CN108871884A - A kind of natural gas automatic continuous sampling system of solar control - Google Patents
A kind of natural gas automatic continuous sampling system of solar control Download PDFInfo
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- CN108871884A CN108871884A CN201811100816.6A CN201811100816A CN108871884A CN 108871884 A CN108871884 A CN 108871884A CN 201811100816 A CN201811100816 A CN 201811100816A CN 108871884 A CN108871884 A CN 108871884A
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- natural gas
- steel cylinder
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- solenoid valve
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- 238000005070 sampling Methods 0.000 title claims abstract description 173
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 139
- 239000003345 natural gas Substances 0.000 title claims abstract description 69
- 239000000523 sample Substances 0.000 claims abstract description 40
- 239000007789 gas Substances 0.000 claims abstract description 26
- 238000006243 chemical reaction Methods 0.000 claims abstract description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 65
- 239000010959 steel Substances 0.000 claims description 65
- 238000001914 filtration Methods 0.000 claims description 10
- 230000002045 lasting effect Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 4
- 239000012530 fluid Substances 0.000 abstract description 3
- 230000002411 adverse Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 8
- 238000005259 measurement Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002341 toxic gas Substances 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention belongs to detection of natural gas technical fields, more particularly to a kind of natural gas automatic continuous sampling system of solar control, sampling control panel is connect with solenoid valve, solar panels absorb solar energy, and electric energy being converted solar energy by solar controller, while the electric energy of solar controller conversion is sampling control panel power supply, sampling control panel passes through control solenoid valve, to control the movement of pneumatic diaphragm sampling pump, so that controlling sample probe realizes continuous sampling.The present invention can be realized automatic sampling, and gas sampled is fully able to represent the fluid media (medium) in the entire production cycle, representative.System does not need that power supply is provided separately using solar powered.And the natural gas in the control gas source taken from pipeline of pneumatic diaphragm sampling pump, do not have to individually supply instrument air, it can be ensured that be used for a long time under adverse circumstances from far-off regions.
Description
Technical field
The invention belongs to detection of natural gas technical fields, automatic continuous more particularly to a kind of natural gas of solar control
Sampling system.
Background technique
Being determined to of gas component provides strong guarantee for gas trade transaction, flow measurement etc..And natural gas group
At the accuracy of measurement be heavily dependent on sampling technique.Traditional sampling system is to pass through the natural gas in pipeline
Sample probe sampling, then after pressure reducing valve depressurizes, collects the natural gas in pipeline with sampling steel cylinder, then goes reality
Test room chemical examination detection.Because of traditional sampling system, when sampling, gas medium (such as Fig. 1 on sometime point can only be intercepted
It is shown), gas sampled does not have representativeness.If especially fluid is unstable, sampling medium and pipeline real medium are had very greatly
Deviation;Natural Gas Analysis is influenced very big.Inherently there is a certain amount of air inside sampling steel cylinder, the gas being finally collected into
Body is really the blending agent of air in natural gas and steel cylinder in pipeline.If the gas in sampling steel cylinder is set with natural gas in advance
It swaps out, it is extremely dangerous in manual operation.If the person peace for the operator that but will be threatened in natural gas containing toxic gas
Entirely.Artificially judge whether be full of when sampling in steel cylinder, cannot intuitively show steel pressure of the inside of a bottle.Pressure is higher in pipeline, and operation is not
When the personal safety that can threaten operator.It is likely to result in gas condensation when natural gas depressurization, will cause sampling component in this way
It is not inconsistent with real medium.Full manual operation, the degree of automation are low.And in some remote districts, environment is more severe, existing
Sampling system is not able to satisfy requirement.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned technical problems, and to provide a kind of natural gas of solar control is automatic continuous
Sampling system can be fully solved above-mentioned technical problem.
