Nitrogen supply system for ship

Abstract

The utility model belongs to a marine nitrogen supply system in the technical field of ship parts. A first air compressor (1) and a second air compressor (2) are respectively communicated with a first compressed air storage tank (3), the first air compressor (1) and the second air compressor (2) are respectively communicated with a first molecular sieve (4), the first molecular sieve (4) is communicated with a first nitrogen storage tank (5), and the first nitrogen storage tank (5) is respectively communicated with a main machine, a generator starting system (6) and a tail gas catalytic treatment system (7). And the third air compressor (8) is communicated with a second compressed air storage tank (9), the third air compressor (8) is communicated with a second molecular sieve (10), and the second molecular sieve (10) is communicated with a second nitrogen storage tank (11). According to the nitrogen supply system for the ship, the structure is simplified, an air compressor, pipelines and valves are saved, space arrangement is saved, cost is reduced, and safety, practicability and economical efficiency are improved.

Description

Technical Field

[0001] This utility model belongs to the field of marine component technology, and more specifically, it relates to a marine nitrogen supply system. Background Technology

[0002] Oil tankers require a nitrogen system to protect cargo, inertate oil tanks, control fire risks, and support the operation of other equipment on board. Marine compressed air systems primarily provide compressed air for starting main engines and generators, SCR systems (diesel exhaust catalytic converters), pneumatic control systems, and daily purging. Current oil tankers typically have 3-4 nitrogen air compressors, 2 main air compressors, 1 daily air compressor, 1 emergency air compressor, and 1 SCR air compressor. This results in more than 10 air compressors of at least 5 different types, a large number and variety. Each compressor requires cooling water pipes, vent pipes, hoses, etc., leading to numerous piping systems and accessories. Each type of air compressor is also an independent system, requiring multiple air dryers: 1 control air dryer, 1 SCR air dryer, and 3 nitrogen air dryers. The compressed air systems are independent, cannot be mutually redundant, are economical, difficult to arrange, and have high implementation costs.

[0003] Existing technology includes a nitrogen system and vessel for ships, published under publication number CN113291412B. This technology discloses a nitrogen system and vessel for ships, comprising a gas source device and piping assembly capable of providing nitrogen. The piping assembly includes a first pipe and a second pipe, one end of which is connected to the gas source device. A first branch pipe, a second branch pipe, and a third branch pipe are connected in parallel on the second pipe. The other end of the first pipe is connected to a cargo oil tank, enabling it to provide inerting gas to the cargo oil tank at a first preset pressure. The first branch pipe is connected to a methanol day tank, enabling it to provide gas to the methanol day tank at a second preset pressure. The second branch pipe can purge the methanol supply unit and the methanol main engine unit at a third preset pressure. The third branch pipe can purge the methanol dual-fuel main engine at a fourth preset pressure. The vessel described herein includes the aforementioned nitrogen system for ships. The nitrogen system and vessel for ships of this invention can simultaneously be used for cargo oil tank inerting and gas replenishment, methanol system replenishment and purging, and methanol dual-fuel main engine purging. However, this technology does not address the technical issues and solutions of this application. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a marine nitrogen supply system that simplifies the structure, saves air compressors, pipelines and valves, saves space, reduces costs, realizes backup functions, and improves safety, practicality and economy, in order to address the shortcomings of the existing technology.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] This utility model relates to a marine nitrogen supply system. A first air compressor and a second air compressor are respectively connected to a first compressed air storage tank. The first air compressor and the second air compressor are respectively connected to a first molecular sieve. The first molecular sieve is connected to a first nitrogen storage tank. The first nitrogen storage tank is respectively connected to the main engine, the generator starting system, and the exhaust gas catalytic treatment system. A third air compressor is connected to the second compressed air storage tank. The third air compressor is connected to the second molecular sieve. The second molecular sieve is connected to the second nitrogen storage tank. The second nitrogen storage tank is connected to the daily compressed gas system and the starting control system.

