CN210005498U - Liquefied natural gas sampling and continuous collecting device - Google Patents
Liquefied natural gas sampling and continuous collecting device Download PDFInfo
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- CN210005498U CN210005498U CN201920722088.6U CN201920722088U CN210005498U CN 210005498 U CN210005498 U CN 210005498U CN 201920722088 U CN201920722088 U CN 201920722088U CN 210005498 U CN210005498 U CN 210005498U
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Abstract
The utility model discloses an liquefied natural gas sample and continuous collection device, including the sampling system, including LNG sampling probe the front end of LNG sampling probe forms airtight cryrogenic cavity, the sampling line wears to establish in the LNG sampling probe, LNG liquid filling line wear to establish in the LNG sampling probe and with airtight cryrogenic cavity intercommunication, gasification system, the end of sampling line passes airtight cryrogenic cavity with gasification system connects, gasification system is used for the gasification the LNG sample that the sampling line was carried, on-line analysis system, with gasification system's exit linkage, continuous collection system with gasification system's exit linkage for continuously collect the natural gas sample after the gasification.
Description
Technical Field
The utility model relates to an kind of liquefied natural gas sample and continuous collection device specifically are used with the cooperation of natural gas chromatography appearance, can be used to LNG component analysis (finally provide the heat value) application occasions such as LNG receiving station sign indicating number head trade handing-over, LNG tank wagon loading measurement, belong to LNG sample and analysis technical field.
Background
Because LNG is an ultra-low temperature liquid mixture (usually operating temperature is below-130 ℃), and is very easy to vaporize, the liquid is easy to produce rapid fractional vaporization of components under the influence of slight temperature and pressure changes, and a real flowing LNG sample capable of representing the ratio of the liquid mixture in a pipeline is obtained before vaporization, so that the LNG sample is required to be kept in a supercooled state before vaporization, and any component is not required to be fractionally vaporized, and the ratio of the gas component mixture ratio to the liquid component ratio is completely after vaporization so as to ensure that the result of a gas chromatograph is consistent with the sample liquid component , meet the requirement of handover, meet the standard requirements of metering precision, trade repeatability and the like, and avoid excessive economic loss.
The following describes possible deficiencies of the existing technology in terms of the above two aspects:
SquareIn one aspect, LNG is passed from a sampling point to an LNG vaporizer through a sampling probe, the thermal insulation properties of which are a prerequisite for obtaining a representative sample. In the prior art, composite heat insulation materials, vacuum heat insulation or a combination scheme of the composite heat insulation materials and the vacuum heat insulation are adopted, and the cold insulation effect is generally considered to be better by adopting the vacuum heat insulation. However, despite the high level of vacuum insulation design in the industry (10)-4Pa) can not avoid the heat leakage phenomenon generated by heat radiation, and the design level of the vacuum heat insulation of the LNG sampling probe applied in the reality is far lower than 10-4Pa. there is also a patent that the LNG is controlled to be in a supercritical state before being heated in the vaporizer to achieve complete phase transition of the LNG in a supercritical ideal state and avoid fractionation of components, wherein the method requires strict control of the LNG to be above a supercritical pressure, and requires precise design of a structural size to achieve an ideal phase transition effect, denier sampling point pressure is changed, and if the setting of a pressure control element cannot be adjusted, a preset sampling flow and pressure may be changed to disable the supercritical phase transition process.
In addition, , the continuous sampling process needs to set a sample gas storage tank for collecting the natural gas sample during the whole sampling period and then conveying the natural gas sample to the sampling steel cylinder after collection, the structure design of the gas storage tank should ensure no loss sampling in the whole process, no component residue of the previous sampling and no gas leakage, while the existing collection device mostly adopts a single pressure container design, which has the problems of uneven sample mixing and filling, or adopts a pressure container design with mechanical parts, which is easy to generate the problems of friction jam of moving parts, uneven sample feeding or gas leakage.
Disclosure of Invention
To the problem, the utility model aims at providing kinds of liquefied natural gas sample and continuous collection device, can adapt to multiple sample pressure, effectively restrain the LNG sample and gasify in advance, can ensure the whole collection of sample reliable and stable simultaneously.
