Air supply pipeline structure of ultra-large trailing suction dredger

Abstract

The utility model relates to an air supply pipeline structure of an oversized trailing suction dredger. The air supply pipeline structure comprises a liquid inlet single-wall pipe, a liquid inlet vacuum double-wall pipe, an air return vacuum double-wall pipe and an air return single-wall pipe, the liquid tank is arranged in the LNG storage bin, the liquid inlet vacuum double-wall pipe and the gas return vacuum double-wall pipe are located in the LNG storage bin, the left end of the liquid inlet vacuum double-wall pipe and the left end of the gas return vacuum double-wall pipe are connected with the liquid tank, and the liquid inlet single-wall pipe and the gas return single-wall pipe are arranged on the outer side of the LNG storage bin. The left end of the liquid inlet single-wall pipe is connected with the right end of the liquid inlet vacuum double-wall pipe, and the right end of the liquid inlet single-wall pipe is connected with an LNG filling station. The left end of the gas return single-wall pipe is connected with the right end of the gas return vacuum double-wall pipe, and the right end of the gas return single-wall pipe is connected with the LNG filling station; the air supply pipeline structure of the ultra-large drag suction hopper dredger aims to overcome existing defects, is reasonable in arrangement, and optimizes cost and construction period.

Description

Technical Field

[0001] The utility model relates to an air supply pipeline structure of a super-large trailing suction dredger. Background Art

[0002] LNG (liquefied natural gas) fuel is a new type of clean energy. When used as marine fuel, it can effectively reduce SOx (sulfur oxides), NOx (nitrogen oxides), and CO2 (carbon dioxide) emissions, meet increasingly stringent ship emission regulations, and reduce ship fuel costs and improve ship fuel economy.

[0003] The application of LNG dual-fuel trailing suction hopper dredger fills the gap in the use of clean energy for trailing suction hopper dredgers. Clean energy trailing suction hopper dredgers have obvious energy-saving and emission-reduction benefits. Carbon dioxide emissions are reduced by more than 20% compared with fuel diesel engines, nitrogen oxide emissions are reduced by more than 80%, and sulfur oxide and particulate emissions are reduced by almost 100%.

[0004] In response to the energy conservation and emission reduction policy, we are looking for alternatives to high-sulfur fuel oil, improving the current emission status of ships, and improving the technical level and operating efficiency of ships. As a safe channel for gas transmission, the ship's LNG gas supply system pipeline is particularly important and is generally composed of liquid phase pipelines and gas phase pipelines. The liquid phase pipeline is mainly the filling pipeline from the LNG filling station to the LNG storage tank, and the gas phase pipeline is mainly the gasification & heater, the gas supply pipeline between the main / auxiliary engine, the return gas pipeline to the filling station, and the gas release pipeline of the tank safety valve.

[0005] Due to the long distance between the filling station and the liquid tank, vacuum double-walled pipes are used in all existing ones, and the cost will increase by at least twice compared with single-walled pipes. In addition, the vacuum double-walled pipes need to undergo a vacuum test, and the vacuum test time is generally about 25 days. The construction period is long, which is not conducive to the use of dredgers. Therefore, in view of the above problems, an air supply pipeline structure for a super-large trailing suction dredger is proposed. Utility Model Content

[0006] The utility model aims to overcome the existing defects and provide an air supply pipeline structure of a super large trailing suction dredger, which has reasonable layout and optimizes cost and construction period.

[0007] The technical solution to achieve the above object is: an air supply pipeline structure of a super large trailing suction dredger, including a liquid inlet single-wall pipe, a liquid inlet vacuum double-wall pipe, a return air vacuum double-wall pipe and a return air single-wall pipe;

[0008] The liquid tank is arranged in the LNG storage bin, the liquid inlet vacuum double-walled pipe and the return air vacuum double-walled pipe are located in the LNG storage bin, the left ends of the liquid inlet vacuum double-walled pipe and the return air vacuum double-walled pipe are connected to the liquid tank, the liquid inlet single-walled pipe and the return air single-walled pipe are arranged outside the LNG storage bin, the left end of the liquid inlet single-walled pipe is connected to the right end of the liquid inlet vacuum double-walled pipe, and the right end of the liquid inlet single-walled pipe is connected to the LNG filling station; the left end of the return air single-walled pipe is connected to the right end of the return air vacuum double-walled pipe, and the right end of the return air single-walled pipe is connected to the LNG filling station;

[0009] The LNG user is located outside the LNG storage tank, and the liquid tank is connected to the LNG user through a ventilated double-walled pipe.

