CN115571317A - Mechanical ventilation system for fuel place of ammonia fuel ship - Google Patents
Mechanical ventilation system for fuel place of ammonia fuel ship Download PDFInfo
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- CN115571317A CN115571317A CN202211291724.7A CN202211291724A CN115571317A CN 115571317 A CN115571317 A CN 115571317A CN 202211291724 A CN202211291724 A CN 202211291724A CN 115571317 A CN115571317 A CN 115571317A
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- ammonia
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- ammonia fuel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63J—AUXILIARIES ON VESSELS
- B63J2/00—Arrangements of ventilation, heating, cooling, or air-conditioning
- B63J2/02—Ventilation; Air-conditioning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63J—AUXILIARIES ON VESSELS
- B63J2/00—Arrangements of ventilation, heating, cooling, or air-conditioning
- B63J2/02—Ventilation; Air-conditioning
- B63J2/06—Ventilation; Air-conditioning of engine rooms
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
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Abstract
The invention relates to a mechanical ventilation system of a fuel place of an ammonia fuel ship, wherein a ventilation system of an ammonia fuel filling station, a ventilation system of an ammonia fuel connecting pipe place and a ventilation system of an ammonia fuel processing room adopt a mechanical air exhaust and natural air inlet mode, and two fans are arranged, one fan is used and the other fan is standby and connected with different power supply systems to ensure continuous ventilation; air outlets are arranged at the upper part and the bottom of the cabin according to the physical property of the ammonia fuel; the fan is interlocked with the filling system, and when the fan fails, the filling system stops filling; the tail end of the ventilation system selects a hood or a shutter type according to the position of the cabin; when the air pipe passes through other places, a fireproof air brake and A-60 heat insulation are added according to the requirement; the ventilation system between the air locks adopts a mechanical air supply and natural air exhaust mode to ensure the positive pressure of the cabin for isolating dangerous gas, a pressure difference sensor is arranged indoors to detect the pressure difference between the indoor air and the adjacent fuel, and an audible and visual alarm is given out when the pressure is lost. The invention can effectively prevent the accumulation and diffusion of leaked ammonia fuel.
Description
Technical Field
The invention relates to the technical field of ship ventilation, in particular to a ventilation system for a fuel place of an ammonia fuel ship.
Background
Increased greenhouse gas emissions are one of the important causes of global warming. In order to reduce the greenhouse gas emission of the maritime industry, the International Maritime Organization (IMO) proposed that the greenhouse gas emission reduction plan in 2018 reduced the greenhouse gas emission of the maritime industry by 50% in 2050 compared with 2008. In recent years, the industry has actively researched and researched alternative fuels for ships, and among them, ammonia power fuel which is easy to liquefy, convenient to store and transport, and free from carbon dioxide during combustion attracts much attention.
Ammonia has an alkaline property and strong irritation, and if a human body is exposed for a long time, the ammonia may damage exposed tissues such as eyes, and after the ammonia is inhaled by the human body, symptoms such as laryngitis and bronchitis may be caused, and suffocation may be caused seriously. In addition, ammonia comes into contact with water vapor in the air, which causes corrosion of the ship hull, and when combined with other substances in the air, can generate ultrafine dust which is explosive. Therefore, good ventilation needs to be ensured in connection with ammonia fuel.
Disclosure of Invention
The invention aims to provide a mechanical ventilation system for a fuel place of an ammonia fuel ship, which is used for solving the ventilation problem of the fuel place of the ammonia fuel ship, ensuring the safety of fuel filling and using processes and avoiding the harm of ammonia leakage to the environment and crews.
In order to realize the purpose, the technical scheme of the invention is as follows: a mechanical ventilation system for a fuel place of an ammonia fuel ship comprises a ventilation system for an ammonia fuel filling station, a ventilation system for an ammonia fuel connecting pipe, a ventilation system for an ammonia fuel processing room and a ventilation system for an air lock room, wherein the ventilation system for the ammonia fuel filling station, the ventilation system for the ammonia fuel connecting pipe and the ventilation system for the ammonia fuel processing room adopt a mechanical air exhaust mode and a natural air inlet mode; according to the physical property of the ammonia fuel, air outlets are arranged at the upper part and the bottom of the cabin; the fan is interlocked with the filling system, and when the fan fails, the filling system stops filling; the tail end of the ventilation system reasonably selects a hood or a shutter type according to the position of the cabin; when the air pipe passes through other places, a fireproof air brake and A-60 heat insulation are added according to the requirement; the ventilation system between the air locks adopts a mechanical air supply and natural air exhaust mode to ensure the positive pressure of the cabin for isolating dangerous gas, a pressure difference sensor is arranged indoors to detect the pressure difference between the air locks and adjacent fuel, and an audible and visual alarm is given out when the pressure is lost.
Furthermore, ventilation system that ammonia fuel filling station ventilation system, ammonia fuel takeover department place ventilation system and ammonia fuel are handled between ventilation system all adopt mechanical convulsions, natural air inlet mode, guarantee that this cabin is the negative pressure state, prevent to reveal the diffusion of ammonia fuel.
Furthermore, the explosion-proof grade of two exhaust fans in the ventilation system of the ammonia fuel filling station, the ventilation system of the ammonia fuel connecting pipe and the ventilation system of the ammonia fuel processing room is ExdIIBT4, one exhaust fan is used under the normal working condition, the other exhaust fan is used under the emergency working condition, the capacity of the fan under the emergency working condition is 1.5 times that under the normal working condition, and the leaked ammonia fuel can be conveniently and quickly removed.
Furthermore, the exhaust pipelines corresponding to the two exhaust fans of the ventilation system at the ammonia fuel filling station, the ventilation system at the ammonia fuel connecting pipe and the ventilation system at the ammonia fuel processing room are provided with non-return air brakes, so that the exhaust fans are prevented from exhausting air from the standby exhaust pipeline, and air flow is prevented from circulating in the cabin.
Further, exhaust vents at the ammonia fueling station, the ammonia fuel processing compartment, and the ammonia fuel spud are partially disposed at the top of the chamber for exhausting the gaseous ammonia fuel, and partially disposed at the bottom of the chamber for exhausting the liquid ammonia fuel.
Further, when the ammonia fuel filling station, the ammonia fuel connecting pipe and the ammonia fuel processing room are positioned below the main deck, the blast pipe and the exhaust pipe are connected with the plenum box, the top of the cabin is provided with a fan base, an A-60 fireproof air brake and an air cap, and airflow is exhausted out of the room from the top of the cabin, wherein the fireproof air brake is used for ensuring the integrity of the fireproof grade of the cabin wall.
Further, when the ammonia fuel filling station, the ammonia fuel connecting pipe and the ammonia fuel processing room are positioned on the main deck, the blast pipe and the exhaust pipe are connected with the static pressure box, the side wall of the cabin is provided with a weather tight steel shutter, the wind pipe is provided with an A-60 fireproof air brake, and a ventilation pipeline between the fireproof air brake and the shutter is coated with A-60 fireproof insulation, so that the integrity of the fireproof level of the cabin wall is ensured.
Further, the ammonia fuel filling station is a semi-open cabin, mechanical air draft is adopted for ventilation, natural air inlet is borrowed from an opening of the cabin, and a natural air inlet pipeline is not arranged; an exhaust fan of the ammonia fuel filling station is linked with the fuel filling system, and the filling system is started after the fan normally operates.
Further, a differential pressure sensor is arranged between the air locks, and a positive pressure signal is output to a monitoring alarm system; when the pressure between the air locks is lost, the sound and light alarm is sent out.
Furthermore, an air adjusting door is arranged on a natural exhaust pipeline of the air lock chamber, and positive pressure of the air lock chamber is ensured by adjusting the exhaust air quantity.
The invention has the beneficial effects that:
1) The invention provides a mechanical ventilation system for an ammonia fuel place, which consists of a ventilation system of an ammonia fuel filling station, a ventilation system of an ammonia fuel connecting pipe place, a ventilation system of an ammonia fuel processing room and a ventilation system of an air lock room, and can effectively prevent leaked ammonia fuel from accumulating and diffusing.
2) In the whole system, the ammonia fuel filling station, the ammonia fuel treatment room and the two fans at the ammonia fuel take-over pipe are respectively connected to different power systems, and when one fan fails, the other fan is immediately started to ensure the continuous ventilation of the cabin.
3) The two fans at the ammonia fuel filling station, the ammonia fuel treatment room and the ammonia fuel connection pipe are interlocked with the filling system, and when the cabin fans fail, the filling system stops running, so that the safety of the ammonia fuel system is further improved.
4) The ventilation systems between the air locks corresponding to the ammonia fuel filling station, the ammonia fuel processing room and the ammonia fuel connecting pipe can ensure positive pressure between the air locks, and further prevent the diffusion of leaked ammonia fuel.
Drawings
FIG. 1 is a schematic top view of ammonia fuel spuds/ammonia fuel processing compartment ventilation;
FIG. 2 isbase:Sub>A cross-sectional view A-A of the ammonia fuel spud/ammonia fuel processing compartment venting principle;
FIG. 3 is a cross-sectional view B-B of ammonia fuel spud/ammonia fuel processing compartment ventilation principles;
FIG. 4 is a first schematic view of the air intake/exhaust end of the ventilation system;
FIG. 5 is a schematic diagram of the intake/exhaust end of the ventilation system;
FIG. 6 is a schematic view of the mechanical ventilation of a semi-open filling station;
FIG. 7 is a schematic view of mechanical ventilation between the airlocks;
FIG. 8 is a diagram of an ammonia fuel district ventilation arrangement for a certain type of ship;
FIG. 9 is a side view of a fuel area compartment of a certain type of ship;
in the figure: 1. ammonia fuel take-over place/ammonia fuel treatment room No. 1 exhaust fan, ammonia fuel take-over place/ammonia fuel treatment room No. 2 exhaust fan, ammonia fuel take-over place/ammonia fuel treatment room No. 1 non return air brake, ammonia fuel take-over place/ammonia fuel treatment room No. 2 non return air brake, ammonia fuel filling station/ammonia fuel take-over place/ammonia fuel treatment room top exhaust grille, 6 air supply ventilation system/exhaust end, 7 ventilation system static pressure box, 8 fan base, 9 ammonia fuel take-over place/ammonia fuel treatment room air supply grille, 10, a bacterial type air cap, 11, a weathertight steel shutter, 12.A-60 grade fireproof air brakes, 13 ammonia fuel filling station/ammonia fuel connection pipe position/ammonia fuel processing room bottom exhaust grilles, 14, an ammonia fuel filling station No. 1 fan, 15, an ammonia fuel filling station No. 2 fan, 16, an ammonia fuel filling station No. 1 check air brake, 17, an ammonia fuel filling station No. 2 check air brake, 18, an air lock room blower, 19, an air lock room air supply grille, 20, an air lock room air adjusting door, 21, an air lock room exhaust grille and 22, a pressure difference sensor.
Detailed Description
The invention is further described with reference to the following figures and examples.
As shown in fig. 1 to 7, a mechanical ventilation system for a fuel station of an ammonia-fueled ship according to the present invention includes: an ammonia fueling station ventilation system, an ammonia spud location ventilation system, an ammonia fuel processing compartment ventilation system, and an airlock compartment ventilation system.
The ammonia fuel filling station, the ammonia fuel connecting pipe and the ventilation system of the ammonia fuel processing room adopt a mechanical air exhaust and natural air inlet mode, two fans are configured, one fan is used, the other fan is standby and is connected with different power systems, so that continuous ventilation is ensured; according to the physical property of the ammonia fuel, air outlets are arranged at the upper part and the bottom of the cabin; the fan is interlocked with the filling system, and when the fan fails, the filling system stops filling; the tail end of the ventilation system reasonably selects a hood or a shutter type according to the position of the cabin; when the air pipe passes through other places, a fireproof air brake and A-60 heat insulation are added according to the requirement.
The air lock adopts mechanical air supply and natural air exhaust modes to ensure positive pressure in the cabin for isolating dangerous gas, a pressure difference sensor is arranged indoors to detect the pressure difference between adjacent fuels, and sound and light alarm is given out when the pressure is lost. The ammonia fuel filling station, the ammonia fuel connecting pipe and the ammonia fuel treatment room all adopt a mechanical air draft and natural air inlet mode, the cabin is guaranteed to be in a negative pressure state, and leaked ammonia fuel is prevented from diffusing.
Explosion-proof grades of two exhaust fans between ammonia fuel processing room, ammonia fuel filling station, ammonia fuel takeover place and place are ExdIIBT4, use under the normal operating mode of a 1 number exhaust fan, use when 2 numbers exhaust fan emergency operating mode, and fan capacity is 1.5 times under the normal operating mode under the emergency operating mode, is convenient for get rid of the ammonia fuel of revealing fast.
And non-return air brakes, a No. 1 non-return air brake 3, a No. 2 non-return air brake 4, a No. 1 non-return air brake 16 of the ammonia fuel filling station and a No. 2 non-return air brake 17 of the ammonia fuel filling station are arranged on exhaust pipelines corresponding to two exhaust fans of the ammonia fuel filling station, the ammonia fuel connecting pipe and the ammonia fuel processing room, so that the exhaust fans are prevented from exhausting air from a standby exhaust pipeline, and airflow is prevented from circulating in the cabin.
The ammonia fuel is in liquid state when stored, and is converted into gas state in large quantity due to pressure loss after leakage, and part of the ammonia fuel is still in liquid state after conversion, so that the top of the ammonia fuel filling station, the ammonia fuel connecting pipe and the ammonia fuel processing room is provided with an exhaust grille 5 for exhausting the gaseous ammonia fuel, and the bottom of the ammonia fuel filling station is provided with an exhaust grille 13 for exhausting the liquid ammonia fuel.
When the ammonia fuel filling station, the ammonia fuel connecting pipe and the ammonia fuel processing room are positioned below the main deck, the air supply and exhaust tail ends are communicated with the outside, so the air supply pipe and the exhaust pipe are connected with the static pressure box 7 of the ventilation system, the top of the cabin is provided with a fan base 8, an A-60 fireproof air brake 12 and an air cap 10, and the airflow is exhausted out of the room from the top of the cabin, wherein the fireproof air brake is used for ensuring the integrity of the fireproof grade of the cabin wall.
When the ammonia fuel filling station, the ammonia fuel connecting pipe and the ammonia fuel processing room are positioned on the main deck, the blast pipe and the exhaust pipe are connected with the static pressure box 7 of the ventilation system, the side wall of the cabin is provided with a weather tight steel shutter 11, the air pipe is provided with an A-60 fireproof air brake 12, and the ventilation pipeline between the fireproof air brake and the shutter is coated with A-60 fireproof insulation, so that the integrity of the fireproof level of the cabin wall is ensured.
The ammonia fuel filling station is a semi-open cabin, a ventilation system adopts a mechanical air exhaust and natural air inlet mode, natural air inlet is borrowed from an opening of the cabin, and a natural air inlet pipeline is not arranged.
A fan 14 of an ammonia fuel filling station No. 1 and a fan 15 of the ammonia fuel filling station No. 2 of the ammonia fuel filling station are linked with a fuel filling system, and after the fans normally operate, the filling system is started.
The air lock adopts a mechanical air supply and natural air exhaust mode to ensure positive pressure, so that the ammonia fuel is not diffused to the outside after being leaked.
A pressure difference sensor 22 is arranged between the air locks, positive pressure signals are output to a monitoring alarm system, sound and light alarm is given out when the pressure is lost, an air adjusting door 20 is arranged on a natural exhaust pipeline between the air locks, and the positive pressure between the air locks is ensured by adjusting the exhaust air quantity.
A mechanical ventilation system at the fuel place of the ammonia fuel ship is characterized in that an air pipe passes through other areas outside each cabin and is externally wrapped with A-60-grade fireproof insulation according to requirements.
Example (b):
as shown in fig. 1 to 7, when ammonia is used as fuel, it is usually liquefied and stored in a pressurized tank or a cryogenic tank for transportation, and then gasified and delivered to a power unit when in use, and in the whole process, the places where a ventilation system is required to be configured include: ammonia fueling STATIONs (BUNKER STATIONs), ammonia fuel take-over locations (TCSs), ammonia fuel processing bays (FGHR), and AIR LOCK bays (AIR LOCK).
Among the four main places, the ventilation systems between the ammonia fuel connecting pipe place and the ammonia fuel processing room all adopt a mechanical air exhaust and natural air inlet mode, two cabin fans are arranged and are connected with different power supply systems, the fan 1 is used for ventilation under a normal state, the fan 2 is used for ventilation under an emergency state, the fan is in an explosion-proof grade ExdIIBT4, two exhaust pipes are provided with non-return air brakes to prevent short circuit of air flow, and the specific principle is shown in figures 1-3. The air inlet and outlet tail ends can be selected to be in a hood type or a shutter type according to the position of the cabin, as shown in figures 4 and 5.
In order to facilitate filling, an ammonia fuel filling station is respectively arranged on the left side and the right side of the ship. The filling station has three types: fully closed, semi-open, and open. Wherein, the totally enclosed filling station is not beneficial to the operation and maintenance of the filling system, and is rarely adopted. The whole open filling station is exposed outside, and a ventilation system is not required to be configured. A ventilation system of the semi-open type filling station adopts a mechanical air exhaust and natural air inlet mode. The mechanical exhaust pipeline is similar to the ammonia fuel treatment room and the ammonia fuel connecting pipe, and natural air intake utilizes the broadside opening and is not provided with an independent air pipe system, and the principle is shown in fig. 6.
The ammonia fuel is a dangerous gas, and when the main chamber related to the ammonia fuel is communicated with the outside, an air lock chamber is required to be arranged so as to further prevent the leaked ammonia fuel from diffusing to the outside. The ventilation system principle among each airlock is similar, a mechanical air supply and natural air exhaust mode is adopted, the positive pressure at the adjacent position is kept to be not lower than 25Pa, and the principle is shown in figure 7.
Fans of the ammonia fuel take-over place, the ammonia fuel treatment room and the ammonia fuel filling station are interlocked with the filling system, and when the fans fail, filling is stopped, so that the safety of the ammonia fuel system is ensured.
A fuel filling station: piping and facilities required for refueling are provided for transporting the external fuel to the fuel storage tank. In order to match with a filling ship, the filling stations are usually arranged on the port side and the starboard side respectively, and the ventilation principle of the two filling stations is the same.
The fuel take-over place: is positioned right above the fuel storage cabin, and the filling and conveying system pipe is connected with the fuel storage cabin through the cabin.
A fuel processing room: the ammonia fuel is pretreated to provide fuel meeting requirements for the main engine and the auxiliary engine.
An air lock chamber: the ammonia fuel-related compartment is isolated from the outside, and the ventilation principle of each airlock is similar.
Fig. 8 and 9 show the ventilation arrangement of the ammonia fuel place of a container ship of a certain type, wherein the area is positioned below the main deck, the filling station adopts a semi-open type, and the air supply/exhaust end of each cabin adopts a top hood mode.
Claims (10)
1. A mechanical ventilation system for a fuel place of an ammonia-fueled ship, characterized in that: the system comprises an ammonia fuel filling station ventilation system, an ammonia fuel connecting pipe ventilation system, an ammonia fuel processing room ventilation system and an air lock room ventilation system, wherein the ammonia fuel filling station ventilation system, the ammonia fuel connecting pipe ventilation system and the ammonia fuel processing room ventilation system adopt a mechanical air exhaust mode and a natural air inlet mode, and two fans are arranged, one fan is used, the other fan is standby and is connected with different power supply systems to ensure continuous ventilation; according to the physical property of the ammonia fuel, air outlets are arranged at the upper part and the bottom of the cabin; the fan is interlocked with the filling system, and when the fan fails, the filling system stops filling; the tail end of the ventilation system reasonably selects a hood or a shutter type according to the position of the cabin; when the air pipe passes through other places, a fireproof air brake and A-60 heat insulation are added according to the needs; the ventilation system between the air locks adopts a mechanical air supply and natural air exhaust mode to ensure the positive pressure of the cabin for isolating dangerous gas, a pressure difference sensor is arranged indoors to detect the pressure difference between the indoor air and the adjacent fuel, and an audible and visual alarm is given out when the pressure is lost.
2. The ammonia-fueled marine fuel station machinery ventilation system according to claim 1, characterized in that: ventilation system that ammonia fuel filling station ventilation system, ammonia fuel takeover locate ventilation system and ammonia fuel processing room ventilation system all adopt mechanical convulsions, the mode of natural air inlet, guarantee that this cabin is negative pressure state, prevent that the ammonia fuel of revealing from diffusing.
3. The ammonia-fueled marine fuel station machinery ventilation system according to claim 1, characterized in that: the explosion-proof level of two exhaust fans in the ventilation system of the ammonia fuel filling station, the ventilation system of the ammonia fuel connecting pipe and the ventilation system of the ammonia fuel processing room is ExdIIBT4, one exhaust fan is used under the normal working condition, the other exhaust fan is used under the emergency working condition, the capacity of the fan under the emergency working condition is 1.5 times of that under the normal working condition, and leaked ammonia fuel can be conveniently and quickly removed.
4. The ammonia-fueled marine fuel station machinery ventilation system according to claim 1, characterized in that: and non-return air brakes are arranged on exhaust pipelines corresponding to two exhaust fans of the ventilation system of the ammonia fuel filling station, the ventilation system of the ammonia fuel connecting pipe and the ventilation system of the ammonia fuel processing room, so that the exhaust fans are prevented from exhausting air from a standby exhaust pipeline, and air flow is prevented from circulating in the cabin.
5. The ammonia-fueled marine fuel station machinery ventilation system according to claim 1, characterized in that: the exhaust outlets of the ammonia refueling station, the ammonia fuel treatment room and the ammonia fuel adapter are partially arranged on the top of the chamber and used for exhausting gaseous ammonia fuel, and partially arranged on the bottom of the chamber and used for exhausting liquid ammonia fuel.
6. The ammonia-fueled marine fuel station machinery ventilation system according to claim 1, characterized in that: when the ammonia fuel filling station, the ammonia fuel connecting pipe and the ammonia fuel processing room are positioned below the main deck, the blast pipe and the exhaust pipe are connected with the static pressure box, the top of the cabin is provided with a fan base, an A-60 fireproof air brake and an air cap, and airflow is exhausted out of the room from the top of the cabin, wherein the fireproof air brake is used for ensuring the integrity of the fireproof grade of the cabin wall.
7. The ammonia-fueled marine fuel station machinery ventilation system according to claim 1, characterized in that: when the ammonia fuel filling station, the ammonia fuel connecting pipe and the ammonia fuel processing room are positioned on the main deck, the blast pipe and the exhaust pipe are connected with the static pressure box, the side wall of the cabin is provided with a weather-tight steel shutter, the wind pipe is provided with an A-60 fireproof air brake, and the ventilation pipeline between the fireproof air brake and the shutter is coated with A-60 fireproof insulation, so that the integrity of the fireproof level of the cabin wall is ensured.
8. The marine ammonia fuelled venue mechanical venting system according to claim 1, wherein: the ammonia fuel filling station is a semi-open cabin, a ventilation system adopts a mechanical air exhaust and natural air inlet mode, natural air inlet is realized by virtue of an opening of the cabin, and a natural air inlet pipeline is not arranged; an exhaust fan of the ammonia fuel filling station is interlocked with the fuel filling system, and the filling system is started after the fan operates normally.
9. The ammonia-fueled marine fuel station machinery ventilation system according to claim 1, characterized in that: a differential pressure sensor is arranged between the air locks, and a positive pressure signal is output to a monitoring alarm system; when the pressure between the air locks is lost, the sound and light alarm is sent out.
10. The ammonia-fueled marine fuel station machinery ventilation system according to claim 1, characterized in that: an air adjusting door is arranged on a natural exhaust pipeline of the air lock chamber, and positive pressure of the air lock chamber is ensured by adjusting the exhaust air quantity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211291724.7A CN115571317A (en) | 2022-10-19 | 2022-10-19 | Mechanical ventilation system for fuel place of ammonia fuel ship |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211291724.7A CN115571317A (en) | 2022-10-19 | 2022-10-19 | Mechanical ventilation system for fuel place of ammonia fuel ship |
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| Publication Number | Publication Date |
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| CN115571317A true CN115571317A (en) | 2023-01-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211291724.7A Pending CN115571317A (en) | 2022-10-19 | 2022-10-19 | Mechanical ventilation system for fuel place of ammonia fuel ship |
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| CN (1) | CN115571317A (en) |
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- 2022-10-19 CN CN202211291724.7A patent/CN115571317A/en active Pending
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