In order to achieve the above object, the utility model discloses a following technical scheme, kinds of liquefied natural gas sample and continuous collection device, a serial communication port, include:
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 mode; the LNG liquid filling pipeline penetrates through the LNG sampling probe and is communicated with the closed cryogenic cavity;
the end of the sampling pipeline penetrates 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 an outlet of the gasification system;
and the continuous collection system is connected with the outlet of the gasification system and is used for continuously collecting the gasified natural gas sample.
Preferably, the closed cryogenic cavity is a high-vacuum multi-layer heat-insulation 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-insulation interlayer arranged between the inner cavity and the outer cavity; the high vacuum heat insulation interlayer comprises an aluminum foil, glass fiber paper and a glass fiber tape 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 10-3Pa。
Preferably, the continuous collection system comprises:
the elastic leather bag gas storage container comprises an outer tank and an elastic leather bag arranged in the outer tank, a sealed storage cavity is formed between the outer tank and the elastic leather bag, an opening communicated with the sealed storage cavity is reserved at the bottom of the elastic leather bag gas storage container and is respectively communicated with a gasification system and a sample steel bottle filling system through pipelines, an opening is arranged at the top of the elastic leather bag and is communicated with an interface of a three-way valve, and the other two interfaces of the three-way valve are respectively connected with an instrument gas source and a discharge system.
Preferably, still include BOG discharge system, airtight cryrogenic cavity, gasification system, online analytic system and sample steel bottle filling system all is connected with BOG discharge system through the pipeline, BOG discharge system passes through the pipeline and is connected with BOG house steward.
Preferably, LNG sampling probe, airtight cryrogenic cavity and gasification system integration are in independent inclosed vacuum environment, gasification system with airtight cryrogenic cavity is adjacent distribution from top to bottom, and LNG sampling probe is whole to be in low temperature environment.
Preferably, a self-operated pressure regulating valve is arranged on the closed deep cooling cavity and 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 deep cooling cavity and is connected with the BOG discharge system through a pipeline.
Preferably, an th automatic shutoff valve for controlling the shutoff of the sampling pipeline is arranged on the LNG sampling probe, a second automatic shutoff valve for controlling the shutoff of the LNG liquid filling pipeline is arranged on the LNG sampling probe, and a temperature detection element is arranged at an outlet of the second automatic shutoff valve.
Preferably, is in the outside cover of automatic shutoff valve and second automatic shutoff valve puts the sleeve is all installed stainless steel sleeve on the extension valve rod of automatic shutoff valve and second automatic shutoff valve, and stainless steel sleeve and valve gap integral weld, form the vacuum structure between sleeve and the stainless steel sleeve, the vacuum structure with the high vacuum heat insulation intermediate layer intercommunication of airtight deep cooling cavity.
Preferably, the gasification system comprises a temperature detection element, a regulating valve and a gasifier, and the sampling line 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 bears pressure of at least 10 MPa; the elastic leather bag is made of high-elasticity rubber and can bear more than 50000 times of inflation and deflation operation at least; multiple O-shaped elastic sealing rings are adopted between the elastic leather bag and the outer tank for sealing;
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 vacuum pump is respectively connected with the sealed storage cavity of the elastic leather bag gas storage container and the sample steel bottle filling system through pipelines.
The utility model adopts the above technical scheme, it has following advantage:
1. the utility model discloses set up cryrogenic cavity at LNG sampling probe front end, utilize LNG to carry out cryrogenic processing as the refrigerant to the LNG in the sampling line, avoid LNG to take place to fractionate before gasification, especially to the lower (LNG sampling pressure is lower) operating mode of subcooling, carry out bottom or side direction installation to the probe, can realize the sample to various low pressure operating modes, overcome current product and cross the problem of unable work excessively at pressure to can effectively restrain LNG and gasify in advance, ensure to gain representative sample.
2. The utility model discloses set up automatic pressure release and safe pressure relief device on airtight cryrogenic cavity upper portion, ensure that the LNG refrigerant absorbs LNG sample line heat after, boil-off gas's normal emission ensures the reliable safety of cryogenic treatment technology simultaneously.
