CN110045041A - Liquefied natural gas sampling and continuously trapping system - Google Patents
Liquefied natural gas sampling and continuously trapping system Download PDFInfo
- Publication number
- CN110045041A CN110045041A CN201910418648.3A CN201910418648A CN110045041A CN 110045041 A CN110045041 A CN 110045041A CN 201910418648 A CN201910418648 A CN 201910418648A CN 110045041 A CN110045041 A CN 110045041A
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- sampling
- lng
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- natural gas
- deep cooling
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- 239000003949 liquefied natural gas Substances 0.000 title claims abstract description 114
- 238000005070 sampling Methods 0.000 title claims abstract description 105
- 239000000523 sample Substances 0.000 claims abstract description 87
- 238000002309 gasification Methods 0.000 claims abstract description 61
- 238000001816 cooling Methods 0.000 claims abstract description 53
- 238000004458 analytical method Methods 0.000 claims abstract description 32
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000003345 natural gas Substances 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 15
- 239000010985 leather Substances 0.000 claims description 40
- 238000009413 insulation Methods 0.000 claims description 24
- 239000007789 gas Substances 0.000 claims description 20
- 239000011229 interlayer Substances 0.000 claims description 17
- 229910001220 stainless steel Inorganic materials 0.000 claims description 16
- 239000010935 stainless steel Substances 0.000 claims description 16
- 238000003860 storage Methods 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 230000001276 controlling effect Effects 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 238000005485 electric heating Methods 0.000 claims description 5
- 239000003365 glass fiber Substances 0.000 claims description 5
- 239000005030 aluminium foil Substances 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 239000003463 adsorbent Substances 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 238000006356 dehydrogenation reaction Methods 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 229910000679 solder Inorganic materials 0.000 claims description 3
- 239000010410 layer Substances 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 238000013461 design Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000004781 supercooling Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000005194 fractionation Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004587 chromatography analysis Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000013536 elastomeric material Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000002207 thermal evaporation Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C6/00—Methods and apparatus for filling vessels not under pressure with liquefied or solidified gases
-
- 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
- G01N1/2226—Sampling from a closed space, e.g. food package, head space
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2201/00—Vessel construction, in particular geometry, arrangement or size
- F17C2201/01—Shape
- F17C2201/0104—Shape cylindrical
- F17C2201/0109—Shape cylindrical with exteriorly curved end-piece
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2201/00—Vessel construction, in particular geometry, arrangement or size
- F17C2201/03—Orientation
- F17C2201/032—Orientation with substantially vertical main axis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2201/00—Vessel construction, in particular geometry, arrangement or size
- F17C2201/05—Size
- F17C2201/056—Small (<1 m3)
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/03—Mixtures
- F17C2221/032—Hydrocarbons
- F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
- F17C2223/0146—Two-phase
- F17C2223/0153—Liquefied gas, e.g. LPG, GPL
- F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
- F17C2223/033—Small pressure, e.g. for liquefied gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2270/00—Applications
- F17C2270/05—Applications for industrial use
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Pathology (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Molecular Biology (AREA)
- Biomedical Technology (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a kind of sampling of liquefied natural gas and continuously trapping systems, comprising: sampling system, including LNG sampling probe form closed deep cooling cavity in the front end of the LNG sampling probe；Sampling line is threaded through in the LNG sampling probe；LNG filling liquid pipeline is threaded through in the LNG sampling probe and is connected to the closed deep cooling cavity；Gasification system, one end of the sampling line pass through the closed deep cooling cavity and connect with the gasification system, the LNG sample that the gasification system comes for the sampling line conveying of gasifying；On-line analysis system is connect with the outlet of the gasification system, for carrying out on-line analysis to the natural gas sample after gasification, and provides component of natural gas parameter；Continuous collection system is connect with the outlet of the gasification system, for continuously collecting the natural gas sample after gasifying.
Description
Technical field
The present invention relates to a kind of liquefied natural gas sampling and continuously trapping system, specifically with natural gas gas chromatographic analysis
Instrument is used cooperatively, and it is (final to provide to can be used for the LNG component analyses such as LNG receiving station harbour trade transaction, LNG tank car entrucking metering
Calorific value) application, belong to LNG sampling and analysis technical field.
