KR102423212B1 - Lng bunkering station module and lng fueled ship having the same - Google Patents

Abstract

The present invention relates to an LNG bunkering station module for small ships, comprising: a casing forming the exterior of the LNG bunkering station module for small ships; an LNG supply line that supplies LNG supplied from the outside to an LNG fuel tank provided in a ship; A first cryogenic valve installed on the LNG supply line to control the flow rate of the supplied LNG; an LNG boil-off gas recovery line for discharging the LNG boil-off gas generated from the LNG fuel tank to the outside; a second cryogenic valve installed on the LNG boil-off gas recovery line to control the flow rate of the recovered boil-off gas; and a nitrogen purge line for purging by injecting nitrogen gas into the LNG supply line or the LNG boil-off gas recovery line, wherein the first cryogenic valve is a first double block comprising a first shut-off valve, a second shut-off valve and a first bleed valve. a valve device (Double Block and Bleed valve), wherein the second cryogenic valve is a second double block valve device comprising a third shutoff valve, a fourth shutoff valve and a second bleed valve, and the second cryogenic valve of the first double block valve device 1 The bleed valve is characterized in that it is connected to the LNG drain pipe.

Description

LNG bunkering station module for small ships and LNG fuel-powered small ships equipped therewith

The present invention relates to an LNG bunkering station module for a ship and an LNG fuel-powered ship having the same, and more particularly, to an LNG bunkering station module configured to be compact to be suitable for a small ship, and to increase the barrier properties and leakage safety of LNG, and to have the same It relates to a small vessel propelled by LNG fuel.

Demand for reduction of SOx, NOx, and CO2 generated during operation of ships is increasing internationally. As oil prices rise, ships that can reduce ship operating costs have been developed by using LNG as a propulsion fuel instead of conventional oil. is becoming

Meanwhile, the International Sulfur Cap 2020 was confirmed at the 70th MPEC meeting, making it virtually impossible to use existing fuel oils such as IFO 380 and 180 (sulfur content 3.5%). Accordingly, it is expected that orders for LNG-fueled ships at home and abroad will increase starting in 2020.

It is essential to inject and supply LNG used as fuel for LNG fuel-powered ships. The technology of supplying LNG from the outside of the ship to the LNG fuel tank inside the ship is called LNG bunkering, and An intermediate device located between the LNG supply source and the LNG fuel tank that safely supplies the fuel tank inside the ship in injection and supply from the outside is called an LNG bunkering station.

Since the LNG bunkering station is a hazardous facility that directly supplies LNG, it is required to comply with international gas-powered ship standards, which are international safety regulations. The international gas-powered ship standards reflect essential safety matters for the operation of LNG-fueled ships, and mainly contain requirements that consider the risks of liquefied gas compared to traditional liquid fuels. It deals with double pipe pipework of fuel pipe to prevent gas leakage, double shutoff and discharge valve, air lock between safe zone and hazardous zone, and purging requirements of gas pipe.

On the other hand, since most ships such as government ships operating in the coast are small ships of less than 500 ton class, it is not easy to directly apply them considering the size of the conventional LNG bunkering station facilities.

Korean Patent No. 1338811

An object of the present invention is to provide an LNG bunkering station module for a small vessel suitable for an LNG fuel-propelled small vessel, which has been devised to solve the problems of the prior art.

In addition, an object of the present invention is to provide a compact LNG bunkering station module suitable for small ships.

In addition, an object of the present invention is to provide an LNG bunkering station module for small ships with increased barrier properties and leakage safety of LNG during LNG bunkering.

Another object of the present invention is to provide an LNG bunkering station packaged (skid-formed) so that it can be easily applied even when an existing ship is converted into an LNG fuel-powered ship.

An LNG bunkering station module for small ships according to the present invention includes: a casing forming the exterior of the LNG bunkering station module for small ships; an LNG supply line that supplies LNG supplied from the outside to an LNG fuel tank provided in a ship; A first cryogenic valve installed on the LNG supply line to control the flow rate of the supplied LNG; an LNG boil-off gas recovery line for discharging the LNG boil-off gas generated from the LNG fuel tank to the outside; a second cryogenic valve installed on the LNG boil-off gas recovery line to control the flow rate of the recovered boil-off gas; and a nitrogen purge line for purging by injecting nitrogen gas into the LNG supply line or the LNG boil-off gas recovery line, wherein the first cryogenic valve is a first double block comprising a first shut-off valve, a second shut-off valve and a first bleed valve. a valve device (Double Block and Bleed valve), wherein the second cryogenic valve is a second double block valve device comprising a third shut-off valve, a fourth shut-off valve and a second bleed valve, and the first bleed of the first double block valve device The valve is characterized in that it is connected to the LNG drain pipe.

