CN208937113U - Low flow velocity methane gas extraction pipeline flow rate-measuring device is detected using dilution air - Google Patents
Low flow velocity methane gas extraction pipeline flow rate-measuring device is detected using dilution air Download PDFInfo
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- CN208937113U CN208937113U CN201821983746.9U CN201821983746U CN208937113U CN 208937113 U CN208937113 U CN 208937113U CN 201821983746 U CN201821983746 U CN 201821983746U CN 208937113 U CN208937113 U CN 208937113U
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 89
- 238000000605 extraction Methods 0.000 title claims abstract description 77
- 238000010790 dilution Methods 0.000 title claims abstract description 32
- 239000012895 dilution Substances 0.000 title claims abstract description 32
- 238000007789 sealing Methods 0.000 claims abstract description 23
- 239000007921 spray Substances 0.000 claims description 16
- 238000010276 construction Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 29
- 238000001514 detection method Methods 0.000 abstract description 11
- 239000003245 coal Substances 0.000 abstract description 9
- 238000005553 drilling Methods 0.000 abstract description 4
- 230000002265 prevention Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000002156 mixing Methods 0.000 description 14
- 238000010586 diagram Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 238000012360 testing method Methods 0.000 description 5
- 238000011144 upstream manufacturing Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
Low flow velocity methane gas extraction pipeline flow rate-measuring device is detected using dilution air, it is related to coal mine gas drainage technical field.It includes main body, nozzle, gas cap, nozzle connection sealing cover, connector, flange, the second gas nozzle, the first gas nozzle, nozzle connection, third gas nozzle, the main body inlet end, outlet side are provided with flange, and main body is disposed with the second gas nozzle, the first gas nozzle, nozzle connection, third gas nozzle from inlet end to outlet side；The diameter of the main body is equal to the diameter of extraction pipeline, and main body inlet end, outlet side pass through flanged joint with extraction pipeline.After by adopting the above technical scheme, the utility model has the beneficial effect that detection device measurement accuracy is high, accuracy is good, realize the accurate measurement of low flow velocity methane gas extraction pipeline flow, it can be used in the extraction systems such as drilling, drill site end flow detection, facilitate the accurate metering of gas drainage amount, the accuracy for improving gas drainage judge up to standard, is of great significance for mine gas prevention and control.
Description
Technical field
The present invention relates to coal mine gas drainage technical fields, and in particular to detects low flow velocity gas drainage using dilution air
Piping flow measurement device.
Background technique
Gas drainage is one of most important Firedamp precaution measures of China's coal-mine.Accurate Determining negative pressure, concentration, flow, temperature
The methane gas extraction pipelines parameter such as degree, humidity, the accurate metering for gas drainage amount, extraction accurate judge up to standard ensure coal mine
Safety etc. is of great significance.By years development, at present the instrument and equipment of colliery scene have been realized in negative pressure, concentration,
The parameters such as temperature, humidity more accurately measure, but the detection of flow parameter is not solved effectively but, however it remains very
Big problem.At this stage, coal mine gas extraction pipeline flow detection mainly uses orifice flowmeter, pitot tube flowmeter, V
The methods of cone flow meter, vortex-shedding meter, the problem that measurement accuracy is low, accuracy is poor under the conditions of generally existing low flow velocity, cannot
Meet the needs of the gas extraction flow metering of the small traffic environments such as colliery scene drilling, drill site.Therefore, low flow velocity gas drainage
The measurement of piping flow parameter is always one of coal mine gas drainage parameter detecting, the technical problem of metering aspect.
Summary of the invention
In view of the defects and deficiencies of the prior art, the present invention intends to provide detect low flow velocity watt using dilution air
This extraction pipeline flow rate-measuring device by blending a certain amount of air into extraction pipeline, and detects dilution air front and back watt
The variation of this concentration, realizes the accurate measurement of low flow velocity methane gas extraction pipeline gas flow, has for mine gas prevention and control important
Meaning.
To achieve the above object, the present invention is using following technical scheme: it includes main body 1, nozzle 2, gas cap 3, nozzle
Joint sealing lid 4, connector 5, flange 11, the second gas nozzle 12, the first gas nozzle 13, nozzle connection 14, third gas nozzle 15, the master
1 inlet end of body, outlet side are provided with flange 11, and main body 1 is disposed with the second gas nozzle 12, first from inlet end to outlet side
Gas nozzle 13, nozzle connection 14, third gas nozzle 15；
The diameter of the main body 1 is equal to the diameter of extraction pipeline, and 1 inlet end of main body, outlet side are logical with extraction pipeline
Cross the connection of flange 11；
Gas cap 3 is provided on second gas nozzle 12, third gas nozzle 15；
First gas nozzle 13 is connect with barometer；
Connector 5 is provided on the nozzle connection 14, connector 5 includes one in nozzle 2 or nozzle connection sealing cover 4
Kind.
