KR20150011439A - Floating marine structure and its temperature controlling method - Google Patents
Floating marine structure and its temperature controlling method Download PDFInfo
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- KR20150011439A KR20150011439A KR1020130086268A KR20130086268A KR20150011439A KR 20150011439 A KR20150011439 A KR 20150011439A KR 1020130086268 A KR1020130086268 A KR 1020130086268A KR 20130086268 A KR20130086268 A KR 20130086268A KR 20150011439 A KR20150011439 A KR 20150011439A
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- temperature
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- bor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
- B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
- B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
- B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
- B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63J—AUXILIARIES ON VESSELS
- B63J2/00—Arrangements of ventilation, heating, cooling, or air-conditioning
- B63J2/12—Heating; Cooling
- B63J2/14—Heating; Cooling of liquid-freight-carrying tanks
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- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
Description
The present invention relates to a floating structure and a method of controlling the temperature of the LNG storage tank. More particularly, the present invention relates to a floating structure capable of reducing the BOR (Boil-off Ratio) by reducing the heat transfer between the cofferdams and the LNG stored in the LNG storage tank Structures and temperature control methods.
In general, natural gas is transported in the form of gas through land or sea gas pipelines, or stored in a LNG carrier in the form of liquefied natural gas (hereinafter referred to as "LNG"), Lt; / RTI >
Such LNG is obtained by cooling natural gas to a cryogenic temperature, for example, approximately -163 DEG C, and its volume is reduced to about 1/600 of that of natural gas in a gaseous state, so that it is suitable for long distance transportation through the sea.
These LNGs are transported through LNG transporting vessels, transported through the sea, unloaded to landfill sites, carried on LNG RV (LNG Regasification Vessel), transported through the sea, reached to land requirements, recharged and unloaded as natural gas LNG carriers and LNG RVs are equipped with LNG storage tanks (also called "cargo holds") that can withstand the extreme temperatures of LNG.
In addition, demand for marine structures such as LNG FPSO (Floating, Production, Storage and Offloading) and LNG FSRU (Floating Storage and Regasification Unit) is gradually increasing, and LNG transport or LNG storage Tanks are included.
Here, the LNG FPSO is a marine structure used to directly liquefy natural gas produced from the sea and store it in a storage tank, and to transfer the LNG stored in the storage tank to the LNG transport if necessary.
LNG FSRU is an offshore structure that stores LNG unloaded from an LNG carrier in offshore water and stores it in a storage tank, and then supplies LNG to the demanding customers on demand.
These LNG storage tanks are divided into independent tank type and membrane type depending on whether the insulation for storing the LNG at a cryogenic temperature directly acts on the load of the cargo, The tank is divided into the MOSS type and the IHI-SPB type, and the membrane type storage tank is divided into the GT NO 96 type and the TGZ Mark III type.
Among the conventional LNG storage tanks, GT NO 96, which is a membrane type, has a primary barrier and a secondary barrier made of Invar steel (36% Ni) having a thickness of 0.5 to 0.7 mm, The primary sealing wall is located on the LNG side and the secondary sealing wall is located on the inner surface side of the hull so as to double-wrap the LNG.
A primary heat insulating wall is provided in a space between the primary sealing wall and the secondary sealing wall, and a secondary heat insulating wall is provided in a space between the secondary sealing wall and the inner hull. The primary heat insulating wall and the secondary insulating wall The walls minimize the transfer of heat from the outside of the LNG storage tank to the LNG.
Meanwhile, since the LNG stored in the LNG storage tank is stored at about -163 ° C, which is the vaporization temperature at normal pressure, when heat is transferred to the LNG, the LNG is vaporized and a boil off gas (hereinafter referred to as BOG) is generated.
In the case of membrane type LNG storage tanks, when cold LNG storage tanks are installed continuously, the temperature of the steel between them suddenly drops and brittle fracture can occur.
To prevent this, a space called a cofferdam is placed between the LNG storage tanks to prevent the low temperature damage of the LNG.