[0007] The first molecular sieve is connected to the first air dryer, and the first air dryer is connected to the first compressed air storage tank.

[0008] The second molecular sieve is connected to the second air dryer, and the second air dryer is connected to the second compressed air storage tank.

[0009] The first nitrogen storage tank is connected to the main unit and generator starting system via a first supply pipeline, and the first nitrogen storage tank is connected to the exhaust gas catalytic treatment system via a second supply pipeline.

[0010] The second nitrogen storage tank is connected to the daily compressed gas system via a third supply pipeline, and the second nitrogen storage tank is connected to the start-up control system via a fourth supply pipeline.

[0011] An on / off valve is provided between the first air compressor and the first molecular sieve, and an on / off valve is provided between the second air compressor and the first molecular sieve.

[0012] Pressure sensors and flow meters are installed on the first compressed air storage tank, the first nitrogen storage tank, the first supply pipeline, and the second supply pipeline.

[0013] Pressure sensors and flow meters are installed on the second compressed air storage tank, the second nitrogen storage tank, the third supply pipeline, and the fourth supply pipeline.

[0014] The first nitrogen storage tank is also connected to the emergency system via a branch pipe.

[0015] The working principle and beneficial effects of this utility model are as follows:

[0016] The improved marine nitrogen supply system of this utility model integrates the ship's nitrogen supply system with a nitrogen system used for protecting cargo, inerting oil tanks, controlling fire risks, and supporting the operation of other equipment on board. Specifically, a first air compressor and a second air compressor are respectively connected to a first compressed air storage tank. One air compressor is the primary compressor, and the other is a standby compressor. The primary compressor is used during operation, and the standby compressor is used when the primary compressor fails, thus ensuring that air intake and delivery are always normal. The first and second air compressors are respectively connected to a first molecular sieve. The first molecular sieve processes the components in the air, retaining nitrogen while filtering out other components. The nitrogen passing through the first molecular sieve is then transported to a first nitrogen storage tank for storage. The first nitrogen storage tank is connected to the main engine, generator starting system, and exhaust gas catalytic treatment system. Therefore, the generation, storage, and supply of nitrogen to the main engine, generator starting system, and exhaust gas catalytic treatment system can be achieved through the operation of either the first or second air compressor and the first molecular sieve. Meanwhile, a third air compressor is connected to a second compressed air storage tank. The third air compressor ensures normal air intake and delivery at all times. It is also connected to a second molecular sieve, which processes the air components, retaining nitrogen while filtering out other components. The nitrogen passing through the second molecular sieve is then transported to a second nitrogen storage tank. This second molecular sieve is connected to the second nitrogen storage tank, which in turn is connected to the daily compressed gas system and the start-up control system. Thus, the operation of the third air compressor and the second molecular sieve enables the generation and storage of another source of nitrogen, as well as the supply of nitrogen to the daily compressed gas system and the start-up control system. In this way, the entire ship's nitrogen system is integrated into one unit, eliminating the need for separate air compressors, molecular sieves, pipelines, and other components. The marine nitrogen supply system described in this invention simplifies the structure, saves on air compressors, pipelines, and valves, saves space, reduces costs, provides backup functionality, and improves safety, practicality, and economy. Attached Figure Description

[0017] The following is a brief explanation of the contents depicted in the accompanying drawings and the markings therein:

[0018] Figure 1 This is a schematic diagram of the marine nitrogen supply system described in this utility model;

[0019] The labels in the attached diagram are as follows: 1. First air compressor; 2. Second air compressor; 3. First compressed air storage tank; 4. First molecular sieve; 5. First nitrogen storage tank; 6. Main unit and generator starting system; 7. Exhaust gas catalytic treatment system; 8. Third air compressor; 9. Second compressed air storage tank; 10. Second molecular sieve; 11. Second nitrogen storage tank; 12. Daily compressed gas system; 13. Start-up control system; 14. First air dryer; 15. Second air dryer; 16. First supply pipeline; 17. Second supply pipeline; 18. Third supply pipeline; 19. Fourth supply pipeline; 20. Branch pipe; 21. Emergency system. Detailed Implementation