The technical solution for solving above-mentioned technical problem is as follows:
A kind of natural gas automatic continuous sampling system of solar control, the sampling including connecting with natural gas line are visited
The outlet of needle, sample probe is divided into two-way by pipeline, wherein connect all the way with pneumatic diaphragm sampling pump, another way by pipeline with
The outlet end of constant pressure sampling steel cylinder is connected, the inlet and outlet pressure for balanced sampling steel cylinder.Natural gas is adopted by pneumatic diaphragm
It after sample pump, is quantitatively sent to the arrival end of constant pressure sampling steel cylinder, Pneumatic control circuit pipeline, institute is set on pneumatic diaphragm sampling pump
Be serially connected with filtering pressure reducing valve and solenoid valve on the Pneumatic control circuit pipeline stated, the control gas source of pneumatic diaphragm sampling pump be derived from into
The natural gas of mouth, natural gas pass through the filtering of filtering pressure reducing valve and are depressurized to suitable pressure, be then applied to by solenoid valve
On the diaphragm of pneumatic diaphragm sampling pump, control of the solenoid valve by automatic sampling control system;When solenoid valve electrification, solenoid valve
Inlet and outlet conducting, natural gas are applied on the diaphragm of pneumatic diaphragm sampling pump by solenoid valve, pneumatic diaphragm sampling pump movement one
It is secondary, a certain amount of natural gas is pumped to constant pressure sampling steel cylinder, when solenoid valve power loss, the outlet of solenoid valve and drain conducting,
The natural gas of pneumatic diaphragm sampling pump diaphragm cavity is discharged by the drain of solenoid valve, and natural gas is discharged into peace by high point emptying
All positon;The automatic sampling control system includes sequentially connected sampling control panel, solar controller, battery, too
Positive energy plate, the sampling control panel are connect with solenoid valve, and solar panels absorb solar energy, and will too by solar controller
Sun can be converted to electric energy, and be stored in battery, while the electric energy of solar controller conversion is sampling control panel power supply, if
It breaks down or when rainy weather, the electric energy in battery can guarantee to provide lasting electric power, sampling control for sampling control panel
Disk processed is by control solenoid valve, to control the sampling period of pneumatic diaphragm sampling pump, realizes continuous sampling.
Further to say, the constant pressure sampling steel cylinder is piston type sampling steel cylinder, and every sub-sampling realizes that equivalent samples,
Pneumatic diaphragm sampling pump pumps the natural gas of equivalent, until constant pressure sampling steel cylinder is filled.
It further says, the constant pressure sampling steel cylinder outlet end and arrival end are provided with pressure instruction, constant pressure sampling
It is additionally provided with piston position instruction on steel cylinder, shows sampling steel cylinder current state.
It further says, the solenoid valve is two-bit triplet solenoid valve.
It further says, is provided on the pipeline that the pneumatic diaphragm sampling pump is connect with constant pressure sampling steel cylinder arrival end
The first ball valve and the first needle-valve is respectively set in first flexible hose, the both ends of the first flexible hose;
The constant pressure sampling steel cylinder outlet end is provided with the second flexible hose, and the both ends of the second flexible hose are set respectively
Set the second needle-valve and the second ball valve;
The outlet conduit of the constant pressure sampling steel cylinder also connects with pneumatic diaphragm sampling pump and constant pressure sampling steel cylinder arrival end
The pipeline connect is connected to, and passes through the natural gas vent in the 4th ball valve and the 5th ball valve control pipeline on pipeline;
The outlet conduit of the constant pressure sampling steel cylinder is also connected with the outlet conduit of sample probe, is arranged on the pipeline
There is third ball valve;
The sample probe carries circulation line.
Constant pressure sampling steel cylinder closes the first ball valve, the first needle-valve, the second needle-valve, the second ball valve after filling, then first
The sampling steel cylinder end of soft second flexible hose of flexible pipe is unclamped, by related first needle-valve of constant pressure sampling steel cylinder and the second needle-valve one
It rises and removes, take laboratory or other experiment mechanisms carry out detection chemical examination.
For the representativeness for ensuring gas sampled, the gas of internal system need to be arranged when automatic sampling system is initially use
Then sky just can enter natural gas.
The beneficial effects of the invention are as follows:
The present invention provides a kind of natural gas automatic continuous sampling systems, have the following advantages that:
(1) it can be realized continuous sampling, the sampling period oneself can set according to demand.Due to sampling at regular intervals
Once until constant pressure sampling steel cylinder is filled, so gas sampled is fully able to represent the fluid media (medium) in the entire production cycle, tool
It is representative.
(2) system uses solar powered, does not need that power supply is provided separately.And the control of pneumatic diaphragm sampling pump
Natural gas in gas source taken from pipeline does not have to individually supply instrument air, it can be ensured that long-term under adverse circumstances from far-off regions
It uses.
(3) it can be realized automatic sampling, abandoning tradition sampling system needs manual hand manipulation and waited in sampling process
Sampling gas cylinder is filled.Operating process is simplified, reduces workload, and can ensure the personal safety of operator.
(4) other gases inside sampling system and sampling steel cylinder have been drained off before sampling system starting, the gas of sampling
Body only has the natural gas in pipeline, avoids the interference of miscellaneous gas.Before automatic sampling system formally starts, by being manually operated
Other gases in system and in steel cylinder are discharged into safety zone.Easy-to-operate, even if containing hydrogen sulfide in natural gas
Equal toxic gases, will not threaten the personal safety of operator.