The nozzle connection 14 and 13 spacing of the first gas nozzle are not less than 2 times of 1 internal diameter of main body, nozzle connection 14 and third gas
15 spacing of mouth is not less than 4 times of 1 internal diameter of main body.
The nozzle 2 is series standard part.
14 inner wall of nozzle connection is provided with internal screw thread.
The contour structures of the nozzle 2 are the combining form of hexagonal prisms and cylinder, and 2 top of nozzle is short hexagonal prisms, nozzle 2
Lower part is cylinder, and both short hexagonal prisms, cylinder are coaxial, and centre is spray orifice, and cylindrical outer side is provided with screw thread.
The gas cap 3 is rubber cap.
4 shape of nozzle connection sealing cover is identical as nozzle 2, does not have spray orifice, and nozzle among nozzle connection sealing cover 4
Joint sealing lid 4 is solid construction, cylindrical outer side is provided with screw thread.
The working principle of the invention: 1 inlet end of main body, outlet side are provided with flange 11, and main body 1 is from inlet end to outlet
End is disposed with the second gas nozzle 12, the first gas nozzle 13, nozzle connection 14, third gas nozzle 15；The diameter of the main body 1, which is equal to, to be taken out
The diameter of pipeline is adopted, and 1 inlet end of main body, outlet side are connect with extraction pipeline by flange 11；Second gas nozzle 12,
Gas cap 3 is provided on three gas nozzles 15；Second gas nozzle 12 is used to acquire the extraction pipeline gas sample of the non-dilution air in upstream, and measurement is not
The pipeline gas density of dilution air, third gas nozzle 15 for acquiring the extraction pipeline gas sample after the dilution air of downstream, mix by measurement
Pipeline gas density after mixed air is provided with gas cap 3 on the second gas nozzle 12, third gas nozzle 15, in non-methane gas extraction pipeline stream
The second gas nozzle 12, third gas nozzle 15 are blocked between measuring periodically；First gas nozzle 13 is connect with barometer；First gas nozzle 13 and gas
Pressure meter connection measurement pipeline extraction negative pressure；Connector 5 is provided on the nozzle connection 14, connector 5 includes nozzle 2 or nozzle
One of joint sealing lid 4.During methane gas extraction pipeline flow measurement, nozzle 2 is provided on nozzle connection 14, to master
1 internal spray air of body realizes the blending of air and extraction pipeline methane gas in 1 space of main body；In non-gas drainage pipe
During the flow measurement of road, it is provided with nozzle connection sealing cover 4 on nozzle connection 14 and blocks nozzle connection 14, air intake installation spray
Mouth 2 improves the blending efficiency of air, shortens blending distance, it is ensured that being sufficiently mixed for air and pipeline gas ensure that
The accuracy of testing result；Nozzle 2 uses series standard part, is quickly calculated and is blended according to negative pressure-discharge relation of nozzle 2
Air mass flow, fully considered the complexity and variability of coal mine gas extraction, it is ensured that the convenience of this method and
Extensive adaptability can be used in the Accurate Determining of the low flow velocity methane gas extraction pipeline flow under different condition.
After adopting the above technical scheme, passing through the invention has the following beneficial effects: detection device measurement accuracy is high, accuracy is good
A certain amount of air is blended to gas pumping pipeline, the variation feelings of gas density in the methane gas extraction pipeline of measurement dilution air front and back
Condition realizes the accurate measurement of low flow velocity methane gas extraction pipeline flow, can be used in the extraction systems such as drilling, drill site end flow
Detection facilitates the accurate metering of gas drainage amount, the accuracy of gas drainage judge up to standard is improved, for mine gas prevention and control
It is of great significance.
The blending efficiency for improving air, shortens blending distance, it is ensured that air and pipeline gas are sufficiently mixed, and are protected
The accuracy of testing result is demonstrate,proved；The complexity and variability of coal mine gas extraction are fully considered, it is ensured that this method
Convenience and extensive adaptability, can be used in the Accurate Determining of the low flow velocity methane gas extraction pipeline flow under different condition.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other drawings based on these drawings.