3. The utility model discloses the automatic shutoff valve on sample pipeline and LNG liquid filling pipeline all adopts integration vacuum design, installation stainless steel sleeve on low temperature valve 's extension valve rod, with valve gap integral weld, form vacuum structure between sleeve and the outer tube, also make things convenient for the online maintenance of valve when carrying out vacuum cold insulation to LNG valve , need not to destroy vacuum structure.
4. The utility model discloses an airtight cryrogenic cavity adopts integration vacuum design, not only carries out cold insulation to the LNG in the cavity and insulates against heat, ensures that cryrogenic cavity separates heat with gasification system simultaneously, prevents cold and hot convection.
5. The utility model discloses develop brand-new elasticity leather bag gas storage container, utilize the back pressure cooperation that the elasticity leather bag of built-in rubber materials and instrument air supply provided, realize the automatic collection and the dress that fills of sample, compared with the prior art, the elasticity gasbag gas storage tank utilizes self elasticity, can ensure to advance a kind and go out the stable smoothness of appearance, avoid increasing the friction bite that unnecessary component caused, the inhomogeneous advances kind and the emergence of gas leakage phenomenon, for collecting the sample in succession provide more steadily reliable, the controllable collection mode of speed, accord with the continuous sampling to the sample standard requirement of steadily advancing kind in succession.
6. The utility model discloses to develop kinds of novel sampling probe structures that adapt to on-the-spot sample pressure fluctuation, improve the compactedness and the simple operation nature of LNG sampling probe self to and the adaptability to different sampling pressure.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic diagram of the sampling system and the gasification system of the present invention;
fig. 3 is a schematic structural view of the elastic air storage container of the leather bag of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended as limitations on the scope of the invention, but are merely illustrative of the true spirit of the technical solution of the invention.
As shown in FIG. 1, the embodiment of the utility model provides an kinds of liquefied natural gas sampling and continuous collection devices, which comprises a sampling system 1, a sampling pipeline 13, an LNG liquid filling pipeline 14, a liquid level sensor and a liquid level sensor, wherein 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;
the 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 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 the continuous collection system 4 is connected with the outlet of the gasification system 2 and is used for continuously collecting the gasified natural gas sample.
The utility model discloses when using, LNG sampling probe 11 end is through flange joint to on the pipeline or the container that need the component analysis (such as LNG house steward of unloading and tank wagon loading house steward etc.) LNG filling line 14 guide LNG gets into in the airtight copious cooling cavity 12, LNG gasification heat absorption in the airtight copious cooling cavity 12, do cryogenic treatment to the sampling line 13 that lies in airtight copious cooling cavity 12, improve the super-cooled degree of LNG sample before getting into gasification system 2, prevent to gasify in advance, overcome the restriction of sampling pressure among the prior art, can be suitable for multiple sampling pressure LNG sampling probe, gasification system, online analysis system and continuous collection system constitute complete from the LNG continuous sampling analysis and the device of collecting of component analysis (online analysis and offline analysis) of taking a sample, general LNG sampling analysis who is applicable to various operating modes, can be applied to in the LNG industry chain in all needs are used for the facility of analysis LNG component and calculating the calorific value.
In the above embodiment, it is preferred, the utility model discloses still include BOG discharge system 5, airtight cryrogenic cavity 12, gasification system 2, online analysis system 3 and continuous collection system 4 all are connected with BOG discharge system 5 through the pipeline, and BOG discharge system 5 passes through the pipeline to be connected with BOG house steward (not shown in the figure) to gaseous the BOG that produces in the unnecessary LNG sample of gasification system 2, online analysis system 3 and continuous collection system 4 and the airtight cryrogenic cavity 12 returns to BOG house steward.
