CN113324167A - Ship LNG engine gas supply system - Google Patents

Ship LNG engine gas supply system Download PDF

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Publication number
CN113324167A
CN113324167A CN202110545919.9A CN202110545919A CN113324167A CN 113324167 A CN113324167 A CN 113324167A CN 202110545919 A CN202110545919 A CN 202110545919A CN 113324167 A CN113324167 A CN 113324167A
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CN
China
Prior art keywords
storage tank
natural gas
supply system
air
containing cavity
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Granted
Application number
CN202110545919.9A
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Chinese (zh)
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CN113324167B (en
Inventor
曲世祥
周洋
陈志远
赵明珠
沈晶
于远洋
沈小伟
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Shanghai Hui Ge Environmental Technology Co ltd
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Shanghai Hui Ge Environmental Technology Co ltd
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Priority to CN202110545919.9A priority Critical patent/CN113324167B/en
Publication of CN113324167A publication Critical patent/CN113324167A/en
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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
    • F17C3/00—Vessels not under pressure
    • 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
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
    • F17C9/04—Recovery of thermal energy
    • 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
    • F17C2201/035—Orientation with substantially horizontal 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
    • 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
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0135—Pumps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The invention discloses a ship LNG engine gas supply system, which comprises a storage tank, a vaporizer and a compressor, wherein the storage tank internally comprises a first containing cavity and a second containing cavity, the first containing cavity is communicated with the second containing cavity through a pipeline fluid, a throttling device is further arranged on the pipeline, and liquid natural gas in the first containing cavity is changed into low-temperature and low-pressure liquid natural gas and then enters the second containing cavity through the throttling action of the throttling device, so that the low-temperature liquid natural gas in the second containing cavity can absorb the gas or liquid natural gas in the second containing cavity, the gas natural gas in the second containing cavity can be reliquefied, the liquid natural gas in the second containing cavity can be cooled to a supercooled state from a saturated state, the gas supply system can be ensured to run safely, the running cost is lower, and the structure is simple.

Description

Ship LNG engine gas supply system
Technical Field
The invention relates to the technical field of ship equipment, in particular to a ship LNG engine gas supply system.
Background
Natural gas is increasingly used as a fuel for ship engines as a clean energy source, but gaseous natural gas occupies a large space and is inconvenient to transport and store, so that generally, a pressurizing and cooling method is used to liquefy gaseous natural gas NG into liquid natural gas LNG in a storage tank, and after the low-temperature LNG in the storage tank absorbs external heat, part of the LNG is vaporized into a gaseous state and the pressure in the storage tank is increased. Both the refrigeration system and the vaporizer consume a significant amount of energy to operate.
Disclosure of Invention
The invention mainly solves the technical problems in the prior art, and provides the LNG engine gas supply system for the ship, which can cool the LNG in the LNG storage tank by using the cold energy generated by vaporization before the LNG enters the engine, and has the advantages of low operation cost and simple structure.
The invention solves the technical problems existing in the prior art through the following technical scheme:
a ship LNG engine air supply system comprises a storage tank, a vaporizer and a compressor, wherein the vaporizer comprises a first flow passage and a second flow passage, the first flow passage is used for circulating natural gas, one end of the first flow passage of the vaporizer is connected with the storage tank, the other end of the first flow passage of the vaporizer is connected with an air suction port of the compressor, the second flow passage of the vaporizer is used for circulating air or water, the natural gas in the first flow passage can absorb the heat of the air or the water in the second flow passage through the vaporizer, the storage tank comprises a first accommodating cavity and a second accommodating cavity, the ship LNG engine air supply system further comprises a booster pump and a first throttling device, the booster pump comprises an inlet and an outlet, the inlet of the booster pump is communicated with the bottom of the first accommodating cavity in a fluid mode, the outlet of the booster pump is in fluid communication with one end of the first throttling device, the other end of the first throttling device is in fluid communication with the second containing cavity, liquefied natural gas is stored in the first containing cavity, the booster pump can pump the liquefied natural gas in the first containing cavity into the second containing cavity, one end of a first flow passage of the vaporizer is in fluid communication with one end of the second throttling device, and the other end of the second throttling device is in fluid communication with the bottom of the second containing cavity.
As a more preferable technical scheme of the present invention, the compressor includes an air supplement port, the gas supply system for the ship LNG engine further includes an air supplement pipeline, one end of the air supplement pipeline is communicated with the upper portion of the second cavity, and the other end of the air supplement pipeline is communicated with the air supplement port.
As a more preferable technical solution of the present invention, the LNG engine air supply system for a ship further includes a superheater, the superheater includes a third flow passage and a fourth flow passage, the third flow passage is used for flowing natural gas, the fourth flow passage is used for flowing air or water, the natural gas in the third flow passage can absorb heat of the air or water in the fourth flow passage through the vaporizer, and the third flow passage forms a part of the air make-up line, so that the gas in the second chamber can absorb heat of the air or water in the fourth flow passage through the superheater before entering the air make-up port, and the superheated state is achieved.
As a more preferable technical scheme of the invention, a partition plate is arranged in the storage tank, and the partition plate divides the inner space of the storage tank into a first containing cavity and a second containing cavity.
As a more preferable technical scheme of the invention, the partition plate structure is characterized in that the partitions are horizontally arranged, vertically arranged or obliquely arranged.
As a more preferable technical solution of the present invention, the partition is horizontally disposed near the top of the storage tank, the storage tank further includes an accessory connecting pipe vertically disposed, the accessory connecting pipe is installed at the top of the storage tank, one end of the accessory connecting pipe is disposed outside the storage tank, and the other end of the accessory connecting pipe passes through the second cavity and the partition and is in fluid communication with the top of the first cavity.
As a more preferable technical scheme of the invention, the partition plate is of a cylindrical structure, and the axis of the cylindrical structure is horizontally arranged or vertically arranged.
As a more preferable technical scheme of the invention, the storage tank is a horizontal storage tank, a vertical storage tank or a spherical tank.
The gas supply system of the ship LNG engine has the advantages that: the LNG in the LNG storage tank can be cooled by using the cold energy generated by vaporization before the LNG enters the engine, the operation cost is low, and the structure is simple.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a gas supply system of a marine LNG engine according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of an LNG engine gas supply system of a ship from another perspective according to a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of a gas supply system of an LNG engine of a ship according to a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of a gas supply system of an LNG engine of a ship according to a third embodiment of the present invention;
fig. 5 is a schematic structural diagram of a gas supply system of an LNG engine of a ship according to a fourth embodiment of the present invention;
fig. 6 is a schematic structural diagram of a gas supply system of a marine LNG engine according to a fifth embodiment of the present invention;
wherein:
1. a storage tank; 11. a first cavity; 12. a second cavity; 13. a partition plate; 14. an accessory connecting pipe;
2. a vaporizer;
3. a compressor;
4. a booster pump;
5. a first throttling device;
6. an air supply pipeline; 61. a superheater;
7. a gas-liquid separator;
8. and a second throttling device.
Detailed Description
The following detailed description of the preferred embodiments of the present invention is provided to enable those skilled in the art to more readily understand the advantages and features of the present invention and to clearly and unequivocally define the scope of the present invention.
The gas supply system of the ship LNG engine has the advantages that: the LNG in the LNG storage tank can be cooled by using the cold energy generated by vaporization before the LNG enters the engine, the operation cost is low, and the structure is simple.
The first embodiment is as follows:
as shown in fig. 1 and 2, the gas supply system for the marine LNG engine includes a storage tank 1, a vaporizer 2 and a compressor 3, wherein the storage tank is a horizontal storage tank; the vaporizer 2 comprises a first flow channel and a second flow channel, the first flow channel is used for circulating natural gas, one end of the first flow channel of the vaporizer 2 is connected with the storage tank 1, the other end of the first flow channel of the vaporizer 2 is connected with an air suction port of the compressor 3, the second flow channel of the vaporizer 2 is used for circulating air or water, liquid natural gas stored in the storage tank 1 can flow to the compressor through the first flow channel, the liquid natural gas can absorb heat of air or water in the second flow channel through the vaporizer 2 and become gaseous when flowing through the first flow channel, and an exhaust port of the compressor 3 is connected with the engine, so that the compressor 3 can compress gaseous natural gas with lower pressure entering the air suction port into natural gas with higher pressure and discharge the natural gas into a cylinder of the engine. A partition 13 is horizontally arranged at the upper part in the storage tank 1, the partition 13 divides the internal space of the storage tank 1 into a lower first containing cavity 11 and an upper second containing cavity 12, liquefied natural gas is stored in the first containing cavity 11, a booster pump 4 is arranged at the bottom of the first containing cavity 11, an inlet of the booster pump 4 is in fluid communication with the bottom of the first containing cavity 11, an outlet of the booster pump 4 is in fluid communication with the second containing cavity 12 through a pipeline 15, so that the booster pump 4 can pump the liquefied natural gas in the first containing cavity 11 into the second containing cavity 12, a first throttling device 5 is arranged on the pipeline 15, after the high-pressure liquefied natural gas is throttled by the first throttling device 5, part of the liquefied natural gas is gasified into a gaseous state and absorbs heat, and the other part of the liquefied natural gas releases heat, thereby reducing the temperature to a lower temperature, the gaseous natural gas in the second cavity 12 stays at the upper part of the second cavity 12, and the liquid natural gas in the second cavity 12 stays at the bottom of the second cavity 12, that is, the low-temperature liquid natural gas in the second cavity 12 stays above the partition 13 and contacts with the partition 13; after the liquefied natural gas in the first cavity 11 absorbs heat, part of the liquefied natural gas is gasified into a gaseous state and rises to the top of the first cavity 11, that is, the gaseous natural gas in the first cavity 11 stays below the partition plate 13 and contacts with the partition plate; therefore, the low-temperature liquefied natural gas at the bottom of the second cavity 12 can absorb heat in the gaseous natural gas at the top of the first cavity 11 through the partition plate 13, so that the gaseous natural gas in the first cavity 11 is condensed into liquefied natural gas again, and therefore, a refrigeration system does not need to be additionally arranged in the first cavity 11 to condense the gasified natural gas in the first cavity 11, so that the operation cost is low, and the natural gas in the second cavity 12 can also primarily absorb certain heat.
One end of the first flow channel of the vaporizer 2 is in fluid communication with the bottom of the second cavity 12, when the compressor 3 operates, the liquefied natural gas at the bottom of the second cavity 12 can be naturally pumped out and flows through the first flow channel of the vaporizer 2, when the liquefied natural gas flows through the first flow channel, the liquefied natural gas can be gasified into a gaseous state and reach an overheat state by absorbing the heat of air or water in the second flow channel through the vaporizer 2, and the overheat state can avoid droplets in the gaseous natural gas. It is worth mentioning that the types of the vaporizers 2 are various, and some vaporizers do not have an obvious second flow channel for air or water to flow through, but are directly immersed in air or water to absorb heat from the air or water, such as air temperature type vaporizers and water bath type vaporizers, and such vaporizers do not have an obvious channel for air or water to flow through, but the space near the surface of the vaporizers of this type for air or water to flow can be regarded as the second flow channel referred to in this patent.
The compressor 3 comprises an air supplement port, the air supply system for the ship LNG engine further comprises an air supplement pipeline 6, one end of the air supplement pipeline 6 is communicated with the upper portion of the second containing cavity 12, the other end of the air supplement pipeline 6 is communicated with the air supplement port, a superheater 61 is installed on the air supplement pipeline 6, the superheater 61 comprises a third flow channel and a fourth flow channel, the third flow channel is used for flowing natural gas, the fourth flow channel is used for flowing air or water, the natural gas in the third flow channel can absorb heat of the air or water in the fourth flow channel through the vaporizer 2, and the third flow channel forms a part of the air supplement pipeline 6, so that the gas in the second containing cavity 12 can reach a superheated state by absorbing the heat of the air or water in the fourth flow channel through the superheater before entering the air supplement port. Compressor 3 with middle tonifying qi mouth can improve the flow of compressor, improve the efficiency of compressor, this patent is taken away the gaseous natural gas that this second holds the intracavity 12 through the tonifying qi mouth of this compressor, the gaseous state refrigerant that this second holds intracavity 12 is the saturation state, therefore contain the droplet easily, the droplet can damage the compressor through the liquid attack effect after getting into compressor 3, it can effectively avoid the condition discovery of liquid attack to set up this over superheater 61 on this tonifying qi pipeline 6, in addition, can also set up filter equipment at the entry position of this tonifying qi pipeline 6, filter equipment can avoid the liquid attack condition to take place through the form of filtering the droplet.
The tank 1 is a pressure vessel and therefore has some accessories that must be mounted on top of the pressure vessel, such as: a safety valve must be installed at the top of the tank 1 in order to quickly release the gas therein when the pressure in the tank 1 is too high, but in this embodiment, the top of the first volume 11 containing a large amount of lng is occupied by the second volume 12, and such accessories cannot be installed. To solve this problem, an accessory connecting pipe 14 may be vertically installed at the top of the storage tank 1, one end of the accessory connecting pipe 14 is disposed outside the storage tank 1, and the other end of the accessory connecting pipe 14 passes through the second receiving chamber 12 and the partition 13 to fluidly communicate with the top of the first receiving chamber 11. By means of this attachment connection pipe 14, it is possible to mount the attachment, which must be mounted on the top of the pressure vessel, on the top of the first chamber 11, which is mainly used for storing the liquid refrigerant, so that the storage tank 1 can still operate normally. The number of the accessory connecting pipes 14 can be determined according to the number of specific accessories, for example, two safety valves are required to be installed on a certain storage tank 1 to ensure the safe operation of the storage tank, two accessory connecting pipes 14 can be installed on the storage tank, and one safety valve is installed on each accessory connecting pipe 14; if more accessories are needed to be installed on the top of the pressure vessel, more accessory connecting pipes 14 can be arranged, and the detailed description is omitted.
Example two:
the marine LNG engine gas supply system in the second embodiment is substantially the same as the marine LNG engine gas supply system in the first embodiment, except that, as shown in fig. 3, the partition plate 13 in the storage tank 1 in the second embodiment is horizontally arranged near the bottom of the storage tank 1, the structure is such that the first cavity 11 for containing more LNG is located at the upper part of the storage tank 1, the LNG in the first cavity 11 is located above the partition plate 13, and the second cavity 12 for containing the gaseous and LNG at a lower temperature is located at the bottom of the storage tank 1, so that the gaseous and LNG in the second cavity 12 can rapidly absorb the heat of the LNG in the first cavity 11 through the partition plate 13 to rapidly reach an overcooled state, and the LNG in the overcooled state is not easily vaporized into the gaseous natural gas; in the second embodiment, the highest point of the interior of the storage tank 1 is also the highest point of the interior of the first receiving chamber 11, so that an accessory such as a safety valve, which must be mounted at the highest point of the pressure vessel, can be directly mounted on the storage tank 1 without providing the accessory connecting pipe 14 in the first embodiment.
Example three:
the marine LNG engine gas supply system in the third embodiment is substantially the same as the marine LNG engine gas supply system in the first embodiment, except that, as shown in fig. 4, the partition plate 13 in the storage tank 1 in the third embodiment is vertically disposed at the right side of the inside of the storage tank 1, and it is obvious that, in other embodiments, the partition plate 13 may also be vertically disposed at the left side or the center of the inside of the storage tank 1. This configuration allows a first volume 11 containing more lng to be located on the left side of the tank 1 and a second volume 12 containing lower temperature gaseous and lng to be located on the right side of the tank 1; the natural gas in each of the first and second cavities 11 and 12 is divided into the gaseous natural gas at the upper portion and the liquefied natural gas at the lower portion under the action of gravity, and this structure enables the gaseous natural gas at the upper portion in the first cavity 11 to transfer heat to the gaseous natural gas at the lower portion in the second cavity 12 through the partition 13, and the gaseous natural gas at the lower portion in the first cavity 11 to transfer heat to the liquefied natural gas at the lower portion in the second cavity 12 through the partition 13. In the first embodiment and the second embodiment, the media on the upper and lower sides of the partition plate are respectively the liquefied natural gas and the gaseous natural gas, and the heat transfer coefficient between the liquefied natural gas and the partition plate is significantly higher than that between the gaseous natural gas and the partition plate, so that the heat transfer efficiency between the liquefied natural gas and the gaseous natural gas on the two sides of the partition plate is limited by the transfer effect between the gaseous natural gas and the partition plate, and the overall heat transfer efficiency is also affected; in the third embodiment, although the liquid level heights of the first cavity 11 and the second cavity 12 are not the same, the heat transfer between the gaseous natural gas at the upper part in the first cavity 11 and the gaseous natural gas at the upper part in the second cavity 12, and the heat transfer between the liquid at the lower part in the first cavity 11 and the liquid natural gas at the lower part in the second cavity 12 can be still caused, so that the structure in the third embodiment has better heat transfer efficiency, not only can the gaseous natural gas in the first cavity 11 be rapidly condensed into the liquid natural gas, but also can the liquid natural gas in the first cavity 11 be rapidly brought into a supercooled state, in addition, the internal height of the second cavity 12 in the structure in the third embodiment is larger than the internal height of the second cavity 12 in the first embodiment and the second embodiment, so that the gas-liquid separation effect is better, and the gas carrying amount in the gas supplementing pipeline 6 in the third embodiment is naturally smaller, the capacity of the superheater 61 can thus be designed to be smaller; in addition, the structure in the third embodiment also enables the highest point of the inner part of the storage tank 1 to be the highest point of the first containing cavity 11, so that the accessory such as a safety valve which is required to be arranged at the highest point of the pressure container can be directly arranged on the storage tank 1 without arranging the accessory connecting pipe 14 in the first embodiment; these all contribute to cost reduction.
Example four:
the marine LNG engine gas supply system in the fourth embodiment is substantially the same as the marine LNG engine gas supply system in the fourth embodiment, except that, as shown in fig. 5, the partition plate 13 in the storage tank 1 in the fourth embodiment is obliquely arranged on the upper right side of the inside of the storage tank 1, and the partition plate 13 in the third embodiment is vertically arranged on the right side of the inside of the storage tank 1; in the third embodiment, when the liquid refrigerant in the first cavity 11 is close to the full state, the low-temperature natural gas in the second cavity 12 cannot absorb the liquid refrigerant in the first cavity 11 through the partition plate 13, and the partition plate 13 is obliquely arranged on the upper right side of the inside of the storage tank 1, so that the technical problem can be better solved, but the height of the second cavity 12 in the fourth embodiment is lower than that of the second cavity 12 in the third embodiment, and therefore, the gas-liquid separation effect is also lower than that of the second cavity 12 in the third embodiment.
Example five:
the connection size of the partition 13 and the inner wall of the storage tank 1 in the first to fourth embodiments is long, so that a large amount of welding work is required in actual production, the production cost is high, the welding work is performed inside the storage tank 1, and the working environment of workers is also severe. To solve this problem, the present invention provides a fifth embodiment, which is substantially similar in structure to the third embodiment, as shown in fig. 6, except that in the fifth embodiment, the partition plate 13 is a cylindrical structure, and the axis of the cylindrical structure is arranged vertically. The cylindrical structure can be manufactured outside the storage tank 1, and then the storage tank 1 is welded and fixed, in the fifth embodiment, the cylindrical space inside the cylindrical structure is the second cavity 12, and it is obvious that the height of the second cavity 12 is equal to the diameter of the storage tank 1, that is, greater than the height of the second cavity 12 in the third embodiment, so the gas-liquid separation effect is better. Moreover, the technical effect similar to that of the third embodiment can be achieved, that is, the gaseous natural gas in the first cavity 11 and the gaseous natural gas in the second cavity 12 transfer heat through the partition plate 13, and the liquid natural gas in the first cavity 11 and the liquid natural gas in the second cavity 12 transfer heat, so that the heat transfer efficiency is high.
In the fifth embodiment, the cylindrical structure enclosed by the partition plates is vertically arranged, while in other embodiments, the cylindrical structure enclosed by the partition plates 13 can also be horizontally arranged, in which case, the two ends of the cylindrical structure need to be sealed by end covers. If the cylindrical structure is arranged close to the upper part of the inside of the storage tank 1, the liquefied natural gas in the second cavity 12 formed by the cylindrical structure can absorb the heat of the gaseous natural gas in the first cavity 11 through the partition plate, so that the gaseous natural gas in the first cavity 11 can be changed into a liquid state again, and the reliquefaction effect is achieved; if the cylindrical structure is arranged near the lower part of the inside of the storage tank 1, the liquefied natural gas in the second cavity 12 formed by the cylindrical structure can absorb the heat of the liquefied natural gas in the first cavity 11 through the partition plate, so that the gaseous natural gas in the first cavity 11 can be changed into a liquid state again, and the reliquefaction effect is achieved.
The storage tanks 1 in the first to sixth embodiments are all horizontal storage tanks, and the technical solution in the above embodiments is obviously also applicable to common vertical storage tanks or spherical tanks, and a person skilled in the art can easily apply the technical solution applicable to horizontal storage tanks to common storage containers, vertical storage tanks and spherical tanks for liquefied natural gas, without creative work.
The above is only the design idea of some embodiments of the present invention, and the present invention can be expanded to connect more function modules externally at the same time when the system allows, thereby expanding the functions of the present invention to the maximum.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.

Claims (8)

1. An LNG engine air supply system for a ship, comprising a storage tank (1), a vaporizer (2) and a compressor (3), wherein the vaporizer (2) comprises a first flow passage and a second flow passage, the first flow passage is used for circulating natural gas, one end of the first flow passage of the vaporizer (2) is connected with the storage tank (1), the other end of the first flow passage of the vaporizer (2) is connected with an air suction port of the compressor (3), the second flow passage of the vaporizer (2) is used for circulating air or water, the natural gas in the first flow passage can absorb heat of the air or water in the second flow passage through the vaporizer (2), and the LNG engine air supply system is characterized in that: the storage tank (1) comprises a first containing cavity (11) and a second containing cavity (12), the LNG engine gas supply system for the ship further comprises a booster pump (4) and a first throttling device (5), the booster pump (4) comprises an inlet and an outlet, the inlet of the booster pump (4) is in fluid communication with the bottom of the first containing cavity (11), the outlet of the booster pump (4) is in fluid communication with one end of the first throttling device (5), the other end of the first throttling device (5) is in fluid communication with the second containing cavity (12), liquefied natural gas is stored in the first containing cavity (11), the booster pump (4) can pump the liquefied natural gas in the first containing cavity (11) into the second containing cavity (12), one end of a first flow passage of the vaporizer (2) is in fluid communication with one end of the second throttling device (8), the other end of the second throttling device (8) is communicated with the bottom of the second cavity (12) in a fluid mode.
2. The marine LNG engine gas supply system according to claim 1, characterized in that: compressor (3) include an air supplement mouth, boats and ships LNG engine gas supply system still include an air supplement pipeline (6), the one end of air supplement pipeline (6) with the second upper portion that holds chamber (12) be linked together, the other end of air supplement pipeline (6) with the air supplement mouth be linked together.
3. The marine LNG engine gas supply system according to claim 2, characterized in that: the LNG engine air supply system for the ship further comprises a superheater (61), the superheater (61) comprises a third flow channel and a fourth flow channel, the third flow channel is used for circulating natural gas, the fourth flow channel is used for circulating air or water, the natural gas in the third flow channel can pass through the vaporizer (2) to absorb the heat of the air or water in the fourth flow channel, the third flow channel forms a part of the air supplementing pipeline (6) to enable the gas in the second accommodating cavity (12) to pass through the superheater (61) to absorb the heat of the air or water in the fourth flow channel before entering the air supplementing port so as to achieve a superheated state.
4. The marine LNG engine gas supply system according to claim 2, characterized in that: a partition plate (13) is arranged in the storage tank (1), and the partition plate (13) divides the inner space of the storage tank (1) into a first containing cavity (11) and a second containing cavity (12).
5. Marine LNG engine gas supply system according to claim 4, characterized in that: the partition plate (13) is of a flat plate structure, and the partition plate (13) is horizontally arranged, vertically arranged or obliquely arranged.
6. Marine LNG engine gas supply system according to claim 4, characterized in that: the baffle (13) is close to the top of the storage tank (1) and is horizontally arranged, the storage tank (1) further comprises an accessory connecting pipe (14) which is vertically arranged, the accessory connecting pipe (14) is installed at the top of the storage tank (1), one end of the accessory connecting pipe (14) is arranged on the outer side of the storage tank (1), and the other end of the accessory connecting pipe penetrates through the second accommodating cavity (12) and the baffle (13) and is communicated with the top of the first accommodating cavity (11) in a fluid mode.
7. Marine LNG engine gas supply system according to claim 4, characterized in that: the partition plate (13) is of a cylindrical structure, and the axis of the cylindrical structure is horizontally arranged or vertically arranged.
8. The marine LNG engine gas supply system according to claim 1, characterized in that: the storage tank (1) is a horizontal storage tank, a vertical storage tank or a spherical tank.
CN202110545919.9A 2021-05-19 2021-05-19 Ship LNG engine gas supply system Active CN113324167B (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0715119A2 (en) * 1994-12-03 1996-06-05 MESSER GRIESHEIM GmbH Process for vaporizing liquefied gases at low temperatures
CN102588730A (en) * 2012-02-24 2012-07-18 南京亚格泰新能源材料有限公司 Cooling silane intermediate storage tank with outer coiled pipe
WO2014177761A1 (en) * 2013-04-29 2014-11-06 Wärtsilä Finland Oy Fuel tank arrangement for liquefied gas in a marine vessel
CN104295889A (en) * 2014-10-20 2015-01-21 中国海洋石油总公司 Vaporized gas recovery system of LNG (Liquid Natural Gas) receiving station terminal
CN104389697A (en) * 2014-10-29 2015-03-04 沪东重机有限公司 Supercharged-gasifying gas supply system and method
CN105627096A (en) * 2015-09-11 2016-06-01 荆门宏图特种飞行器制造有限公司 LNG storage tank

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0715119A2 (en) * 1994-12-03 1996-06-05 MESSER GRIESHEIM GmbH Process for vaporizing liquefied gases at low temperatures
CN102588730A (en) * 2012-02-24 2012-07-18 南京亚格泰新能源材料有限公司 Cooling silane intermediate storage tank with outer coiled pipe
WO2014177761A1 (en) * 2013-04-29 2014-11-06 Wärtsilä Finland Oy Fuel tank arrangement for liquefied gas in a marine vessel
CN104295889A (en) * 2014-10-20 2015-01-21 中国海洋石油总公司 Vaporized gas recovery system of LNG (Liquid Natural Gas) receiving station terminal
CN104389697A (en) * 2014-10-29 2015-03-04 沪东重机有限公司 Supercharged-gasifying gas supply system and method
CN105627096A (en) * 2015-09-11 2016-06-01 荆门宏图特种飞行器制造有限公司 LNG storage tank

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