Fig. 1 is structural schematic diagram of the invention；
Fig. 2 is the structural schematic diagram of nozzle 2 in the present invention；
Fig. 3 is the top view of corresponding diagram 2；
Fig. 4 is the structural schematic diagram of gas cap 3 in the present invention；
Fig. 5 is the top view of corresponding diagram 4；
Fig. 6 is the structural schematic diagram of nozzle connection sealing cover 4 in the present invention；
Fig. 7 is the top view of corresponding diagram 6；
Fig. 8 is the structural schematic diagram of connector 5 in the present invention；
Fig. 9 is step schematic block diagram of the invention.
Description of symbols: main body 1, nozzle 2, gas cap 3, nozzle connection sealing cover 4, connector 5, flange 11, the second gas
Mouth 12, the first gas nozzle 13, nozzle connection 14, third gas nozzle 15.
Specific embodiment
Referring to shown in Fig. 1-Fig. 9, present embodiment the technical solution adopted is that:
Low flow velocity methane gas extraction pipeline flow rate-measuring device is detected using dilution air, it includes main body 1, nozzle 2, gas cap
3, nozzle connection sealing cover 4, connector 5, flange 11, the second gas nozzle 12, the first gas nozzle 13, nozzle connection 14, third gas nozzle 15,
1 inlet end of main body, outlet side are provided with flange 11, and main body 1 is disposed with the second gas nozzle from inlet end to outlet side
12, the first gas nozzle 13, nozzle connection 14, third gas nozzle 15；
The diameter of the main body 1 is equal to the diameter of extraction pipeline, and 1 inlet end of main body, outlet side are logical with extraction pipeline
Cross the connection of flange 11；
Gas cap 3 is provided on second gas nozzle 12, third gas nozzle 15；Second gas nozzle 12 does not blend for acquiring upstream
The extraction pipeline gas sample of air, measures the pipeline gas density of non-dilution air, and third gas nozzle 15 is empty for acquiring downstream blending
Extraction pipeline gas sample after gas measures pipeline gas density after dilution air, is provided on the second gas nozzle 12, third gas nozzle 15
Gas cap 3 blocks the second gas nozzle 12, third gas nozzle 15 during non-methane gas extraction pipeline flow measurement；
First gas nozzle 13 is connect with barometer；First gas nozzle 13 connect measurement pipeline extraction negative pressure with barometer；
Connector 5 is provided on the nozzle connection 14, connector 5 includes one in nozzle 2 or nozzle connection sealing cover 4
Kind.During methane gas extraction pipeline flow measurement, nozzle 2 is provided on nozzle connection 14, to 1 internal spray air of main body,
The blending of air and extraction pipeline methane gas is realized in 1 space of main body；During non-methane gas extraction pipeline flow measurement, spray
It is provided with nozzle connection sealing cover 4 on mouth connector 14 and blocks nozzle connection 14.
The nozzle connection 14 and 13 spacing of the first gas nozzle are not less than 2 times of 1 internal diameter of main body, nozzle connection 14 and third gas
15 spacing of mouth is not less than 4 times of 1 internal diameter of main body.
The nozzle 2 is series standard part.Nozzle 2 is divided into multiple series according to structure difference, and each series is according to nozzle 2
Diameter and spray orifice are of different sizes comprising multiple models, and the discharge coefficient μ of each model nozzle 2 is obtained in laboratory testing.
14 inner wall of nozzle connection is provided with internal screw thread.
The contour structures of the nozzle 2 are the combining form of hexagonal prisms and cylinder, and 2 top of nozzle is short hexagonal prisms, nozzle 2
Lower part is cylinder, and both short hexagonal prisms, cylinder are coaxial, and centre is spray orifice, and cylindrical outer side is provided with screw thread.
The gas cap 3 is rubber cap.
4 shape of nozzle connection sealing cover is identical as nozzle 2, does not have spray orifice, and nozzle among nozzle connection sealing cover 4
Joint sealing lid 4 is solid construction, cylindrical outer side is provided with screw thread.
