WO2018077240A1

WO2018077240A1 - Sealing device and grouping unit of natural gas storage system of cng transport ship

Info

Publication number: WO2018077240A1
Application number: PCT/CN2017/108064
Authority: WO
Inventors: 王五开; 李书磊; 韦静静; 邵海波; 张志辉; 王会赏; 刘玉红
Original assignee: 石家庄安瑞科气体机械有限公司
Priority date: 2016-10-28
Filing date: 2017-10-27
Publication date: 2018-05-03
Also published as: CN206171728U

Abstract

A sealing device of a natural gas storage system of a CNG transport ship, comprising a sealing box (2) for a pollution discharge pipeline and a sealing box (10) for a gas loading and discharging pipeline. The sealing box (2) for a pollution discharge pipeline and the sealing box (10) for a gas loading and discharging pipeline are provided on bottom portions and/or top portions of gas bottles or bottle type containers of a grouping unit for gas bottles (1) or bottle type containers in the natural gas storage system, and are filled with a protective gas. A pollution discharge pipeline (A) is located in the sealing box (2) for a pollution discharge pipeline, and a control valve matching the pollution discharge pipeline is located outside the gas bottles (1). A gas loading and discharging pipeline (B) is located in the sealing box (10) for a gas loading and discharging pipeline, and a control valve matching the gas loading and discharging pipeline is located outside the gas bottles (1). The sealing device has no root valves of gas bottles, reducing leakage points, ensuring the safety of the whole natural gas storage system.

Description

Sealing device and grouping unit of natural gas storage system of CNG carrier

Technical field

The invention belongs to a compressed gas marine transportation system, and relates to a CNG transportation vessel, in particular to a sealing device of a CNG carrier natural gas storage system and a cylinder or bottle container grouping unit with the above sealing device.

Background technique

A compressed natural gas (CNG) transport vessel is a cargo ship that transports compressed natural gas. It is increasingly favored because it does not require expensive equipment such as liquefaction equipment and regasification terminals, which is conducive to reducing shipping costs.

US Patent Application No. 96291260.X, which is filed in the United States, discloses a compressed natural gas shipping system in which a compressed gas storage container is provided, each of which includes 3 to 30 compressed gas storage containers. Cylinders, cylinders are installed in the vertical direction in the cabin, and the cabin is covered with hatch covers to prevent seawater from entering. In the above system, the cylinders and pipelines are all covered with hatches, which increases the leakage of dangerous gases into the cargo compartment. The risk inside, and the risk of dangerous gas staying in the cargo compartment. On the other hand, the pipeline and the cylinder are placed in the cabin at the same time, the space is small, which increases the difficulty of pipeline maintenance and overhaul, especially when the pipeline system is set up multiple times. System time, such as loading and unloading pipeline system, safety discharge piping system. Since the collected natural gas may be mixed with other impurity components, after the gas cylinder is used for one time, some liquid or large molecular weight gas will remain at the bottom of the bottle, and it needs to be discharged in time to avoid reducing the purity of the natural gas.

The applicant's prior application No. 201510348091.2 discloses a CNG safe and efficient transport vessel gas cargo system, in which the sewage pipeline and the inlet and outlet pipeline pass through the upper plug assembly, the pipeline and the supporting root of the hatch. The valve and the gas cylinders are connected to each other to achieve sewage discharge. Since the root valve is added to each cylinder, the cost is greatly increased, and the connection mode of the high pressure bottle valve is threaded connection, and a large number of threaded connection points become leakage points, thereby increasing the entire system. The risk of leakage.

Summary of the invention

The problem to be solved by the present invention is to provide a sealing device for a natural gas storage system of a CNG carrier, which is provided with a sewage pipeline sealing box at the bottom sewage outlet of the gas cylinder or the bottle container grouping unit and filled with a shielding gas, and the sewage discharging pipe is disposed outside the sewage outlet. The road is located in the sealed tank of the sewage pipeline to protect the potential leak points at the bottom of the gas cylinder or the bottle container, thus ensuring the safety of the entire bottle unit.

