CN116201662A - Ship LNG engine air supply and reliquefaction composite system - Google Patents
Ship LNG engine air supply and reliquefaction composite system Download PDFInfo
- Publication number
- CN116201662A CN116201662A CN202211660651.4A CN202211660651A CN116201662A CN 116201662 A CN116201662 A CN 116201662A CN 202211660651 A CN202211660651 A CN 202211660651A CN 116201662 A CN116201662 A CN 116201662A
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- Prior art keywords
- gas
- liquid
- outlet
- fluid communication
- compressor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
- F02M21/0215—Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0287—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers characterised by the transition from liquid to gaseous phase ; Injection in liquid phase; Cooling and low temperature storage
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- 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)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Combustion & Propulsion (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 and reliquefaction composite system, which comprises a storage tank for storing natural gas, a gasifier and a compressor, wherein the storage tank comprises a booster pump, a first throttling device and a spiral coil, the booster pump comprises an inlet and an outlet, the spiral coil also comprises an inlet and an outlet, the inlet of the booster pump is in fluid communication with the storage tank, and the outlet of the booster pump and the first throttling device. The marine LNG engine air supply system has the advantages that: the natural gas in the LNG storage tank can be cooled by utilizing the cold energy generated by vaporization before the LNG enters the engine, and the flow rate of the natural gas supplied to the engine and the flow rate of the natural gas used for reliquefaction can be dynamically adjusted according to the load of the engine, so that the compressor in the gas supply system can maintain high operation efficiency.
Description
Technical Field
The invention relates to the technical field of liquefied natural gas application of ship engines, in particular to a ship LNG engine gas supply and reliquefaction composite system.
Background
Natural gas is increasingly used as a fuel of ship engines as a clean energy source, but the gaseous natural gas occupies a large space and is inconvenient to transport and store, so that the gaseous natural gas NG is liquefied into liquefied natural gas LNG to be stored in a storage tank by adopting pressurization and cooling means, but the liquefied natural gas cannot be directly used by the engines, and the liquefied natural gas can be used only by changing the gaseous state again; meanwhile, a large temperature difference exists between the low-temperature LNG in the storage tank and the external environment, part of LNG can be evaporated into a gaseous state after the liquefied natural gas absorbs external heat and the pressure in the storage tank is increased, and in order to solve the technical problem, the ship LNG storage tank is also required to be provided with a reliquefaction system for releasing the heat in the gaseous natural gas so that the natural gas is kept in a low-temperature liquid state, and the LNG storage tank can safely operate, so that the production cost is high; and moreover, the operation of the ship LNG engine gas supply system and the operation of the reliquefaction system respectively consume a large amount of energy, and the operation cost is high.
Disclosure of Invention
The invention mainly solves the technical problems existing in the prior art, and provides the ship LNG engine gas supply and reliquefaction composite system which is provided with only one compressor, can be used for reliquefaction of natural gas, can also be used for reliquefaction of natural gas, has lower cost, and can dynamically adjust the flow of the natural gas supplied to the engine and the flow of the natural gas used for reliquefaction according to the load of the engine, so that the compressor in the gas supply system can be kept at higher operation efficiency.
The invention solves the technical problems existing in the prior art through the following technical scheme:
the utility model provides a boats and ships LNG engine air feed and reliquefaction combined system, includes a storage tank, a gasifier, a compressor that are used for storing natural gas, boats and ships LNG engine air feed and reliquefaction combined system still include a booster pump and a gas-liquid separator, the booster pump include an entry and export, the gas-liquid separator include a liquid interface and a liquid outlet, liquid interface and the liquid outlet be close to the bottom of gas-liquid separator arrange, the gas outlet be close to the top of gas-liquid separator arrange, the entry of booster pump with storage tank fluid communication, the export of booster pump with liquid interface fluid communication, the liquid outlet the gasifier with the induction port of compressor fluid communication in order.
As a more preferable technical scheme of the invention, the marine LNG engine air supply and reliquefaction composite system further comprises a three-way valve and a cooler, wherein a spiral coil is arranged in the storage tank, the spiral coil also comprises an inlet and an outlet, the air-liquid separator is arranged between the outlet of the spiral coil and the gasifier, the compressor comprises a gas supplementing port, the air-liquid separator is provided with a gas-liquid mixing port, the outlet of the spiral coil is in fluid communication with the gas-liquid mixing port, and the gas outlet is in fluid communication with the gas supplementing port of the compressor;
the three-way valve comprises three interfaces, namely a first connecting port, a second connecting port and a third connecting port, the cooler comprises a cooler inlet and a cooler outlet, the first connecting port is in fluid communication with the exhaust port of the compressor, the second connecting port is in fluid communication with the cooler inlet, the third connecting port is in fluid communication with the engine, and natural gas discharged from the exhaust port of the compressor can flow to the cooler and the engine respectively through the three-way valve; the cooler outlet is in fluid communication with one end of a second restriction, and the other end of the second restriction is in fluid communication with the inlet of the helical coil.
As a more preferable technical scheme of the invention, the air outlet is in fluid communication with a superheater, and the superheater is in fluid communication with the air supplementing port of the compressor.
As a better technical scheme of the invention, the booster pump is a bidirectional pump, and can discharge the natural gas in the storage tank into the gas-liquid separator and also discharge the natural gas in the gas-liquid separator into the storage tank.
As a more preferable technical scheme of the invention, the three-way valve is a proportional three-way valve, and can distribute the flow of natural gas flowing to the cooler and the engine.
The ship LNG engine air supply and reliquefaction composite system has the advantages that: the natural gas re-liquefying device has the advantages that only one compressor is arranged, the natural gas re-liquefying device can be used for re-liquefying natural gas, the natural gas re-liquefying device can also be used for re-gasifying natural gas, the cost is low, the flow of the natural gas supplied to the engine and the flow of the natural gas used for re-liquefying can be dynamically adjusted according to the load of the engine, and the compressor in the gas supply system can be kept at high operation efficiency.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a marine LNG engine supply and reliquefaction composite system of the present invention;
wherein:
1. a storage tank; 11. a spiral coil;
2. a gasifier; 3. a compressor; 4. a booster pump;
5. a gas-liquid separator; 51. a liquid interface; 52. a liquid outlet; 53. an air outlet; 54. a gas-liquid mixing port;
6. a superheater;
7. a three-way valve; 71. a first connection port; 72. a second connection port; 73. a third connection port;
8. a cooler; 81. a cooler inlet; 82. a cooler outlet;
9. a throttle device.
Detailed Description
The following detailed description of the preferred embodiments of the invention is provided to enable those skilled in the art to more readily understand the advantages and features of the invention and to make a clear and concise definition of the scope of the invention.
The ship LNG engine air supply and reliquefaction composite system has the advantages that: the natural gas re-liquefying device has the advantages that only one compressor is arranged, the natural gas re-liquefying device can be used for re-liquefying natural gas, the natural gas re-liquefying device can also be used for re-gasifying natural gas, the cost is low, the flow of the natural gas supplied to the engine and the flow of the natural gas used for re-liquefying can be dynamically adjusted according to the load of the engine, and the compressor in the gas supply system can be kept at high operation efficiency.
As shown in fig. 1, a composite system for supplying and reliquefying LNG engine of a ship includes a tank 1 for storing natural gas, a vaporizer 2, a compressor 3, a booster pump 4, a gas-liquid separator 5, a superheater 6, a three-way valve 7, and a cooler 8.
The storage tank 1 is used for storing liquefied natural gas, the liquefied natural gas in the storage tank gradually rises in temperature and evaporates into a gaseous state after absorbing heat, if the gaseous natural gas gradually increases, the pressure in the storage tank 1 can be too high, so that the storage tank 1 can not safely run, and the storage tank 1 is liquefied again by adopting a re-liquefying technology more commonly. The spiral coil 11 is arranged in the storage tank 1, the spiral coil 11 also comprises an inlet and an outlet, the spiral coil 11 can be arranged on the inner wall surface of the storage tank 1 in a fitting way or not, when the spiral coil 11 is not arranged on the inner wall surface of the storage tank 1 in a fitting way, the size of the spiral coil 11 is smaller, and more spiral coils 11 can be arranged in the storage tank 1, so that a larger heat exchange area is achieved, and better heat transfer effect is facilitated; if the spiral coil 11 is disposed to be fitted to the inner wall surface of the storage tank 1, the spiral coil 11 can be easily fixed to the inner wall surface of the storage tank 1, and the spiral coil 11 is prevented from vibrating during operation.
The gas-liquid separator 5 comprises a liquid interface 51, a liquid outlet 52, a gas outlet 53 and a gas-liquid mixing port 54, wherein the liquid interface 51 and the liquid outlet 52 are arranged near the bottom of the gas-liquid separator 5, the gas outlet 53 is arranged near the top of the gas-liquid separator 5, and the gas-liquid mixing port 54 is arranged near the upper part of the gas-liquid separator 5; the gas-liquid two-phase natural gas entering the storage tank 1 from the liquid interface 51 or the gas-liquid mixing port 54 is separated into liquid natural gas and gaseous natural gas under the action of gravity;
the inlet of the booster pump 4 is in fluid communication with the reservoir 1, the outlet of the booster pump 4 is in fluid communication with the liquid interface 51; the booster pump 4 also includes an inlet and an outlet, the booster pump 4 being a bi-directional pump capable of pumping the fluid of the inlet to the outlet thereof and the fluid of the outlet to the inlet thereof, that is, the booster pump 4 is capable of discharging the natural gas in the tank 1 to the gas-liquid separator 5 and discharging the natural gas in the gas-liquid separator 5 to the tank 1;
the liquid outlet 52, the gasifier 2 and the air inlet of the compressor 3 are in fluid communication in sequence, and the liquefied natural gas in the gas-liquid separator 5 can be discharged from the liquid outlet 52 to the gasifier 2, gasified in the gasifier 2, flowed to the air inlet of the compressor 3, compressed to a high pressure state in the compressor 3 and then discharged to the engine.
The gas-liquid separator 5 is arranged between the outlet of the spiral coil 11 and the gasifier 2, the compressor 3 comprises a gas-supplementing port, a gas-liquid mixing port 54 is arranged on the gas-liquid separator 5, the outlet of the spiral coil 11 is in fluid communication with the gas-liquid mixing port 54, and the gas outlet 53, the superheater 6 and the gas-supplementing port of the compressor 3 are in fluid communication in sequence; the superheater 6 may not be disposed between the air outlet 53 and the air supply port of the compressor 3, so long as no liquid is carried in the air discharged from the air outlet 53, for example, a filter may be disposed at the air outlet 53 to filter out the mixed liquid in the air, because the liquid may damage the compressor 3 by the action of liquid impact. However, the addition of the superheater 6 increases the enthalpy of the gas entering the compressor 3, which is advantageous for increasing the enthalpy of the gas at the outlet of the compressor 3, and thus for increasing the thermal efficiency of the engine.
The three-way valve 7 comprises three ports, namely a first port 71, a second port 72 and a third port 73, respectively, the cooler 8 comprising a cooler inlet 81 and a cooler outlet 82, the first port 71 being in fluid communication with the exhaust of the compressor 3, the second port 72 being in fluid communication with the cooler inlet 81, the third port 73 being for fluid communication with the engine, natural gas exhausted from the exhaust of the compressor 3 being capable of flowing through the three-way valve 7 to the cooler 8 and the engine, respectively; the cooler outlet 82 is in fluid communication with one end of a restriction 9, and the other end of the restriction 9 is in fluid communication with the inlet of the helical coil 11.
The three-way valve 7 is a proportional three-way valve capable of distributing the flow rate of the natural gas flowing to the cooler 8 and the engine and also capable of completely closing the second connection port 72 or the third connection port 73.
The gas-liquid separator 5 is provided with a liquid level sensor, and the liquid level sensor can detect the liquid level height in the gas-liquid separator 5 and control the rotation direction of the booster pump 4 according to the liquid level height so as to control the liquid level height in the gas-liquid separator 5; when the liquid level in the gas-liquid separator 5 is too low, the liquid level sensor can control the rotation of the booster pump 4, so that the natural gas in the storage tank 1 can flow to the gas-liquid separator 5 and further the liquid level in the gas-liquid separator 5 is gradually increased, when the liquid level in the gas-liquid separator 5 is too high, the liquid level sensor can control the rotation of the booster pump 4, so that the liquid natural gas in the gas-liquid separator 5 is gradually discharged to the storage tank 1, and the structure ensures that the liquid level in the gas-liquid separator 5 can be stably kept at a proper height, not only can ensure that the air suction port of the compressor 3 has stable natural gas supply, but also can avoid that the liquid natural gas is discharged to the air supplementing port of the compressor 3 from the air outlet 53, and the liquid natural gas enters the compressor 3 from the air supplementing port of the compressor 3 and damages the compressor 3 through the action of liquid impact.
When the third connection port 73 of the three-way valve 7 is opened, at least a part of the high-temperature and high-pressure gaseous natural gas discharged from the exhaust port of the compressor 3 is discharged to the cooler 8 through the second connection port 72 and the cooler inlet 81, the high-temperature and high-pressure gaseous natural gas gradually condenses to be liquid in the cooler 8 and finally is discharged through the cooler outlet 82, and the gas throttled to be low-temperature and low-pressure mixed gas is discharged through the throttling device 9 and then enters the spiral coil 11, at this time, the low-temperature and low-pressure mixed gas continuously absorbs heat from the liquid or/and natural gas in the storage tank 1 in the spiral coil 11 and heats up, part of the liquid natural gas is continuously gasified, the mixed gas in the spiral coil 11 is finally discharged to the gas-liquid separator 5 and is separated in the gas-liquid separator 5, and the amount of the liquid natural gas in the gas-liquid separator 5 continuously increases or decreases in the process; if the liquid level of the lng in the gas-liquid separator 5 is too high, the lng may enter the compressor 3 through the gas outlet 53 and the gas-compensating port of the compressor 3 and damage the compressor 3; if the liquid level of the liquefied natural gas in the gas-liquid separator 5 is too low, the amount of the natural gas entering the air inlets of the gasifier 2 and the compressor 3 is insufficient, so that the engine cannot work normally, a liquid level sensor is arranged on the gas-liquid separator 5, and the booster pump 4 is designed as a bidirectional pump to better control the liquid level in the gas-liquid separator 5, so that the air supply amount of the compressor 3 can be ensured, and the safe operation of the compressor 3 can be ensured.
The above is only a design idea of some embodiments of the present invention, and the present invention can be extended to connect more functional modules at the same time under the condition of system permission, so as to extend the functions to the maximum extent.
The foregoing is merely illustrative of specific embodiments of the present invention, and the scope of the invention is not limited thereto, but any changes or substitutions that do not undergo the inventive effort should be construed as falling within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope defined by the claims.
Claims (5)
1. A marine LNG engine gas supply and re-liquefaction complex system comprising a tank (1) for storing natural gas, a vaporizer (2), a compressor (3), characterized in that: the marine LNG engine air feed and reliquefaction combined system also comprises a booster pump (4) and a gas-liquid separator (5), the booster pump (4) comprises an inlet and an outlet, the gas-liquid separator (5) comprises a liquid interface (51) and a liquid outlet (52), the liquid interface (51) and the liquid outlet (52) are close to the bottom of the gas-liquid separator (5), the air outlet (53) is close to the top of the gas-liquid separator (5), the inlet of the booster pump (4) is in fluid communication with the storage tank (1), the outlet of the booster pump (4) is in fluid communication with the liquid interface (51), and the liquid outlet (52), the gasifier (2) and the air suction inlet of the compressor (3) are in sequential fluid communication.
2. The marine LNG engine supply and re-liquefaction complex system of claim 1, wherein: the marine LNG engine gas supply and reliquefaction composite system further comprises a three-way valve (7) and a cooler (8), wherein a spiral coil pipe (11) is arranged in the storage tank (1), the spiral coil pipe (11) also comprises an inlet and an outlet, the gas-liquid separator (5) is arranged between the outlet of the spiral coil pipe (11) and the gasifier (2), the compressor (3) comprises a gas supplementing port, the gas-liquid separator (5) is provided with a gas-liquid mixing port (54), the outlet of the spiral coil pipe (11) is in fluid communication with the gas-liquid mixing port (54), and the gas outlet (53) is in fluid communication with the gas supplementing port of the compressor (3);
the three-way valve (7) comprises three interfaces, namely a first connecting interface (71), a second connecting interface (72) and a third connecting interface (73), the cooler (8) comprises a cooler inlet (81) and a cooler outlet (82), the first connecting interface (71) is in fluid communication with the exhaust port of the compressor (3), the second connecting interface (72) is in fluid communication with the cooler inlet (81), the third connecting interface (73) is used for being in fluid communication with an engine, and natural gas discharged from the exhaust port of the compressor (3) can flow to the cooler (8) and the engine respectively through the three-way valve (7); the cooler outlet (82) is in fluid communication with one end of a restriction (9), and the other end of the restriction (9) is in fluid communication with the inlet of the spiral coil (11).
3. The marine LNG engine supply and re-liquefaction complex system of claim 2, wherein: the air outlet (53) is in fluid communication with a superheater (6), and the superheater (6) is in fluid communication with the air supply port of the compressor (3).
4. The marine LNG engine supply and re-liquefaction complex system of claim 2, wherein: the booster pump (4) is a two-way pump, natural gas in the storage tank (1) can be discharged into the gas-liquid separator (5) and natural gas in the gas-liquid separator (5) can be discharged into the storage tank (1), a liquid level sensor is arranged on the gas-liquid separator (5), and the liquid level sensor can detect the liquid level in the gas-liquid separator (5) and control the rotation direction of the booster pump (4) according to the liquid level so as to control the liquid level in the gas-liquid separator (5).
5. The marine LNG engine supply and re-liquefaction complex system of claim 2, wherein: the three-way valve (7) is a proportional three-way valve capable of distributing the flow of natural gas to the cooler (8) and the engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211660651.4A CN116201662A (en) | 2022-12-23 | 2022-12-23 | Ship LNG engine air supply and reliquefaction composite system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211660651.4A CN116201662A (en) | 2022-12-23 | 2022-12-23 | Ship LNG engine air supply and reliquefaction composite system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116201662A true CN116201662A (en) | 2023-06-02 |
Family
ID=86516351
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211660651.4A Pending CN116201662A (en) | 2022-12-23 | 2022-12-23 | Ship LNG engine air supply and reliquefaction composite system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116201662A (en) |
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2022
- 2022-12-23 CN CN202211660651.4A patent/CN116201662A/en active Pending
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