Dilution air detects the measuring method of low flow velocity methane gas extraction pipeline flow, it is comprised the following steps:
Step S1: installation detects low flow velocity methane gas extraction pipeline flow using dilution air in tested methane gas extraction pipeline
Measurement device；
Step S2: the gas density in measurement methane gas extraction pipeline local environment air；
Step S3: by barometer and using the first of dilution air detection low flow velocity methane gas extraction pipeline flow rate-measuring device
Gas nozzle 13 connects, and measures the operating condition negative pressure of methane gas extraction pipeline；
Step S4: it selects the nozzle 2 of suitable types to be installed on and low flow velocity methane gas extraction pipeline stream is detected using dilution air
On the nozzle connection 14 of amount determining device, air is sprayed into pipeline, and calculates acquisition negative pressureThe injection flow of lower nozzle 2,
Calculation formula is as follows:
Wherein:For the discharge coefficient of nozzle 2, after determining 2 model of nozzleFor fixed value；
Step S5: by using the second gas nozzle 12 of dilution air detection low flow velocity methane gas extraction pipeline flow rate-measuring device
The gas sample of gas in methane gas extraction pipeline is acquired, the gas density of the pipeline gas of non-dilution air in upstream is measured；
Step S6: by using the third gas nozzle 15 of dilution air detection low flow velocity methane gas extraction pipeline flow rate-measuring device
Gas sample is acquired, the gas density of the pipeline gas in downstream pipe after dilution air is measured；
Step S7: the mixed traffic for obtaining gas in methane gas extraction pipeline under operating condition is calculated:
。
Choosing whether for 2 model of nozzle is suitable, determination method are as follows: nozzle 2 is to line upstream extraction negative pressure's
It influences within ± 10%, it is believed that 2 model of nozzle is suitable, otherwise it is assumed that improper.
The working principle of the invention: 1 inlet end of main body, outlet side are provided with flange 11, and main body 1 is from inlet end to outlet
End is disposed with the second gas nozzle 12, the first gas nozzle 13, nozzle connection 14, third gas nozzle 15；The diameter of the main body 1, which is equal to, to be taken out
The diameter of pipeline is adopted, and 1 inlet end of main body, outlet side are connect with extraction pipeline by flange 11；Second gas nozzle 12,
Gas cap 3 is provided on three gas nozzles 15；Second gas nozzle 12 is used to acquire the extraction pipeline gas sample of the non-dilution air in upstream, and measurement is not
The pipeline gas density of dilution air, third gas nozzle 15 for acquiring the extraction pipeline gas sample after the dilution air of downstream, mix by measurement
Pipeline gas density after mixed air is provided with gas cap 3 on the second gas nozzle 12, third gas nozzle 15, in non-methane gas extraction pipeline stream
The second gas nozzle 12, third gas nozzle 15 are blocked between measuring periodically；First gas nozzle 13 is connect with barometer；First gas nozzle 13 and gas
Pressure meter connection measurement pipeline extraction negative pressure；Connector 5 is provided on the nozzle connection 14, connector 5 includes nozzle 2 or nozzle
One of joint sealing lid 4.During methane gas extraction pipeline flow measurement, nozzle 2 is provided on nozzle connection 14, to master
1 internal spray air of body realizes the blending of air and extraction pipeline methane gas in 1 space of main body；In non-gas drainage pipe
During the flow measurement of road, it is provided with nozzle connection sealing cover 4 on nozzle connection 14 and blocks nozzle connection 14, air intake installation spray
Mouth 2 improves the blending efficiency of air, shortens blending distance, it is ensured that being sufficiently mixed for air and pipeline gas ensure that
The accuracy of testing result；Nozzle 2 uses series standard part, is quickly calculated and is blended according to negative pressure-discharge relation of nozzle 2
Air mass flow, fully considered the complexity and variability of coal mine gas extraction, it is ensured that the convenience of this method and
Extensive adaptability can be used in the Accurate Determining of the low flow velocity methane gas extraction pipeline flow under different condition.
Illustrative example is illustrated: for example, being divided into cylindrical nozzle, conical nozzle, Venturi nozzle etc. according to structure difference
Multiple series, each series include multiple models, and the nozzle diameter and spray orifice of different model nozzle are of different sizes, nozzle diameter
Including 4 points, 6 points, 1 cun, 1.5 cun, 2 cun, 2.5 cun, 3 cun, 4 cun of equal-specifications, injection diameter include 4mm, 6mm, 8mm, 10mm,
15mm, 20mm, 30mm, 40mm, 50mm equal-specification.The nozzle of different-diameter can satisfy the requirement of different extraction pipeline sizes,
Different spray orifice sizes can satisfy the requirement of different air blending amounts, so that this method has very strong live adaptability, it can
Realize the measurement of the low flow velocity methane gas extraction pipeline flow under different condition.
After adopting the above technical scheme, passing through the invention has the following beneficial effects: detection device measurement accuracy is high, accuracy is good
A certain amount of air is blended to gas pumping pipeline, the variation feelings of gas density in the methane gas extraction pipeline of measurement dilution air front and back
Condition realizes the accurate measurement of low flow velocity methane gas extraction pipeline flow, can be used in the extraction systems such as drilling, drill site end flow
Detection facilitates the accurate metering of gas drainage amount, the accuracy of gas drainage judge up to standard is improved, for mine gas prevention and control
It is of great significance.