[0010] Preferably, the liquid tank is connected to a breathable vacuum double-wall pipe, a breathable mast is arranged outside the LNG storage tank, and the upper end of the breathable vacuum double-wall pipe is connected to the breathable mast.

[0011] Preferably, the liquid inlet vacuum double-walled pipe and the air return vacuum double-walled pipe are each connected to a second air permeable pipe, and the upper ends of the two second air permeable pipes are combined and connected to the air mast.

[0012] Preferably, the outer tubes of the liquid inlet single-wall tube, the return air single-wall tube, and the liquid inlet vacuum double-wall tube and the return air vacuum double-wall tube are all made of stainless steel 316L.

[0013] Preferably, the inner tubes of the liquid inlet vacuum double-walled tube and the air return vacuum double-walled tube are made of stainless steel 316L.

[0014] Preferably, multiple sliding brackets and fixed brackets are radially arranged between the inner and outer tubes of the liquid inlet vacuum double-wall tube, the return air vacuum double-wall tube and the air-permeable vacuum double-wall tube to support multiple inner tubes; a PTFE (polytetrafluoroethylene) gasket is set between the sliding bracket and the outer tube to reduce severe friction between the metal tube walls.

[0015] Preferably, the liquid inlet vacuum double-walled tube, the air return vacuum double-walled tube and the air permeable vacuum double-walled tube are all connected with vacuum valves.

[0016] Preferably, a fan for uninterrupted air extraction is provided in the cavity between the inner and outer tubes of the ventilation double-wall tube.

[0017] Preferably, the outer wall of the liquid inlet single-wall pipe is wrapped with a polyurethane insulation layer.

[0018] The beneficial effects of the utility model are as follows: the air supply pipeline structure of the super-large trailing suction dredger adopts single-wall pipes for the outdoor part and vacuum double-wall pipes for the indoor part, and the air supply adopts ventilated double-wall pipes. According to different outdoor and indoor usage scenarios, the structures of liquid phase pipes and gas phase pipes are reasonably arranged, which reduces costs, shortens construction period and usage restrictions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model is a schematic diagram of the connection of the air supply pipeline structure of the super large trailing suction dredger.

[0020] In the figure: 1. Liquid inlet single-wall pipe; 2. Liquid inlet vacuum double-wall pipe; 3. Return air vacuum double-wall pipe; 4. Return air single-wall pipe; 5. Liquid tank; 6. LNG storage warehouse; 7. LNG filling station; 8. LNG user; 9. Ventilation double-wall pipe; 10. Ventilation mast; 11. Second vent pipe; 12. Vacuum valve; 13. Ventilation vacuum double-wall pipe. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0022] The utility model will be further described below in conjunction with the accompanying drawings.

[0023] like Figure 1As shown, an air supply pipeline structure of an ultra-large trailing suction dredger includes a liquid inlet single-wall pipe 1, a liquid inlet vacuum double-wall pipe 2, a return air vacuum double-wall pipe 3 and a return air single-wall pipe 4; a liquid tank 5 is arranged in an LNG storage bin 6, the liquid inlet vacuum double-wall pipe 2 and the return air vacuum double-wall pipe 3 are located in the LNG storage bin 6, the left ends of the liquid inlet vacuum double-wall pipe 2 and the return air vacuum double-wall pipe 3 are connected to the liquid tank 5, the liquid inlet single-wall pipe 1 and the return air single-wall pipe 4 are arranged outside the LNG storage bin 6, the left end of the liquid inlet single-wall pipe 1 is connected to the right end of the liquid inlet vacuum double-wall pipe 2, and the right end of the liquid inlet single-wall pipe 1 is connected to the LNG filling station 7; the left end of the return air single-wall pipe 4 is connected to the right end of the return air vacuum double-wall pipe 3, and the right end of the return air single-wall pipe 4 is connected to the LNG filling station 7; the LNG user 8 is located outside the LNG storage bin 6, and the liquid tank 5 is connected to the LNG user 8 through the ventilation double-wall pipe 9. The outer tubes of the liquid inlet single-wall pipe 1, the return air single-wall pipe 4, the liquid inlet vacuum double-wall pipe 2 and the return air vacuum double-wall pipe 3 are all made of stainless steel 316L. The inner tubes of the liquid inlet vacuum double-wall pipe 2 and the return air vacuum double-wall pipe 3 are made of stainless steel 316L. The outer wall of the liquid inlet single-wall pipe 1 is wrapped with a polyurethane insulation layer.