In order to solve the above technical problem, the technical solution adopted by the present invention is: a sealing device for a natural gas storage system of a CNG carrier, which is disposed at the bottom of a gas cylinder or a bottle container of a gas cylinder or a bottle container grouping unit in a natural gas storage system; / or top, the key is: including the sewage pipeline sealing box and the loading and unloading gas pipeline sealing box. The sewage pipeline sealing box is connected with the bottom of each gas cylinder or the bottle container in the gas cylinder or the bottle container grouping unit and is filled with a protective gas; the sewage pipeline is located in the sealed tank of the sewage pipeline, and is matched with the sewage pipeline Control valve is located in the cylinder or bottle container unit external. The loading and unloading gas pipeline sealing box is connected with the top of each gas cylinder or the bottle container in the gas cylinder or the bottle container grouping unit and is filled with a protective gas; the loading and unloading gas pipeline is located in the sealing and discharging gas pipeline sealing box and the control valve matched with the loading and unloading gas pipeline Located outside the cylinder or bottle container unit.

Further, the sewage pipeline sealing box comprises a connecting plate connected to each cylinder or bottle container in the gas cylinder or the bottle container grouping unit and a bottom cover fixed to the connecting plate.

Further, the lower end of the gas cylinder or the bottle container is screwed with a spherical flange having a spherical boss, and the connecting plate is welded with a tapered hole seat having a relative rotational cooperation with the spherical flange, the spherical flange and the tapered hole a swing limit mechanism for a gas cylinder or a bottle container is disposed between the seats; the swing limit mechanism includes a pre-tightening bolt fixedly connected to the spherical flange and passing through the connecting plate, a nut fixed on the pre-tightening bolt, and a limit A butterfly spring between the bottom surface of the connecting plate and the nut.

Further, a sealing structure is disposed between the spherical flange and the connecting plate, and the sealing structure comprises a first sealing gasket disposed between the spherical flange and the top surface of the connecting plate, and is disposed on the pre-tightening bolt and located in the butterfly a second sealing gasket between the spring and the connecting plate.

Further, the sewage pipeline and the loading and unloading pipeline are welded by prefabricated pipe fittings.

Further, the sewage gas sealing box and the loading and unloading gas pipeline sealing box are respectively fixed with a protective gas charging and discharging gas pipeline connected thereto, and the gas component detecting port and the shielding gas charging and discharging air port are provided at the end of the protective gas charging and discharging gas pipeline.

Further, the loading and unloading gas pipeline sealing box comprises a bottom plate and a protective cover. The bottom plate is connected to the connecting flange of the top of the gas cylinder or the bottle container by a bolt, and the protective cover is fixed on the bottom plate, and the sealing flange is disposed between the connecting flange and the bottom plate.

Further, a positioning adjustment device is disposed between the loading and unloading gas pipeline sealing box and the sewage pipeline sealing box, and the positioning adjusting device comprises an intermediate plate, a connecting rod and a position adjusting rod. The two ends of the connecting rod are respectively hinged with the intermediate plate and the sewage pipeline sealing box, one end of the position adjusting rod is hinged with the intermediate plate, and the other end passes through two position adjusting rods connected to the adjusting nut by the bottom plate of the sealing and discharging pipeline sealing box.

Further, the positioning adjustment device is disposed in four planes between the loading and unloading gas pipeline sealing box and the sewage pipeline sealing box, and the positioning adjustment device on each side comprises a pair of connecting rods and a pair of position adjusting rods, connecting rods and position adjustment The rods are arranged in a cross shape, and the intermediate plate is disposed between the pair of connecting rods and the pair of position adjusting rods in a vertical direction.

In addition, the present invention also provides a gas cylinder or bottle container grouping unit, the key point is that it comprises a gas cylinder or a bottle container, and has the above-mentioned sealing device, and the sealing device is disposed at the bottom of the gas cylinder or the bottle container and / or top.

Further, the sealing device comprises a sewage pipeline sealing box, and the sewage pipeline sealing tank is provided with a sewage pipeline and a loading and unloading gas pipeline.