The blending efficiency for improving air, shortens blending distance, it is ensured that air and pipeline gas are sufficiently mixed, and are protected
The accuracy of testing result is demonstrate,proved；The complexity and variability of coal mine gas extraction are fully considered, it is ensured that this method
Convenience and extensive adaptability, can be used in the Accurate Determining of the low flow velocity methane gas extraction pipeline flow under different condition.
The above is only used to illustrate the technical scheme of the present invention and not to limit it, and those of ordinary skill in the art are to this hair
The other modifications or equivalent replacement that bright technical solution is made, as long as it does not depart from the spirit and scope of the technical scheme of the present invention,
It is intended to be within the scope of the claims of the invention.
Claims (7)
1. detecting low flow velocity methane gas extraction pipeline flow rate-measuring device using dilution air, it is characterised in that: it includes main body
(1), nozzle (2), gas cap (3), nozzle connection sealing cover (4), connector (5), flange (11), the second gas nozzle (12), the first gas
Mouth (13), nozzle connection (14), third gas nozzle (15), main body (1) inlet end, outlet side are provided with flange (11), main
Body (1) is disposed with the second gas nozzle (12), the first gas nozzle (13), nozzle connection (14), third gas from inlet end to outlet side
Mouth (15)；
The diameter of the main body (1) is equal to the diameter of extraction pipeline, and main body (1) inlet end, outlet side are logical with extraction pipeline
Cross flange (11) connection；
Gas cap (3) are provided on second gas nozzle (12), third gas nozzle (15)；
First gas nozzle (13) connect with barometer；
It is provided with connector (5) on the nozzle connection (14), connector (5) includes nozzle (2) or nozzle connection sealing cover (4)
One of.
2. according to claim 1 detect low flow velocity methane gas extraction pipeline flow rate-measuring device using dilution air, special
Sign is: main body (1) internal diameter of the nozzle connection (14) and the first gas nozzle (13) spacing not less than 2 times, nozzle connection (14)
It is not less than 4 times main body (1) internal diameter with third gas nozzle (15) spacing.
3. according to claim 1 detect low flow velocity methane gas extraction pipeline flow rate-measuring device using dilution air, special
Sign is: the nozzle (2) is series standard part.
4. according to claim 1 detect low flow velocity methane gas extraction pipeline flow rate-measuring device using dilution air, special
Sign is: nozzle connection (14) inner wall is provided with internal screw thread.
5. according to claim 1 detect low flow velocity methane gas extraction pipeline flow rate-measuring device using dilution air, special
Sign is: the contour structures of the nozzle (2) are the combining form of hexagonal prisms and cylinder, and nozzle (2) top is short hexagonal prisms, spray
Mouth (2) lower part is cylinder, and both short hexagonal prisms, cylinder are coaxial, and centre is spray orifice, and cylindrical outer side is provided with screw thread.
6. according to claim 1 detect low flow velocity methane gas extraction pipeline flow rate-measuring device using dilution air, special
Sign is: the gas cap (3) is rubber cap.
7. according to claim 1 detect low flow velocity methane gas extraction pipeline flow rate-measuring device using dilution air, special
Sign is: nozzle connection sealing cover (4) shape is identical as nozzle (2), does not have spray orifice among nozzle connection sealing cover (4),
And nozzle connection sealing cover (4) is solid construction, cylindrical outer side is provided with screw thread.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821983746.9U CN208937113U (en) | 2018-11-29 | 2018-11-29 | Low flow velocity methane gas extraction pipeline flow rate-measuring device is detected using dilution air |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821983746.9U CN208937113U (en) | 2018-11-29 | 2018-11-29 | Low flow velocity methane gas extraction pipeline flow rate-measuring device is detected using dilution air |
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| CN208937113U true CN208937113U (en) | 2019-06-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111238583A (en) * | 2018-11-29 | 2020-06-05 | 河北金广科技有限公司 | A method for detecting the flow rate of low-velocity gas extraction pipeline by using mixed air |
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2018
- 2018-11-29 CN CN201821983746.9U patent/CN208937113U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111238583A (en) * | 2018-11-29 | 2020-06-05 | 河北金广科技有限公司 | A method for detecting the flow rate of low-velocity gas extraction pipeline by using mixed air |
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