Background technique
Since LNG is the liquid mixture (usual operation temperature is at -130 degrees Celsius or less) of ultralow temperature, and easily gasify,
Liquid is all easy to produce the Quick Fraction gasification of component under fine temperature and pressure variations influence, obtains before gasification true
, the flowing LNG sample that liquid mixture ratio in pipeline can be represented, there is very big difficulty.For this purpose, LNG sample is gasifying
Before must keep supercooled state, must not there is any component fractionation to gasify；It should also ensure that gas component mixing ratio and liquid after gasification
Component ratio is completely the same, just can ensure that gas chromatographicanalyzer result is consistent with sample liquids component, meets trade transaction requirement,
Meet the standard requirements such as measuring accuracy, repeatability, avoids huge economic loss.Therefore, LNG enters the sampling before gasifier
Device, and the natural gas sample collection device after being gasified are very big to analysis result accuracy and representative influence.
Existing technologies deficiency that may be present is introduced around above two aspect below:
On the one hand, LNG enters LNG gasification device from sample point by sampling probe, and the heat-insulating property of sampling probe is to obtain
The prerequisite of representative sample.The prior art mostly uses the association schemes of composite insulation material, vacuum insulation or both, generally
Think preferable using the cold insulation effect of vacuum insulation.But although with high-caliber vacuum insulation design (10 in the industry-4Pa) still
It not can avoid the leakage thermal phenomenon generated by heat radiation, and the LNG sampling probe vacuum insulation design level applied in reality is far low
In 10-4Pa.Also there is patent to inhibit LNG to be fractionated before entering gasifier, consider LNG control before entering gasifier heating
System in the supercritical state, realizes that LNG in overcritical thorough phase transformation ideally, avoids component fractionation.Such method needs
Strict control LNG reaches supercritical pressure or more, needs careful design structure size to reach ideal phase transformation effect.Once sampling
Pressure changes at point, can not such as adjust the setting of pressure control valve, may change preset sample flow and pressure
Power makes overcritical phase transition process fail.
(2) on the other hand, sample air accumulator need to be arranged in continuous sampling process, for natural during collecting entire sampling
Gas sample product, are transported in sampling steel cylinder again after collection.The structure of air accumulator designs it is ensured that whole free of losses sampling, and without previous
The component of sampling remains, the generation of no gas leak phenomenon.And existing collection device mostly uses Pressure Vessel to design, there are samples
Product mix and fill non-uniform problem.Or using the design of pressure vessels for having mechanical part, it is also easy to produce moving component friction
The problem of bite, non-homogeneous sample introduction or gas leakage.
Summary of the invention
In view of the above-mentioned problems, the object of the present invention is to provide a kind of sampling of liquefied natural gas and continuously trapping system, it can
A variety of sampling pressures are adapted to, effectively LNG sample are inhibited to gasify in advance, while it is reliable and stable to ensure that sample whole process is collected.
To achieve the above object, the present invention uses following technical scheme, and a kind of liquefied natural gas sampling and continuous collect fill
It sets characterized by comprising
Sampling system, including LNG sampling probe form closed deep cooling cavity in the front end of the LNG sampling probe；Sampling
Pipeline is threaded through in the LNG sampling probe；LNG filling liquid pipeline, be threaded through in the LNG sampling probe and with it is described closed
The connection of deep cooling cavity；
Gasification system, one end of the sampling line pass through the closed deep cooling cavity and connect with the gasification system, institute
Gasification system is stated for the next LNG sample of the sampling line conveying that gasifies；
On-line analysis system is connect with the outlet of the gasification system, for carrying out to the natural gas sample after gasification
Line analysis, and component of natural gas parameter is provided；
Continuous collection system is connect with the outlet of the gasification system, for continuously collecting the natural gas sample after gasifying.