However, even if the coffer dam is installed, the temperature of the steel of the copper dam bulkhead contacting with the LNG cargo due to cryogenic LNG may fall below -60 ° C. Normal steel is damaged at low temperature brittleness when exposed to -60 ° C.
As a countermeasure, Copper Dam can be made of cryogenic material such as stainless steel or aluminum, but if the cryogenic material is used, the price of ship will increase sharply.
Therefore, when the copper dam and the LNG storage tank are installed, the temperature of the copper dam is controlled at 5 ° C. and the bulkhead of the copper dam is made of a relatively inexpensive steel which can withstand room temperature.
In the case of conventional LNG carriers, when the temperature of the cofferdams is less than 5 ℃, the heating system operates and always keeps 5 ℃ or more. Conventional LNG carriers are equipped with a glycol heating system or an electric heating system.
Therefore, conventional LNG carriers are always designed and operated at at least 5 ° C for the cofferdams, and BOR is also generated at these temperature conditions.
Currently, the LNG carrier market is sensitive to the BOR level at the contracting stage. For example, in the past, 0.15% BOR was a contract condition, but in recent years, 0.125%, 0.10% or 0.095% BOR has been proposed as a contract condition.
However, currently membrane type tanks are equipped with insulation walls in the cargo hold. Since the LNG cargo hold insulation wall must be capable of withstanding the load transferred from the LNG cargo to the cargo hold in addition to the insulation performance, there is a lot of research, design change, and cost increase when the insulation of the existing LNG cargo hold is changed to improve the insulation performance .
In fact, even if there is an LNG hold wall insulation wall satisfying 0.13% BOR, there is much research, time, and cost to reduce the BOR by 4% when 0.125% comes to the BOR requirement of the shipowner.
Also, even if there is an LNG cargo hold insulation wall that guarantees 0.103% BOR, if the shipowner presents a BOR of 0.10%, it is impossible to apply this LNG cargo hold and the LNG carrier can not be ordered. Currently, 1% of the market is able to compete in favor of shipbuilding if the BOR declines, which is the current LNG carrier market.
On the other hand, the development of the existing BOR reduction technology is to improve the performance of the LNG cargo hold insulation wall. At present, a small amount of BOR is required in the market, so the most discussed method is to increase the thickness of the LNG cargo hold.
However, increasing the thickness of the LNG hold reduces the volume of LNG storage. Alternatively, the size of the vessel increases to maintain the same hold volume.
Further, as the thickness of the cargo hold increases, the structure of the cargo hold is weaker, so research should be conducted to reinforce it.
Accordingly, it is an object of the present invention to reduce the BOR by reducing the control temperature of the cofferdams, and to reduce the BOR by controlling the cofferdam control temperature, which is controlled by the subzero temperature, And a method of controlling the temperature.
According to an aspect of the present invention, there is provided a coffer dam provided between a plurality of LNG storage tanks, wherein the plurality of LNG storage tanks are arranged in multiple rows in at least one of a longitudinal direction and a width direction of the hull, And a heating unit provided in the cofferdams for heating the cofferdams, wherein the cofferdams are controlled at a sub-zero temperature so that the BOR generated by the heat transfer between the COP dam and the LNG stored in the plurality of LNG storage tanks Wherein the temperature of the freezing structure is changed to the temperature of the heating furnace image of the heating unit.
The cofferdams comprising: a pair of bulkheads spaced apart from each other between the plurality of LNG storage tanks; And a space portion provided by the pair of bulkheads and the inner wall of the hull, and the sub-temperature can be changed to the image temperature by heating the pair of bulkheads with the heating portion.
When the bulkhead of the copper dam is made of a material that can withstand temperatures of -30 to 0 占 폚, the copper dam can be thermally changed in a range of -30 to 70 占 폚.
When the bulkhead of the copper dam is made of low-temperature steel capable of withstanding up to -55 占 폚, the copper dam can be thermally changed in the range of -55 to 70 占 폚.
When the fuel consumption of the floating structure is large, the temperature of the cofferdam is increased to increase the generation of boil-off gas (BOG) and used as fuel. When the fuel consumption of the offshore structure is small, The generation of the BOG can be reduced.