In addition, the LNG bunkering station module for small ships according to the present invention includes a fire detector for detecting a fire inside or around the casing; And it may further include a fire fighting equipment (Fire Fighting) for suppressing the fire.

Specifically, it may further include a fire extinguishing material storage tank in which the fire extinguishing material of the firefighting equipment is stored.

In addition, the fire detector may include any one or more of a flame detector and a combustible gas detection, and the firefighting equipment may include a nozzle spray for spraying a fire extinguishing agent.

The LNG bunkering station module for small ships according to the present invention may further include a leak detector for detecting LNG or BOG leaking from an LNG supply line or an LNG BOG recovery line.

In addition, the LNG bunkering station module for a small vessel according to the present invention includes a first pressure transmitter connected to the LNG supply line to sense the pressure of the LNG supply line; a first temperature transmitter connected to the LNG supply line to sense the temperature of the LNG supply line; a second pressure transmitter connected to the LNG boil-off gas recovery line to sense the pressure of the LNG boil-off gas recovery line; and a second temperature transmitter connected to the LNG boil-off gas recovery line to sense the temperature of the LNG boil-off gas recovery line.

In addition, the LNG bunkering station module for small ships according to the present invention receives detection signals from a fire detector, a leak detector, a first pressure transmitter, a first temperature transmitter, a second pressure transmitter, and a second temperature transmitter, and responds to the received detection signal. Accordingly, it may further include a programmable logic controller (PLC) for controlling the firefighting equipment, the first double block valve device, or the second double block valve device.

In addition, in the LNG bunkering station module for small ships according to the present invention, a drip tray may be provided under the LNG supply line.

In addition, the LNG bunkering station module for small ships according to the present invention may include an inert fluid spray for protecting the hull from LNG by spraying the fluid to form a curtain shape.

In addition, the present invention provides an LNG fuel-propelled small vessel equipped with the above-described LNG bunkering station module for small vessels.

Specifically, the LNG bunkering station module may be provided on an upper deck or a pilot station hatch.

In addition, the LNG fuel-propelled vessel according to the present invention may be less than 500 tons.

According to the above configuration, the present invention can provide a compact LNG bunkering station module suitable for small ships.

In addition, despite being compact, it is possible to provide an LNG bunkering station module for small ships that has increased barrier properties and leakage safety of LNG during LNG bunkering.

In addition, it is possible to additionally package the fire extinguishing agent storage tank supplied to the firefighting equipment due to the compact configuration, so that it can be easily applied even when an existing ship is converted to an LNG fuel-powered ship (skid) LNG bunkering station can be provided.

1 is a schematic diagram of an LNG bunkering station module for small ships according to an embodiment of the present invention.
Figure 2 is a perspective view showing the external shape of the double block valve device.
3 is a cross-sectional view showing the internal shape of the double block valve device.

Since the present invention can have various changes and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail.

However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention. In describing each figure, like reference numerals have been used for like elements.

and/or includes a combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being “connected” or “connected” to another component, it may be directly connected or connected to the other component, but it is understood that other components may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the other element does not exist in the middle.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It is to be understood that this does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a schematic diagram of an LNG bunkering station module for small ships according to an embodiment of the present invention. Referring to FIG. 1 , the LNG bunkering station module includes a role of receiving LNG used as a fuel of a ship from the outside and transferring it to an LNG fuel tank (T) installed in the ship, and the LNG supply line 200, LNG evaporation It may include a gas recovery line 300 and a nitrogen purge line 400 . The LNG bunkering station module includes a casing 1000 that forms the exterior of the LNG bunkering station module, an LNG supply line 200 that supplies LNG supplied from the outside to an LNG fuel tank T provided in a ship, and an LNG supply line 200 ) installed on the first cryogenic valve to control the flow rate of LNG supplied along the supply line, and recovery of LNG boil-off gas that discharges LNG boil-off gas (BOG) generated from the LNG fuel tank (T) to the outside Line 300, a second cryogenic valve installed on the LNG boil-off gas recovery line 300 to control the flow rate of the recovered boil-off gas, and nitrogen gas in the LNG supply line 200 or the LNG boil-off gas recovery line 300 It may be packaged including a nitrogen purge line 400 for purging by injecting.