(5) constant pressure sampling steel cylinder front and back belt pressure gauge can show pressure value before and after steel cylinder.Magnetic piston is had on steel cylinder
Position indicator can clearly show the state of current sample steel cylinder.
(6) circulatory system is provided in sampling system, natural gas is always flowing in process pipe, is being
Circulation is updated in system.Ensuring no matter when sample, the gas of sampling is all the natural gas of process pipe now thereof, rather than on
The natural gas of system remaining when sub-sampling.
Detailed description of the invention
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is natural gas line tradition sampling system schematic diagram;
Fig. 2 is the natural gas automatic continuous sampling system schematic of solar control of the present invention;
Wherein, in Fig. 1:1 is sample probe, and 2 be pressure reducing valve, and 3 be the first ball valve, and 4 be the second ball valve, and 5 be pressure gauge, 6
It is the first needle-valve for flexible hose, 7,8 be sampling steel cylinder, and 9 be the second needle-valve, and 10 be natural gas line;
In Fig. 2:1 is sample probe, and 2 be pneumatic diaphragm sampling pump, and 3 be the first ball valve, and 4 be the first flexible hose, and 5 be the
One needle-valve, 6 be constant pressure sampling steel cylinder, and 7 be the second needle-valve, and 8 be the second flexible hose, and 9 be the second ball valve, and 10 be third ball valve,
11 be the 4th ball valve, and 12 be filtering pressure reducing valve, and 13 be solenoid valve, and 14 are vented for high point, and 15 be solar panels, and 16 be solar energy control
Device processed, 17 be battery, and 18 is sample control panel, and 19 be the 5th ball valve, and 20 be natural gas line.
Specific embodiment
Embodiment 1:
A kind of natural gas automatic continuous sampling system of solar control, the sampling including connecting with natural gas line 20 are visited
The outlet of needle 1, sample probe 1 is divided into two-way by pipeline, wherein connecting all the way with pneumatic diaphragm sampling pump 2, another way passes through pipe
Road is connected with the outlet end of constant pressure sampling steel cylinder 6, and natural gas is taken after pneumatic diaphragm sampling pump 2 by quantitatively sending to constant pressure
Pneumatic control circuit pipeline is arranged on pneumatic diaphragm sampling pump 2, concatenates on Pneumatic control circuit pipeline for the arrival end of sample steel cylinder 6
There are filtering pressure reducing valve 12 and solenoid valve 13, the control gas source of pneumatic diaphragm sampling pump 2 is derived from the natural gas of entrance, and natural gas passes through
The filtering of filtering pressure reducing valve 12 is simultaneously depressurized to suitable pressure, is then applied to pneumatic diaphragm sampling pump 2 by solenoid valve 13
On diaphragm, control of the solenoid valve 13 by automatic sampling control system;When solenoid valve 13 charges, the inlet and outlet of solenoid valve 13 are led
Logical, natural gas is applied on the diaphragm of pneumatic diaphragm sampling pump 2 by solenoid valve 13, and pneumatic diaphragm sampling pump 2 acts once, to
Constant pressure sampling steel cylinder 6 pumps a certain amount of natural gas, when 13 power loss of solenoid valve, the outlet of solenoid valve 13 and drain conducting,
The natural gas of 2 diaphragm cavity of pneumatic diaphragm sampling pump is discharged by the drain of solenoid valve 13, and natural gas is vented 14 rows by high point
It is put into home;Automatic sampling control system includes sequentially connected sampling control panel 18, solar controller 16, battery
17, solar panels 15, sampling control panel 18 are connect with solenoid valve 13, and solar panels 15 absorb solar energy, and pass through solar energy control
Device 16 processed converts solar energy into electric energy, and is stored in battery 17, while the electric energy that solar controller 16 converts is to take
Sample control panel 18 is powered, if breaking down or when rainy weather, the electric energy in battery 17 can guarantee to sample control panel 18
Lasting electric power is provided, sampling control panel 18 is by control solenoid valve 13, to control the sampling week of pneumatic diaphragm sampling pump 2
Phase realizes continuous sampling.Constant pressure sampling steel cylinder 6 is piston type sampling steel cylinder, and every sub-sampling realizes that equivalent samples, pneumatic diaphragm
Sampling pump 2 pumps the natural gas of equivalent, until constant pressure sampling steel cylinder 6 is filled.6 outlet end of constant pressure sampling steel cylinder and arrival end are all provided with
It is equipped with pressure instruction, piston position instruction is additionally provided on constant pressure sampling steel cylinder 6, shows sampling steel cylinder current state.Solenoid valve
13 be two-bit triplet solenoid valve.First is provided on the pipeline that pneumatic diaphragm sampling pump 2 is connect with 6 arrival end of constant pressure sampling steel cylinder
The first ball valve 3 and the first needle-valve 5 is respectively set in flexible hose 4, the both ends of the first flexible hose 4;Constant pressure sampling steel cylinder 6 exports
End is provided with the second flexible hose 8, and the second needle-valve 7 and the second ball valve 9 is respectively set in the both ends of the second flexible hose 8;Constant pressure
The pipeline connection that the outlet conduit of sampling steel cylinder 6 is also connect with pneumatic diaphragm sampling pump 2 with 6 arrival end of constant pressure sampling steel cylinder, pipe
Pass through the natural gas vent in the 4th ball valve 11 and the 5th ball valve 19 control pipeline on road;The outlet conduit of constant pressure sampling steel cylinder 6
Also it is connected with the outlet conduit of sample probe 1, third ball valve 10 is provided on the pipeline;Sample probe 1 carries circulation line.