[0024] Specifically, the liquid inlet single-wall pipe 1 is located outdoors (outside the LNG storage tank 6) and uses a single-wall pipe. At this time, the gas is low-temperature and liquid, and stainless steel 316L is selected. The gas supply pipe is usually butt-welded, and ordinary U-shaped pipe clamps can be used, but soft materials are required to isolate the pipe from the U-shaped pipe clamp to prevent the pipe from moving and rubbing against the U-shaped clamp to damage the gas supply pipe. The pipeline medium is normal temperature gas. In order to ensure that the gas temperature to each user is not affected by the ambient temperature, the open-air part of the pipeline outside the cabin usually also needs to be insulated.

[0025] Specifically, the liquid inlet vacuum double-wall pipe 2 is located indoors (inside the LNG storage tank 6) and adopts a vacuum double-wall pipe. At this time, the gas is low-temperature and liquid, and stainless steel 316L is selected. The vacuum double-wall pipe is a low-temperature liquid vacuum pipe with both the inner and outer pipes made of steel, and the middle layer is made of radiation-proof composite materials to achieve multi-layer insulation. Moreover, it always remains in a high vacuum state. In addition, the vacuum pipe is sealed to maintain a long-term vacuum state. Therefore, the low-temperature cold damage is greatly reduced, and the cryogenic liquid can be maintained at the required temperature during transportation. The cryogenic liquid vacuum pipeline is made in sections according to the pipeline drawings. Each pipeline adopts vacuum multi-layer winding insulation and has good thermal insulation performance. The pipelines are connected by on-site butt welding or flange connection, which is convenient for installation and maintenance, and greatly saves on-site workload and manufacturing costs. The inner pipe adopts a reasonable auxiliary structure, which has the advantages of advanced technical indicators, stable performance, safety and reliability.

[0026] Specifically, the ventilation double-walled pipe 9 is connected to the LNG user 8, that is, the engine room gas supply pipe. At this time, the gas is in a gaseous state. This part adopts a ventilation double-walled pipe. The material of the inner pipe of the ventilation double-walled pipe 9 is the same as that of the engine room gas supply pipe, and the outer pipe of the double-walled pipe is usually made of stainless steel 316L. Because uninterrupted ventilation is required between the inner and outer pipes of the double-walled pipe to ensure the negative pressure of the pipeline, and a certain number of ventilation times per hour must be achieved. Therefore, the double-walled pipe should be provided with as few elbows as possible to reduce the pipeline resistance. At the same time, in order to detect leaks, a detection threaded interface must be provided at each elbow, and a detection threaded interface must also be provided on a straight pipe section of a specified length. Sufficient detection space needs to be reserved around the detection threaded interface. At the same time, the outer pipe of the double-walled pipe is connected by butt welding, and the pipe section connection needs to be welded on site on board. In order to ensure the welding quality and weld detection, sufficient space needs to be reserved around the double-walled pipe for welding and weld detection. For this reason, double-walled pipes should be arranged first when arranging the pipeline, and sufficient space should be reserved around them to avoid the inability to weld or perform non-destructive testing of welds in the later stage. A certain number of sliding brackets and fixed brackets are radially arranged between the inner and outer tubes of the double-walled tube to ensure that the inner tube has sufficient support. A PTFE liner is set between the sliding bracket and the outer tube to reduce the serious friction caused by direct contact between the metal tube walls.

[0027] Specifically, the liquid tank 5 is connected to a ventilating double-walled vacuum pipe 9, a ventilating mast 10 is arranged outside the LNG storage tank 6, and the upper end of the ventilating double-walled vacuum pipe 9 is connected to the ventilating mast 10. A second ventilating pipe 11 is respectively connected to the liquid inlet vacuum double-walled pipe 2 and the return air vacuum double-walled pipe 3, and the upper ends of the two second ventilating pipes 11 are combined and connected to the ventilating mast 10.

[0028] Specifically, multiple sliding brackets and fixed brackets are radially arranged between the inner and outer tubes of the liquid inlet vacuum double-wall tube 2, the return air vacuum double-wall tube 3 and the air-permeable vacuum double-wall tube 9 to support the multiple inner tubes; a PTFE gasket is set between the sliding bracket and the outer tube to reduce severe friction between the metal tube walls.

