An ammonia fuel double-hull tanker

Abstract

The utility model relates to the technical fields of ammonia fuel ship, specifically relates to a kind of ammonia fuel double ear can ship, including hull, deck, saddle and double ear fuel tank, deck is located at the top of hull, and hull and deck are enclosed into isolated cabin, saddle and double ear fuel tank are located in isolated cabin, saddle is fixed on hull, double ear fuel tank is installed on saddle, further include nitrogen generator, nitrogen generator inside has air compressor and drying unit, nitrogen generator is sent dry air to isolated cabin by dry air pipeline, isolated cabin side is connected with air supply pipeline, other side is connected with exhaust pipeline, dry air pipeline, air supply pipeline and exhaust pipeline are all provided with dew point sensor, nitrogen generator is arranged between air supply pipeline and exhaust pipeline, air supply pipeline and exhaust pipeline are all equipped with electrically-operated shut-off air valve. Dry air is sent to isolated cabin by dry air pipeline, effectively avoid the safety hazard caused by humid air into cabin to gas storage tank.

Description

Technical Field

[0001] This utility model relates to the technical field of ammonia-fueled ships, specifically to an ammonia-fueled double-eared tank ship. Background Technology

[0002] Ammonia fuel, as a clean energy source, is increasingly widely used in the marine industry. Due to its compact structure and high adaptability, double-ear fuel tanks are gradually becoming the core fuel storage solution for mainstream ship types such as car carriers, container ships, and bunkering vessels. In large ships, double-ear fuel tanks can be installed inside the hold or on the deck, with their placement taking into account space utilization, safety, and economy.

[0003] Existing dual-fuel vessels include a deck, a base, and refueling stations. The base is fixed to the middle of the aft section of the deck near the stern. The dual-fuel vessel also includes two-eared gas tanks located above the base. Two refueling stations are located on either side of the two-eared gas tanks. By arranging the two-eared gas tanks in the middle of the vessel and setting up refueling stations on both sides, the vessel can refuel from either side, significantly reducing the workload required for refueling on both sides of the dual-tank vessel. Because there is a risk of ammonia leakage from the gas tanks, the base and the gas tanks on it are stored in a sealed, empty compartment, and an ammonia leak alarm system is installed to promptly detect any leaks.

[0004] The empty compartment requires regular inspections by security personnel to check the gas tanks. However, because the empty compartment is a sealed space, it needs to be opened at one end for a period of time to allow air to enter before personnel can enter. Due to the high humidity of the air, entering the empty compartment can easily pose a safety hazard to the gas tanks. Utility Model Content

[0005] The purpose of this invention is to provide a vessel with ammonia fuel double-eared tanks that solves the problems mentioned in the background art by adding drying equipment.

[0006] To achieve the above objectives, the present invention provides a vessel with ammonia fuel dual-ear tanks, comprising a hull, a deck, a saddle, and dual-ear fuel tanks. The deck is located on top of the hull, and the hull and the deck enclose an isolation compartment. The saddle and the dual-ear fuel tanks are located within the isolation compartment. The saddle is fixed to the hull, and the dual-ear fuel tanks are mounted on the saddle. The vessel also includes a nitrogen generator, which contains an air compressor and a drying unit. The nitrogen generator supplies dry air to the isolation compartment via a dry air pipeline. One side of the isolation compartment is connected to an air supply pipeline, and the other side is connected to an exhaust pipeline. Dew point sensors are installed on the dry air pipeline, the air supply pipeline, and the exhaust pipeline. The nitrogen generator is positioned between the air supply pipeline and the exhaust pipeline. Both the air supply pipeline and the exhaust pipeline are equipped with electrically operated shut-off valves. The nitrogen generator performs inerting and replacement of the dual-ear fuel tanks via the nitrogen pipeline.

[0007] Furthermore, a refueling station is arranged on each of the port and starboard sides of the deck. The top of the double-eared fuel tank is equipped with a dome. The refueling station's liquid supply pipeline is connected to the dome. The evaporated gas in the double-eared fuel tank passes through the dome and returns to the refueling station through the return gas pipeline.

[0008] Furthermore, the nitrogen pipeline is connected to the liquid supply pipeline and the return gas pipeline, and the two pipelines are purged and inerted.

[0009] Furthermore, the isolation chamber is equipped with an ammonia concentration gas sensor and an audible and visual alarm. The ammonia concentration gas sensor is electrically connected to the audible and visual alarm. When the ammonia concentration gas sensor detects that the ammonia concentration has reached a first threshold, the audible and visual alarm will start to sound.

[0010] Furthermore, there are at least two ammonia concentration gas sensors, and a water spray pipeline is connected inside the isolation chamber. When multiple ammonia concentration gas sensors detect that the ammonia concentration has reached the second threshold, the water spray pipeline is activated and sprays water into the isolation chamber.

[0011] Furthermore, a sewage well is provided at the bottom of the saddle, which collects ammonia solution. The sewage well is equipped with a bilge pump, which can discharge the ammonia solution to the outside of the ship.

[0012] Furthermore, the sewage well is equipped with a liquid level alarm, which is used to detect whether the ammonia solution in the sewage well is leaking.

[0013] Furthermore, an equipment room is provided on the deck, and the nitrogen generator is located in the equipment room.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. Under normal pressure, the dew point sensor is set to ≤-40°C. When the isolation chamber is purged with dry air, the nitrogen generator starts, the electrically operated shut-off damper on the supply air duct is closed, and the electrically operated shut-off damper on the exhaust air duct is open. When the dew point sensor on the exhaust air duct detects that the air dew point is ≤-40°C, the drying of the isolation chamber is complete, and the electrically operated shut-off damper on the exhaust air duct closes, maintaining the dry air state of the isolation chamber. When the dew point sensor on the exhaust air duct detects that the air dew point is >-35°C, the nitrogen generator 12 is restarted. At this time, the electrically operated shut-off damper on the exhaust air duct opens, continuously supplying dry air to the isolation chamber until the dew point sensor on the exhaust air duct detects that the air dew point is ≤-40°C again, at which point the nitrogen generator and the electrically operated shut-off damper on the exhaust air duct are turned off.

[0016] 2. The nitrogen generator produces dry nitrogen gas with a dew point below -40°C. Nitrogen gas is supplied through the nitrogen pipeline to inertate and replace the ammonia fuel double-ear tank. It can also be used to purge and inertate the liquid supply and return gas pipelines, requiring the oxygen content within the pipelines to be below 2%.

[0017] 3. When an ammonia leak occurs in the isolation chamber, the ammonia concentration gas sensor detects an ammonia concentration of 150 ppm, triggering an audible and visual alarm. When multiple ammonia concentration gas sensors detect an ammonia concentration of 300 ppm, the water spray system activates to absorb the ammonia and prevent further leakage. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the internal structure of an ammonia fuel dual-ear tank ship provided for an embodiment of this utility model.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Dual-ear fuel tank; 2. Saddle; 3. Sewage well; 4. Refueling station; 5. Liquid supply pipeline; 6. Gas return pipeline; 7. Nitrogen pipeline; 8. Water spray pipeline; 9. Blower; 10. Ventilation duct; 11. Hull; 12. Dome; 13. Equipment room; 14. Nitrogen generator; 15. Dry air pipeline; 16. Dew point sensor; 17. Bulch pump; 18. Liquid level alarm; 19. Ammonia concentration gas sensor; 20. Audible and visual alarm; 21. Air supply pipeline; 22. Exhaust pipeline; 23. Deck; 24. Isolation compartment. Detailed Implementation

[0022] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0026] Reference Figure 1As an embodiment of this utility model, an ammonia-fueled dual-ear tanker vessel includes a hull 11, a deck 23, a saddle 2, and a dual-ear fuel tank 1. The deck 23 is located on top of the hull 11, and the hull 11 and the deck 23 enclose an isolation compartment 24. The saddle 2 and the dual-ear fuel tank 1 are located within the isolation compartment 24. The saddle 2 is fixed to the hull 11, and the dual-ear fuel tank 1 is mounted on the saddle 2. The ammonia-fueled dual-ear tanker vessel also includes a nitrogen generator 14, which has a pre-compressor and a drying unit inside. The generator 14 supplies dry air to the isolation chamber 24 through the dry air pipeline 15. The isolation chamber 24 is connected to an air supply pipeline 21 on one side and an exhaust pipeline 22 on the other side. Dew point sensors 16 are installed on the dry air pipeline 15, the air supply pipeline 21 and the exhaust pipeline 22. The nitrogen generator 14 is located between the air supply pipeline 21 and the exhaust pipeline 22. Both the air supply pipeline 21 and the exhaust pipeline 22 are equipped with electric shut-off valves. The nitrogen generator 14 performs inerting replacement on the dual-ear fuel tank 1 through the nitrogen pipeline 7.

[0027] Under normal pressure, the dew point sensor 16 is set to a dew point ≤ -40℃. When the isolation chamber 24 is purged with dry air, the nitrogen generator 14 starts, the electrically operated shut-off damper on the supply air duct 21 is closed, and the electrically operated shut-off damper on the exhaust air duct 22 is open. When the dew point sensor 16 on the exhaust air duct 22 detects that the air dew point is ≤ -40℃, the drying of the isolation chamber 24 is complete, and the electrically operated shut-off damper on the exhaust air duct 22 closes, maintaining the dry air state of the isolation chamber 24. When the dew point sensor 16 on the exhaust air duct 22 detects that the air dew point is > -35℃, the nitrogen generator 14 is restarted. At this time, the electrically operated shut-off damper on the exhaust air duct 22 opens, continuously supplying dry air to the isolation chamber 24 until the dew point sensor 16 on the exhaust air duct 22 detects that the air dew point is ≤ -40℃ again, at which point the nitrogen generator 14 and the electrically operated shut-off damper on the exhaust air duct 22 are closed.

[0028] Specifically, the saddle 2 is always fixed to the hull 11, and the twin-ear fuel tank 1 is installed on the saddle 2. A refueling station 4 is arranged on each of the port and starboard sides of the deck 23 to refuel the twin-ear fuel tank 1. The twin-ear fuel tank 1 is topped with a dome 12. The refueling station 4 is connected to the dome 12 via a liquid supply line 5. The evaporated gas inside the twin-ear fuel tank 1 passes through the dome 12 and returns to the refueling station 4 via a return gas line 6. Air supply and exhaust are achieved via ventilation ducts 10 and / or blowers 9 on both the air supply line 21 and the exhaust line 22. A nitrogen line 7 is connected to the liquid supply line and the return gas line 6, and purges and inertes both lines. A nitrogen generator 14 produces dry nitrogen with a dew point below -40°C, which is supplied via the nitrogen line 7 to inertate and replace the ammonia fuel twin-ear tank. The liquid supply line 5 and the return gas line 6 can also be purged and inerted, requiring the oxygen content in the lines to be less than 2%. An equipment room 13 is located on the deck 23, and the nitrogen generator 14 is located in the equipment room 13 for easy operation and debugging.

[0029] Furthermore, the isolation chamber 24 is equipped with an ammonia concentration gas sensor 19 and an audible and visual alarm 20. The ammonia concentration gas sensor 19 is electrically connected to the audible and visual alarm 20. When the ammonia concentration gas sensor 19 detects that the ammonia concentration has reached the first threshold, the audible and visual alarm 20 will start to sound an alarm.

[0030] Specifically, when ammonia leaks into the isolation chamber 24, the ammonia concentration gas sensor 19 detects that the ammonia concentration has reached the first threshold of 150 ppm, and the audible and visual alarm 20 activates to provide a warning. There are at least two ammonia concentration gas sensors 19. A water spray pipe 8 is connected inside the isolation chamber 24. When multiple ammonia concentration gas sensors 19 detect that the ammonia concentration has reached the second threshold, the water spray pipe 8 is activated and sprays water into the isolation chamber 24. In this embodiment, the second threshold is greater than the first threshold, and the second threshold is 300 ppm. When multiple ammonia concentration gas sensors 19 detect that the ammonia concentration has reached 300 ppm, the water spray pipe 8 is activated to absorb the ammonia through spraying, preventing leakage. After being sprayed, the ammonia can be absorbed by the water mist, forming an ammonia-water solution.

[0031] A sump well 3 is located at the bottom of the saddle 2. The sump well 3 collects ammonia solution and contains a bilge pump 17, which discharges the ammonia solution overboard. A level alarm 18 is installed in the sump well 3 to detect any leakage of the ammonia solution. If a leak is detected, a water spray system 8 can be activated to dilute the ammonia solution in the sump well 3, reducing its concentration and preventing corrosion caused by high-concentration ammonia.

[0032] When the isolation chamber 24 needs to be entered for maintenance, the air supply duct 21 and exhaust duct 22 are activated first. The electrically operated shut-off valves on both ducts 21 and 22 are opened, and mechanical ventilation is provided through the air duct 10 and the blower 9 to supply fresh air for entering the confined space. After maintenance is completed, the nitrogen generator 14 supplies dry air to the isolation chamber 24 through the dry air duct 15. This effectively prevents humid air from entering the chamber and causing safety hazards to the gas storage tank.

[0033] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A vessel with ammonia fuel double-eared tanks, comprising a hull (11), a deck (23), a saddle (2), and double-eared fuel tanks (1), wherein the deck (23) is located on top of the hull (11), the hull (11) and the deck (23) enclose an isolation compartment (24), the saddle (2) and the double-eared fuel tanks (1) are located within the isolation compartment (24), the saddle (2) is fixed to the hull (11), and the double-eared fuel tanks (1) are mounted on the saddle (2), characterized in that, It also includes a nitrogen generator (14), which has an air compressor and a drying unit inside. The nitrogen generator (14) supplies dry air to the isolation chamber (24) through a dry air pipeline (15). The isolation chamber (24) is connected to an air supply pipeline (21) on one side and an exhaust pipeline (22) on the other side. Dew point sensors (16) are installed on the dry air pipeline (15), the air supply pipeline (21) and the exhaust pipeline (22). The nitrogen generator (14) is located between the air supply pipeline (21) and the exhaust pipeline (22). Both the air supply pipeline (21) and the exhaust pipeline (22) are equipped with electric shut-off valves. The nitrogen generator (14) performs inerting replacement on the dual-ear fuel tank (1) through the nitrogen pipeline (7).

2. The ammonia fuel double-eared tanker ship as described in claim 1, characterized in that, A refueling station (4) is arranged on each of the port and starboard sides of the deck (23). The top of the double-eared fuel tank (1) is provided with a dome (12). The refueling station (4) is connected to the dome (12) via a liquid supply pipeline (5). The evaporated gas in the double-eared fuel tank (1) passes through the dome (12) and returns to the refueling station (4) through the return gas pipeline (6).

3. The ammonia fuel double-eared tanker ship as described in claim 2, characterized in that, The nitrogen pipeline (7) is connected to the liquid supply pipeline and the return gas pipeline (6), and purging and inerting the two pipelines are performed.

4. The ammonia fuel double-eared tanker ship as described in claim 1, characterized in that, The isolation chamber (24) is equipped with an ammonia concentration gas sensor (19) and an audible and visual alarm (20). The ammonia concentration gas sensor (19) is electrically connected to the audible and visual alarm (20). When the ammonia concentration gas sensor (19) detects that the ammonia concentration has reached the first threshold, the audible and visual alarm (20) will start to sound an alarm.

5. The ammonia fuel double-eared tanker ship as described in claim 4, characterized in that, There are at least two ammonia concentration gas sensors (19), and a water spray pipe (8) is connected inside the isolation chamber (24). When multiple ammonia concentration gas sensors (19) detect that the ammonia concentration has reached the second threshold, the water spray pipe (8) is activated and sprays water into the isolation chamber (24).

6. The ammonia fuel double-eared tanker vessel as described in claim 5, characterized in that, The bottom of the saddle (2) is provided with a sewage well (3), which collects ammonia solution. The sewage well (3) is equipped with a bilge pump (17) which can discharge the ammonia solution to the outside of the ship.

7. The ammonia fuel double-eared tanker ship as described in claim 6, characterized in that, The sewage well (3) is equipped with a liquid level alarm (18), which is used to detect whether the ammonia solution in the sewage well (3) is leaking.

8. The ammonia fuel double-eared tanker ship as described in claim 1, characterized in that, An equipment room (13) is provided on the deck (23), and the nitrogen generator (14) is located in the equipment room (13).

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