CN220829003U - Ammonia reliquefaction system - Google Patents
Ammonia reliquefaction system Download PDFInfo
- Publication number
- CN220829003U CN220829003U CN202322339717.6U CN202322339717U CN220829003U CN 220829003 U CN220829003 U CN 220829003U CN 202322339717 U CN202322339717 U CN 202322339717U CN 220829003 U CN220829003 U CN 220829003U
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- Prior art keywords
- ammonia
- storage tank
- liquid
- liquid ammonia
- cooler
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 438
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 154
- 238000000034 method Methods 0.000 abstract description 19
- 238000001816 cooling Methods 0.000 abstract description 11
- 230000006835 compression Effects 0.000 abstract description 7
- 238000007906 compression Methods 0.000 abstract description 7
- 239000000446 fuel Substances 0.000 description 19
- 239000002826 coolant Substances 0.000 description 4
- 230000006837 decompression Effects 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 238000004064 recycling Methods 0.000 description 3
- 239000013535 sea water Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The utility model discloses an ammonia reliquefaction system which comprises a liquid ammonia storage tank, an ammonia compressor and an ammonia cooler which are sequentially connected, wherein the ammonia cooler is connected with the liquid ammonia storage tank through a throttle expansion valve; wherein: ammonia in the liquid ammonia storage tank is introduced into the ammonia compressor, and the ammonia is pressurized by the ammonia compressor; the pressurized ammonia in the ammonia compressor is introduced into the ammonia cooler and is cooled to liquid ammonia through the ammonia cooler; and the liquid ammonia in the ammonia cooler is returned to the liquid ammonia storage tank through a throttle expansion valve. According to the utility model, through the technological processes of compression, cooling, throttling expansion and the like of the ammonia in the liquid ammonia storage tank, the liquefaction of the ammonia is realized, and the safety problem caused by pressure rise in the low-temperature storage process of the liquid ammonia is solved.
Description
Technical Field
The utility model relates to the technical field of ammonia fuel supply systems, in particular to an ammonia reliquefaction system.
Background
In the global dual carbon emission reduction target context, ammonia fuel is becoming a very potential alternative fuel for engines, particularly in the marine industry, as a zero carbon fuel. Currently, in order to reduce the occupied volume of fuel, ammonia fuel for a ship is stored in a low-temperature liquid state, and during the low-temperature storage process of liquid ammonia, the ammonia fuel can be introduced due to external heat, so that the pressure of an ammonia fuel storage tank is increased, and the storage safety problem is caused.
CN111392019a discloses a ship power system with clean emission, which comprises an ammonia liquefaction system, the system comprises a liquid ammonia fuel storage tank, an ammonia pre-cooler and an ammonia liquefaction device, but the heat exchange of the ammonia pre-cooler needs to be adapted to an ammonia fuel supply system to operate, the equipment is complex, and the ammonia liquefaction device does not give a specific implementation mode. CN115487650a discloses an ammonia gas vent recovery method of a marine ammonia gas vent recovery system, comprising: the mixed gas with ammonia flows to an ammonia liquefying tank for storage; pressurizing the ammonia liquefying tank through a nitrogen purging pipe, converting part of ammonia gas into liquid ammonia for recycling, and discharging other unconverted ammonia gas; the system has low liquefaction efficiency and high ammonia waste rate. CN115675812a discloses a marine fuel supply system and an ammonia BOG recycling system and method thereof, but the system also needs to be additionally provided with a pressurizing device to liquefy the ammonia BOG in the gas-liquid separation tank again, so as to realize improvement of ammonia BOG recycling efficiency.
In summary, the existing ammonia reliquefaction system is complex and has high system operation cost.
Disclosure of utility model
The utility model aims to provide an ammonia reliquefaction system and method, which can safely, environmentally-friendly, energy-saving and reliably solve the technical problem of pressure rise in the process of storing liquid ammonia at low temperature. The system is suitable for occasions such as ammonia fuel power ships, ammonia fuel transport ships, ammonia fuel power stations and the like which are equipped with ammonia fuel engines.
The utility model provides an ammonia reliquefaction system which comprises a liquid ammonia storage tank, an ammonia compressor and an ammonia cooler which are sequentially connected, wherein the ammonia cooler is connected with the liquid ammonia storage tank through a throttle expansion valve; wherein:
the liquid ammonia storage tank is used for storing ammonia fuel;
the ammonia compressor is used for pressurizing the ammonia output from the liquid ammonia storage tank to obtain high-temperature high-pressure ammonia;
the ammonia cooler is used for cooling high-temperature high-pressure ammonia gas to obtain liquid ammonia;
The throttling expansion valve is used for decompressing the liquid ammonia output by the ammonia cooler to obtain low-pressure liquid ammonia and steam;
the liquid ammonia storage tank recovers low-pressure liquid ammonia and steam, and the reliquefaction of ammonia gas is realized.
In a preferred embodiment, an ammonia reliquefaction system further comprises an ammonia heater disposed between the liquid ammonia storage tank and the ammonia compressor; the ammonia heater is used for heating the ammonia output by the liquid ammonia storage tank to the air inlet temperature range required by the ammonia compressor.
In a preferred embodiment, the marine ammonia fuel reliquefaction system further comprises a liquid ammonia collection storage tank arranged between the ammonia cooler and the throttle expansion valve; the liquid ammonia collecting storage tank is used for storing cooled liquid ammonia.
In a preferred embodiment, the cooling medium of the ammonia cooler is normal temperature seawater or other cooling medium, and the temperature of the medium is lower than 40 ℃.
In a preferred embodiment, the system adopts a multi-stage pressurizing and cooling mode, and a multi-stage ammonia gas compressor and a plurality of coolers are arranged between the liquid ammonia storage tank and the throttling expansion valve.
In a preferred embodiment, the output pressure of the high temperature and high pressure ammonia gas is 1.0-1.6MPaG; the normal working temperature of the liquid ammonia storage tank is lower than 0 ℃, and the normal working pressure is lower than 0.5MPaG.
The utility model has the beneficial effects that:
According to the utility model, the ammonia in the liquid ammonia storage tank is subjected to the technological processes of compression, cooling, throttling expansion and the like, so that the liquefaction of the ammonia is realized, the whole system has a good re-liquefaction effect, the technological process is simple, the operation is easy, the equipment investment is less, and the safety problem caused by pressure rise in the low-temperature storage process of the liquid ammonia is solved. The utility model adopts normal temperature cooling medium, and reduces the complexity of ammonia liquefying process and the running cost of the system. In some embodiments of the utility model, the output pressure of the high-temperature high-pressure ammonia gas is 1.0-1.6MPaG, so that the design pressure of the ammonia gas compressor can be reduced, and the cost of the ammonia gas compressor can be saved.
Drawings
FIG. 1 is a schematic diagram of an ammonia reliquefaction system according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram showing the structure of an ammonia reliquefaction system according to another embodiment of the present utility model;
Legend description:
1-a liquid ammonia storage tank; 2-ammonia gas compressor; 3-ammonia cooler; 4-throttling expansion valve; a 5-ammonia heater; 6-liquid ammonia collecting storage tank.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the embodiments of the present utility model will be described in further detail with reference to the accompanying drawings. The exemplary embodiments of the present utility model and their descriptions herein are for the purpose of explaining the present utility model, but are not to be construed as limiting the utility model.
The ammonia reliquefaction system provided by the embodiment of the utility model compresses, cools, decompresses and returns ammonia formed in the liquid ammonia storage tank to the liquid ammonia storage tank after treatment, thereby improving the utilization rate of ammonia fuel.
As shown in fig. 1, the ammonia reliquefaction system provided in this embodiment includes a liquid ammonia storage tank 1, an ammonia compressor 2 and an ammonia cooler 3 which are sequentially connected, wherein the ammonia cooler 3 is connected with the liquid ammonia storage tank 1 through a throttle expansion valve 4; wherein:
The liquid ammonia storage tank 1 is a low-temperature liquid ammonia storage tank and is used for storing ammonia fuel, wherein the normal working temperature is lower than 0 ℃ and the normal working pressure is lower than 0.5MPaG;
The ammonia compressor 2 is connected with the liquid ammonia storage tank 1 and is used for carrying out pressurization treatment on the ammonia output from the liquid ammonia storage tank 1, and the output pressure is 1.0-1.6MPaG;
The ammonia cooler 3 is connected with the ammonia compressor 2 and is used for cooling the high-temperature and high-pressure ammonia gas output by the ammonia compressor 2;
The throttle expansion valve 4 is connected with the ammonia cooler 3 and is used for decompressing the liquid ammonia output by the ammonia cooler 3, and part of the decompressed liquid ammonia is gasified to generate steam;
the throttle expansion valve 4 is also connected with the liquid ammonia storage tank 1 and is used for sending the liquid ammonia and the steam obtained by decompression back to the liquid ammonia storage tank 1, and the liquid ammonia storage tank 1 obtains cold energy, so that the reliquefaction of the ammonia gas is realized, and the recovery of the ammonia gas is realized.
As shown in fig. 2, preferably, the ammonia reliquefaction system provided in this embodiment includes a liquid ammonia storage tank 1, an ammonia heater 5, an ammonia compressor 2, an ammonia cooler 3 and a liquid ammonia collecting storage tank 6 which are sequentially connected, wherein the liquid ammonia collecting storage tank 6 is connected with the liquid ammonia storage tank 1 through a throttle expansion valve 4; wherein:
The liquid ammonia storage tank 1 is a low-temperature liquid ammonia storage tank and is used for storing ammonia fuel, wherein the normal working temperature is lower than 0 ℃ and the normal working pressure is lower than 0.5MPaG;
The ammonia heater 5 is connected with the liquid ammonia storage tank 1 and is used for heating the ammonia gas output from the liquid ammonia storage tank 1;
The ammonia compressor 2 is connected with the ammonia heater 5 and is used for pressurizing the heated ammonia output by the ammonia heater 5, and the output pressure is 1.0-1.6MPaG;
The ammonia cooler 3 is connected with the ammonia compressor 2 and is used for cooling the high-temperature and high-pressure ammonia gas output by the ammonia compressor 2;
The liquid ammonia collecting storage tank 6 is connected with the ammonia cooler 3 and is used for storing the liquid ammonia output from the ammonia cooler 3;
The throttle expansion valve 4 is connected with the liquid ammonia collecting storage tank 6 and is used for decompressing the liquid ammonia output by the liquid ammonia collecting storage tank 6, and part of the decompressed liquid ammonia is gasified to generate steam;
the throttle expansion valve 4 is also connected with the liquid ammonia storage tank 1 and is used for sending the liquid ammonia and the steam obtained by decompression back to the liquid ammonia storage tank 1, and the liquid ammonia storage tank 1 obtains cold energy, so that the reliquefaction of the ammonia gas is realized, and the recovery of the ammonia gas is realized.
In some embodiments of the present utility model, the ammonia gas compressor 2 may be one-stage compression or multi-stage compression to achieve an output pressure of 1.0-1.6 MPaG. In the case of multi-stage compression, an inter-stage cooler may be provided between each stage to cool the compressed ammonia gas.
In some embodiments of the present utility model, the cooling medium of the ammonia cooler 3 may be normal temperature seawater or other readily available medium, and the temperature of the medium is lower than 40 ℃.
In some embodiments of the present utility model, an ammonia heater 5 is disposed between the liquid ammonia storage tank 1 and the ammonia compressor 2, and is configured to heat the ammonia output from the liquid ammonia storage tank 1 to an air inlet temperature range required by the ammonia compressor 2, so that compression efficiency of the ammonia compressor 2 can be improved, and work load of the ammonia compressor 2 can be reduced.
In some embodiments of the present utility model, a liquid ammonia collecting tank 6 is disposed between the ammonia cooler 3 and the throttle expansion valve 4, and is used for storing cooled liquid ammonia, where other parts of the liquid ammonia may be used for other parts besides the decompression treatment performed by the throttle expansion valve 4. The liquid ammonia collecting tank 6 is also arranged to be helpful for collecting the possibly remained unliquefaction ammonia in the ammonia cooler 3, and the ammonia can be returned to the air inlet pipeline of the ammonia compressor 2 for compression cooling.
In some embodiments of the present utility model, an ammonia reliquefaction system includes, in addition to a liquid ammonia storage tank 1, an ammonia heater 5, an ammonia compressor 2 and an ammonia cooler 3 that are sequentially connected, the ammonia cooler 3 is connected with the liquid ammonia storage tank 1 through a throttle expansion valve 4; the system does not contain the liquid ammonia collecting tank 6, and the connection and the function of each device in the system can be referred to the above embodiment, and will not be repeated here.
In some embodiments of the present utility model, an ammonia reliquefaction system includes, in addition to a liquid ammonia storage tank 1, an ammonia compressor 2, an ammonia cooler 3, and a liquid ammonia collection storage tank 6 that are sequentially connected, the liquid ammonia collection storage tank 6 is connected to the liquid ammonia storage tank 1 through a throttle expansion valve 4; the system does not contain an ammonia heater 5, and the connection and the function of each device in the system can be referred to the above embodiment, and will not be described herein.
Embodiments provide a method of reliquefaction of ammonia gas, which may include:
S1, an ammonia compressor 2 obtains ammonia output by a liquid ammonia storage tank 1 and pressurizes the ammonia to obtain high-temperature high-pressure ammonia;
S2, cooling high-temperature high-pressure ammonia gas by an ammonia cooler 3 to obtain high-pressure liquid ammonia;
S3, performing decompression treatment on the high-pressure liquid ammonia by using a throttle expansion valve 4 to obtain low-pressure liquid ammonia and steam;
S4, recovering the pressure liquid ammonia and steam from the liquid ammonia storage tank 1 to realize the reliquefaction of ammonia;
S5, circularly executing the steps until the liquid ammonia storage tank 1 is at normal working pressure.
Another embodiment of the present utility model provides a method for reliquefaction of ammonia gas, which may include:
S1, an ammonia heater 5 obtains ammonia gas output by a liquid ammonia storage tank 1 and heats the ammonia gas to obtain heated ammonia gas;
S2, pressurizing the heated ammonia by an ammonia compressor 2 to obtain high-temperature high-pressure ammonia;
S3, cooling the high-temperature high-pressure ammonia gas by an ammonia cooler 3 to obtain high-pressure liquid ammonia;
S4, the throttle expansion valve 4 decompresses the high-pressure liquid ammonia to obtain low-pressure liquid ammonia and steam;
s5, recovering the pressure liquid ammonia and steam from the liquid ammonia storage tank 1 to realize the reliquefaction of ammonia;
S6, circularly executing the steps until the liquid ammonia storage tank 1 is at normal working pressure.
It should be noted that, the steps in the method provided by the present utility model may be implemented by using corresponding devices in the system, etc., and those skilled in the art may refer to a technical scheme of the system to implement a step flow of the method, that is, an embodiment in the system may be understood as a preferred example of the implementation method, which is not described herein.
According to the ammonia reliquefaction system and method provided by the embodiment of the utility model, when the pressure in the liquid ammonia storage tank exceeds the working pressure, ammonia is released, the ammonia is compressed by the ammonia compressor, then the easily obtained seawater or other cooling media are used for cooling to obtain liquid ammonia, then a throttling expansion valve is used for obtaining a throttling pressure reduction and simultaneously obtaining a cold source, and the cold source flows back to the liquid ammonia storage tank, so that the temperature and the pressure in the liquid ammonia storage tank are reduced, the liquid ammonia storage tank can recover the ammonia and reach the normal working temperature and the normal working pressure at the same time, the reliquefaction effect of the whole system is good, the process flow is simple, the operation is easy, the equipment investment is less, and the safety problem caused by the pressure rise in the liquid ammonia low-temperature storage process is solved.
Claims (3)
1. The ammonia reliquefaction system is characterized by comprising a liquid ammonia storage tank, an ammonia compressor and an ammonia cooler which are sequentially connected, wherein the ammonia cooler is connected with the liquid ammonia storage tank through a throttling expansion valve; wherein:
ammonia in the liquid ammonia storage tank is introduced into the ammonia compressor, and the ammonia is pressurized through the gas compressor;
The pressurized ammonia in the ammonia compressor is introduced into the ammonia cooler and is cooled to liquid ammonia through the ammonia cooler;
and the liquid ammonia in the ammonia cooler is returned to the liquid ammonia storage tank through a throttle expansion valve.
2. The system of claim 1, further comprising an ammonia heater disposed between the liquid ammonia storage tank and the ammonia compressor, the ammonia heater configured to heat the ammonia output from the liquid ammonia storage tank to an inlet air temperature range required by the ammonia compressor.
3. The system of claim 1, further comprising a liquid ammonia collection reservoir disposed between the ammonia cooler and the throttle expansion valve, the liquid ammonia collection reservoir for storing cooled high pressure liquid ammonia.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322339717.6U CN220829003U (en) | 2023-08-30 | 2023-08-30 | Ammonia reliquefaction system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322339717.6U CN220829003U (en) | 2023-08-30 | 2023-08-30 | Ammonia reliquefaction system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220829003U true CN220829003U (en) | 2024-04-23 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322339717.6U Active CN220829003U (en) | 2023-08-30 | 2023-08-30 | Ammonia reliquefaction system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220829003U (en) |
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2023
- 2023-08-30 CN CN202322339717.6U patent/CN220829003U/en active Active
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