KR102464895B1 - Liquefied Gas Storage Tank and Gas Treatment System and Vessel having the same - Google Patents

Abstract

The liquefied gas storage tank according to an embodiment of the present invention, in the liquefied gas storage tank forming an interface portion by the stored liquefied gas, is disposed on the interface portion to prevent sloshing of the liquefied gas Including, wherein the sloshing prevention device, the insulating portion floating on the interface portion of the liquefied gas; first and second metal parts formed on upper and lower sides of the heat insulating part; and a corrugation part formed under the second metal part to contact the interface part and preventing contraction or expansion of the second metal part.

Description

Liquefied gas storage tank and gas treatment system and vessel including the same

The present invention relates to a liquefied gas storage tank, a gas processing system including the same, and a ship.

The present invention is a small and medium-sized modular LNG storage tank development and commercialization (Development of modular LNG tank with small and medium capacity) project of the Ministry of Land, Infrastructure and Transport and Korea Agency for Infrastructure Technology Advancement It was derived from research conducted as part of

A ship is a means of transport that carries a large amount of minerals, crude oil, natural gas, or thousands of containers or more and sails the ocean. move through

Such a ship generates thrust by driving an engine, in which the engine uses gasoline or diesel to move the piston so that the crankshaft is rotated by the reciprocating motion of the piston, so that the shaft connected to the crankshaft is rotated to drive the propeller it was common

However, recently, as a fuel for ships, liquefied gas such as liquefied natural gas and liquefied petroleum gas has been used instead of gasoline or diesel to propel various ships such as LNG carriers and container carriers. is being used

When the liquefied gas is stored in the liquid phase, as heat permeates into the liquefied gas storage tank, some of the liquefied gas is vaporized to generate Boiled off Gas, which is Natural Boiled off Gas (NBOG). ) can cause problems in the liquefied gas treatment system, so in the past, the BOG was discharged to the outside and burned (in the past, BOG was simply discharged to the outside to reduce the risk of damage to the tank by lowering the tank pressure). was used to solve the problem.

However, this causes environmental pollution and resource waste. Therefore, in order to fundamentally solve this problem, a lot of research and development has been conducted on a technology for reducing the Boil-Off Rate (BOR), which is the rate at which liquefied gas naturally generates boil-off gas in the liquefied gas storage tank. It is in progress.

The present invention was created to improve the prior art, and an object of the present invention is to reduce the BOG generation rate in the liquefied gas storage tank, to easily detect damage to the liquefied gas storage tank, and to make repairs easier, An object of the present invention is to provide a liquefied gas storage tank capable of efficiently processing liquefied gas or boil-off gas in the gas storage tank, a gas processing system including the same, and a ship.

The liquefied gas storage tank according to the present invention comprises a sloshing prevention device disposed on the interface portion to prevent sloshing of the liquefied gas, The sloshing prevention device may include: an insulating part floating on the interface part of the liquefied gas; first and second metal parts formed on upper and lower sides of the heat insulating part; and a corrugation part formed under the second metal part to contact the interface part and preventing contraction or expansion of the second metal part.

Specifically, the heat insulating part may be made of polyurethane foam (PUF) and plywood, and the first and second metals may be made of stainless steel.

Specifically, it further comprises a shock absorber for alleviating the impact of the sloshing prevention device, the shock absorber may be formed on the inner wall of the liquefied gas storage tank facing the sloshing prevention device.

Specifically, the sloshing prevention device may be fixed by a pump tower.

Specifically, a pump including the liquefied gas storage tank and disposed in the pump tower for supplying the liquefied gas to a consumer; And it may be a gas treatment system, characterized in that it further comprises a vaporizer for receiving the liquefied gas supplied from the pump to vaporize the supply to the demand.

Specifically, it may be a ship, characterized in that it includes the liquefied gas storage tank.

A liquefied gas storage tank according to the present invention, a gas processing system and a ship including the same, build a fixed pump and a vertical movement pump in the liquefied gas storage tank, and select the liquefied gas near the interface of the liquefied gas through the vertical movement pump Because it can be consumed, liquefied gas in the thermal stratification section can be consumed preferentially, which has the effect of reducing the generation rate of BOG in the liquefied gas storage tank and minimizing the construction cost.

In addition, the liquefied gas storage tank according to the present invention, and a gas processing system and a ship including the same, install a suction device capable of sucking boil-off gas in the liquefied gas storage tank in the lower part of the liquefied gas storage tank, and evaporate at a relatively high temperature. Since the gas can be supplied to a distant vicinity from the interface of the liquefied gas, the thermal load of the liquefied gas storage tank is reduced, thereby reducing the generation rate of boil-off gas in the liquefied gas storage tank, and the simple system has the effect of minimizing the construction cost. .

In addition, the liquefied gas storage tank according to the present invention, and a gas processing system and ship including the same, build a floating type sloshing prevention device at the interface of the liquefied gas stored in the liquefied gas storage tank, It is possible to prevent the phenomenon of seeping, thereby reducing the generation rate of boil-off gas in the liquefied gas storage tank, and has the effect of minimizing the construction cost because the system is simple.

