Centrifugal compressor assembly and liquefied natural gas system

Abstract

The embodiment of the invention discloses a centrifugal compressor assembly and a liquefied natural gas system, and the centrifugal compressor assembly comprises a driver, a compressor body, a coupler, a lubricating oil station, a shaft head pump and a public base. According to the technical scheme, the centrifugal compressor assembly is mainly applied to a liquefied natural gas system, the driving machine and the compressor body serve as main bodies of the centrifugal compressor assembly and are connected through the coupler, and in the technical scheme, the compressor body comprises an impeller. And the impeller is driven to rotate through gear acceleration, and the energy of the driving machine is converted into the pressure energy of the gas through the rotation of the impeller. Wherein the lubricating oil station and the shaft head pump are jointly responsible for supplying oil to the driver and the compressor body. The centrifugal compressor assembly further comprises a public base, and the driving machine, the compressor body, the coupler, the lubricating oil station and the air inlet and exhaust system are all integrally arranged on the public base.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of fluid machinery technology, and in particular to a centrifugal compressor assembly and a liquefied natural gas system. Background Art

[0002] Liquefied natural gas (LNG) is the world's safest, most suitable for long-distance transportation and directly usable clean energy. In the LNG liquefaction process from wellhead gas, the mixed refrigerant compressor is a key piece of equipment. Previously, screw compressors were the predominant choice. However, with the continuous increase in wellhead LNG production capacity, multiple screw compressors are often connected in parallel to meet high flow requirements. However, this approach has numerous drawbacks. First, it occupies a large area, making it difficult to deploy in limited space. Second, the complex piping connections increase the installation and maintenance workload. Furthermore, the need for multiple prime movers increases the number of units and subsequent maintenance costs. If a single compressor is used, it typically consists of multiple skids, including the compressor and driver skids, lubrication oil station, seal panel station, high-level oil tank, and low-voltage electrical control cabinet. This occupies a large space and requires extensive on-site construction, making it difficult to adapt to the limited geological conditions and short commissioning cycles of natural gas wellheads. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] To this end, a first aspect of the present invention provides a centrifugal compressor assembly.

[0005] A second aspect of the present invention provides a liquefied natural gas system.

[0006] In view of this, according to a first aspect of an embodiment of the present application, a centrifugal compressor assembly is proposed, comprising:

[0007] A driving machine, wherein the driving machine is an electric motor;

[0008] A compressor body, the compressor body including an impeller, the compressor body drives the impeller to rotate through a gear speed increaser, and the compressor body converts the energy of the driving machine into pressure energy of the gas by utilizing the rotation of the impeller;

[0009] a coupling, through which the driving machine and the compressor body are connected;

[0010] A lubricating oil station, which is used to supply oil to the driving machine and the compressor body;

[0011] a shaft head pump connected to the compressor body and used to extract lubricating oil from the lubricating oil station to lubricate the centrifugal compressor;

[0012] An intake and exhaust system connected to the compressor body for delivering the mixed refrigerant into the compressor body for compression and discharging it to an external pipeline. The intake and exhaust system has two intake sections and two exhaust sections.

[0013] The common base, the driving machine, the compressor body, the coupling, the lubricating oil station and the shaft head pump are all arranged on the common base and form a skid.

[0014] In a feasible embodiment, the intake and exhaust system includes:

[0015] An air inlet, one end of which is an air inlet end and the other end is connected to the compressor body, and the mixed refrigerant enters the compressor body from the air inlet end of the air inlet end to be compressed for a stage;

[0016] A first exhaust port, one end of which is an exhaust end and the other end is connected to the compressor body, and the mixed refrigerant after a stage of compression is discharged through the exhaust end of the first exhaust port to an external device for cooling;

[0017] A two-stage air inlet, one end of which is the air inlet end and the other end is connected to the compressor body. After the mixed refrigerant is cooled by an external device, it is sent into the compressor body through the two-stage air inlet and subjected to two-stage compression;

[0018] The second-stage exhaust port has one end as the exhaust end and the other end connected to the compressor body. The mixed refrigerant after the second-stage compression is discharged to the external device through the exhaust end of the first-stage exhaust port and is used to provide the cooling capacity required for the production of liquefied natural gas.

