WO2020026377A1

WO2020026377A1 - Floating facility

Info

Publication number: WO2020026377A1
Application number: PCT/JP2018/028856
Authority: WO
Inventors: 圭史谷川; 和亮角田
Original assignee: 日揮グローバル株式会社
Priority date: 2018-08-01
Filing date: 2018-08-01
Publication date: 2020-02-06
Also published as: CN111465553B; CN111465553A; KR102172666B1; KR20200072558A

Abstract

[Problem] To provide a technique for suppressing the effect of leakage of a flammable substance in a floating facility provided with a natural gas liquefaction apparatus. [Solution] A floating facility 1 is provided with a natural gas liquefaction apparatus, a hot-end part 2 is disposed in a position close to a dwelling section in a float part 11 having a planar shape which is longer in a boat length direction than in the boat width direction, and a cold-end part 3 is disposed in a position closer to a turret 12 than the hot-end part 2. In the cold-end part 3, distillation towers 341, 342, 343 for distilling liquid hydrocarbon components separated from natural gas, and a main cryogenic heat exchanger 321 for liquefying the natural gas are installed in mutually different modules 30, and the arrangement position of the modules 30 is selected so that the effects of leakage of a flammable substance, explosion, or fire can be suppressed.

Description

Floating equipment

The present invention relates to a technology for disposing a natural gas liquefaction apparatus on a floating facility.

As a facility for liquefying natural gas produced from an underwater gas field, a floating body such as a hull is arranged on the sea near the gas field, and FLNG (Floating LNG) is provided with a natural gas liquefaction device on the floating body. Floating body equipment called is known.

The natural gas liquefaction device installed on the floating body is a device for performing pretreatment for removing various impurities from natural gas before liquefaction, and cooling / liquefying natural gas after pretreatment to LNG (Liquidized). It is equipped with a number of equipment such as equipment for performing liquefaction processing to obtain Natural Gas.

Here, FLNG often produces LNG in an area isolated from the surroundings, and receives support from the outside in the event of a leak of flammable substances such as natural gas or LNG, or an explosion or fire. Fire fighting can be difficult. For this reason, it is preferable that the natural gas liquefaction device provided on the floating body is provided with a device arrangement that can easily suppress the influence of explosion and the spread of fire.

In this regard, for example, in Non-Patent Document 1, when a group of devices related to pretreatment or liquefaction is divided into a plurality of modules for each predetermined process and arranged on the floating body, it is called a safety gap between adjacent modules. A technique for establishing a safe area (vacant lot) is described. The safety area prevents leaked combustible substances (flammable gas or flammable liquid vaporized substances) from entering the gaps in the equipment group and spreading at high speeds. Promotes exhaust to the outside of the substance. As a result, it is possible to effectively reduce the effect of the explosion and prevent the spread of the fire.

On the other hand, Non-Patent Document 1 discloses how to distribute a large number of devices constituting a natural gas liquefaction device to a plurality of modules, and how to arrange these modules with each other. Nothing is said to be effective in preventing the spread of explosions and fires associated with the leak.

The present invention has been made under such a background, and provides a technology for suppressing the influence of the occurrence of leakage of combustible substances in a floating facility equipped with a natural gas liquefaction apparatus.

The floating facility of the present invention is a floating facility equipped with a natural gas liquefaction device,
A floating body disposed on the sea and having a planar shape longer in the ship length direction than in the ship width direction,
One end of the floating body when viewed along the vessel length direction, provided outside the body of the floating body, mooring the floating body, and connected to a riser for underwater transport of natural gas. Turret,
A living part provided on the other end side of the floating body part opposite to the one end side,
A berthing position that is provided along the length direction of the floating body portion and makes a liquefied natural gas carrier berthing,
A hot end section provided on the floating body section between the turret and the living section, the processing section including a processing device for processing natural gas received through the riser in a gaseous state; and a carbonization section obtained from the natural gas. A cold end unit including a processing device that handles liquid hydrogen, and a natural gas liquefaction device including:
The hot end portion is arranged at a position closer to the living portion in the master direction, and the cold end portion is arranged at a position closer to the turret than the hot end portion,
The cold end unit is divided into a plurality of sets of modules in which a device group including a processing device for processing the hydrocarbon liquid is installed, and these modules are arranged side by side.
In the plurality of modules, a distillation column for distilling a liquid hydrocarbon component separated from the natural gas and a main cryogenic heat exchanger for liquefying the natural gas are installed in different modules. Being done,
The module including the main cryogenic heat exchanger is arranged in a region on the opposite side of the center position in the ship width direction as viewed from the berthing position,
A module including the distillation column is disposed at a position closer to the turret in the cold end portion.