[0020] The following description, with reference to the accompanying drawings, provides a more detailed explanation of the specific embodiments of this utility model, including the shape and structure of each component, the relative positions and connections between the parts, the functions and working principles of each part:

[0021] As attached Figure 1As shown, this utility model is a marine nitrogen supply system. A first air compressor 1 and a second air compressor 2 are respectively connected to a first compressed air storage tank 3. The first air compressor 1 and the second air compressor 2 are respectively connected to a first molecular sieve 4. The first molecular sieve 4 is connected to a first nitrogen storage tank 5. The first nitrogen storage tank 5 is respectively connected to the main engine, generator starting system 6, and exhaust gas catalytic treatment system 7. A third air compressor 8 is connected to a second compressed air storage tank 9. The third air compressor 8 is connected to a second molecular sieve 10. The second molecular sieve 10 is connected to a second nitrogen storage tank 11. The second nitrogen storage tank 11 is connected to a daily compressed gas system 12 and a starting control system 13. To address the shortcomings of the prior art, this invention proposes an improved technical solution. The improvement involves integrating the ship's nitrogen supply system with a nitrogen system used for protecting cargo, inerting oil tanks, controlling fire risks, and supporting the operation of other equipment on board. Specifically, the first air compressor 1 and the second air compressor 2 are respectively connected to the first compressed air storage tank 3. The first air compressor 1 is the main air compressor, and the second air compressor 2 is the standby air compressor. During operation, the main air compressor is primarily used, and the standby air compressor is used when the main air compressor fails, thus ensuring that air intake and delivery are always normal. The first air compressor 1 and the second air compressor 2 are respectively connected to the first molecular sieve 4. The first molecular sieve 4 is used to process the components in the air, retaining nitrogen while filtering out other components. The nitrogen passing through the first molecular sieve 4 is then transported to the first nitrogen storage tank 5 for storage. The first nitrogen storage tank 5 is connected to the main unit, the generator starting system 6, and the exhaust gas catalytic treatment system 7. Therefore, the generation and storage of nitrogen, as well as the supply of nitrogen to the main unit, the generator starting system 6, and the exhaust gas catalytic treatment system 7, can be achieved through the operation of the first air compressor 1 or the second air compressor 2 and the first molecular sieve 4. Meanwhile, the third air compressor 8 is connected to the second compressed air storage tank 9. The third air compressor 8 ensures that air intake and delivery are always normal. The third air compressor 8 is also connected to the second molecular sieve 10, which processes the components in the air, retaining nitrogen while filtering out other components. The nitrogen passing through the second molecular sieve 10 is then transported to the second nitrogen storage tank 11 for storage. The second molecular sieve 10 is connected to the second nitrogen storage tank 11, which in turn is connected to the daily compressed gas system 12 and the start-up control system 13. Thus, the operation of the third air compressor and the second molecular sieve enables the generation and storage of another source of nitrogen, as well as the supply of nitrogen to the daily compressed gas system 12 and the start-up control system 13. In this way, the entire ship's nitrogen system is integrated into one unit, eliminating the need for numerous air compressors, molecular sieves, pipelines, and other components. The marine nitrogen supply system described in this invention simplifies the structure, saves on air compressors, pipelines, and valves, saves space, reduces costs, provides backup functionality, and improves safety, practicality, and economy.

[0022] The first molecular sieve 4 is connected to the first air dryer 14, and the first air dryer 14 is connected to the first compressed air storage tank 3. In the above structure, the first air dryer 14 dries the nitrogen gas generated by the first molecular sieve, and then inputs it into the first nitrogen storage tank 5 for storage.