In the above embodiment, preferably, the sealed deep cooling cavity 12 is a high vacuum multi-layer heat insulation cavity structure, which includes an inner cavity and an outer cavity made of stainless steel low temperature resistant material, and a high vacuum heat insulation interlayer disposed between the inner cavity and the outer cavity, so as to effectively block the effects of heat conduction, heat convection and heat radiation. The high vacuum heat insulation interlayer comprises an aluminum foil, glass fiber paper and a glass fiber tape which are repeatedly wound from inside to outside in sequence; aluminum foil is used to reduce radiation heat transfer; the glass fiber paper is used for establishing a multi-layer material spacing reflecting screen to reduce heat conduction; the glass fiber tape is used for fixing the multilayer materials, so that the multilayer materials are prevented from falling off, and the firmness and the safety of the heat insulation interlayer are ensured. Meanwhile, the winding carbon paper absorbs other gases released by the multi-layer material, and high vacuum of the interlayer is maintained. The hydrogen removing agent and the adsorbent are matched to maintain long-term high vacuum in the interlayer of the cavity, the thickness of the interlayer is about 10mm, and the vacuum degree is about 10-3Pa, farThe sealed cryogenic cavity 12 not only ensures that the temperature of LNG in the cavity and the temperature of a sampling point are basically kept in a vacuum environment with extremely low heat leakage rate, but also plays a role in absorbing the heat of a sampling pipeline, in the lowest range of evaporation loss of the inner pipe of the cavity, denier LNG can absorb the heat of the sampling pipeline by gasifying, and a larger supercooling degree is provided.
In the above embodiment, preferably, as shown in fig. 2, the LNG sampling probe 11, the sealed cryogenic cavity 12 and the gasification system 2 are integrated in independent sealed vacuum environments, the gasification system 2 and the sealed cryogenic cavity 12 are distributed adjacently up and down, and the whole LNG sampling probe 11 is in a low-temperature environment, when the whole apparatus is used, firstly, LNG is taken out from a main sampling pipeline (a pipeline or a container which needs component analysis), and is guided to enter the sealed cryogenic cavity 12 through the LNG liquid filling pipeline 14, so as to pre-cool and protect the sampling pipeline 13, absorb heat, improve the degree of supercooling of the LNG before entering the gasification system 2, and prevent advanced gasification, and the gasification system 2 provides a heat medium environment, so as to realize total rapid gasification of the LNG.
In the above embodiment, preferably, the self-operated pressure regulating valve 6 is arranged 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 is gasified, the pressure in the cavity rises, and when the pressure reaches a set pressure, the self-operated pressure regulating valve 6 is opened to discharge the BOG gas generated in the sealed cryogenic cavity 12 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 released into the BOG discharge system 5 through the safety relief valve 8.
In the above embodiment, preferably, the LNG sampling probe 11 is provided with an th automatic shutoff valve 15 for controlling the shutoff of the sampling line 13, the LNG sampling probe 11 is provided with a second automatic shutoff valve 16 for controlling the shutoff of the LNG liquid filling line 14, and a temperature detection element 17 is provided at an outlet of the second automatic shutoff 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 shutoff valve 16, and after the precooling temperature is reached, the th automatic shutoff valve 15 is opened to sample the LNG.
In the above embodiment, preferably, the th automatic shutoff valve 15 and the second automatic shutoff valve 16 are both designed to be -body vacuum, sleeves are covered outside the th automatic shutoff valve 15 and the second automatic shutoff valve 16, stainless steel sleeves are mounted on extension valve stems of the th automatic shutoff valve 15 and the second automatic shutoff valve 16, the stainless steel sleeves are integrally welded with a valve cover, a vacuum structure is formed between the stainless steel sleeves and the sleeves, the vacuum structure is communicated with a high-vacuum heat insulation interlayer of the sealed cryogenic cavity 12, and -body vacuum pumping processing is performed.
In the above embodiment, preferably, the temperature detecting element 17 may employ a temperature transmitter.
In the above embodiment, it is preferable that the gasification system 2 includes the temperature detection element 21, the adjustment valve 22, and the gasifier 23, and the sampling line 13 is connected to the inlet of the gasifier 23 through the temperature detection element 21 and the adjustment 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 analyzing the composition of the vaporized LNG on line.