Further, the sealing device comprises a sealing pipe for loading and unloading gas pipelines, and a sewage discharging conduit is provided in the sealing box of the loading and unloading gas pipeline And loading and unloading gas lines.

The beneficial technical effects of the present invention are as follows: 1. The sewage pipeline outside the sewage outlet is disposed in the sealed tank of the sewage pipeline and the protective gas is filled in the sealed tank of the sewage pipeline, thereby ensuring the safety of the entire system;

2. The sewage line of a gas cylinder or bottle container grouping unit only has a control valve at the sewage outlet, which reduces the cost and leakage point;

3. The relative freedom of swing between the sealed pipeline sealing tank and the gas cylinder or the bottle container is beneficial to the fine adjustment of the position of the gas cylinder or the bottle container when the gas cylinder or the bottle container is grouped, and the gas cylinder when the vessel fluctuates at sea. Or the bottom of the bottle container swings with the ship; 3. The part of the sewage pipeline located outside the sealed tank of the sewage pipeline is located in the protective gas filling and discharging gas pipeline to realize the protection of the overall sewage pipeline;

4. The protective gas filling and discharging gas pipeline is provided with a protective gas aeration port and a gas detecting port, realizing real-time gas component detection and charging and discharging of the shielding gas to ensure system safety;

5. Install the loading and unloading gas pipeline sealing box on the top of the gas cylinder or the bottle container grouping unit. The entire loading and unloading gas pipeline is located in the sealed box filled with the protective gas, further improving the safety of the whole system, and grouping a gas cylinder or a bottle container. The loading and unloading gas pipeline of the unit only provides a control valve at the loading and unloading port, which greatly reduces the cost and leakage point;

6. Positioning adjustment device is installed between the sealing box of the loading and unloading gas pipeline and the sealing box of the sewage pipeline, so that the sealing box of the loading and unloading gas pipeline, the sealing tank of the sewage pipeline, and the gas between the sealing box of the loading and unloading gas pipeline and the sealing tank of the sewage pipeline The bottle or the bottle container is formed into a whole body to realize the positioning and overall reinforcement of the gas bottle or the bottle container;

7. The sewage pipeline and the loading and unloading gas pipeline are welded by prefabricated pipe fittings, the overall structure is stable, the airtightness is high, and there is no leakage point.

The invention will be described in detail below with reference to the accompanying drawings.

DRAWINGS

1 is a schematic structural view of a sealed tank sealing tank in a sealing device of a natural gas storage system of a CNG carrier of the present invention;

Figure 2 is a partial enlarged view of M in Figure 1;

3 is a schematic structural view of a sealing and discharging pipe of a loading and unloading gas pipeline in a sealing device of a natural gas storage system of a CNG carrier of the present invention;

Figure 4 is a schematic structural view of a gas cylinder or bottle container grouping unit of the present invention;

Figure 5 is a plan view of Figure 4;

Figure 6 is a bottom plan view of Figure 5 with the undercover of the drain line sealed box removed.

In the drawings: 1 is a gas cylinder or bottle container, 2 is a sewage pipeline sealing box, 2-1 is a connecting plate, 2-2 is a bottom cover, 2-3 is a partition, 3 is a spherical flange, 4 It is a conical hole seat, 5 is a pre-tightening bolt, 6 is a first sealing gasket, 7 is a butterfly spring, 8 is a second sealing gasket, 9 is a protective gas filling and discharging gas pipe, 10 is a loading and unloading gas pipe sealing box, 10 -1 is the bottom plate, 10-2 is the protective cover, 11 is the connecting flange, 12 is the loading and unloading air sealing washer, 13 is the connecting rod, 14 is the intermediate plate, 15 is the position adjusting rod, 16 is the adjusting nut, A is the drain pipe Road, B represents the loading and unloading gas pipeline.

detailed description

Referring to Figure 4, the present invention provides a sealing device for a CNG carrier natural gas storage system disposed at the bottom and/or top of a gas cylinder or bottle container 1 of a gas cylinder or bottle container grouping unit in a natural gas storage system. The key is that the sealing device comprises a sewage line sealing box 2 and/or a loading and unloading line sealing box 10.