The temperature of the coffer dam can be controlled by an image by heating the coffer dam by the heating unit so that an operator can enter the inside of the coffer dam.
The temperature of the sub-subzero of the cofferdam can be changed to the temperature of the image by the high-temperature dry air supplied to the inside of the cofferdam.
When the internal pressure of the LNG storage tank is higher than the set pressure of the LNG storage tank and the internal pressure of the LNG storage tank is lower than the set pressure of the LNG storage tank, .
The floating structure may be any one selected from LNG FPSO, LNG FSRU, LNG transport, LNG RV and FLNG.
According to another aspect of the present invention, there is provided a method of controlling a COP dam disposed between a plurality of LNG storage tanks at a sub-zero temperature to increase the BOR generated by heat transfer between the COP dam and the LNG stored in the plurality of LNG storage tanks, off rate of the hull is lowered while the temperature of the sub-sea is changed by the heating of the hitting part provided on the hull to maintain the temperature of the image.
According to another aspect of the present invention, there is provided a method of controlling a COP dam, Controlling the coffer dam to a temperature of an image so that an operator enters the coffer dam controlled at a subzero temperature; And controlling the cofferdams to a sub-zero temperature when the operator exits the coffer dam.
The copper dam can be controlled in a temperature range of -55 to 70 캜.
Embodiments of the present invention can reduce the BOR (Boil-off Rate) generated by the heat transfer between the COP dam and the LNG stored in the plurality of LNG storage tanks by controlling the temperature of the copper damper at a low temperature, The control temperature is raised to increase the BOG and when the BOG is generated in a large amount, the control temperature can be lowered to adjust the BOG to be less. In order to inspect the inside of the copper dam, the operator enters the inside of the copper dam If necessary, the cofferdams can be controlled to the temperature of the image to enable the operator to enter the cofferdams.
1 is a side view schematically showing a state in which a coffer dam is installed in a floating type floating structure according to a first embodiment of the present invention.
2 is a sectional view taken along the line II-II in Fig.
3 is a sectional view taken along the line III-III in Fig.
FIG. 4 is a plan sectional view showing a state in which a coffer dam is provided between two rows of LNG storage tanks in the floating structure shown in FIG. 1. FIG.
5 is a sectional view taken along the line IV-IV in Fig.
6 is a table showing the steel grade specified by the IGC.
7 is a table showing a calculation result of the BOR generated by the temperature control of the copper dam in the first embodiment of the present invention.
8 is a view schematically showing a state in which a heating unit is provided in a floating structure in the first embodiment of the present invention.
9 is a view schematically showing a state in which a thermal insulating material is provided in a copper dam in a thermal insulation system of a floating structure according to a second embodiment of the present invention.
10 is a perspective view schematically showing a state in which a heat insulating material is provided in an area " A " in Fig.
11 is a perspective view schematically showing a state in which a heat insulating material is provided in a region " B " in Fig.
Fig. 12 is a view schematically showing a heat insulating material damage preventing member provided to prevent the heat insulating material from being damaged in the " C " area in Fig.
13 is a table showing calculation results of BOR generated by controlling the temperature of the copper dam by the heat insulating material shown in FIG.
FIG. 14 is a view schematically showing a state in which a bulkhead of a copper dam in a floating structure according to a third embodiment of the present invention is connected to an inner hull without extending to an outer hull.
Fig. 15 is a modified embodiment of Fig. 14 in which a copper dam is provided in place of the bulkhead shown in Fig. 14 and a heat insulating material is provided in the copper dam.
FIG. 16 is a table showing the calculation results of the BOR generated by manufacturing the bulkhead shown in FIG. 13 with a cryogenic material and controlling the temperature of the copper dam.
17 is a view schematically showing a gas supply unit in a floating type floating structure according to a fourth embodiment of the present invention.
18 is a table showing calculation results of the BOR generated by controlling the temperature of the coffer dam shown in FIG.
19 is a view schematically showing control of the temperature of the cofferdams according to the pressure change of the LNG storage tank in the floating structure according to the fifth embodiment of the present invention.
20 is a view schematically showing a state in which a heat insulating material is provided in a trunk deck space and a side passage in a thermal insulation system of a floating marine structure according to a sixth embodiment of the present invention.
21 is a table showing calculation results of the BOR generated by controlling the temperature of the inner hull adjacent to the trunk deck space and the side passages shown in Fig.
22 is a view schematically showing a state in which a thermal insulating material is provided in a ballast tank in a thermal insulation system of a floating structure according to a seventh embodiment of the present invention.
23 is a table showing the calculation result of the BOR generated by controlling the temperature of the inner hull in contact with the ballast tank.
In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention.
Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.
In this specification, the floating floating structure refers to a concept including all kinds of ships and various structures that are floated on the sea while having a storage tank for storing LNG, LNG FPSO (Floating, Production, Storage and Offloading) Floating Storage and Regulation Unit (FSRU), LNG carrier, and LNG RV (LNG Regasification Vessel).
1 is a side view schematically showing a state in which a copper dam is installed on a floating type floating structure according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II in FIG. 1, FIG. 4 is a plan sectional view showing a state in which a coffer dam is provided between two rows of LNG storage tanks in the floating structure shown in FIG. 1, and FIG. 5 is a cross- FIG. 6 is a table showing the steel grade specified by the IGC, and FIG. 7 is a table showing the steel grade of the BOR generated by the temperature control of the copper dam in the first embodiment of the present invention. FIG. 8 is a view schematically showing a state in which a heating unit is provided in a floating structure in the first embodiment of the present invention. FIG.
The present embodiment controls the
As shown in these drawings, the floating
The
In this embodiment, the
Specifically, conventionally, the temperature of the cofferdams is always maintained at 5 ° C or higher, which is a reason why when the temperature of the cofferdams is controlled to be lower than 5 ° C, the bulkhead of the copper dam using the steel grade A specified by IGC (11) is lower than 0 ° C and there is a risk of brittle fracture.
As described above, when the temperature of the cofferdams is maintained at 5 ° C or higher, the BOR occurs due to the heat transfer due to the temperature difference between the cofferdams and the LNG stored in the LNG storage tank T. For example, , The BOR of 0.1282 is calculated as shown in the table of Fig.
However, when the temperature of the
7, when the temperature of the
7, when the temperature of the
However, if the temperature of the
Also, the loss of LNG vaporized by the BOG can be prevented by the reduction of BOR, which can sufficiently offset the above-mentioned increase in cost.
As shown in Fig. 1, the
In this embodiment, the temperature of the
Specifically, when designing an LNG carrier, the LNG carrier should be designed to be free from problems even when the outside air temperature is -18 ° C and the seawater temperature is 0 ° C according to USCG conditions. If the
Therefore, conventionally, the temperature of the
However, in the present embodiment, unlike the conventional LNG carrier, the temperature of the
The
In the present embodiment, the above-described method of controlling the temperature of the
Since the
Particularly, when the
In the present embodiment, when the
1 and 3, when the
Furthermore, in this embodiment, as shown in Fig. 4, the
In this case, in the case of the
4, a pair of
The
The gas supply unit serves to prevent the
In this embodiment, the gas supply unit may be configured in the same manner as the gas supply unit 300 (see Fig. 17) of the fourth embodiment described later, and the gas branched from the gas supply line and supplied through the gas supply line is supplied to the copper dam A discharge piping provided in the
The supply pipe of the gas supply unit may be provided in a number corresponding to the
The discharge piping of the gas supply unit may be provided in a number corresponding to the
The valve of the
In this embodiment, the gas supplied to the gas supply line includes dry air, inert gas or N 2 gas, which is supplied to a conventional dry air / iner Gas generator.
Meanwhile, the present embodiment may include a
8, the
In addition, the
In the present embodiment, when a glycol is used as an antifreeze, 45% of glycol water having a freezing point of -30 ° C can be used.
A method of heating the glycol supplied to the
The glycol circulated by the glycol circulation pump is heated by the high temperature steam supplied from the boiler or the like in the glycol heater GH before being supplied to the
In this embodiment, the
On the other hand, when the temperature of the
9 is a view schematically showing a state in which a thermal insulating material is provided in a copper dam in a thermal insulation system for a floating marine structure according to a second embodiment of the present invention, and FIG. 10 is a view showing a state in which a heat insulating material is provided in the "A" FIG. 11 is a perspective view schematically showing a state in which a heat insulating material is provided in the "B" region in FIG. 9, FIG. 12 is a modified embodiment of the heat insulating material provided in the "C" 13 is a table showing calculation results of BOR generated by controlling the temperature of the copper dam by the heat insulating material shown in FIG.
The
As shown in FIG. 9, the
Specifically, when the outside temperature is high, for example, when the temperature of the outside air indicated by the IGC code is 45 ° C and the seawater temperature is 25 ° C, when the
However, if the
Now, the
That is, in this embodiment, the
In this embodiment, the
The panel-type heat insulating material includes styrofoam, and the styrofoam can be bonded to the
The foamed type heat insulating material includes a polyurethane foam, and the polyurethane foam can be injected and bonded to the
The nonwoven fabric type heat insulating material may be made of a polyester fiber material, a synthetic resin layer, or may be bonded to the
In the present invention, there is no limitation as to the type and installation method of the
In this embodiment, the
10, in the case of the
When the
In this embodiment, the
Specifically, FIG. 11 shows that the
That is, since the LNG storage tank T is in contact with only one direction and is in contact with the inner wall of the hull, it is preferable that the lowering of the temperature of the
However, as in the present embodiment, the
On the other hand, when the
Therefore, in this embodiment, as shown in Fig. 12, a heat insulating material damage preventing member can be provided to prevent the above-described
In this embodiment, the heat insulating material
The heat insulating material
Fig. 13 shows a reduction effect of the BOR by the installation of the heat insulating material and the temperature control of the coffer dam.
When the coffer dam is controlled at 5 캜 as in the conventional case, the BOR becomes about 0.1282. In this case, even if the control temperature of the glycol heating system is controlled to control the temperature of the copper dam, if the glycol heating is not performed, the copper dam may only drop to -10.87 ° C even at the lowest falling temperature.
Therefore, even if the
However, the BOR can be reduced by about 3.5 by installing the
The contents of the first embodiment described above can be applied to the present embodiment as it is.
14 is a view schematically showing a state in which the bulkhead of the copper dam in the floating structure according to the third embodiment of the present invention is connected to the inner hull only without extending to the outer hull, and Fig. 14 in which a copper dam is provided in place of the head and a heat insulating material is provided in the copper dam. Fig. 16 is a view showing a modification of the BOR generated by making the bulkhead shown in Fig. 13 as a cryogenic material and controlling the temperature of the copper dam. Fig.
The
14, the
In this embodiment, since the sealing and heat insulating unit SI and the
Therefore, in the present embodiment, the
Further, a pair of the
On the other hand, the
The
The
The
Further, the
The
The gas supply unit and the
The present embodiment is characterized in that the
However, the
15, two or more of the
On the other hand, in this embodiment, as shown in Figs. 14 and 15, the sealing and heat insulating unit SI may not be provided in the region where the
14, if the sealing and heat insulating unit SI are not provided in the area where the
In this case, the
FIG. 17 is a view schematically showing a gas supply unit in a floating structure according to a fourth embodiment of the present invention, and FIG. 18 is a diagram showing the calculation result of the BOR generated by controlling the temperature of the coffer dam shown in FIG. Table.
The floating
The present embodiment is different from the first embodiment in that it has a
In the floating structure of the present embodiment, the operator must periodically enter the
However, when the temperature of the
In this embodiment, the
For example, when the dew point temperature of the dry air generated in the LNG carrier is -40 ° C, the temperature of the
The technical means for supplying dry air having a low dew point temperature to the inside of the
When the temperature of the
17, the
In this embodiment, the dry air supplied to the gas supply line (AL) can be supplied from a dry air generator installed in a conventional LNG carrier, so that no additional cost is incurred for this facility.
In this embodiment, the dry air supplied to the
When personnel enter the
19 is a view schematically showing control of the temperature of the cofferdams according to the pressure change of the LNG storage tank in the floating structure according to the fifth embodiment of the present invention.
The insulation system 400 of the floating structure according to the present embodiment is provided between the plurality of LNG storage tanks T so that the plurality of LNG storage tanks T can be installed in at least one of the longitudinal direction and the width direction of the ship And a
That is, in this embodiment, in order to lower the BOR, the temperature of the
The control temperature may be set manually in consideration of the voyage conditions, etc., or may be automatically controlled by receiving a pressure signal from the LNG storage tank T. That is, when the pressure of the LNG storage tank T is high, since the BOG is excessively generated, control is performed so as to lower the set value of the control temperature. When the pressure is low, BOG is slightly generated. .
In this embodiment, in order to lower the BOR, the temperature of the
Specifically, it is necessary for the operator to enter the inside of the
At this time, if the
In the present embodiment, when the
In the present embodiment, when the
Hereinafter, a method of controlling the temperature of the copper dam to enter the inside of the
First, the temperature of the
Therefore, the step of heating the
Next, when the internal temperature of the
When the operator completes the internal inspection of the
As described above, the present embodiment can reduce the BOR by keeping the
The technical means for controlling the temperature of the
The present embodiment is different from the first embodiment in that the temperature of the
Specifically, in this embodiment, a pressure sensor PT capable of measuring the internal pressure of the LNG storage tank T is provided in the LNG storage tank T as shown in FIG. 19, The temperature of the
That is, when the pressure of the LNG storage tank T is increased, BOG is generated more than the BOG required for the floating structure, so that the setting temperature of the
In addition, the temperature of the
Specifically, if the speed of the floating structure is high and the fuel consumption is large, the control temperature of the
For example, a floating structure that controls the
On the other hand, when the speed of the floating floating structure is low and the fuel consumption is small, the control temperature of the
On the other hand, when the
In addition, the gas supply unit and the
20 is a view schematically showing a state in which a heat insulating material is provided in a trunk deck space TS and a side passage in a thermal insulation system of a floating marine structure according to a sixth embodiment of the present invention, And the calculation result of the BOR generated by controlling the temperature of the inner hull (IH) in contact with the trunk deck space (TS) and the side passage.
The
The present embodiment can lower the BOR by reducing the amount of heat penetration from the outside by lowering the temperature of the inner hull IH in contact with the trunk deck space TS and the side passages SP.
Particularly, when the navigation system is operated in the vicinity of the Arctic route or in the winter, the temperature of the inner hull (IH) in contact with the trunk deck space (TS) and the side passageway (SP) The BOR can be reduced.
The temperature of the inner hull IH in contact with the trunk deck space TS and the side passages SP is lowered by the
Particularly, since the side passage (SP) in contact with the trunk deck (TD) and the trunk deck (TD) is directly exposed to the external solar heat, the
As shown in the table of FIG. 21, when the temperature of the inner hull (IH) in contact with the trunk deck space (TS) and the side passage (SP) is not controlled as a result of numerical analysis of the actual LNG carriers, The temperature of the inner hull (IH) is about 35.3 ° C, and the BOR is calculated as 0.1346.
However, when the temperature of the inner hull IH in contact with the trunk deck space TS and the side passages SP is controlled to 0 占 폚 by applying the present embodiment, as shown in the table of Fig. 21, the BOR is 0.1296 Which is about 3.7% lower than that of the conventional method. It can be seen that the BOR can be reduced by using the low-cost
As another example, when the temperature of the inner hull (IH) in contact with the trunk deck space (TS) and the side passage (SP) is controlled to -25 ° C by applying the present embodiment, it is confirmed that the BOR is reduced by about 5.9% there was. It can also be seen that the use of the low-
20, the
The
In this embodiment, the
The present embodiment may have a
In this embodiment, the material and temperature of the inner hull IH in contact with the trunk deck space TS and the side passages SP can be selectively adjusted according to the value of the required BOR.
Specifically, in this embodiment, the inner hull IH can be controlled at a temperature of -55 to 30 占 폚. When the temperature of the inner hull IH is controlled at 0 캜, as shown in the table of Fig. 21, 0.1296 in which the BOR is reduced by 3.7% is obtained compared with the conventional example in which the inner hull IH is controlled at 35.3 캜 , And the inner hull (IH) can also use the steel grade A.
If the temperature of the inner hull IH is controlled to -25 캜, as shown in the table of Fig. 21, 0.1266 in which the BOR is reduced by 5.9% can be obtained and the inner hull IH can be used with the steel grade E or EH . Further, when the temperature of the inner hull IH is controlled to -30 캜 or lower, the inner hull IH can be manufactured as a low temperature steel LT.
In the present embodiment, the contents of the
FIG. 22 is a view schematically showing a state in which a thermal insulating material is provided in a ballast tank in a thermal insulation system for a floating marine structure according to a seventh embodiment of the present invention, and FIG. 23 is a graph showing the temperature of the inner hull IH contacting the ballast tank Table 1 shows the calculation results of the BOR generated by the control.
The
The present embodiment can lower the BOR by reducing the amount of heat penetration from the outside by lowering the temperature of the inner hull IH in contact with the LNG storage tank T in the ballast tank BT.
The BOR can be reduced by lowering the temperature of the inner hull (IH) in contact with the LNG storage tank (T) in the ballast tank (BT) by the heat insulating material (120) when traveling at a high temperature or in the summer.
When the temperature of the inner hull (IH) in contact with the LNG storage tank (T) is not controlled in the ballast tank (BT) as a result of numerical analysis of the actual LNG carrier by the numerical analysis, , The temperature of this part is 27.2 ~ 36.13 ℃, and the BOR is calculated as 0.1346.
However, when the temperature of the inner hull IH in contact with the LNG storage tank T in the ballast tank BT is controlled to 0 캜 by applying the present embodiment, as shown in the table of Fig. 23, the BOR is 0.1242 Which is about 7.7%. That is, since the BOR can be reduced by taking the cost of the low-
As another example, when the temperature of the inner hull (IH) in contact with the LNG storage tank (T) in the ballast tank (BT) is controlled to 5 ° C, the BOR is reduced to about 0.1262 by about 6.2%. It can also be seen that the use of the low-
The
In this embodiment, the
The present embodiment may have a
In this embodiment, the material and temperature of the inner hull (IH) in contact with the ballast tank (BT) can be selectively adjusted according to the required BOR value.
Specifically, in this embodiment, the inner hull IH in contact with the ballast tank BT can be controlled at a temperature of -55 to 30 占 폚. When the temperature of the inner hull IH is controlled to 0 캜, as shown in the table of Fig. 23, the BOR is reduced by 7.7% from the previous embodiment in which the inner hull IH is controlled at 27.1 to 36.1 캜, And the inner hull (IH) can also be made of steel grade A.
When the temperature of the inner hull IH is controlled to 5 캜, 0.1262 in which the BOR is reduced by 6.2% can be obtained as shown in the table of Fig. 23, and the inner hull IH can use the steel grade A .
In the present embodiment, the contents of the
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.
1,200,300,400: Floating structures
100,500,600: Insulation system of floating structure
10: copper dam 30: heating part
120: Insulation 220: Strength member
320:
Claims (13)
And a heating unit provided in the coffer dam to heat the coffer dam,
Wherein the cofferdams are controlled at a sub-zero temperature to reduce a boil-off rate (BOR) generated by heat transfer from the cofferdams to the inside of the plurality of LNG storage tanks, wherein the sub- And the temperature is changed to a specific temperature including the temperature.
Wherein the cofferd dam comprises:
A pair of bulkheads spaced apart from each other between the plurality of LNG storage tanks; And
And a space portion provided by the pair of bulkheads and the inner wall of the hull,
Wherein the temperature of the sub-tank is lowered to a specific temperature including a temperature of the image by heating the pair of bulkheads with the heating unit.
Wherein when the bulkhead of the copper dam is made of a material capable of withstanding from -30 to 0 占 폚, the copper dam is thermally deformed in a range of -30 to 70 占 폚.
Wherein when the bulkhead of the copper dam is made of low temperature steel capable of withstanding up to -55 占 폚, the copper dam is thermally changed in a range of -55 to 70 占 폚.
When the fuel consumption of the floating offshore structure is large, the temperature of the cofferdams is increased to increase the generation of boil-off gas (BOG)
Wherein when the fuel consumption of the offshore structure is small, the temperature of the cofferdams is lowered to reduce the occurrence of the BOG.
Wherein the coffer dam is heated by the heating unit so that an operator can enter the inside of the coffer dam, and the temperature of the coffer dam is controlled to a specific temperature including an image.
Wherein the freezing temperature of the cofferdam is changed to a specific temperature including the temperature of the image by the hot dry air supplied to the inside of the copper dam.
When the internal pressure of the LNG storage tank is higher than the set pressure of the LNG storage tank, the set temperature of the cofferdam is lowered,
Wherein the set temperature of the coffer dam is increased when the internal pressure of the LNG storage tank is less than the set pressure of the LNG storage tank.
Wherein the heating unit heats at least one of a trunk deck space controlled to a subzero temperature and a side passage way tangled with a trunk deck to control the trunk deck space and the side passage And the temperature of the floating structure is changed to a specific temperature including the temperature.
Wherein the floating structure is any one selected from the group consisting of LNG FPSO, LNG FSRU, LNG carrier, and LNG RV.
Controlling the coffer dam to a specific temperature including the temperature of the image so that the operator enters the cofferdam controlled by the subzero temperature; And
And controlling the cofferdams to a specific temperature of sub-zero when the operator exits the cofferdams.
Wherein the coffer dam is controlled in a temperature range of -55 to 70 占 폚.
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020130086268A KR20150011439A (en) | 2013-07-22 | 2013-07-22 | Floating marine structure and its temperature controlling method |
US14/907,246 US20160159450A1 (en) | 2013-07-22 | 2014-07-22 | Floating marine structure and method for controlling temperature thereof |
JP2016529706A JP2016531793A (en) | 2013-07-22 | 2014-07-22 | Floating marine structure and temperature control method for floating marine structure |
RU2016105233A RU2016105233A (en) | 2013-07-22 | 2014-07-22 | FLOATING STRUCTURE AND METHOD FOR REGULATING THE TEMPERATURE OF A FLOATING STRUCTURE |
PCT/KR2014/006667 WO2015012577A1 (en) | 2013-07-22 | 2014-07-22 | Floating marine structure and method for controlling temperature thereof |
CN201480051501.0A CN105555658A (en) | 2013-07-22 | 2014-07-22 | Floating marine structure and method for controlling temperature thereof |
Applications Claiming Priority (1)
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KR1020130086268A KR20150011439A (en) | 2013-07-22 | 2013-07-22 | Floating marine structure and its temperature controlling method |
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KR20150011439A true KR20150011439A (en) | 2015-02-02 |
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KR1020130086268A KR20150011439A (en) | 2013-07-22 | 2013-07-22 | Floating marine structure and its temperature controlling method |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20180018915A (en) * | 2016-08-10 | 2018-02-22 | (주)마이텍 | Glycol water heater for preventing brittle facture for lngc cargo |
FR3123305A1 (en) * | 2021-05-31 | 2022-12-02 | Gaztransport Et Technigaz | Vessel for the transport of a cold fluid |
-
2013
- 2013-07-22 KR KR1020130086268A patent/KR20150011439A/en not_active Application Discontinuation
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20180018915A (en) * | 2016-08-10 | 2018-02-22 | (주)마이텍 | Glycol water heater for preventing brittle facture for lngc cargo |
FR3123305A1 (en) * | 2021-05-31 | 2022-12-02 | Gaztransport Et Technigaz | Vessel for the transport of a cold fluid |
EP4098539A1 (en) * | 2021-05-31 | 2022-12-07 | Gaztransport Et Technigaz | Vessel for transporting or using a cold fluid |
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