In the above embodiment, preferably, as shown in fig. 1 and 3, the continuous collecting 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 and is respectively communicated with a gasification system 2 and a sample steel bottle filling system 42 through pipelines, the sample steel bottle filling system 42 is connected with a BOG discharge system 5 through a pipeline, an opening is formed in the top of the elastic leather bag 412 arranged in the elastic leather bag gas storage container 41 and is communicated with an interface of a three-way valve 43, the other two interfaces of the three-way valve are respectively connected with an instrument gas source 44 and a discharge system 45, and gas inlet and gas outlet in the elastic leather bag 412 are realized through 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 in the closed storage cavity 413, and the exhaust pressure is adjusted through the exhaust system 45 to change the sample collection rate, so that the sample introduction is stable and reliable, and the uniform speed is controllable. When the instrument gas source 44 inflates the flexible bladder 412, the flexible bladder 412 expands and the gas in the sealed storage chamber 413 is squeezed and filled 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 in the line between the gasification system 2 and the air container 41 of the elastic bellows 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, the continuous collection system 4 preferably further comprises a vacuum pump 48, wherein the vacuum pump 48 is connected to the sealed storage chamber 413 of the flexible bladder gas storage container 41 and the sample cylinder filling system 42 through pipelines for performing a vacuum process on the sealed storage chamber 413 and the sample cylinder filling system 42, and before the sealed storage chamber 413 is filled with the natural gas sample, that is, the bladder is in a full meter gas state, the vacuum pump 48 is started to extract residual sample gas in the sealed storage chamber 413, so as to ensure that there are not times of sample samples.
In the above embodiment, preferably, the outer tank 411 is made of stainless steel and bears a pressure of at least 10MPa, and the elastic bladder 412 is made of high-elasticity rubber and can bear inflation and deflation operations for at least 50000 times. Adopt multiple O type elastic seal circle to seal between elasticity leather bag 412 and the outer jar 411, play the sealed effect of isolation, prevent that the instrument air supply that natural gas sample and leather bag fill from mixing.
Because the demand for LNG components (including LNG heat value metering) is increasingly , the device comprehensively considers the special requirements of land and sea working conditions in the aspects of structural design, material selection, operation and maintenance, can sample at minus 130 ℃, and can be suitable for LNG sampling of various operating pressure working conditions by adjusting the installation angle.
The present invention has been described only with reference to the above embodiments, and the structure, arrangement position and connection of the components may be changed. On the basis of the technical scheme of the utility model, the all sides according to the utility model discloses the principle is all not excluded to the improvement that individual part goes on or the transform of equivalence the utility model discloses a protection scope is outside.
Claims (10)
1, kind of liquefied natural gas sample and continuous collection device, its characterized in that includes:
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); the sampling pipeline (13) is arranged in the LNG sampling probe (11) in a penetrating mode; the LNG liquid filling pipeline (14) penetrates through the LNG sampling probe (11) and is communicated with the closed cryogenic cavity (12);
the end of the sampling pipeline (13) penetrates through the closed cryogenic cavity (12) to be connected with the gasification system (2), and the gasification system (2) is used for gasifying the LNG sample conveyed by the sampling pipeline (13);
an online analysis system (3) connected to an outlet of the gasification system (2);
and the continuous collection system (4) is connected with the outlet of the gasification system (2) and is used for continuously collecting the gasified natural gas sample.
2. The lng sampling and continuous collection apparatus of claim 1, wherein: the closed deep cooling cavity (12) is a high-vacuum multi-layer heat insulation cavity structure and comprises an inner cavity and an outer cavity which are made of stainless steel low-temperature-resistant materials and are arranged inside and outside the inner cavityA high vacuum heat insulation interlayer between the two layers; the high vacuum heat insulation interlayer comprises an aluminum foil, glass fiber paper and a glass fiber tape 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 10-3Pa。
3. The lng sampling and continuous collection device according to claim 1, wherein the continuous collection system (4) comprises:
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) in a built-in mode, a sealed storage cavity (413) is formed between the outer tank (411) and the elastic leather bag (412), an opening communicated with the sealed storage cavity (413) is reserved at the bottom of the elastic leather bag gas storage container (41) and 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) and is communicated with an interface of a three-way valve (43), and the other two interfaces of the three-way valve (43) are respectively connected with an instrument gas source (44) and a discharge system (45).
4. The lng sampling and continuous collection apparatus of claim 3, wherein: still include BOG discharge system (5), airtight cryrogenic cavity (12), gasification system (2), on-line analysis system (3) and sample steel bottle filling system (42) all are connected with BOG discharge system (5) through the pipeline, BOG discharge system (5) are connected through pipeline and BOG house steward.
5. The liquefied natural gas sampling and continuous collecting device according to claim 1, wherein the LNG sampling probe (11), the closed cryogenic cavity (12) and the gasification system (2) are integrated in independent closed vacuum environments, the gasification system (2) and the closed cryogenic cavity (12) are distributed adjacently up and down, and the LNG sampling probe (11) is entirely in a low-temperature environment.
6. The lng sampling and continuous collection apparatus of claim 4, wherein: a self-operated pressure regulating valve (6) is arranged on the closed deep cooling 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); set up safety relief valve (8) on airtight cryrogenic cavity (12), safety relief valve (8) pass through the pipeline with BOG discharge system (5) are connected.
7. The LNG sampling and continuous collection device according to claim 2, wherein the LNG sampling probe (11) is provided with an -th automatic shutoff valve (15) for controlling the shutoff of the sampling line (13), the LNG sampling probe (11) is provided with a second automatic shutoff valve (16) for controlling the shutoff of the LNG filling line (14), and a temperature detection element (17) is provided at an outlet of the second automatic shutoff valve (16).
8. The liquefied natural gas sampling and continuous collection device according to claim 7, wherein a sleeve is covered outside the th automatic shutoff valve (15) and the second automatic shutoff valve (16), stainless steel sleeves are respectively installed on the extension valve stems of the th automatic shutoff valve (15) and the second automatic shutoff valve (16) and 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 the high-vacuum heat insulation interlayer of the closed cryogenic cavity (12).
9. The lng sampling and continuous collection apparatus of claim 1, wherein: the gasification system (2) comprises a temperature detection element (21), a regulating valve (22) and a gasifier (23), and the sampling pipeline (13) is connected with an inlet of the gasifier (23) through the temperature detection element (21) and the regulating valve (22); the gasifier (23) adopts an electric heating gasifier; the online analysis system (3) comprises an online chromatograph.
10. The lng sampling and continuous collection apparatus of claim 3, wherein: the outer tank (411) is made of stainless steel and bears at least 10MPa of pressure; the elastic leather bag (412) is made of high-elasticity rubber and can 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 is characterized by further comprising a vacuum pump (48), wherein the vacuum pump (48) is respectively connected with the sealed storage cavity (413) of the elastic leather bag gas storage container (41) and the sample steel cylinder filling system (42) through pipelines.
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| CN201920722088.6U CN210005498U (en) | 2019-05-20 | 2019-05-20 | Liquefied natural gas sampling and continuous collecting device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110045041A (en) * | 2019-05-20 | 2019-07-23 | 中海石油气电集团有限责任公司 | Liquefied natural gas sampling and continuously trapping system |
| CN113777177A (en) * | 2020-06-09 | 2021-12-10 | 中国石油天然气股份有限公司 | Detection system and detection method for sulfur compounds in gas |
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2019
- 2019-05-20 CN CN201920722088.6U patent/CN210005498U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110045041A (en) * | 2019-05-20 | 2019-07-23 | 中海石油气电集团有限责任公司 | Liquefied natural gas sampling and continuously trapping system |
| CN110045041B (en) * | 2019-05-20 | 2024-02-06 | 中海石油气电集团有限责任公司 | Liquefied natural gas sampling and continuous collecting device |
| CN113777177A (en) * | 2020-06-09 | 2021-12-10 | 中国石油天然气股份有限公司 | Detection system and detection method for sulfur compounds in gas |
| CN113777177B (en) * | 2020-06-09 | 2024-03-26 | 中国石油天然气股份有限公司 | System and method for detecting sulfur compounds in gas |
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