CN110045041B - Liquefied natural gas sampling and continuous collecting device - Google Patents
Liquefied natural gas sampling and continuous collecting device Download PDFInfo
- Publication number
- CN110045041B CN110045041B CN201910418648.3A CN201910418648A CN110045041B CN 110045041 B CN110045041 B CN 110045041B CN 201910418648 A CN201910418648 A CN 201910418648A CN 110045041 B CN110045041 B CN 110045041B
- Authority
- CN
- China
- Prior art keywords
- lng
- sampling
- cavity
- valve
- pipeline
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000003949 liquefied natural gas Substances 0.000 title claims abstract description 113
- 238000005070 sampling Methods 0.000 title claims abstract description 107
- 239000000523 sample Substances 0.000 claims abstract description 78
- 238000002309 gasification Methods 0.000 claims abstract description 50
- 239000007789 gas Substances 0.000 claims abstract description 32
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000011049 filling Methods 0.000 claims abstract description 23
- 239000003345 natural gas Substances 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 230000000149 penetrating effect Effects 0.000 claims abstract description 8
- 239000010985 leather Substances 0.000 claims description 33
- 238000009413 insulation Methods 0.000 claims description 21
- 239000011229 interlayer Substances 0.000 claims description 18
- 229910001220 stainless steel Inorganic materials 0.000 claims description 17
- 239000010935 stainless steel Substances 0.000 claims description 17
- 230000001105 regulatory effect Effects 0.000 claims description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 239000003365 glass fiber Substances 0.000 claims description 8
- 239000010410 layer Substances 0.000 claims description 8
- 230000001276 controlling effect Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 239000011888 foil Substances 0.000 claims description 4
- 238000007789 sealing Methods 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
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 238000006356 dehydrogenation reaction Methods 0.000 claims description 2
- 239000006200 vaporizer Substances 0.000 description 8
- 238000013461 design Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 5
- 238000002347 injection Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000005194 fractionation Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000004781 supercooling Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 239000012774 insulation material Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 230000008016 vaporization Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005485 electric heating Methods 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
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002516 radical scavenger Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000004804 winding 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
Abstract
The invention discloses a liquefied natural gas sampling and continuous collecting device, which comprises: the sampling system comprises an LNG sampling probe, and a closed cryogenic cavity is formed at the front end of the LNG sampling probe; the sampling pipeline is arranged in the LNG sampling probe in a penetrating way; the LNG liquid filling pipeline is arranged in the LNG sampling probe in a penetrating way and is communicated with the closed cryogenic cavity; one end of the sampling pipeline passes through the closed cryogenic cavity to be connected with the gasification system, and the gasification system is used for gasifying the LNG sample conveyed by the sampling pipeline; the online analysis system is connected with the outlet of the gasification system and is used for carrying out online analysis on the gasified natural gas sample and providing gas component parameters; and the continuous collection system is connected with the outlet of the gasification system and is used for continuously collecting gasified natural gas samples.
Description
Technical Field
The invention relates to a liquefied natural gas sampling and continuous collecting device, which is particularly matched with a natural gas chromatograph for use, can be used for LNG component analysis (finally providing a heating value) application occasions such as LNG receiving station wharf trade handover, LNG tank wagon loading metering and the like, and belongs to the technical field of LNG sampling and analysis.
Background
Because LNG is an ultra-low temperature liquid mixture (typically operating at temperatures below-130 degrees celsius) and is extremely easily vaporized, liquids are subject to rapid fractionation vaporization of components under the influence of subtle temperature and pressure changes, and there is great difficulty in obtaining a true flowing LNG sample that can represent the ratio of liquid mixtures in a pipeline prior to vaporization. For this reason, LNG samples must be kept in a supercooled state before gasification, and must not have any components fractionated for gasification; after gasification, the mixing ratio of the gas components and the liquid components are completely consistent, the result of the gas chromatograph is consistent with the liquid components of the sample, the trade handover requirement is met, the standard requirements of metering precision, repeatability and the like are met, and excessive economic loss is avoided. Therefore, the sampling device before LNG enters the vaporizer, and the natural gas sample collection device after being vaporized have a great influence on the accuracy and representativeness of the analysis result.
The following describes the possible deficiencies of the existing technology around the above two aspects:
in one aspect, LNG enters the LNG vaporizer from a sampling point through a sampling probe, the insulating properties of which are a prerequisite for taking a representative sample. In the prior art, a composite heat insulation material, a vacuum heat insulation or a combination scheme of the composite heat insulation material and the vacuum heat insulation material is generally considered to have a better cold insulation effect by adopting the vacuum heat insulation. However, despite the adoption of an industry-high level vacuum insulation design (10 -4 Pa) is still unavoidable from heat leakage due to heat radiation, while the practical vacuum insulation design level of LNG sampling probes is far below 10 -4 Pa. There are also patents for suppressing fractionation of LNG before entering a vaporizer, and considering that LNG is controlled in a supercritical state before entering a vaporizer for heating, complete phase transition of LNG in a supercritical ideal state is achieved, and component fractionation is avoided. The method needs to strictly control LNG to reach above the supercritical pressure, and the structural size needs to be accurately designed to achieve the ideal phase change effect. Once the pressure at the sampling point changes, if the setting of the pressure control element cannot be adjusted, the preset sampling flow and pressure may be changed, so that the supercritical phase change process fails.
