CN111237629A - Marine natural gas storage tank - Google Patents
Marine natural gas storage tank Download PDFInfo
- Publication number
- CN111237629A CN111237629A CN201811437181.9A CN201811437181A CN111237629A CN 111237629 A CN111237629 A CN 111237629A CN 201811437181 A CN201811437181 A CN 201811437181A CN 111237629 A CN111237629 A CN 111237629A
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- China
- Prior art keywords
- leakage
- liquid outlet
- cavity
- natural gas
- storage tank
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 60
- 239000003345 natural gas Substances 0.000 title claims abstract description 30
- 238000003860 storage Methods 0.000 title claims abstract description 27
- 239000007788 liquid Substances 0.000 claims abstract description 79
- 239000011229 interlayer Substances 0.000 claims abstract description 31
- 239000011261 inert gas Substances 0.000 claims abstract description 22
- 230000009471 action Effects 0.000 claims abstract description 12
- 230000000149 penetrating effect Effects 0.000 claims abstract description 3
- 239000011810 insulating material Substances 0.000 claims description 17
- 230000000903 blocking effect Effects 0.000 claims description 13
- 239000012774 insulation material Substances 0.000 claims description 8
- 239000004576 sand Substances 0.000 claims description 7
- 239000000945 filler Substances 0.000 claims description 2
- 238000010079 rubber tapping Methods 0.000 claims 2
- 239000011324 bead Substances 0.000 claims 1
- 239000011152 fibreglass Substances 0.000 claims 1
- 239000007789 gas Substances 0.000 abstract description 19
- 239000003949 liquefied natural gas Substances 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 19
- 239000010935 stainless steel Substances 0.000 description 19
- 239000003365 glass fiber Substances 0.000 description 6
- 238000007789 sealing Methods 0.000 description 6
- 230000002265 prevention Effects 0.000 description 5
- 238000005507 spraying Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 206010033799 Paralysis Diseases 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
Classifications
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- 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
- F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
- F17C1/12—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge with provision for thermal insulation
-
- 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
- F17C13/00—Details of vessels or of the filling or discharging of vessels
-
- 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
- F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
- F17C7/02—Discharging liquefied gases
-
- 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
- F17C2270/00—Applications
- F17C2270/01—Applications for fluid transport or storage
- F17C2270/0102—Applications for fluid transport or storage on or in the water
- F17C2270/0105—Ships
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention relates to the technical field of LNG (liquefied natural gas), in particular to a natural gas storage tank for a ship. Comprises an inner container, an outer shell sleeved outside the inner container, a liquid outlet pipeline communicated with the inner container and penetrating out of the outer shell, and a leakage-proof component; the anti-leakage assembly comprises an anti-leakage sleeve, a filling pipe and a plugging device; the leakage-proof sleeve is sleeved on the liquid outlet pipeline; an interlayer annular cavity is formed between the leakage-proof sleeve and the liquid outlet pipeline; one end of the filling pipe is fixed on the leakage-proof sleeve and is communicated with the interlayer annular cavity; the filling pipe and the interlayer ring cavity form a closed cavity together; the plugging device is arranged on the filling pipe to perform one-way plugging on the closed cavity; the plugging device only allows outside air to enter the closed cavity in one direction through the plugging device; the closed chamber is filled with an inert gas and the pressure in the closed chamber is higher than the designed vapor pressure of the inner vessel. Under the action of pressure difference, the inert gas generates a gas seal effect on the liquid outlet pipeline, so that the liquid in the liquid outlet pipeline is inhibited from overflowing outwards, and the ejection quantity of the low-temperature liquid is greatly reduced.
Description
Technical Field
The invention relates to the technical field of LNG (liquefied natural gas), in particular to a natural gas storage tank for a ship.
Background
Referring to fig. 1, in the marine natural gas storage tank of the prior art, an opening is inevitably formed in an inner container 1 ' below the lowest liquid level, a liquid outlet connector 3 ' is fixed to the opening, and the inner container 1 ' is connected and communicated with one end of a stainless steel pipeline 4 ' through the liquid outlet connector 3 '. The stainless steel pipe 4 ' extends out of the housing 2 ' and is welded with the housing 2 ', and the other end of the stainless steel pipe 4 ' is welded with the stop valve 5 '. Wherein, the stainless steel pipeline 4' needs to be bent to meet the requirements of a process pipe orifice and design.
During the installation and manufacture of the stainless steel pipe 4 ', the following factors will cause the stainless steel pipe 4' to have an accidental leakage risk: 1. the performance of the liquid outlet joint 3 'and the stainless steel pipeline 4' and the performance of the stainless steel pipeline 4 'and the stop valve 5' are lower than the original performance of the stainless steel pipeline 4 ', and the stainless steel pipeline 4' has the risk of accidental breakage under the action of thermal stress. 2. The stainless steel pipeline 4 'needs to be subjected to cold bending under the condition of meeting the design condition, the austenitic stainless steel structure is changed, a small amount of martensite and ferrite appear, and the stainless steel pipeline 4' is easy to crack under the combined action of low temperature and fatigue load, so that natural gas leakage is caused. 3. At the welding position of the shell 2 'and the stainless steel pipeline 4', the wall of the stainless steel pipeline 4 'is thin, and if the welding parameters are improper, the welding is defective, and even the stainless steel pipeline 4' is broken.
Above reasons lead to stainless steel pipeline 4' to break in the use easily, in case form through crack, will lead to cryogenic liquid source to flow out constantly, until jar interior cryogenic liquid arranges completely, and gas supply system is in paralysed state completely simultaneously, and whole boats and ships are in the dangerous state that the natural gas constantly leaked, gasify and discharge, are unfavorable for the safe effective operation of boats and ships.
Disclosure of Invention
The invention aims to provide a natural gas storage tank for a ship, which aims to solve the problem that the safety of the ship is endangered due to the leakage of low-temperature liquid of a stainless steel pipeline of the natural gas storage tank for the ship in the prior art.
The purpose of the invention is realized by the following technical scheme:
the invention provides a marine natural gas storage tank, which comprises an inner container, an outer shell sleeved outside the inner container, a liquid outlet pipeline communicated with the inner container and penetrating out of the outer shell, and a leakage-proof assembly, wherein the inner container is provided with a plurality of through holes; the anti-leakage assembly comprises an anti-leakage sleeve, a filling pipe and a plugging device; the leakage-proof sleeve is sleeved on the liquid outlet pipeline; an interlayer annular cavity is formed between the leakage-proof sleeve and the liquid outlet pipeline; one end of the filling pipe is fixed on the leakage-proof sleeve and is communicated with the interlayer annular cavity; the filling pipe and the interlayer ring cavity form a closed cavity together; the plugging device is arranged on the filling pipe to perform one-way plugging on the closed cavity; the blocking device only allows outside air to enter the closed cavity in a one-way mode through the blocking device; the closed chamber is filled with an inert gas and the pressure in the closed chamber is higher than the design vapor pressure of the inner vessel.
Preferably, the leakage prevention assembly further comprises a first insulation material filled in the interlayer ring cavity.
Preferably, the filling tube has a first vertical tube section extending in a vertical direction; the lower end of the first vertical pipe section is connected with the leakage-proof sleeve; a second heat-insulating material is contained in the first vertical pipe section; the second thermal insulation material is granular.
Preferably, the second heat-insulating material is pearl sand.
Preferably, the filling pipe further has a bent pipe section and a second vertical pipe section extending in the vertical direction; two ends of the bent pipe section are respectively communicated with the upper end of the first vertical pipe section and the upper end of the second vertical pipe section; the second vertical pipe section and the first vertical pipe section are arranged in parallel; the plugging device is arranged on the second vertical pipe section.
Preferably, the first heat-insulating material is composed of glass fiber paper and/or pearl sand.
Preferably, the plugging device comprises a valve body and a valve core; the valve body is provided with a limit chamber, and an air inlet and an air outlet which are respectively communicated with the limit chamber; the valve body is arranged on the filling pipe, the air inlet is communicated with the outside, and the air outlet is communicated with the closed cavity; the valve core is movably positioned in the limiting cavity and can move between the air inlet and the air outlet under the action of pressure difference;
when the pressure at the air inlet is higher than the pressure at the air outlet, the valve core is far away from the air inlet, an inflation gap is formed between the valve core and the cavity wall of the limiting cavity, and external air can enter the closed cavity through the inflation gap and the air outlet; when the pressure at the air outlet is higher than the pressure at the air inlet, the valve core moves towards the direction of the air inlet and blocks the air inlet.
Preferably, the leak prevention assembly further comprises a sensor for detecting air pressure within the sandwiched annulus; the sensor is arranged on the leakage-proof sleeve.
Preferably, the marine natural gas storage tank further comprises a liquid outlet joint arranged on the bottom of the inner container and a valve arranged on the liquid outlet pipeline; the valve is located outside the housing;
the liquid outlet pipeline is communicated with the inner container through the liquid outlet joint; and two ends of the leakage-proof sleeve are respectively and fixedly connected with the liquid outlet joint and the valve.
Preferably, the leakage-proof sleeve is fixedly connected with the shell.
According to the technical scheme, the invention has the advantages and positive effects that: an interlayer annular cavity is arranged between the leakage-proof sleeve and the liquid outlet pipeline; a filling pipe is fixed on and communicated with the leakage-proof sleeve, and a plugging device is arranged on the filling pipe; the plugging device is used for performing one-way plugging on the filling pipe so as to limit the gas in the closed chamber to flow out, and an external inert gas supply unit can fill the closed chamber with inert gas in one way through the plugging device; the pressure of the gas in the closed chamber is higher than the design vapor pressure in the inner vessel; the liquid outlet pipeline is not welded with the shell; when the liquid outlet pipeline is accidentally damaged to form a through crack, the inert gas enters the liquid outlet pipeline, so that the ejection quantity of the low-temperature liquid is greatly reduced; moreover, under the action of the plugging device, low-temperature gas gasified by the low-temperature liquid sprayed into the interlayer ring cavity cannot be separated from the closed cavity, so that the air pressure of the closed cavity is increased, and the spraying amount of the low-temperature liquid is further reduced; therefore, the natural gas storage tank can be continuously used until the liquefied natural gas is used, and safe and effective operation of the ship is guaranteed.
Drawings
For the purpose of easy explanation, the present invention will be described in detail with reference to the following preferred embodiments and the accompanying drawings.
FIG. 1 is a schematic diagram of a marine natural gas storage tank according to the prior art;
FIG. 2 is a schematic structural diagram of a preferred embodiment of the marine natural gas storage tank of the present invention;
fig. 3 is a schematic view of a structure of a filling pipe of the marine natural gas storage tank shown in fig. 2 in a direction a;
fig. 4 is an enlarged schematic view of the filler pipe of the marine natural gas tank shown in fig. 3 at B.
Description of reference numerals: 1', an inner container; 2', a housing; 3', a liquid outlet joint; 4', stainless steel pipelines; 5', a stop valve; 1. an inner container; 2. a housing; 3. a liquid outlet joint; 4. a liquid outlet pipeline; 5. a valve; 6. a leak-proof assembly; 61. a leak-proof sleeve; 62. filling a pipe; 621. a first vertical pipe section; 622. a second vertical tube section; 63. a plugging device; 631. a valve body; 6311. a limiting chamber; 6312. an air inlet; 6313. an air outlet; 632. a valve core; 6321. a first block; 6322. a second block; 6323. a first seal ring; 6324. a second seal ring; 65. a first insulating material; 66. a second thermal insulation material; 67. an interlayer ring cavity; 68. closing the chamber; 7. the gas tank is connected with the place.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 2, in the present embodiment, the marine natural gas storage tank includes an inner container 1, an outer shell 2, a liquid outlet joint 3, a liquid outlet pipe 4, a valve 5, a leakage prevention assembly 6, and a gas tank connection 7.
Wherein the inner vessel 1 is used for containing cryogenic liquid. The outer shell 2 is sleeved outside the inner container 1, and a heat insulation material is filled between the outer shell 2 and the inner container 1 to form a vacuum environment. The liquid outlet joint 3 is arranged on the bottom of the inner container 1. The liquid outlet pipe 4 is communicated with the inner container 1 through the liquid outlet joint 3 and penetrates out of the outer shell 2. The valve 5 is arranged on the liquid outlet pipe 4 and is positioned outside the shell 2. The leakage-proof assembly 6 is arranged on the liquid outlet pipeline 4. The gas tank connecting place 7 is used for wrapping the liquid outlet pipeline 4, the valve 5 and the leakage-proof assembly 6 and preventing the low-temperature liquid from leaking to the deck of the ship body.
The inner container 1 comprises a first cylinder and two first end sockets sealed at two ends of the first cylinder. The shell 2 comprises a second cylinder and two second seal heads plugged at two ends of the second cylinder. The second cylinder is positioned at the outer side of the first cylinder; the two first seal heads are both positioned between the two second seal heads. An interlayer space is formed between the inner container 1 and the outer shell 2. The liquid outlet joint 3 is arranged at the bottom of the first barrel. The liquid outlet pipeline penetrates through the interlayer space and penetrates through the second seal head. The valve 5 is a stop valve.
The leakage prevention assembly 6 comprises a leakage prevention sleeve 61, a filling tube 62, a blocking device 63, a sensor (not shown), a first insulating material 65 and a second insulating material 66.
The inner pipe diameter of the leakage-proof sleeve 61 is larger than the outer pipe diameter of the liquid outlet pipe 4, the leakage-proof sleeve 61 is sleeved on the liquid outlet pipe 4, the leakage-proof sleeve 61 penetrates through the shell, the inner end of the leakage-proof sleeve 61 is fixedly connected with the liquid outlet joint 3, the outer end of the leakage-proof sleeve is fixedly connected with the valve 5, and the two ends of the leakage-proof sleeve 61 are respectively plugged by the liquid outlet joint 3 and the valve 5, so that an interlayer annular cavity 67 is formed between the leakage-proof sleeve 61 and the liquid outlet pipe 4. The pipe wall of the leakage-proof sleeve 61 is welded with the shell 2 to form a pipeline supporting point, so that shaking is prevented. The leakage-proof sleeve can be made of stainless steel.
The first insulating material 65 is filled in the interlayer ring cavity 67. The first insulating material 65 is composed of glass fiber paper and/or pearl sand. Specifically, the first heat-insulating material 65 may be made of glass fiber paper alone, and the glass fiber paper is coated on the liquid outlet pipe 4. Alternatively, the first heat-insulating material 65 is made of pearlife alone, and the pearlife is filled in the interlayer ring cavity 67. Of course, the liquid outlet pipe 4 may be coated with glass fiber paper, and the interlayer ring cavity 67 is filled with the pearl sand, that is, the glass fiber paper and the pearl sand are used in combination.
Referring to fig. 3, one end of the filling tube 62 is fixed on the leakage-proof sleeve 61 and is communicated with the interlayer ring cavity 67. The filling tube 62 and the sandwich ring cavity 67 together form a closed chamber 68. The closed chamber 68 is filled with an inert gas and the pressure in the closed chamber 68 is higher than the design vapour pressure of the inner vessel 1.
The inert gas may be nitrogen, argon, or the like. The heat preservation of the liquid outlet pipeline 4 can be realized by utilizing the characteristics of low heat conductivity and low boiling point of the inert gas.
Referring to fig. 3 and 4, the filling pipe 62 is U-shaped, and includes a first vertical pipe segment 621 and a second vertical pipe segment 622 that are arranged in parallel and spaced apart, and a bent pipe segment that connects the first vertical pipe segment 621 and the second vertical pipe segment 622. Both the first vertical tube segment 621 and the second vertical tube segment 622 extend vertically. Two ends of the bent pipe section are respectively communicated with the upper end of the first vertical pipe section and the upper end of the second vertical pipe section. The lower end of the first vertical pipe section 621 is connected to the leakage preventing sleeve 61. The lower end of the second vertical pipe section is used as a filling port for connecting an external inert gas supply unit.
It should be mentioned that the first vertical pipe section 621 contains the second thermal insulation material 66, and the second thermal insulation material 66 can move in the first vertical pipe section 621; the second insulating material 66 is in the form of pellets. Specifically, the second insulating material 66 is pearl sand. When the first heat-insulating material 65 in the interlayer ring cavity 67 is settled due to the vibration of the ship, the pearlife in the first vertical pipe section 621 can immediately enter the interlayer ring cavity 67 for supplement, and the heat-insulating effect of the interlayer ring cavity 67 is effectively ensured.
Second vertical tube segment 622 includes a first secondary tube segment and a second secondary tube segment located below the first secondary tube segment. The first secondary tube section communicates with the first vertical tube section 621. The first secondary pipe section is connected with the second secondary pipe section by a plugging device 63. The caliber of the lower port of the first secondary pipe section is gradually reduced from bottom to top.
The plugging device 63 is arranged on the filling pipe 62 to perform one-way plugging on the closed cavity 68 so as to maintain the air pressure of the interlayer ring cavity 67. In other words, the blocking device 63 only allows one-way entry of ambient gas into the closed chamber 68 via the blocking device 63.
The blocking device 63 includes a valve body 631 and a valve spool 632.
The valve body 631 is provided with a limiting chamber 6311, an air inlet 6312 communicated with the limiting chamber 6311, and an air outlet 6313 communicated with the limiting chamber 6311. Valve body 631 is mounted on second vertical tube section 622. The air inlet 6312 communicates with the outside through the second secondary pipe section. The air outlet 6313 communicates with the enclosed chamber 68 through the first secondary and vertical pipe sections 621. The valve body 631 is fixedly connected to the lower end of the first secondary pipe section, and the diameter of the air outlet 6313 is the same as the diameter of the rim of the lower port of the first secondary pipe section.
The spool 632 is movably disposed in the limiting chamber 6311 and is capable of moving between the inlet port 6312 and the outlet port 6313 under the action of a pressure differential. The spool 632 is limited to the first secondary section, so that the spool 632 can naturally fall on the inlet under the action of gravity when the air pressures of the inlet and the outlet are equal. Of course, the diameter of the lower port of the first secondary pipe section may be designed to be larger than the diameter of the air outlet port 6313.
The spool 632 includes a first block 6321, a second block 6322, a first seal 6323, and a second seal 6324. The second block 6322 protrudes on the middle portion of the first block 6321.
The shape and size of the first block 6321 are matched with the space of the limiting chamber 6311, that is, a first gap exists between the first block 6321 and the lateral chamber wall of the limiting chamber 6311. An annular first mounting groove is formed in the edge of the bottom surface of the first block 6321; a first sealing ring 6323 is fixed in the first mounting groove; the first sealing ring 6323 can be attached to the bottom wall of the limiting chamber 6311.
A second block 6322 is movably received in inlet 6312. A second mounting groove is formed in the side surface of the second block 6322; a second sealing ring 6324 is fixed in the second mounting groove.
When the pressure at the air outlet 6313 is higher than the pressure at the air inlet 6312, the valve core 632 moves toward the air inlet 6312, the first sealing ring 6323 fits against the bottom wall of the limiting chamber 6311, the second block 6322 is inserted into the air inlet 6312, and the second sealing ring 6324 fits against the sidewall of the air inlet 6312 to seal the air inlet 6312. The valve core 632 can be more stably sealed at the air inlet 6312 by using the gravity of the valve core 632.
When the pressure at the air inlet 6312 is higher than the pressure at the air outlet 6313, the second block 6322 is far away from the air inlet 6312, a second gap is formed between the valve core 632 and the bottom surface cavity wall of the limit chamber 6311, and the second gap and the first gap form an inflation gap. Ambient gas can enter the enclosed chamber 68 through the inflation gap and the gas outlet 6313.
The sensor is arranged on the leakage-proof sleeve 61 and used for detecting the air pressure in the interlayer annular cavity 67, when the liquid outlet pipeline 4 is accidentally damaged and forms a through crack, the inert gas in the closed cavity 68 enters the liquid outlet pipeline 4, and the sensor can detect the reduction of the pressure value in the closed cavity 68 and give an alarm to remind a worker.
Referring to fig. 2 and fig. 3, the working principle of the present embodiment is as follows: an external inert gas supply unit fills the filling pipe 62 with inert gas, which passes through the blocking device 63 into the closed chamber 68. When the pressure in the closed chamber 68 reaches a predetermined pressure value (which is higher than the designed vapor pressure of the inner vessel 1), the filling with inert gas is stopped, at which point the pressure in the closed chamber 68 is higher than the atmospheric pressure of the environment, and the blocking device 63 restricts the outflow of the inert gas in the closed chamber 68 to the environment.
When the liquid outlet pipe 4 is accidentally damaged to form a through crack, the gas pressure in the closed chamber 68 is greater than the designed vapor pressure of the inner container 1, and the inert gas has a gas sealing effect on the liquid outlet pipe 4 under the action of the pressure difference, so that the liquid in the liquid outlet pipe 4 is prevented from overflowing outwards, and the spraying amount of the low-temperature liquid is greatly reduced. Meanwhile, under the action of the plugging device 63, low-temperature gas gasified by low-temperature liquid sprayed into the interlayer ring cavity 67 cannot be separated from the closed cavity 68 and cannot overflow to the outside, and the use safety is improved. The low-temperature gas vaporized from the low-temperature liquid increases the gas pressure in the closed chamber 68, and further reduces the amount of low-temperature liquid discharged. Therefore, the natural gas storage tank can be continuously used until the liquefied natural gas is used, and safe and effective operation of the ship is guaranteed. The leakage of the liquid outlet pipeline 4 is compensated for, and the use and the maintenance are required to be stopped immediately. In addition, under the action of the pressure difference, inert gas can enter the liquid outlet pipeline 4, the pressure value in the closed cavity 68 can be reduced, and the sensor can give an alarm when detecting the pressure reduction, so that an operator is reminded, and the safety is further improved.
The invention has at least the following advantages:
1. an interlayer annular cavity 67 is arranged between the leakage-proof sleeve 61 and the liquid outlet pipeline 4; a filling pipe 62 is fixed on and communicated with the leakage-proof sleeve 61, and a plugging device 63 is arranged on the filling pipe 62; the blocking device 63 is used for performing one-way blocking on the filling pipe 62 so as to limit the outflow of the gas in the closed chamber 68, and an external inert gas supply unit can fill the closed chamber 68 with the inert gas in one way through the blocking device 63; the gas pressure in the closed chamber 68 is higher than the design vapour pressure in the inner vessel 1; the liquid outlet pipeline 4 is not welded with the shell 2; when the liquid outlet pipeline 4 is accidentally damaged to form a through crack, the high-pressure inert gas enters the liquid outlet pipeline 4, so that the ejection quantity of the low-temperature liquid is greatly reduced; moreover, under the action of the plugging device 63, the low-temperature gas gasified by the low-temperature liquid sprayed into the interlayer ring cavity 67 cannot be separated from the closed chamber 68, so that the air pressure of the closed chamber 68 is increased, and the spraying amount of the low-temperature liquid is further reduced; therefore, the natural gas storage tank can be continuously used until the liquefied natural gas is used, and safe and effective operation of the ship is guaranteed.
2. When the first heat-insulating material 65 in the interlayer ring cavity 67 is settled due to the vibration of the ship, the pearlife in the first vertical pipe section 621 can immediately enter the interlayer ring cavity 67 for supplement, and the heat-insulating effect of the interlayer ring cavity 67 is effectively ensured.
3. When the liquid outlet pipeline 4 is accidentally damaged to form a through crack, the inert gas in the closed cavity 68 enters the liquid outlet pipeline 4, and the sensor can detect that the pressure value in the closed cavity 68 is reduced, so that an alarm is given to remind workers and improve the safety of the marine natural gas storage tank.
In the description of the present specification, reference to the description of the terms "one embodiment", "some embodiments", "an illustrative embodiment", "an example", "a specific example", or "some examples", etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A marine natural gas storage tank comprises an inner container, an outer shell sleeved outside the inner container, and a liquid outlet pipeline communicated with the inner container and penetrating out of the outer shell, and is characterized by further comprising a leakage-proof assembly; the leak-proof assembly includes:
the leakage-proof sleeve is sleeved on the liquid outlet pipeline; an interlayer annular cavity is formed between the leakage-proof sleeve and the liquid outlet pipeline;
one end of the filling pipe is fixed on the leakage-proof sleeve and is communicated with the interlayer annular cavity; the filling pipe and the interlayer ring cavity form a closed cavity together;
the plugging device is arranged on the filling pipe and used for performing one-way plugging on the closed cavity; the blocking device only allows outside air to enter the closed cavity in a one-way mode through the blocking device;
the closed chamber is filled with an inert gas and the pressure in the closed chamber is higher than the design vapor pressure of the inner vessel.
2. The marine natural gas storage tank of claim 1, wherein the leak-proof assembly further comprises a first insulating material filled in the sandwich ring cavity.
3. Marine natural gas storage tank according to claim 2, characterised in that the filling pipe has a first vertical pipe section extending in vertical direction; the lower end of the first vertical pipe section is connected with the leakage-proof sleeve;
a second heat-insulating material is contained in the first vertical pipe section; the second thermal insulation material is granular.
4. The marine natural gas storage tank of claim 3, wherein the second thermal insulation material is a bead blasted sand.
5. The marine natural gas storage tank of claim 3, wherein the filler pipe further has a bent pipe section and a second vertical pipe section extending in a vertical direction; two ends of the bent pipe section are respectively communicated with the upper end of the first vertical pipe section and the upper end of the second vertical pipe section; the second vertical pipe section and the first vertical pipe section are arranged in parallel; the plugging device is arranged on the second vertical pipe section.
6. The marine natural gas storage tank of claim 2, wherein said first insulating material is comprised of fiberglass paper and/or pearlife.
7. Marine natural gas storage tank according to claim 1, characterised in that the plugging device comprises:
the valve body is provided with a limiting cavity, and an air inlet and an air outlet which are respectively communicated with the limiting cavity; the valve body is arranged on the filling pipe, the air inlet is communicated with the outside, and the air outlet is communicated with the closed cavity;
the valve core is movably positioned in the limiting cavity and can move between the air inlet and the air outlet under the action of pressure difference;
when the pressure at the air inlet is higher than the pressure at the air outlet, the valve core is far away from the air inlet, an inflation gap is formed between the valve core and the cavity wall of the limiting cavity, and external air can enter the closed cavity through the inflation gap and the air outlet; when the pressure at the air outlet is higher than the pressure at the air inlet, the valve core moves towards the direction of the air inlet and blocks the air inlet.
8. The marine natural gas storage tank of claim 1, wherein the leak-prevention assembly further comprises a sensor for detecting air pressure within the mezzanine ring cavity; the sensor is arranged on the leakage-proof sleeve.
9. The marine natural gas storage tank of claim 1, further comprising a tapping fitting on a bottom of the inner vessel, and a valve on the tapping line; the valve is located outside the housing;
the liquid outlet pipeline is communicated with the inner container through the liquid outlet joint; and two ends of the leakage-proof sleeve are respectively and fixedly connected with the liquid outlet joint and the valve.
10. The marine natural gas storage tank of claim 1, wherein said leak-proof sleeve is fixedly attached to said outer shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811437181.9A CN111237629B (en) | 2018-11-28 | 2018-11-28 | Marine natural gas storage tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811437181.9A CN111237629B (en) | 2018-11-28 | 2018-11-28 | Marine natural gas storage tank |
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| CN111237629A true CN111237629A (en) | 2020-06-05 |
| CN111237629B CN111237629B (en) | 2022-04-15 |
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| CN201811437181.9A Active CN111237629B (en) | 2018-11-28 | 2018-11-28 | Marine natural gas storage tank |
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| CN111237629B (en) | 2022-04-15 |
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