The floating facility may have the following features.
(A) The module including the distillation column is disposed in a region on the near side with respect to the center position in the boat width direction when viewed from the berthing position.
(B) A utility section including a device group for supplying utilities is arranged between the living section and the hot end section.
(C) a distillation column installed in a module different from the module in which the main cryogenic heat exchanger is installed, a deethanizer for distilling and separating ethane from a liquid hydrocarbon component having 2 or more carbon atoms, and a liquid hydrocarbon component. And at least one of a depropanizer for distilling and separating propane from water and a debutanizer for distilling and separating butane from the liquid hydrocarbon component. At this time, three distillation columns, which are the deethanizer, depropanizer, and debutanizer, are included, and a plurality of these distillation columns are installed in a common module. Alternatively, three distillation columns, which are the deethanizer, depropanizer, and debutanizer, are included, and two of these distillation columns and one of the remaining distillation columns are installed in different modules. At this time, a demethanizer for distilling and separating the natural gas into methane gas and a liquid hydrocarbon component having 2 or more carbon atoms is installed in the module in which the one distillation column is installed.

The present invention focuses on a distillation column and a main cryogenic heat exchanger, which have a large capacity of the liquid, among processing equipment in a cold end section which handles a hydrocarbon liquid which is a large-scale leakage source of a combustible substance. , Are arranged in different modules. Furthermore, for the module including the distillation column and the module including the main cryogenic heat exchanger, an arrangement position that can suppress the influence of leakage of combustible materials, explosion, or fire is selected.

It is a block diagram showing various processing parts implemented in a natural gas processing unit. FIG. 3 is a plan view showing an arrangement of each unit provided in the FLNG according to the embodiment. FIG. 3 is a first side view showing an arrangement of each part on the FLNG. FIG. 5 is a second side view showing the arrangement of each part on the FLNG. It is a top view showing the 1st example of arrangement of the cold end part containing a plurality of modules. It is a top view showing the 2nd example of arrangement of the cold end part. It is a top view showing the 3rd example of arrangement of the cold end part. It is a top view showing the 4th example of arrangement of the cold end part. FIG. 4 is a plan view of FLNG with a module integrated with a pipe rack. FIG. 3 is a side view of the integrated module. It is a top view which shows the example of arrangement | positioning of the cold end part containing an integrated type module.

FIG. 1 is a block diagram illustrating a flow of processing performed by a natural gas (NG) liquefaction apparatus provided on a hull 11 which is a floating body of the FLNG 1.
The NG liquefaction apparatus of this example separates and liquefies methane contained in NG.

Ｎ As shown in FIG. 1, after the liquid contained in the NG is separated by the gas-liquid separation unit 21, the NG is subjected to a pretreatment for removing various impurities. From the NG from which the liquid has been separated, first, the acidic gas is removed by the acidic gas removing unit 22. The acid gas removing unit 22 is constituted by, for example, an absorption facility provided with a contact tower that makes a countercurrent contact between the absorbing liquid that absorbs the acidic gas and the natural gas, and is made of an acidic gas that may solidify in LNG during liquefaction. Certain carbon dioxide and hydrogen sulfide are absorbed and removed from natural gas into the absorbent.

The NG treated in the acid gas removing unit 22 is further subjected to moisture removal in the moisture removing unit 23, and then mercury is removed in the mercury removing unit 24.
Each of the water removing unit 23 and the mercury removing unit 24 includes, for example, an adsorption tower filled with an adsorbent that adsorbs moisture and a mercury adsorbent that adsorbs mercury.
The gas-liquid separation unit 21, the acid gas removal unit 22, the water removal unit 23, and the mercury removal unit 24 described above separate the liquid in NG before cooling and remove impurities from the gas. The whole of the

units

21, 22, 23, 24 is also called a hot end unit 2.
In addition, the mercury removing unit 24 may be placed before the acidic gas removing unit 22.

