Venting system for an LNG carrier

Abstract

The application provides a gas ventilation system of an LNG ship, which comprises an LNG tank, an air feeding pipe, a gas ventilation pipe and a gas ventilation mast; the LNG tank is arranged in a closed space of a ship body; the air feeding pipe feeds external air into the closed space through an air feeder; one end of the gas ventilation pipe is communicated with the closed space, and the other end of the gas ventilation pipe is located above the ship body; and the gas ventilation mast is arranged on the top of the gas ventilation pipe. The gas ventilation pipe directly feeds the gas in the closed space to the gas ventilation mast on the top, which helps to solve the technical problems of unreasonable pipeline arrangement and large space occupation in the prior art.

Description

Technical fields:

[0001] This invention relates to the field of ventilated mast structure design, and in particular to a ventilated system for LNG ships. Background technology:

[0002] Cargo ships and passenger ro-ro ships using LNG fuel are required by regulations to have a vent mast approximately 10 meters above the deck on the top deck. This mast is used to vent gases emitted from the LNG supply system and for ventilation of the gas storage areas. The vents for each safety valve in the LNG system are routed to the top of the vent mast, making it difficult to install more than ten pipelines within the relatively confined space of the mast. The layout of the LNG tank ventilation ducts also needs to be considered, which occupies a significant amount of space.

[0003] There is an urgent need for a venting system for LNG ships, which would help solve the technical problems of unreasonable pipeline layout and large space occupation in existing technologies. Summary of the Invention:

[0004] In one embodiment, the present invention provides a venting system for LNG ships, which directly delivers the gas in the sealed air to the top venting mast through venting pipes, helping to solve the technical problems of unreasonable pipeline layout and large space occupation in the prior art.

[0005] The venting system of the LNG ship includes an LNG tank, an air supply pipe, a venting pipeline, and a venting mast;

[0006] The LNG tank is located in a sealed space within the hull.

[0007] The air supply duct delivers outside air into the enclosed space via a blower.

[0008] One end of the ventilation duct is connected to the sealed space, and the other end of the ventilation duct is located above the hull.

[0009] The ventilation mast is located at the top of the ventilation duct.

[0010] In one embodiment, the venting system of the LNG carrier further includes a blower;

[0011] The exhaust fan is used to extract air from the sealed space through the ventilation pipe.

[0012] In one embodiment, the venting system of the LNG carrier includes a venting pipe channel;

[0013] The ventilated channel is arranged along the ventilated pipe, and the two ends of the ventilated channel are respectively connected to the enclosed space and the top of the ventilated pipe.

[0014] In one embodiment, the venting system of the LNG carrier includes a ventilation duct disposed at the top of the venting duct.

[0015] In one embodiment, the air supply pipe is positioned horizontally on top of the LNG tank.

[0016] In one embodiment, the venting system of the LNG carrier is located in the middle of the hull.

[0017] In one embodiment, a fan fire damper is provided at the bottom of the ventilation duct.

[0018] In one embodiment, the ventilated duct is divided into two sides along the middle, with one side running from top to bottom and the other side running from bottom to top.

[0019] In one embodiment, the LNG carrier is a PCTC ship or a ro-ro passenger ship.

[0020] In one embodiment, the LNG tank is located at the bottom of the ship's hold. Attached image description:

[0021] Figure 1 This is a schematic diagram of the ventilation system of an LNG ship according to one embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the top partial structure of a venting system for an LNG ship according to another embodiment of the present invention.

[0023] Figure 3 This is a schematic diagram of the ventilation system of an LNG carrier on its hull in another embodiment of the present invention;

[0024] Figure 4 This is a partial schematic diagram of the venting system of an LNG carrier on its hull, according to another embodiment of the present invention.

[0025] Figure label:

[0026] LNG tank 1

[0027] Air supply duct 2

[0028] Ventilation channel 3

[0029] Breathable mast 4

[0030] Ventilation duct 5

[0031] Hull 10

[0032] Enclosed Space 101

[0033] Ventilation duct 6

[0034] 7 Fire dampers for fans

[0035] Exhaust fan 8

[0036] blower 20 Detailed implementation method:

[0037] The vents for each safety valve in the LNG system are routed to the top of the vent mast. Arranging more than ten pipelines within the relatively confined space of the mast presents significant space constraints. Furthermore, the layout of the LNG tank's ventilation ducts must also be considered, which occupies considerable space.

[0038] By combining the layout, the blower is placed below the LNG venting pipeline, which is then divided into two sides to serve as the air inlet and outlet channels for the LNG tank. The blower is placed below the LNG venting pipeline and connected to the air inlet and outlet pipelines, saving space and reducing the amount of ductwork.

[0039] The LNG safety valve and other vent pipes converge at the bottom of the venting mast at the top of the channel, making the mast a channel through which gas is discharged, reducing the number of pipes in the mast.

