KR20120032716A - Installation structure of cofferdam inner fittings for 2-row type tank and vessel having the same structure - Google Patents

Abstract

PURPOSE: A fitting installation structure in a cofferdam for two-row tanks and a ship having the same are provided to optimize the arrangement of fittings in a common cofferdam and simplify the installation of fittings. CONSTITUTION: A fitting installation structure in a cofferdam for two-row tanks comprises a common cofferdam(100), a temperature sensor, and a heating part. The common cofferdam interconnects the internal spaces of longitudinal and lateral cofferdam parts between two-row tanks. The temperature sensor is installed inside the common cofferdam and measures the inner temperatures of the longitudinal and lateral cofferdam parts. The heating part is installed inside the common cofferdam and turned on/off according to the temperature sensing signals of the temperature sensor.

Description

INSTALLATION STRUCTURE OF COFFERDAM INNER FITTINGS FOR 2-ROW TYPE TANK AND VESSEL HAVING THE SAME STRUCTURE}

The present invention relates to a ship design, and more particularly to a ship having a design installation structure and the structure inside the cofferdam for a two-row batch tank.

Natural gas is transported in gaseous form through onshore or offshore gas pipelines or to distant consumers while stored in LNG carriers in the form of liquefied natural gas (LNG). Liquefied natural gas is obtained by cooling natural gas at cryogenic temperatures (approximately -163 ° C), and its volume is reduced to approximately 1/600 of that of natural gas, making it well suited for long-distance transport through the sea.

Recently, the demand for floating offshore structures such as Liquefied Natural Gas-Floating Production Storage Offloading and LNG FSRU (Liquefied Natural Gas-Floating Storage and Regasification Unit) has been increasing. These floating offshore structures also have storage tanks or cargo holds for storing liquefied natural gas in cryogenic conditions.

Such cargo holds or storage tanks cause sloshing due to movement at sea.

The sloshing phenomenon refers to a phenomenon in which a liquid substance, ie, liquefied natural gas, flows in a storage tank when a vessel moves in various sea conditions, and the wall surface of the storage tank is severely impacted by sloshing.

This sloshing phenomenon inevitably occurs during operation, and thus, two rows of tanks have been devised to reduce the sloshing impact force on the storage tank.

Vessel 1 having a storage tank according to the prior art, as shown in Fig. 1 or 2, to reduce the effect of sloshing, empty space along the center line of each of the one or more storage tanks 2; By installing the central bulkhead structure 3 to form, an example is shown in which the internal space of each of the storage tanks 2 is divided into two spaces 2a and 2b by the central bulkhead structure 3.

Meanwhile, a cofferdam 4 (cofferdam) extending in the width direction (eg, transverse direction) of the ship 1 between each storage tank 2 along the bow direction (eg, longitudinal direction) of the ship 1. ) Is arranged.

Here, the cofferdam 4 serves to secondarily block the outflow of the liquefied natural gas due to damage to the tank as necessary. For this purpose, a device for raising the internal temperature of the cofferdam is required inside the cofferdam 4, and if such a device is not provided, the temperature of the structure is less than 50 degrees Celsius due to heat transfer from the liquefied natural gas to the cofferdam 4. It can be lowered to ~ 100 degrees, which causes damage to the hull due to the low temperature brittleness of the material.

Therefore, a device such as a temperature raising device is also required inside the central partition structure 3 of the storage tank 2 divided into two spaces 2a and 2b in the same manner as the cofferdam 4.

However, since the above-mentioned cofferdam or the central bulkhead structure is installed to cross and partition each other, the temperature raising device is separately installed inside the cofferdam and the central bulkhead structure, and thus the material consumption for the temperature rising device and the like is relatively high. There was a problem that the number of installation work and installation time is increased compared to the cofferdam for a conventional single-row batch tank.

In particular, since the cofferdam and the center bulkhead structure of the prior art are separated from each other in view of the space partition, it becomes difficult to optimize the design of the arrangement, heat transfer efficiency, operating efficiency, installation construction efficiency, etc. of the temperature raising device, With the increase in size, there is a disadvantage that the equipment or the temperature raising device can only be installed more inefficiently.

For example, since the internal spaces of the cofferdam or the central bulkhead structure are not connected to each other, the internal temperature of the cofferdam does not affect the internal temperature of the central bulkhead structure, and the thermal energy of either the cofferdam or the central bulkhead structure is different. As it is not smoothly transferred to one energy, energy consumption is relatively high compared to that of the internal spaces connected to each other.

Embodiments of the present invention provide a common space cofferdam interconnecting the inner space of the longitudinal cofferdam portion and the transverse cofferdam portion, the longitudinal heating portion and the transverse heating in the common space cofferdam It is possible to optimize the layout of equipment, including parts, temperature sensors and access ways, and to facilitate installation work.

According to an aspect of the present invention, a common space cofferdam which interconnects internal spaces of a longitudinal cofferdam part and a transverse cofferdam part between two rows of tanks, and is installed inside the common space cofferdam, Two rows including one or more temperature sensors for measuring the internal temperature of the directional cofferdam unit and the lateral cofferdam unit, and a heating unit installed inside the common space cofferdam to be turned on / off corresponding to the temperature measurement signal of the temperature sensor. A fitting installation structure inside the cofferdam for a batch tank can be provided.

According to another aspect of the present invention, there may be provided a vessel or floating offshore structure or equivalent storage facility having a design installation structure inside the cofferdam for a two-row batch tank.

According to the embodiment of the present invention, the installation or layout design of the equipment can be optimized based on the common space cofferdam, and the equipment installation can be easily performed, and the material usage can be optimized.

According to an embodiment of the present invention, a plurality of temperature sensors are provided in a common space cofferdam to reduce energy use by integrally performing operation control of a longitudinal heating unit and / or a lateral heating unit in response to a temperature measurement signal of a temperature sensor. At the same time, optimum temperature control can be performed.

1 is a plan view showing a storage tank of a vessel according to the prior art.
2 is a cross-sectional view of the storage tank of the ship shown in FIG.
Figure 3 is a plan view of the inner structure installation structure of the cofferdam for a two-row batch tank according to an embodiment of the present invention and a vessel having the structure.
4 is an enlarged view of a dotted rectangle A shown in FIG. 3.
5 is a cross-sectional view of the line BB shown in FIG. 4.

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

Figure 3 is a plan view of the inner structure installation structure of the cofferdam for a two-row batch tank according to an embodiment of the present invention and a vessel having the structure.

As shown in FIG. 3, an embodiment of the present invention is arranged in series along the fore and aft direction for each unit section of a two-row batch tank as indicated by the dotted rectangle A in a floating offshore structure or vessel 90. It includes one or more common space cofferdam (100).

As used herein, the term "ship" is not limited to meaning a structure that sails aquatic waters, but is used to include not only structures that sail aquatic waters, but also naval structures, such as FLNG, which float and perform operations in the water surface. . The vessel 90 of the present embodiment may be, for example, LNGC or FLNG, but the present invention is not limited thereto.

The common space cofferdam 100 may be arranged in series with the hull of the ship 90 by matching the extending direction of the longitudinal cofferdam part 110 with the bow and tail direction of the ship 90.

In addition, each of the longitudinal cofferdam unit 110 or the lateral cofferdam unit 120 is formed by using the inner wall surface forming plate member, the bottom plate member, the ceiling plate member constituting the horizontal or vertical direction except the interconnected portion It may be formed in a lattice case or cage structure.

In this case, the common space cofferdam 100 for each unit compartment may have a hollow T-shaped wall structure on a plane basis.

The common space cofferdam 100 may be disposed between the two-row arrangement tank 90 including the port arrangement tanks P1 to P5 and the starboard arrangement tanks S1 to S5, and the longitudinal cofferdam portion 110 may be disposed. And the internal space of the lateral cofferdam unit 120 may be interconnected.

4 is an enlarged view of the dotted rectangle A shown in FIG. 3, and FIG. 5 is a cross-sectional view of the line B-B shown in FIG. 4.

As shown in FIG. 4, an embodiment of the present invention is installed inside the common space cofferdam 100 and measures one or more internal temperatures of the longitudinal cofferdam part 110 and the transverse cofferdam part 120. It may include a temperature sensor (200, 210, 220, 230, 240).

In addition, the embodiment of the present invention is the heating unit 300, 310, installed inside the common space cofferdam 100 to be turned on / off in response to the temperature measurement signal of the temperature sensor (200, 210, 220, 230, 240) 320, 330).

Each heating unit 300, 310, 320, 330 may be composed of a planar heating heater, a heater unit, a band heater (bend heater) and the like. The heater unit may be configured as a heating means that satisfies an industrial heater standard such as a fin tube.

Here, the fin tube type may mean a heating coil or a heating means in which a thin fin or a thin disk is closely attached to the outer diameter of the coil.

Further, an embodiment of the present invention utilizes a ship control system (not shown) that is provided in a floating offshore structure or a ship, and includes a temperature sensor 200, 210, 220, 230, 240, and a heating unit 300, 310. , 320, 330, the electronic valve 400, and the like may be configured to be controlled by a known temperature control or heating control program stored in a ship control system.

In general, the ship control system receives status signals (eg, temperature measurement signals, etc.) related to various pressures, temperatures, and levels associated with engines, generators, cargo holds, ship fuel tanks, and heating units, such as engines of ship engines, and sends them to users of the control room. It enables to accurately understand the operating status, generates an alarm when an error occurs on the graphic screen, and automatically controls the control object by a predetermined control program, or performs a remote control process if necessary. The vessel term may be understood as an Alarm Monitoring System (AMS) or an Integrated Control & Monitoring System (ICMS).

In addition, the temperature sensor 200 may be installed based on any one of a horizontal plate member or a vertical plate member or a bottom plate member or a ceiling plate member of the longitudinal cofferdam unit 110 or the transverse cofferdam unit 120.

The temperature sensor 200 may include at least one first temperature sensor disposed while maintaining a predetermined spacing interval along the height direction of the ship in the inner space of the side in which the longitudinal cofferdam part 110 and the lateral cofferdam part 120 are interconnected. 210, one or more second temperature sensors 220, 230 disposed at the upper end and the lower end of the port and / or starboard side of the transverse cofferdam unit 120 and the longitudinal opposite to the transverse cofferdam unit 120; One or more third temperature sensors 240 disposed at the upper end, the middle part, and the lower end of the end of the directional copper dam part 110 may be included.

In the present embodiment, the temperature sensors 210, 220, 230, 240 are described as being installed in the arrangement position as a plurality, the number of the temperature sensors (210, 220, 230, 240) is a sensing range, purification It may be installed in various numbers and arrangement positions in consideration of the drawings, etc., may not be limited to the number on the drawings.

For example, as shown in FIG. 5, the first temperature sensor 210 may be disposed in the height direction of the ship in the inner space of the side in which the longitudinal cofferdam part 110 and the transverse cofferdam part 120 are interconnected. The heating unit 300, which may further include first-first, first-second, first-third, and first-fourth temperature sensors 211, 212, 213, and 214, and is installed in the lateral cofferdam unit 120. ) Can be configured to measure the temperature around the lateral heating unit 320 for each height of the vessel.

In addition, the third temperature sensor 240 is 3-1, 3-2 temperature sensor so that it can be disposed on the upper end, the middle and the lower end of the end of the longitudinal cofferdam 110, which is opposite to the transverse cofferdam It may further include 241, 242, may be configured to measure the temperature around the longitudinal heating unit 310 of the heating unit 300 installed in the longitudinal cofferdam unit 110 for each height of the vessel. .

Thus, since the present embodiment can measure the temperature by the height or position of the vessel, it is possible to control the operation of the heating unit 300 below to perform temperature control efficiently and accurately.

The heating unit 300 includes a longitudinal heating unit 310 installed on the inner wall surface of the longitudinal cofferdam unit 110, a lateral heating unit 320 installed on the inner wall surface of the transverse cofferdam unit 120, and the longitudinal A connecting tube connected to supply a heating medium (eg, a heating medium) of an external heat source (eg, a boiler) to the lateral heating unit 310 and the lateral heating unit 320, and the longitudinal heating unit The electronic valves 400, 401, and 402 installed in the connection pipe may be included to supply or block the fruit toward the 310 and / or the lateral heating unit 320.

The connection pipe may be configured as a pipe line or a pipe structure for supplying a heat source by interconnecting the longitudinal heating part 310 and the lateral heating part 320 to be composed of one or more.

Since the longitudinal heating part 310 and the lateral heating part 320 are interconnected through the connecting pipe, integrated operation control is possible by the ship control system.

The electronic valves 400, 401, 402 illustrated in FIG. 5 or the electronic valves 400, 420, 430 illustrated in FIG. 3 may be configured to be opened and closed controlled by the aforementioned vessel control system.

Meanwhile, in the present embodiment, the electronic valves 400, 401, 402, 420, and 430 correspond to the temperature measurement signals of the temperature sensors 200, 210, 211, 212, 213, 214, 220, 230, 240, 241, and 242. In accordance with the control of the opening and closing of the heating unit 300, 310, 320, 330 may be provided in the ship control system a temperature controller (not shown) that can control the operation or stop.

Meanwhile, multiple signal processing means such as a data logger is further interposed between the temperature sensors 200, 210, 211, 212, 213, 214, 220, 230, 240, 241 and 242 and the temperature controller. Fast and accurate temperature control can be performed.

Referring to FIG. 4, the lateral heating units 320 and 330 of the heating unit 300 may be configured to serve as main heaters of the common space cofferdam 100, and the longitudinal heating unit 310 may be used. It may be configured to play a role as a sub heater of the common space cofferdam (100).

Accordingly, the longitudinal heating unit 310 is controlled by the auxiliary temperature control means of the lateral heating unit 320 so that the internal temperature of the common space cofferdam 100 reaches or maintains the target temperature. By adjusting or calibrating the temperature of 100), energy usage can be optimized.

In addition, the present embodiment may further include access roads 500, 510, and 520 installed on the longitudinal cofferdam part 110 and / or the horizontal cofferdam 120 part as other design items.

In this case, since the longitudinal cofferdam unit 110 and / or the lateral cofferdam 120 are interconnected, the installation points of the access paths 500, 510, and 520 can be relatively reduced compared to the case where the longitudinal cofferdam unit 110 and / or the transverse cofferdam 120 are not connected to each other. In this way, the usage of materials can be optimized according to the installation of equipment.

This present embodiment may be applied as any structure having a cofferdam for a two-row batch tank as mentioned above, such as a ship or floating offshore structure or underwater storage structure or above ground storage facility or equivalent storage facility.

That is, while the embodiments of the present invention have been described with reference to a specific object (for example, a ship or a floating marine structure, etc.), various modifications, changes, or modifications within the spirit of the present invention and the appended claims are described. As such, the foregoing description and drawings are to be construed as illustrating the invention rather than as limiting the technical spirit of the invention.

100: common space cofferdam 110: longitudinal cofferdam
120: transverse cofferdam 200: temperature sensor
300: heating unit 400: electronic valve
500: ramp

Claims (6)

A common space cofferdam which interconnects the internal spaces of the longitudinal cofferdam section and the transverse cofferdam section between the two-row tanks;
At least one temperature sensor installed inside the common space cofferdam and configured to measure internal temperatures of the longitudinal cofferdam part and the transverse cofferdam part;
And a heating unit installed inside the common space cofferdam to be turned on / off corresponding to the temperature measurement signal of the temperature sensor.
Equipment installation structure inside cofferdam for two-row tanks.
The method of claim 1,
The common space cofferdam
The longitudinal direction of the cofferdam portion is arranged in series with the hull of the ship, while being aligned with the bow and tail direction of the ship.
Equipment installation structure inside cofferdam for two-row tanks.
The method of claim 1,
The temperature sensor is
At least one first temperature sensor disposed while maintaining a predetermined distance along the height direction of the vessel in an inner space of the longitudinal cofferdam portion and the lateral cofferdam portion interconnected;
At least one second temperature sensor disposed at an upper end and a lower end of the port and / or starboard side of the transverse cofferdam part;
And at least one third temperature sensor disposed at an upper end, an intermediate part, and a lower end of the end of the longitudinal cofferdam part opposite to the lateral cofferdam part.
Equipment installation structure inside cofferdam for two-row tanks.
The method of claim 1,
The heating unit
A longitudinal heating part provided on an inner wall surface of the longitudinal cofferdam part;
A lateral heating part provided on an inner wall surface of the lateral cofferdam part;
A connecting tube connected to supply the fruit of an external heat source to the longitudinal heating portion and the lateral heating portion,
An electronic valve provided in the connecting pipe for supplying or blocking the fruit toward the longitudinal heating section and / or the lateral heating section.
Equipment installation structure inside cofferdam for two-row tanks. The method of claim 1,
It further comprises an access road provided on the longitudinal cofferdam portion and / or the transverse cofferdam portion.
Equipment installation structure inside cofferdam for two-row tanks.
A ship having a design installation structure inside a cofferdam for a two-row tank arrangement according to any one of claims 1 to 5.

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