WO2016001952A1

WO2016001952A1 - Air-cooled type liquefied gas production facility

Info

Publication number: WO2016001952A1
Application number: PCT/JP2014/003541
Authority: WO
Inventors: 久保田　圭; 謙角谷; 直之竹澤; 英史大森; 謙一郎門
Original assignee: 日揮株式会社
Priority date: 2014-07-02
Filing date: 2014-07-02
Publication date: 2016-01-07

Abstract

Provided is an air-cooled type liquefied gas production facility having an air-cooled type liquefied gas production section for producing a liquefied gas by liquefying a supply gas containing methane as the main component. In the air-cooled type liquefied gas production facility, the air-cooled type liquefied gas production section comprises: a heat exchanger for cooling the supply gas by subjecting the supply gas to heat exchange with a refrigerant; a compressor for compressing a refrigerant evaporated by the heat exchange with the supply gas; air-cooled heat exchangers for cooling the compressed refrigerant by subjecting the compressed refrigerant to heat exchange with air; an expansion section for cooling the cooled refrigerant by expanding the cooled refrigerant; and a pipe rack section having the air-cooled heat exchangers arranged at the vertically uppermost part thereof. The pipe rack section has arranged in the space thereof located vertically below the air-cooled heat exchanger: tubing for delivering the supply gas to the heat exchangers; tubing for delivering the compressed refrigerant to the expansion section; and tubing for delivering the expanded refrigerant to the heat exchanger. The vertical length of the space is greater than the transverse length of the space when viewed from above.

Description

Air-cooled liquefied gas production facility

The present invention relates to an air-cooled liquefied gas production facility and an air-cooled liquefied gas production method.

The liquefied gas production facility is a facility for purifying and liquefying natural gas LNG (Liquid Natural Gas), LPG (Liquid Petroleum Gas), and SNG (Synthetic Natural Gas) to produce the target liquefied gas. . Examples thereof include LNG manufacturing equipment, LPG manufacturing equipment, and SNG manufacturing equipment.

FIG. 1 is a functional block diagram showing an example of an LNG manufacturing facility. The gas supplied from the gas field is provided to the LNG manufacturing facility after the liquid separation step. In the LNG production facility, LNG is produced by obtaining processes such as mercury removal, acid gas removal, moisture removal, liquefaction, nitrogen removal and the like from the gas.

The refrigerant used in the liquefaction process is circulated and used in a vapor compression refrigeration cycle. In the refrigeration cycle, the refrigerant is compressed by a compressor in a gaseous state. The compressed refrigerant is cooled by a condenser and liquefied. The liquefied refrigerant having a high pressure is lowered in temperature by an expansion valve or the like. The low-temperature refrigerant is naturalized and becomes gas again by heat exchange with natural gas, which is a process fluid. In this way, natural gas is liquefied through a refrigeration cycle using compressor power and condenser heat exchange.

In the LNG production facility, a water-cooled or air-cooled condenser is used for the refrigeration cycle. Water-cooled condensers often use seawater to cool the cooling water, but the effect of seawater heated by heat exchange on the environment has become a problem. In recent years, LNG that uses air-cooled condensers has become a problem. Manufacturing facilities are increasing.
The liquefaction process is essential not only for LNG production equipment but also for LPG production equipment and SNG production equipment.

LNG manufacturing equipment is rectangular as a whole when viewed from above. A pipe rack is provided in the center of the facility along the longitudinal direction of the rectangle, and a refrigerant compressor, a heat exchanger for cooling natural gas, a distillation tower for purifying natural gas, etc. are arranged on both sides of the pipe rack. It is normal. In the air-cooled LNG manufacturing facility, a plurality of air-cooled heat exchangers (hereinafter also referred to as “ACHE”) are arranged on the top of the pipe rack portion in the vertical direction.

In the LNG manufacturing facility, when viewed from above, the plurality of air-cooled heat exchangers are arranged in a straight line of at least one row and have a rectangular shape as a whole. Since the LNG manufacturing facility has related facilities on both sides of the pipe rack with the air-cooled heat exchanger disposed at the top, the LNG manufacturing facility has a rectangular shape as a whole when viewed from above.

The air-cooled heat exchanger sucks up the air below the air-cooled heat exchanger by the rotation of the fan, passes it through the fan, and exhausts it upward. When air flows through the tube bundle of the air-cooling heat exchanger from the lower side to the upper side in the vertical direction, heat is exchanged between the air and the fluid in the tube bundle. Air is warmed by heat exchange with the warm fluid flowing through the tube bundle, and the temperature of the exhaust from the air-cooled heat exchanger is higher than that of the intake air.

In recent years, with the increase in size of LNG production facilities, one or two LNG production departments are often constructed at the initial stage of a project, and the number of LNG production departments is increased as demand increases. The LNG manufacturing department, which will be constructed as the project progresses, is modularized and has approximately the same format, and is called “LNG train”, “LNG module”, “LNG unit” or the like.

In an air-cooled LNG train, warm air (hot air) that should be discharged upward from the air-cooled heat exchanger flows into the intake side of the air-cooled heat exchanger, is sucked again as intake air, and is used as cooling air As a result, there is a problem that the amount of heat exchanged with the fluid flowing through the piping is reduced and the amount of LNG produced is reduced.

The problem that hot air discharged from the air-cooled heat exchanger is used as the suction gas of the air-cooled heat exchanger is called hot air recirculation (HAR).

In Non-Patent Document 1, in order not to increase the recirculation rate, the height position of the ACHE is aligned with the upper part of the structure, or the windward side is sealed and sucked from the leeward side, thereby causing a strong downward flow ( It is described that the downdraft is reduced.

FIG. 2 is a schematic vertical cross-sectional view showing the problem of hot air in the LNG manufacturing department that employs an air-cooled heat exchanger. The air-cooled heat exchanger of the LNG manufacturing unit sucks air from below by a fan, exchanges heat with the warm fluid flowing in the tube bundle, and exhausts the warmed air upward.

As shown in FIG. 2, the inventors of the present invention have a crosswise wind (cross wind) with respect to the longitudinal direction when viewed from above the LNG train. It has been found that this is a factor of the wind (downwash or downdraft) that blows down the exhaust of ACHE to the intake side. HAR is caused by the downwash wrapping around the intake of ACHE. HAR reduces the heat exchange amount of ACHE and makes it difficult to remove the heat of condensation for liquefying the gas, resulting in a decrease in LNG production.

Therefore, an object of the present invention is to provide an air-cooled liquefied gas production facility and an air-cooled liquefied gas production method capable of improving the efficiency of heat exchange by ACHE and suppressing a decrease in the amount of liquefied gas produced by HAR.

According to the present invention, the following air-cooled liquefied gas production facilities and the like can be provided.
1. An air-cooled liquefied gas production facility having an air-cooled liquefied gas production section that liquefies a supply gas mainly composed of methane to produce a liquefied gas,
The air-cooled liquefied gas production department
A heat exchanger for cooling the supply gas by heat exchange with a refrigerant;
A compressor that compresses the refrigerant evaporated by heat exchange with the supply gas;
A plurality of air-cooled heat exchangers for cooling the compressed refrigerant by heat exchange with air;
An inflating part for inflating and cooling the cooled refrigerant;
A plurality of air-cooled heat exchangers, and a pipe rack portion arranged at the top in the vertical direction,
In the pipe rack part, a pipe that sends the supply gas to the heat exchanger, a pipe that sends the compressed refrigerant to the expansion part, and a pipe that is expanded in a space below the air-cooled heat exchanger in the vertical direction. A pipe for sending the refrigerant to the heat exchanger is arranged,
A liquefied gas production facility, wherein the vertical length of the space is longer than the short length of the space when viewed from above.
2. In addition to the first space that secures a desired suction flow rate of the air-cooled heat exchanger, the space is a second space through which a counterflow against downwash is passed, in addition to the first space that secures the desired suction flow rate of the air-cooled heat exchanger. 2. The liquefied gas production facility according to 1, comprising a space.
3. The air-cooled liquefied gas production facility according to claim 1 or 2, wherein a pipe for sending refrigerant evaporated by heat exchange with the supply gas to the compressor is disposed outside the pipe rack portion.
4). The air-cooled liquefied gas production facility according to any one of 1 to 3, wherein the air-cooled heat exchanger includes a shielding plate member.
5. The compressor shelter that accommodates the compressor is disposed adjacent to the pipe rack portion, and the space of the pipe rack portion exists in a position higher than the compressor shelter in the vertical direction. Air-cooled liquefied gas production facility.
6). The air cooling according to any one of 1 to 5, wherein the compressor is disposed adjacent to the pipe rack portion, and is disposed so that an air intake of a gas turbine for driving the compressor does not face the pipe rack portion. Type liquefied gas production facility.
7). A plurality of the air-cooled liquefied gas production units, and the distance between any two adjacent air-cooled liquefied gas production units is the shortness of the space when the vertical length of the space is viewed from above. The air-cooled liquefied gas production facility according to any one of 1 to 6, wherein the facility is shorter than the distance in the case of being shorter than the length in the direction.
8). An air-cooled liquefied gas production method for producing a liquefied gas by removing unnecessary substances from a supply gas containing methane as a main component and liquefying,
An air-cooled liquefied gas production facility comprising a heat exchanger, a compressor, a plurality of air-cooled heat exchangers, an expansion part, and a pipe rack part in which the plurality of air-cooled heat exchangers are arranged at the top in the vertical direction Use
The air-cooled liquefied gas production facility is
In the pipe rack part, a pipe that sends the supply gas to the heat exchanger, a pipe that sends the compressed refrigerant to the expansion part, and a pipe that is expanded in a space below the air-cooled heat exchanger in the vertical direction. A pipe for sending the refrigerant to the heat exchanger is arranged,
The vertical length of the space is an air-cooled liquefied gas production facility that is longer than the length in the short direction of the space when viewed from above.
The heat exchanger cools the supply gas by exchanging heat with the refrigerant,
The compressor compresses the refrigerant evaporated by heat exchange with the supply gas,
The plurality of air-cooled heat exchangers cool the compressed refrigerant by heat exchange with air,
Expanding and cooling the cooled refrigerant by the expansion unit;
When a wind blows in the short direction of the pipe rack when viewed from above, a counter flow that blows up through the space is generated for a downwash that blows down from above the air-cooled heat exchanger. An air-cooled liquefied gas production method.

According to the present invention, it is possible to provide an air-cooled liquefied gas production facility and an air-cooled liquefied gas production method capable of improving the efficiency of heat exchange by ACHE and suppressing a decrease in the amount of liquefied gas produced by HAR.

FIG. 1 is a functional block diagram illustrating an example of an LNG manufacturing facility. FIG. 2 is a schematic longitudinal sectional view showing the problem of HAR in the air-cooled LNG manufacturing unit. FIG. 3 is a schematic longitudinal sectional view showing an embodiment of the air-cooled liquefied gas production section of the present invention. FIG. 4 is a process flow diagram showing a liquefaction process in the air-cooled liquefied gas production unit. FIG. 5 is an example of CFD analysis showing an air-cooled LNG manufacturing facility in which self-HAR occurs. FIG. 6 is an example of a CFD analysis of an air-cooled LNG manufacturing facility according to the present invention. FIG. 7 is a plan view of the air-cooled LNG manufacturing unit corresponding to the CFD analysis of FIG. 5 as viewed from above. FIG. 8 is a plan view of the air-cooled LNG manufacturing unit corresponding to the CFD analysis of FIG. 6 as viewed from above. FIG. 9 is a plan view seen from above showing an embodiment of the air-cooled liquefied gas production section of the present invention. FIG. 10 is a schematic longitudinal sectional view showing an aspect of the air-cooled liquefied gas production section of the present invention. FIG. 11 is a schematic longitudinal sectional view showing an embodiment of the air-cooled liquefied gas production section of the present invention. FIG. 12 is a plan view seen from above showing an embodiment of the air-cooled liquefied gas production section of the present invention. FIG. 13 is a schematic longitudinal sectional view showing a problem of HAR of an air-cooled LNG manufacturing facility. FIG. 14 is a plan view of the air-cooled LNG manufacturing facility related to the CFD analysis of FIG. 5 as viewed from above. FIG. 15 is a plan view of the air-cooled LNG manufacturing facility related to the CFD analysis of FIG. 6 as viewed from above.

Hereinafter, in the present invention, the air-cooled liquefied gas production facility and the air-cooled liquefied gas production section are assumed to be substantially rectangular when viewed from above. The substantially rectangular shape means a rectangle and does not necessarily have to be a complete rectangle. When viewed from above, the direction of the long side of the rectangle is called the longitudinal direction, and the direction of the short side is called the short direction. Various devices and pipes are arranged in a substantially rectangular area.

One aspect of the air-cooled liquefied gas production facility of the present invention is:
An air-cooled liquefied gas production facility having an air-cooled liquefied gas production section that liquefies a supply gas mainly composed of methane to produce a liquefied gas,
The air-cooled liquefied gas production department
A heat exchanger for cooling the supply gas by heat exchange with a refrigerant;
A compressor that compresses the refrigerant evaporated by heat exchange with the supply gas;
A plurality of air-cooled heat exchangers for cooling the compressed refrigerant by heat exchange with air;
An inflating part for inflating and cooling the cooled refrigerant;
A plurality of air-cooled heat exchangers, and a pipe rack portion arranged at the top in the vertical direction,
In the pipe rack part, a pipe that sends the supply gas to the heat exchanger, a pipe that sends the compressed refrigerant to the expansion part, and a pipe that is expanded in a space below the air-cooled heat exchanger in the vertical direction. A pipe for sending the refrigerant to the heat exchanger is arranged,
The vertical length of the space is longer than the length of the space in the short direction when viewed from above.

FIG. 3 is a schematic longitudinal sectional view showing an embodiment of the air-cooled liquefied gas production section of the present invention. About the air-cooled liquefied gas production department, the longitudinal section parallel to the transversal direction when seen from the sky is shown.

In the air-cooled liquefied gas production section of the present invention, as shown in FIG. 3, an air-cooled heat exchanger 2 is installed at the top of the pipe rack section 1. The air-cooled heat exchanger 2 includes a tube bundle 5 constituting a heat transfer surface for heat exchange, a fan, a motor for driving the fan, and the like. A certain space is opened below the air-cooling heat exchanger 2, and a pipe bundle 4 including a plurality of pipes is installed. The pipe bundle arranged in the pipe rack part is a specific pipe, that is, a pipe that sends the supply gas to the heat exchanger, a pipe that sends the compressed refrigerant to the expansion part, and a pipe that sends the expanded refrigerant to the heat exchanger. including.

FIG. 4 is a process flow diagram showing a liquefaction process in the air-cooled liquefied gas production unit. An example of a liquefaction process is shown roughly.
In the air-cooled liquefied gas production unit, the supply gas mainly composed of methane is sent to the heat exchanger 2 via the pipe 1 that sends the supply gas to the heat exchanger. The pipe 1 for sending the supply gas to the heat exchanger is disposed in the pipe rack portion, and the supply gas flowing through the pipe is air-cooled by the air-cooling heat exchanger.

In the heat exchanger 2, heat exchange between the supply gas and the refrigerant is performed. The supply gas is cooled and liquefied by heat exchange with the refrigerant to produce a liquefied gas. The produced liquefied gas is stored in the tank 3.
Although only one heat exchanger is shown in FIG. 4, the number of heat exchangers and the number of refrigerants used are not limited and can be appropriately determined depending on the process.

The refrigerant evaporated by heat exchange with the supply gas is sent to the compressor 11 via the pipe 10 that sends the refrigerant from the heat exchanger to the compressor, and is compressed by the compressor 11. The compressed refrigerant is sent to the expansion unit 13 via a pipe 12 that sends the compressed refrigerant from the compressor to the expansion unit. The pipe 12 for sending the compressed refrigerant to the expansion section is arranged in the pipe rack section, and the refrigerant flowing through the pipe is air-cooled by the air-cooling heat exchanger.

In the expansion part 13, a refrigerant | coolant is expanded with an expansion valve etc., a pressure is lowered | hung and a refrigerant | coolant is made still lower temperature. The expanded refrigerant is sent to the heat exchanger 2 via a pipe 14 that sends the expanded refrigerant to the heat exchanger. A pipe 14 for sending the expanded refrigerant to the heat exchanger is disposed in the pipe rack portion, and the refrigerant flowing through the pipe is air-cooled by the air-cooling heat exchanger.
In the heat exchanger 2, heat exchange between the supply gas and the refrigerant is performed again.

In the air-cooled liquefied gas production section of the present invention, as shown in FIG. 3, the space 3 below the vertical direction of the air-cooled heat exchanger 2 has a vertical length (X) when viewed from above. The length in the short direction of the space (corresponding to the tube bundle length) (Y) is made longer. As a result, the first space (the vertical length “Y” in FIG. 3) z is secured in the upper part of the uppermost pipe of the pipes arranged in the pipe rack to ensure the desired suction flow rate of the air-cooled heat exchanger. In addition to the space having the dimension of the axis, a second space (a space having the vertical length “XY” as the dimension of the z-axis in FIG. 3) for allowing the counter flow to resist downwash is provided. The cross wind can pass through the gap formed by the first space and the second space. When the wind (cross wind) in the width direction (short direction) with respect to the longitudinal direction of the liquefied gas production department blows, the wind that passes through the space (Anti wind) is opposed to the downwash that may occur. It can be reduced and HAR can be suppressed or reduced.

How long the vertical length of the space is made longer than the short length of the space is not particularly limited, and can be appropriately designed and determined according to process conditions and construction costs.

FIG. 5 is an example of a CFD (Computational Fluid Dynamics) analysis showing an LNG manufacturing facility where HAR occurs. It is an elevational view showing the lateral side of the train in the two LNG manufacturing sections of train A and train B. Note that the train A or B has the LNG manufacturing equipment shown in FIG. 3 arranged in parallel, so the pressure loss of the wind flowing in the lower part of the air-cooled heat exchanger is larger than in the case of one train. The situation is likely to cause downwash. The train A and the train B are provided with predetermined piping without providing a space below the vertical direction of the air-cooled heat exchanger.
The color shading shows a temperature distribution of 34.0 ° C to 39.0 ° C.
When a cross wind ("East Wind" in the figure) with respect to the longitudinal direction of the train, that is, a wind parallel to the short direction, a downwash occurs, and self-HAR (referred to as "Self recirculation" in the figure). Has occurred.

FIG. 6 is an example of a CFD analysis of an air-cooled LNG manufacturing facility according to the present invention. FIG. 6 is an elevational view showing the lateral direction of the train in the two LNG manufacturing facilities of train A and train B, as in FIG. 5. The train A and the train B are provided with predetermined piping with a space below the vertical direction of the air-cooled heat exchanger.
The color shading shows a temperature distribution of 34.0 ° C to 39.0 ° C.
Downwash because the crosswind in the longitudinal direction of the train ("East Wind" in the figure), that is, when the wind parallel to the short direction blows, the crosswind passing through the space becomes the opposite flow to the wind that blows down. And the occurrence of self-HAR is avoided.

FIG. 7 is a plan view seen from above corresponding to the CFD analysis of FIG. The LNG manufacturing department has a rectangular shape with the longitudinal direction from the top to the bottom as viewed in the drawing. When a cross wind with respect to the longitudinal direction of the train, that is, a wind parallel to the short direction of the train blows from the right to the left of the page, downwash occurs and HAR occurs. The HAR increases the intake temperature of the ACHE, and thus the exhaust temperature of the ACHE also increases. Therefore, it can be seen that the temperature above the ACHE and the left side of the drawing where the exhaust of the ACHE flows due to the cross wind are high.

FIG. 8 is a plan view seen from above corresponding to the CFD analysis of FIG. The LNG manufacturing department has a rectangular shape with the longitudinal direction from the top to the bottom as viewed in the drawing.
When a crosswind with respect to the longitudinal direction of the train, that is, a wind parallel to the short direction of the train blows from the right to the left of the page, the crosswind passing through the space in the pipe rack portion becomes the countercurrent to the wind that blows down. Therefore, generation of downwash and self-HAR is avoided. Since no HAR occurs, the ACHE intake temperature does not increase as in the case of FIG. 5 and FIG. 7 described above, and therefore the ACHE exhaust temperature does not increase. It can be seen that the temperature on the left side of the drawing through which the exhaust gas flows is lower than in the case of FIG.

In another aspect of the air-cooled liquefied gas production section of the present invention, a pipe for sending the refrigerant evaporated by heat exchange with the supply gas to the compressor is arranged outside the pipe rack section.

Specifically, for example, in FIG. 4, a pipe 10 that sends the refrigerant evaporated by heat exchange with the supply gas to the compressor is disposed outside the pipe rack portion. In other words, the pipe 10 for sending the refrigerant evaporated by heat exchange with the supply gas to the compressor is not included in the pipe bundle 4 arranged in the pipe rack portion 1 of FIG.
The pipe that sends the refrigerant evaporated by heat exchange from the heat exchanger to the compressor has a large diameter, and this pipe is not placed in the pipe rack part, but is placed outside the pipe rack part. In the bundle of pipes, it is possible to reduce the degree of congestion and the degree of congestion (Contingency), and it is possible to secure a space through which the opposing wind passes against the downwash that can occur when a cross wind blows.
When a cross wind blows, the wind passes through the space and faces the down wash, so that the down wash can be reduced and the self-HAR can be suppressed or reduced.

FIG. 9 is a plan view seen from above showing an embodiment of the air-cooled liquefied gas production section of the present invention.
FIG. 9 shows, as an example, a part of an LNG manufacturing unit that uses propane (C3) and a mixed refrigerant (MR) composed of nitrogen, methane, ethane, and propane as a refrigerant for cooling and liquefying natural gas. Is shown. This process is also called C3-MR method.

In FIG. 9, a pipe 110 for sending refrigerant evaporated by heat exchange with supply gas to a compressor (C3 Comp + GT) 120 in a heat exchanger (C3 heat exchanger) 100 using propane as a refrigerant is a pipe rack unit 300. Placed outside.
Further, in FIG. 9, a pipe 210 that sends a refrigerant evaporated by heat exchange with a supply gas to a compressor (MR Comp + GT) 220 in a heat exchanger (MCHE heat exchanger) 200 using a mixed refrigerant as a refrigerant is a pipe. It is arranged outside the rack unit 300.

On the other hand, a pipe 130 that sends the refrigerant compressed by the compressor 120 to the expansion section, a pipe 140 that sends the expanded refrigerant to the heat exchanger 100, and a pipe 230 that sends the refrigerant compressed by the compressor 220 to the expansion section. The pipe 240 for sending the expanded refrigerant to the heat exchanger 200 is arranged in the pipe rack unit 300, and the air flowing through the pipe is cooled by the air cooling heat exchanger.

In another aspect of the air-cooled liquefied gas production unit of the present invention, the air-cooled heat exchanger includes a shielding plate member.
The shielding plate member (winglet) plays a role of shielding the exhaust of the air-cooled heat exchanger from flowing downward in the vertical direction, thereby suppressing or reducing self-HAR.

FIG. 10 is a schematic longitudinal sectional view showing an aspect of the air-cooled liquefied gas production section of the present invention. As shown in FIG. 10, the air-cooled liquefied gas production unit of the present invention has an air-cooled heat exchanger 2 installed at the top of the pipe rack unit 1, and a fixed space 3 below the vertical direction of the air-cooled heat exchanger. The pipe bundle 4 including a plurality of pipes is installed. In one aspect of the present invention, the air-cooled heat exchanger includes a shielding plate member 6. If a shielding board member plays the role which shields the exhaust_gas | exhaustion discharged | emitted above the air-cooling heat exchanger from flowing down in the perpendicular direction, a shape, a dimension, an installation place, etc. can be determined suitably. For example, as shown in FIG. 10, a plate extending in the horizontal direction can be installed as a shielding plate member at the base of the air-cooled heat exchanger 2 at the top of the pipe rack portion 1.

In another aspect, the air-cooled liquefied gas production unit of the present invention is configured such that a compressor shelter that accommodates a compressor is disposed adjacent to the pipe rack unit, and the space of the pipe rack unit is a compressor shelter in the vertical direction. Present at a higher position. As a result, when a cross wind blows, it is possible to secure a space through which the opposing wind passes against downwash that may occur when a cross wind blows, and to eliminate objects that may become an obstacle from the path of the opposing wind. it can.
Here, a compressor shelter means the building which accommodates a compressor, a gas turbine, and the apparatus accompanying these.

FIG. 11 is a schematic longitudinal sectional view showing an embodiment of the air-cooled liquefied gas production section of the present invention. As shown in FIG. 11, the air-cooled liquefied gas production unit of the present invention has a pipe rack unit 1 in which an air-cooled heat exchanger 2 is installed at the top, and a fixed space 3 below the air-cooled heat exchanger in the vertical direction. The pipe bundle 4 including a plurality of pipes is installed. The compressor shelter 7 is disposed adjacent to the pipe rack portion 1, and the space 3 is disposed at a position higher than the compressor shelter 7 in the vertical direction.

In another aspect, the air-cooled liquefied gas production unit of the present invention is configured such that the compressor is disposed adjacent to the pipe rack unit, and the air intake (air intake port) of the gas turbine for driving the compressor is directed to the pipe rack unit. It is arranged so that there is no. As a result, downwash that can occur when cross wind blows, that is, air warmed by heat exchange exhausted from the air-cooled heat exchanger (hot air) can be prevented from being introduced as intake air of the gas turbine. The reduction in compression efficiency can be suppressed or prevented.

FIG. 12 is a plan view seen from above showing an embodiment of the air-cooled liquefied gas production section of the present invention. As in FIG. 9, the C3-MR process is shown. As shown in FIG. 12, the air intakes of the

gas turbines

125 and 225 are parallel to the longitudinal direction of the air-cooled liquefied gas production section having a rectangular shape when viewed from above, as indicated by the arrows in FIG. It is facing away from the pipe rack. As a result, even if a downwash occurs when crosswind (wind in the short direction) blows, the air intake (air intake) is not oriented in the short direction, so a high temperature downwash is introduced into the intake of the gas turbine. As a result, the reduction in the compression efficiency of the refrigerant can be suppressed or prevented.

In another aspect, the air-cooled liquefied gas production facility of the present invention has a plurality of air-cooled liquefied gas production units, and the length of the space in the vertical direction is short in the space when viewed from above. The distance between any two adjacent air-cooled liquefied gas production units is made shorter than when the length is shorter than the length.

The problem between different trains is referred to as “external hot air recirculation (HAR)” because hot air from the external train is sucked in.
When there are a plurality of air-cooled liquefied gas production units (trains) in the air-cooled liquefied gas production facility, as shown in FIG. 13, one air-cooled liquefied gas production unit (LNG train B) that can be generated when a cross wind blows. Downwash from the air causes self-HAR in the air-cooled liquefied gas production department, and the external HAR sucked as the intake air of the air-cooled heat exchanger of the adjacent air-cooled liquefied gas production department (LNG train A) in the leeward Cause.

In the present invention, a space is provided between the air-cooling heat exchanger arranged in the pipe rack section and the pipe bundle to reduce or suppress self-HAR, thereby reducing the external HAR in the adjacent air-cooled liquefied gas production section. Or it can be suppressed.

FIG. 14 is an example of CFD analysis showing the LNG manufacturing facility in which the self HAR and the external HAR are generated as shown in FIG. 5, and is a plan view seen from above. No space is provided between the air-cooled heat exchanger disposed in the pipe rack portion and the pipe bundle.
The color shading shows a temperature distribution of 34.0 ° C to 39.0 ° C.
When a cross wind blows, it is not possible to secure a flow of air that opposes the possible downwash, so that the self-HAR is generated by the downwash, and the downwash has an effect as an external HAR to the adjacent LNG train.

FIG. 15 is an example of CFD analysis showing the air-cooled LNG manufacturing facility shown in FIG. 6, and is a plan view seen from above. A space is provided between the air-cooled heat exchanger disposed in the pipe rack portion and the pipe bundle.
The color shading shows a temperature distribution of 34.0 ° C to 39.0 ° C.
When a cross wind blows, it is possible to secure a flow of air that opposes the possible downwash, reducing or suppressing self-HAR and reducing or suppressing external HAR.

External HAR can be avoided by increasing the distance between adjacent trains. However, if the distance between trains is made longer, the plot of the entire plant becomes larger, leading to a cost increase. The self-HAR countermeasure according to the present invention can avoid the external HAR without increasing the distance between trains, and can reduce the entire plant plot.

Each aspect of the air-cooled liquefied gas production facility of the present invention described above may be arbitrarily combined with any aspect.

The air-cooled liquefied gas production method of the present invention is an air-cooled liquefied gas production method for producing a liquefied gas by removing unnecessary substances from a supply gas mainly composed of methane and liquefying it,
An air-cooled liquefied gas production facility comprising a heat exchanger, a compressor, a plurality of air-cooled heat exchangers, an expansion part, and a pipe rack part in which the plurality of air-cooled heat exchangers are arranged at the top in the vertical direction Use
The air-cooled liquefied gas production facility is
In the pipe rack part, a pipe that sends the supply gas to the heat exchanger, a pipe that sends the compressed refrigerant to the expansion part, and a pipe that is expanded in a space below the air-cooled heat exchanger in the vertical direction. A pipe for sending the refrigerant to the heat exchanger is arranged,
The vertical length of the space is an air-cooled liquefied gas production facility that is longer than the length in the short direction of the space when viewed from above.
The heat exchanger cools the supply gas by exchanging heat with the refrigerant,
The compressor compresses the refrigerant evaporated by heat exchange with the supply gas,
The plurality of air-cooled heat exchangers cool the compressed refrigerant by heat exchange with air,
Expanding and cooling the cooled refrigerant by the expansion unit;
When the wind blows in a short direction when the pipe rack part is viewed from above, a counterflow that blows up through the space is generated for the downwash that blows down from above the air-cooled heat exchanger. .

Although several embodiments and / or examples of the present invention have been described in detail above, those skilled in the art will appreciate that these exemplary embodiments and / or embodiments are substantially without departing from the novel teachings and advantages of the present invention. It is easy to make many changes to the embodiment. Accordingly, many of these modifications are within the scope of the present invention.
The entire contents of the documents described in this specification are incorporated herein by reference.

Claims

An air-cooled liquefied gas production facility having an air-cooled liquefied gas production section that liquefies a supply gas mainly composed of methane to produce a liquefied gas,
The air-cooled liquefied gas production department
A heat exchanger for cooling the supply gas by heat exchange with a refrigerant;
A compressor that compresses the refrigerant evaporated by heat exchange with the supply gas;
A plurality of air-cooled heat exchangers for cooling the compressed refrigerant by heat exchange with air;
An inflating part for inflating and cooling the cooled refrigerant;
A plurality of air-cooled heat exchangers, and a pipe rack portion arranged at the top in the vertical direction,
In the pipe rack part, a pipe that sends the supply gas to the heat exchanger, a pipe that sends the compressed refrigerant to the expansion part, and a pipe that is expanded in a space below the air-cooled heat exchanger in the vertical direction. A pipe for sending the refrigerant to the heat exchanger is arranged,
A liquefied gas production facility, wherein the vertical length of the space is longer than the short length of the space when viewed from above.
In addition to the first space that secures a desired suction flow rate of the air-cooled heat exchanger, the space is a second space through which a counterflow against downwash is passed, in addition to the first space that secures the desired suction flow rate of the air-cooled heat exchanger. The liquefied gas manufacturing facility according to claim 1, which is configured from a space.
The air-cooled liquefied gas production facility according to claim 1 or 2, wherein a pipe for sending refrigerant evaporated by heat exchange with the supply gas to the compressor is disposed outside the pipe rack portion.
The air-cooled liquefied gas production facility according to any one of claims 1 to 3, wherein the air-cooled heat exchanger includes a shielding plate member.
The compressor shelter for accommodating the compressor is disposed adjacent to the pipe rack portion, and the space of the pipe rack portion is present at a position higher than the compressor shelter in the vertical direction. The air-cooled liquefied gas production facility described in 1.
6. The compressor according to claim 1, wherein the compressor is disposed adjacent to the pipe rack portion, and an air intake of a gas turbine for driving the compressor is disposed not to face the pipe rack portion. Air-cooled liquefied gas production facility.
A plurality of the air-cooled liquefied gas production units, and the distance between any two adjacent air-cooled liquefied gas production units is the shortness of the space when the vertical length of the space is viewed from above. The air-cooled liquefied gas production facility according to any one of claims 1 to 6, wherein the facility is shorter than the distance in the case of being shorter than the length in the direction.
An air-cooled liquefied gas production method for producing a liquefied gas by removing unnecessary substances from a supply gas containing methane as a main component and liquefying,
An air-cooled liquefied gas production facility comprising a heat exchanger, a compressor, a plurality of air-cooled heat exchangers, an expansion part, and a pipe rack part in which the plurality of air-cooled heat exchangers are arranged at the top in the vertical direction Use
The air-cooled liquefied gas production facility is
In the pipe rack part, a pipe that sends the supply gas to the heat exchanger, a pipe that sends the compressed refrigerant to the expansion part, and a pipe that is expanded in a space below the air-cooled heat exchanger in the vertical direction. A pipe for sending the refrigerant to the heat exchanger is arranged,
The vertical length of the space is an air-cooled liquefied gas production facility that is longer than the length in the short direction of the space when viewed from above.
The heat exchanger cools the supply gas by exchanging heat with the refrigerant,
The compressor compresses the refrigerant evaporated by heat exchange with the supply gas,
The plurality of air-cooled heat exchangers cool the compressed refrigerant by heat exchange with air,
Expanding and cooling the cooled refrigerant by the expansion unit;
When a wind blows in the short direction of the pipe rack when viewed from above, a counter flow that blows up through the space is generated for a downwash that blows down from above the air-cooled heat exchanger. An air-cooled liquefied gas production method.