Preferably, the closed deep cooling cavity is high vacuum multiple layer heat insulation cavity body structure, including stainless steel low temperature material
Manufactured interior outer chamber, and the high-vacuum insulation interlayer being set between interior outer chamber；The high-vacuum insulation interlayer includes
Aluminium foil, glass fiber paper and the glass fibre belt being sequentially distributed from inside to outside；Also set up in the high-vacuum insulation interlayer carbon paper, dehydrogenation agent and
Adsorbent；Thickness of interlayer 10mm, the vacuum degree of the high-vacuum insulation interlayer are 10-3Pa。
Preferably, the continuous collection system includes:
Elastic leather bag air container comprising outer tank, the elastic leather bag being built in the outer tank, the outer tank and described
Sealed storage chamber is formed between elastic leather bag；There are be connected to the sealed storage chamber for the elasticity leather bag air container bottom
Opening, the opening are connected to the gasification system, sample steel cylinder fill system respectively by pipeline；At the top of the elasticity leather bag
Setting opening, an orifice of the opening and triple valve, other two interface of triple valve are with instrument air, discharge respectively
System connection.
It preferably, further include BOG exhaust system, the closed deep cooling cavity, gasification system, on-line analysis system and institute
It states sample steel cylinder fill system and passes through pipeline and connect with BOG exhaust system, the BOG exhaust system is total by pipeline and BOG
Pipe connection.
Preferably, the LNG sampling probe, closed deep cooling cavity and gasification system are integrated in the vacuum of an independent closed
In environment, the gasification system and the closed deep cooling cavity are in upper and lower adjacent distributions, and LNG sampling probe is generally in low temperature ring
Border.
Preferably, Self-driven pressure-adjusting valve is set on the closed deep cooling cavity, the Self-driven pressure-adjusting valve passes through pipeline
It is connect with the BOG exhaust system, packet sets electric companion on the pipeline between the Self-driven pressure-adjusting valve and the BOG exhaust system
The torrid zone；Relief valve is set on the closed deep cooling cavity, and the relief valve is by pipeline and BOG discharge
System connection.
Preferably, setting is automatically shut down for controlling the first of the shutdown of the sampling line on the LNG sampling probe
Valve the second automatic cut-off valve for controlling the shutdown of the LNG filling liquid pipeline is arranged on the LNG sampling probe, described
Temperature detecting element is arranged in the exit of second automatic cut-off valve.
Preferably, sleeve is set in the outer cup of first automatic cut-off valve and the second automatic cut-off valve, described first
Stainless steel sleeve pipe is respectively mounted on the extension valve rod of automatic cut-off valve and the second automatic cut-off valve, and stainless steel sleeve pipe and valve deck are whole
Welding, forms vacuum structure, the height of the vacuum structure and the closed deep cooling cavity between the sleeve and stainless steel sleeve pipe
The connection of vacuum insulation interlayer.
Preferably, the gasification system includes temperature detecting element, regulating valve and gasifier, and the sampling line passes through institute
Temperature detecting element and regulating valve is stated to connect with the entrance of the gasifier；The gasifier uses electric heating gasification device；Institute
Stating on-line analysis system includes online chromatograph.
Preferably, the outer tank uses stainless steel material, is stressed to less as 10MPa；The elasticity leather bag is using high
Elastomeric material is at least able to bear more than 50000 inflation/deflation operations；It is used between the elasticity leather bag and the outer tank
Multiple O-shaped elastic seal ring is sealed；
Metering control is set on pipeline between the gasification system and elastic leather bag air container；
In the opening of the elastic leather bag, pressure gauge is set；
It further include vacuum pump, the vacuum pump passes through closed storage chamber of the pipeline respectively with the elastic leather bag air container
It is connected with sample steel cylinder fill system.
The invention adopts the above technical scheme, has the advantages that
1, deep cooling cavity is arranged in LNG sampling probe front end in the present invention, makees refrigerant to the LNG in sampling line using LNG
Subzero treatment is carried out, avoids LNG from being fractionated before gasification, especially for the work of degree of supercooling lower (LNG sampling pressure is lower)
Condition carries out bottom to probe or is mounted laterally, may be implemented to overcome existing product pressing the sample of various low pressure operating conditions
Power too low the problem of can not working, and LNG can be effectively suppressed and gasify in advance, it is ensured that obtain representative sample.