The sewage line sealing box 2 is connected to the bottom of each cylinder or bottle container 1 in the gas cylinder or the bottle container grouping unit, and is filled with a shielding gas. Loading and unloading the gas line sealing box 10. It is connected to the top of each cylinder or bottle container 1 in the cylinder or bottle container group and is filled with a protective gas.

The sewage pipeline A is located in the sewage pipeline sealing box 2, and the control valve matched with the sewage pipeline A is located outside the gas cylinder or the bottle container grouping unit. The loading and unloading gas pipeline B is located in the loading and unloading gas pipeline sealing box 10, and the control valve matched with the loading and unloading gas pipeline B is located outside the cylinder or bottle container grouping unit.

By setting the sewage pipeline sealing box 2, loading and unloading the gas pipeline sealing box 10 and filling the shielding gas, the sewage pipeline A is disposed in the corresponding sealing box except for the sewage outlet, the loading and unloading gas pipeline B except the loading and unloading port and the safety discharge port, thereby realizing potential Protection from leaks. The above-mentioned filling protective gas is preferably nitrogen.

Referring to Figures 1, 2 and 6, the sewage line sealing box 2 includes a connecting plate 2-1 connected to each cylinder or bottle container 1 in a gas cylinder or a bottle container grouping unit, and is fixed to the connecting plate 2-1. The bottom cover 2-2 and the partition 2-3 fixed between the connecting plate 2-1 and the bottom cover 2-2. A plurality of vent holes for passing gas and a through hole for the sewage pipe A to pass through are disposed in the partition 2-3, and a rubber buffer sleeve is disposed at a passing portion of the through hole and the drain line A to prevent transportation. The drain line A is in direct contact with the partition 2-3 during the fluctuation of the ship.

The lower end of the gas cylinder or the bottle container 1 is screwed to the spherical flange 3 having a spherical boss. The connecting plate 2-1 is welded with a tapered hole seat 4 having a relative rotational fit with the spherical flange 3, and the spherical flange 3 is A swinging stop mechanism for the gas cylinder or the bottle container is disposed between the tapered hole holders 4.

The swing limiting mechanism includes a pre-tightening bolt 5 fixedly connected to the spherical flange 3 and passing through the connecting plate 2-1, a nut fixed on the pre-tightening bolt 5, and a limit between the bottom surface of the connecting plate 2-1 and the nut. The butterfly spring 7.

A sealing structure is disposed between the spherical flange 3 and the connecting plate 2-1, and the sealing structure comprises a first sealing gasket 6 disposed between the spherical flange 3 and the top surface of the connecting plate 2-1 and a set of pre-tightening bolts 5 is located on the second sealing gasket 8 between the butterfly spring 7 and the connecting plate 2-1.

Referring to Figures 3-5, in each cylinder or bottle container 1 in the gas cylinder or bottle container unit, there is a loading and unloading gas line B communicating therewith and a control valve connected to the loading and unloading gas line B. The end plug and the loading and unloading gas pipeline B at the top of each gas cylinder or bottle container in the gas cylinder or the bottle container grouping unit are located in the loading and unloading gas pipeline sealing box 10, and the loading and unloading gas port of the loading and unloading gas pipeline B and the supporting safety discharge port are located in the loading and unloading gas pipeline Outside the road sealing box 10, the above-mentioned loading and unloading gas line sealing box 10 includes a bottom plate 10-1 and a protective cover 10-2 fixed above the bottom plate 10-1, and the bottom plate 10-1 is connected to the top of the gas cylinder or the bottle container by bolts. The flange 11 is connected and located below the connecting flange 11, and a loading and unloading air sealing gasket 12 is disposed between the connecting flange 11 and the bottom plate 10-1.

