CN112689529A

CN112689529A - Treatment facility

Info

Publication number: CN112689529A
Application number: CN201980060112.7A
Authority: CN
Inventors: 宍戸一骏; 原信幸
Original assignee: Nikkei Global Co ltd
Current assignee: Nikkei Global Co ltd; JGC Corp
Priority date: 2019-02-05
Filing date: 2019-02-05
Publication date: 2021-04-20
Also published as: SG11202102494XA; WO2020161785A1; KR20210118804A

Abstract

The present invention provides a technique for reducing the influence of the outflow of a combustible-containing fluid by a simple method. A treatment facility (2) for treating a combustible-containing fluid, the facility being provided outdoors and comprising: a machine arrangement area 21 in which a machine group including a plurality of machines for processing the fluid is arranged; a gas discharge area 40 set up for discharging the combustible gas to the exterior of the treatment facility 2 when fluid is flowing out of the machine to produce the gas. An exhaust fan 41 for pushing the gas is provided in the gas discharge area 40.

Description

Treatment facility

Technical Field

The present invention relates to a technique that can reduce the influence of outflow of a combustible-containing fluid to the outside by a treatment facility that treats the fluid.

Background

In designing a processing facility for processing a combustible-containing fluid, such as a liquefied natural gas facility and an oil refinery facility, it is necessary to take safety measures into consideration to prevent ignition of the combustible in the event that the fluid flows outside.

As an example of the safety measures, measures such as providing an area where no machine is disposed (safety area) between machine disposition areas to suppress an explosion wave pressure rise, and improving the strength of the machine main body and the frame supporting the machine to make them more explosion-proof are taken.

In this case, it is difficult to construct a sufficiently large safety area due to a restriction on an installation site area of the treatment facility, and in order to compensate for such a deficiency, it is necessary to improve explosion-proof performance of the machine and the frame, thereby increasing construction costs of the treatment facility. In particular, since the floating unit provided with the treatment facility is also a structure, the site area restriction of the treatment facility such as a liquefied natural gas facility provided in the floating unit disposed on the sea is large.

For example, patent document 1 describes a technique of arranging a wall portion having an explosion-proof property, in which an explosive module (explosion source) provided on the upper surface of an offshore structure such as flng (Floating coupled Natural gas) or Floating Production Storage and Offloading (FPSO), is separated from an adjacent module.

The wall has a plurality of openings with fans formed on a surface thereof facing the source of the explosion. When the combustible gas leaks at the explosion source, the fan sucks the combustible gas, and discharges it to an outlet provided at the upper end of the wall portion through a discharge passage formed in the wall portion. The blast pressure is also guided through these openings to the discharge channel and discharged to the outlet.

However, a processing facility typically includes a plurality of machines for processing combustible-containing fluids. Even if these devices are collectively arranged as the wall described in patent document 1, if a large enough wall is not provided, safety cannot be fully secured, and the construction cost may be increased.

Documents of the prior art

Patent document

Korean laid-open patent publication No. 2017-0061261 to patent document 1

Disclosure of Invention

Problems to be solved by the invention

The present invention has been made in the light of the above, and provides a technique for reducing the influence of outflow of a combustible-containing fluid by a simple method.

Means for solving the problems

The present invention provides a processing facility which is installed outdoors and processes a fluid containing a combustible, the processing facility being characterized by comprising:

a machine configuration area in which a machine group including a plurality of machines for processing the fluid is configured;

a gas discharge area configured for discharging the gas to an exterior of the processing facility as fluid flows from the machine to produce the combustible gas;

and an exhaust fan disposed in the exhaust region for propelling the gas.

The treatment facility may be provided with the following features.

(a) A plurality of machine arrangement regions are adjacently arranged in the processing facility with a machine non-arrangement region where the machine is not arranged interposed therebetween, and the gas discharge region is provided on the machine non-arrangement region. In this case, the exhaust fan is provided in the machine non-installation area, and is configured to blow the gas upward from below and discharge the gas to a space above the machine non-installation area. The exhaust fan is provided at a side position facing the non-equipment-disposed region, and is configured to purge the gas in a direction facing the side position and discharge the gas toward an external space of the processing facility when the processing facility is viewed in plan.

(b) A module configured by arranging the machine group in a frame is provided in the machine arrangement area, and the gas discharge area is provided in the module.

(c) The processing facility is a liquefied natural gas facility or an FPSO provided in a floating unit disposed at sea, and the machine disposition area is provided in the floating unit. Alternatively, the processing facility may be any one of a liquefied natural gas facility, an oil refinery facility, and a chemical facility, and the machine installation area may be located above ground.

Effects of the invention

In the present invention, a gas discharge area is provided for discharging combustible gas carried by a combustible-containing fluid flowing out of a treatment facility, and an exhaust fan is provided at an upstream position of the gas flow so as to push the gas to the outside of the treatment facility. According to this structure, the gas flowing out of the treatment facility can be effectively discharged by this simple structure.

Drawings

Fig. 1 is a plan view of the FLNG according to the embodiment.

FIG. 2 is a schematic view of the FLNG viewed from the side.

Fig. 3 is an enlarged side view of a safety area provided with an exhaust fan.

Fig. 4 is an enlarged plan view of the security area.

Fig. 5 is a schematic view showing a case where gas is discharged by an exhaust fan.

Fig. 6 is a plan view of an example in which an exhaust fan is provided in an lng facility installed on the ground.

Fig. 7 is an explanatory diagram showing a simulation result according to the embodiment.

Fig. 8 is an explanatory diagram showing a simulation result according to the comparative example.

Fig. 9 is an explanatory diagram showing a change in volume of the combustible gas with time.

Fig. 10 is a distribution diagram showing changes in explosion wave pressure when a combustible gas is ignited.

Detailed Description

First, referring to fig. 1 to 5, an example of providing the exhaust fan 41 to the FLNG that produces Liquefied Natural Gas (LNG) from Natural Gas (NG) on the ocean outdoors will be described. First, fig. 1 shows a layout of a device configured in the FLNG1, and an overall configuration outline of the FLNG1 is explained with reference to fig. 1.

The FLNG1 includes a Hull (Hull)10, which is a floating unit disposed at sea, and a turret 12 as a mooring device provided at the bow. The turret 12 is connected to mooring lines that tie down the hull 10 and at the same time to risers (mooring lines and risers not shown) for transporting produced Natural Gas (NG) through the water. Next, the direction in which the turret 12 is provided will be described as the front of the hull 10.

For example, the LNG facility 2 and a flare stack (neither the LNG tank nor the flare stack is shown) for burning surplus gas generated in an LNG tank or the like formed in the body of the hull 10 are provided on the bow of the hull 10.

Further, when the hull 10 is viewed from above, a pipe frame 22 is provided in a central region in the hull width direction so as to extend along the longitudinal direction of the hull 10. The pipe rack 22 is a framework structure that supports a pipe string through which various fluids processed in the LNG facility 2 flow.

A plurality of modules 21 for constituting the LNG facility 2 as the processing facility in the present embodiment are provided in parallel in the front and rear on the left and right sides of the pipe frame 22. For example, the module 21 is a division unit for assembling a machine group constituting a processing unit or the like that performs various processes on NG in the common frame 211.

The processing units constituting the LNG facility 2 may exemplify the following units: a gas-liquid separation unit for separating liquid contained in the NG received from the riser; a pretreatment unit for removing acid gases (carbon dioxide, hydrogen sulfide, etc.), moisture, mercury; a distillation separation unit for performing distillation separation of the NG from which the impurities have been removed, thereby obtaining methane; a liquefaction unit for liquefying methane, and the like.

A plurality of machine groups such as static machines such as a column tank and a heat exchanger, dynamic machines such as a pump, and connection pipes for connecting the static machines and the dynamic machines and pipes on the pipe frame 22 side are disposed in each module 21. In this way, although the inside of the module 21 has a complicated structure in which a plurality of devices are arranged, for convenience of illustration, it is simply illustrated as a rectangle in fig. 1 to 2 and 4 to 8.

The area where the modules 21 on the hull 10 are arranged corresponds to the machine arrangement area in the present embodiment.

It is not an essential requirement that the module 21 be configured by arranging various machine groups in the frame 211. For example, these machine groups may be arranged on a plate-like base to constitute the module 21, or the machines constituting the LNG facility 2 may be arranged on the hull 10. In these cases, a machine configuration region is provided on each base unit and a divided region unit divided by a passage for passage of an occupant.

Further, utility equipment 31 for supplying utilities such as cooling water, steam, and electric power, a placement area 11 for keeping machines to be serviced at the time of servicing, a living area 13 for living of FLNG1 staff, and a helicopter field 14 for taking off and landing of helicopters are provided in this order from the front at a position further rearward than the area where the module 21 and the pipe frame 22 are provided.

In the FLNG1 having the above-described schematic configuration, a fluid containing Natural Gas (NG) and combustibles such as LNG, LPG such as C3 and C4, and the like is processed by the LNG facility 2.

Once the fluid exits the LNG facility 2, the combustibles may ignite, thereby causing an explosion. In view of this, the FLNG1 needs to be provided with various safety measures.

As one of the safety measures, when a plurality of modules 21 arranged side by side in the fore-and-aft direction of the hull 10 are observed, a region where the equipment constituting the LNG facility 2 is not arranged (equipment non-arrangement region) is provided between the adjacent modules 21.

This machine unconfigured area, referred to as a Safety gap 23, prevents the formation of a large flammable gas cloud across the module 21, or once ignited, may serve to prevent an explosion wave pressure increase from an explosion.

In the example shown in fig. 1, 2 modules 21 are arranged together along the length of the hull 10, and one safety zone 23 is provided between the arrangement zones of the 2

modules

21 and 21.

When the length of one module 21 as viewed in the longitudinal direction of the hull 10 is L, a safety region 23 is provided to ensure a pitch of L/2 to L, for example.

In addition, the arrangement layout of the secure areas 23 is not limited to the example of fig. 1, and for example, the modules 21 and the secure areas 23 may be alternately arranged one by one. Further, regarding the arrangement relationship between the modules 21 and the pipe frames 22, instead of the example shown in fig. 1, for example, the pipe frames 22 may be arranged along one side of the hull 10 so as to extend forward and backward in the hull longitudinal direction, and the modules 21 may be arranged in the remaining region.

Further, in this example, to further reduce the risk of explosion when the combustible-containing fluid flows out of the machine in module 21, an exhaust fan 41 is provided at FLNG1 to forcibly discharge the gas to the outside of FLNG1 (fig. 2).

Fig. 2 is a simplified schematic diagram of the FLNG1 described with reference to fig. 1, as viewed from the side. In fig. 2, the description of the turret 12, the utility device 31, the placement area 11, and the like is omitted, and a state in which the modules 21 and the safety areas 23 are arranged alternately one by one from the bow side to the stern side is shown.

As shown in fig. 2, in the FLNG1 of the present embodiment, the exhaust fan 41 is provided on the floor side of the safety area (equipment non-arrangement area) 23. As the exhaust fan 41, a known fan provided in an ach (air Cooled Heat exchanger) or the like may be used, but unlike the case of the ach, a pipe through which a cooling fluid flows is not disposed on an upper surface or a lower surface of the exhaust fan 41.

Fig. 3 and 4 are a side view and a plan view of the periphery of the region where the exhaust fan 11 is provided in an enlarged manner. As shown in fig. 3, in the FLNG1 of this example, the module 21 is positioned by the column shoe 102 relative to the deck, which is the upper surface of the hull 10. A pallet 101 forming the floor of the module 21 and the safety area 23 is provided at the same height as the vicinity of the upper end of this pedestal 102.

A recess 421 is formed in the pallet 102 located in the safety area 23. The concave portion 421 is an exhaust fan installation area 4, and can accommodate a plurality of exhaust fans 41 therein. In the recess 421 shown in fig. 4, 2 rows of exhaust fans including 5 exhaust fans 41 are arranged in parallel from the pipe frame 22 toward the side of the hull 10. Air inlets 423 are provided at both sides of the exhaust fan installation area 4 to suck air.

As shown in fig. 3, a grill 422 is disposed on the upper surfaces of the exhaust fan 41 housed in the recess 421 and the air inlets 423 located on both sides thereof.

The exhaust fan installation area 4 may be configured by penetrating the recess 421 to the hull 10 and disposing the exhaust fan 41 on the upper surface (hull deck) of the hull 10.

When the above-described exhaust fan 41 is operated, an air flow flowing into the safety area 23 via the grill 422 is formed, and the air flow flows from the lower side to the upper side in the space constituting the safety area 23 (fig. 2). When combustible gas flows into the containment region 23 as the combustible-containing fluid exits the module 21 adjacent the containment region 23, the gas is swept away with the flow of the gas stream created by the exhaust fan 41. From this point of view, the safety zone 23 constitutes a gas discharge zone 40 for discharging combustible gas.

Fig. 5 schematically shows the flow (i) of combustible gas pushed by the action of the exhaust fan 41. For example, consider the case when a combustible-containing fluid leaks from module 21, where module 21 is positioned in front of tube rack 22, facing toward fig. 5, and is disposed to the left of containment region 23. Since the air flow is established from bottom to top in containment region 23 (gas discharge region 40), when the combustible becomes gas (combustible gas) flowing into containment region 23, the gas flows downstream, discharging outwardly toward the space above FLNG 1.

For example, the exhaust fan 41 may be operated all the time during a period in which the fluid containing combustibles flows inside the LNG facility 2, such as during operation, during startup, or during shutdown. Because the air flow is constantly formed in the safety area 23, the inside of the safety area 23 is in a negative pressure state compared to the space inside the module 21. As a result, even if the fluid flows out of the module 21, the combustible gas can be sucked into the safety region 23 (the gas discharge region 40).

In addition, it is not a necessary condition that the exhaust fan 41 is always operated, and for example, a gas detector may be provided in the module 21, and when the gas detector detects combustible gas, the exhaust fan 41 may be operated.

Further, in fig. 5, a configuration example other than the case where the exhaust fan setting area 4 is set on the floor of the safety area 23 is also shown.

For example, the exhaust fan installation area 4a is a configuration in which the exhaust fan 41 is installed at a side position on the pipe frame 22 side toward the safety area 23. At this time, the combustible gas flowing into the containment region 23 forms a gas flow (ii) which is pushed laterally from the inside (gas discharge region 40) of the containment region 23 (gas discharge region 40) from the center side (pipe frame 22) of the hull 10 toward the outside (ship side), and is discharged toward the space outside the FLNG 1.

Further, the exhaust fan installation area 4b is a configuration in which the exhaust fan 41 is installed in the frame 211 of the module 21, for example, at the bottom of the module 21. At this time, the gap between the machines disposed in the module 21 becomes the gas discharge area 40, and the combustible gas forms the gas flow (iii) that pushes the inside of the module 21 (gas discharge area 40) from the bottom to the top and is discharged to the outside toward the space above the FLNG 1. When the exhaust fan disposition area 4b is disposed, the frame of the pipe frame 22 may be used to support the exhaust fan 41, for example.

Further, although not shown in fig. 5 in order to avoid complicating the drawing, an exhaust fan 41 may be provided at a side position toward the pipe frame 22 side of the module 21, forming a flow of combustible gas pushed laterally within the module 21 (gas discharge area 40) to be discharged to the outside space of the FLNG 1. At this time, the frame of the pipe frame 22 and the module 21 may be used to support the exhaust fan 41.

The FLNG1 according to the present embodiment has the following effects. A gas discharge area 40 (safety area 23) is provided, which can discharge combustible gas when the combustible-containing fluid flows out of the LNG facility 2 (module 21), and an exhaust fan 41 for pushing the gas to the outside of the LNG facility 2(FLNG1) is provided upstream of the gas flow. Thereby, the gas can be efficiently discharged from the processing facility 2 with a simple structure.

In particular, as shown in the simulation results described later, the region in which the combustible gas diffuses can be suppressed within a limited range by providing the exhaust fan 41 and performing forced exhaust. From this result, it is understood that the distance between the safety regions 23 can be reduced, and the safety regions 23 are provided for the purpose of preventing formation of a large-scale flammable gas cloud and also preventing an increase in explosion wave pressure due to ignition of the gas cloud.

Here, as described above, although the case where the pitch of about L/2 to L is set in the safety region 23 when the length of one module 21 is L is shown, this pitch can be further shortened by providing the exhaust fan 41. For example, the above-described pitch of L/2 to L may be reduced by 20% or more, and may be even reduced by about 50% in a desirable example, as compared with the case where the exhaust fan 41 is not provided. In this case, the captain of the hull 10 can be shortened compared to a conventional hull, thereby reducing the material and construction costs of the FLNG 1.

Further, in the present technology, an exhaust fan 41 is provided upstream of the airflow, and a structure of purging and discharging the combustible gas is adopted. For example, the case of adopting this structure is compared with the case of providing the exhaust fan 41 at the gas discharge position to suck and discharge the combustible gas.

In the suction discharge, since the motor of the exhaust fan 41 that is the ignition point is located in the gas discharge area, the arrangement of this motor also increases the possibility of ignition and explosion, and the provision of the exhaust fan 41 increases the degree of congestion in the gas discharge area, so that the influence of the pressure of the explosion wave increases. From this result, it is understood that the purge exhaust gas is safer than the suction exhaust gas. Further, for the purpose of exhaust, it is more effective to discharge the gas to the wide gas exhaust area 40 than to suck the air into the narrow space of the exhaust fan 41.

In the example of the gas discharge area 40 being the safety area 23, it is not necessary to provide a wall structure for supporting the exhaust fan 41 on the upper surface or the side of the safety area 23, which is the discharge area. From this result, it is understood that the combustible gas can be effectively discharged while suppressing an increase in the construction cost of the FLNG 1.

Further, in the example in which the inside of the module 21 is taken as the gas discharge area 40, since it is not necessary to provide the exhaust fan 41 on the upper surface of the frame 211 or the side of the ship board, it is not necessary to apply an additional pressure to the frame 211. From this result, it is understood that increase in the size of the struts and horizontal members constituting the frame 211 can be suppressed, and increase in the construction cost of the FLNG1 can also be suppressed.

Further, if the exhaust fan 41 is disposed on each of the above surfaces of the module 21, it may affect the disassembly of the machine in the module 21 at the time of maintenance, and it is difficult to transport it to the placement area 11. From this point of view, in the present example, FLNG1, on the surface of which exhaust fan 41 is not disposed, can effectively discharge combustible gas while maintaining maintainability of module 21.

Further, the processing facility provided in the hull 10 is not limited to the LNG facility 2 that produces LNG from NG. For example, the same exhaust fans 41 (exhaust

fan installation areas

4, 4a, 4b) as in the examples described with reference to fig. 1 to 5 may be installed in an FPSO having a processing facility installed in the hull 10 for gas-liquid separation of crude oil and natural gas produced at sea.

Next, a plan view shown in fig. 6 is an example in which the exhaust fan 41 (the exhaust

fan installation regions

4, 4c) is installed with respect to the module 21 constituting the LNG facility 5 installed outdoors.

In the LNG facility 5 shown in fig. 6, the LNG facility 5 is configured by arranging a plurality of modules 51 along the longitudinal direction of a pipe frame 52 having a plurality of ACHE521 provided on the upper surface thereof.

In this LNG facility 5, the exhaust fan installation area 4 may be disposed on the ground in the space between the adjacently disposed modules 51 (corresponding to the safety area 23 in the FLNG1), as in the case of the FLNG1 described with reference to fig. 1 to 5.

Further, since there is a margin in the installation space of the exhaust fan 41 when the LNG facility 5 is installed on the ground, as shown in fig. 6, the exhaust fan installation area 4c may be disposed at a position other than the adjacent module 21, and an air flow flowing from the bottom to the top may be formed in the area 4c, thereby discharging the combustible gas to the outside toward the upper space of the LNG facility 5.

Further, as in the case of the exhaust fan installation area 4a described using fig. 5, the exhaust fan 41 may be installed in the space between the adjacently disposed modules 51 and the side position of the pipe frame 52 facing the modules 51, so as to push the combustible gas laterally.

Further, with a view to processing larger scale combustible materials such as LNG and LPG distillation columns, the following structure may also be adopted: the exhaust fan 41 is disposed at a position adjacent to the device or at a position lateral to the device, and flushes out the combustible gas generated by the outflow from the device.

Further, the processing facility as the object of pushing the combustible gas by the exhaust fan 41 and exhausting is not limited to the example of the LNG facility 5 shown in fig. 6. The exhaust fan 41 of the present example may be provided on various oil refinery facilities for the treatment of crude oil and various fractions obtained from crude oil for distillation, desulfurization, decomposition, upgrading, and the like, and chemical facilities for the production of petrochemicals and intermediate chemicals, polymers, and the like, so as to perform the emission of combustible gas.

Examples

(simulation)

The difference in the diffusion state of the combustible gas depending on the presence or absence of the exhaust fan 41 installed on the floor of the safety area 23 (gas discharge area 40) was analyzed by the cfd (computational Fluid dynamics) model.

A. Simulation of conditions

(embodiment) as shown in fig. 7, a CFD model provided with an exhaust fan 41 was made on the floor of the safety area 23 to simulate the diffusion of propane gas when propane leaks from the module 21 at a rate of 12 kg/s. The flow velocity of the air flow generated by the exhaust fan 41 was set to 6.7 m/s. The CFD analysis software used was FLACS (US registered trademark) v10.5Dispersion model by GEXCON.

Comparative example a CFD model was produced in the same manner as in the example, except that the exhaust fan 41 was not provided, and the diffusion state of propane gas was simulated.

B. Simulation results

Fig. 7 and 8 show simulation results of examples and comparative examples. These simulation results show the propane concentration distribution at each position in the CFD model in the time point after a predetermined time has elapsed from the start of propane outflow. In practice, the graph is a color graph, with different colors representing the range of propane concentrations, but due to the limitations of the figure, shown here as a gray scale pattern.

From the results according to the embodiment shown in fig. 7, it was confirmed that, in the safety region 23 formed by the exhaust fan 41, the propane gas was rapidly blown away by the gas flow flowing from the bottom to the top and discharged toward the space above the FLNG 1.

On the other hand, as is apparent from the results of the comparative example shown in fig. 8, a large amount of propane gas passes through the safety region 23 and flows into the adjacent modules 21, thereby forming a large-scale flammable gas cloud between the modules 21.

Fig. 9 is a graph showing a volume time-varying graph of a gas existing region in an explosion limit region based on simulation results of examples and comparative examples. The horizontal axis of FIG. 9 shows the elapsed time [ s ] from the start of propane outflow]The vertical axis represents the volume [ m ] of gas (combustible gas) in the explosion limit region³]. In the same graph, examples are shown by solid lines, and comparative examples are shown by shorter broken lines.

In the embodiment, the gas volume in the explosion limit region was controlled to 130m, compared to 30 seconds after the outflow³In the comparative example, the volume was 2200m³Almost 17 times.

Fig. 10 is a graph of the blast wave pressure distribution when the gas was ignited at the outflow position 30 seconds after the start of outflow of propane. The horizontal axis represents the distance [ m ] from the explosive source, and the vertical axis represents the explosive wave pressure [ barg ]. In the same graph, examples are shown by solid lines, and comparative examples are shown by shorter broken lines.

According to the schematic diagram shown in fig. 10, in this embodiment, the radius of the region where the pressure of the explosion wave reaches 2barg is controlled to be about 5 m. On the other hand, in the comparative example, the radius of the region where the detonation wave pressure reached 2barg was increased to about 17 m.

Description of the symbols

1 FLNG

10 hull of ship

2 LNG facility

21 Module

211 frame

22 pipe frame

23 secure area

4. 4 a-4 c exhaust fan installation area

40 gas discharge area

41 exhaust fan

5 LNG facility

51 module

52 pipe frame

Claims

1. A treatment facility which is installed outdoors and treats a combustible-containing fluid, comprising:

and an exhaust fan disposed in the gas discharge area for pushing the gas.

2. The processing facility according to claim 1, wherein:

a plurality of machine arrangement regions are adjacently arranged in the processing facility with a machine non-arrangement region where the machine is not arranged interposed therebetween, and the gas discharge region is provided on the machine non-arrangement region.

3. The processing facility according to claim 2, wherein: the exhaust fan is provided in the machine non-installation area, and is configured to blow the gas upward from below and discharge the gas toward a space above the machine non-installation area.

4. The processing facility according to claim 2, wherein: the exhaust fan is provided at a side position facing the area where the device is not disposed, and is configured to purge the gas in a direction facing the side position and discharge the gas toward an external space of the processing facility when the processing facility is viewed in plan.

5. The processing facility according to claim 1, wherein:

a module configured by arranging the machine group in a frame is provided in the machine arrangement area, and the gas discharge area is provided in the module.

6. The processing facility according to claim 1, wherein: the processing facility is a liquefied natural gas Facility (FPSO) or a Storage and Offloading system (FPSO) installed in a Floating unit on the sea, and the machine installation area is installed in the Floating unit.

7. The processing facility according to claim 1, wherein: the processing facility is any one of a liquefied natural gas facility, an oil refining facility, and a chemical facility, and the machine arrangement area is provided on the ground.