2, releasing pressure automatically and safe pressure relief device is arranged on closed deep cooling cavity top in the present invention, it is ensured that LNG refrigerant absorbs
After LNG sampling line heat, the normal discharge of boil-off gas, while ensuring the reliable and secure of cryogenic treatment process.
3, automatic cut-off valve of the present invention on sampling line and LNG filling liquid pipeline is all made of integral vacuum design.?
Stainless steel sleeve is installed on the extension valve rod of Subzero valve, with valve deck integral solder, forms vacuum knot between sleeve and outer tube
Structure also facilitates the on-line maintenance of valve, without destroying vacuum structure while carrying out vacuum cold insulation to LNG valve.
4, closed deep cooling cavity of the invention is designed using integral vacuum, not only LNG intracorporal to chamber carry out cold insulation every
Heat, while ensuring that deep cooling cavity is thermally shielded with gasification system, prevent cold and hot convection current.
5, the present invention develops a kind of completely new elastic leather bag air container, utilizes the elastic leather bag and instrument of built-in rubber material
The back pressure cooperation that table gas source provides, realizes collecting and fill automatically for sample；Compared with prior art, elastic balloon air accumulator benefit
With own resilient, it can be ensured that stablizing for sample introduction and out sample is smooth, avoids friction bite caused by increasing unnecessary component, non-homogeneous
The generation of sample introduction and gas leak phenomenon；More steady reliable, controllable-rate collection mode is provided continuously to collect sample, meets company
Standard requirements of the continuous sampling to sample continuous-stable sample introduction.
6, the present invention is complete set from the LNG continuous sampling for being sampled to component analysis (on-line analysis and off-line analysis)
Analytical equipment is widely used in the LNG sampling analysis of various operating conditions, can be widely applied to institute's use in need in LNG industry chain
In the facility of analysis LNG component and computing heating value.
7, the present invention will develop a kind of novel sampling sonde configuration for adapting to field sampling pressure oscillation, improve LNG sampling
It pops one's head in itself compactedness and operation convenience, and the adaptability to different sampling pressures.
Detailed description of the invention
Fig. 1 is overall structure diagram of the invention；
Fig. 2 is the structural schematic diagram of sampling system of the present invention and gasification system；
Fig. 3 is the structural schematic diagram of elastic leather bag air container of the invention.
Specific embodiment
Presently preferred embodiments of the present invention is described in detail below with reference to attached drawing, it is of the invention to be clearer to understand
Objects, features and advantages.It should be understood that embodiment shown in the drawings does not limit the scope of the present invention, and only it is
Illustrate the connotation of technical solution of the present invention.
As shown in Figure 1, the embodiment of the present invention provides a kind of sampling of liquefied natural gas and continuously trapping system, comprising: take
Sample system 1, including LNG sampling probe 11 form closed deep cooling cavity 12 in the front end of LNG sampling probe 11；Sampling line 13,
It is threaded through in LNG sampling probe 11；LNG filling liquid pipeline 14 is threaded through in LNG sampling probe 11 and connects with closed deep cooling cavity 12
It is logical；
Gasification system 2, one end of sampling line 13 pass through closed deep cooling cavity 12 and connect with gasification system 2, gasification system 2
The LNG sample come for the conveying of sampling line 13 of gasifying；
On-line analysis system 3 is connect with the outlet of gasification system 2, online for carrying out to the natural gas sample after gasification
Analysis, and component of natural gas parameter is provided；
Continuous collection system 4, connect with the outlet of gasification system 2, for continuously collecting the natural gas sample after gasifying.
In the use of the present invention, 11 one end of LNG sampling probe passes through flanged joint to the pipeline or appearance for needing component analysis
On device (such as LNG discharging general pipeline and tank car entrucking general pipeline).LNG filling liquid pipeline 14 guides LNG to enter in closed deep cooling cavity 12,
LNG gasification heat absorption in closed deep cooling cavity 12, makees subzero treatment to the sampling line 13 being located in closed deep cooling cavity 12, mentions
Height enters the degree of supercooling of LNG sample before gasification system 2, prevents from gasifying in advance, overcomes the limitation of sampling pressure in the prior art,
A variety of sampling pressures can be applicable in.LNG sampling probe, gasification system, on-line analysis system and continuous collection system have been constituted
The whole device analyzed and collected from the LNG continuous sampling for being sampled to component analysis (on-line analysis and off-line analysis), it is suitable extensively
For the LNG sampling analysis of various operating conditions, can be widely applied to institute in LNG industry chain it is in need for analyze LNG component and
In the facility of computing heating value.
In above-described embodiment, it is preferred that the invention also includes BOG exhaust system 5, closed deep cooling cavity 12, gasification system
2, on-line analysis system 3 and continuous collection system 4 are connect by pipeline with BOG exhaust system 5, and BOG exhaust system 5 passes through
Pipeline is connect with BOG general pipeline's (not shown), by gasification system 2, on-line analysis system 3 and continuous collection system 4
The BOG gas generated in extra LNG sample and closed deep cooling cavity 12 is back to BOG general pipeline.
In the above-described embodiments, it is preferred that closed deep cooling cavity 12 is high vacuum multiple layer heat insulation cavity body structure comprising no
Become rusty interior outer chamber made of steel low temperature material, and the high-vacuum insulation interlayer being set between interior outer chamber effectively obstructs
Heat transfer, thermal convection and the effect of heat radiation.High-vacuum insulation interlayer includes the aluminium foil successively wound repeatedly from inside to outside, glass
Paper and glass fibre belt；Aluminium foil is used to reduce radiant heat transfer；It is thermally conductive that glass fiber paper is used to establish the reduction of multilayer material interval radiation shield；Glass
Band prevents multilayer material from falling off for fixing multilayer material, guarantee thermal insulating layer it is secured with it is safe.Simultaneously wound carbon paper absorption
Other gases of multilayer material release, maintain the high vacuum of interlayer.Cooperation dehydrogenation agent, adsorbent remain long in cavity interlayer jointly
Long high vacuum, thickness of interlayer about 10mm, vacuum degree is about 10-3Pa, much higher than the vacuum degree of existing like product.Closed deep cooling
Cavity 12 is not only in the extremely low vacuum environment of thermal leakage ratio, it is ensured that and LNG temperature is consistent substantially with sample point temperature in cavity,
Play the role of absorbing sampling line heat simultaneously.In the cavity in pipe evaporation loss lowest range, once LNG generation gasification is
Absorbable sampling line heat, provides bigger degree of supercooling.Further, since the high vacuum multiple layer heat insulation knot of closed deep cooling cavity 12
Structure avoids cooling capacity so that the cryogenic environment inside closed deep cooling cavity 12 be kept apart with the heating environment in gasification system 2
Transmitting effectively inhibits LNG sample to gasify in advance.
In the above-described embodiments, it is preferred that as shown in Fig. 2, LNG sampling probe 11, sealing deep cooling cavity 12 and gasification system
System 2 is integrated in the vacuum environment of an independent closed, and gasification system 2 and closed deep cooling cavity 12 are in upper and lower adjacent distributions, LNG
Sampling probe 1 is generally in low temperature environment.LNG when in use, (is needed component analysis from sampling main line first by whole device
Pipeline or container) in take out, closed deep cooling cavity 12 is led by LNG filling liquid pipeline 14, to sampling line 13 carry out
Pre-cooling protection, absorbs heat, improves the degree of supercooling of LNG before entering gasification system 2, prevents from gasifying in advance.Gasification system 2 provides
Heating agent environment realizes whole Quick-gasifyings to LNG.