Referring to Figures 1 and 4, a protective gas charging and discharging gas pipe 9 communicating therewith is fixed to both the sewage line sealing box 2 and the loading and unloading gas line sealing box 10. At the end of the shielding gas charging and discharging gas pipe 9, two interfaces are provided, one is a charging and discharging air interface, and the other is a gas component detecting interface. When it is detected that there is more gas in the sewage pipeline sealing box 2, the gas in the sewage pipeline sealing box 2 is evacuated through the charging and discharging air interface and a new pure shielding gas is added. If the increase rate of the combustible gas component exceeds a certain value when it is detected, consider whether there is a leak.

In the specific implementation, in order to facilitate the charging and discharging and component detection of the loading and unloading gas pipeline sealing box 10, the protective gas charging and discharging gas pipeline 9 extends upward and passes through the loading and unloading gas pipeline sealing box 10. The portion of the sewage pipe A located outside the sewage pipe sealing box 2 is located in the shielding gas charging and discharging gas pipe 9 and is sealingly connected to the end portion of the shielding gas charging and discharging gas pipe 9. The part of the sewage pipeline A located outside the sealed pipeline sealing tank 2 is located in the protective gas charging and discharging gas pipeline 9, and the sealing of all the sewage pipeline A is realized, and the purpose of sealing the sewage pipeline A is achieved.

Referring to Figure 4, the sealing device further includes positioning adjustment means disposed between the loading and unloading gas line sealing box 10 and the sewage line sealing box 2. The positioning adjustment device includes a vertical intermediate plate 14, a connecting rod 13, and a position adjusting rod 15.

Both ends of the connecting rod 13 are hinged to the intermediate plate 14 and the sewage line sealing box 2, respectively. One end of the position adjusting lever 15 is hinged to the intermediate plate 14, and the other end passes through the bottom plate 10-1 of the loading and unloading gas line sealing case 10 and is connected to the adjusting nut 16. The connection between the loading and unloading gas line sealing box 10 and the sewage line sealing box 2 is achieved by providing a positioning adjustment device.

In a specific implementation, the positioning adjustment device can be disposed in the four faces between the loading and unloading gas pipeline sealing box 10 and the sewage pipeline sealing box 2, thereby realizing the positioning adjustment of the gas cylinder or the bottle container. Further, the positioning adjustment device of each side includes a pair of connecting rods 13 and a pair of position adjusting rods 15, and the connecting rods 13 and the position adjusting rods 15 are disposed in a cross shape.

Referring to Figure 4, the present invention also provides a gas cylinder or bottle container grouping unit having the above-described sealing device. The sealing device is placed at the bottom and/or top of the gas cylinder or bottle container.

The drain line A and the loading and unloading line B can also be disposed in the same sealed box. For example, when only one of the drain line sealing box 2 and the loading and unloading line line sealing box 10 is provided, the drain line A and the loading and unloading line B can be simultaneously disposed in the sealed box.

Claims

A sealing device for a CNG carrier natural gas storage system, disposed at the bottom and/or top of a gas cylinder or a bottle container of a gas cylinder or a bottle container grouping unit in a natural gas storage system, wherein the sealing device comprises:

The sewage pipeline sealing box (2) is connected to the bottom of each cylinder or bottle container (1) in the cylinder or bottle container grouping unit and filled with shielding gas; the sewage pipeline (A) is located in the sewage pipeline sealing In the tank (2), a control valve associated with the sewage line (A) is located outside the gas cylinder or bottle container grouping unit; and/or