[0040] Figure 1 This is a schematic diagram of the ventilation system of an LNG ship according to one embodiment of the present invention; Figure 2 This is a schematic diagram of the top partial structure of a venting system for an LNG ship according to another embodiment of the present invention. Figure 3 This is a schematic diagram of the ventilation system of an LNG carrier on its hull in another embodiment of the present invention; Figure 4 This is a partial schematic diagram of the venting system on the hull of an LNG carrier according to another embodiment of the present invention. Figures 1 to 4 As shown, in one embodiment, the present invention provides a venting system for an LNG carrier, the venting system for the LNG carrier including an LNG tank 1, an air supply pipe 2, a venting pipe 3, and a venting mast 4;

[0041] LNG tank 1 is located in the enclosed space 101 of the hull 10;

[0042] The air supply duct 2 delivers outside air into the sealed space via the blower 3;

[0043] One end of the ventilation pipe 3 is connected to the enclosed space 101, and the other end of the ventilation pipe 3 is located above the hull.

[0044] The ventilation mast 4 is located at the top of the ventilation duct 3.

[0045] This embodiment provides a specific implementation of a ventilation system for an LNG carrier. The ventilation system uses ductwork channels as ventilation passages for the LNG tank compartments, effectively reducing the need for ductwork layout, saving ductwork materials and installation time, and saving space, resulting in a more rational compartment layout.

[0046] This design approach can reduce the use of large air ducts by about 80 meters and ventilator pipes by about 200 meters of stainless steel pipes, resulting in a reduction of material costs and installation time of about 50,000 yuan, thus bringing economic benefits to the company.

[0047] In one embodiment, the venting system of the LNG carrier further includes a blower 5;

[0048] The exhaust fan 8 is used to extract air from the enclosed space through the ventilation pipe 5.

[0049] In one embodiment, the venting system of the LNG carrier includes a venting pipe channel 5;

[0050] The ventilation channel 3 is set along the ventilation pipe 5, and the two ends of the ventilation channel 3 are respectively connected to the sealed space 101 and the top of the ventilation pipe 5.

[0051] In one embodiment, the venting system of the LNG ship includes a ventilation duct 6 disposed at the top of the venting pipe 5.

[0052] In one embodiment, the air supply pipe 2 is placed horizontally on top of the LNG tank 1.

[0053] In this embodiment, an air supply pipe 2 is provided on the top of an LNG tank 1 to achieve a relatively reasonable layout and to deliver air to the end of the air supply pipe 2 as shown in the figure.

[0054] In one embodiment, the venting system of the LNG carrier is located in the middle of the hull.

[0055] In one embodiment, a fan fire damper 7 is provided at the bottom of the ventilation duct 3.

[0056] In one embodiment, the ventilation duct 3 is divided into two sides along the middle, with one side running from top to bottom and the other side running from bottom to top.

[0057] The LNG venting pipeline is divided into two sections to serve as the air inlet and outlet channels for the LNG tank, saving space and reducing the need for ductwork. The LNG safety valve and other venting pipes converge below the venting mast, and the gas is discharged through the mast body and the vent head at the top, reducing the amount of piping in the mast body.

[0058] In one embodiment, the LNG carrier is a PCTC ship or a ro-ro passenger ship.

[0059] The company's main products are PCTC ships and ro-ro passenger ships, which bring high profits to the company. Most of these ship types use LNG as dual fuel and are also equipped with tanks and vented masts. The application of this patent can effectively reduce the layout of air ducts and improve space utilization, providing ship owners with more usable space, reducing ship weight, increasing the amount of cargo carried, improving ship owners' efficiency, and also helping the company to undertake more orders and improve economic benefits.

[0060] In one embodiment, the LNG tank is located at the bottom of the ship's hold.

Claims

1. A venting system for an LNG carrier, characterized in that, The venting system of the LNG carrier includes: An LNG tank (1) is located in a closed space (101) of the hull (10); An air supply duct (2) supplies outside air into the sealed space (101) via a blower (20). A ventilation duct (5) has one end connected to the sealed space (101) and the other end of the ventilation duct (5) is located above the hull (10). A ventilation mast (4) is installed on top of the ventilation duct (5); The venting system of the LNG ship includes a venting pipe channel (3); The ventilation channel (3) is arranged along the ventilation pipe (5), and the two ends of the ventilation channel (3) are respectively connected to the sealed space (101) and the top of the ventilation pipe (5); The ventilation duct (5) is divided into two sides along the middle, with one side from top to bottom for air intake and the other side from bottom to top for air exhaust.

2. The venting system for LNG carriers according to claim 1, characterized in that, The venting system of the LNG carrier also includes: An exhaust fan (8) is used to extract air from the ventilator (5) in the enclosed space (101).

3. The venting system for LNG carriers according to claim 2, characterized in that, The venting system of the LNG ship includes a ventilation duct (6) which is located on top of the venting pipe (5).

4. The venting system for LNG carriers according to claim 3, characterized in that, The air supply pipe (2) is placed horizontally on top of the LNG tank (1).

5. The venting system for LNG carriers according to claim 4, characterized in that, The venting system of the LNG carrier is located in the middle of the hull.

6. The venting system for LNG carriers according to claim 5, characterized in that, A fan fire damper (7) is installed at the bottom of the ventilation duct.

7. The venting system for LNG carriers according to claim 6, characterized in that, The LNG carriers mentioned are PCTC ships and ro-ro passenger ships.

8. The venting system for LNG carriers according to claim 7, characterized in that, The LNG tank (1) is located at the bottom of the ship's hold.

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