[0019] In a feasible embodiment, the compressor body is a multi-shaft gear-speed-increasing centrifugal compressor with two-stage four-stage compression.

[0020] In a feasible implementation, it further includes:

[0021] A dry gas sealing system control panel, which is used to control and monitor the sealing gas of the compressor shaft end seal;

[0022] The dry gas sealing system control panel is arranged on the common base.

[0023] In a feasible implementation, it further includes:

[0024] A low-voltage electric control box is electrically connected to the driving machine, the compressor body and the dry gas sealing system control panel, and is used to distribute and control power to the driving machine, the compressor body and the dry gas sealing system control panel.

[0025] In a feasible embodiment, the lubricating oil station includes an oil tank, the oil tank is embedded in the common base, and the compressor body and the driving machine are connected to the common base through the oil tank.

[0026] In a feasible embodiment, it further includes: a lubricating oil pipeline, the lubricating oil pipeline is connected to the lubricating oil station, the compressor body and the driving machine, and the lubricating oil pipeline is pickled and passivated.

[0027] In a feasible embodiment, it further includes: a sealing gas pipeline, the sealing gas pipeline is connected to the dry gas sealing system control panel and the compressor body, and the sealing gas pipeline is pickled and passivated.

[0028] In a feasible embodiment, the intake and exhaust system further includes: inlet guide vanes, which are arranged at the first stage air inlet and the second stage air inlet, and the inlet guide vanes are used to adjust the load of the compressor body.

[0029] According to a second aspect of an embodiment of the present application, a liquefied natural gas system is provided, comprising:

[0030] A centrifugal compressor assembly as described in any one of the above;

[0031] a cooling and separation device, wherein the intake and exhaust system of the compressor body assembly is connected to the cooling and separation device;

[0032] A throttling expansion refrigeration component, wherein the intake and exhaust system of the compressor body component is connected to the throttling expansion refrigeration component.

[0033] Compared with the prior art, the present invention has at least the following beneficial effects:

[0034] In this technical solution, the centrifugal compressor assembly forms a complete skid through a common base, which is highly adapted to the wellhead gas liquefied natural gas device, significantly improving the production capacity of a single liquefied natural gas device. Compared with the previous situation of using multiple screw machines in parallel, on the one hand, the number of equipment in the entire unit is greatly reduced, making the design and commissioning faster and more efficient; on the other hand, it also greatly reduces the maintenance cost of the entire unit equipment. Through the integrated design, the centrifugal compressor assembly does not need to be assembled at the construction site, but can be directly connected to the other devices of the liquefied natural gas system, eliminating the steps and time of on-site assembly. At the same time, the centrifugal compressor assembly can be debugged before leaving the factory, avoiding the inconvenience caused by debugging after on-site assembly.

[0035] In this technical solution, the high-position oil tank is replaced by the shaft head pump, thereby further improving the integration of the centrifugal compressor assembly and avoiding the steps of assembling the centrifugal compressor and the high-position oil tank at the construction site. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0037] Figure 1 This is a structural block diagram of a centrifugal compressor assembly according to an embodiment of the present application.

[0038] in, Figure 1 The corresponding relationship between the reference numerals and component names is as follows:

[0039] 110, driving machine; 120, compressor body; 130, coupling; 140, lubricating oil station; 150, spindle head pump; 160, intake and exhaust system; 170, common base; 180, dry gas seal system control panel; 190, low-voltage electrical control box;

[0040] 161. First stage air inlet; 162. First stage exhaust port; 163. Second stage air inlet; 164. Second stage exhaust port. DETAILED DESCRIPTION

[0041] In order to better understand the above technical solution, the technical solution of the embodiment of the present application is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiment of the present application and the specific features in the embodiment are detailed descriptions of the technical solution of the embodiment of the present application, rather than limitations on the technical solution of the present application. In the absence of conflict, the embodiment of the present application and the technical features in the embodiment can be combined with each other.

