KR101924171B1 - Ship containing insulated cargo tank - Google Patents

Abstract

Provided is a ship having an insulated cargo tank, in which a leaking state and a leaked position of the cargo tank are checked by a cooled inert gas, and an insulation efficiency of the cargo tank is improved, without using a separate coolant. The ship comprises: a hull; a cargo tank including a first wall formed in the hull to enclose a space for receiving a liquefied natural gas, a second wall spaced apart from the first wall to enclose the outside of the first wall, and a third wall spaced apart from the second wall to enclose the outside of the second wall, in which gaps between the first and second walls and the second and third walls are filled with an inert gas to form a first insulation portion and a second insulation portion; a gas supply unit for supplying the inert gas to the first and second insulation portions; a heat exchanger for heat-exchanging a natural gas discharged from the cargo tank to cool the inert gas; and a monitoring unit for monitoring a value measured by first and second temperature sensors.

Description

[0002] Ship containing insulated cargo tanks [0003]

The present invention relates to a ship including a cold storage window, and more particularly, to a ship capable of detecting a leakage of a liquefied natural gas contained in a cargo hold due to breakage of a cargo hold and detecting an accurate leak position, To a ship including a cold storage window capable of improving the heat insulation efficiency.

Natural gas is a fossil fuel buried in the ground in the form of gas, which is gas energy mainly composed of methane. Natural gas is generally compressed at a temperature of minus 163 ° C to about 600 ° C and is transported in a liquefied state. It can be used to remove dust, sulfur and nitrogen in the liquefaction process, and is a pollution-free clean fuel that rarely generates pollutants when it is burned . Therefore, the demand for liquefied natural gas is increasing.

The liquefied natural gas is generally transported from the mountain to the destination through the sea using a liquefied natural gas carrier. In order to safely store liquefied natural gas, which is a cryogenic liquid, it is necessary to maintain an extremely low temperature condition. In order to prevent the extremely low temperature liquefied natural gas from leaking through the defective portion of the cargo hold to damage the hull, Should be confirmed.

According to the prior art, in order to detect the leakage of the cargo hold in the transportation of the liquefied natural gas, the pressure of the gas introduced into the heat insulating space was measured to check whether the cargo hold leaked. In this case, There is a problem that it is difficult to do. In addition, although it takes a long time to arrive at the place of demand, there has been a problem that the insulated gas at room temperature is used, so that it is not possible to provide a cooling effect to the cargo window itself. Therefore, there is a need for a technology capable of accurately grasping the leakage point and improving the refrigerating effect of the cargo hold without using a separate refrigerant during the transportation time.

Korean Patent Publication No. 10-2008-0093541 (October 22, 2008)

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a liquefied natural gas- .

The technical objects of the present invention are not limited to the technical matters mentioned above, and other technical subjects not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a ship including a cold storage window, the ship including: a hull; and a hull enclosing the liquefied natural gas formed in the hull, A first wall, a second wall spaced from the first wall and surrounding the first wall, and a third wall spaced apart from the second wall and surrounding the first wall, the first wall, A second wall and a third wall, and a first insulation and a second insulation formed on the first insulation and the second insulation, respectively, and an inert gas is filled between the second and third walls; A heat exchanging unit for exchanging heat with the natural gas discharged from the cargo hold to cool the inert gas; a first temperature sensor for measuring the temperatures of the first and second heat insulating units; And a monitoring unit monitoring the measured values of the first temperature sensor and the second temperature sensor.

Further comprising: a first conduit communicating with the accommodation space to discharge the natural gas; and a second conduit connecting the gas supply unit to the first and second heat insulating units to supply the inert gas, May exchange heat between the first conduit and the second conduit.

A plurality of the first temperature sensor and the second temperature sensor may be disposed at different positions inside the first and second heat insulating portions.

The monitoring unit may recognize a change in the temperature value of each of the plurality of first temperature sensors or the plurality of second temperature sensors to determine a leakage position of the liquefied natural gas.

The monitoring unit may determine that the cargo window is damaged when a temperature change is detected in at least one of the first and second heat insulating units.

In the ship including the cold storage window according to the present invention, the cooled inert gas is introduced into each of the heat insulating portions, the leakage position of the liquefied natural gas can be grasped through the temperature change sensed by each heat insulating portion, There is an advantage that the heat insulating efficiency of the cargo hold can be improved without using it.

1 is a schematic view of a ship including a cold storage window according to an embodiment of the present invention.
2 is an enlarged view of a portion A in Fig.
Fig. 3 is an enlarged view of the portion B in Fig. 1 enlarged.
4 is a view illustrating a flow direction of an inert gas of a ship including a cold storage window according to an embodiment of the present invention.
FIG. 5 is a graph showing temperatures depending on leakage points of a ship including a cold storage window according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

In the present specification, the terms 'shear' and 'rear end' may be distinguished based on the direction of flow of fluid (inert gas or natural gas). The term 'shear' refers to the side of the fluid entering or connected to it, and the term 'back' refers to the side or connection of the fluid from which the fluid is discharged. For example, an inlet side or a connected portion of a fluid flowing device, a component portion, a pipeline or the like can be expressed by the front end of the device, the component portion, the pipeline, and the like, , And the rear end of the pipeline. Means that they are arranged or connected at the inlet side, and those arranged at the rear end or connected to the front end may be disposed or connected at the outlet side.

Hereinafter, with reference to FIG. 1 to FIG. 4, a ship including a cold storage window according to an embodiment of the present invention will be described in detail.

1 is an enlarged view of a portion A of FIG. 1, FIG. 3 is an enlarged view of a portion B of FIG. 1, and FIG. And FIG. 4 is a schematic view showing a flow direction of an inert gas and a natural gas of a ship including a cold storage window according to an embodiment of the present invention.

Referring to FIG. 1, a ship 1 including a cold storage window according to an embodiment of the present invention can detect the leakage of a cargo hold containing liquefied natural gas and at the same time add a cooling effect to the cargo hold, A first wall 210 surrounding the hull 100 and a receiving space 250 formed in the hull to receive liquefied natural gas and a second wall 210 surrounding the first wall 210. [ A second wall 220 spaced apart from the second wall 220 and a third wall 230 spaced apart from the second wall 220 and surrounding the first wall 210 and the second wall 220 A cargo window 200 in which an inert gas N is filled between the second wall 220 and the third wall 230 to form a first adiabatic part 260 and a second adiabatic part 270, A gas supply unit 300 for supplying the inert gas N to the first and second heat insulating units 260 and 270, A first temperature sensor 510 for measuring the temperatures of the first and second heat insulating parts 260 and 270, respectively, a heat exchanging part 400 for cooling the inert gas N by heat exchange with gas NG, A second temperature sensor 520 and a monitoring unit 600 for monitoring the measured values of the first temperature sensor 510 and the second temperature sensor 520.

With such a configuration, the cargo hold 200 can function as a cold storage window that can efficiently maintain the cold air of the liquefied natural gas accommodated in the accommodation space 250, and at the same time recognizes the change in the temperature value of each heat insulating portion, It is possible to grasp the leakage position of the gas.

Hereinafter, the structure of the ship 1 including the cold storage window and the method of determining the breakage of the cargo hold will be described in detail with reference to the respective drawings.

1, a ship 1 including a cold storage window includes a hull 100, a cargo window 200, a gas supply unit 300, a heat exchange unit 400, a first temperature sensor 510, A temperature sensor 520, and a monitoring unit 600.

The hull 100 is a hull of a general liquefied natural gas carrier, and a cargo window 200 for storing liquefied natural gas (LNG) is formed inside the hull 100.

1 and 2, a cargo hold 200 is formed inside the hull to receive liquefied natural gas (LNG) and includes a first wall 210, a second wall 220, and a third wall 230 ). The first wall 210 is the innermost wall of the cargo hold 200 and the third wall 230 is the outermost wall of the cargo hold 200, The space enclosed by the wall 210 becomes the accommodation space 250. The first wall 210 and the third wall 230 are spaced apart from each other and the first wall 210 and the third wall 230 are in contact with the hull of the third wall 230, 220 may be located. That is, the first wall 210, the second wall 220, and the third wall 230 may be spaced apart from each other, and a space may be formed between the walls, and each space may be used as a heat insulating portion .

A first heat insulating portion 260 is formed between the first wall body 210 and the second wall body 220 and a second heat insulating portion 270 is formed between the second wall body 220 and the third wall body 230 do. The first insulating portion 260 and the second insulating portion 270 are the places where the cooled inert gas N flows as described later and are moved by the flow of the cold inert gas N to the first wall 210, The wall 220, and the third wall 230 can maintain a constant cool air temperature, so that the cargo window 200 can serve as a cold storage window. This will be described later in detail.

A plurality of first temperature sensors 510 and second temperature sensors 520 may be disposed inside the first and second thermal insulation units 260 and 270, respectively.

The first temperature sensor 510 may be installed in the first wall 210 or the second wall 220 of the first thermal insulation unit 260 and the second temperature sensor 520 may be installed in the second thermal insulation unit 270, The second wall 220 or the third wall 230 of the main body. It is shown in the drawings that the first and second heat insulating parts 260 and 270 are disposed on the second wall body 220, but the present invention is not limited thereto.

A plurality of first temperature sensors 510 and second temperature sensors 520 are arranged at regular intervals to measure the temperature of the first temperature sensor 510 or the second temperature sensor 520, Recognize temperature value changes. That is, a plurality of the first temperature sensor 510 and the second temperature sensor 520 are disposed in the first and second heat insulating portions 260 and 270, and a temperature value change occurs inside each heat insulating portion The position information of the point where the change occurs can be grasped through the position of the first temperature sensor 510 or the second temperature sensor 520 for detecting the change. The first temperature sensor 510 or the second temperature sensor 520 installed at the position where the leakage occurs locally first changes the temperature locally so that the leakage is detected by sensing the local temperature will be.

An infrared thermometer may be used as the first temperature sensor 510 or the second temperature sensor 520. However, the infrared thermometer may be applied to any type of device that can function as a temperature sensor, .

The temperatures measured by the first temperature sensor 510 and the second temperature sensor 520 can be monitored in real time through the monitoring unit 600 connected to the first temperature sensor 510 and the second temperature sensor 520 have.

The monitoring unit 600 can recognize a change in the temperature value of the measured temperature of the plurality of first temperature sensors 510 or the plurality of second temperature sensors 520 to determine whether leakage has occurred in the cargo window 200, Further, the position where the leakage occurs is grasped. That is, the monitoring unit 600 recognizes the change in the temperature of the first temperature sensor 510 or the second temperature sensor 520 to detect a change in the temperature of the first and second temperature sensors 510, It is possible to detect that the breakage of the cargo window 200 has occurred by sensing the temperature change. If the infrared thermometer is applied to the first temperature sensor 510 or the second temperature sensor 520, the first and second heat insulating parts 260 and 270 may be connected to the monitoring part 600, And may be displayed on the monitoring unit 600 in a color corresponding to the temperature of the inert gas N. [ Accordingly, when the leakage occurs, the color change can be immediately recognized on the monitoring unit 600, and the leakage position can be grasped visually immediately.

While liquefied natural gas is stored and carried in the hold 200, some of the liquefied natural gas is vaporized to produce natural gas. Accordingly, the first channel 410 is formed at one side of the cargo hold 200 to communicate with the accommodation space 250 to discharge the natural gas.

The gas supply unit 300 and the heat exchanging unit 400 may be disposed outside the cargo hold 200.

The gas supplying part 300 serves to supply the inert gas N to the first and second heat insulating parts 260 and 270, respectively. The gas supply unit 300 may generate or store the inert gas N.

The inert gas N may be supplied to the first heat insulating portion 260 and the second heat insulating portion 270 as soon as the inert gas N is generated. Meanwhile, the generated inert gas N may be temporarily stored, And the second heat insulating portion 270, as shown in FIG. That is, although not shown, the gas supply unit 300 may include both an inert gas generator (not shown) and an inert gas storage tank (not shown).

The inert gas N is supplied to the first heat insulating portion 260 or the second heat insulating portion 270 and flows so that the first heat insulating portion 260 and the second heat insulating portion 270 can provide a heat insulating function. do. The inert gas (N) is chemically very stable and has low reactivity and does not cause any other chemical reaction. Also, it has low thermal conductivity and is effective for insulation. As the inert gas (N), helium gas, neon, argon, krypton, xenon, and the like can be used. Preferably, a nitrogen gas (N ₂ ) is used as the inert gas (N) to be supplied to the first heat insulating portion 260 and the second heat insulating portion 270.

The gas supply part 300 may have a second channel 420 formed on one side thereof and may be connected to the first and second heat insulating parts 260 and 270 and may be connected to the first heat insulating part 270 through the second channel 420. [ The inert gas is supplied to the first and second heat insulating portions 260 and 270, respectively. One side of the second conduit 420 is connected to the gas supply unit 300 and the other side is connected to the first and second heat insulating units 260 and 270. At this time, the tube connected to the gas supply part 300 and flowing into the heat exchanging part 400 to be described later is taken out of the second inlet pipe 420a and the heat exchanging part 400 and discharged through the first insulating part 260 and the second insulating And the second outlet pipe 420b are connected to each other.

1 and 3, the heat exchanging unit 400 is configured to heat the inert gas N supplied from the gas supplying unit 300 to a predetermined temperature before the inert gas N is supplied to the first heat insulating unit 260 and the second heat insulating unit 270, The inert gas N that has passed through the heat exchanging part 400 is supplied to the first and second heat insulating parts 260 and 270 in a cooled state, do.

That is, the heat exchanging part 400 is provided with the first channel 410 and the second channel 420 while the natural gas flows through the first channel 410 and the inert gas N flows through the second channel 420, Respectively. The heat exchanging part 400 may be formed separately from the gas supplying part 300 so as to surround the channel through which the inert gas N flows. However, the heat exchanging part 400 is not limited to the gas supplying part 300, Or may be formed in a shape that encloses an inert gas storage tank (not shown) itself. As described above, the heat exchanging unit 400 is applicable to any structure that can cool the inert gas N supplied to the first and second heat insulating units 260 and 270 through heat exchange.

The heat exchanging unit 400 is configured such that the natural gas continuously flows through the first inlet pipe 410a and flows out through the first outlet pipe 410b and the inert gas N flows through the second inlet pipe 420a Exchanges heat with the natural gas NG and flows out through the second outlet pipe 420b to be supplied to the first and second heat insulating parts 260 and 270 . An inlet valve 421 may be installed in the second outlet pipe 420b and an inert gas introduced into the first and second heat insulating portions 260 and 270 may be adjusted by controlling the opening and closing of the inlet valve 421, N) can be adjusted.

When the cooled inert gas N is supplied to the first heat insulating portion 260 and the second heat insulating portion 270, the first heat insulating portion 260 and the second heat insulating portion 270 heat the cooled inert gas N, As shown in Fig. When the inert gas N is filled in the first and second heat insulating portions 260 and 270 and a certain pressure is formed within the allowable range, the inlet valve 421 is closed and the first and second heat insulating portions 260 and 260 The pressure formed on the double-layered portion 270 can be kept constant.

At this time, if the inlet valve 421 is closed, the heat exchanger 400 can serve as a buffer tank. That is, when the inert gas N is not supplied to the first or second heat insulating portion 260 or 270, a certain amount of the inert gas N may be stored in the heat exchanging portion 400, The inert gas (N) can be stored in a pre-cooled state. Therefore, when the inlet valve 421 is opened again and the inert gas N is supplied to the first heat insulating portion 260 and the second heat insulating portion 270, it is possible to quickly supply the inert gas N in the cooled state have.

At this time, a first discharge pipe 261 and a second discharge pipe 271, which communicate with the outside of the hull, may be formed at one side of the first heat insulating portion 260 and the second heat insulating portion 270, respectively.

If the inert gas N is excessively introduced so as to apply a pressure equal to or higher than the permissible pressure within the first adiabatic portion 260 or the second adiabatic portion 270, The inert gas N can be discharged into the pipe 271 to lower the pressures of the first and second heat insulating portions 260 and 270 to within the allowable range.

For example, when a certain pressure or more is applied to the first heat insulating portion 260, the first safety valve 262 provided at the rear end of the first discharge pipe 261 is opened to discharge the inert gas N to the first discharge And discharged to the pipe 261 to lower the pressure of the first heat insulating portion 260. Similarly, even when a certain pressure or more is applied to the second adiabatic portion 270, the second safety valve 272 provided at the rear end of the second discharge pipe 271 is opened, It is possible to lower the pressure of the second adiabatic part 270 by discharging it to the second heat insulation part 271. The inert gas N discharged through the first discharge pipe 261 and the second discharge pipe 271 can be discharged to the atmosphere. The first safety valve 262 or the second safety valve 272 may be manually opened or closed according to the pressures of the first and second heat insulating portions 260 and 270, . That is, when a pressure exceeding the allowable range is formed, the inert gas N may be automatically opened to discharge the inert gas N, or automatically closed when the pressure is returned to within the permissible range.

The first discharge pipe 261 and the second discharge pipe 271 may be formed in the first heat insulating portion 260 and the second heat insulating portion 270 so that the first heat insulating portion 260 and the second heat insulating portion 270 may be formed in the first heat insulating portion 260 and the second heat insulating portion 270, It is possible to efficiently adjust the pressure of the pressure chamber 270 in accordance with the situation.

4, the inert gas N supplied through the gas supply unit 300 is supplied to the first and second heat insulating units 260 and 270 through the second channel 420. More specifically, the inert gas N at room temperature supplied from the gas supply unit 300 flows into the heat exchanging unit 400 through the second inlet pipe 420a and is cooled while passing through the heat exchanging unit 400 Heat exchange with natural gas occurs. Natural gas NG is a natural gas that is vaporized in the cargo hold 200. Part of the natural gas discharged through the first channel 410 flows through the first inlet pipe 410a to the heat exchanger 400 And the inert gas (N) at room temperature is cooled. At this time, as a method for increasing the heat exchange efficiency between the inert gas N and the natural gas NG, it is preferable to increase the residence time in which the inert gas N flows in the second channel 420, The length of the first conduit 410 and the length of the second conduit 420 may be extended to increase the heat exchange area.

The natural gas having flowed through the heat exchanging unit 400 flows out of the heat exchanging unit 400 through the first outlet pipe 410b and joins with the natural gas of the first pipe 410 again.

The cooled inert gas (N) flows into each of the first heat insulating portion (260) and the second heat insulating portion (270). The cooled first inert gas N flowing into the first heat insulating portion 260 is affected by the temperature of the receiving space 250 and is introduced into the first heat insulating portion 260 through the first heat insulating portion 260, Lt; RTI ID = 0.0 > 260 < / RTI > The cooled inert gas N flowing into the second adiabatic portion 270 flows to the second adiabatic portion 270 at a higher temperature than the inert gas N contained in the first adiabatic portion 260 do. The first temperature sensor 510 and the second temperature sensor 520 measure the temperature values formed in the first and second heat insulating portions 260 and 270, respectively.

Hereinafter, a description will be given in more detail of how a temperature change is sensed in at least one of the first and second heat insulating portions of a ship including the cold storage window of the present invention to recognize the breakage of the cargo hold with reference to FIG.

FIG. 5 is a graph showing temperatures depending on leakage points of a ship including a cold storage window according to an embodiment of the present invention.

5A is a sectional view showing the state where the cooled inert gas N flows into the first and second heat insulating parts 260 and 270 and flows into the receiving space 250, 260, and the second heat insulating portion 270, respectively.

If the first wall 210 is defective and the liquefied natural gas LNG flows into the first thermal insulation unit 260, the first temperature sensor 510 installed inside the first thermal insulation unit 260 And the monitoring unit 600 recognizes the change in the temperature value of the first temperature sensor 510 and grasps the leakage state of the liquefied natural gas. That is, as shown in FIG. 5 (b), when the first wall 210 is defective and the liquefied natural gas leaks, the temperature of the first heat insulating portion 260 drops. At this time, the plurality of first temperature sensors 510 and the second temperature sensors 520 are assigned unique numbers, and the first temperature sensor 510 has a first temperature The leakage position of the first wall 210 can be grasped through the location information of the first temperature sensor 510 having the corresponding unique number through the unique number of the sensor 510. As the temperature of the first adiabatic part 260 is lowered, the inert gas N contained in the second adiabatic part 270 is also slightly influenced and the temperature can be reduced.

5C is a graph showing the temperature change when the second wall 220 is broken. When a defect is generated in the second wall 220, The inert gas N is introduced into the second adiabatic portion 270 and the inert gas N of the second adiabatic portion 270 and the inert gas N of the first adiabatic portion 260 are mixed with each other Temperature value. That is, the first temperature sensor 510, which is closest to the position where the defect of the plurality of first temperature sensors 510 occurs, detects that the temperature of the first thermal isolator 260 slightly increases, and the second thermal isolator 270 And the second temperature sensor 520 closest to the position where the defect of the plurality of second temperature sensors 520 is located, the first temperature sensor 510 and the second temperature sensor 520 The monitoring unit 600 recognizes a change in the temperature of the second wall 220 and detects that the second wall 220 has a defect.

FIG. 5 (d) is a graph showing a change in temperature when breakage occurs in both the first wall 210 and the second wall 220. 5D, when a defect occurs in both the first wall 210 and the second wall 220, the liquefied natural gas flows from the receiving space 250 into the first heat insulating portion 260 and the second heat insulating portion 260, The first heat insulating portion 260 and the second heat insulating portion 270 may be caused to flow into the heat insulating portion 270, That is, the temperature of the first adiabatic part 260 and the second adiabatic part 270 is measured through the plurality of first temperature sensors 510 and the plurality of second temperature sensors 520, The monitoring unit 600 recognizes the first temperature sensor 510 or the second temperature sensor 520 in which the temperature value of the sensor 510 or the plurality of second temperature sensors 520 has changed, The first temperature sensor 510 or the second temperature sensor 520 detects a temperature change of at least one of the first and second thermal sensors 510 and 520, The position where the liquefied natural gas has leaked can be accurately grasped by using the point information on which the temperature sensor 510 or the second temperature sensor 520 is installed.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

1: Ships
100: Hull 200:
210: first wall 220: second wall
230: third wall 250: accommodation space
260: first insulating portion 261: first discharge pipe
262: first safety valve 270: second heat insulating portion
271: second discharge pipe 272: second safety valve
300: gas supply part 400: heat exchange part
410: first conduit 410a: first inlet pipe
410b: first outflow pipe 420: second pipe
420a: second inlet pipe 420b: second outlet pipe
421: inlet valve 510: first temperature sensor
520: second temperature sensor 600:
N: Inert gas NG: Natural gas
LNG: Liquefied natural gas

Claims (5)

hull;
A first wall formed inside the hull to receive liquefied natural gas and enclosing a receiving space for receiving the liquefied natural gas, a second wall spaced apart from the first wall and surrounding the first wall, And a third wall spaced apart from the wall and surrounding the first wall and the second wall, and an inert gas is filled between the first wall and the second wall and between the second wall and the third wall to form a first adiabatic portion and a second adiabatic portion A cargo window formed with the portions respectively;
A gas supply unit for supplying the inert gas to the first adiabatic unit and the second adiabatic unit;
A heat exchanger for exchanging heat with the natural gas discharged from the cargo hold to cool the inert gas;
A first temperature sensor and a second temperature sensor for respectively measuring the temperatures of the first and second heat insulating portions; And
And a monitoring unit for monitoring the measured values of the first temperature sensor and the second temperature sensor. 2. The apparatus of claim 1, further comprising: a first conduit communicating with the accommodation space and discharging the natural gas; And
And a second conduit connecting the gas supply unit to the first and second heat insulating units to supply the inert gas,
And the heat exchanging part includes a cold cooling window for exchanging heat between the first conduit and the second conduit. The ship according to claim 1, wherein the first temperature sensor and the second temperature sensor each include a cold storage window in which a plurality of the first temperature sensor and the second temperature sensor are disposed at different positions inside the first and second heat insulating portions. 4. The apparatus of claim 3, wherein the monitoring unit includes a cold storage window for recognizing a change in temperature value according to each position of the plurality of first temperature sensors or the plurality of second temperature sensors, Ship. The ship according to claim 1, wherein the monitoring unit determines that the cargo hold is damaged when a temperature change is detected in at least one of the first and second heat insulating units.

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