2 and wind path outlet enter the second toroidal cavity 34；
It is empty in the second annular under the action of cold airflow pressure itself and negative pressure after cold airflow enters the second toroidal cavity 34
The slack coal formed when carrying drilling in chamber 34 enters the first annular cavity 12 in draught hood 9, then enters coal through exhaust column 14
Sample container 25；Cold airflow is when passing through coal sample container 25, since the area of section of coal sample container 25 is the section face of exhaust column 14
More than long-pending three times, therefore the speed of cold airflow reduces, and slack coal is deposited in coal sample container 25；Cold airflow is laggard by filter screen
Enter connecting tube 15 and is discharged by negative pressure pump 16；
Third step is sampling；After drilling reaches scheduled depth selection, first closes pneumatic drilling machine 1, air compressor 4 and bear
Then press pump 16 opens discharge valve 29, the coal sample in coal sample container 25 is discharged, and is then shut off discharge valve 29, starts pneumatic drill
Machine 1, air compressor 4 and negative pressure pump 16, path of the cold airflow in second step by the slack coal of predetermined drilling depth carry into
Coal sample container 25 simultaneously accumulates；
Four steps is off sampling；During third step carries out, staff observes coal by transparent windows 26
After sample accumulation height reaches predetermined altitude, pneumatic drilling machine 1, air compressor 4 and negative pressure pump 16 are closed, external coal sample tank is put
Immediately below feeder pipe 28, discharge valve 29 is opened, falls into coal sample in coal sample tank, completes sampling.
After the completion of sampling, low-temperature negative-pressure coal sample coal seam gas-bearing capacity spot sampling system is removed at coal seam wall 33.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that: still the present invention can be modified or be waited
With replacement, without departing from the spirit or scope of the invention, or any substitutions, should all cover in power of the invention
In sharp claimed range.
Claims (6)
1. low-temperature negative-pressure coal sample coal seam gas-bearing capacity spot sampling system, including pneumatic drilling machine, pneumatic drilling machine are equipped with hollow brill
Bar, the front end of hollow drill pipe are equipped with drill bit, and the linking part of hollow drill pipe and drill bit is exported equipped with wind path；
It is characterized by also including there is air compressor, air compressor is connected with vortex cold wind mechanism, vortex by air supply tube
Cold wind mechanism is exported with total cold wind, and total cold wind outlet is connected with air duct, and air duct is connected with the inner cavity of hollow drill pipe；It bores
Coal seam wall at the point of hole is equipped with draught hood, and draught hood inner wall is connected with sliding sleeve by connecting rod, and hollow drill pipe, which passes through, to be slided
Dynamic casing is simultaneously slidably matched with sliding sleeve；It is surrounded between sliding sleeve and draught hood inner wall for the gas by carrying slack coal
The first annular cavity of stream；Air supply tube is equipped with blow valve；
Draught hood is connected with exhaust column, and exhaust column is connected with sampler, and sampler is connected with negative pressure pump by connecting tube.
2. low-temperature negative-pressure coal sample coal seam gas-bearing capacity spot sampling system according to claim 1, it is characterised in that: described
Hollow drill pipe is equipped with air supply hole in the position of neighbouring pneumatic drilling machine, is covered with air feed cover, air feed on the hollow drill pipe at air supply hole
Cover is fixed by the bracket on ground, is connected for fan housing by bearing and hollow drill pipe rotation；Air duct connection is for fan housing and passes through
It is connected for fan housing and air supply hole with the inner cavity of hollow drill pipe.
3. low-temperature negative-pressure coal sample coal seam gas-bearing capacity spot sampling system according to claim 2, it is characterised in that: described
Air supply hole is uniformly provided with 3-5 along the circumferential direction of hollow drill pipe.
4. low-temperature negative-pressure coal sample coal seam gas-bearing capacity spot sampling system according to any one of claim 1 to 3, special
Sign is: vortex cold wind mechanism includes several several vortex tubes being connected in parallel, and there is vortex tube compressed air inlet, hot gas to go out
Mouth and cold air outlet；The compressed air inlet of each vortex tube is connected with air supply tube respectively；The heat outlet of each vortex tube is distinguished
It is connected by hot gas line with a hot air discharge mouth；The cold air outlet of each vortex tube passes through cooling pipelines respectively and goes out with total cold wind
Mouth is connected.
