A heavy fuel oil tank venting system

Abstract

The application discloses a kind of heavy fuel oil cabin ventilation systems, fuel daily use cabin and fuel sedimentation cabin are located below deck, fuel daily use cabin and fuel sedimentation cabin top respectively extend with daily use cabin ventilation pipe and sedimentation cabin ventilation pipe, daily use cabin ventilation pipe and sedimentation cabin ventilation pipe are connected with ventilation main pipe.Ventilation main pipe is inclined to horizontal plane, and the end connected with oil mist tank is higher, and the end connected with fuel storage cabin is lower, overflow pipe and check valve are sequentially arranged at the connection of ventilation main pipe and fuel storage cabin, and overflow pipe is provided with overflow pipe oil seal.The lowest point of overflow pipe oil seal is provided with oil seal injection point, and the oil seal injection point is connected with oil seal injection pipe.The application effectively reduces the structural strength requirement of fuel storage cabin, sedimentation cabin and overflow cabin, can greatly reduce the structure purchase and cost, reduce total ship weight, reduce cost, is beneficial to the arrangement of surrounding equipment and pipeline, and the condensate and waste oil in ventilation main pipe cannot flow back into fuel daily use cabin and sedimentation cabin, to ensure oil product clean.

Description

Technical Field

[0001] This invention belongs to the field of shipbuilding and design, and specifically relates to a heavy fuel oil tank ventilation system. Background Technology

[0002] The fuel settling tanks and fuel day tanks store heavy fuel oil (HFO), which often needs to be heated to 90°C during routine use. This generates a large amount of fuel vapor, which escapes through the vent pipes from the air intake. On the one hand, the fuel vapor has a strong odor and can easily enter rooms or be sucked into the engine room by the naval fans and blown back into the engine room. On the other hand, this fuel vapor also poses a certain hazard and should be kept away from areas with frequent personnel activity. Therefore, the vent pipes of the fuel settling tanks and fuel day tanks often need to extend to the D-deck of the funnel, reaching a considerable height, as shown in the diagram below.

[0003] However, according to the design requirements of the tank structure, the structural strength of the tank needs to meet the highest point height that the liquid level can reach. Generally speaking, the higher the air head, the stronger the tank structure needs to be, the greater the requirements for the tank structure and plate thickness, the greater the design difficulty, the heavier the weight, and the greater the cost. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a heavy-duty fuel tank ventilation system, aiming to reduce the impact on the tank structure and lower design complexity and cost. The technical solution adopted is as follows: A heavy fuel oil tank ventilation system includes a fuel oil day tank and a fuel oil settling tank located below the deck. Ventilation pipes for the day tank and the settling tank extend from the top of the day tank and the settling tank, respectively, and are connected to a main ventilation pipe.

[0005] The vent main is inclined relative to the horizontal plane, with the end connected to the oil mist box being higher and the end connected to the fuel storage tank being lower. An overflow pipe and a check valve are installed in sequence at the connection between the vent main and the fuel storage tank, and the overflow pipe is equipped with an overflow pipe oil seal.

[0006] An oil seal injection point is set at the lowest point of the overflow pipe oil seal, and an oil seal injection pipe is connected to the oil seal injection point.

[0007] Furthermore, in the aforementioned heavy fuel oil compartment ventilation system, an oil seal injection valve is installed on the oil seal injection pipe.

[0008] Furthermore, in the aforementioned heavy fuel oil compartment ventilation system, the oil mist box is located above the deck.

[0009] Furthermore, in the aforementioned heavy fuel oil compartment venting system, the end of the venting manifold located inside the oil mist box is a gooseneck pipe.

[0010] Furthermore, in the aforementioned heavy fuel oil compartment ventilation system, a vent pipe is connected to the lower end of the vent main, and the vent pipe is equipped with a vent water seal.

[0011] Furthermore, in the aforementioned heavy fuel oil tank ventilation system, the fuel oil storage tank is located below the deck, with a storage tank vent pipe extending from the top. The storage tank vent pipe extends upward to the top of the deck and connects to the storage tank air head.

[0012] To reduce the structural weight of the fuel settling tank and the fuel day tank, it is necessary to reduce the height of the highest point that the liquid level in these two tanks can reach.

[0013] An overflow pipe is added to the vent main, effectively reducing the maximum liquid level in the tank and lowering the structural strength requirements. The overflow pipe extends to the bottom of the fuel oil storage tank, preventing fuel vapors from flowing from the fuel oil settling tank and day use tank into the storage tank. A check valve is added to the overflow pipe to prevent fuel oil from the fuel oil storage tank from flowing back into the fuel oil day use tank. The maximum liquid level in the fuel oil day use tank can be lowered from the D deck to the main deck, effectively reducing the structural strength requirements of the tank.

[0014] The beneficial effects of this invention are: 1. It effectively reduces the structural strength requirements of fuel storage tanks, sedimentation tanks, and overflow tanks, which can greatly reduce structural procurement and costs, reduce the total ship weight, and lower costs.

[0015] 2. The reduced size of the compartment structure facilitates the layout of surrounding equipment and pipelines.

[0016] 3. It offers greater flexibility and a simpler principle, allowing for different layout options depending on the number and location of the containers. Attached Figure Description

[0017] Figure 1 This is a system schematic diagram of the present invention. Detailed Implementation

[0018] The invention will be further described with reference to the accompanying drawings.