The loading and unloading gas pipeline sealing box (10) is connected with the top of each cylinder or bottle container (1) in the gas cylinder or the bottle container grouping unit and is filled with a protective gas; the loading and unloading gas pipeline (B) is located in the loading and unloading gas pipeline sealing box ( 10) The control valve associated with the loading and unloading gas line (B) is located outside the gas cylinder or the bottle container grouping unit.
The sealing device for a natural gas storage system of a CNG carrier according to claim 1, wherein the sewage line sealing box (2) comprises a gas cylinder or a bottle container in a gas cylinder or a bottle container grouping unit ( 1) Connected connecting plate (2-1) and bottom cover fixed with connecting plate (2-1) (2-2)
The sealing device for a natural gas storage system of a CNG carrier according to claim 2, characterized in that the lower end of the gas cylinder or the bottle container (1) is screwed with a spherical flange (3) having a spherical boss, and the connecting plate (2-1) A tapered hole seat (4) having a relative rotational fit with the spherical flange (3) is welded thereon, and a gas cylinder or a bottle type is disposed between the spherical flange (3) and the tapered hole seat (4). a swing limit mechanism of the container; the swing limit mechanism comprises a pre-tightening bolt (5) fixedly connected to the spherical flange (3) and passing through the connecting plate (2-1), and fixed on the pre-tightening bolt (5) The nut and the butterfly spring (7) are defined between the bottom surface of the connecting plate (2-1) and the nut.
A sealing device for a CNG carrier natural gas storage system according to claim 3, characterized in that a sealing structure is provided between the spherical flange (3) and the connecting plate (2-1), the sealing structure comprising a spherical surface a first sealing gasket (6) between the flange (3) and the top surface of the connecting plate (2-1) and a set on the pre-tightening bolt (5) and located in the butterfly spring (7) and the connecting plate (2-1) ) between the second sealing gasket (8).
The sealing device for a natural gas storage system of a CNG carrier according to claim 1, wherein the sewage pipe (A) and the loading and unloading gas pipe (B) are both welded by prefabricated pipe fittings.
The sealing device for a natural gas storage system of a CNG carrier according to claim 1, characterized in that: the sewage sealing pipe sealing box (2) and the loading and unloading gas pipeline sealing box (10) are fixed with a shielding gas charging and discharging gas connected thereto The pipe (9), the end of the protective gas charging and discharging gas pipe (9) is provided with a gas component detecting port and a shielding gas charging and discharging port.
The sealing device for a CNG carrier natural gas storage system according to claim 1, wherein the loading and unloading gas line sealing box (10) comprises a bottom plate (10-1) and a protective cover (10-2), and the bottom plate (10) -1) by bolt Connected to the connecting flange (11) at the top of the cylinder or bottle container, the protective cover (10-2) is fixed above the bottom plate (10-1), between the connecting flange (11) and the bottom plate (10-1) A loading and unloading gas seal gasket (12) is provided.
The sealing device for a natural gas storage system of a CNG carrier according to any one of claims 1 to 7, characterized in that: positioning between the loading and unloading gas pipeline sealing box (10) and the sewage pipeline sealing box (2) The adjusting device comprises an intermediate plate (14), a connecting rod (13) and a position adjusting rod (15), and two ends of the connecting rod (13) and the intermediate plate (14) and the sewage line sealing box respectively (2) Hinged, one end of the position adjusting rod (15) is hinged to the intermediate plate (14), and the other end is connected to the adjusting nut (16) through the bottom plate (10-1) of the sealing and sealing pipe (10).
A sealing device for a CNG carrier natural gas storage system according to claim 8, wherein the positioning adjustment device is disposed in four planes between the loading and unloading gas line sealing box (10) and the sewage line sealing box (2) The positioning adjustment device of each side comprises a pair of connecting rods (13) and a pair of position adjusting rods (15), the connecting rods (13) and the position adjusting rods (15) are arranged in a cross shape, and the intermediate plate (14) is vertical The direction is disposed between the pair of connecting rods (13) and the pair of position adjusting levers (15).
A gas cylinder or bottle container grouping unit, comprising: a gas cylinder or a bottle container and the sealing device according to any one of claims 1 to 9, the sealing device being disposed at the bottom of the gas cylinder or the bottle container And / or top.
The gas cylinder or bottle container grouping unit according to claim 10, wherein the sealing device comprises a sewage line sealing box (2), and the sewage line sealing box (2) is provided with a sewage line (A) ) and loading and unloading gas lines.
The gas cylinder or bottle container grouping unit according to claim 10, wherein the sealing device comprises a loading and unloading gas pipeline sealing box (10), and the loading and unloading gas pipeline sealing box (10) is provided with a sewage pipeline (A). ) and loading and unloading gas lines.