5. low-temperature negative-pressure coal sample coal seam gas-bearing capacity spot sampling system according to claim 4, it is characterised in that: sampling
Device includes coal sample container, is equipped with transparent windows in the middle part of coal sample container, the area of section of coal sample container is the section of exhaust column
It is more than the three times of area；Coal sample container is set in cabinet, and cabinet is supported in ground by support frame；
Coal sample container bottom is connected with downwards feeder pipe, and feeder pipe is equipped with discharge valve；One upper lateral part of coal sample container with it is described
Exhaust column is connected, and another upper lateral part of coal sample container is connected with connecting tube, and connecting tube is equipped with extraction valve and pressure gauge, even
The joint of adapter tube and coal sample container is equipped with filter screen.
6. the sampling method carried out using the low-temperature negative-pressure coal sample coal seam gas-bearing capacity spot sampling system described in claim 5,
It is characterized in that sequentially including the following steps:
First step is installation steps, installs low-temperature negative-pressure coal sample coal seam gas-bearing capacity spot sampling system in the coal seam position of selection
System；
Drill bit is pressed in the coal bed drilling point of selection, draught hood is mounted on the wall of coal seam；
Second step is drilling；Start pneumatic drilling machine, drills at boring point；It opens extraction valve and negative pressure pump, closing is unloaded
Expect valve；The aperture of drilling is greater than the outer diameter of hollow drill pipe, is formed between the inner wall of drilling and the outer wall of hollow drill pipe for passing through
Carry the second toroidal cavity of the air-flow of slack coal；
While drilling, blow valve and air compressor are opened, compressed air is entered in vortex cold wind mechanism by air supply tube
The compressed air inlet of each vortex tube, compressed air form thermal current and cold airflow when passing through vortex tube, and thermal current passes through heat
It is drained into atmosphere after air pipe and hot air discharge mouth, cold airflow passes through cooling pipelines, the outlet of total cold wind, air duct, hollow brill
Bar and wind path outlet enter the second toroidal cavity；
After cold airflow enters the second toroidal cavity, under the action of cold airflow pressure itself and negative pressure, in the second toroidal cavity
The middle first annular cavity for carrying the slack coal formed when drilling and entering in draught hood, then enters coal sample container through exhaust column；It is cold
Air-flow is the three times of the area of section of exhaust column or more due to the area of section of coal sample container when passing through coal sample container,
The speed of cold airflow reduces, and slack coal is deposited in coal sample container；Cold airflow enters connecting tube after passing through filter screen and by negative pressure pump
Discharge；
Third step is sampling；After drilling reaches scheduled depth selection, pneumatic drilling machine, air compressor and negative pressure are first closed
Pump, then opens discharge valve, and the coal sample in coal sample container is discharged, and is then shut off discharge valve, starting pneumatic drilling machine, air compression
The slack coal of predetermined drilling depth is carried into coal sample container and is accumulated by machine and negative pressure pump, path of the cold airflow in second step；
Four steps is off sampling；During third step carries out, staff observes coal sample by transparent windows
Accumulate after highly reaching predetermined altitude, closes pneumatic drilling machine, air compressor and negative pressure pump, external coal sample tank is placed on blanking
Immediately below pipe, discharge valve is opened, falls into coal sample in coal sample tank, completes sampling.
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| CN201910398751.6A CN110031255B (en) | 2019-05-14 | 2019-05-14 | Low-temperature negative pressure coal sample coal bed gas content fixed-point sampling system and sampling method |
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| CN201910398751.6A CN110031255B (en) | 2019-05-14 | 2019-05-14 | Low-temperature negative pressure coal sample coal bed gas content fixed-point sampling system and sampling method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110608928A (en) * | 2019-10-18 | 2019-12-24 | 重庆工程职业技术学院 | Gas collection system for coal mining |
| CN111042812A (en) * | 2020-01-13 | 2020-04-21 | 煤科集团沈阳研究院有限公司 | Underground fixed-point sampling device and method |
| CN111649979A (en) * | 2020-06-12 | 2020-09-11 | 煤科集团沈阳研究院有限公司 | Nitrogen low-temperature positive-pressure remote rapid gas content sampling device and method |
| CN113123822A (en) * | 2021-04-20 | 2021-07-16 | 焦作煤业（集团）新乡能源有限公司 | Regional coal receiving device that verifies of high mining height stope face |
| CN114235480A (en) * | 2021-12-21 | 2022-03-25 | 上海应用技术大学 | Coal seam gas content negative pressure fixed point sampling method |
| CN114592905A (en) * | 2022-04-27 | 2022-06-07 | 中国矿业大学 | Low-negative-pressure ejection deep hole continuous sampling system and sampling method |
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