[0019] A heavy fuel oil tank venting system requires reducing the height of the highest point that the liquid level in the fuel oil settling tank and the fuel oil day tank can reach in order to reduce the structural weight of the fuel oil settling tank and the fuel oil day tank.

[0020] As shown in the figure below, the daytime vent pipe 2 of the fuel oil daytime tank 1 and the settling tank vent pipe 3 of the fuel oil settling tank 4 are interconnected with the main vent pipe 5, which extends upwards to the oil mist box 6 on the D deck. A gooseneck pipe 8 is provided at the upper end of the main vent pipe 5, and louvers 7 are provided on the side of the oil mist box 6.

[0021] During normal operation, the fuel gas 21 in the day fuel tank 1 and the fuel gas 22 in the settling tank 4 will enter the main vent pipe 5 upwards through the day fuel tank vent pipe 2 and the settling tank vent pipe 3, respectively. The fuel gas continues to rise, and through the gooseneck pipe 8 at the end of the main vent pipe 5, the fuel gas will enter the oil mist box 6, and then be discharged into the outdoor air through the louvers 7, completing the venting process.

[0022] The connection point between the day-use compartment vent pipe 2 and the sedimentation compartment vent pipe 3 of the present invention and the main vent pipe 5 is at the upper part of the main vent pipe 5, which can prevent waste oil or rainwater inside the main vent pipe 5 from flowing back into the fuel oil day-use compartment 1 and the fuel oil sedimentation compartment 4, and prevent fuel oil from being contaminated.

[0023] A vent pipe 20 is installed at the end of the vent main 5. When waste oil or rainwater is generated inside the vent main 5, it can be vented through this vent pipe 20 to further prevent it from flowing back into the fuel day tank 1 and the fuel sedimentation tank 4, thus preventing fuel contamination.

[0024] A water seal 19 is provided on the vent pipe 20 to effectively prevent the oil and gas from flowing out through the vent pipe 20 and ensure that the oil and gas can only flow into the oil mist box 6.

[0025] In this invention, an overflow pipe 10 is added to the main vent pipe 5, which injects fuel into the fuel storage tank 18 through a check valve 11 and an overflow pipe injection end 12. The fuel storage tank vent pipe 13 of the fuel storage tank 18 extends upward to the main deck, and a storage tank air head 14 is installed at the end.

[0026] When fuel oil day tank 1 and fuel oil settling tank 4 experience overload, the fuel oil levels 23 and 24 in the day tank and settling tank will continue to rise, flowing into fuel oil storage tank 18 through overflow pipe 10. If the fuel oil storage tank level 25 in fuel oil storage tank 18 also continues to rise, it will overflow to the main deck through storage tank vent pipe 13 and storage tank air head 14. Therefore, it can be ensured that the highest liquid level in fuel oil day tank 1 and fuel oil settling tank 4 drops from deck D to the main deck, effectively reducing the structural strength requirements of the tanks.

[0027] The overflow pipe 10 of the present invention is provided with a check valve 11, which can prevent fuel in the fuel storage tank 18 from flowing back into the fuel day use tank 1 and the fuel sedimentation tank 4.

[0028] The overflow pipe 10 of the present invention is provided with an overflow pipe oil seal 9, which can prevent oil and gas from flowing from the fuel day use tank 1 and the fuel sedimentation tank 4 into the fuel storage tank 18, but allows the overflowed fuel to flow from the fuel day use tank 1 and the fuel sedimentation tank 4 into the fuel storage tank 18.

[0029] An oil seal injection point 15 is provided at the lowest point of the overflow pipe oil seal 9. Fuel for the oil seal can be injected into the overflow pipe oil seal 9 through the oil seal injection valve 17 and the oil seal injection pipe 16. This ensures the continuous effectiveness of the overflow pipe oil seal 9 and can also be reversed to drain the fuel in the oil seal 9, preventing condensation when not in use for a long time.

Claims

1. A heavy fuel oil compartment ventilation system, characterized in that, There are fuel oil day tanks and fuel oil settling tanks located below the deck. The tops of the fuel oil day tanks and fuel oil settling tanks have vent pipes for the day tanks and vent pipes for the settling tanks, respectively, and the vent pipes for the day tanks and the settling tanks are connected to the main vent pipe. The vent main is inclined relative to the horizontal plane, with the end connected to the oil mist box being higher and the end connected to the fuel storage tank being lower. An overflow pipe and a check valve are installed in sequence at the connection between the vent main and the fuel storage tank. The overflow pipe is equipped with an overflow pipe oil seal. An oil seal injection point is set at the lowest point of the overflow pipe oil seal, and an oil seal injection pipe is connected to the oil seal injection point.

2. The heavy fuel oil compartment ventilation system according to claim 1, characterized in that, An oil seal injection valve is installed on the oil seal injection pipe.

3. The heavy fuel oil compartment ventilation system according to claim 1, characterized in that, The oil mist box is located above the deck.

4. A heavy-duty fuel oil compartment ventilation system according to claim 1, characterized in that, The end of the vent main located inside the oil mist chamber is a gooseneck tube.

5. A heavy-duty fuel oil compartment ventilation system according to claim 1, characterized in that, The lower end of the vent pipe is connected to a drain pipe, which is equipped with a drain water seal.

6. A heavy-duty fuel oil compartment ventilation system according to claim 1, characterized in that, The fuel storage tank is located below the deck, with a storage tank vent pipe extending from the top. The storage tank vent pipe extends upward to the top of the deck and connects to the storage tank air head.

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