[0023] The second molecular sieve 10 is connected to a second air dryer 15, and the second air dryer 15 is connected to a second compressed air storage tank 9. In this configuration, the second air dryer 15 dries the nitrogen gas generated by the second molecular sieve, and then stores it in the second nitrogen storage tank 9.

[0024] The first nitrogen storage tank 5 is connected to the main unit and generator starting system 6 via a first supply pipeline 16, and to the exhaust gas catalytic treatment system 7 via a second supply pipeline 17. In this structure, the first nitrogen storage tank 5 supplies nitrogen to the main unit, generator starting system 6, and exhaust gas catalytic treatment system 7. Opening and closing valves are installed on the pipelines connecting the first nitrogen storage tank 5 to these systems; these valves are solenoid valves, controlled by a control component to reliably control the flow of nitrogen according to the actual needs of different systems.

[0025] The second nitrogen storage tank 11 is connected to the daily compressed gas system 12 via a third supply pipeline 18, and to the start-up control system 13 via a fourth supply pipeline 19. In this structure, the second nitrogen storage tank 9 supplies nitrogen to both the daily compressed gas system 12 and the start-up control system 13. Opening and closing valves, which are solenoid valves, are installed on the supply pipelines connecting the second nitrogen storage tank 9 to the daily compressed gas system 12 and the start-up control system 13. These valves are controlled by a control component to reliably control the flow of nitrogen according to the actual needs of different systems, thus meeting the nitrogen supply requirements.

[0026] An on / off valve is provided between the first air compressor 1 and the first molecular sieve 4, and an on / off valve is provided between the second air compressor 2 and the first molecular sieve 4. With this structure, only one of the first and second air compressors needs to operate at any given time. Therefore, the on / off valve of the operating air compressor is open, and the on / off valve of the non-operating air compressor is closed, achieving one operating and one standby.

[0027] Pressure sensors and flow meters are installed on the first compressed air storage tank 3, the first nitrogen storage tank 5, the first supply pipeline 16, and the second supply pipeline 17. In this structure, the pressure sensors measure pressure, and the flow meters measure flow rate, enabling monitoring of the pressure and flow rate of each component.

[0028] Pressure sensors and flow meters are installed on the second compressed air storage tank 9, the second nitrogen storage tank 11, the third supply pipeline 18, and the fourth supply pipeline 20. In this structure, the pressure sensors measure pressure, and the flow meters measure flow rate, enabling monitoring of the pressure and flow rate of each component.

[0029] The first nitrogen storage tank 5 is also connected to the emergency system 21 via a branch pipe 20. This structure, according to actual needs, can simultaneously meet the nitrogen supply requirements of the emergency system 21. An on / off valve, which is a solenoid valve, is installed on the branch pipe 20. Its opening and closing is controlled by a control component, reliably realizing the on / off of the nitrogen pipeline according to the actual needs of different systems, thus meeting the requirements.

[0030] The marine nitrogen supply system described in this utility model integrates the ship's nitrogen supply system with a nitrogen system used for protecting cargo, inerting oil tanks, controlling fire risks, and supporting the operation of other equipment on board. The first air compressor 1 and the second air compressor 2 are respectively connected to the first compressed air storage tank 3. One air compressor 1 is the main air compressor, and the other is a standby air compressor. During operation, the main air compressor is primarily used, and the standby air compressor is used when the main air compressor fails, thus ensuring that air intake and delivery are always normal. The first air compressor 1 and the second air compressor 2 are respectively connected to the first molecular sieve 4. The first molecular sieve 4 is used to process the components in the air, that is, to retain nitrogen and sieve out other components in the air, so that the nitrogen passing through the first molecular sieve 4 is transported to the first nitrogen storage tank 5 for storage. The first nitrogen storage tank 5 is respectively connected to the main unit, the generator starting system 6 and the exhaust gas catalytic treatment system 7. That is, the generation and storage of nitrogen, as well as the supply of nitrogen to the main unit, the generator starting system 6 and the exhaust gas catalytic treatment system 7, can be realized through the operation of the first air compressor 1 or the second air compressor 2 and the first molecular sieve 4. Meanwhile, the third air compressor 8 is connected to the second compressed air storage tank 9. The third air compressor 8 ensures that air intake and delivery are always normal. The third air compressor 8 is also connected to the second molecular sieve 10, which processes the components in the air, retaining nitrogen while filtering out other components. The nitrogen passing through the second molecular sieve 10 is then transported to the second nitrogen storage tank 11 for storage. The second molecular sieve 10 is connected to the second nitrogen storage tank 11, which in turn is connected to the daily compressed gas system 12 and the start-up control system 13. Thus, the operation of the third air compressor and the second molecular sieve enables the generation and storage of another source of nitrogen, as well as the supply of nitrogen to the daily compressed gas system 12 and the start-up control system 13. In this way, the entire ship's nitrogen system is integrated into one unit, eliminating the need for separate air compressors, molecular sieves, pipelines, and other components. The marine nitrogen supply system described in this invention simplifies the structure, saves on air compressors, pipelines, and valves, saves space, reduces costs, provides backup functionality, and improves safety, practicality, and economy.

[0031] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A marine nitrogen supply system, characterized in that: The first air compressor (1) and the second air compressor (2) are respectively connected to the first compressed air storage tank (3), the first air compressor (1) and the second air compressor (2) are respectively connected to the first molecular sieve (4), the first molecular sieve (4) is connected to the first nitrogen storage tank (5), the first nitrogen storage tank (5) is respectively connected to the main unit, the generator starting system (6) and the tail gas catalytic treatment system (7), the third air compressor (8) is connected to the second compressed air storage tank (9), the third air compressor (8) is connected to the second molecular sieve (10), the second molecular sieve (10) is connected to the second nitrogen storage tank (11), the second nitrogen storage tank (11) is connected to the daily compressed gas system (12) and the starting control system (13).

2. The marine nitrogen supply system according to claim 1, characterized in that: The first molecular sieve (4) is connected to the first air dryer (14), and the first air dryer (14) is connected to the first compressed air storage tank (3).

3. The marine nitrogen supply system according to claim 1 or 2, characterized in that: The second molecular sieve (10) is connected to the second air dryer (15), and the second air dryer (15) is connected to the second compressed air storage tank (9).

4. The marine nitrogen supply system according to claim 1 or 2, characterized in that: The first nitrogen storage tank (5) is connected to the main unit and generator starting system (6) through the first supply pipeline (16), and the first nitrogen storage tank (5) is connected to the exhaust gas catalytic treatment system (7) through the second supply pipeline (17).

5. The marine nitrogen supply system according to claim 3, characterized in that: The second nitrogen storage tank (11) is connected to the daily compressed gas system (12) through the third supply pipeline (18), and the second nitrogen storage tank (11) is connected to the start control system (13) through the fourth supply pipeline (19).

6. The marine nitrogen supply system according to claim 1 or 2, characterized in that: An on / off valve is provided between the first air compressor (1) and the first molecular sieve (4), and an on / off valve is provided between the second air compressor (2) and the first molecular sieve (4).

7. The marine nitrogen supply system according to claim 4, characterized in that: Pressure sensors and flow meters are installed on the first compressed air storage tank (3), the first nitrogen storage tank (5), the first supply pipeline (16), and the second supply pipeline (17).

8. The marine nitrogen supply system according to claim 5, characterized in that: Pressure sensors and flow meters are installed on the second compressed air storage tank (9), the second nitrogen storage tank (11), the third supply pipeline (18), and the fourth supply pipeline (20).

9. The marine nitrogen supply system according to claim 1 or 2, characterized in that: The first nitrogen storage tank (5) is also connected to the emergency system (21) via a branch pipe (20).

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