On the other hand, the continuous sampling flow needs to be provided with a sample gas storage tank for collecting the natural gas sample in the whole sampling period, and the natural gas sample is conveyed to a sampling steel cylinder after being collected. The structural design of the air storage tank ensures no loss sampling in the whole process, no component residue in the previous sampling and no air leakage. The existing collection device mostly adopts a single pressure container design, and the problems of uneven sample mixing and filling exist. Or the pressure vessel with the mechanical component is adopted, so that the problems of friction blocking, nonuniform sample injection or air leakage of the moving component are easily generated.
Disclosure of Invention
Aiming at the problems, the invention aims to provide the liquefied natural gas sampling and continuous collecting device which can adapt to various sampling pressures, effectively inhibit LNG samples from gasifying in advance and ensure that the samples are collected stably and reliably in the whole process.
In order to achieve the above purpose, the invention adopts the following technical scheme that the liquefied natural gas sampling and continuous collecting device is characterized by comprising:
the sampling system comprises an LNG sampling probe, and a closed cryogenic cavity is formed at the front end of the LNG sampling probe; the sampling pipeline is arranged in the LNG sampling probe in a penetrating way; the LNG liquid filling pipeline is arranged in the LNG sampling probe in a penetrating way and is communicated with the closed cryogenic cavity;
one end of the sampling pipeline passes through the closed cryogenic cavity to be connected with the gasification system, and the gasification system is used for gasifying the LNG sample conveyed by the sampling pipeline;
the online analysis system is connected with the outlet of the gasification system and is used for carrying out online analysis on the gasified natural gas sample and providing gas component parameters;
and the continuous collection system is connected with the outlet of the gasification system and is used for continuously collecting gasified natural gas samples.
Preferably, the closed cryogenic cavity is of a high-vacuum multi-layer heat-insulating cavity structure and comprises an inner cavity and an outer cavity which are made of stainless steel low-temperature resistant materials and a high-vacuum heat-insulating interlayer arranged between the inner cavity and the outer cavity; the high vacuum heat insulation interlayer comprises aluminum foil, glass fiber paper and glass fiber belts which are sequentially distributed from inside to outside; carbon paper is also arranged in the high vacuum heat insulation interlayerA hydrogen scavenger and an adsorbent; the thickness of the interlayer is 10mm, and the vacuum degree of the high vacuum heat insulation interlayer is 10 -3 Pa。
Preferably, the continuous collection system comprises:
the elastic leather bag gas storage container comprises an outer tank, an elastic leather bag arranged in the outer tank, and a closed storage cavity formed between the outer tank and the elastic leather bag; an opening communicated with the closed storage cavity is reserved at the bottom of the elastic leather bag gas storage container, and the opening is respectively communicated with the gasification system and the sample steel bottle filling system through pipelines; the top of the elastic leather bag is provided with an opening, the opening is communicated with one interface of the three-way valve, and the other two interfaces of the three-way valve are respectively connected with an instrument air source and a discharge system.
Preferably, the system further comprises a BOG discharge system, wherein the closed cryogenic cavity, the gasification system, the online analysis system and the sample steel bottle filling system are all connected with the BOG discharge system through pipelines, and the BOG discharge system is connected with a BOG main pipe through pipelines.
Preferably, the LNG sampling probe, the closed cryogenic cavity and the gasification system are integrated in an independent closed vacuum environment, the gasification system and the closed cryogenic cavity are distributed adjacently up and down, and the LNG sampling probe is wholly in a low-temperature environment.
Preferably, a self-operated pressure regulating valve is arranged on the closed cryogenic cavity and is connected with the BOG discharge system through a pipeline, and an electric tracing band is wrapped on the pipeline between the self-operated pressure regulating valve and the BOG discharge system; and a safety relief valve is arranged on the closed cryogenic cavity and is connected with the BOG discharge system through a pipeline.
Preferably, a first automatic shut-off valve for controlling the shut-off of the sampling pipeline is arranged on the LNG sampling probe, a second automatic shut-off valve for controlling the shut-off of the LNG liquid filling pipeline is arranged on the LNG sampling probe, and a temperature detection element is arranged at the outlet of the second automatic shut-off valve.