[0042] like Figure 1As shown, according to the first aspect of the embodiment of the present application, a centrifugal compressor assembly is proposed, comprising: a driving machine 110, wherein the driving machine 110 is an electric motor; a compressor body 120, wherein the compressor body 120 includes an impeller, wherein the compressor body 120 drives the impeller to rotate by a gear speed increaser, and the compressor body 120 converts the energy of the driving machine 110 into the pressure energy of the gas by the rotation of the impeller; a coupling 130, wherein the driving machine 110 and the compressor body 120 are connected by the coupling 130; and a lubricating oil station 140, wherein the lubricating oil station 140 is used to lubricate the driving machine 110 and the compressor body 120. Oil supply; a shaft head pump 150, which is connected to the compressor body 120 and is used to extract lubricating oil from the lubricating oil station 140 to lubricate the centrifugal compressor; an intake and exhaust system 160, which is connected to the compressor body 120 and is used to send the mixed refrigerant into the compressor body 120 for compression and discharge it to an external pipeline, and the intake and exhaust system 160 has two stages of intake and two stages of exhaust; a common base 170, the driving machine 110, the compressor body 120, the coupling 130, the lubricating oil station 140 and the shaft head pump 150 are all arranged on the common base 170, and form a skid.

[0043] The centrifugal compressor assembly provided in the embodiment of the present application includes a driving machine 110, a compressor body 120, a coupling 130, a lubricating oil station 140, a shaft head pump 150 and a common base 170. The centrifugal compressor assembly provided by this technical solution is mainly used in liquefied natural gas systems, wherein the driving machine 110 and the compressor body 120 are the main bodies of the centrifugal compressor assembly, and the driving machine 110 and the compressor body 120 are connected by a coupling 130. In this technical solution, the compressor body 120 includes an impeller, and the impeller is driven to rotate by a gear speed increaser, and the energy of the driving machine 110 is converted into the pressure energy of the gas by the rotation of the impeller. Among them, the lubricating oil station 140 and the shaft head pump 150 are jointly responsible for supplying oil to the driving machine 110 and the compressor body 120. Among them, the intake and exhaust system 160 is connected to the compressor body 120 and the external pipeline. Usually, the external pipeline is connected to other devices of the liquefied natural gas system. The centrifugal compressor assembly further includes a common base 170 , and the driving machine 110 , the compressor body 120 , the coupling 130 , the lubricating oil station 140 and the intake and exhaust system 160 are all integrated on the common base 170 .

[0044] In the present technical solution, the centrifugal compressor assembly forms a complete skid through a common base 170, which is highly adapted to the wellhead gas liquefied natural gas device, significantly improving the production capacity of a single liquefied natural gas device. Compared with the previous situation of using multiple screw machines in parallel, on the one hand, the number of equipment in the entire unit is greatly reduced, making the design and commissioning faster and more efficient; on the other hand, the maintenance cost of the entire unit equipment is greatly reduced. Through the integrated design, the centrifugal compressor assembly does not need to be assembled at the construction site, but can be directly connected to the remaining devices of the liquefied natural gas system, eliminating the steps and time of on-site assembly. At the same time, the centrifugal compressor assembly can be debugged before leaving the factory, avoiding the inconvenience caused by debugging after on-site assembly.

[0045] In this technical solution, the high-level oil tank is replaced by the shaft head pump 150, thereby further improving the integration of the centrifugal compressor assembly and avoiding the steps of assembling the centrifugal compressor and the high-level oil tank at the construction site.