[0029] Specifically, the liquid inlet vacuum double-walled tube 2 , the air return vacuum double-walled tube 3 and the air permeable vacuum double-walled tube 9 are all connected with a vacuum valve 12 .

[0030] Specifically, a fan for continuous air extraction is arranged in the cavity between the inner and outer tubes of the ventilation double-wall tube 9 .

[0031] The air supply pipeline structure of this super-large trailing suction dredger adopts single-wall pipes for the outdoor part and vacuum double-wall pipes for the indoor part. The air supply adopts ventilated double-wall pipes. According to different outdoor and indoor usage scenarios, the structures of liquid phase pipes and gas phase pipes are reasonably arranged to reduce costs, shorten construction period and usage restrictions.

[0032] The above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some or all of the technical features therein with equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. An air supply pipeline structure for a super large trailing suction dredger, characterized in that: It comprises a liquid inlet single-wall pipe (1), a liquid inlet vacuum double-wall pipe (2), a return air vacuum double-wall pipe (3) and a return air single-wall pipe (4); The liquid tank (5) is arranged in the LNG storage bin (6), the liquid inlet vacuum double-walled pipe (2) and the return air vacuum double-walled pipe (3) are located in the LNG storage bin (6), the left ends of the liquid inlet vacuum double-walled pipe (2) and the return air vacuum double-walled pipe (3) are connected to the liquid tank (5), the liquid inlet single-walled pipe (1) and the return air single-walled pipe (4) are arranged outside the LNG storage bin (6), the left end of the liquid inlet single-walled pipe (1) is connected to the right end of the liquid inlet vacuum double-walled pipe (2), and the right end of the liquid inlet single-walled pipe (1) is connected to the LNG filling station (7); the left end of the return air single-walled pipe (4) is connected to the right end of the return air vacuum double-walled pipe (3), and the right end of the return air single-walled pipe (4) is connected to the LNG filling station (7); The LNG user (8) is located outside the LNG storage tank (6), and the liquid tank (5) is connected to the LNG user (8) via a ventilated double-walled pipe (9).

2. The air supply pipeline structure of the super large trailing suction dredger according to claim 1 is characterized in that: The liquid tank (5) is connected to a breathable vacuum double-walled pipe (13), a breathable mast (10) is arranged outside the LNG storage tank (6), and the upper end of the breathable vacuum double-walled pipe (13) is connected to the breathable mast (10).

3. The air supply pipeline structure of the super large trailing suction dredger according to claim 2 is characterized in that: The liquid inlet vacuum double-walled pipe (2) and the air return vacuum double-walled pipe (3) are each connected to a second air permeable pipe (11), and the upper ends of the two second air permeable pipes (11) are combined and connected to the air permeable mast (10).

4. The air supply pipeline structure of the super large trailing suction dredger according to claim 1 is characterized in that: The outer tubes of the liquid inlet single-wall tube (1), the gas return single-wall tube (4), the liquid inlet vacuum double-wall tube (2) and the gas return vacuum double-wall tube (3) are all made of stainless steel 316L.

5. The air supply pipeline structure of the super large trailing suction dredger according to claim 1 is characterized in that: The inner tubes of the liquid inlet vacuum double-walled tube (2) and the air return vacuum double-walled tube (3) are made of stainless steel 316L.

6. The air supply pipeline structure of the super large trailing suction dredger according to claim 2 is characterized in that: A plurality of sliding brackets and fixed brackets are radially arranged between the inner and outer tubes of the liquid inlet vacuum double-wall tube (2), the return air vacuum double-wall tube (3) and the air permeable vacuum double-wall tube (13) for supporting the multiple inner tubes; a PTFE pad is arranged between the sliding bracket and the outer tube for reducing severe friction between the metal tube walls.

7. The air supply pipeline structure of the super large trailing suction dredger according to claim 2 is characterized in that: The liquid inlet vacuum double-walled pipe (2), the air return vacuum double-walled pipe (3) and the air permeable vacuum double-walled pipe (13) are all connected to a vacuum valve (12).

8. The air supply pipeline structure of the super large trailing suction dredger according to claim 1, characterized in that: A fan for uninterrupted air extraction is arranged in the cavity between the inner and outer tubes of the ventilation double-wall tube (9).

9. The air supply pipeline structure of the super large trailing suction dredger according to claim 1, characterized in that: The outer wall of the liquid inlet single-wall pipe (1) is wound with a polyurethane heat insulation layer.

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