Preferably, sleeves are covered outside the first automatic shut-off valve and the second automatic shut-off valve, stainless steel sleeves are arranged on extension valve rods of the first automatic shut-off valve and the second automatic shut-off valve, the stainless steel sleeves are integrally welded with a valve cover, a vacuum structure is formed between the sleeves and the stainless steel sleeves, and the vacuum structure is communicated with a high-vacuum heat insulation interlayer of the closed cryogenic cavity.
Preferably, the gasification system comprises a temperature detection element, a regulating valve and a gasifier, and the sampling pipeline is connected with an inlet of the gasifier through the temperature detection element and the regulating valve; the gasifier adopts an electric heating gasifier; the online analysis system includes an online chromatograph.
Preferably, the outer tank is made of stainless steel, and the bearing pressure is at least 10MPa; the elastic leather bag is made of high-elasticity rubber, and can at least bear more than 50000 times of inflation and deflation operations; the elastic leather bag and the outer tank are sealed by adopting a multiple O-shaped elastic sealing ring;
a metering control device is arranged on a pipeline between the gasification system and the elastic leather bag gas storage container;
a pressure gauge is arranged at the opening of the elastic leather bag;
the device also comprises a vacuum pump, wherein the vacuum pump is respectively connected with the closed storage cavity of the elastic leather bag gas storage container and the sample steel bottle filling system through pipelines.
The invention adopts the technical proposal, and has the following advantages:
1. according to the LNG sampling probe, the cryogenic cavity is arranged at the front end of the LNG sampling probe, LNG in a sampling pipeline is subjected to cryogenic treatment by taking LNG as a refrigerant, fractionation of LNG before gasification is avoided, and the probe is especially subjected to bottom or side mounting aiming at the working condition of low supercooling degree (low LNG sampling pressure), so that samples of various low-pressure working conditions can be sampled, the problem that the existing product cannot work under too low pressure is solved, the LNG can be effectively restrained from being gasified in advance, and representative samples are ensured to be obtained.
2. According to the invention, the automatic pressure relief and safety pressure relief device is arranged at the upper part of the closed cryogenic cavity, so that the normal emission of evaporated gas after LNG refrigerant absorbs the heat of the LNG sampling pipeline is ensured, and the reliability and safety of the cryogenic treatment process are ensured.
3. The automatic shutoff valves on the sampling pipeline and the LNG liquid filling pipeline are all designed in an integrated vacuum way. The stainless steel sleeve is arranged on the extension valve rod of the low-temperature valve and is integrally welded with the valve cover, a vacuum structure is formed between the sleeve and the outer sleeve, the LNG valve is subjected to vacuum cold insulation, meanwhile, the valve is convenient to maintain on line, and the vacuum structure is not required to be damaged.
4. The closed cryogenic cavity adopts an integrated vacuum design, so that the LNG in the cavity is subjected to cold insulation and heat insulation, and meanwhile, the cryogenic cavity and the gasification system are ensured to be subjected to heat insulation, and cold and heat convection is prevented.
5. The invention develops a brand new elastic leather bag gas storage container, and realizes automatic collection and filling of samples by utilizing the back pressure matching provided by an instrument gas source and an elastic leather bag with built-in rubber materials; compared with the prior art, the elastic air bag air storage tank utilizes the self elasticity, can ensure the stability and smoothness of sample injection and sample discharge, and avoids the phenomena of friction blocking, non-uniform sample injection and air leakage caused by adding redundant elements; the method provides a more stable and reliable collection mode with controllable rate for continuously collecting samples, and meets the standard requirement of continuous sampling on continuous and stable sample injection of samples.
6. The invention relates to a complete LNG continuous sampling analysis device from sampling to component analysis (online analysis and offline analysis), which is widely applicable to LNG sampling analysis under various working conditions and can be widely applied to all facilities in an LNG industry chain, which need to be used for analyzing LNG components and calculating heat values.
7. The invention develops a novel sampling probe structure which adapts to on-site sampling pressure fluctuation, improves the compactness and the operation convenience of the LNG sampling probe and has adaptability to different sampling pressures.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic diagram of the structure of the sampling system and gasification system of the present invention;
fig. 3 is a schematic structural view of the elastic bladder air container of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the attached drawings, so that the objects, features and advantages of the present invention will be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the invention, but rather are merely illustrative of the true spirit of the invention.
As shown in fig. 1, an embodiment of the present invention provides a liquefied natural gas sampling and continuous collection apparatus, comprising: the sampling system 1 comprises an LNG sampling probe 11, and a closed cryogenic cavity 12 is formed at the front end of the LNG sampling probe 11; a sampling line 13 penetrating the LNG sampling probe 11; the LNG liquid filling pipeline 14 is arranged in the LNG sampling probe 11 in a penetrating way and is communicated with the closed cryogenic cavity 12;
one end of the sampling pipeline 13 passes through the closed cryogenic cavity 12 and is connected with the gasification system 2, and the gasification system 2 is used for gasifying the LNG sample conveyed by the sampling pipeline 13;
the online analysis system 3 is connected with the outlet of the gasification system 2 and is used for carrying out online analysis on the gasified natural gas sample and providing gas component parameters;
and the continuous collection system 4 is connected with the outlet of the gasification system 2 and is used for continuously collecting gasified natural gas samples.