In addition, the liquefied gas storage tank according to the present invention, and a gas treatment system and a ship including the same, can easily detect whether the insulation is damaged by constructing a fine tube-shaped tube containing a pigment on the outer surface of the insulation of the liquefied gas storage tank. There is an effect that the maintenance can be facilitated accordingly.

In addition, the liquefied gas storage tank according to the present invention, and a gas processing system and a ship including the same, can process the boil-off gas in the liquefied gas storage tank through a suction device and supply it to the boiler regardless of the internal pressure of the liquefied gas storage tank, There is an effect that the stability of the liquefied gas storage tank is increased and the construction cost for the treatment of boil-off gas is reduced.

1 is a conceptual diagram of a ship having a liquefied gas storage tank and a gas processing system according to an embodiment of the present invention.
2 is a conceptual diagram of a gas processing system according to an embodiment of the present invention.
3 is a conceptual diagram of a gas processing system according to another embodiment of the present invention.
4 is a conceptual diagram of a liquefied gas storage tank according to an embodiment of the present invention, (a) is a cross-sectional view of the liquefied gas storage tank, (b) is a conceptual diagram of a sloshing prevention device.
5 is a conceptual view of a liquefied gas storage tank according to another embodiment of the present invention, (a) is a perspective view of the liquefied gas storage tank, (b) is a cross-sectional view AA of the liquefied gas storage tank.
FIG. 6 is an enlarged view of part B of FIG. 5 .
7 is a conceptual diagram of a gas processing system according to another embodiment of the present invention.

The objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments taken in conjunction with the accompanying drawings. In the present specification, in adding reference numbers to the components of each drawing, it should be noted that only the same components are given the same number as possible even though they are indicated on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, the liquefied gas may be LPG, LNG, ethane, etc., for example, may refer to LNG (Liquefied Natural Gas), and the boil-off gas may refer to BOG (Boil Off Gas) which is naturally vaporized LNG or the like.

Liquefied gas may be referred to as a liquid state, a gas state, a liquid and gas mixture state, a supercooled state, a supercritical state, etc. regardless of a change in state, and it should be noted that boil-off gas is also the same. In addition, it is obvious that the subject of the present invention is not limited to liquefied gas, and may be a liquefied gas processing system and/or a boil-off gas processing system, and the systems in the drawings to be implemented below may be applied to each other. In addition, the mixed fluid to be described below may be a fluid including mixed boil-off gas or at least some liquid phase.

In this case, the vessel 1 may be a vessel using LNG as a fuel, a vessel such as FLNG, FSRU, or an LNG carrier, but is not limited thereto.

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

1 is a conceptual diagram of a ship having a liquefied gas storage tank and a gas processing system according to an embodiment of the present invention, and FIG. 2 is a conceptual diagram of a gas processing system according to an embodiment of the present invention.

As shown in FIGS. 1 and 2 , the gas processing system 2 according to the embodiment of the present invention includes a liquefied gas storage tank 10 , first and second pumps 21 and 22 , and a guide structure 23 . , the carburetor 30, the customer 40 and the control unit 50, including the gas treatment system (2) is installed, the vessel (1), the upper deck (D), the upper deck (D) is built on the upper side and formed on the stern side The stack (Ch) and the cabin (C) being formed on the stern side and the engine room (ER) provided with the propulsion engine 41, and the upper deck (D) formed with the liquefied gas storage tank 10 formed on the central side lower side It has a hull 1a constituted by the inside of a ship (not shown) and the like.

Hereinafter, a vessel 1 including a gas processing system 2 according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2 .

Before describing the individual components of the gas processing system 2 according to the embodiment of the present invention, basic flow paths that organically connect the individual components will be described. Here, the flow path is a passage through which the fluid flows and may be a line.

In the embodiment of the present invention, it may further include a liquefied gas supply line (L1), a movable liquefied gas supply line (L1a) and a fixed type liquefied gas supply line (L1b). Valves (not shown) capable of adjusting the opening degree may be installed in each line, and the supply amount of boil-off gas or liquefied gas may be controlled according to the control of the opening degree of each valve.

The liquefied gas supply line L1 connects the pumps 21 and 22 disposed in the liquefied gas storage tank 10 and the demand 40 , and may include a vaporizer 30 .

The liquefied gas supply line (L1) may be formed by joining the movable liquefied gas supply line (L1a) and the fixed liquefied gas supply line (L1b) to each other, and the liquefied gas stored in the liquefied gas storage tank 10 is supplied to the customer 40 ) can be supplied.

The movable liquefied gas supply line (L1a) is connected to the second pump (22), merges with the fixed liquefied gas supply line (L1b), and the liquefied gas stored in the liquefied gas storage tank (10) can be supplied to the customer (40). have. At this time, the movable liquefied gas supply line (L1a), only the end connected to the second pump (22) can move together with the second pump (22).

The fixed liquefied gas supply line (L1b) is connected to the first pump (21) to join the movable liquefied gas supply line (L1a), and the liquefied gas stored in the liquefied gas storage tank (10) can be supplied to the consumer (40). have.

Hereinafter, individual components that are organically formed by the above-described lines L1a, L1b, and L1 to implement the gas processing system 2 will be described.

The liquefied gas storage tank 10 stores the liquefied gas to be supplied to the consumer 40 . The liquefied gas storage tank 10 should store the liquefied gas in a liquid state. At this time, the liquefied gas storage tank 10 may have a pressure tank shape.

Here, the liquefied gas storage tank 10 is disposed inside the hull 1a, and may be formed in four, for example. In addition, the liquefied gas storage tank 10 is, for example, a membrane type tank, but is not limited thereto, and the type is not particularly limited to various types, such as an independent tank.

In the liquefied gas storage tank 10, the liquefied gas forming the interface part (I) is stored, boil-off gas (BOG) is generated on the upper side of the interface part (I), and liquefied gas ( LNG) is stored.

In the present invention, the liquefied gas storage tank 10 may be in the form of an independent tank. Hereinafter, the case of the independent tank type will be described.

The liquefied gas storage tank 10 includes an outer tank (not shown), an inner tank (not shown), and a heat insulator (not shown). The outer tank is a structure constituting the outer wall of the liquefied gas storage tank 10, and may be formed of steel, and may have a polygonal cross-section.

The inner tank is provided inside the outer tank, and may be supported and installed inside the outer tank by a support (not shown). In this case, the support may be provided at the lower end of the inner tank, of course, may also be provided on the side of the inner tank to suppress the left and right flow of the inner tank.

The inner tank may be formed of a stainless material, and may be designed to withstand a pressure of 1 bar to 10 bar (eg, 6 bar). The reason why the inner tank is designed to withstand the constant pressure as described above is because the inner pressure of the inner tank may increase as the liquefied gas provided in the inner tank is evaporated to generate boil-off gas.

A baffle (not shown) may be provided inside the inner tank. The baffle refers to a plate in the form of a grid, and as the baffle is installed, the pressure inside the inner tank is evenly distributed to prevent the inner tank from receiving concentrated pressure in a portion.

The insulator may be provided between the inner tank and the outer tank and may block external thermal energy from being transmitted to the inner tank. In this case, the heat insulating part may be in a vacuum state. As the insulation is formed in a vacuum, the liquefied gas storage tank 10 can withstand high pressure more efficiently, compared to a general tank. For example, the liquefied gas storage tank 10 may withstand a pressure of 5 bar to 20 bar through a vacuum insulating part.

As described above, in the present invention, by using the pressure tank type liquefied gas storage tank 10 having a vacuum type heat insulating part between the outer tank and the inner tank, the generation of boil-off gas can be minimized, and the liquefied gas is stored even when the internal pressure rises. It is possible to prevent problems such as damage to the tank 10 in advance.

In addition, the liquefied gas storage tank 10 may include a pump tower 11 .

The pump tower 11 extends through a dome (not shown) formed in the liquefied gas storage tank 10 to the bottom surface (not shown) of the liquefied gas storage tank 10, and the first pump 21 and the second pump 22 may be installed.

The first pump 21 is fixedly arranged in the liquefied gas storage tank 10 to supply the liquefied gas to the demand 40 .

Specifically, the first pump 21 is built in a state fixed to the lower side of the pump tower 11, and sucks only the liquefied gas stored in the lower part of the liquefied gas storage tank 10 and can be supplied to the consumer 40. .

The second pump 22 is arranged to be movable in the liquefied gas storage tank 10, supplies the liquefied gas to the consumer 40, and moves along with the change in the position of the interface part (I) to supply the liquefied gas. It is supplied to the consumer (40).

Specifically, the second pump 22 is movably connected to the guide structure 23 disposed in the pump tower 11 , and can move vertically or horizontally along the guide structure 23 .

The guide structure 23 is formed in the pump tower 11 and may guide the movement of the second pump 22 .

Although the guide structure 23 is illustrated as being formed only in the vertical direction in FIG. 2 , it is not limited thereto and may also be formed in a horizontal direction.

The vaporizer 30 may receive liquefied gas from at least one of the first pump 21 and the second pump 22 , vaporize it, and supply it to the consumer 40 .

Specifically, the vaporizer 30 is disposed between the demand 40 and the first and second pumps 21 and 22 on the liquefied gas supply line L1, from the first and second pumps 21 and 22 The supplied liquefied gas may be vaporized to a temperature required by the customer 40, and in this case, the pressure of the liquefied gas may not be changed.

The consumer 40 receives and consumes the liquefied gas stored in the liquefied gas storage tank 10 through the liquefied gas supply line L1 , and may be, for example, the propulsion engine 41 .

In the present invention, the type is not limited, and any device capable of consuming liquefied gas is possible.

The controller 50 may control the movement of the second pump 22 according to the upper and lower temperature distribution of the liquefied gas stored in the liquefied gas storage tank 10 .

Here, the control unit 50 may further include a sensor unit 51 for measuring a vertical temperature distribution of the liquefied gas stored in the liquefied gas storage tank 10 . In this case, the sensor unit 51 may be connected to the control unit 50 by wire or wirelessly to transmit information on the vertical temperature distribution of the liquefied gas to the control unit 50 .

Specifically, the control unit 50 receives the temperature distribution information of the liquefied gas from the sensor unit 51 and receives the second pump 22 at a position where the highest temperature among the upper and lower temperature distributions measured by the sensor unit 51 is formed. It is possible to control the position of the second pump 22 to move the.

Normally, the liquefied gas stored in the liquefied gas storage tank 10 has a higher temperature at the upper part than the lower part, so that boil-off gas is generated. As such, since the temperature near the interface part (I) of the liquefied gas is quite high, in the present invention, the liquefied gas near the interface part (I) can be used before the liquefied gas at the bottom, and the liquefied gas in the thermal stratification section is consumed. As a result, the thermal load of the liquefied gas storage tank is reduced, thereby reducing the amount of boil-off gas generated.

In addition, when the upper and lower temperature distribution measured by the sensor unit 51 differs by more than a preset temperature, the control unit 50 may operate the second pump 22 in preference to the first pump 21 . . In this case, the control unit 50 may be connected to the first pump 21 and the second pump 22 by wire or wirelessly.

Here, the control unit 50 may operate the second pump 22 in preference to the first pump 21 after moving the position of the second pump 22, and the upper and lower temperature distribution is less than the preset temperature In this case, the first pump 21 and the second pump 22 may be operated at the same time.

As such, in the present invention, the driving position of the second pump 22, that is, the position at which the second pump 22 sucks the liquefied gas is located in the liquefied gas thermal stratification section, and the liquefied gas of the liquefied gas thermal stratification section is consumed in advance. This has the effect of reducing the thermal load in the liquefied gas storage tank and thus reducing the BOG generation rate.

In addition, when the first pump 21 malfunctions or stops, the control unit 50 may stop the first pump 21 and operate the second pump 22 instead.

Through this, in the present invention, even when the first pump 21 malfunctions, the second pump 21 can be driven, so that the reliability of the liquefied gas supply can be constantly maintained.

As described above, the gas treatment system 2 and the ship 1 including the same according to the present invention build a fixed type pump 21 and a vertical movement type pump 22 in the liquefied gas storage tank 10, and the interface of the liquefied gas The liquefied gas in the vicinity of the part (I) can be consumed in advance through the vertical movement pump 22, so that the liquefied gas in the thermal stratification section can be consumed preferentially, and thus the generation rate of boil-off gas in the liquefied gas storage tank 10 It has the effect of reducing the cost of construction and minimizing the construction cost.

3 is a conceptual diagram of a liquefied gas storage tank according to an embodiment of the present invention.

As shown in FIG. 3 , the gas treatment system 2 according to the embodiment of the present invention includes a liquefied gas storage tank 10 , a pump 20 , a suction device 60 , a driving fluid supply line 61 , and suction It includes a fluid supply line 62 , a boil-off gas suction line 63 , and a mixed fluid discharge line 64 .

Here, the configuration other than the suction device 60 , the driving fluid supply line 61 , the suction fluid supply line 62 , the boil-off gas suction line 63 and the mixed fluid discharge line 64 is the gas treatment system 2 described in FIG. 2 . ) and the same reference numerals for convenience, but do not necessarily refer to the same configuration.

Hereinafter, the vessel 1 including the gas processing system 2 according to the embodiment of the present invention will be described with reference to FIG. 3 , and the configuration of the liquefied gas storage tank 10 is the liquefied gas described in FIG. 2 . Since it is the same as the storage tank 10, it should be replaced.

The pump 20 is disposed at a position where the liquefied gas is stored under the interface portion I, and supplies the liquefied gas to the suction device 60 .

The pump 20 may be disposed closer to the interface portion I by the pump tower 11 (shown in FIG. 2) than the lower surface (not shown) of the liquefied gas storage tank 10, It can be formed into a submersible type.

The suction device 60 receives the liquefied gas from the pump 20 and sucks the boil-off gas formed in the upper portion of the interface portion I, and mixes the supplied liquefied gas with the sucked boil-off gas to the liquefied gas storage tank 10 . discharged to the lower part of Here, the suction device 60 may preferably be an ejector.

The suction device 60 is disposed below the liquefied gas storage tank 10 , and includes a driving fluid supply line 61 , a suction fluid supply line 62 , a boil-off gas suction line 63 , and a mixed fluid discharge line 64 . ) may be included.

The driving fluid supply line 61 connects the pump 20 and the suction device 60 , and may receive the liquefied gas supplied from the pump 20 .

The suction fluid supply line 62 connects the BOG suction line 63 and the suction device 60 , and may supply BOG sucked by the BOG suction line 63 to the suction device 60 .

The boil-off gas suction line 63 is disposed on the upper side of the interface portion I to suck the boil-off gas, for example, horizontally on the upper side of the interface portion I by a pump tower 11 (shown in FIG. 2 ). installed and connected to the suction fluid supply line 62 to deliver the sucked boil-off gas to the suction fluid supply line 62 .

The mixed fluid discharge line 64 may discharge the liquefied gas and the boil-off gas mixed in the suction device 60 to the lower portion of the liquefied gas storage tank 10 . In this case, the mixed fluid discharge line 64 may have an end disposed below the liquefied gas storage tank 10 .

As described above, the gas treatment system 2 according to the present invention and the ship 1 including the same include the suction device 60 capable of sucking the boil-off gas in the liquefied gas storage tank 10 in the liquefied gas storage tank 10 . BOG in the liquefied gas storage tank 10 is reduced by reducing the thermal load of the liquefied gas storage tank 10 because it is installed under the It has the effect of reducing the incidence rate and minimizing the construction cost because the system is simple.

4 is a conceptual diagram of a liquefied gas storage tank according to an embodiment of the present invention, (a) is a cross-sectional view of the liquefied gas storage tank, (b) is a conceptual diagram of a sloshing prevention device.

As shown in FIG. 4 , the liquefied gas storage tank 10 according to the embodiment of the present invention includes a pump tower 11 , a sloshing prevention device 12 and a buffer device 13 .

Here, the components other than the sloshing prevention device 12 and the shock absorber 13 may use the same reference numerals for convenience as each configuration in the gas processing system 2 described in FIGS. 2 and 3, but do not necessarily refer to the same configuration. not.

Hereinafter, the gas processing system 2 and the ship 1 including the liquefied gas storage tank 10 according to an embodiment of the present invention will be described with reference to FIG. 4 , and the configuration of the pump tower 11 is Since it is the same as the pump tower 11 described in FIG. 2, it is replaced with this.

The sloshing prevention device 12 is disposed on the interface portion I to prevent sloshing of the liquefied gas, and may be disposed to float on the interface portion I or fixed by the pump tower 11 .

The sloshing prevention device 12 includes a heat insulating part 122 , first and second metal parts 121 and 123 , and a corrugation part 124 .

The heat insulating part 122 may be formed of polyurethane foam (PUF-45) and plywood with low thermal conductivity to block the external heat source supplied to the interface part (I), and the interface part of liquefied gas ( I) may have a density of 45 kg/m3 which is smaller than the density of liquefied gas (450 kg/m3) to float on the phase.

Through this, the heat insulating part 122 can effectively block the heat flowing from the upper side of the interface part I, thereby effectively preventing the generation of boil-off gas.

The first metal part 121 is formed on the upper side of the heat insulating part 122 and is made of a stainless steel (SUS304L) material to strengthen the rigidity of the heat insulating part 122 . Through this, it is possible to prevent the destruction of the heat insulating part 122 due to the sloshing of the liquefied gas.

The second metal part 123 is formed below the heat insulating part 122 and is made of a stainless steel (SUS304L) material to strengthen the rigidity of the heat insulating part 122 . Through this, it is possible to prevent the destruction of the heat insulating part 122 due to the sloshing of the liquefied gas.

The corrugation part 124 is formed under the second metal part 123 to be in contact with the interface part I, and is formed in the form of wrinkles to prevent contraction or expansion of the second metal part 123 . can be

The shock absorber 13 can mitigate the impact from the sloshing prevention device 12 on the inner wall of the liquefied gas storage tank 10, and for this purpose, the liquefied gas storage tank facing the sloshing prevention device 12 It may be formed on the inner wall of (10).

The shock absorber 13 may be configured as, for example, a damper in order to mitigate the impact.

Through this, it is possible to prevent a decrease in stability due to the impact of the liquefied gas storage tank 10 .

As described above, the liquefied gas storage tank 10 according to the present invention and the gas treatment system 1 and the vessel 1 including the same are floating on the interface portion I of the liquefied gas stored in the liquefied gas storage tank 10 . By constructing the sloshing prevention device 12 in the form of a sloshing phenomenon at the liquefied gas interface, it is possible to reduce the generation rate of boil-off gas in the liquefied gas storage tank 10 and to minimize the construction cost due to the simple system. can have an effect.

In addition, the liquefied gas storage tank 10 and the gas treatment system 1 and the ship 1 including the same according to the present invention improve the stability of the liquefied gas storage tank 10 through the shock absorber 13, By preventing the occurrence of sloshing through the sloshing prevention device 12, there is an effect that can also improve the stability of the liquefied gas storage tank (10).

5 is a conceptual view of a liquefied gas storage tank according to another embodiment of the present invention, (a) is a perspective view of the liquefied gas storage tank, (b) is a cross-sectional view A-A of the liquefied gas storage tank, FIG. It is an enlarged view of part B.

As shown in FIGS. 5 and 6 , the liquefied gas storage tank 10 according to an embodiment of the present invention includes a heat insulating part 101, a first pipe fiber part 101a and a second pipe fiber part 101b. do.

Here, the configuration other than the heat insulating part 101, the first pipe fiber part 101a, and the second pipe fiber part 101b are the same reference numerals as the respective configurations in the gas treatment system 2 described with reference to FIGS. 2 to 4 for convenience. may be used, but do not necessarily refer to the same configuration.

Hereinafter, the gas processing system 2 and the ship 1 including the liquefied gas storage tank 10 according to an embodiment of the present invention will be described with reference to FIG. 4 .

The liquefied gas storage tank 10 has an outer surface with a double wall formed by an inner wall 10a and an outer wall 10b, and stores liquefied gas inside the inner wall 10a, and between the inner wall 10a and the outer wall 10b The heat insulating part 101 may be formed.

The heat insulating part 101 is formed of a heat insulating material such as polyurethane foam (PUF) between the outer wall 10a and the inner wall 10b and blocks an external heat source flowing into the liquefied gas storage tank 10 . The tubular fiber parts 101a and 101b containing at least one dye may be formed inside the heat insulating part 101 so that a damage location can be grasped when the heat insulating part 101 is damaged.

The heat insulating part 101 may be formed by spraying on the outside of the inner wall 10a, and the tubular fiber parts 101a and 101b may be formed by being impregnated in the heat insulating part 101 .

The tubular fiber parts 101a and 101b have at least the breaking strength range of the insulating part 101 so that the breaking strength is destroyed together with the insulating part 101 to determine the damage location when the insulating part 101 is damaged. It can be designed to include some.

The first tubular fiber part 101a is formed in a tubular shape inside the heat insulating part 101, a first dye can be accommodated therein, and the second tubular fiber part 101b has the heat insulating part 101 . It is formed in the form of a tube in the inside, and the second dye can be accommodated therein.

Here, since the first and second dyes may have different colors, the damaged location can be easily and quickly found by designating the color for each location.

Through this, in the present invention, when the heat insulating part 101 is broken and the first and second tube fiber parts 101a and 101b are damaged, the first and second dyes are leaked to the outside to damage the heat insulating part 101 . There is an effect that can be easily identified by color.

The first tubular fiber part 101a and the second tubular fiber part 101b may be formed in close contact with each other in order to allow the two dyes to react with each other when the heat insulating part 101 is damaged or damaged.

Here, the first and second dyes may react with each other to be foamed, and for example, polyurethane foam (PUF) may be formed.

Through this, in the present invention, when the heat insulating part 101 is broken and the first and second tube fiber parts 101a and 101b are damaged, the first and second dyes leak to the outside and react with each other, and the reaction of the two dyes As a result, the safety of the liquefied gas storage tank 10 can be maximized by self-repairing the damaged position of the thermal insulation unit 101 .

The first and second dyes may have the same color as each other.

As described above, the liquefied gas storage tank 10 and the gas treatment system 2 and the ship 1 including the same according to the present invention are in the form of a fine tube in which a pigment is added to the heat insulating part 101 of the liquefied gas storage tank 10 . By constructing the tubular fiber parts 101a and 101b of

7 is a conceptual diagram of a gas processing system according to another embodiment of the present invention.

As shown in FIG. 7 , the gas treatment system 2 according to the embodiment of the present invention includes a liquefied gas storage tank 10 , a pump 20 , a vaporizer 30 , a consumer 40 , a suction device 70 and It includes first to fourth valves (81 to 84).

Here, the configuration of the liquefied gas storage tank 10, the pump 20, and the vaporizer 30 may use the same reference numerals for convenience as each configuration in the gas processing system 2 described in FIGS. 2 to 6, but must be the same. does not refer to In addition, in the embodiment of the present invention, the liquefied gas storage tank 10 may be a C-type storage tank.

Hereinafter, a vessel 1 including a gas processing system 2 according to an embodiment of the present invention will be described with reference to FIG. 7 .

Before describing the individual components of the gas processing system 2 according to the embodiment of the present invention, basic flow paths that organically connect the individual components will be described. Here, the flow path is a passage through which the fluid flows and may be a line.

In the embodiment of the present invention, the liquefied gas supply line (L1), the boil-off gas supply line (L2), the first branch line (L3), the power generation engine fuel supply line (L3a), the second branch line (L4) and the bypass A line BL may be further included. Valves (not shown) capable of adjusting the opening degree may be installed in each line, and the supply amount of boil-off gas or liquefied gas may be controlled according to the control of the opening degree of each valve.

The liquefied gas supply line L1 connects the liquefied gas storage tank 10 and the propulsion engine 41 , and may include a pump 20 and a vaporizer 30 , and is stored in the liquefied gas storage tank 10 . Liquefied gas may be supplied to the propulsion engine 41 .

The boil-off gas supply line (L2) connects the liquefied gas storage tank (10) and the boiler (43), and may include a suction device (70) and a first valve (81), and a liquefied gas storage tank (10) It is possible to supply the boil-off gas generated in the boiler (43). Here, the first valve 81 may be a check valve.

The first branch line (L3) is branched from the downstream of the vaporizer (30) on the liquefied gas supply line (L1) and is connected to the suction device (70), and may include a second valve (82), the vaporizer (30) At least a portion of the vaporized liquefied gas may be supplied to the suction device (70). Here, the second valve 82 may control the supply amount of boil-off gas or liquefied gas according to the adjustment of the opening degree of the valve.

The power generation engine fuel supply line (L3a) is branched on the first branch line (L3), is connected to the power generation engine (42), may include a third valve (83), and liquefied gas vaporized in the vaporizer (30) At least a portion of may be supplied to the power generation engine (42). Here, the third valve 83 may control the supply amount of boil-off gas or liquefied gas according to the adjustment of the opening degree of the valve.

The second branch line (L4) is branched from the downstream of the carburetor 30 on the liquefied gas supply line (L1) and is connected to the boiler 43, and may have a fourth valve 84, and in the carburetor 30 At least a portion of the vaporized liquefied gas may be supplied to the boiler 43 . Here, the fourth valve 84 may control the supply amount of boil-off gas or liquefied gas according to the adjustment of the opening degree of the valve.

The bypass line BL connects the rear end and the front end of the suction device 70 on the boil-off gas supply line L2, and may include a bypass valve 71, and may be boiled in the suction device 70 ( 43) and the remaining mixed fluid may be bypassed from the rear end of the suction device 70 to the front end. Here, the bypass valve 71 may control the supply amount of boil-off gas or liquefied gas according to the control of the opening degree of the valve.

Hereinafter, individual components that are organically formed by the above-described lines L1a, L1b, and L1 to implement the gas processing system 2 will be described.

The consumer 40 may receive and consume the liquefied gas stored in the liquefied gas storage tank 10 or the boil-off gas generated in the liquid gas storage tank 10, and use the supplied liquefied gas or boil-off gas as a raw material. is driven

That is, the consumer 40 requires liquefied gas and may include all devices and mechanisms driven by using the liquefied gas as a raw material. However, in the embodiment of the present invention, the demand 40 may be a propulsion engine 41 , a power generation engine 42 and a boiler 43 .

The propulsion engine 41 generates a thrust in the ship 1, for example, 10 to 20 bar (bar), preferably, can consume boil-off gas or liquefied gas having a pressure of 17 bar (bar). Here, the propulsion engine 41 is a low-pressure gas injection engine and may be a low-speed two-stroke low-pressure gas injection engine (XDF).

In the low-speed two-stroke low-pressure gas injection engine 41, as a piston (not shown) inside a cylinder (not shown) reciprocates by combustion of liquefied gas, boil-off gas, or oil, the crankshaft ( (not shown) may be rotated, and a shaft (not shown) connected to the crankshaft may be rotated. Accordingly, as the propeller (not shown) connected to the shaft rotates when the low-speed two-stroke low-pressure gas injection engine 41 is driven, the ship 1 may move forward or backward.

The low-speed two-stroke low-pressure gas injection engine 41 in the embodiment of the present invention may be a 2s DF engine (XDF engine) developed by Wartsila, and may be driven according to an Otto cycle. have.

That is, the low-speed two-stroke low-pressure gas injection engine 41 first compresses the air-fuel mixture supplied to the cylinder to top dead center, and at the moment when ignition is made by pilot fuel from the outside at compression top dead center, the air - Let all the fuel mixtures burn completely to generate explosive power. At this time, the air-fuel mixture mass ratio may be in a lean state less than 14.7:1, and thus may be in the form of a lean burn engine.

At this time, HFO (Heavy Fuel Oil) or MDO (Marine Diesel Oil) is used as the ignition fuel, and the ratio of ignition fuel to high-pressure gas is usually about 1:99, so ignition is possible with a very small amount.

The low-speed two-stroke low-pressure gas injection engine 41 can generate power by receiving a supply of liquefied gas of 8 bar to 20 bar (preferably 17 bar), and the state of the supplied liquefied gas is a low-speed two-stroke low-pressure gas injection engine 41 . This may vary depending on the required condition.

In general, large ships generate thrust through a MEGI engine (not shown), but in the embodiment of the present invention, a low-speed two-stroke low-pressure gas injection engine 41 is used as an engine for generating thrust of the ship 1, resulting in many advantage is created

MEGI engine requires a high pressure of about 200 bar to 300 bar of supply fuel pressure required for driving, so that power consumption for driving is about 210KW to 220KW (about 215KW).

On the other hand, the low-speed two-stroke low-pressure gas injection engine 41 has a low pressure of 8 bar to 20 bar (preferably 17 bar) of supply fuel required for driving, and consumes about 13 KW to 17 KW (about 15 KW) of power to drive. ), it has the effect of reducing a lot of power compared to the MEGI engine.

In addition, the MEGI engine has a problem in that the driving pressure is quite high, so a gas supply system (not shown) accompanying it to generate the pressure required by the MEGI engine is very complicated and occupies a lot of space.

The low-speed two-stroke low-pressure gas injection engine 41 has an advantage in that the driving pressure is low to a low pressure, so that the fuel supply system is very simple and takes up little space.

The power generation engine 42 generates the electric power consumed by the ship 1, for example, 10 to 20 bar (bar), preferably can consume boil-off gas or liquefied gas having a pressure of 17 bar (bar). have.

The power generation engine 42 may be a heterogeneous fuel engine (DFDE) 22 .

The hetero fuel engine (DFDE) 42 may be an engine for generating power generation or other power. In the heterogeneous fuel engine 42, liquefied gas and fuel oil are not mixed and supplied, but liquefied gas or fuel oil (oil) may be selectively supplied. This is to prevent the two materials having different combustion temperatures from being mixed and supplied, thereby preventing the engine efficiency from being lowered.

The boiler 43 may be supplied with boil-off gas or liquefied gas having a pressure lower than the consumption pressure of the propulsion engine 41 and consumed, and consume fuel at a pressure lower than the consumption pressure of the power generation engine 42 . can

The suction device 70 receives the liquefied gas from the liquefied gas supply line L1 and sucks the boil-off gas generated in the liquefied gas storage tank 10 through the boil-off gas supply line L2 and liquefies it into the boiler 43 . A mixed fluid mixed with gas and BOG is supplied, and the suction device 70 transfers BOG generated in the liquefied gas storage tank 10 to the boiler 43 regardless of the internal pressure of the liquefied gas storage tank 10 . supply Here, the suction device 70 may receive the vaporized liquefied gas by the first branch line L3 branched from the downstream of the vaporizer 30 on the liquefied gas supply line L1.

As described above, in the present invention, since the suction device 70 supplies the mixed fluid only to the boiler 43 instead of the power generation engine 42 , there is an advantage that BOG can be efficiently processed without a separate compressor.

When the flow rate of the mixed fluid supplied to the boiler 43 is greater than the flow rate consumed by the boiler 43 , the suction device 70 passes the mixed fluid through the bypass line BL to the rear end of the suction device 70 . can be bypassed by shear.

Here, the boil-off gas supply line L2 may be provided at a higher upstream than a portion to which the bypass line BL is connected among the front ends of the suction device 70 for the first valve 81 .

The first valve 81 prevents the mixed fluid bypassed from the rear end to the front end of the suction device 70 by the bypass line BL and the suction device 70 from flowing back into the liquefied gas storage tank 10 . and preferably a check valve.

In an embodiment of the present invention, the pump 20 may pressurize the liquefied gas to a pressure of 10 to 20 bar, and the suction device 70 may preferably be an ejector.

As described above, the gas treatment system 2 and the ship 1 including the same according to the present invention evaporate in the liquefied gas storage tank 10 regardless of the internal pressure of the liquefied gas storage tank 10 through the suction device 70 . Since the gas can be processed and supplied to the boiler 43, the stability of the liquefied gas storage tank 10 is increased and the construction cost for the treatment of boil-off gas is reduced.

Although the present invention has been described in detail through specific examples, it is intended to describe the present invention in detail, and the present invention is not limited thereto. It will be clear that the transformation or improvement is possible.

All simple modifications or changes of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be made clear by the appended claims.

1: Ship 1a: Hull
2: gas treatment system 10: liquefied gas storage tank
10a: inner wall 10b: outer wall
101: heat insulating part 101a: first tube fiber part
101b: second tube fiber part 11: pump tower
12: sloshing prevention device 121: first metal part
122: heat insulating part 123: second metal part
124: corrugation unit 13: shock absorber
21: first pump 22: second pump
23: guide structure 30: carburetor
40: demand 41: propulsion engine
42: power generation engine 43: boiler
50: control unit 51: sensor unit
60: suction device 61: driving fluid supply line
62: suction fluid supply line 63: boil off gas suction line
64: mixed fluid discharge line 70: suction device
71: bypass valve 81: first valve
82: second valve 83: third valve
84: fourth valve L1: liquefied gas supply line
L1a: Mobile liquefied gas supply line L1b: Fixed liquefied gas supply line
L2: BOG supply line L3: First branch line
L3a: power generation engine fuel supply line L4: second branch line
BL: bypass line
C: Cabin Ch: Stack
D: Upper deck ER: Engine room
I: interface

Claims (6)

In the liquefied gas storage tank forming an interface part by the stored liquefied gas,
and a sloshing prevention device disposed on the interface portion to prevent sloshing of the liquefied gas,
The sloshing prevention device,
a heat insulating part floating on the interface part of the liquefied gas;
a first metal part formed on an upper side of the heat insulating part;
a second metal part formed below the heat insulating part; and
It is formed under the second metal part and comes in contact with the interface part, and includes a corrugation part for preventing contraction or expansion of the second metal part,
Further comprising a shock absorber for alleviating the impact of the sloshing prevention device,
The shock absorber is
Liquefied gas storage tank, characterized in that formed on the inner wall of the liquefied gas storage tank facing the sloshing prevention device. The method of claim 1,
The insulating part is composed of polyurethane foam (PUF) and plywood,
The first and second metal is a liquefied gas storage tank, characterized in that consisting of stainless steel. delete The method of claim 1,
The sloshing prevention device is a liquefied gas storage tank, characterized in that fixed by a pump tower. 5. The method of claim 4,
Including the liquefied gas storage tank,
a pump disposed in the pump tower and supplying the liquefied gas to a consumer; and
Gas processing system, characterized in that it further comprises a vaporizer for receiving the liquefied gas from the pump to vaporize the supply to the demand. A ship comprising the liquefied gas storage tank of any one of claims 1, 2 and 4.

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