KR20190120621A - Liquefied Gas Storage Tank and Gas Treatment System and Vessel having the same - Google Patents

Abstract

According to one embodiment of the present invention, a liquefied gas storage tank, which forms an interface part by stored liquefied gas, includes a sloshing preventing device provided on the interface part and preventing sloshing of the liquefied gas, wherein the sloshing preventing device includes: an insulation part floating on the interface part of the liquefied gas; first and second metal parts formed on an upper side and a lower side of the insulation part; and a corrugation part formed on a lower side of the second metal part to come in contact with the interface part and preventing contraction or expansion of the second metal part.

Description

Liquefied Gas Storage Tank and Gas Treatment System and Vessel having the same}

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

In addition, the present invention has been carried out with the support of the Ministry of Land, Infrastructure and Transport / Ministry of Land, Infrastructure and Transport.

A ship is a means of transporting the ocean carrying large quantities of minerals, crude oil, natural gas, or thousands of containers. It is made of steel and is buoyant and floats on the water surface by buoyancy. Go through.

These vessels generate thrust by driving the engine, where the engine uses gasoline or diesel to move the piston so that the crankshaft is rotated by the reciprocating motion of the piston, causing the shaft connected to the crankshaft to rotate to propel the propeller. It was common.

However, in recent years, 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 promote various vessels such as LNG carriers and container carriers. It is used.

When the liquefied gas is stored in the liquid phase, as heat penetrates into the liquefied gas storage tank, some liquefied gas is vaporized to produce a boiled off gas, which is a natural boiled off gas (NBOG). ), Which can cause problems with the liquefied gas treatment system, and in the past, the method of exhausting and burning the boil-off gas to the outside (in the past, the boil-off gas was simply discharged to the outside to reduce the risk of damage to the tank by lowering the tank pressure). We tried to solve the problem by consuming.

However, this causes problems of environmental pollution and waste of resources. Therefore, in order to solve this problem fundamentally, numerous researches and developments have been made on the technology of reducing the Boil-Off Rate (BOR), which is the rate at which liquefied gas naturally generates evaporated gas in the liquefied gas storage tank. It's going on.

The present invention has been made to improve the prior art, an object of the present invention is to reduce the occurrence rate of the evaporated gas in the liquefied gas storage tank, to easily detect the breakage of the liquefied gas storage tank and to easily repair, liquefied The present invention provides a liquefied gas storage tank capable of efficiently treating a liquefied gas or an evaporated gas in a gas storage tank, and a gas treatment system and a ship including the same.

The liquefied gas storage tank according to the present invention, in the liquefied gas storage tank for forming the interface portion by the stored liquefied gas, the sloshing prevention device disposed on the interface portion to prevent sloshing of the liquefied gas, The sloshing prevention device includes a heat insulating part floating on an interface part of the liquefied gas; First and second metal parts formed above and below 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, the anti-sloshing device further includes a shock absorber to mitigate the shock, the shock absorber may be formed on the inner wall of the liquefied gas storage tank facing the anti-sloshing device.

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

Specifically, the pump including the liquefied gas storage tank, disposed in the pump tower for supplying the liquefied gas to the demand destination; And a vaporizer for receiving the liquefied gas from the pump to vaporize and supply the liquefied gas to the demand destination.

Specifically, it may be a ship comprising the liquefied gas storage tank.

The liquefied gas storage tank according to the present invention, and a gas treatment system and a ship including the same, build a fixed pump and a vertical movable pump in the liquefied gas storage tank, and use the vertical movable pump to direct the liquefied gas near the interface of the liquefied gas. It is possible to consume the liquefied gas in the thermal stratification section preferentially, which can reduce the generation rate of the evaporated gas in the liquefied gas storage tank and minimize the construction cost.

In addition, the liquefied gas storage tank according to the present invention, and the gas processing system and ship including the same, by installing a suction device that can suck the evaporated gas in the liquefied gas storage tank in the lower portion of the liquefied gas storage tank, evaporation at a relatively high temperature Since the gas can be supplied near the interface of the liquefied gas, the thermal load of the liquefied gas storage tank can be reduced to reduce the generation rate of the evaporated gas in the liquefied gas storage tank, and the system can be simplified to minimize the construction cost. .

In addition, the liquefied gas storage tank according to the present invention, the gas treatment system and the ship comprising the same, by building a sloshing prevention device of the floating form at the interface of the liquefied gas stored in the liquefied gas storage tank, the sloshing at the liquefied gas interface Since it is possible to prevent the phenomenon, it is possible to reduce the generation rate of the boil-off gas in the liquefied gas storage tank and to minimize the construction cost by the simple system.

In addition, the liquefied gas storage tank and the gas processing system and ship including the same according to the present invention, it is possible to easily detect the breakage of the heat insulating material by building a fine tube-shaped pipe part containing the pigment on the outer surface of the heat insulating material of the liquefied gas storage tank There is an effect that can be easily repaired accordingly.

In addition, the liquefied gas storage tank according to the present invention and the gas treatment system and the ship comprising the same, regardless of the internal pressure of the liquefied gas storage tank through the suction device can be supplied to the boiler by treating the evaporated gas in the liquefied gas storage tank, 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 treatment system according to an embodiment of the present invention.
2 is a conceptual diagram of a gas treatment system according to an embodiment of the present invention.
3 is a conceptual diagram of a gas treatment system according to another embodiment of the present invention.
4 is a conceptual view 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 of the liquefied gas storage tank.
FIG. 6 is an enlarged view of a portion B of FIG. 5.
7 is a conceptual diagram of a gas treatment 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 the preferred embodiments associated with the accompanying drawings. In the present specification, in adding reference numerals to the components of each drawing, it should be noted that the same components as possible, even if displayed on different drawings have the same number as possible. In addition, in describing the present invention, if it is determined that the detailed description of the 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, it may mean LNG (Liquefied Natural Gas), and the evaporated gas may mean BOG (Boil Off Gas), which is natural vaporized LNG.

Liquefied gas may be referred to regardless of the change of state, such as liquid state, gas state, liquid and gas mixed state, subcooled state, supercritical state, etc., it is also known that evaporated gas is the same. In addition, the present invention is not limited to the liquefied gas to be treated, it may be a liquefied gas treatment system and / or boil-off gas treatment system, it is apparent that the system of each of the drawings to be carried out can be applied to each other. In addition, the mixed fluid described below may be a mixed boil-off gas or a fluid containing at least some liquid phase.

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

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

1 is a conceptual diagram of a vessel having a liquefied gas storage tank and a gas treatment system according to an embodiment of the present invention, Figure 2 is a conceptual diagram of a gas treatment system according to an embodiment of the present invention.

As shown in FIG. 1 and FIG. 2, the gas treatment system 2 according to an embodiment of the present invention includes a liquefied gas storage tank 10, first and second pumps 21 and 22, and a guide structure 23. And a vessel 1 including a vaporizer 30, a demand source 40, and a controller 50, the gas treatment system 2 installed thereon is formed on the upper deck D and the upper deck D and formed on the stern side. The chimney (Ch) and the cabin (C), which is formed on the stern side, the engine deck (ER) is provided with the propulsion engine 41 and the upper deck (D) is formed by the liquefied gas storage tank (10) formed in the center side The ship has a hull 1a composed of an inner portion (not shown) and the like.

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

Prior to describing the individual configurations of the gas treatment system 2 according to the embodiment of the present invention, basic flow paths for organically connecting the individual components will be described. Here, the flow path may be a line through which the fluid flows, but is not limited thereto, and any flow path may be used.

In the embodiment of the present invention, it may further include a liquefied gas supply line (L1), a mobile liquefied gas supply line (L1a) and a fixed liquefied gas supply line (L1b). Each line may be provided with valves (not shown) that can adjust the opening degree, and the supply amount of the boil-off gas or liquefied gas may be controlled by adjusting 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 to the demand destination 40, and may include a vaporizer 30.

The liquefied gas supply line L1 may be formed by joining the mobile liquefied gas supply line L1a and the fixed liquefied gas supply line L1b to each other, and requesting the liquefied gas stored in the liquefied gas storage tank 10 to the destination 40. ) Can be supplied.

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

The fixed liquefied gas supply line L1b is connected to the first pump 21 and joined with the mobile liquefied gas supply line L1a to supply the liquefied gas stored in the liquefied gas storage tank 10 to the demand destination 40. have.

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

The liquefied gas storage tank 10 stores the liquefied gas to be supplied to the demand destination 40. The liquefied gas storage tank 10 should store the liquefied gas in a liquid state. In this case, the liquefied gas storage tank 10 may have a pressure tank form.

The liquefied gas storage tank 10 is disposed inside the hull 1a and may be formed of, for example, four. In addition, the liquefied gas storage tank 10 is, for example, a membrane type tank, but not limited thereto, and various types such as a stand-alone tank are not particularly limited.

In the liquefied gas storage tank 10, liquefied gas having the interface portion I is stored therein, and boiled gas (BOG) is generated above the interface portion I, and under the interface portion I, the liquefied gas ( LNG) is stored.

In the present invention, the liquefied gas storage tank 10 may be in the form of an independent tank. The following description will be given in the case of an independent tank type.

The liquefied gas storage tank 10 includes an outer tank (not shown), an inner tank (not shown), and a heat insulating part (not shown). The outer tank is a structure forming the outer wall of the liquefied gas storage tank 10, it may be formed of steel, the cross section may be a polygonal shape.

The inner tank is provided inside the outer tank, and may be supported and installed inside the outer tank by a support (not shown). At this time, the support may be provided at the lower end of the inner tank, of course, may 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 (for example, 6 bar). The inner tank is designed to withstand a certain pressure, because the internal pressure of the inner tank can be increased as the liquefied gas provided in the inner tank is evaporated to generate the evaporated gas.

A baffle (not shown) may be provided inside the inner tank. The baffle refers to a lattice-shaped plate, and as the baffle is installed, the pressure inside the inner tank may be evenly distributed to prevent the inner tank from being concentrated at a portion.

The heat insulating part may be provided between the inner tank and the outer tank, and may block external heat energy from being transferred to the inner tank. In this case, the heat insulating part may be in a vacuum state. By forming the heat insulating part in a vacuum, the liquefied gas storage tank 10 can withstand high pressure more efficiently as compared with a general tank. For example, the liquefied gas storage tank 10 may withstand the pressure of 5bar to 20bar through the heat insulating portion of the vacuum.

As described above, in the present invention, by using the pressure tank-type liquefied gas storage tank 10 having a vacuum insulation portion between the outer tank and the inner tank, the generation of the boil-off gas can be minimized and the liquefied gas is stored even if the internal pressure rises. It is possible to prevent a problem such as damage to the tank 10 from occurring.

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 and extends to the bottom surface (not shown) of the liquefied gas storage tank 10, and includes a 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 liquefied gas to the demand destination 40.

Specifically, the first pump 21 is built in a fixed state below the pump tower 11, and can suck and supply only the liquefied gas stored in the lower portion of the liquefied gas storage tank 10 to supply to the demand destination 40. .

The second pump 22 is arranged to be movable in the liquefied gas storage tank 10 to supply the liquefied gas to the demand destination 40, and moves the liquefied gas while moving together as the position of the interface portion I changes. Supply to the demand destination (40).

Specifically, the second pump 22 is movably connected to the guide structure 23 disposed in the pump tower 11, and may move up and down or left and right 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 up and down direction in FIG. 2, the guide structure 23 is not limited thereto and may also be formed in the horizontal direction.

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

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

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

In the present invention, the type is not limited, and any device can be used as long as it can consume liquefied gas.

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

The control unit 50 may further include a sensor unit 51 for measuring the 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 the up and down temperature distribution information 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 the second pump 22 at the position where the highest temperature is formed among the vertical temperature distributions measured by the sensor unit 51. The position of the second pump 22 can be controlled to move.

Usually, the liquefied gas stored in the liquefied gas storage tank 10 has a higher temperature than the lower portion thereof to generate boil-off gas. As such, since the temperature is substantially high near the interface portion I of the liquefied gas, the liquefied gas near the interface portion I can be used before the lower liquefied gas, thereby consuming the liquefied gas in the thermal stratification section. As a result, the thermal load of the liquefied gas storage tank is reduced, and thus the amount of generated boil-off gas is reduced.

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

Here, the control part 50 may move the position of the 2nd pump 22, and may operate the 2nd pump 22 in preference to the 1st pump 21, and the up-and-down temperature distribution may differ by less than preset temperature. In this case, the first pump 21 and the second pump 22 may be operated simultaneously.

As described above, in the present invention, the driving position of the second pump 22, that is, the position where the second pump 22 sucks the liquefied gas is positioned in the liquefied gas thermal stratification section, and the line consumption of the liquefied gas in the liquefied gas thermal stratification section is consumed. It is possible to reduce the thermal load in the liquefied gas storage tank and thereby reduce the evaporation gas generation rate.

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

Through this, in the present invention, the second pump 21 can be driven even if the first pump 21 malfunctions, thereby maintaining the reliability of supplying the liquefied gas.

Thus, the gas treatment system 2 and the ship 1 including the same according to the present invention, by establishing a fixed pump 21 and a vertical movable pump 22 in the liquefied gas storage tank 10, the interface of the liquefied gas The liquefied gas in the vicinity of the part (I) can be pre-consumed through the vertical movable pump 22, so that the liquefied gas in the thermal stratification section can be preferentially consumed, and thus the generation rate of the boil-off gas in the liquefied gas storage tank 10 is generated. It is effective to reduce the cost and minimize 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 exemplary 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 a suction. It includes a fluid supply line 62, the boil-off gas suction line 63 and the mixed fluid discharge line (64).

Here, the configuration of 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 may include the gas treatment system 2 described with reference to FIG. 2. The same reference numerals may be used for the same components and conveniences, but are not necessarily referring to the same configuration.

Hereinafter, a vessel 1 including a gas treatment system 2 according to an 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 will be replaced with this.

The pump 20 is arrange | positioned in the position where the liquefied gas below the interface part I was stored, 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 submerged.

The suction device 60 receives the liquefied gas from the pump 20 to suck the evaporated gas formed in the upper portion of the interface portion I, mixes the supplied liquefied gas and the sucked evaporated gas, and stores the liquefied gas storage tank 10. To the bottom of the The suction device 60 here 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, an evaporation 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 a liquefied gas supplied from the pump 20.

The suction fluid supply line 62 connects the boil-off gas suction line 63 and the suction device 60 to supply the boil-off gas sucked by the boil-off gas suction line 63 to the suction device 60.

The boil-off gas suction line 63 may be disposed above the interface part I to suck the boil-off gas, and horizontally above the interface part I by, for example, a pump tower 11 (shown in FIG. 2). It is installed, it is connected to the suction fluid supply line 62 can transfer the sucked evaporated 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. At this time, the end of the mixed fluid discharge line 64, the liquefied gas storage tank 10 may be disposed.

As described above, the gas treatment system 2 and the vessel 1 including the same include a suction device 60 capable of sucking the boil-off gas in the liquefied gas storage tank 10 and a liquefied gas storage tank 10. It can be installed at the lower portion of the liquefied gas storage tank 10 by reducing the thermal load of the liquefied gas storage tank 10 because the relatively high temperature can be supplied to the liquefied gas storage tank 10 far away from the interface (I) of the liquefied gas It is effective in reducing the incidence rate and minimizing the construction cost.

4 is a conceptual view 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.

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

Here, the components other than the sloshing prevention device 12 and the shock absorber 13 may use the same reference numerals for convenience of the respective components in the gas treatment system 2 described with reference to FIGS. 2 and 3, but the same components are not necessarily referred to. no.

Hereinafter, the gas treatment system 2 and the vessel 1 including the liquefied gas storage tank 10 according to the 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 Figure 2 will be replaced with this.

The sloshing prevention device 12 is disposed on the interface portion I to prevent sloshing of the liquefied gas and can be arranged 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 a low thermal conductivity polyurethane foam (PUF-45) and plywood to block an external heat source supplied to the interface part I, and may include an interface part of a liquefied gas ( I) may have a density of 45 kg / m 3 less than the density of liquefied gas (450 kg / m 3) 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 portion (I) can effectively prevent the generation of the boil-off gas.

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

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

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

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

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

Through this, it is possible to prevent the degradation of stability through the impact of the liquefied gas storage tank 10.

As such, the liquefied gas storage tank 10 and the gas treatment system 1 and the vessel 1 including the same according to the present invention are floating on the interface portion I of the liquefied gas stored in the liquefied gas storage tank 10. It is possible to prevent sloshing at the liquefied gas interface by constructing a sloshing prevention device of the form 12, thereby reducing the generation rate of the boil-off gas in the liquefied gas storage tank 10 and simplifying the system to minimize the construction cost. It can be effective.

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, to improve the stability of the liquefied gas storage tank 10 through the shock absorber 13, By preventing the sloshing through the sloshing prevention device 12 there is also an effect that can improve the stability of the liquefied gas storage tank (10).

5 is a conceptual diagram of a liquefied gas storage tank according to another embodiment of the present invention, (a) is a perspective view of a liquefied gas storage tank, (b) is a cross-sectional view of the liquefied gas storage tank, Figure 6 An enlarged view of part B.

5 and 6 and the liquefied gas storage tank 10 according to an embodiment of the present invention, the heat insulating portion 101, the first tube fiber portion 101a and the second tube fiber portion 101b. do.

The components other than the heat insulating portion 101, the first tube fiber portion 101a, and the second tube fiber portion 101b are denoted by the same reference numerals for convenience as the respective components in the gas treatment system 2 described with reference to FIGS. Although it may be used, it does not necessarily refer to the same configuration.

Hereinafter, a gas treatment system 2 and a vessel 1 including a 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 forms an outer surface by a double wall formed by the inner wall 10a and the outer wall 10b and stores the liquefied gas inside the inner wall 10a and between the inner wall 10a and the outer wall 10b. Insulating portion 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. Inside the heat insulating portion 101 may be formed tube fibers (101a, 101b) containing at least one pigment so as to determine the damage location when the heat insulating portion 101 is broken.

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

The tubular fiber portions 101a and 101b have at least a breakdown strength range of the heat insulation portion 101 so that the breakdown strength is destroyed together with the heat insulation portion 101 to grasp the damage position when the heat insulation portion 101 breaks. It can be designed to include some.

The first tubular fiber portion 101a is formed in a tubular shape inside the heat insulating portion 101, and a first dye may be accommodated therein, and the second tubular fiber portion 101b may include a heat insulating portion 101. It is formed in a tubular shape in the interior of the second pigment may be accommodated.

Here, the first and second pigments may have different colors, and the color of the first and second pigments may be easily and quickly found by designating the color for each position.

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

The first tube fiber portion 101a and the second tube fiber portion 101b may be formed in close contact with each other so that the two pigments may react with each other when the heat insulation portion 101 is damaged or damaged.

Here, the first and second pigments may be foamed by reacting with each other, for example, to form a polyurethane foam (PUF).

Through this, in the present invention, when the heat insulating part 101 is damaged and the first and second tubular fiber parts 101a and 101b are damaged, the first and second pigments flow out to react with each other, and the reaction of the two pigments is performed. By repairing the damaged position of the heat insulating portion 101 by itself can maximize the safety of the liquefied gas storage tank (10).

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 vessel 1 including the same according to the present invention have a fine tube shape in which a pigment is contained in the heat insulating part 101 of the liquefied gas storage tank 10. By building the tubular fiber portion (101a, 101b) of the heat insulating portion 101 can be easily detected whether the breakage, and accordingly there is an effect that can be easily repaired.

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

7 and the gas treatment system 2 according to the embodiment of the present invention, the liquefied gas storage tank 10, the pump 20, the vaporizer 30, the customer 40, the suction device 70 and 1st to 4th valves 81-84 are included.

The liquefied gas storage tank 10, the pump 20 and the vaporizer 30 may be the same reference numerals for convenience and the same configuration in the gas treatment system 2 described in Figures 2 to 6, but the same configuration It 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 treatment system 2 according to an embodiment of the present invention will be described with reference to FIG. 7.

Prior to describing the individual configurations of the gas treatment system 2 according to the embodiment of the present invention, basic flow paths for organically connecting the individual components will be described. Here, the flow path may be a line through which the fluid flows, but is not limited thereto, and any flow path may be used.

In the embodiment of the present invention, liquefied gas supply line (L1), boil-off gas supply line (L2), first branch line (L3), power generation engine fuel supply line (L3a), second branch line (L4) and bypass It may further include a line BL. Each line may be provided with valves (not shown) that can adjust the opening degree, and the supply amount of the boil-off gas or liquefied gas may be controlled by adjusting the opening degree of each valve.

The liquefied gas supply line L1 connects the liquefied gas storage tank 10 and the propulsion engine 41, may include a pump 20 and a vaporizer 30, and may be stored in the liquefied gas storage tank 10. Liquefied gas can 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 the liquefied gas storage tank 10. Evaporated gas generated in the can be supplied to the boiler 43. Here, the first valve 81 may be a check valve.

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

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

The second branch line L4 is branched downstream of the vaporizer 30 on the liquefied gas supply line L1 and connected to the boiler 43, and may include a fourth valve 84, and in the vaporizer 30. At least a portion of the vaporized liquefied gas may be supplied to the boiler 43. Here, the fourth valve 84 may be controlled to supply the amount of boil-off gas or liquefied gas according to 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, may include a bypass valve 71, and may be seen in the suction device 70 ( The remaining mixed fluid supplied to 43 may be bypassed from the rear end of the suction device 70 to the front end. Here, the bypass valve 71 may be controlled to supply the amount of boil-off gas or liquefied gas in accordance with the opening degree of the valve.

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

The customer 40 may receive and consume the liquefied gas stored in the liquefied gas storage tank 10 or the liquefied gas generated in the liquefied gas storage tank 10, and consume the liquefied gas or the boiled gas as a raw material. Driven.

In other words, the demand destination 40 may include all devices and mechanisms that require liquefied gas and are driven using it as a raw material. However, in the embodiment of the present invention, the demand source 40 may be the propulsion engine 41, the power generation engine 42, and the boiler 43.

The propulsion engine 41 generates thrust in the vessel 1, and may consume, for example, boil-off or liquefied gas having a pressure of 10 to 20 bar (preferably 17 bar). The propulsion engine 41 is a low pressure gas injection engine, and may be a low speed 2-stroke low pressure gas injection engine (XDF).

The low speed two-stroke low pressure gas injection engine 41 has a crank shaft connected to the piston as the piston (not shown) inside the cylinder (not shown) reciprocates by combustion such as liquefied gas, evaporated gas or oil. May be rotated, and a shaft (not shown) connected to the crankshaft may be rotated. Therefore, as the propeller (not shown) connected to the shaft rotates when the low speed 2-stroke low pressure gas injection engine 41 is driven, the vessel 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 the top dead center, and at the moment of ignition by the ignition fuel from the outside at the compression top dead center. -Allow the fuel mixture to burn completely to generate explosive power. In this case, the air-fuel mixture mass ratio may be less than 14.7: 1, and may be in the form of a lean burn engine.

At this time, the ignition fuel uses HFO (Heavy Fuel Oil) or MDO (Marine Diesel Oil), and the ratio of the ignition fuel and the high pressure gas is about 1:99.

The low speed 2-stroke low pressure gas injection engine 41 may generate power by receiving liquefied gas of 8 bar to 20 bar (preferably 17 bar), and the state of the supplied liquefied gas is a low speed 2-stroke low pressure gas injection engine 41. This may vary depending on the state required.

In large ships, thrust is generated through a MEGI engine (not shown). However, in the embodiment of the present invention, a low-speed two-stroke low pressure gas injection engine 41 is used as an engine generating thrust of the ship 1. Benefits are created.

MEGI engines require a high pressure with a supply fuel pressure of about 200 bar to 300 bar required to drive, which requires a considerable amount of power for driving of about 210 KW to 220 KW (about 215 KW).

On the other hand, the low-speed two-stroke low pressure gas injection engine 41 has a low pressure at a pressure of 8 bar to 20 bar (preferably 17 bar) for supplying fuel, and consumes about 13 KW to 17 KW (about 15 KW). Compared to MEGI engine, much power can be reduced.

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

The low-speed two-stroke low pressure gas injection engine 41 has an advantage that the driving pressure is low and the fuel supply system is very simple and occupies little space.

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

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

Heterogeneous fuel engine (DFDE) 42 may be an engine for generating power or other power. The heterogeneous fuel engine 42 may be selectively supplied with liquefied gas or fuel oil (oil) without being supplied with a mixture of liquefied gas and fuel oil. This is to prevent two materials having different combustion temperatures from being mixed and supplied, thereby preventing the engine from falling in efficiency.

The boiler 43 may receive and consume boil-off gas or liquefied gas having a pressure lower than that of the propulsion engine 41, and consume fuel having a pressure lower than that of the power generation engine 42. Can be.

The suction device 70 receives the liquefied gas from the liquefied gas supply line L1 and sucks the evaporated gas generated in the liquefied gas storage tank 10 through the evaporated gas supply line L2 to liquefy the boiler 43. The mixed fluid in which the gas and the boil-off gas are mixed is supplied, and the suction device 70 transfers the boil-off gas 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 liquefied gas vaporized by the first branch line L3 branched downstream of the vaporizer 30 on the liquefied gas supply line L1.

As described above, in the present invention, the suction device 70 supplies the mixed fluid only to the boiler 43, not the power generation engine 42, thereby effectively treating the boil-off gas without a separate compressor.

The suction device 70 is a rear end of the suction device 70 through the bypass line BL when the flow rate of the mixed fluid supplied to the boiler 43 is greater than the flow rate consumed by the boiler 43. It can be bypassed to shear at.

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

The first valve 81 prevents the mixed fluid, which is bypassed from the rear end of the suction device 70 to the front end by the bypass line BL and the suction device 70, to flow back to the liquefied gas storage tank 10. It may be, 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 such, the gas treatment system 2 and the vessel 1 including the same according to the present invention are evaporated 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 the 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, and should be understood by those skilled in the art within the technical spirit of the present invention. It is obvious that the modifications and improvements are possible.

All simple modifications and variations of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be apparent from the appended claims.

1: Ship 1a: Hull
2: gas treatment system 10: liquefied gas storage tank
10a: inner wall 10b: outer wall
101: heat insulation portion 101a: first tube fiber portion
101b: second tube fiber portion 11: pump tower
12: sloshing prevention device 121: first metal part
122: heat insulation portion 123: second metal portion
124: corrugation unit 13: shock absorber
21: first pump 22: second pump
23: guide structure 30: carburetor
40: demand source 41: propulsion engine
42: power generation engine 43: boiler
50: control unit 51: sensor unit
60: suction device 61: drive 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: boil-off gas supply line L3: first branch line
L3a: Power 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 for forming an interface portion by the stored liquefied gas,
A sloshing prevention device disposed on the interface to prevent sloshing of the liquefied gas;
The sloshing prevention device,
A heat insulating part floating on an interface part of the liquefied gas;
First and second metal parts formed above and below the heat insulating part; And
A liquefied gas storage tank, characterized in that formed in the lower side of the second metal portion and abutting the interface portion, the corrugation portion for preventing the contraction or expansion of the second metal portion. The method of claim 1,
The insulation part is composed of polyurethane foam (PUF) and plywood (Plywood),
The first and second metal liquefied gas storage tank, characterized in that consisting of stainless steel. The method of claim 2,
Further comprising a shock absorber to mitigate the impact of the anti-sloshing device,
The shock absorber,
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 3, wherein
The sloshing prevention device is a liquefied gas storage tank, characterized in that fixed by the pump tower. Claims 1 to 4 including the liquefied gas storage tank of any one of claims,
A pump disposed in the pump tower to supply the liquefied gas to a demand destination; And
And a vaporizer which receives the liquefied gas from the pump and vaporizes the liquefied gas to supply the demanded gas. A ship comprising the liquefied gas storage tank according to any one of claims 1 to 4.

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