In the above-described embodiments, it is preferred that Self-driven pressure-adjusting valve 6, self-operated type pressure regulation are set on closed deep cooling cavity 12
Valve 6 is connect by pipeline with BOG exhaust system 5, after LNG endothermic gasification in closed deep cooling cavity 12, on cavity internal pressure
It rises, Self-driven pressure-adjusting valve 6 is opened when reaching setting pressure, and the BOG gas generated in closed deep cooling cavity 12 is emitted into BOG row
In place system 5；Packet sets electric-heating belt 7 on pipeline between Self-driven pressure-adjusting valve 6 and BOG exhaust system 5, and electric-heating belt 7 is right
Discharge gas carries out heat treatment, to ensure the medium into BOG exhaust system 5 as gaseous natural gas.In closed deep cooling cavity
Relief valve 8 is set on 12, and relief valve 8 is connect by pipeline with BOG exhaust system 5, and closed deep cooling cavity 12 is prevented
Interior superpressure will be in closed deep cooling cavity 12 by relief valve 8 when being abnormal gasification in the closed deep cooling chamber 12 of LNG
BOG safety relief to BOG exhaust system 5 in.
In above-described embodiment, it is preferred that first for controlling the shutdown of sampling line 13 is set on LNG sampling probe 11
The second automatic cut-off valve for controlling the shutdown of LNG filling liquid pipeline 14 is arranged on LNG sampling probe 11 for automatic cut-off valve 15
16, temperature detecting element 17 is set in the exit of the second automatic cut-off valve 16, for monitoring into closed deep cooling cavity 12
LNG temperature adjusts the aperture of the second automatic cut-off valve 16 with this, opened after reaching precooling temperature the first automatic cut-off valve 15 into
Row LNG sampling.
In the above-described embodiments, it is preferred that the first automatic cut-off valve 15 and the second automatic cut-off valve 16 are all made of integration
Vacuum design sets sleeve in the outer cup of the first automatic cut-off valve 15 and the second automatic cut-off valve 16, in the first automatic cut-off valve
15 and second automatic cut-off valve 16 extension valve rod on be respectively mounted stainless steel sleeve pipe, stainless steel sleeve pipe and valve deck integral solder,
Vacuum structure is formed between stainless steel sleeve pipe and sleeve, the high-vacuum insulation interlayer of the vacuum structure and closed deep cooling cavity 12 connects
It is logical, carry out integrated vacuumize process.This structure also facilitates the on-line maintenance of automatic valve, can safeguard valve by stainless steel sleeve pipe
Door bonnet, and the above element, without destroying the vacuum environment outside casing.
In the above-described embodiments, it is preferred that temperature transmitter can be used in temperature detecting element 17.
In the above-described embodiments, it is preferred that gasification system 2 includes temperature detecting element 21, regulating valve 22 and gasifier 23,
Sampling line 13 is connect by temperature detecting element 21 and regulating valve 22 with the entrance of gasifier 23.Gasifier 23 can be used electricity and add
Thermal evaporation device.
In the above-described embodiments, it is preferred that on-line analysis system 3 includes online chromatograph, is used for on-line analysis gas
The component of LNG after change.
In the above-described embodiments, it is preferred that as shown in Figure 1, Figure 3, continuous collection system 4 includes:
Elastic leather bag air container 41 comprising outer tank 411 and the elastic leather bag 412 being built in outer tank 411, outer tank
Form sealed storage chamber 413 between 411 and elastic leather bag 412, elastic 41 bottom of leather bag air container there are with sealed storage chamber
The opening of 413 connections, opening are connected to gasification system 2, sample steel cylinder fill system 42 respectively by pipeline, the filling of sample steel cylinder
System 42 is connect by pipeline with BOG exhaust system 5；It is arranged at the top of elastic leather bag 412 built in elastic leather bag air container 41
Opening, opening and an orifice of triple valve 43, other two interface of triple valve respectively with instrument air 44, exhaust system 45
Air inlet and exhaust in elastic leather bag 412 are realized in connection by the interface switching of triple valve.
In use, the gas samples in gasification system 2 are filled with closed when elastic leather bag 412 is vented to exhaust system 45
In storage chamber 413, pressure at expulsion is adjusted to change sample collection rate by exhaust system 45, it is ensured that sample feeding steadily may be used
It leans on, at the uniform velocity controllably.When instrument air 44 is inflated into elastic leather bag 412, elastic leather bag 412 expands, in closed storage chamber 413
Gas, which is extruded, to be filled in sample steel cylinder fill system 42, to facilitate off-line analysis.
In above-described embodiment, it is preferred that meter is set on the pipeline between gasification system 2 and elastic leather bag air container 41
Amount control device 46 carries out flow adjusting to gaseous sample, and pressure gauge 47 is arranged in the opening of elastic leather bag 412.
In the above-described embodiments, it is preferred that continuous collection system 4 further includes vacuum pump 48, and vacuum pump 48 passes through pipeline point
It is not connect with the closed storage chamber 413 of elastic leather bag air container 41 and sample steel cylinder fill system 42, for closed storage
Chamber 413 and sample steel cylinder fill system 42 carry out vacuumize process.Start to fill natural gas sample to closed storage chamber 413 every time
Before this, i.e., when leather bag is in full of instrument gaseity, opens vacuum pump 48 and extract the residual sample gas in closed storage chamber 413
Body, it is ensured that without retaining for last sampling sample.
In the above-described embodiments, it is preferred that outer tank 411 uses stainless steel material, is stressed to less as 10MPa, elasticity
Leather bag 412 uses high elastic rubber material, can at least bear more than 50000 inflation/deflation operations.Elastic leather bag 412 and outer tank
It is sealed between 411 using multiple O-shaped elastic seal ring, plays the role of isolating seal, prevent gas samples and leather bag
The instrument air mixing inside filled.
Since the demand to LNG component (including LNG caloricity gaging) is increasingly extensive, the present apparatus is in structure design, material choosing
It selects, Operation and Maintenance etc. comprehensively considers land, the specific demand of marine operating condition.It can be sampled at subzero 130 degrees Celsius.?
By adjusting setting angle, the LNG sampling of various operating pressure operating conditions can be applicable to.
The present invention is only illustrated with above-described embodiment, and structure, setting position and its connection of each component are all can have
Changed.Based on the technical solution of the present invention, the improvement or equivalent that all principles according to the present invention carry out individual part
Transformation, should not exclude except protection scope of the present invention.
Claims (10)
1. a kind of liquefied natural gas sampling and continuously trapping system characterized by comprising
Sampling system (1), including LNG sampling probe (11) form closed deep cooling chamber in the front end of the LNG sampling probe (11)
Body (12)；Sampling line (13) is threaded through in the LNG sampling probe (11)；LNG filling liquid pipeline (14), is threaded through the LNG
It is connected in sampling probe (11) and with the closed deep cooling cavity (12)；
One end of gasification system (2), the sampling line (13) passes through the closed deep cooling cavity (12) and the gasification system
(2) it connects, the LNG sample that the gasification system (2) is come for the sampling line (13) conveying of gasifying；
On-line analysis system (3) is connect with the outlet of the gasification system (2), for carrying out to the natural gas sample after gasification
On-line analysis, and component of natural gas parameter is provided；
Continuous collection system (4), connect with the outlet of the gasification system (2), for continuously collecting the natural gas sample after gasifying
Product.
2. liquefied natural gas sampling as described in claim 1 and continuously trapping system, it is characterised in that: the closed deep cooling chamber
Body (12) is high vacuum multiple layer heat insulation cavity body structure, including interior outer chamber made of stainless steel low temperature material, and is set to
High-vacuum insulation interlayer between interior outer chamber；The high-vacuum insulation interlayer includes the aluminium foil being sequentially distributed from inside to outside, glass
Fine paper and glass fibre belt；Carbon paper, dehydrogenation agent and adsorbent are also set up in the high-vacuum insulation interlayer；Thickness of interlayer 10mm, it is described
The vacuum degree of high-vacuum insulation interlayer is 10-3Pa。
3. liquefied natural gas sampling as described in claim 1 and continuously trapping system, which is characterized in that the continuous collection system
System (4) include:
Elastic leather bag air container (41) comprising outer tank (411), the elastic leather bag being built in the outer tank (411)
(412), sealed storage chamber (413) are formed between the outer tank (411) and the elastic leather bag (412)；The elasticity leather bag storage
Gas container (41) bottom there are the opening being connected to the sealed storage chamber (413), the opening by pipeline respectively with it is described
Gasification system (2), sample steel cylinder fill system (42) connection；Setting opening at the top of elasticity leather bag (412), the opening with
One orifice of triple valve (43), other two interface of triple valve (43) respectively with instrument air (44), exhaust system (45)
Connection.
4. liquefied natural gas sampling as claimed in claim 3 and continuously trapping system, it is characterised in that: further include BOG discharge
System (5), the closed deep cooling cavity (12), gasification system (2), on-line analysis system (3) and sample steel cylinder filling
System (42) is connect by pipeline with BOG exhaust system (5), and the BOG exhaust system (5) is connected by pipeline and BOG general pipeline
It connects.
5. liquefied natural gas sampling as described in claim 1 and continuously trapping system, it is characterised in that: the LNG sampling is visited
Head (11), closed deep cooling cavity (12) and gasification system (2) are integrated in the vacuum environment of an independent closed, the gasification system
It unites (2) and the closed deep cooling cavity (12) is in upper and lower adjacent distributions, LNG sampling probe (1) is generally in low temperature environment.
6. liquefied natural gas sampling as claimed in claim 4 and continuously trapping system, it is characterised in that: in the closed deep cooling
Self-driven pressure-adjusting valve (6) are set on cavity (12), the Self-driven pressure-adjusting valve (6) passes through pipeline and the BOG exhaust system (5)
It connects, packet sets electric-heating belt (7) on the pipeline between the Self-driven pressure-adjusting valve (6) and the BOG exhaust system (5)；?
Relief valve (8) are set on the closed deep cooling cavity (12), the relief valve (8) is arranged by pipeline and the BOG
Place system (5) connection.
7. liquefied natural gas sampling as claimed in claim 2 and continuously trapping system, it is characterised in that: the LNG sampling is visited
The first automatic cut-off valve (15) for controlling the shutdown of the sampling line (13) is set on head (11), and the LNG sampling is visited
The second automatic cut-off valve (16) for controlling the shutdown of the LNG filling liquid pipeline (14) is set on head (11), described second
Temperature detecting element (17) are arranged in the exit of automatic cut-off valve (16).
8. liquefied natural gas sampling as claimed in claim 7 and continuously trapping system, it is characterised in that: automatic described first
The outer cup of shut-off valve (15) and the second automatic cut-off valve (16) sets sleeve, first automatic cut-off valve (15) and second from
Stainless steel sleeve pipe, and stainless steel sleeve pipe and valve deck integral solder, the sleeve are respectively mounted on the extension valve rod of dynamic shut-off valve (16)
Vacuum structure, the high-vacuum insulation folder of the vacuum structure and the closed deep cooling cavity (12) are formed between stainless steel sleeve pipe
Layer connection.
9. liquefied natural gas sampling as described in claim 1 and continuously trapping system, it is characterised in that: the gasification system
It (2) include temperature detecting element (21), regulating valve (22) and gasifier (23), the sampling line (13) is examined by the temperature
It surveys element (21) and regulating valve (22) is connect with the entrance of the gasifier (23)；The gasifier (23) uses electric heating gas
Change device；The on-line analysis system (3) includes online chromatograph.
10. liquefied natural gas sampling as claimed in claim 3 and continuously trapping system, it is characterised in that: the outer tank (411)
Using stainless steel material, it is stressed to less as 10MPa；The elasticity leather bag (412) uses high elastic rubber material, at least can
Enough bear more than 50000 inflation/deflation operations；Multiple O-shaped bullet is used between the elasticity leather bag (412) and the outer tank (411)
Property sealing ring is sealed；
Metering control (46) are set on pipeline between the gasification system (2) and elastic leather bag air container (41)；
In the opening of the elastic leather bag (412), pressure gauge (47) are set；
It further include vacuum pump (48), the vacuum pump (48) is close with the elastic leather bag air container (41) respectively by pipeline
Close storage chamber (413) and sample steel cylinder fill system (42) connection.
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| CN110824078A (en) * | 2019-09-24 | 2020-02-21 | 合肥工业大学 | Temperature-controllable trace high-purity liquid sample evaporation device |
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| CN116718438A (en) * | 2023-08-07 | 2023-09-08 | 苏州杜尔气体化工装备有限公司 | Gas quality detection sampling device for natural gas skid-mounted gas station |
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