Implementation method is as follows:
1, the 5th ball valve 19 and third ball valve 10 are closed, the first ball valve 3, the first needle-valve 5, the second needle-valve 7, the second ball are opened
Valve 9, the 4th ball valve 11.Start pneumatic diaphragm sampling pump 2, by natural gas being pumped into constant pressure sampling steel cylinder 6 slowly, constant pressure is taken
Piston in sample steel cylinder 6 is slowly moved to outlet end, and the residual gas of outlet end is slowly discharged into safety by high point emptying 14
Position.
2, stop pneumatic diaphragm sampling pump 2, close the 4th ball valve 11, open the 5th ball valve 19, the first ball valve 3, the first needle
Valve 5, the second needle-valve 7, the second ball valve 9.Third ball valve 10 is slowly opened, gas slowly enters 6 outlet end of constant pressure sampling steel cylinder, permanent
Piston in pressure sampling steel cylinder 6 is slowly moved to arrival end, and the gas of arrival end is slowly discharged into safety by high point emptying 14
Position.All confirm that the 4th ball valve 11 and the 5th ball valve 19 are in the closed position after emptying.
3, sample probe 1 is there are two interface, and for sampling, another interface flows back an interface for natural gas.In this way
The natural gas in sampling line can be made to be always flowing.It can ensure that gas when sampling is that process pipe is current in this way
The natural gas of flowing, rather than when previous sample system remaining natural gas.
The above is only presently preferred embodiments of the present invention, not does limitation in any form to the present invention, it is all according to
According to any simple modification to the above embodiments in technical spirit of the invention, equivalent variations, guarantor of the invention is each fallen within
Within the scope of shield.
Claims (5)
1. a kind of natural gas automatic continuous sampling system of solar control, including the sample probe being connect with natural gas line,
It is characterized in that, the outlet of sample probe is divided into two-way by pipeline, wherein connecting all the way with pneumatic diaphragm sampling pump, another way is logical
Piping is connected with the outlet end of constant pressure sampling steel cylinder, and natural gas is quantitatively sent after pneumatic diaphragm sampling pump to constant pressure
Pneumatic control circuit pipeline, the Pneumatic control circuit pipeline are arranged on pneumatic diaphragm sampling pump for the arrival end of sampling steel cylinder
On be serially connected with filtering pressure reducing valve and solenoid valve, the control gas source of pneumatic diaphragm sampling pump is derived from the natural gas of entrance, natural gas warp
It crosses the filtering of filtering pressure reducing valve and is depressurized to suitable pressure, the diaphragm of pneumatic diaphragm sampling pump is then applied to by solenoid valve
On, control of the solenoid valve by automatic sampling control system;When solenoid valve electrification, the inlet and outlet conducting of solenoid valve, natural gas leads to
It crosses solenoid valve to be applied on the diaphragm of pneumatic diaphragm sampling pump, the movement of pneumatic diaphragm sampling pump is primary, pumps to constant pressure sampling steel cylinder
A certain amount of natural gas is sent, when solenoid valve power loss, the outlet of solenoid valve and drain conducting, pneumatic diaphragm sampling pump diaphragm cavity
Natural gas be discharged by the drain of solenoid valve, natural gas is discharged into home by high point emptying;Described takes automatically
Sample control system includes sequentially connected sampling control panel, solar controller, battery, solar panels, the sampling control
Disk processed is connect with solenoid valve, and solar panels absorb solar energy, and convert solar energy into electric energy by solar controller, and deposit
Storage is in battery, while the electric energy of solar controller conversion is sampling control panel power supply, if breaking down or rainy weather
When, the electric energy in battery can guarantee to provide lasting electric power for sampling control panel, sampling control panel by control solenoid valve,
To control the sampling period of pneumatic diaphragm sampling pump, continuous sampling is realized.