In addition, the first cryogenic valve and the second cryogenic valve may be a double block valve device (Double Block and Bleed valve, DBB valve) (210, 310).

The double block valve device is a combination of a double ball valve and a bleed valve, and it is a valve device that can improve the barrier properties and leakage stability of the pipe. In general, a valve is a device that blocks the flow of a fluid in various industrial pipes or controls the flow rate and pressure of the fluid, and various types of valves are selectively used according to the conditions of the pipe or a function required in the pipe. Among the various valves currently used, the ball valve has excellent sealing properties, durability, and operability, and has low fluid resistance, so it is widely used for the purpose of blocking the flow of fluid inside the pipe. On the other hand, since fluids such as oil and gas are handled in pipelines such as offshore plant facilities, petroleum industry facilities, and facilities handling cryogenic fluids, it is particularly important to block and prevent leakage of fluids in the pipelines, and various international regulations Strict management is required. For this reason, it is possible to utilize a double block valve device in the form of a combination of a double ball valve and a bleed valve in order to increase the barrier properties and leakage stability of the pipe.

Figure 2 shows the outer shape of the double block valve device, Figure 3 shows the inner shape of the double block valve device.

As shown in FIGS. 2 and 3 , the double block valve device includes a valve body 10 , a first shutoff valve 1 , a second shutoff valve 2 and a bleed valve 3 . The valve body 10 is connected to a pipe (not shown) to have an inlet 11a for introducing a fluid to one side and an outlet 11b for discharging the fluid flowing into the inlet 11a. The first shut-off valve 1 and the second shut-off valve 2 are each configured as a ball valve and are sequentially installed on the upstream side and the downstream side of the valve body 10, respectively, so that they pass through the flow path inside the valve body 10 Double block or open the fluid. And the bleed valve 3 is installed between the first shut-off valve 1 and the second shut-off valve 2 to prevent the fluid from leaking from the high pressure to the low pressure side when the first and second shut-off valves 1 and 2 are closed. It serves to remove the residual pressure inside it.

Typically, such a double-block valve device is operated to open the first shut-off valve 1 and the second shut-off valve and close the bleed valve 3 when allowing the fluid to pass therethrough. And, when the fluid is shut off, the first shutoff valve 1 and the second shutoff valve 2 are closed at the same time, and the bleed valve 3 is operated to open. Therefore, even if the first shut-off valve 1 leaks or is accidentally opened, the flow of the fluid can be blocked by the second shut-off valve 2 . In addition, since the fluid that seeps between the first and second shut-off valves 1 and 2 due to leakage of the first shut-off valve 1 is safely vented through the bleed valve 3, the two valves 1 and 2 It can be managed more safely by preventing the increase in pressure between them.

In the LNG bunkering station module for small ships according to an embodiment of the present invention, the bleed valve of the first double block valve device 210 is connected to the LNG drain pipe 211, and the first shutoff valve and the second shutoff valve are When locked, the fluid located between the first shutoff valve and the second shutoff valve may be discharged to the drain pipe 211 through the bleed valve. In addition, since the fluid that has penetrated between the first and second shut-off valves is also discharged to the LNG drain pipe 211 through the bleed valve, it is possible to prevent an increase in pressure between the first and second shut-off valves, and as a result, the It is possible to increase the barrier properties and leakage stability.

The LNG bunkering station module for small ships according to an embodiment of the present invention includes a fire detector 600 that detects a fire inside or around a casing 1000 and a fire fighting facility that can suppress the fire (Fire Fighting, 100). may include

The fire detector 600 may be a flame detector or a combustible gas detector, and any fire-related detection device may be included, but is not limited thereto.

The fire-fighting equipment 100 may include a pipe through which the fire-fighting material moves and a nozzle spray for spraying the fire-extinguishing material from the pipe. A fire extinguishing material refers to a raw material for extinguishing a fire, and various known fire extinguishing raw materials such as powder, foam, inert gas may be used, and it is not limited to those listed above.

The LNG bunkering station module for small ships according to an embodiment of the present invention may further include a fire extinguishing agent storage tank 120 . In the case of a typical LNG bunkering station module, the space in which the fire extinguishing material is stored, that is, the storage tank is disposed outside the module, and the fire extinguishing material storage tank and the fire-fighting equipment of the LNG bunkering station module are connected and used. The module can be packaged by arranging the fire extinguishing agent storage tank 120 in the module. This saves space by arranging double block valve devices 210 and 310 without installing a plurality of valves on the LNG supply line 200 and the LNG boil-off gas recovery line 300, and the fire extinguishing agent storage tank ( 120), so that it can be packaged compactly.

In addition, on the LNG supply line 200 , a leak detector 240 capable of detecting leaked LNG, a first pressure transmitter 220 sensing the pressure of the LNG supply line, and a first temperature sensing the temperature of the LNG supply line A transmitter 230 may be included. Similarly, on the LNG boil-off gas recovery line 300, a leak detector 440 capable of detecting leaking boil-off gas, a second pressure transmitter 320 for detecting the pressure of the LNG boil-off gas recovery line, and the LNG boil-off gas recovery line It may include a second temperature transmitter 330 for sensing the temperature, and receiving a detection value or a detection signal from them, the firefighting equipment 100, the first double block valve device 210, or the second double block valve device It may include a programmable logic controller (PLC) 700 for controlling the 310 .

Specifically, the leak detectors 240 and 440 provided on the LNG supply line 200 and the LNG boil-off gas recovery line 300 are the LNG or boil-off gas leaking from the LNG supply line 200 or the LNG boil-off gas recovery line 300 . can be detected to transmit a detection signal to the PLC 700 . The first pressure transmitter 220 and the first temperature transmitter 230 provided on the LNG supply line 200 may detect the pressure and temperature on the LNG supply line 200 and transmit them to the PLC 700 . The second pressure transmitter 320 and the second temperature transmitter 330 provided on the LNG BOG recovery line 300 may detect the pressure and temperature on the LNG BOG recovery line 300 and transmit it to the PLC 700 . have. Data of PLC 700 can be transmitted to HMI (Human Machine Interface) PC 800 and DCS (Distributed Control System, 900), and the administrator uses HMI PC 800 to HMI screen 810 or DCS ( By analyzing the detection value or detection signal received from the PLC 700 through 900), it is possible to monitor and control the state in the LNG bunkering station module, and the operation of the firefighting equipment 100 or the first double block valve device 210 ) or the opening or closing degree of the second double block valve device 310 can be controlled. In addition, by logicizing this control, the monitoring status is diagnosed according to a preset level range, and the firefighting equipment 100 is automatically operated or the first double block valve device 210 or the second double block valve device 310 is opened and closed. Alternatively, it is also possible to control the opening degree.

On the other hand, the LNG bunkering station module for small ships according to an embodiment of the present invention may include the above-described PLC 700 , HMI PC 800 , HMI 810 , or fire extinguishing tank 120 selectively or in combination. have. In other words, if a more compact LNG bunkering station module is required, it can be miniaturized by excluding the extinguishing agent tank 120, and there is a demand for a packaged LNG bunkering station that can perform all functions up to the operation of the manager. In this case, the PLC 700 , the HMI PC 800 , and the HMI 810 may all be included.

In the LNG bunkering station module for small ships according to an embodiment of the present invention, a drip tray 500 is provided at the lower part of the casing 1000 , preferably at the lower part of the LNG supply line 200 and the lower part of the LNG boil-off gas recovery line 300 . can be The trip tray 500 is configured to prevent damage to the vessel, and due to the LNG corresponding to cryogenic temperature during the bunkering process or the movement of fuel, the pipe, preferably the LNG supply line 200 or the LNG boil-off gas recovery line 300 It can support water or leaking fluid, and it may be provided at an expected point where water is formed or fluid is dropped, such as a lower portion to which the LNG supply line 200 or the LNG boil-off gas recovery line 300 is connected.

The LNG bunkering station module for small ships according to an embodiment of the present invention may include an inert fluid spray (not shown). The inert fluid spray is a component that protects the hull bulkhead by spraying an inert fluid such as water or nitrogen to the hull bulkhead. In order to protect the hull bulkhead by forming a curtain shape by spraying the fluid from the inert fluid spray to the hull bulkhead.

The above LNG bunkering station module for small ships may be mounted on an LNG fuel-powered ship. In addition, since it is modularized (packaging, skid), it can be easily installed and applied not only to newly built ships but also to remodeled ships that have been converted to LNG fuel propulsion.

The term "small ship" as used herein preferably includes ships of less than 500 ton class. In the case of such a small vessel, since a large LNG bunkering station module mounted on a medium or large vessel cannot be mounted as it is, a miniaturized module is required, and the LNG bunkering station module according to the present invention can satisfy this demand.

The LNG bunkering station module for a small ship according to the present invention may be provided on the upper deck of the ship, preferably on the upper deck. In addition, the LNG bunkering station module for a small ship according to the present invention may be provided in both side surfaces of the ship, preferably in a pilot station hatch.

The above-mentioned embodiments of the present invention have been described with reference to the embodiments shown in the drawings for better understanding, but these are merely exemplary, and those of ordinary skill in the art may make various modifications and equivalents therefrom. It will be appreciated that embodiments are possible. Accordingly, the true technical protection scope of the present invention should be defined by the appended claims.

100: firefighting equipment 200: LNG supply line
300: LNG boil-off gas recovery line 400: nitrogen purge line
500: drip tray 600: smoke detector
700: PLC 800: HMI PC
900: DCS 1000: casing

Claims (12)

In the LNG bunkering station module for small ships,
a casing 1000 forming an exterior of the LNG bunkering station module for small ships;
LNG supply line 200 for supplying LNG supplied from the outside to the LNG fuel tank (T) provided in the ship;
a first cryogenic valve installed on the LNG supply line 200 to control the flow rate of the supplied LNG;
an LNG boil-off gas recovery line 300 for discharging the LNG boil-off gas generated from the LNG fuel tank (T) to the outside;
a second cryogenic valve installed on the LNG boil-off gas recovery line 300 to control the flow rate of the recovered boil-off gas; and
and a nitrogen purge line 400 for purging by injecting nitrogen gas into the LNG supply line 200 or the LNG boil-off gas recovery line 300,
The first cryogenic valve is a first double block valve device (Double Block and Bleed valve, 210) comprising a first shut-off valve, a second shut-off valve and a first bleed valve,
The second cryogenic valve is a second double block valve device 310 comprising a third shut-off valve, a fourth shut-off valve and a second bleed valve,
The first bleed valve of the first double block valve device 210 is connected to the LNG drain pipe 211,
Leak detectors 240 and 440 for detecting LNG or BOG leaking on the LNG supply line 200 or the LNG BOG recovery line 300 are included,
a first pressure transmitter 220 connected to the LNG supply line 200 to sense the pressure of the LNG supply line 200;
a first temperature transmitter 230 connected to the LNG supply line 200 to sense the temperature of the LNG supply line 200;
a second pressure transmitter 320 connected to the LNG boil-off gas recovery line 300 to sense the pressure of the LNG boil-off gas recovery line 300; and
and a second temperature transmitter (330) connected to the LNG boil-off gas recovery line (300) to sense the temperature of the LNG boil-off gas recovery line (300). The method of claim 1,
a fire detector 600 for detecting a fire inside or around the casing 1000; and
LNG bunkering station module for small ships, characterized in that it includes a fire fighting facility (Fire Fighting, 100) for suppressing a fire. 3. The method of claim 2,
The LNG bunkering station module for small ships, characterized in that it further comprises a fire extinguishing material storage tank (120) in which the fire extinguishing material of the firefighting equipment (100) is stored. 4. The method of claim 3,
The fire detector 600 includes any one or more of a flame detector and a combustible gas detector,
The firefighting equipment is an LNG bunkering station module for small ships, characterized in that it includes a nozzle spray for spraying a fire extinguishing agent. delete delete 3. The method of claim 2,
The fire detector 600 , the leak detector 240 , 440 , the first pressure transmitter 220 , the first temperature transmitter 230 , the second pressure transmitter 320 and the second temperature transmitter 330 . ) receives a detection signal from, and a PLC (Programmable Logic Controller, 700) for controlling the firefighting equipment 100, the first double block valve device 210 or the second double block valve device 310 to the received detection signal LNG bunkering station module for small ships, characterized in that it further comprises. The method of claim 1,
An LNG bunkering station module for small ships, characterized in that a drip tray (500) is provided below the LNG supply line (200) or below the LNG boil-off gas recovery line (300). The method of claim 1,
An LNG bunkering station module for a small ship, characterized in that it comprises an inert fluid spray for protecting the hull from LNG by spraying the fluid to form a curtain. An LNG fuel-powered small vessel equipped with an LNG bunkering station module for a small vessel according to claim 1, 2, 3, 4, 7, 8 or 9. 11. The method of claim 10,
The LNG bunkering station module is an LNG fuel-propelled small vessel, characterized in that it is provided on the upper deck (upper deck) or in the pilot station hatch (pilot station hatch). 11. The method of claim 10,
The LNG fuel-powered small vessel is an LNG-fueled small vessel, characterized in that less than 500 tons.

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