In use, the LNG sampling probe 11 is connected at one end to a pipeline or vessel (such as an LNG unloading manifold, a tank truck loading manifold, etc.) requiring component analysis through a flange. LNG liquid filling pipeline 14 guides LNG to enter airtight cryogenic cavity 12, LNG in airtight cryogenic cavity 12 gasifies the heat absorption, carries out cryogenic treatment on sampling pipeline 13 located in airtight cryogenic cavity 12, improves the supercooling degree of LNG sample before entering gasification system 2, prevents gasification in advance, overcomes the restriction of sampling pressure in the prior art, can be suitable for multiple sampling pressure. The LNG sampling probe, the gasification system, the online analysis system and the continuous collection system form a complete LNG continuous sampling analysis and collection device from sampling to component analysis (online analysis and offline analysis), are widely applicable to LNG sampling analysis under various working conditions, and can be widely applied to all facilities in an LNG industry chain, which need to be used for analyzing LNG components and calculating heat values.
In the above embodiment, preferably, the present invention further includes a BOG discharging system 5, a closed cryogenic cavity 12, a gasification system 2, an on-line analysis system 3 and a continuous collection system 4, all of which are connected to the BOG discharging system 5 through pipelines, and the BOG discharging system 5 is connected to a BOG header pipe (not shown in the figure) through pipelines, so as to return the residual LNG samples and BOG gas generated in the gasification system 2, the on-line analysis system 3 and the continuous collection system 4 to the BOG header pipe in the closed cryogenic cavity 12.
In the above embodiment, the sealed cryogenic cavity 12 is preferably a high-vacuum multi-layer heat-insulating cavity structure, which includes an inner cavity and an outer cavity made of stainless steel low-temperature resistant material, and a high-vacuum heat-insulating interlayer disposed between the inner cavity and the outer cavity, so that the effects of heat conduction, heat convection and heat radiation are effectively blocked. The high vacuum heat insulation interlayer comprises aluminum foil, glass fiber paper and glass fiber belts which are repeatedly wound in sequence from inside to outside; aluminum foil is used to reduce radiative heat transfer; the glass fiber paper is used for establishing a multi-layer material interval reflecting screen to reduce heat conduction; the glass fiber tape is used for fixing the multi-layer materials, preventing the multi-layer materials from falling off, and ensuring the firmness and safety of the heat insulation interlayer. And meanwhile, winding carbon paper to adsorb other gases released by the multi-layer material, so as to maintain the high vacuum of the interlayer. The long-term high vacuum in the interlayer of the cavity is maintained together by matching with the dehydrogenation agent and the adsorbent, the thickness of the interlayer is about 10mm, and the vacuum degree is about 10 -3 Pa is far higher than the vacuum degree of the existing similar products. The closed cryogenic cavity 12 not only ensures that the temperature of LNG in the cavity is basically consistent with the temperature of a sampling point in a vacuum environment with extremely low heat leakage rate, but also plays a role in absorbing the heat of the sampling pipeline. In the lowest evaporation loss range of the inner tube of the cavity, once LNG is gasified, the heat of the sampling pipeline can be absorbed, and a larger supercooling degree is provided. In addition, due to the high-vacuum multi-layer heat insulation structure of the closed cryogenic cavity 12, the cryogenic environment in the closed cryogenic cavity 12 is isolated from the heating environment in the gasification system 2, so that cold energy transmission is avoided, and LNG samples are effectively prevented from being gasified in advance.
In the above embodiment, as shown in fig. 2, it is preferable that the LNG sampling probe 11, the sealed cryogenic cavity 12 and the gasification system 2 are integrated in a single closed vacuum environment, the gasification system 2 and the sealed cryogenic cavity 12 are distributed adjacently up and down, and the LNG sampling probe 1 is in a low temperature environment as a whole. When the device is used, LNG is firstly taken out from a sampling main pipeline (a pipeline or a container needing component analysis), is guided into the closed cryogenic cavity 12 through the LNG filling pipeline 14, pre-cooling protection is carried out on the sampling pipeline 13, heat is absorbed, the supercooling degree of the LNG before entering the gasification system 2 is improved, and early gasification is prevented. The gasification system 2 provides a heating medium environment to realize the full rapid gasification of the LNG.
In the above embodiment, it is preferable that the self-operated pressure regulating valve 6 is disposed on the sealed cryogenic cavity 12, the self-operated pressure regulating valve 6 is connected with the BOG discharge system 5 through a pipeline, when the LNG in the sealed cryogenic cavity 12 absorbs heat and gasifies, the pressure in the cavity rises, and when the pressure reaches the set pressure, the self-operated pressure regulating valve 6 is opened, and the BOG gas generated in the sealed cryogenic cavity 12 is discharged into the BOG discharge system 5; an electric tracing band 7 is wrapped on a pipeline between the self-operated pressure regulating valve 6 and the BOG discharge system 5, and the electric tracing band 7 heats the discharged gas to ensure that the medium entering the BOG discharge system 5 is gaseous natural gas. The safety relief valve 8 is arranged on the closed cryogenic cavity 12, the safety relief valve 8 is connected with the BOG discharge system 5 through a pipeline, overpressure in the closed cryogenic cavity 12 is prevented, and when abnormal gasification occurs in the LNG closed cryogenic cavity 12, the BOG in the closed cryogenic cavity 12 is safely relieved to the BOG discharge system 5 through the safety relief valve 8.
In the above embodiment, it is preferable that the LNG sampling probe 11 is provided with a first automatic shut-off valve 15 for controlling the shut-off of the sampling line 13, the LNG sampling probe 11 is provided with a second automatic shut-off valve 16 for controlling the shut-off of the LNG filling line 14, and a temperature detecting element 17 is provided at the outlet of the second automatic shut-off valve 16 for monitoring the temperature of the LNG entering the closed cryogenic cavity 12, so as to adjust the opening of the second automatic shut-off valve 16, and the first automatic shut-off valve 15 is opened to sample the LNG after the pre-cooling temperature is reached.
In the above embodiment, preferably, the first automatic shut-off valve 15 and the second automatic shut-off valve 16 are all in an integrated vacuum design, the outside of the first automatic shut-off valve 15 and the second automatic shut-off valve 16 is covered with a sleeve, the extending valve rods of the first automatic shut-off valve 15 and the second automatic shut-off valve 16 are all provided with stainless steel sleeves, the stainless steel sleeves are integrally welded with a valve cover, a vacuum structure is formed between the stainless steel sleeves and the sleeve, and the vacuum structure is communicated with a high vacuum heat insulation interlayer of the closed cryogenic cavity 12 for integrated vacuumizing treatment. The structure is also convenient for the on-line maintenance of the automatic valve, and the upper valve cover and the above elements of the valve can be maintained through the stainless steel sleeve without damaging the vacuum environment outside the sleeve.
In the above embodiment, it is preferable that the temperature detecting element 17 be a temperature transmitter.
In the above embodiment, it is preferable that the vaporizing system 2 includes the temperature detecting element 21, the regulating valve 22, and the vaporizer 23, and the sampling line 13 is connected to the inlet of the vaporizer 23 through the temperature detecting element 21 and the regulating valve 22. The vaporizer 23 may be an electrically heated vaporizer.
In the above embodiment, it is preferable that the on-line analysis system 3 includes an on-line chromatograph for on-line analyzing the components of the gasified LNG.
In the above embodiment, preferably, as shown in fig. 1 and 3, the continuous collection system 4 includes:
the elastic leather bag gas storage container 41 comprises an outer tank 411 and an elastic leather bag 412 arranged in the outer tank 411, a closed storage cavity 413 is formed between the outer tank 411 and the elastic leather bag 412, an opening communicated with the closed storage cavity 413 is reserved at the bottom of the elastic leather bag gas storage container 41, the opening is respectively communicated with the gasification system 2 and the sample steel bottle filling system 42 through pipelines, and the sample steel bottle filling system 42 is connected with the BOG discharge system 5 through pipelines; the top of the elastic leather bag 412 arranged in the elastic leather bag gas storage container 41 is provided with an opening, the opening is communicated with one interface of the three-way valve 43, the other two interfaces of the three-way valve are respectively connected with the instrument gas source 44 and the discharge system 45, and the air inlet and the air discharge in the elastic leather bag 412 are realized through the interface switching of the three-way valve.
When the device is used, when the elastic leather bag 412 exhausts air to the exhaust system 45, the natural gas sample in the gasification system 2 is filled into the sealed storage cavity 413, the exhaust pressure is adjusted through the exhaust system 45 to change the sample collection rate, and the sample injection is ensured to be stable and reliable, and the uniform speed is controllable. When the instrument air source 44 inflates the elastic bellows 412, the elastic bellows 412 expands and the air in the sealed storage chamber 413 is compressed and inflated into the sample cylinder filling system 42 for off-line analysis.
In the above embodiment, it is preferable that a metering control device 46 is provided on the line between the gasification system 2 and the elastic bellows gas container 41 to regulate the flow rate of the gas sample, and a pressure gauge 47 is provided at the opening of the elastic bellows 412.