2. the natural gas automatic continuous sampling system of solar control according to claim 1, which is characterized in that described
Constant pressure sampling steel cylinder is piston type sampling steel cylinder, and every sub-sampling realizes that equivalent samples, and pneumatic diaphragm sampling pump pumps equivalent
Natural gas, until constant pressure sampling steel cylinder is filled.
3. the natural gas automatic continuous sampling system of solar control according to claim 2, which is characterized in that described
Constant pressure sampling steel cylinder outlet end and arrival end are provided with pressure instruction, are additionally provided with piston position on constant pressure sampling steel cylinder and refer to
Show, shows sampling steel cylinder current state.
4. the natural gas automatic continuous sampling system of solar control according to claim 1, which is characterized in that described
Solenoid valve is two-bit triplet solenoid valve.
5. the natural gas automatic continuous sampling system of solar control according to claim 1, which is characterized in that described
The first flexible hose, the first flexible hose are provided on the pipeline that pneumatic diaphragm sampling pump is connect with constant pressure sampling steel cylinder arrival end
Both ends the first ball valve and the first needle-valve is respectively set;
The constant pressure sampling steel cylinder outlet end is provided with the second flexible hose, and the both ends of the second flexible hose are respectively set
Two needle-valves and the second ball valve;
What the outlet conduit of the constant pressure sampling steel cylinder was also connect with pneumatic diaphragm sampling pump with constant pressure sampling steel cylinder arrival end
Pipeline is connected to, and passes through the natural gas vent in the 4th ball valve and the 5th ball valve control pipeline on pipeline;
The outlet conduit of the constant pressure sampling steel cylinder is also connected with the outlet conduit of sample probe, and is provided on the pipeline
Three ball valves;
The sample probe carries circulation line.
Priority Applications (1)
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CN201811100816.6A CN108871884A (en) | 2018-09-20 | 2018-09-20 | A kind of natural gas automatic continuous sampling system of solar control |
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CN201811100816.6A CN108871884A (en) | 2018-09-20 | 2018-09-20 | A kind of natural gas automatic continuous sampling system of solar control |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111855324A (en) * | 2020-08-03 | 2020-10-30 | 承德石油高等专科学校 | Natural gas sample collection method for detecting mercury content of natural gas |
CN112432823A (en) * | 2020-11-11 | 2021-03-02 | 上海邦有道商贸有限公司 | Sampling system for natural gas outward transportation main pipe |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN201956717U (en) * | 2011-01-18 | 2011-08-31 | 厦门马思特光电技术有限公司 | Solar energy system |
CN106969950A (en) * | 2017-04-28 | 2017-07-21 | 中国石油天然气集团公司 | Gas pipeline automatic sampling system integration sledge fills method |
CN207007584U (en) * | 2017-04-28 | 2018-02-13 | 中国石油天然气集团公司 | Gas pipeline automatic sampling system integration skid-mounted unit |
CN208888008U (en) * | 2018-09-20 | 2019-05-21 | 杰瑞(天津)石油工程技术有限公司 | A kind of natural gas automatic continuous sampling system of solar control |
-
2018
- 2018-09-20 CN CN201811100816.6A patent/CN108871884A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN201956717U (en) * | 2011-01-18 | 2011-08-31 | 厦门马思特光电技术有限公司 | Solar energy system |
CN106969950A (en) * | 2017-04-28 | 2017-07-21 | 中国石油天然气集团公司 | Gas pipeline automatic sampling system integration sledge fills method |
CN207007584U (en) * | 2017-04-28 | 2018-02-13 | 中国石油天然气集团公司 | Gas pipeline automatic sampling system integration skid-mounted unit |
CN208888008U (en) * | 2018-09-20 | 2019-05-21 | 杰瑞(天津)石油工程技术有限公司 | A kind of natural gas automatic continuous sampling system of solar control |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111855324A (en) * | 2020-08-03 | 2020-10-30 | 承德石油高等专科学校 | Natural gas sample collection method for detecting mercury content of natural gas |
CN112432823A (en) * | 2020-11-11 | 2021-03-02 | 上海邦有道商贸有限公司 | Sampling system for natural gas outward transportation main pipe |
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Application publication date: 20181123 |