Next, the natural gas from which the impurities have been removed is cooled and separated into methane and heavy hydrocarbons, which are liquid hydrocarbon components having 2 or more carbon atoms, in the hydrocarbon separation unit 31. The hydrocarbon separation unit 31 is provided with a demethanizer, for example, a distillation column.

メタン The methane separated in the hydrocarbon separation unit 31 is cooled and liquefied in the liquefaction unit 32 to become liquefied natural gas (LNG). The liquefaction unit 32 includes a main cryogenic heat exchanger (MCHE: Main Cryogenic Heat Exchanger) for liquefying methane using a main refrigerant (a mixed refrigerant composed of methane, ethane, propane, butane, and nitrogen or a nitrogen refrigerant). Is provided. The main cryogenic heat exchanger (MCHE) refers to a heat exchanger of a spiral wound type or a cold box type.

{Circle around (2)} The heavy hydrocarbon having 2 or more carbon atoms separated from methane in the hydrocarbon separation unit 31 is sequentially separated by distillation in the distillation unit 34 into ethane, propane, and butane. Lights containing ethane and a small amount of methane are returned to the liquefaction unit 32, and propane and butane are used in the FLNG1 as LPG (some ethane is also used as a refrigerant in the FLNG1) or shipped. The remaining heavy components are sent to a condensate tank 43 described later as condensate. The distillation unit 34 is provided with a deethanizer, a depropanizer, and a debutanizer, which are distillation columns for performing ethane, propane, and butane distillation separation.

The LNG is then sent to an LNG tank 44 provided in the floating body 11 through an end flash unit 33 that adjusts the temperature of the LNG by vaporizing (end flash) a part of the LNG. The LNG stored in the LNG tank 44 is shipped to, for example, the LNG tanker 6.
Here, since the hydrocarbon separation unit 31, the liquefaction unit 32, the end flash unit 33, and the distillation unit 34 handle the cooled hydrocarbon liquid, the

processing units

31, 32, 33, and 34 as a whole are cold-end units. Also called 3.

A part of the liquid component (condensate) separated from the natural gas by the gas-liquid separation unit 21 is subjected to a process of removing light hydrocarbons in the vapor pressure adjustment unit 42, and then a condensate tank 43. Stored and shipped.
Further, the antifreeze containing water is phase-separated from the gas-liquid separated condensate, and the antifreeze is regenerated by the regenerating unit 41. Monoethylene glycol (MEG) or the like is used as the antifreeze, and the regenerated antifreeze is supplied to the natural gas well.

In addition, the end flash gas or the boil-off gas (BOG) evaporated from LNG in the LNG tank 44 is pressurized in a pressurizing section 45 such as a compressor, a part of which is used as a combustion gas, and the rest is used in a liquefaction section 32. It is returned to the entrance side.

In addition, the hull 11 of the FLNG 1 includes a turbine or generator for power generation, a power source for the turbine, a boiler for generating steam serving as a heat source for each distillation column, or a heating system for heating a heat medium such as hot water or hot oil. Utility devices are provided. In the FLNG 1 of this example, these utility equipment groups are arranged in a grouped area. Hereinafter, a group of utility devices arranged collectively in the area will be referred to as a utility unit 52.

居住 Furthermore, the hull 11 is provided with a living space 13 in which a worker who operates the FLNG 1 and the like lives. For example, the dwelling part 13 is constituted by a reinforced concrete building or a steel-frame concrete building having a plurality of floors.

Ｆ The FLNG 1 of the present example having the above-described configuration is provided with a device arrangement that is easy to suppress the influence of the explosion and the spread of the fire when a leak of a combustible substance, an explosion, or a fire occurs in the NG liquefaction apparatus. First, referring to the plan view of FIG. 2 and the side views of FIGS. 3 and 4, the NG liquefaction apparatus (hot end section 2, cold end section 3), utility section 52, and living section 13 on the hull 11 will be described. The schematic arrangement will be described. FIGS. 3 and 4 are side views as viewed from the positions indicated by A-A 'and B-B' in FIG. 2, respectively.

As shown in FIG. 2, the FLNG 1 of the present example is provided on a hull 11 having a planar shape that is longer in the length direction than in the width direction of the ship, on each of the units 2 and 3 of the NG pretreatment / liquefaction device, the utility unit 52, and the living unit 13 are arranged. The length of the FLNG 1 in the boat width direction is 50 to 60 m, and the length in the boat length direction is 300 to 400 m.
A turret support portion 123 is provided at the bow of the hull 11 so as to project laterally forward from the bow, and a turret 12 for mooring the hull 11 is provided at the turret support portion 123. I have. The turret 12 provided outside the main body of the hull 11 is called an external type (external turret).

A plurality of mooring lines 122 for mooring the hull 11 are provided from the turret 12 so as to extend toward the water bottom.
Further, the turret 12 is connected to a riser 121 for transporting NG produced in a gas field at the bottom of the water underwater. The NG received through the riser 121 is supplied to the gas-liquid separation unit 21 described with reference to FIG.

When the bow provided with the turret 12 is located at one end of the hull 11, the cold end 3, the hot end 2, the utility 52, and the like are provided on the hull 11 from one end to the other end in the length direction. And the living space 13 are arranged in this order. That is, the hot end portion 2 is arranged at a position closer to the living portion 13 of the hull 11 in the captain direction, and the cold end portion 3 is arranged at a position closer to the turret 12 than the hot end portion 2. A utility section 52 is arranged between the living section 13 and the hot end section 2.

Here, the cold end unit 3 is arranged on the hull 11 in a state in which the equipment groups included in the various processing units 31 to 34 described with reference to FIG. 1 are divided into a plurality of cold end modules 30. Similarly, in the hot end unit 2, the equipment group included in each of the processing units 21 to 24 is arranged on the hull 11 in a state of being divided into a plurality of hot end modules 20.

The “modules” of the cold end module 30 and the hot end module 20 incorporate a part of a device group included in each of the processing units 31 to 34 and 21 to 24 in a common frame having a height of about 30 to 40 m. This is the configured division unit (see also FIG. 10 described later). Within each module, there are also static devices such as towers and heat exchangers, dynamic devices such as pumps, connection pipes for connecting between each static device and the dynamic devices, and pipes of a pipe rack 51 described later. Many equipment groups are arranged.

For example, the modules (hot-end module 20 and cold-end module 30) are built in an external factory or the like, and the completed modules are installed on the hull 11 and connected to each other, so that the hot-end section 2 and the cold-end section 3 are formed. Is configured.
In the FLNG 1 illustrated in FIG. 2, the hot end unit 2 is configured by two sets of hot end modules 20, and the cold end unit 3 is configured by three sets of cold end modules 30.

In determining the positions of the hot end module 20 and the cold end module 30, the inventors have determined the properties of the fluid handled in the hot end section 2 and the fluid handled in the cold end section 3. We focused on the difference.
That is, in the hot end section 2, a pretreatment for removing various impurities from NG in a gas state is performed. For this reason, even if the flammable substance NG leaks in the hot end section 2, the volume-based diffusion amount of the flammable substance spread in the hot end section 2 is limited to the NG leakage from the hot end section 2. Almost equal to the quantity.

に対して On the other hand, the cold end section 3 handles liquid combustible substances such as LNG and LPG. When these liquids leak to the outside, they evaporate and increase in volume hundreds of times. For this reason, the volume-based diffusion amount of the combustible material when leakage occurs on the cold end portion 3 side may be significantly larger than when the leakage occurs on the hot end portion 2 side.

Therefore, the location of the FLNG 1 of this example is determined by focusing on the devices provided in the cold end module 30. Hereinafter, a method of determining the arrangement position of the cold end module 30 will be described with reference to FIGS.

In the FLNG 1 shown in FIGS. 2 to 4, the hot end module 20 and the cold end module 30 are located in a region sandwiched between the turret support portion 123 mounted on the bow side and the utility portion 52 provided on the stern side. Be placed. In this area, a pipe rack portion 51 is provided at a central position in the ship width direction so as to extend along the ship length direction. The pipe rack 51 is a frame structure that holds a group of pipes through which various fluids handled in the NG liquefaction apparatus flow.

The two sets of hot end modules 20 constituting the hot end unit 2 are arranged side by side in a region adjacent to the arrangement region of the utility unit 52 so as to sandwich the stern end of the pipe rack unit 51 from both the left and right sides. I have.

Further, the three sets of cold end modules 30 constituting the cold end unit 3 are distributed and arranged so as to sandwich the pipe rack unit 51 from both the left and right sides in a region closer to the bow than the region where the hot end module 20 is arranged. Have been.
More specifically, on the starboard side of the pipe rack portion 51 toward the bow side, in the region on the bow side adjacent to the hot end module 20, from the LNG tank 44 in the hull 11 to the LNG tanker (carrier) 6 A shipping facility 15 for shipping LNG to the destination is provided. Then, a cold end module 30c is disposed at a position adjacent to the ship equipment 15 on the bow side.

On the other hand, on the port side of the pipe rack portion 51 toward the bow side, a safety area 53 is provided in a region on the bow side adjacent to the hot end module 20. The

cold end modules

30b, 30a are arranged in this order at positions adjacent to the safety area 53 on the bow side.
The safety zone 53 plays a role in suppressing the leaked combustible material from entering the gap between the devices and moving at high speed. Further, a function is provided for promoting the exhaust of combustible substances to the outside by the wind blown into the safety area 53.

取扱 The handling amount of the combustible material in each of the

units

52, 20, and 30 increases in the order of the utility unit 52, the hot end module 20, and the cold end module 30. Therefore, the utility section 52 with a small amount of combustible material is arranged closest to the living space 13, and the hot-end module 20 and the cold-end module 30 are arranged at more distant positions in order of increasing the quantity of combustible material. Thereby, it is possible to reduce the influence on the living space 13 when the flammable substance leaks.

Further, a flare stack 141 for burning gas discharged from the FLNG 1 is arranged at the bow of the hull 11 farthest from the living space 13. The flare stack 141 is disposed on the port side bow of the hull 11, which is opposite to the pipe rack portion 51 (the center position in the boat width direction) when viewed from the berthing position of the LNG tanker 6. At the base end of the flare stack 141, a knockout drum 142 for separating liquid accompanying the gas to be burned in the flare stack 141 is provided. In this way, the berthing position of the living space 13 and the LNG tanker 6 is set at a position as far as possible from the flare stack 141 where the gas is burning at the upper end.

However, it is not an essential requirement to provide the flare stack 141 on the opposite side of the pipe rack portion 51 (the center position in the ship width direction) when viewed from the berthing position of the LNG tanker 6. FIG. 5 described later shows an example in which the flare stack 141 is arranged at the bow on the starboard side at the same position as the berthing position.

The FLNG 1 having the external turret 12 moores the hull 11 so that the turret 12 is always located on the windward side. Therefore, as described above, it is preferable that the cold end portion 3 and the flare stack 141 are arranged at a position as far away from the living portion 13 as possible.

Further, the FLNG 1 of the present example is characterized in that the arrangement position of the cold end module 30 is determined by focusing on the devices provided in the cold end unit 3.
That is, in the cold end section 3 of the present example, at least one of the distillation columns (the deethanizer 341, the depropanizer 342, and the debutanizer 343) for distilling the liquid hydrocarbon components of ethane, butane, and propane separated from NG. One or more) and the MCHE 321 for liquefying NG are installed in different cold end modules 30. Further, (i) the cold end module 30 including the MCHE 321 is disposed on the port side of the hull 11, which is on the opposite side of the pipe rack portion 51 (center position in the ship width direction) when viewed from the berthing position of the LNG tanker 6, (Ii) The cold end module 30 including the

distillation columns

341, 342, and 343 is disposed in the cold end unit 3 at a position closer to the turret 12.

As described above, in the cold end portion 3, there is a possibility that the amount of diffusion of the flammable substance at the time of occurrence of leakage increases. Therefore, the distillation column (at least one or more of the deethanizer 341, the depropanizer 342, and the debutanizer 343) and the MCHE 321, which particularly hold a large amount of the liquid combustible substance, and the MCHE 321 are arranged in different cold end modules 30. By limiting the location of the cold end module 30 to a specific location, the influence on other devices, the effect of explosion, and the spread of fire when leakage occurs are suppressed.

The enlarged plan view of FIG. 5 shows an example of equipment arrangement of the MCHE 321 and the distillation columns 341 342 343 in the arrangement of the cold end module 30 described with reference to FIGS. However, for convenience of showing the variation of the arrangement position of the flare stack 141 described above, unlike FIG. 2 and FIG. 4, FIG. 5 shows an example in which the flare stack 141 is arranged at the bow on the starboard side.
For example, of the two

cold end modules

30a and 30b arranged on the port side of the hull 11, the cold end module 30a arranged on the bow side is provided with a deethanizer 341, a depropanizer 342, and a debutanizer 343. That is, the cold end module 30a is provided at a position closest to the turret 12 in the cold end unit 3, and satisfies the requirement (ii).

As described above, the FLNG 1 having the external turret 12 moores the hull 11 so that the turret 12 is always located on the windward side. For this reason, the cold end module 30a provided closest to the turret 12 is always at a position where the wind blows directly without being interrupted by the other cold end modules 30b. For this reason, even if the flammable substance leaks in the cold end module 30a provided with the

distillation columns

341, 342, and 343, the flammable substance is evacuated to the outside by the wind blown from the turret 12 side. Can be.

In the cold end portion 3, the position closest to the turret 12 is also a position far from the berthing position of the LNG tanker 6 when viewed along the captain direction of the hull 11. Also from this viewpoint, the influence on the LNG tanker 6 when the flammable substance leaks in the cold end module 30a can be suppressed.

Next, the MCHE 321 is provided in the cold end module 30b arranged at a position adjacent to the stern side when viewed from the cold end module 30a, and satisfies the requirement (i). Further, an end flash drum 331 is provided alongside the cold end module 30b provided with the MCHE 321.
By arranging the MCHE 321 at a position away from the berthing position of the LNG tanker 6, it is possible to suppress the influence on the LNG tanker 6 when the flammable substance leaks in the cold end module 30b.

In addition, the safety zone 53 provided between the cold-end module 30b and the hot-end module 20 is provided, for example, with respect to the length (L) of the cold-end module 30b in the ship length direction. For example, a case where the distance from the lens 20 is set to be "L / 5 or more and 2L or less", preferably "L / 5 or more and L or less" can be exemplified.

デ Also, a demethanizer 311 is arranged on the cold end module 30c arranged on the starboard side of the hull 11. When the retained amount of the liquid combustible substance in the demethanizer 311 is less than the retained amount of the liquid combustible substance in the deethanizer 341, the depropanizer 342, the debutanizer 343, and the MCHE 321 as the composition of the natural gas. There is. In this case, the effect of the occurrence of the leakage of the combustible material from the MCHE 321 is compared with the effect of too many restrictions when determining the location of the cold end module 30, and the cold end module in which the demethanizer 311 is disposed is compared. 30 does not need to be provided with the restrictions (i) and (ii) described above.

蒸留 In addition, in the distillation column provided in the NG liquefaction apparatus, in addition to the function of the demethanizer 311, the functions of the deethanizer 341, depropanizer 342, and debutanizer 343 may be realized by a common distillation column. Regarding the arrangement of the cold end module 30 including such a distillation column, the restriction (ii) is applied.

Next, with reference to FIGS. 6 to 8, variations in the arrangement of the plurality of cold end modules 30 provided with the

distillation columns

341, 342, 343 and the MCHE 321 will be described.
In each of the arrangement examples shown in FIGS. 6 to 8, the number and location of the cold-end modules 30 and the area of each cold-end module 30 when viewed in plan are the same as those shown in FIGS. You may not.

In the example shown in FIG. 6, the cold end module 30c including the

distillation columns

341, 342, and 343 is arranged on the starboard side of the hull 11. Since the cold end module 30c is also provided at the position closest to the turret 12 in the cold end section 3, the requirement (ii) is satisfied.
The cold end module 30a provided with the MCHE 321 is further provided with a demethanizer 311. Since the cold end module 30a including the MCHE 321 is disposed on the port side of the hull 11 opposite to the pipe rack portion 51 when viewed from the berthing position of the LNG tanker 6, the requirement (i) is satisfied. .

Next, the example shown in FIG. 7 satisfies the requirement (i) because the cold end module 30 a provided with the MCHE 321 is disposed on the port side of the hull 11. The cold end module 30a is also provided with a demethanizer 311.
On the other hand, the cold end module 30 c provided with the distillation towers 341, 342, and 343 is provided on the starboard side of the hull 11 and at the position closest to the turret 12 in the cold end portion 3. Therefore, the cold end module 30c also satisfies the requirement (ii).

FIG. 8 shows an example in which two of the deethanizer 341, the depropanizer 342, and the debutanizer 343 and the remaining one are installed in modules 30 different from each other. In this example, a depropanizer 342 and a debutanizer 343 are provided in a common cold end module 30b, and a deethanizer 341 is provided in a common cold end module 30c with the demethanizer 311.

Since the cold end module 30a provided with the MCHE 321 is disposed on the port side of the hull 11, the requirement (i) is satisfied. Further, a safety region 53 is disposed between the cold end module 30a provided with the MCHE 321 and the cold end module 30b provided with the two

distillation columns

342 and 343. For this reason, even if the flammable substance leaks in the cold end module 30b, the flammable substance is prevented from entering the gap between the equipment groups and spreading at high speed, and the outside of the flammable substance is blown into the safety area by the wind. Exhaust can be promoted.

The cold end module 30c provided with one distillation tower 341 is provided on the starboard side of the hull 11 and in the cold end portion 3 closest to the turret 12. Therefore, the FLNG 1 also includes the cold end module 30c that satisfies the requirement (ii).

It is not an essential requirement that the MCHE 321 and the end flash drum 331 be provided in the common cold end module 30. The example shown in FIG. 8 shows an example in which the end flash drum 331 is provided in a cold end module 30c different from the cold end module 30a provided with the MCHE 321.

According to the FLNG 1 according to the embodiment described with reference to FIGS. 1 to 8, the following effects are obtained. Of the processing equipment in the cold end unit 3 that handles hydrocarbon liquids, which are large-scale sources of flammable substance leakage, pay attention to the deethanizer 341, the depropanizer 342, the debutanizer 343, and the MCHE 321 that contain a large amount of the liquid. These are arranged in different modules 30. Further, the cold end module 30 including the MCHE 321 is disposed on the opposite side of the pipe rack portion 51 (the center position in the ship width direction) when viewed from the berthing position of the LNG tanker 6. Further, the cold end module 30 including the

distillation columns

341, 342, and 343 is arranged at a position closest to the turret 12 in the cold end unit 3. By adopting these arrangements, leakage of combustible substances in

distillation columns

341, 342, 343 and MCHE 321, which have a large amount of retained combustible substances, influence on other devices when an explosion or fire occurs, The effect of explosion and the spread of fire can be suppressed.

Next, an example of the FLNG 1a including the hot end module 20 'and the cold end module 30' in which pipe racks are integrated on a common frame will be described with reference to FIGS. 9 to 11. FIG. 10 is a side view of the cold end modules 30 'and 30 as viewed from the position of C-C' in FIG.

As shown on the right side of FIG. 10, the conventional cold end module 30 has a structure in which a frame 301 accommodates various static devices 302 and moving devices 303 and connection pipes for connecting the static devices 302 and moving devices 303 and the like. It has become. On the other hand, for example, the pipe rack 51 provided with a pipe through which a fluid exchanged with the hot end module 20 and another cold end module 30 is provided is a frame structure independent of each other.

On the other hand, the cold end module 30 ′ shown on the left side of FIG. 10 includes, in addition to the static device 302 and the moving device 303, a pipe group 511 conventionally provided in an independent pipe rack 51 in a common frame 301. It is configured to be accommodated. This configuration has an effect of facilitating the transportation and assembly of the cold end module 30 'built in an external factory or the like.
The hot end module 20 'on the hot end unit 2 side also has a configuration in which each device 302, moving device 303, and piping group 511 are housed in a common frame 301. However, since the structure is the same as that of the cold end module 30 'shown in FIG. 10, a side view is omitted.

FIG. 11 shows an example of the arrangement of the

distillation columns

341, 342, 343, and the MCHE 321 in the FLNG 1a in which the pipe rack integrated cold end module 30 'and the conventional cold end module 30 are arranged.
In the example of FIG. 11, of the two

cold end modules

30a and 30b arranged on the port side, the MCHE 321 is provided in the cold end module 30a located on the bow side. That is, the cold end module 30a satisfies the requirement (i).
The cold end module 30c on the starboard side is provided with a deethanizer 341, a depropanizer 342, and a debutanizer 343. Since the cold end module 30c is provided at a position closest to the turret 12 in the cold end unit 3, the cold end module 30c satisfies (ii) described above.

1,1a FLNG
11 Hull 12 Turret 13 Living part 2 Hot end part 20, 20 '
Hot end module 3

Cold end unit

30, 30 ', 30a to 30d
Cold end module 311 Demethanizer 321 MCHE
341 Deethanizer 342 Depropanizer 343 Debutanizer 51 Pipe rack unit 52 Utility unit 53 Safety area

Claims

A floating facility equipped with a natural gas liquefaction device,
A floating body disposed on the sea and having a planar shape longer in the ship length direction than in the ship width direction,
One end of the floating body when viewed along the vessel length direction, provided outside the body of the floating body, mooring the floating body, and connected to a riser for underwater transport of natural gas. Turret,
A living part provided on the other end side of the floating body part opposite to the one end side,
A berthing position that is provided along the length direction of the floating body portion and makes a liquefied natural gas carrier berthing,
A hot end section provided on the floating body section between the turret and the living section, the processing section including a processing device for processing natural gas received through the riser in a gaseous state; and a carbonization section obtained from the natural gas. A cold end unit including a processing device that handles liquid hydrogen, and a natural gas liquefaction device including:
The hot end portion is arranged at a position closer to the living portion in the captain direction, and the cold end portion is arranged at a position closer to the turret than the hot end portion,
The cold end unit is divided into a plurality of sets of modules in which a device group including a processing device for processing the hydrocarbon liquid is installed, and these modules are arranged side by side,
In the plurality of modules, a distillation column for distilling a liquid hydrocarbon component separated from the natural gas and a main cryogenic heat exchanger for liquefying the natural gas are installed in different modules. Being done,
The module including the main cryogenic heat exchanger is arranged in a region on the opposite side of the center position in the ship width direction as viewed from the berthing position,
A floating facility, wherein a module including the distillation column is disposed at a position near the turret in the cold end portion.
2. The floating body equipment according to claim 1, wherein the module including the distillation column is arranged in a region on the near side of a center position in a boat width direction when viewed from the berthing position. 3.
2. The floating facility according to claim 1, wherein a utility unit including a device group for supplying utilities is arranged between the living unit and the hot end unit. 3.
In a distillation column installed in a module different from the module in which the main cryogenic heat exchanger is installed, a deethanizer for distilling and separating ethane from a liquid hydrocarbon component having 2 or more carbon atoms, and propane from the liquid hydrocarbon component, The floating body equipment according to claim 1, further comprising one or more of a depropanizer for distilling and separating and a debutanizer for distilling and separating butane from the liquid hydrocarbon component.
The floating body equipment according to claim 4, further comprising three distillation columns that are the deethanizer, the depropanizer, and the debutanizer, wherein the plurality of distillation columns are installed in a common module.
The apparatus according to claim 1, further comprising three distillation columns, the deethanizer, the depropanizer, and the debutanizer, wherein two of the distillation columns and the remaining one are installed in different modules. 4. The floating facility according to 4.
The module in which the one distillation column is installed is provided with a demethanizer for distilling and separating the natural gas into methane gas and a liquid hydrocarbon component having 2 or more carbon atoms, wherein the demethanizer is installed. Floating equipment.