In the above embodiment, it is preferable that the continuous collection system 4 further includes a vacuum pump 48, and the vacuum pump 48 is connected to the closed storage chamber 413 of the elastic bellows gas container 41 and the sample cylinder filling system 42 via pipelines, respectively, for evacuating the closed storage chamber 413 and the sample cylinder filling system 42. Before the natural gas sample starts to be filled into the sealed storage cavity 413, namely, when the leather bag is in a state of being filled with instrument gas, the vacuum pump 48 is started to pump residual sample gas in the sealed storage cavity 413, so that no last sampled sample remains.
In the above embodiment, the outer tank 411 is preferably made of stainless steel, and has a bearing pressure of at least 10MPa, and the elastic bellows 412 is made of high-elasticity rubber, and can withstand at least 50000 times of inflation and deflation operations. The elastic leather bag 412 and the outer tank 411 are sealed by adopting multiple O-shaped elastic sealing rings, so that the isolation and sealing effects are realized, and the mixing of a natural gas sample and an instrument gas source filled in the leather bag is prevented.
Because the demand for LNG components (including LNG calorific value measurement) is increasingly wide, the device comprehensively considers the special demands of land and sea working conditions in the aspects of structural design, material selection, operation maintenance and the like. The sampling may be performed at-130 degrees celsius. The LNG sampling device can be suitable for LNG sampling under various operating pressure working conditions by adjusting the installation angle.
The present invention has been described with reference to the above embodiments, and the structure, arrangement and connection of the components may be varied. On the basis of the technical scheme, the improvement or equivalent transformation of the individual components according to the principles of the invention should not be excluded from the protection scope of the invention.
Claims (6)
1. A liquefied natural gas sampling and continuous collection device, comprising:
the sampling system (1) comprises an LNG sampling probe (11), and a closed cryogenic cavity (12) is formed at the front end of the LNG sampling probe (11); a sampling pipeline (13) is arranged in the LNG sampling probe (11) in a penetrating way; the LNG liquid filling pipeline (14) is arranged in the LNG sampling probe (11) in a penetrating way and is communicated with the closed cryogenic cavity (12);
one end of the sampling pipeline (13) passes through the closed cryogenic cavity (12) to be connected with the gasification system (2), and the gasification system (2) is used for gasifying LNG samples conveyed by the sampling pipeline (13);
the online analysis system (3) is connected with the outlet of the gasification system (2) and is used for carrying out online analysis on the gasified natural gas sample and providing gas component parameters;
the continuous collection system (4) is connected with the outlet of the gasification system (2) and is used for continuously collecting gasified natural gas samples;
the closed cryogenic cavity (12) is of a high-vacuum multi-layer heat-insulating cavity structure and comprises an inner cavity and an outer cavity which are made of stainless steel low-temperature resistant materials, and a high-vacuum heat-insulating interlayer arranged between the inner cavity and the outer cavity; the high vacuum heat insulation interlayer comprises aluminum foil, glass fiber paper and glass fiber belts which are sequentially distributed from inside to outside; carbon paper, a dehydrogenation agent and an adsorbent are also arranged in the high vacuum heat insulation interlayer; the thickness of the interlayer is 10mm, and the vacuum degree of the high vacuum heat insulation interlayer is 10 -3 Pa；
The continuous collection system (4) comprises:
an elastic leather bag gas storage container (41) comprising an outer tank (411), an elastic leather bag (412) arranged in the outer tank (411), and a closed storage cavity (413) formed between the outer tank (411) and the elastic leather bag (412); an opening communicated with the closed storage cavity (413) is reserved at the bottom of the elastic leather bag gas storage container (41), and the opening is respectively communicated with the gasification system (2) and the sample steel bottle filling system (42) through pipelines; an opening is formed in the top of the elastic leather bag (412), the opening is communicated with one interface of the three-way valve (43), and the other two interfaces of the three-way valve (43) are respectively connected with an instrument air source (44) and a discharge system (45);
the LNG sampling probe (11), the closed cryogenic cavity (12) and the gasification system (2) are integrated in an independent closed vacuum environment, the gasification system (2) and the closed cryogenic cavity (12) are distributed adjacently up and down, and the whole LNG sampling probe (11) is in a low-temperature environment;
the gasification system (2) comprises a temperature detection element, a regulating valve (22) and a gasifier (23), wherein the sampling pipeline (13) is connected with an inlet of the gasifier (23) through the temperature detection element and the regulating valve (22); the gasifier (23) is an electrically heated gasifier; the online analysis system (3) comprises an online chromatograph.
2. The lng sampling and continuous collection device of claim 1, wherein: the system also comprises a BOG discharge system (5), wherein the closed cryogenic cavity (12), the gasification system (2), the online analysis system (3) and the sample steel cylinder filling system (42) are connected with the BOG discharge system (5) through pipelines, and the BOG discharge system (5) is connected with a BOG main pipe through the pipelines.
