CN116146384A - Marine LNG engine air feed system - Google Patents
Marine LNG engine air feed system Download PDFInfo
- Publication number
- CN116146384A CN116146384A CN202310055876.5A CN202310055876A CN116146384A CN 116146384 A CN116146384 A CN 116146384A CN 202310055876 A CN202310055876 A CN 202310055876A CN 116146384 A CN116146384 A CN 116146384A
- Authority
- CN
- China
- Prior art keywords
- natural gas
- compressor
- outlet
- flow passage
- heat recovery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
- F28D2021/0026—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for combustion engines, e.g. for gas turbines or for Stirling engines
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a marine LNG engine air supply system, which comprises a storage tank for storing natural gas, a gasifier and a first compressor for compressing gaseous natural gas, wherein the first compressor comprises a first compressor air suction port and a first compressor air discharge port, the first compressor air discharge port is used for being connected with a natural gas engine, the marine LNG engine air supply system further comprises a reliquefaction system, and the reliquefaction system comprises at least one second compressor for compressing the gaseous natural gas, at least one heat recovery heat exchanger and a throttle valve. The marine LNG engine air supply system has the advantages that: the heat recovery heat exchanger is arranged, so that the heat discharged by the reliquefaction system can be utilized to heat and gasify the liquid natural gas, the cold source quality of the reliquefaction system can be improved, the heat source quality of the air supply system can be improved, the heat exchanger is smaller in size, and the exhaust temperature of the air supply system can be improved.
Description
Technical Field
The invention relates to the field of engine air supply systems, in particular to a marine LNG engine air supply system.
Background
Compared with an engine using traditional fuel, the natural gas engine can emit fewer pollutants, but when a ship uses the natural gas engine, a storage tank for storing low-temperature liquid natural gas is required to be carried, however, the storage tank inevitably absorbs external heat to cause gasification of the liquid natural gas, and a re-liquefying device is required to be used for re-liquefying the liquid natural gas periodically; meanwhile, when the liquid natural gas is supplied to the engine for use, the liquid natural gas is gasified into gaseous natural gas and then is transmitted to the engine; the reliquefaction device and the gasification device can comprise one or more heat exchangers, which not only occupy larger ship space and have higher cost, but also have low overall heat efficiency.
Disclosure of Invention
The invention mainly solves the technical problems in the prior art, and provides the marine LNG engine air supply system with the heat recovery heat exchanger, which can heat and gasify the liquid natural gas by utilizing the heat discharged by the reliquefaction system, can improve the cold source quality of the reliquefaction system, can improve the heat source quality of the air supply system, ensures that the heat exchanger has smaller size, and can improve the exhaust temperature of the air supply system.
The invention solves the technical problems existing in the prior art through the following technical scheme:
a marine LNG engine air supply system comprising a tank for storing natural gas, a booster pump, a vaporizer, and a first compressor for compressing gaseous natural gas, said booster pump being configured to deliver liquid natural gas stored in said tank to said vaporizer, said liquid natural gas within said vaporizer being capable of absorbing heat from the environment through said vaporizer and vaporizing, said first compressor comprising a first compressor air intake and a first compressor air exhaust, said first compressor air exhaust being configured to connect to a natural gas engine, said marine LNG engine air supply system further comprising a re-liquefaction system comprising at least one second compressor for compressing gaseous natural gas, at least one heat recovery heat exchanger, and a throttle valve, said throttle valve comprising a throttle valve inlet and a throttle valve outlet, said second compressor comprising a second compressor air intake and a second compressor air exhaust, said booster pump outlet being in communication with one end of said vaporizer and said other end of said vaporizer being in communication with said second compressor air intake enabling the liquid natural gas to be delivered to said vaporizer from said vaporizer to the air intake and enabling the liquid natural gas to be delivered to said vaporizer;
the heat recovery heat exchanger comprises a first runner and a second runner, the first runner and the second runner are respectively provided with an inlet and an outlet, fluid in the two runners can transfer heat through the heat recovery heat exchanger, the exhaust port of the second compressor is in fluid communication with the inlet of the first runner, the outlet of the first runner is in fluid communication with the inlet of the throttle valve, the outlet of the throttle valve is in fluid communication with the storage tank, and natural gas returns to the storage tank after being throttled in the throttle valve to a low-temperature and low-pressure state;
the outlet of the booster pump is also in fluid communication with the inlet of the second flow passage of the heat recovery heat exchanger, and the outlet of the second flow passage of the heat recovery heat exchanger is in fluid communication with the air suction port of the first compressor; the liquefied natural gas can absorb heat from the gaseous natural gas in the first flow passage when flowing through the second flow passage and gasify the gaseous natural gas into a gaseous state, and then the gaseous natural gas enters the first compressor.
As a more preferable technical scheme of the invention, the reliquefaction system comprises at least two second compressors connected in series and heat recovery heat exchangers the number of which is the same as that of the second compressors, wherein the inlet of the first flow passage of each heat recovery heat exchanger is in fluid communication with the inlet of the second compressor, and the second flow passages of the plurality of heat recovery heat exchangers are arranged in series, so that the high-temperature gaseous natural gas discharged from the exhaust port of each second compressor can release heat to the natural gas in the second flow passage through the heat recovery heat exchanger and liquefy into liquid state in the first flow passage of the last heat recovery heat exchanger, and the liquid natural gas discharged into the second flow passage of the heat recovery heat exchanger in the storage tank is gradually gasified in the second flow passage of the heat recovery heat exchanger and enters the first compressor after reaching a superheated state.
As a more preferable technical scheme of the invention, the marine LNG engine air supply system further comprises a gas-liquid separator and an ejector, the gas-liquid separator comprises an inlet, a liquid outlet and an air outlet, a sprayer is arranged in the storage tank, the ejector comprises an ejection inlet, an ejection outlet and an ejection outlet, the throttle valve outlet is in fluid communication with the inlet, the liquid outlet is in fluid communication with the sprayer, and the air outlet is in fluid communication with the ejection outlet; the outlet of the booster pump is communicated with one end of the gasifier through a one-way valve; the outlet of the booster pump is also in fluid communication with the inlet of the second flow passage of the heat recovery heat exchanger through a one-way valve.
The marine LNG engine air supply system has the advantages that: the heat recovery heat exchanger is arranged, so that the heat discharged by the reliquefaction system can be utilized to heat and gasify the liquid natural gas, the cold source quality of the reliquefaction system can be improved, the heat source quality of the air supply system can be improved, the heat exchanger is smaller in size, and the exhaust temperature of the air supply system can be improved.
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 air supply system of the present invention;
wherein:
1. a storage tank; 11. a sprayer;
2. a gasifier;
3. a first compressor; 31. a first compressor suction port; 32. a first compressor discharge port;
4. a second compressor; 41. a second compressor suction port; 42. a second compressor discharge port;
5. a heat recovery heat exchanger;
6. a throttle valve; 61. a throttle valve inlet; 62. a throttle valve outlet;
7. a gas-liquid separator; 71. an inlet; 72. a liquid outlet; 73. an air outlet;
8. an ejector; 81. an injection inlet; 82. an injection outlet; 83. an injection port;
9. and a booster pump.
Description of the embodiments
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 marine LNG engine air supply system has the advantages that: the heat recovery heat exchanger is arranged, so that the heat discharged by the reliquefaction system can be utilized to heat and gasify the liquid natural gas, the cold source quality of the reliquefaction system can be improved, the heat source quality of the air supply system can be improved, the heat exchanger is smaller in size, and the exhaust temperature of the air supply system can be improved.
As shown in fig. 1, a marine LNG engine gas supply system includes a tank 1 for storing natural gas, a booster pump 9, a vaporizer 2, and a first compressor 3 for compressing gaseous natural gas, the booster pump 9 is used for feeding liquefied natural gas stored in the tank 1 into the vaporizer 2, the liquefied natural gas located in the vaporizer 2 can absorb heat from the outside through the vaporizer 2 and vaporize, the first compressor 3 includes a first compressor suction port 31 and a first compressor discharge port 32, the first compressor discharge port 32 is used for connecting a natural gas engine, and the first compressor 3 compresses low-pressure natural gas discharged from the first compressor suction port 31 to a high-pressure state and supplies the compressed low-pressure natural gas to the natural gas engine;
the marine LNG engine gas supply system further comprises a re-liquefying system, the re-liquefying system comprises two second compressors 4 connected in series for compressing gaseous natural gas, and two heat recovery heat exchangers 5 and a throttle valve 6, the throttle valve 6 comprises a throttle valve inlet 61 and a throttle valve outlet 62, the second compressor 4 comprises a second compressor gas suction port 41 and a second compressor gas discharge port 42, one end of the gasifier 2 is communicated with the liquid natural gas in the storage tank 1, the other end of the gasifier 2 is communicated with the second compressor gas suction port 41, so that the gasifier 2 can extract the liquid natural gas from the storage tank 1 and transfer heat absorbed by the gasifier 2 from the outside to the liquid natural gas to gasify the liquid natural gas and then send the liquid natural gas into the second compressor 4; the second compressor 4 compresses the gaseous natural gas into a high temperature and high pressure state, and then sends the compressed gaseous natural gas into the heat recovery heat exchanger 5 connected with the exhaust port thereof to release heat and simultaneously cool and reduce pressure, and it should be noted that the high temperature, high pressure, low temperature and low pressure states refer not to absolute high temperature, high pressure, low temperature or low pressure states but to relative high temperature, high pressure, low temperature or low pressure states in the marine LNG engine air supply system disclosed by the invention, and are not repeated. The reliquefaction system in the present embodiment includes two second compressors 4 and two heat recovery heat exchangers 5, and in other embodiments, the reliquefaction system may include only one second compressor 4 and one heat recovery heat exchanger 5, or the reliquefaction system may include three or more second compressors 4 and more heat recovery heat exchangers 5, and the number of the heat recovery heat exchangers 5 may be greater than that of the second compressors 4, so that the gaseous natural gas of low temperature and low pressure is compressed into a high temperature and high pressure state using the second compressors 4 and heat may be released and liquefied in the heat recovery heat exchangers 5;
the heat recovery heat exchanger 5 comprises a first flow passage and a second flow passage, each having an inlet and an outlet, the fluid in both flow passages being capable of transferring heat through the heat recovery heat exchanger 5, the second compressor discharge 42 being in fluid communication with the inlet of the first flow passage, the outlet of the first flow passage being in fluid communication with the throttle inlet 61; the outlet of the booster pump 9 is in fluid communication with the inlet of the gasifier 2 and the second flow path via a three-way valve, so that the feeding of liquid natural gas into the second flow path of the gasifier 2 and the heat recovery heat exchanger 5 can be achieved using only one booster pump 9; in order to avoid natural gas flowing between the gasifier 2 and the second flow channel of the heat recovery heat exchanger 5, a non-return valve may also be arranged before the inlet of the gasifier 2 and before the inlet of the second flow channel of the heat recovery heat exchanger 5;
the outlet of the second flow passage is in fluid communication with the first compressor suction 31; so that the liquefied natural gas discharged into the second flow passage of the heat recovery heat exchanger 5 in the storage tank gradually absorbs heat and gasifies in the second flow passages of the plurality of heat recovery heat exchangers 5 and enters the first compressor 3 after reaching a superheated state.
According to the re-liquefying system, the liquefied natural gas in the storage tank 1 is sent into the gasifier, so that the liquefied natural gas in the loop of the re-liquefying system can absorb a large amount of heat from the outside to gasify, and the liquefied natural gas is compressed and heated by the second compressor 4 in the re-liquefying system, so that the quality of heat supplied to the outside by the re-liquefying system can be remarkably improved, and the re-liquefying system is characterized in that the heat supply efficiency is improved; the liquefied natural gas must be gasified by absorbing heat first to be gaseous and then supplied to the first compressor 3, and a large amount of heat is required to be absorbed during gasification, so that the liquefied natural gas can be used as a better cold source, and therefore, the reliquefaction system in the marine LNG engine air supply system disclosed by the invention has a better cold source, and the air supply system also has a better heat source, and the heat source and the cold source are higher in quality, so that the heat recovery heat exchanger 5 can be smaller in size, thereby being beneficial to reducing precious space on a ship, the better heat source quality is also beneficial to improving the exhaust temperature of the air supply system, the thermal efficiency of the engine is beneficial to improving, and the better cold source can also enable the gasified natural gas in the reliquefaction system to be liquefied back into the storage tank 1.
The reliquefaction system comprises at least two second compressors 4 and heat recovery heat exchangers 5 in series, the number of the second compressors is identical to that of the second compressors 4, the inlet of the first flow passage of each heat recovery heat exchanger 5 is in fluid communication with the inlet of the second compressor 4, the second flow passages of the plurality of heat recovery heat exchangers 5 are arranged in series, so that high-temperature gaseous natural gas discharged from the exhaust port of each second compressor 4 can release heat to the natural gas in the second flow passage through the heat recovery heat exchanger 5 and be liquefied into liquid state in the first flow passage of the last heat recovery heat exchanger 5, and the liquid natural gas discharged into the second flow passage of the heat recovery heat exchanger 5 in the storage tank 1 is gradually gasified in the second flow passage of the heat recovery heat exchanger 5 to reach a superheated state and then enters the first compressor 3.
The marine LNG engine air supply system also comprises a gas-liquid separator 7, an ejector 8, a first one-way valve 101, a second one-way valve 102 and a third one-way valve 103; the outlet of the booster pump 9 and one end of the gasifier 2 form a unidirectional fluid communication structure through the first one-way valve 101; the outlet of the booster pump 9 and the inlet of the second flow channel of the heat recovery heat exchanger 5 form a unidirectional fluid communication structure through the second one-way valve 102; the first check valve 101 and the second check valve 102 are provided for the purpose of avoiding a reverse flow phenomenon of natural gas in the pipeline upon fluctuation of the compressor 3. The gas-liquid separator 7 comprises an inlet 71, a liquid outlet 72 and an air outlet 73, a sprayer 11 is arranged in the storage tank 1, the injector 8 comprises an injection inlet 81, an injection outlet 82 and an injection port 83, the throttle valve outlet 62 is in fluid communication with the inlet 71, the liquid outlet 72 and the sprayer are in fluid communication with each other through the third one-way valve 103 to form a one-way fluid communication structure, and the air outlet 73 is in fluid communication with the injection port 83. When the load of the LNG engine for the ship increases and more natural gas is required, it will signal the LNG engine supply system for the ship that more natural gas is required, and the LNG engine supply system for the ship will control the first compressor 3 to increase the load so that the first compressor 3 can supply more natural gas, which will increase the flow rate of natural gas flowing through the second flow path of the heat recovery heat exchanger 5, but the flow rate of natural gas flowing through the first flow path of the heat recovery heat exchanger 5 is not increased, resulting in mismatching of the flow rates of the two flow paths of the heat recovery heat exchanger 5, which will not only result in the system failing to fully utilize the thermal capacity of the gasifier, failing to supply natural gas at higher temperature to the LNG engine, but also may result in the natural gas carrying liquid flowing through the second flow path of the heat recovery heat exchanger, thereby losing the first compressor 3 and the external LNG engine. By arranging the ejector 8, the first compressor 3 can directly pump the natural gas flowing through the first flow passage of the heat recovery heat exchanger 5 through the third one-way valve 103 under the condition of low cost increase, so that the flows in the first flow passage and the second flow passage of the heat recovery heat exchanger 5 can be mutually matched, and the specific process is that when the load of the first compressor 3 is larger, the flow of the exhaust port of the first compressor is naturally increased, the flow through the ejector 8 is naturally increased, more natural gas can be naturally pumped from the gas-liquid separator 7, the liquid outlet of the gas-liquid separator 7 is connected with the sprayer 11 arranged in the storage tank 1 through the third one-way valve 103, the natural gas in the storage tank 1 cannot enter the gas-liquid separator 7 through the sprayer 11 and the third one-way valve 103, so that the outlet pressure of the throttle valve 1 is reduced, the front-rear pressure difference of the throttle valve 6 is naturally increased, the flow of the natural gas flowing through the throttle valve 6 is promoted to be increased, the heat recovery natural gas flowing through the first flow passage 5 of the heat recovery heat exchanger can be increased, and the natural gas flowing through the heat recovery heat exchanger 5 can be recovered through the first flow passage of the heat exchanger 5 is matched; similarly, when the load of the first compressor 3 decreases, the outlet flow rate of the first compressor 3 decreases, and the flow rate of the natural gas drawn from the gas-liquid separator 7 through the ejector 8 also decreases, which results in a decrease in the flow rate of the natural gas flowing through the first flow passage and the second flow passage of the heat recovery heat exchanger 5, respectively. In summary, by providing the ejector 8, the flow rates of the first flow channel and the second flow channel of the heat recovery heat exchanger 5 can be more matched, so that the heat absorption capacity of the gasifier 2 can be fully utilized, and the natural gas in the second flow channel of the heat recovery heat exchanger 5 can be prevented from carrying liquid when entering the first compressor 3. There are, of course, also more ways to achieve this technical effect, for example, a corresponding control module may be added to the marine LNG engine air supply system and corresponding logic written, and when the load of the first compressor 3 increases, the control device may control the load of the second compressor to increase so that the flows through the first and second flow paths of the heat recovery heat exchanger 5 match, but this way is costly, and when there are a plurality of second compressors in the marine LNG engine air supply system, the complexity of the control logic in this way will increase significantly, the cost will also increase significantly, and the reliability of the system will also be lower.
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 (3)
1. The utility model provides a marine LNG engine air feed system, includes a storage tank (1) that is used for storing natural gas, a booster pump (9), a vaporizer (2) and a first compressor (3) that are used for compressing gaseous natural gas, booster pump (9) be used for with the liquid natural gas that stores in storage tank (1) send into vaporizer (2), the liquid natural gas that is located in vaporizer (2) can absorb heat and gasify from the external world through vaporizer (2), first compressor (3) include a first compressor induction port (31) and a first compressor gas vent (32), first compressor gas vent (32) be used for connecting natural gas engine, its characterized in that: the marine LNG engine gas supply system further comprises a reliquefaction system, the reliquefaction system comprises at least one second compressor (4) for compressing gaseous natural gas, at least one heat recovery heat exchanger (5) and a throttle valve (6), the throttle valve (6) comprises a throttle inlet (61) and a throttle outlet (62), the second compressor (4) comprises a second compressor gas suction port (41) and a second compressor gas discharge port (42), the outlet of the booster pump (9) is communicated with one end of the gasifier (2), the other end of the gasifier (2) is communicated with the second compressor gas suction port (41), so that the gasifier (2) can extract liquid natural gas from the storage tank (1) and transfer heat absorbed by the gasifier (2) from the outside to the liquid natural gas to gasify the liquid natural gas, and then the liquid natural gas is sent to the second compressor (4);
the heat recovery heat exchanger (5) comprises a first flow passage and a second flow passage, wherein the first flow passage and the second flow passage are respectively provided with an inlet and an outlet, fluid in the two flow passages can transfer heat through the heat recovery heat exchanger (5), the second compressor exhaust port (42) is in fluid communication with the inlet of the first flow passage, the outlet of the first flow passage is in fluid communication with the throttle inlet (61), the throttle outlet (62) is in fluid communication with the storage tank (1), and natural gas returns to the storage tank (1) after being throttled into a low-temperature and low-pressure state in the throttle valve (6);
the outlet of the booster pump (9) is also in fluid communication with the inlet of the second flow passage of the heat recovery heat exchanger (5), and the outlet of the second flow passage of the heat recovery heat exchanger (5) is in fluid communication with the first compressor suction port (31); the liquefied natural gas can absorb heat from the gaseous natural gas in the first flow passage when flowing through the second flow passage and gasify the gaseous natural gas into a gaseous state, and then the gaseous natural gas enters the first compressor (3).
2. The marine LNG engine air supply system of claim 1, wherein: the re-liquefying system comprises at least two second compressors (4) and heat recovery heat exchangers (5) which are connected in series and are consistent with the number of the second compressors (4), wherein the inlet of the first flow passage of each heat recovery heat exchanger (5) is in fluid communication with the inlet of the second compressor (4), and the second flow passages of the plurality of heat recovery heat exchangers (5) are arranged in series, so that the high-temperature gaseous natural gas discharged from the exhaust port of each second compressor (4) can release heat to the natural gas in the second flow passage through the heat recovery heat exchangers (5) and liquefy into liquid state in the first flow passage of the last heat recovery heat exchanger (5), and the liquid natural gas discharged into the second flow passage of the heat recovery heat exchanger (5) in the storage tank (1) is gasified gradually in the second flow passage of the heat recovery heat exchanger (5) and reaches a overheat state and then enters the first compressor (3).
3. The marine LNG engine air supply system of claim 2, wherein: the marine LNG engine air supply system also comprises a gas-liquid separator (7), an ejector (8), a first one-way valve (101), a second one-way valve (102) and a third one-way valve (103); the outlet of the booster pump (9) and one end of the gasifier (2) form a unidirectional fluid communication structure through the first one-way valve (101); the outlet of the booster pump (9) and the inlet of the second flow channel of the heat recovery heat exchanger (5) form a one-way fluid communication structure through the second one-way valve (102); the gas-liquid separator (7) comprises an inlet (71), a liquid outlet (72) and an air outlet (73), a sprayer (11) is arranged in the storage tank (1), the ejector (8) comprises an ejection inlet (81), an ejection outlet (82) and an ejection port (83), the throttle valve outlet (62) is in fluid communication with the inlet (71), the liquid outlet (72) and sprayer fluid form a one-way fluid communication structure through the third one-way valve (103), and the air outlet (73) is in fluid communication with the ejection port (83).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310055876.5A CN116146384A (en) | 2023-01-18 | 2023-01-18 | Marine LNG engine air feed system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310055876.5A CN116146384A (en) | 2023-01-18 | 2023-01-18 | Marine LNG engine air feed system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116146384A true CN116146384A (en) | 2023-05-23 |
Family
ID=86350287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310055876.5A Pending CN116146384A (en) | 2023-01-18 | 2023-01-18 | Marine LNG engine air feed system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116146384A (en) |
-
2023
- 2023-01-18 CN CN202310055876.5A patent/CN116146384A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10704739B2 (en) | Natural gas temperature and pressure regulating system based on recovering pressure energy and absorbing heat from ultralow temperature ambient environment | |
| KR101350807B1 (en) | Hybrid fuel supply system for ship engine | |
| JP5429719B2 (en) | Gas supply system for gas engine | |
| CN109595468B (en) | Cold helium supercharging and cooling conveying system of low-temperature carrier rocket | |
| CN103097237A (en) | Boil-off gas reliquefaction device | |
| CN110905693B (en) | High-pressure gas supply system capable of efficiently utilizing cold energy of LNG (liquefied natural gas) fuel | |
| CN104265512A (en) | High-pressure/low-pressure gas supply system of ship power plant | |
| CN103010447A (en) | Fuel gas supply system and method of ship | |
| CN112254561B (en) | Liquid air energy storage system utilizing LNG cold energy and fuel gas peak shaving power generation waste heat | |
| CN110748439B (en) | Low-pressure gas supply system capable of efficiently utilizing cold energy of LNG (liquefied natural gas) fuel | |
| CN111928109A (en) | Boil-off gas recovery system of hydrogenation station | |
| CN109681776B (en) | BOG reliquefaction and LNG regasification integrated system and working method | |
| WO2013032340A1 (en) | System and method for boosting bog in a lng fuel system | |
| KR20100061368A (en) | A fuel gas supply system and ship with the same | |
| KR102044266B1 (en) | Fuel Supply System And Method For Ship Engines | |
| US20230160330A1 (en) | Liquid ammonia phase-change cooling type hybrid power thermal management system | |
| CN103954091A (en) | Refrigeratory refrigeration system capable of fully utilizing cold energy of liquefied natural gas | |
| US10030610B2 (en) | Fuel system for an engine | |
| CN110159920A (en) | LNG air supply system peculiar to vessel | |
| CN116146384A (en) | Marine LNG engine air feed system | |
| CN116950809A (en) | LNG power ship fuel gas recovery system, control method thereof and ship | |
| KR101350808B1 (en) | Hybrid fuel supply system and method for ship engines | |
| CN110094932A (en) | The condenser system again and method of the boil-off gas of liquefied natural gas | |
| CN212298527U (en) | Boil-off gas recovery system of hydrogenation station | |
| CN210179314U (en) | Marine LNG gas supply system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |