CN115614188A - Marine liquid ammonia fuel supply system and fuel recovery system and method thereof - Google Patents
Marine liquid ammonia fuel supply system and fuel recovery system and method thereof Download PDFInfo
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- CN115614188A CN115614188A CN202211345242.5A CN202211345242A CN115614188A CN 115614188 A CN115614188 A CN 115614188A CN 202211345242 A CN202211345242 A CN 202211345242A CN 115614188 A CN115614188 A CN 115614188A
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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
- F02M21/0206—Non-hydrocarbon fuels, e.g. hydrogen, ammonia or carbon monoxide
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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
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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
- F02M21/0221—Fuel storage reservoirs, e.g. cryogenic tanks
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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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- General Chemical & Material Sciences (AREA)
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention provides a marine liquid ammonia fuel supply system and a fuel recovery system and method thereof, wherein the liquid ammonia fuel supply system comprises: a storage tank, a fuel recovery system and a host; the fuel recovery system includes: a recycle tank, a first supply line, a second supply line, and a recovery line. The storage tank is connected with the circulating tank through a first supply pipeline, and the circulating tank is connected with the main machine through a second supply pipeline to form a fuel supply part for supplying fuel meeting conditions from the storage tank to the main machine; the main machine and the circulating tank are connected through a recovery pipeline to form a fuel recovery part for recovering and reusing return fuel discharged by the main machine. Meanwhile, a method for supplying and recovering liquid ammonia fuel for a ship is provided. The invention solves the problems of fuel supply and fuel recovery of the ammonia fuel ship, meets the requirements of supply pressure and temperature of the ammonia fuel main engine, recycles the liquid ammonia refluxed by the main engine and reduces the emission of ammonia.
Description
Technical Field
The invention relates to the technical field of marine fuel supply, in particular to a marine liquid ammonia fuel supply system for a ship by taking liquid ammonia as fuel, and a fuel recovery system and method thereof.
Background
According to the international maritime organization, compared with 2008, the greenhouse gas of the ship is reduced by 40% by 2030 and reduced by half by 2050. The molecular structure of the ammonia is carbon-free and sulfur-free, and the ammonia can be used as fuel for combustion, has no carbon emission and sulfur emission, and is not difficult to store and treat. Ammonia is attracting attention as a marine fuel. In contrast, various large ship engine manufacturers have made continuous decisions to develop ammonia-fueled engines. The mann project introduced an ammonia fuel host for ships in 2024, which host required the supply of liquid ammonia at a pressure of 80barg and a temperature of 25-45 ℃. This requires the configuration of a liquid ammonia fuel supply and fuel recovery system for handling liquid ammonia in tanks onboard the vessel, providing fuel at appropriate pressure, temperature and flow rate to the host, and recovering liquid ammonia fuel returned from the host.
The existing liquid ammonia fuel supply system adopts a mode that liquid ammonia is heated after two-stage pressurization, lacks the recovery treatment of liquid ammonia for host machine backflow and purging, and cannot reduce the emission of ammonia. The high-pressure pump and the low-pressure pump are connected in series, the two stages of pumps need to meet the use condition of liquid ammonia at-33 ℃, and the equipment cost is higher.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a marine liquid ammonia fuel supply system and a fuel recovery system and method thereof.
According to one aspect of the present invention, there is provided a fuel recovery system for a marine liquid ammonia fuel supply system, comprising: the recycling tank, the first supply pipeline, the second supply pipeline and the recycling pipeline; wherein:
the circulating tank is connected with the storage tank through the first supply pipeline, and the circulating tank is connected with the main engine through the second supply pipeline to form a fuel supply part for supplying fuel meeting conditions from the storage tank to the main engine;
the circulating tank is connected with the main machine through the recovery pipeline to form a fuel recovery part for recovering the return fuel discharged by the main machine for reutilization.
Optionally, the first supply line comprises: a low pressure pump and a first supply line; wherein: the low-pressure pump is disposed inside a storage tank and connected to the circulation tank through the first supply line.
Optionally, the second supply line comprises: a heat exchanger, a high pressure pump, a filter, and a second supply line; wherein: the bottom end of the circulating tank is sequentially connected with the heat exchanger, the high-pressure pump and the filter to a host machine through the second supply pipeline.
Optionally, the low-pressure pump is configured to pressurize the liquid ammonia in the storage tank to generate low-pressure liquid ammonia.
Optionally, the circulation tank is used for storing the low-pressure liquid ammonia output by the storage tank and/or the return fuel output by the host machine, and outputting the fuel to be supplied.
Optionally, the heat exchanger is used for heating or cooling the fuel to be supplied output by the circulation tank, and outputting the fuel meeting the temperature requirement of a host machine.
Optionally, the high-pressure pump is used for further pressurizing the fuel output by the heat exchanger, and outputting the fuel meeting the pressure requirement of the main engine.
Optionally, a filter is used for filtering the fuel output by the high-pressure pump, and finally outputting the fuel meeting the condition.
Optionally, the recovery line comprises two paths, wherein: the first path is used for outputting the return fuel to the circulating tank when the main engine runs; and the second path is used for outputting the return fuel to the circulating tank when the main engine is stopped.
Optionally, the main machine and the recovery pipeline are purged by nitrogen in a shutdown state of the main machine, and the return fuel is a mixture of ammonia and nitrogen.
Optionally, a fuel return valve is disposed on the first path of the recovery pipeline.
Optionally, a purge reflux valve is arranged on the second path of the recovery pipeline.
Optionally, a nitrogen supply valve and a discharge regulating valve are arranged on the circulation tank; wherein:
the nitrogen supply valve is used for controlling nitrogen input into the circulating tank for in-tank pressurization;
and the discharge regulating valve is used for outputting redundant nitrogen in the circulating tank.
Optionally, the excess nitrogen comprises: nitrogen mixed in the return fuel and generated after gas-liquid separation in the circulation tank, and/or nitrogen input into the circulation tank for in-tank pressurization;
optionally, a circulation tank pressure sensor is further arranged on the circulation tank, and is used for monitoring the pressure in the circulation tank in real time.
According to another aspect of the present invention, there is provided a fuel recovery method for a marine liquid ammonia fuel supply system, comprising: a fuel supply section and a fuel recovery section; wherein:
the fuel supply portion includes:
obtaining initial liquid ammonia from a fuel storage tank and pre-storing the initial liquid ammonia;
supplying the pre-stored initial liquid ammonia and/or reusable return fuel as fuel to be supplied, generating fuel capable of meeting conditions, outputting the fuel to the host, and finishing fuel supply from the fuel storage tank to the host;
the fuel recovery section includes:
and acquiring and pre-storing the return fuel of the main machine to form reusable return fuel, and completing the fuel recovery from the main machine to the fuel storage tank.
Optionally, the provisioning process comprises:
and sequentially carrying out heat exchange treatment, pressurization treatment and filtration treatment on the fuel to be supplied to obtain the supplied fuel capable of meeting the temperature and pressure requirements of the host.
Optionally, the obtaining and pre-storing returned fuel of the host to form reusable returned fuel includes:
the backflow fuel comprises two paths, wherein one path is a first path of backflow fuel generated when the host machine operates, and the first path of backflow fuel is ammonia gas; the other path is a second path of return fuel generated when the host machine is shut down, and the second path of return fuel is a mixed gas of ammonia and nitrogen;
in the pre-storing process:
by controlling the storage pressure, the first path of return fuel is directly converted into liquid ammonia as reusable return fuel;
and (3) converting ammonia gas in the second path of return fuel into liquid ammonia by controlling the storage pressure, carrying out gas-liquid separation at the moment, discharging nitrogen gas, and taking the separated liquid ammonia as reusable return fuel.
Optionally, the controlling the storage pressure comprises:
when the storage pressure is less than or equal to a set threshold value, filling nitrogen into a storage environment to increase the storage pressure;
when the storage pressure is greater than a set threshold, nitrogen is vented from the storage environment such that the storage pressure is reduced.
According to a third aspect of the present invention, there is provided a marine liquid ammonia fuel supply system comprising: a storage tank, a host, and a fuel recovery system as described in any of the above; wherein:
the storage tank and the circulating tank are connected through a first supply pipeline, and the circulating tank and the host machine are connected through a second supply pipeline to form a fuel supply part for supplying fuel meeting conditions from the storage tank to the host machine;
the main machine and the circulating tank are connected through a recovery pipeline to form a fuel recovery part, and the fuel recovery part is used for recovering return fuel discharged by the main machine for reutilization.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:
according to the marine liquid ammonia fuel supply system and the fuel recovery system and method thereof, the arrangement of the circulating tank ensures the generation of ammonia gas of the whole supply and recovery system, and recovers liquid ammonia which is normally refluxed and stopped to be purged, thereby reducing the emission of ammonia under normal operation conditions and supplying liquid ammonia with stable pressure and temperature for the ammonia fuel host.
According to the marine liquid ammonia fuel supply system and the fuel recovery system and method thereof, the heat exchanger is arranged between the circulating tank and the high-pressure pump, low-temperature low-pressure liquid ammonia is heated by the heat exchanger and then enters the high-pressure pump at normal temperature, so that the high-pressure pump does not need to bear low temperature, and the equipment cost is reduced.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic structural diagram of a marine liquid ammonia fuel supply system and a fuel recovery system thereof according to a preferred embodiment of the present invention.
In the figure: 1 is the storage tank, 2 is the low-pressure pump, 3 is the accumulator, 4 is the heat exchanger, 5 is the high-pressure pump, 6 is the filter, 7 is the host computer, 8 is the nitrogen gas supply valve, 9 is the relief valve, 10 is the fuel return valve, 11 is the purge return valve, 12 is the accumulator pressure sensor.
Detailed Description
The following examples illustrate the invention in detail: the embodiment is implemented on the premise of the technical scheme of the invention, and a detailed implementation mode and a specific operation process are given. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention.
An embodiment of the present invention provides a marine liquid ammonia fuel supply and fuel recovery system configured for a ship using liquid ammonia as a fuel, which is capable of supplying the ship with fuel under appropriate conditions and recovering fuel returned from a main engine.
As shown in fig. 1, the fuel recovery system for a marine liquid ammonia fuel supply system according to this embodiment may include: a circulation tank 3, a first supply line, a second supply line, and a recovery line; wherein:
the circulation tank 3 is connected with the storage tank 1 through a first supply pipeline, and the circulation tank 3 is connected with the main engine 7 through a second supply pipeline to form a fuel supply part for supplying fuel meeting conditions from the storage tank 1 to the main engine 7;
the circulation tank 3 is connected to the main unit 7 through a recovery pipe, and constitutes a fuel recovery section for recovering and reusing the returned fuel discharged from the main unit 7.
In a preferred embodiment, the first supply line comprises: a low pressure pump 2 and a first supply line; wherein: the low-pressure pump 2 is disposed inside the storage tank 1, and is connected to the circulation tank 3 through a first supply line.
In a preferred embodiment, the second supply line comprises: a heat exchanger 4, a high-pressure pump 5, a filter 6 and a second supply line; wherein: the bottom end of the circulation tank 3 is connected in sequence to a heat exchanger 4, a high-pressure pump 5 and a filter 6 to a main machine 7 through a second supply line.
In a preferred embodiment, the low pressure pump 2 is used to pressurize the liquid ammonia in the tank 1, generating low pressure liquid ammonia.
In a preferred embodiment, the recycle tank 3 is used to store the low-pressure liquid ammonia output from the storage tank 1 and/or the return fuel output from the main unit 7, and to output the fuel to be supplied.
In a preferred embodiment, the heat exchanger 4 is used for heating or cooling the fuel to be supplied output from the circulation tank 3, and outputting the fuel meeting the temperature requirement of the host 7.
In a preferred embodiment, the high pressure pump 5 is used to further pressurize the fuel output from the heat exchanger 4, outputting fuel meeting the pressure requirements of the main engine 7.
In a preferred embodiment, the filter 6 is used for filtering the fuel output by the high-pressure pump 5, and finally outputting the fuel meeting the condition.
In a preferred embodiment, the recovery circuit comprises two paths, wherein: the first path is used for outputting return fuel to the circulating tank 3 when the main engine 7 operates; the second path is used for outputting return fuel to the circulating tank 3 when the main machine 7 is stopped.
In a preferred embodiment, the main unit 7 and the recovery line are purged with nitrogen during the shutdown of the main unit 7, and the return fuel is a mixture of ammonia and nitrogen.
In a preferred embodiment, a fuel return valve 10 is provided in the first branch of the return line.
In a preferred embodiment, a purge reflux valve 11 is provided in the second path of the recovery line.
In a preferred embodiment, the circulation tank 3 is provided with a nitrogen supply valve 8 and a bleed regulating valve 9; wherein:
the nitrogen supply valve 8 is used for controlling nitrogen input into the circulating tank 3 for performing in-tank pressurization;
the bleed-off regulating valve 9 is used to output excess nitrogen gas in the circulation tank 3.
In a preferred embodiment, the excess nitrogen comprises: nitrogen gas generated after gas-liquid separation in the circulation tank 3 and mixed in the return fuel, and/or nitrogen gas for performing in-tank pressurization by being input to the circulation tank 3.
In a preferred embodiment, a circulation tank pressure sensor 12 is also provided on the circulation tank 3 for monitoring the pressure in the circulation tank 3 in real time.
An embodiment of the present invention provides a fuel recovery method for a marine liquid ammonia fuel supply system, which may include: a fuel supply section and a fuel recovery section; wherein:
a fuel supply section comprising:
obtaining initial liquid ammonia from a fuel storage tank and pre-storing the initial liquid ammonia;
pre-stored initial liquid ammonia and/or reusable backflow fuel are used as fuel to be supplied for supplying treatment, fuel capable of meeting conditions is generated and output to the host, and fuel supply from the fuel storage tank to the host is completed;
a fuel recovery section comprising:
and acquiring and pre-storing the return fuel of the host to form reusable return fuel, and finishing fuel recovery from the host to the fuel storage tank.
In a preferred embodiment, the provisioning process includes:
and sequentially carrying out heat exchange treatment, pressurization treatment and filtration treatment on the fuel to be supplied to obtain the supplied fuel capable of meeting the temperature and pressure requirements of the host.
In a preferred embodiment, obtaining the return fuel of the main engine and pre-storing the return fuel to form reusable return fuel includes:
the return fuel comprises two paths, wherein one path is a first path of return fuel generated when the host machine operates, and the first path of return fuel is ammonia gas; the other path is a second path of return fuel generated when the host machine is shut down, and the second path of return fuel is a mixed gas of ammonia and nitrogen;
in the pre-storing process:
by controlling the storage pressure, the first path of return fuel is directly converted into liquid ammonia as reusable return fuel;
and (3) converting ammonia gas in the second path of return fuel into liquid ammonia by controlling the storage pressure, carrying out gas-liquid separation at the moment, discharging nitrogen gas, and taking the separated liquid ammonia as reusable return fuel.
In a preferred embodiment, controlling the storage pressure comprises:
when the storage pressure is less than or equal to a set threshold value, filling nitrogen into the storage environment to increase the storage pressure;
when the storage pressure is greater than a set threshold, nitrogen is vented from the storage environment, causing the storage pressure to decrease.
It should be noted that, the steps in the method provided by the present invention can be implemented by using corresponding devices in the system, and those skilled in the art can implement the step flow of the method by referring to the technical solution of the system, that is, the embodiment in the system can be understood as a preferred example of implementing the method, and will not be described herein again.
The technical solutions provided by the above embodiments of the present invention are further described in detail below with reference to a preferred embodiment.
As shown in fig. 1, the preferred embodiment provides a fuel supply and fuel recovery system for liquid ammonia for ships, wherein the fuel supply section is low-pressure liquid ammonia pressurized to a certain pressure by a low-pressure pump, and the low-pressure liquid ammonia flows into a circulation tank. And the liquid ammonia is heated or cooled by the heat exchanger from the bottom of the circulating tank, and then is further pressurized by the high-pressure pump, and the high-pressure liquid ammonia is subjected to impurity removal by the filter and is supplied to the host. The fuel recovery part recovers the fuel returned by the main machine to the circulating tank, and excessive nitrogen is discharged to ventilate.
Further, the specific construction and working flow of the fuel supply part are as follows:
the low-pressure pump 2 is installed inside the tank 1. Liquid ammonia in the storage tank 1 is pressurized into low-pressure liquid ammonia by the low-pressure pump 2 and injected into the circulation tank 3. And the low-pressure liquid ammonia is discharged from the bottom of the circulating tank 3 and is heated by the heat exchanger 4, so that the temperature of the low-pressure liquid ammonia meets the requirement of the host 7. After the low-pressure liquid ammonia is heated, the pressure is further increased through a high-pressure pump 5, so that the pressure of the liquid ammonia meets the requirement of a host 7. The high-pressure liquid ammonia is filtered by a filter 6 and finally enters a host 7 to be used as fuel 1.
Further, the specific construction and working flow of the fuel recovery part are as follows:
the returned fuel is exhausted from the main unit 7, which causes the temperature of the returned fuel to increase due to cooling of the injectors in the main unit. The fuel return valve 10 is opened and the returned fuel passes through the fuel return valve 10 and is again injected into the circulation tank 3. When the main engine is shut down, nitrogen is required to purge the main engine and the pipelines, and at the moment, the fuel return valve 10 is closed, and the purge return valve 11 and the discharge regulating valve 9 are opened. The liquid ammonia which is blown back is recycled to the circulating tank 3 through the blowing back valve 11, and the redundant nitrogen is subjected to liquid separation in the circulating tank 3 and then is ventilated through the discharge regulating valve 9.
In some embodiments of the invention:
the circulation tank 3 can satisfy the following functions:
1. and mixing the low-pressure liquid ammonia at the outlet of the low-pressure pump 2 and the liquid ammonia refluxed by the main machine.
2. The sealing oil can be carried by the liquid ammonia of backward flow, and the setting of recycle tank 3 can prevent that the storage tank 1 is polluted to the sealing oil.
3. The temperature of the returned fuel is raised to a certain temperature, and the working pressure of the circulation tank 3 is controlled to be higher than the saturation pressure of the corresponding liquid ammonia at the certain temperature, so that the returned fuel is ensured to be in a liquid state in the circulation tank 3.
4. When the nitrogen gas purges the liquid in the main unit 7 and a part of the pipeline, the circulating tank 3 can store the part of the liquid and recycle the part of the liquid when the main unit 7 operates.
5. When the main unit 7 is purged, the discharged mixture of nitrogen and ammonia gas may be subjected to liquid separation. The discharged gas has a sufficient residence time in the gas phase space in the circulation tank 3 to separate liquid ammonia droplets.
Nitrogen may flow into the recycle tank 3 through a nitrogen supply valve 8. The circulation tank 3 is provided with a circulation tank pressure sensor 12 for monitoring the pressure in the circulation tank 3. When the pressure in the circulation tank 3 is reduced, the nitrogen supply valve 8 is opened, and the circulation tank 3 is pressurized by nitrogen; when the pressure in the circulation tank 3 rises, the release regulating valve 9 is opened, and the circulation tank 3 is depressurized through ventilation.
The heat exchanger 4 may also be adapted to heat or cool the mixed liquid ammonia. When the host 1 is in high load, the flow of liquid ammonia at the outlet of the low-pressure pump 2 is large, the flow of backflow is small, the temperature of mixed liquid ammonia is low, and the heater heats the mixed liquid ammonia. When the host machine 1 is in low load, the flow of liquid ammonia at the outlet of the low-pressure pump 2 is small, the flow of backflow is large, the temperature of mixed liquid ammonia is high, and the heater cools the mixed liquid ammonia at the moment.
The fuel supply part is provided with a low-pressure pump 2 arranged in a storage tank 1, and the low-pressure pump 2, a circulating tank 3, a heat exchanger 4, a high-pressure pump 5, a filter 6 and a main machine 7 are sequentially connected through a supply pipeline.
The fuel recovery part is connected to the circulation tank 3 through a return pipeline (recovery pipeline) in the main machine 7, the return pipeline is divided into two paths, one path is connected with the fuel return valve 10 and then goes to the circulation tank 3, and the other path is connected with the purging return valve 11 and then goes to the circulation tank 3.
A heat exchanger 4 is arranged between the circulation tank 3 and the high-pressure pump 5.
When the nitrogen gas purges the liquid in the main unit 7 and a part of the pipeline, the circulating tank 3 can store the part of the liquid and recycle the part of the liquid when the main unit 7 operates. The recycle tank 3 can also separate discharged nitrogen and ammonia gas mixture.
The nitrogen gas is connected to the circulation tank 3 through a nitrogen gas supply valve 8. The gas with overpressure is discharged from the top of the circulation tank 3 and is connected to a relief regulating valve 9 for venting. The circulation tank 3 is opened and a circulation tank pressure sensor 12 is provided to monitor the pressure of the circulation tank 3. When the pressure in the circulation tank 1 is reduced, the nitrogen supply valve 8 is opened, and the circulation tank 1 is pressurized by nitrogen; when the pressure in the circulation tank 1 rises, the discharge regulating valve 9 is opened, and the circulation tank 1 is depressurized through ventilation.
An embodiment of the invention provides a marine liquid ammonia fuel supply system.
As shown in fig. 1, the marine liquid ammonia fuel supply system provided by this embodiment may include: the storage tank 1, the host 7 and the fuel recovery system of any of the above embodiments of the present invention; wherein:
the storage tank 1 is connected with the circulating tank 3 through a first supply pipeline, and the circulating tank 3 is connected with the main machine 7 through a second supply pipeline to form a fuel supply part for supplying fuel meeting conditions from the storage tank 1 to the main machine 7;
the main unit 7 and the circulation tank 3 are connected by a recovery pipe to constitute a fuel recovery section for recovering and reusing the return fuel discharged from the main unit 7.
According to the marine liquid ammonia fuel supply and fuel recovery system and the method thereof provided by the embodiment of the invention, the arrangement of the circulating tank ensures the generation of ammonia gas of the whole supply and recovery system, and recovers liquid ammonia which is normally refluxed and stopped to be purged, reduces the emission of ammonia under normal operation conditions, and supplies liquid ammonia with stable pressure and temperature for the ammonia fuel host; the heat exchanger is arranged between the circulating tank and the high-pressure pump, and the low-temperature low-pressure liquid ammonia is heated by the heat exchanger and then enters the high-pressure pump at normal temperature, so that the high-pressure pump does not need to bear low temperature, and the equipment cost is reduced.
The above embodiments of the present invention are not exhaustive and are all known in the art.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (12)
1. A fuel recovery system for a marine liquid ammonia fuel supply system, comprising: a circulation tank (3), a first supply pipeline, a second supply pipeline and a recovery pipeline; wherein:
the circulation tank (3) is connected with the storage tank (1) through the first supply pipeline, the circulation tank (3) is connected with the main engine (7) through the second supply pipeline to form a fuel supply part, and the fuel supply part is used for supplying fuel meeting conditions from the storage tank (1) to the main engine (7);
the circulating tank (3) is connected with the main machine (7) through the recovery pipeline to form a fuel recovery part for recovering the return fuel discharged by the main machine (7) for reuse.
2. The fuel recovery system for a marine liquid ammonia fuel supply system of claim 1, wherein said first supply line comprises: a low pressure pump (2) and a first supply line; wherein: the low-pressure pump (2) is arranged inside the storage tank (1) and is connected to the circulation tank (3) by the first supply line; and/or
The second supply line comprising: a heat exchanger (4), a high pressure pump (5), a filter (6) and a second supply line; wherein: the bottom end of the circulating tank (3) is sequentially connected with the heat exchanger (4), the high-pressure pump (5) and the filter (6) to a host (7) through the second supply pipeline.
3. A fuel recovery system for a marine liquid ammonia fuel supply system according to claim 2, further comprising any one or more of:
-the low-pressure pump (2) is adapted to pressurize liquid ammonia in the tank (1) generating low-pressure liquid ammonia;
-said circulation tank (3) is used to store the liquid ammonia at low pressure output by the storage tank (1) and/or the return fuel output by the main machine (7), and to output the fuel to be supplied;
-the heat exchanger (4) is used for heating or cooling the fuel to be supplied output by the circulation tank (3), and outputting the fuel meeting the temperature requirement of a host machine (7);
-the high pressure pump (5) is used for further pressurizing the fuel output by the heat exchanger (4) and outputting the fuel meeting the pressure requirement of a main engine (7);
-a filter (6) for filtering the fuel delivered by the high-pressure pump (5) and eventually delivering the fuel satisfying the condition.
4. The fuel recovery system for a marine liquid ammonia fuel supply system of claim 1, wherein said recovery circuit comprises two paths, wherein: the first path is used for outputting the return fuel to the circulating tank (3) when a main machine (7) operates; the second path is used for outputting the return fuel to the circulating tank (3) when the main machine (7) is shut down.
5. A fuel recovery system for a marine liquid ammonia fuel supply system according to claim 4, wherein said recovery circuit further comprises any one or more of:
-purging the main unit (7) and the recovery line with nitrogen in the shutdown condition of the main unit (7), the return fuel being a mixture of ammonia and nitrogen;
-a fuel return valve (10) is provided on a first branch of the recovery line;
-a purge return valve (11) is provided on the second path of the recovery line.
6. A fuel recovery system for a marine liquid ammonia fuel supply system according to claim 1, characterized in that said circulation tank (3) is provided with a nitrogen supply valve (8) and a bleed regulating valve (9); wherein:
the nitrogen supply valve (8) is used for controlling nitrogen input into the circulating tank (3) for tank pressurization;
and the discharge regulating valve (9) is used for outputting redundant nitrogen in the circulating tank (3).
7. Fuel recovery system for a marine liquid ammonia fuel supply system according to claim 6, characterized in that said recycle tank (3) further comprises any one or any more of:
-said excess nitrogen comprising: nitrogen mixed in the return fuel and generated after gas-liquid separation in the circulation tank (3), and/or nitrogen input into the circulation tank (3) for in-tank pressurization;
-a circulation tank pressure sensor (12) is further arranged on the circulation tank (3) for monitoring the pressure in the circulation tank (3) in real time.
8. A fuel recovery method for a marine liquid ammonia fuel supply system, comprising: a fuel supply section and a fuel recovery section; wherein:
the fuel supply portion includes:
obtaining initial liquid ammonia from a fuel storage tank and pre-storing the initial liquid ammonia;
supplying the pre-stored initial liquid ammonia and/or reusable return fuel as fuel to be supplied, generating fuel capable of meeting conditions, outputting the fuel to the host, and finishing fuel supply from the fuel storage tank to the host;
the fuel recovery section includes:
and acquiring and pre-storing the return fuel of the host to form reusable return fuel, and finishing fuel recovery from the host to the fuel storage tank.
9. The fuel recovery method for a marine liquid ammonia fuel supply system according to claim 8, wherein said supply process comprises:
and sequentially carrying out heat exchange treatment, pressurization treatment and filtration treatment on the fuel to be supplied to obtain the supplied fuel capable of meeting the temperature and pressure requirements of the host.
10. The fuel recovery method for a marine liquid ammonia fuel supply system according to claim 8, wherein said obtaining and pre-storing return fuel of said main unit to form reusable return fuel comprises:
the backflow fuel comprises two paths, wherein one path is a first path of backflow fuel generated when the host machine operates, and the first path of backflow fuel is ammonia gas; the other path is a second path of return fuel generated when the host machine is shut down, and the second path of return fuel is a mixed gas of ammonia and nitrogen;
in the pre-storing process:
by controlling the storage pressure, the first path of return fuel is directly converted into liquid ammonia as reusable return fuel;
and (3) converting ammonia gas in the second path of return fuel into liquid ammonia by controlling the storage pressure, carrying out gas-liquid separation at the moment, discharging nitrogen gas, and taking the separated liquid ammonia as reusable return fuel.
11. The fuel recovery method for a marine liquid ammonia fuel supply system of claim 10, wherein said controlling the storage pressure comprises:
when the storage pressure is less than or equal to a set threshold value, filling nitrogen into a storage environment to increase the storage pressure;
when the storage pressure is greater than a set threshold, nitrogen is vented from the storage environment such that the storage pressure is reduced.
12. A marine liquid ammonia fuel supply system, comprising: a storage tank (1), a host (7) and a fuel recovery system according to any one of claims 1-7; wherein:
the storage tank (1) and the circulation tank (3) are connected through the first supply pipeline, and the circulation tank (3) and the main machine (7) are connected through the second supply pipeline to form a fuel supply part for supplying fuel meeting conditions from the storage tank (1) to the main machine (7);
the main engine (7) and the circulating tank (3) are connected through the recovery pipeline to form a fuel recovery part, and the fuel recovery part is used for recovering the return fuel discharged by the main engine (7) for reuse.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4269779A1 (en) * | 2020-12-28 | 2023-11-01 | Dalian Shipbuilding Industry Co. Ltd | Marine liquid ammonia fuel supply and fuel recycling system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4269779A1 (en) * | 2020-12-28 | 2023-11-01 | Dalian Shipbuilding Industry Co. Ltd | Marine liquid ammonia fuel supply and fuel recycling system |
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