3. The lng sampling and continuous collection device of claim 2, wherein: a self-operated pressure regulating valve (6) is arranged on the closed cryogenic cavity (12), the self-operated pressure regulating valve (6) is connected with the BOG discharge system (5) through a pipeline, and an electric tracing band (7) is wrapped on the pipeline between the self-operated pressure regulating valve (6) and the BOG discharge system (5); and a safety relief valve (8) is arranged on the closed cryogenic cavity (12), and the safety relief valve (8) is connected with the BOG discharge system (5) through a pipeline.
4. The lng sampling and continuous collection device of claim 1, wherein: the LNG sampling probe (11) is provided with a first automatic shutoff valve (15) for controlling the shutoff of the sampling pipeline (13), the LNG sampling probe (11) is provided with a second automatic shutoff valve (16) for controlling the shutoff of the LNG liquid filling pipeline (14), and the outlet of the second automatic shutoff valve (16) is provided with a temperature detection element.
5. The lng sampling and continuous collection device of claim 4 wherein: the sleeve is covered outside the first automatic shut-off valve (15) and the second automatic shut-off valve (16), stainless steel sleeves are arranged on extension valve rods of the first automatic shut-off valve (15) and the second automatic shut-off valve (16), the stainless steel sleeves are integrally welded with a valve cover, a vacuum structure is formed between the sleeve and the stainless steel sleeves, and the vacuum structure is communicated with a high-vacuum heat insulation interlayer of the closed cryogenic cavity (12).
6. The lng sampling and continuous collection device of claim 1, wherein: the outer tank (411) is made of stainless steel, and the bearing pressure is at least 10MPa; the elastic leather bag (412) is made of high-elasticity rubber, and can at least bear more than 50000 times of inflation and deflation operations; the elastic leather bag (412) and the outer tank (411) are sealed by adopting multiple O-shaped elastic sealing rings;
a metering control device (46) is arranged on a pipeline between the gasification system (2) and the elastic leather bag gas storage container (41);
a pressure gauge (47) is arranged at the opening of the elastic leather bag (412);
the device also comprises a vacuum pump (48), wherein the vacuum pump (48) is respectively connected with the airtight storage cavity (413) of the elastic leather bag gas storage container (41) and the sample steel bottle filling system (42) through pipelines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910418648.3A CN110045041B (en) | 2019-05-20 | 2019-05-20 | Liquefied natural gas sampling and continuous collecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910418648.3A CN110045041B (en) | 2019-05-20 | 2019-05-20 | Liquefied natural gas sampling and continuous collecting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110045041A CN110045041A (en) | 2019-07-23 |
| CN110045041B true CN110045041B (en) | 2024-02-06 |
Family
ID=67282702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910418648.3A Active CN110045041B (en) | 2019-05-20 | 2019-05-20 | Liquefied natural gas sampling and continuous collecting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110045041B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109945596B (en) * | 2019-03-05 | 2024-01-16 | 中国工程物理研究院激光聚变研究中心 | Temperature gradient type low-temperature environment preparation device |
| CN110824078B (en) * | 2019-09-24 | 2020-12-08 | 合肥工业大学 | Temperature-controllable trace high-purity liquid sample evaporation device |
| KR20220103179A (en) * | 2019-11-27 | 2022-07-21 | 시너텍 피티와이 리미티드 | Systems and methods for evaporating liquefied natural gas for measurement of liquefied natural gas |
| CN111720734B (en) * | 2020-06-08 | 2021-09-03 | 江苏国富氢能技术装备股份有限公司 | Sampling system on liquid hydrogen storage tank |
| CN111721895A (en) * | 2020-07-21 | 2020-09-29 | 张家港盈达气体有限公司 | Automatic gas sampling and analyzing device |
| CN113567201A (en) * | 2021-06-09 | 2021-10-29 | 青岛海关技术中心 | Low temperature liquefied natural gas sample sampling device |
| WO2023197196A1 (en) * | 2022-04-13 | 2023-10-19 | 中海石油气电集团有限责任公司 | High-compactness lng sampling and gasifying device having self-adaptive function |
| CN114877260B (en) * | 2022-04-13 | 2024-03-08 | 中海石油气电集团有限责任公司 | High compact LNG sampling gasification device with self-adaptation function |
| CN114777011A (en) * | 2022-04-20 | 2022-07-22 | 中国石油化工股份有限公司 | Multifunctional fair metering system and metering method based on LNG tank car |
| CN116718438B (en) * | 2023-08-07 | 2023-10-27 | 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 |
| CN116818428B (en) * | 2023-08-29 | 2023-11-10 | 苏州杜尔气体化工装备有限公司 | Low-temperature liquefied natural gas sample extraction device for natural gas gasification station |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013170873A (en) * | 2012-02-20 | 2013-09-02 | Tokyo Gas Co Ltd | System for measuring liquid composition by raman spectroscopic analysis |
| CN204493998U (en) * | 2015-03-25 | 2015-07-22 | 中海福建天然气有限责任公司 | The online cold insulation structure of a kind of LNG sample |
| CN106290805A (en) * | 2016-08-04 | 2017-01-04 | 浙江海洋大学 | LNG groove tank car liquid impurities content multi-parameter monitoring devices and monitoring method thereof |
| CN106525491A (en) * | 2016-11-14 | 2017-03-22 | 成都安迪生测量有限公司 | Sampling probe of sampling device |
| CN107831049A (en) * | 2017-12-06 | 2018-03-23 | 中海石油气电集团有限责任公司 | Intermittent sampling analytical equipment and its application method are used in a kind of LNG handling |
| CN109115564A (en) * | 2017-06-26 | 2019-01-01 | 中国石油天然气股份有限公司 | A kind of natural gas sampler and method |
| CN210005498U (en) * | 2019-05-20 | 2020-01-31 | 中海石油气电集团有限责任公司 | Liquefied natural gas sampling and continuous collecting device |
-
2019
- 2019-05-20 CN CN201910418648.3A patent/CN110045041B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013170873A (en) * | 2012-02-20 | 2013-09-02 | Tokyo Gas Co Ltd | System for measuring liquid composition by raman spectroscopic analysis |
| CN204493998U (en) * | 2015-03-25 | 2015-07-22 | 中海福建天然气有限责任公司 | The online cold insulation structure of a kind of LNG sample |
| CN106290805A (en) * | 2016-08-04 | 2017-01-04 | 浙江海洋大学 | LNG groove tank car liquid impurities content multi-parameter monitoring devices and monitoring method thereof |
| CN106525491A (en) * | 2016-11-14 | 2017-03-22 | 成都安迪生测量有限公司 | Sampling probe of sampling device |
| CN109115564A (en) * | 2017-06-26 | 2019-01-01 | 中国石油天然气股份有限公司 | A kind of natural gas sampler and method |
| CN107831049A (en) * | 2017-12-06 | 2018-03-23 | 中海石油气电集团有限责任公司 | Intermittent sampling analytical equipment and its application method are used in a kind of LNG handling |
| CN210005498U (en) * | 2019-05-20 | 2020-01-31 | 中海石油气电集团有限责任公司 | Liquefied natural gas sampling and continuous collecting device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110045041A (en) | 2019-07-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110045041B (en) | Liquefied natural gas sampling and continuous collecting device | |
| CN108870821A (en) | It is a kind of using refrigeration machine as the sub-cooled equipment of cold source | |
| CN210005498U (en) | Liquefied natural gas sampling and continuous collecting device | |
| EP3951348B1 (en) | Cryogenic liquid composite sampling system and methods | |
| CN113227744B (en) | Method for checking the leak-tightness of a leak-proof and thermally insulated tank for storing a fluid | |
| CN105372404A (en) | Low-temperature gas explosion characteristic test method | |
| JP2022031216A (en) | Device and method for filling liquefied gas | |
| CN106248730B (en) | Test device for heat-insulating material performance detection | |
| CN105649952A (en) | Vacuum pipe evacuator and evacuating method thereof | |
| CN113640071A (en) | Low temperature liquefied natural gas sample sampling device | |
| CN113030151A (en) | Device and method for testing liquefaction rate of low-temperature gas liquefaction device | |
| CN205533072U (en) | Vacuum pipe evacuator | |
| CN102359860A (en) | Clean vacuum system for engine plume test study and vacuum pumping repressing method thereof | |
| CN112781934A (en) | Normal-temperature heterogeneous sample sampling and analyzing system and method | |
| CN110345378A (en) | A kind of experimental provision of the non-equilibrium gas-liquid two-phase pipeline flowing of test liquefied natural gas | |
| CN105489253B (en) | The freezing targeting system and its operating method studied for liquid deuterium state equation | |
| CN214621870U (en) | Normal-temperature heterogeneous sample sampling and analyzing system | |
| CN102797943A (en) | Vacuumizing technology for vacuum low-temperature thermal insulation pipeline | |
| CN210376204U (en) | Device for storing liquid helium and testing multilayer heat-insulating material under liquid helium temperature zone | |
| CN113567201A (en) | Low temperature liquefied natural gas sample sampling device | |
| CN111665039A (en) | Low-temperature safety valve test device | |
| CN101008467A (en) | High pressure gas container with an auxiliary valve and process for filling it | |
| CN110261099A (en) | A kind of Subzero valve intercooling cycle experimental system | |
| RU2804785C1 (en) | Tank car for storage and transportation of liquefied natural gas | |
| Pangelis et al. | Safety interlock and vent system to alleviate potentially dangerous ice blockage of top-loading cryostat sample sticks |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |