CN112703150B

CN112703150B - Design method of natural gas liquefaction device and natural gas liquefaction device

Info

Publication number: CN112703150B
Application number: CN201880097534.7A
Authority: CN
Inventors: 都筑保夫; 角田和亮
Original assignee: Nikkei Global Co ltd
Current assignee: Nikkei Global Co ltd
Priority date: 2018-10-12
Filing date: 2018-10-12
Publication date: 2023-08-25
Anticipated expiration: 2038-10-12
Also published as: KR102461904B1; KR20210064196A; WO2020075294A1; SG11202102533PA; CN112703150A

Abstract

The invention provides a design method of a natural gas liquefaction device and a natural gas liquefaction device, which can efficiently carry out the transportation for maintaining the equipment forming the natural gas liquefaction device in the natural gas liquefaction device arranged on a floating part. In a natural gas liquefaction device provided on a floating unit, a floor on which the largest device is arranged is determined from among maintenance target devices which are arranged on more than 2 floors of a module (20) and are removed for transportation during maintenance. Further, a lifting path is set in the gaps between the modules so as to carry in and out the machine of the determined floor. The floor on which the largest maintenance target device is disposed is determined among the remaining floors on which the lifting path is not set, and the following steps are repeatedly performed for all floors on which the lifting path is required to be set: the elevator route of the floor is arranged in a manner of avoiding the elevator route of the arranged position.

Description

Design method of natural gas liquefaction device and natural gas liquefaction device

Technical Field

The present invention relates to a natural gas liquefaction plant for processing natural gas at sea, and more particularly, to a design method of a natural gas liquefaction plant and a natural gas liquefaction plant.

Background

For hydrocarbon gas produced from the well, i.e., natural gas, the following treatments are performed: pretreatment using various treatment apparatuses to remove various impurities from natural gas before liquefaction; and a liquefaction process that liquefies the pretreated natural gas to obtain LNG (Liquefied Natural Gas).

For example, as described in patent document 1, when a natural gas field is developed in the ocean or lake, a natural gas liquefaction device (ocean facility) is used, which is provided with equipment for performing pretreatment or liquefaction of natural gas on a floating portion floating on the sea. In such a natural gas liquefaction plant, there is a plant including a plurality of modules, each of which is provided with a device constituting each of the above-described facilities. Such a module is constituted, for example, by a frame divided into a multilayer structure.

On the other hand, in a natural gas liquefaction plant, after stopping the operation of the plant, a maintenance work may be performed after a machine to be maintained is detached and carried out of the module. In this case, a large maintenance target device needs to be carried out of or into the module by using a carrier device.

In this regard, in the natural gas liquefaction plant installed in the floating section, since the installation area of the plant is limited, it is difficult to install a plurality of large-sized transfer machines such as a pedestal crane or the like to cover the whole plant.

Therefore, when transporting maintenance target devices provided on each floor of the module, it is necessary to dispose a machine transporting beam, a pulley (trolley), or the like on each floor and transport the maintenance target devices individually through a predetermined transport path.

In designing such a modularized natural gas liquefaction plant, in addition to efficient machine arrangement based on the flow of fluid on the process side or the like, a transport path of the machine at the time of maintenance is required to perform module design, and thus there is a problem that design work for optimizing the machine arrangement becomes more complicated.

Prior art literature

Patent literature

Patent document 1 Korean laid-open patent publication No. 10-2016-0014918

Disclosure of Invention

Problems to be solved by the invention

The present invention has been made in view of the above circumstances, and provides a technique for efficiently arranging a lifting mechanism for carrying a maintenance target device constituting a natural gas liquefaction plant in a natural gas liquefaction plant provided in a floating portion.

Means for solving the problems

The invention provides a design method of a natural gas liquefaction device, which is a design method of a natural gas liquefaction device arranged on a floating part floating in water,

when the natural gas liquefaction device is provided with a plurality of modules for arranging the constituent devices of the natural gas liquefaction device in a frame of a multi-layer structure separately,

the method comprises the following steps: (a) A step of specifying, for one module among the plurality of modules, a floor on which the largest maintenance target device is placed, among maintenance target devices which are placed on more than 2 floors of the module, detached from the module during maintenance, and carried in/out from the outside of the module; (b) Setting a position of an elevating mechanism for carrying in and out the maintenance-target machine on the floor specified in the step (a) in the up-down direction through an elevating path on the side of the frame; (c) A step of determining, among the remaining floors where the arrangement position of the lifting mechanism is not set, a floor where the largest maintenance target device is arranged; and (d) setting the arrangement position of the lifting mechanism related to the maintenance target machine of the floor determined in the step (c) while avoiding the lifting path of the lifting mechanism using the set arrangement position; and repeating the steps (c) and (d) until the arrangement position is set for all floors on which the lifting mechanism is required to be arranged.

The method for designing the natural gas liquefaction plant may have the following features.

(1) In the step (b) or the step (d), the arrangement position of the lifting mechanism is set so that the transport distance between the arrangement position of the largest maintenance target device and the lifting mechanism is minimized.

(2) The floating unit includes a module row having a planar shape longer in the ship length direction than in the ship width direction, and the plurality of modules are arranged side by side in the ship length direction in a row; when the arrangement position of the elevating mechanism is set so that each elevating path is located in the gap between the adjacently arranged modules, the elevating path using the elevating mechanism whose arrangement position has been set is avoided for the module adjacent to the one module via the gap, except for the one module, and the arrangement position of the elevating mechanism in the step (d) is set.

(3) The width of the gap is set to be less than 2 times the width of the lifting path as viewed along the arrangement direction of the modules.

(4) In (2), the one module is divided into one side partition and the other side partition as seen in the arrangement direction, and when the lifting mechanism in which the lifting path is provided in the gap between the one side partition and the adjacent module and the lifting mechanism in which the lifting path is provided in the gap between the other side partition and the adjacent module are provided on a common floor, the steps (c) and (d) are repeatedly performed for each of the one side partition and the other side partition after the steps (a) to (d) are performed.

(5) In (2), a module in which the largest maintenance target machine is arranged is selected as the one module among the plurality of modules in the module row, and the step (c) and the step (d) are repeatedly performed for the one module after the steps (a) to (d) are performed.

(6) In (2), the steps (a) to (d) are executed in parallel for each module while sequentially selecting the one module in order of the size of the maintenance target device for a plurality of modules in the module row, and then the steps (c) and (d) are repeatedly executed.

(7) In (2), a pipe frame holding a frame structure of a piping group through which a fluid processed in the natural gas liquefaction device flows is provided at a center position in the ship width direction so as to extend in the ship length direction, and module rows are arranged on both sides of the pipe frame, respectively, as viewed from the bow side of the floating portion. In this case, a rest area for storing the maintenance target machine is provided at a position adjacent to the pipe rack, and the maintenance target machine is transported along the gap and the pipe rack between the lifting path and the rest area.

The invention provides a natural gas liquefaction device which is arranged on a floating part floating in water and having a plane shape with a longer ship length direction than a ship width direction,

the natural gas liquefaction device is provided with a plurality of modules which are arranged in a multi-layer structure frame in a separated manner, wherein the modules form a module row which is arranged in a row along the ship length direction;

the module row includes a module provided with a lifting mechanism which is arranged on more than 2 floors and is used for carrying in and out a maintenance object machine which is detached for carrying in and out with the outside of the module when the maintenance object machine is carried in and out through a lifting path at the side of the frame;

when the 2 modules having the lifting mechanisms are arranged adjacent to each other with a gap therebetween, the arrangement positions of the lifting mechanisms are set so that the lifting paths are located in the gap and so that the lifting paths do not overlap each other in a plan view.

Effects of the invention

The present invention restricts a conveyance path for vertically conveying a maintenance object machine by using a lifting mechanism to a side of a frame constituting a module, and determines a position where the lifting mechanism is disposed so that the conveyance paths do not overlap each other, so that the lifting mechanism can be disposed simply and efficiently.

Drawings

Fig. 1 is a plan view of a floating portion provided with a natural gas liquefaction device.

Fig. 2 is a side view of a floating part provided with the natural gas liquefaction device.

Fig. 3 is a plan view of a part of the floating portion enlarged.

Fig. 4 is a side view of the modules that make up the natural gas liquefaction train.

Fig. 5 is a plan view showing layer 1 of the module.

Fig. 6 is a plan view showing layer 2 of the module.

Fig. 7 is a plan view showing layer 3 of the module.

Fig. 8 is a plan view showing layer 4 of the module.

Fig. 9 is a plan view showing the configuration of HDZ between adjacent modules.

Fig. 10 is an explanatory view schematically showing a lifting mechanism provided on the HDZ.

Fig. 11 is a process diagram showing a method of setting the arrangement of HDZ.

Symbol description

2. Natural gas liquefying device

9. Floating part

20. Module

100 HDZ

200A-D1 st to 4 th layers

24. Conveying path

6. Pipe rack

93. Center transport path

Detailed Description

Fig. 1 and 2 are a plan view and a side view of a hull (floating portion) in a natural gas liquefaction device according to an embodiment. Fig. 3 is an enlarged plan view of a part of the natural gas liquefaction plant. As shown in fig. 1 and 2, the mooring facility 3 is provided on the bow side of the floating unit 9. 31 in fig. 1 is a tethered device support. The mooring apparatus 3 is moored for the floating part 9, for example by connection with mooring lines 34 arranged at the sea floor, and with risers 35 which transport the produced natural gas in the water. In the following description, the mooring equipment 3 side of the floating part 9 is set as the front.

Further, a flare stack portion 5 for burning surplus gas generated in the natural gas liquefaction device 2, an LNG tank in the floating portion, or the like is provided at a port side of the end portion of the floating portion 9 on the mooring facility 3 side.

The pipe holder 6 is provided at the center of the floating portion 9 so as to extend in the longitudinal direction of the floating portion 9. A plurality of modules 20 (module rows) constituting the natural gas liquefaction plant 2 for liquefying natural gas are provided side by side in the front-rear direction on the left and right sides of the pipe frame 6. Further, in the region between the groups of modules 20 arranged on the starboard side of the pipe frame 6 in the front of the floating unit 9 and in the region behind the pipe frame 6 and the groups of modules 20, a storage region 7 is provided for storing the equipment constituting the natural gas liquefaction plant 2, respectively, for being carried out of the ship. The space on the lower side of the pipe rack 6 serves as a center conveyance path 93 for conveying the machine carried out from each module 20 to the rest area 7.

Further, the living equipment 4 is provided on the rear side of the resting area 7 on the rear side of the floating portion 9. The layout of the tethered device 3 and the living device 4 is not limited to the positions shown in the embodiments. Further, the rest area 7 may be provided at any one of the front side and the rear side of the floating portion 9.

Fig. 4 is a side view of the module 20 located rearward of the column located on the starboard side, for example, when viewed from the front, as viewed from the center conveyance path 93 side. As shown in fig. 4, the frame 21 constituting the module 20 includes a plurality of floors, for example, 4 floors 200A to 200D. In this example, the layers 200B to 200D are referred to as layer 2 from layer 1 a provided at the height position of the deck, in order from the layer 1 to the layer 4. A gap 90 is provided between the modules 20 disposed adjacently in the front-rear direction of the natural gas liquefaction device 2. The gap 90 also serves as a conveyance path 24 for conveying maintenance-target equipment 10, which will be described later, on the deck that is lowered to the deck of the floating unit 9.

The respective floors 200A to 200D will be described with reference to fig. 5 to 8, which are plan views schematically showing the 1 st to 4 th floors 200A to 200D. In the 1 st to 4 th layers 200A to 200D having a substantially rectangular configuration, the modules 20 are arranged so that the sides shown on the upper sides in fig. 5 to 8 face the pipe racks 6. Each module 20 is provided with a plurality of heat exchangers 12, tanks 13 and 14, dynamic devices 11 such as pumps and compressors, and devices 10 such as piping, on-off valves and flow rate regulating valves for connecting the same. These machines 10 are provided on respective floors 200A to 200D. Alternatively, in the towers 13 and 14, it is sometimes arranged so as to span the multiple layers 200A to 200D.

Some of these machines 10 are disassembled for maintenance and carried outside of the module 20. When the equipment 10 to be maintained (maintenance-target equipment) is taken out, a tube bundle of the heat exchanger 12, the dynamic equipment 11, a valve (not shown) provided in a piping, and the like are taken out. For example, the tube bundle is one of the largest machines among the maintenance target machines 10, and the dynamic machine 11 and the valve provided in the large-diameter piping are often large-sized devices next to the tube bundle. These bundles or dynamic machines 11, and small machines 10 smaller than the large valves, are sometimes carried out of the module 20 appropriately during maintenance.

As shown in fig. 5 to 8, each of the floors 200A to 200D is provided with an evacuation path 22 for the operator along the peripheral edge. The machine 10 constituting the natural gas liquefaction device 2 cannot be installed in the evacuation path 22. Further, on the opposite side of the pipe rack 6 as viewed from the module 20, an evacuation stair 25 is provided to connect between the floors 200A to 200D. In the layer 1 200A, the center conveyance path 93 located on the lower side of the pipe rack 6 may also serve as a part of the evacuation path 22. Therefore, the evacuation path 22 of the 1 st floor 200A is provided at the periphery other than the center conveyance path 93 side.

For example, in the examples shown in fig. 5 and 6, 2 dynamic machines 11 as pumps for fluid transfer are provided on each of the 1 st layer 200A and the 2 nd layer 200B, and a sports 3 heat exchanger 12 is provided on the 3 rd layer 200C. Further, for example, a tower 13 such as a treatment tower is provided so as to penetrate through the 3 rd layer 200C to the 4 th layer 200D.

When the vertically elongated tower 13 is provided to stand from the floor when the tower 13 is provided to the floating portion 9, the swing width of the front end of the tower 13 increases when the floating portion 9 swings, and there is a risk that the tower will come into contact with the peripheral equipment 10 or the frame 21, topple over, or the like. Therefore, in this example, a skirt-like support member 15 having an opening diameter enlarged toward the lower side is provided with respect to the tower 13. In the tower 13, for example, from the side of the middle to the upper position to the entire circumference is held by the inner surface of the upper end portion of the support member 15. Further, by fixing the lower end of the support member 15 to the floor surface of the 4 th floor 200D, contact with the machine or tilting is suppressed. On the other hand, the tower 13 penetrates the bottom surfaces of the 4 th and 3 rd layers 200D and 200C, and the lower end thereof is arranged in a state of being lifted from the bottom surface of the 2 nd layer 200B. By fixing a portion close to the middle of the tower 13 from the side, even when the floating portion 9 swings, the swing amplitude of the upper and lower ends of the tower 13 becomes small, and thus safety is improved. Further, there is no need to provide a support member for erecting the tower 13 on the 2 nd layer 200B, and the lower side area of the tower 13 can be effectively utilized.

Further, each of the floors 200A to 200D is provided with a smaller tank 14 such as a receiving tank for receiving the liquid processed by the heat exchanger 12, the tower 13, and the like. In addition, for convenience, the configuration of machine 10 in the side view shown in fig. 4 is not necessarily identical to the configuration of machine 10 in the plan views shown in fig. 5 to 8. In these machines 10, for example, when the machine 10 is circular in cross section in a portion (bottom portion) fixed to the floating portion 9, for example, an annular ring member 16 supporting the bottom periphery of the machine 10 is disposed on each floor 200A to D, and the bottom surface of the machine 10 is placed and fixed on the ring member 16. In this way, by placing the machine 10 with a circular cross section of the bottom on the ring member 16, a stable setting can be made.

In the module 20 having the above-described structure, each machine 10 disposed in the module 20 may have to be moved outside the module 20 for maintenance. In such a maintenance target machine 10, the equipment disposed on the floors 200C to 200D of 2 or more floors is required to be lowered to the deck of the floating unit 9, and then transported to the placement area 7.

In the module 20 of the present embodiment, the maintenance target device 10 is transported in the vertical direction by the side of the module 20.

In the above-described view, in the side region of the frame 21 constituting each module 20, in this case, the gap 90 between the adjacent modules 20, the lifting path (HDZ: handling Drop Zone) 100 of the maintenance target device 10 is set. By this HDZ100, the maintenance target device 10 installed on the floors 200B to 200D of 2 or more floors is lowered to the deck, or the device 10 after maintenance is raised to each floor 200B to 200D. In this example, the width of the gap 90 between the modules 20 is set to be less than 2 times the width of the HDZ100. In fig. 5 to 8, the HDZ for transporting the maintenance target devices 10 disposed on the floors 200B to 200D described in the drawing is indicated by a solid line, and the HDZ100 for transporting the maintenance target devices 10 disposed on the other floors 200B to 200D is indicated by a broken line.

Further, on each floor 200B to 200D, a conveyance path 24 for conveying each maintenance target machine 10 in the lateral direction from the installation position to the HDZ100 is set. These conveyance paths 24 are guided from the installation position of each maintenance target device 10 to the peripheral edge side area facing the HDZ100 installed on the floors 200B to 200D. The area opposite the HDZ100 is, for example, the work area 26 in which the direction of the machine 10 is changed. Here, the work area 26 constitutes a part of the conveyance path 24. In addition, the transport path 24 from the installation position to the gap 90 between the modules or the transport path 24 to the center transport path 93 for transporting each maintenance object device 10 in the lateral direction is also set for the 1 st layer 200A.

Further, above the machine 10 located at the top of each floor 200B to 200D, a transportation beam 23 for lifting the machine 10 and guiding it into the transportation path 24 is provided. Further, a transportation beam 23 is provided so as to extend from above the work area 26 to the HDZ100 of the floors 200B to 200D.

As described above, the evacuation route 22 is set in the peripheral edge side area of each floor 200B to 200D, and the machine 10 cannot be set in the evacuation route 22. In this regard, as a temporary exception measure at the time of maintenance, the above-mentioned work area 26 is set and the beam frame for conveyance 23 is provided.

As shown in fig. 9, when one module 20 is viewed from above, the HDZ100 of each floor 200A to 200D is arranged so as to avoid overlapping with each other. Similarly, when the modules 20A to C are arranged in this order from the left side as viewed from the front in fig. 9, when the 2 modules 20A, 20B (20B, 20C) arranged adjacently with the gap 90 therebetween are viewed, the HDZs 100A to 100C of the respective modules 20A to C and the HDZs 100A to 100C of the adjacent modules 20A to C are arranged so as to avoid overlapping each other. Details of the method for setting the arrangement position of the HDZ100 will be described later.

Fig. 10 is a schematic diagram showing a configuration example of a lifting mechanism for carrying out the machine 10 in the up-down direction by the HDZ100. As shown in fig. 10, the maintenance target machine 10 is held in the work area 26 via a pulley 92 provided on the transportation beam 23. The pulley 92 is connected to the transportation beam 23 via a moving body 91, for example, and is configured to move along the transportation beam 23 and to be movable toward the HDZ100.

In the module 20 having the above-described configuration, when maintenance is performed, the maintenance target device 10, for example, the tube bundle of the heat exchanger 12, the impeller of the pump constituting the dynamic device 11, or the like is first detached and suspended from the transportation beam 23. Further, the maintenance target machine 10 is transported to the peripheral work area 26 via the transport paths 24 provided in each of 200A to 200D. Further, the maintenance target devices 10 installed on the floors 200B to 200D of 2 floors or more are suspended from the pulleys 92 of the transportation beam 23 protruding toward the HDZ100, and transported to the HDZ100.

Next, the maintenance target machine 10 is lowered to the deck along the HDZ100 by an operator on the deck side, and placed on a transport carriage (not shown). Further, the carrier is carried into the placement area 7 via the carrier path 24 and the center carrier path 93 on the side of the gap 90. In the machine 10 of the 1 st floor 200A, the machine is placed on a transport carriage on the transport path 24 provided on the floor 200A, and transported to the placement area 7 via the transport path 24 or the center transport path 93 on the side of the gap 90.

Thereafter, the maintenance target device 10 is transported from the rest area 7 to the land base station by, for example, an external ship or the like to perform maintenance. Then, the maintenance target device 10 after maintenance is returned to the rest area 7, transported to the original floors 200A to 200D through a path opposite to that at the time of carrying out, and mounted on the natural gas liquefaction device 2.

Next, a method of setting the arrangement position of the HDZ100 of each module 20 when designing the natural gas liquefaction train 2 will be described.

First, a case will be described in which the HDZ100 of a plurality of floors 200B to 200D is disposed in one module 20. Fig. 11 is a process diagram of a method of setting the arrangement positions of the HDZ100 on the plurality of floors 200B to 200D in the module 20.

As shown in fig. 11, first, among the floors 200B to 200D of 2 or more floors among the floors 200A to 200D, the floor on which the largest machine 10 is installed is specified, and the conveyance path 24 and the HDZ100 (P1, P2) are set.

In the example shown in fig. 5 to 8, for example, since the tube bundle of the heat exchanger 12 located in the 3 rd layer 200C is largest, the conveyance path 24 and the work area 26 of the heat exchanger 12 and the arrangement position of the HDZ100 are first set in the 3 rd layer 200C. In addition, the HDZ100 is set in the same manner for the other machines 10 in the 3 rd layer 200C.

At this time, in the 3 rd layer 200C where the arrangement position of the HDZ100 is initially set, it is preferable to set the arrangement position of the HDZ100 so that the transport distance between the arrangement position of the largest maintenance target machine 10 (the heat exchanger 12 in the above example) and the transport beam 23 provided with the pulley 92 as the lifting mechanism is the shortest, and to set the transport path 24 reaching the HDZ100.

In the example shown in fig. 7, since the other maintenance target devices 10 in the 3 rd floor 200C are, for example, relatively small-sized devices 10, the transportation path 24 using the transportation beam 23 is not set. For example, the maintenance target device 10 is transported to the work area 26 using a transport carriage. In this case, the HDZ100 may be set at a place such as a corner of the 3 rd floor 200C, where the arrangement position of the HDZ100 on the other floors 200B and 200D is not obstructed.

Next, the floor 200B on which the largest maintenance target device 10 is installed is selected from among the remaining floors 200B and 200D, and the conveyance path 24 and the arrangement position (P3 and P4) of the HDZ100 are set so as to avoid the set HDZ100. In this example, the component detached from the dynamic machine 11 of the layer 2 200B corresponds to this. Therefore, the arrangement position of the HDZ100 of the 2 nd layer 200B is set at a position that does not overlap with the HDZ100 of the 3 rd layer 200C, that is, at a position where the conveyance distance from the installation position of the dynamic device 11 is shortest. The step of determining the floor 200D on which the largest machine 10 is installed and the step of setting the conveyance path 24 and the HDZ100 so as to avoid the set HDZ100 (P3, P4) are also repeatedly performed for the remaining floors 200D. Here, since only the 4 th layer 200D remains, the HDZ100 of the 4 th layer 200D is set. In this example, since the maintenance target device 10 of the 4 th floor 200D is also a relatively small-sized device 10 or the like, the conveyance path 24 using the conveyance beam 23 is not set.

By the above steps, the HDZ100 arrangement positions of the floors 200A to 200D can be set so as to avoid overlapping when the module 20 is viewed from above.

According to the above embodiment, in the natural gas liquefaction device 2 provided in the floating unit 9, among the plurality of modules 20, one module 20 is identified as a floor 200C on which the largest machine 10 is arranged among the maintenance target machines 10 which are arranged on more than 2 floors 200B to 200D of the module 20 and detached and transported at the time of maintenance. Further, the HDZ100 is set for carrying in and out the machine 10 of the specified floor 200C in the gap 90 between the modules 20. Among the remaining floors 200B and 200D on which the HDZ100 is not set, the floor 200B on which the largest maintenance target device 10 is placed is specified, and the following steps are repeatedly performed for all the floors 200B to 200D on which the HDZ100 is required to be set: the HDZ100 of the floor 200B is disposed so as to avoid the HDZ100 of which the disposition position has been set. With such a configuration, the HDZ100 can be set in order from a certain floor of the large-sized machine 10, and the conveyance path 24 can be set, which can efficiently perform conveyance for maintaining the machine 10.

In particular, in the module 20 shown in fig. 5 to 8, when the HDZ100 of the 3 rd layer 200C is set, the place where the carrying distance from the heat exchanger 12 is shortest is set as the arrangement position of the HDZ100 of the 3 rd layer. In this way, by setting the arrangement positions of the HDZ100 in order from the floor 200C on which the large maintenance target device 10 is installed, the larger the maintenance target device 10 is, the shorter the conveyance distance is, and the arrangement of the HDZ100 can be effectively performed.

Further, an example of a method of setting the arrangement position of the HDZ100 so as to avoid overlapping between the plurality of modules 20 arranged in a row will be described.

As an example 1, the HDZ100 of each floor 200 is set according to the process diagram of fig. 11 for the module 20 having the largest maintenance target machine 10 among the plurality of modules 20. Thereafter, the modules 20 including the large machine 10 are sequentially selected from the remaining modules 20, and the HDZ100 can be set by the same method.

Further, as an example of the 2 nd, a floor 200 at which the HDZ100 is set may be selected from among the floors 200 of the plurality of modules 20, independently of the modules 20. For example, the devices 10 to be maintained may be selected from the floors 200 of all the modules 20 in order from the largest to the smallest, and the HDZ100 may be set sequentially from the floor 200 on which the devices 10 are installed.

Further, the HDZ100 is not limited to the example shown in fig. 6 to 8, and may be set at a peripheral edge (a side of the floating portion 9 shown in fig. 3) on the opposite side of the center conveyance path 93 of each floor 200.

As in the examples shown in fig. 6 and 7, in the module 20 having the floors 200B and 200C on which the HDZ100 is arranged with respect to the gaps 90 on both sides, the module 20 is divided into one side and the other side which can be observed along the arrangement direction of the plurality of modules 20, and the arrangement position of the HDZ100 can be set by using the method described in fig. 11.

Claims

1. A design method of a natural gas liquefaction device, which is arranged on a floating part floating in water, is characterized in that:

2. The method for designing a natural gas liquefaction plant according to claim 1, characterized in that: in the step (b) or the step (d), the arrangement position of the lifting mechanism is set so that the transport distance between the arrangement position of the largest maintenance target device and the lifting mechanism is minimized.

3. The method for designing a natural gas liquefaction plant according to claim 1, characterized in that:

the floating unit includes a module row having a planar shape longer in the ship length direction than in the ship width direction, and the plurality of modules are arranged side by side in the ship length direction in a row; when the arrangement position of the elevating mechanism is set so that each elevating path is located in the gap between the adjacently arranged modules, the elevating path using the elevating mechanism whose arrangement position has been set is avoided for the module adjacent to the one module via the gap, except for the one module, and the arrangement position of the elevating mechanism in the step (d) is set.

4. A method of designing a natural gas liquefaction plant according to claim 3, characterized in that: the width of the gap is set to be less than 2 times the width of the lifting path as viewed along the ship's length direction.

5. A method of designing a natural gas liquefaction plant according to claim 3, characterized in that: dividing the one module into a front side partition and a rear side partition as viewed along the ship length direction, and repeating the steps (c) and (d) after performing the steps (a) to (d) for each of the front side partition and the rear side partition when the lifting mechanism for setting the lifting path in the gap between the front side partition and the adjacent module and the lifting mechanism for setting the lifting path in the gap between the rear side partition and the adjacent module are set on a common floor.

6. A method of designing a natural gas liquefaction plant according to claim 3, characterized in that: the module in which the largest maintenance target machine is arranged is selected as the one module among the plurality of modules in the module row, and the step (c) and the step (d) are repeatedly performed for the one module after the steps (a) to (d) are performed.

7. A method of designing a natural gas liquefaction plant according to claim 3, characterized in that: and (c) repeating the steps (a) to (d) for each module while sequentially selecting the one module in the order of the size of the maintenance target device, with respect to the plurality of modules in the module row.

8. A method of designing a natural gas liquefaction plant according to claim 3, characterized in that: a pipe frame having a frame structure for holding a piping group through which a fluid processed in the natural gas liquefaction device flows is provided at a center position in the ship width direction so as to extend in the ship length direction, and module rows are arranged on both sides of the pipe frame, respectively, as viewed from the bow side of the floating portion.

9. The method for designing a natural gas liquefaction plant according to claim 8, characterized in that: a rest area for storing the maintenance target machine is provided at a position adjacent to the pipe rack, and the maintenance target machine is transported along the gap and the pipe rack between the lifting path and the rest area.

10. A natural gas liquefaction device provided on a floating portion floating in water and having a planar shape having a longer ship length direction than a ship width direction, characterized in that:

when 2 modules having the lifting mechanisms are arranged adjacently with a gap therebetween, the arrangement positions of the lifting mechanisms are set so that the lifting paths are located in the gap and so that the lifting paths are prevented from overlapping each other in a plan view,

the module row includes one module including a plurality of the lifting mechanisms, and when other modules are arranged on both sides of the module with a gap therebetween, the arrangement positions of the plurality of lifting mechanisms are set so that the lifting paths are located in the gaps on both sides and so that the lifting paths do not overlap each other in a plan view.

11. The natural gas liquefaction plant according to claim 10, characterized in that: the width of the gap is set to be less than 2 times the width of the lifting path as viewed along the arrangement direction of the modules.

12. The natural gas liquefaction plant according to claim 10 or 11, characterized in that: in the one module, the arrangement position of each lifting mechanism is set so that the larger the maintenance target machine transported by the lifting mechanism is, the shorter the transport distance from the installation position of the maintenance target machine to each floor of the lifting mechanism is.

13. The natural gas liquefaction plant according to claim 12, characterized in that: a pipe frame having a frame structure for holding a piping group through which a fluid processed in the natural gas liquefaction device flows is provided at a center position in the ship width direction so as to extend in the ship length direction, and the module rows are arranged on both sides of the pipe frame, respectively, as viewed from the bow side of the floating portion.

14. The natural gas liquefaction device according to claim 13, characterized in that it comprises: a storage area storing the maintenance target device at a position adjacent to the pipe rack; and a conveyance path that conveys the maintenance target machine along the gap and the pipe rack between the lifting path and the rest area.