[0046] like Figure 1 As shown, the intake and exhaust system 160 includes: a first-stage air inlet 161, one end of the first-stage air inlet 161 is the air inlet end, and the other end is connected to the compressor body 120, and the mixed refrigerant enters the compressor body 120 from the air inlet end of the first end of the air inlet for a first stage of compression; a first-stage exhaust port 162, one end of the first-stage exhaust port 162 is the exhaust end, and the other end is connected to the compressor body 120, and the mixed refrigerant after a first stage of compression is discharged to an external device through the exhaust end of the first-stage exhaust port 162 for cooling; a second-stage air inlet 1 63. One end of the second-stage air inlet 163 is the air inlet end, and the other end is connected to the compressor body 120. After the mixed refrigerant is cooled by an external device, it is sent into the compressor body 120 through the second-stage air inlet 163 and subjected to second-stage compression; the second-stage exhaust port 164, one end of the second-stage exhaust port 164 is the exhaust end, and the other end is connected to the compressor body 120. After the second-stage compression, the mixed refrigerant is discharged to the external device through the exhaust end of the first-stage exhaust port 162 and is used to provide the cooling capacity required for the production of liquefied natural gas.

[0047] In this technical solution, the intake and exhaust system 160 includes a first-stage air intake 161 , a first-stage exhaust 162 , a second-stage air intake 163 and a second-stage exhaust 164 .

[0048] Among them, a section of the air inlet 161 is connected to the external pipeline and the compressor body 120. The external pipeline is used to transport the mixed refrigerant to the centrifugal compressor assembly. The mixed refrigerant is transported to the section of the air inlet 161 through the external pipeline and then to the compressor body 120. The compressor body 120 performs a section of compression on the mixed refrigerant.

[0049] The first exhaust port 162 connects the compressor body 120 and an external device. After passing through the first stage of compression in the compressor body 120, the mixed refrigerant enters the external cooling device. In this embodiment, the external cooling device is a cooling and separation device for liquefied natural gas. After passing through the first stage of compression, the mixed refrigerant passes through the first exhaust port 162 and enters the cooling and separation device from the compressor body 120 for cooling.

[0050] Among them, the second-stage air inlet 163 connects the external cooling separation device and the compressor body 120. After the mixed refrigerant is cooled by the cooling separation device, it enters the compressor body 120 again through the second-stage air inlet 163, and the compressor body 120 performs two-stage compression on the mixed refrigerant.

[0051] Among them, the second-stage exhaust port 164 connects the external device and the compressor body 120. After the mixed refrigerant is compressed twice by the compressor body 120, it is discharged to the external device through the second-stage exhaust port 164 and put into use. In this embodiment, the mixed refrigerant is discharged to the throttling expansion refrigeration component of the liquefied natural gas system through the second-stage exhaust port 164, and liquefied natural gas is used for refrigeration, thereby realizing the application of the mixed refrigerant.

[0052] In the present technical solution, the centrifugal compressor assembly realizes that the mixed refrigerant is input into the compressor body 120 through the first-stage air inlet 161, the first-stage exhaust port 162, the second-stage air inlet 163 and the second-stage exhaust port 164 for one-stage compression, discharged to the cooling separation device for cooling, then input into the compressor body 120 for two-stage compression, and finally output to the user process for throttling expansion refrigeration to meet the cooling capacity required for the production of liquefied natural gas.

[0053] like Figure 1 As shown, the compressor body 120 is a multi-shaft gear-speed-increasing centrifugal compressor with two-stage four-stage compression.

[0054] In this technical solution, the compressor body 120 is a multi-shaft gear-speed-increasing centrifugal compressor with two-stage four-stage compression. Through the application of the compressor body 120, the production capacity of a single liquefied natural gas device can be further improved through this centrifugal compressor assembly, and the previous situation of using multiple screw machines in parallel can be replaced.

[0055] like Figure 1 As shown, the centrifugal compressor assembly further includes: a dry gas sealing system control panel 180 , which is used to control and monitor the sealing gas of the shaft end seal of the compressor body 120 ; the dry gas sealing system control panel 180 is disposed on the common base 170 .

[0056] In this technical solution, the centrifugal compressor assembly also includes a dry gas seal system control panel 180, which is used to control and monitor the seal gas at the shaft end of the compressor body 120. The panel 180 consists of a control panel body, a control panel seal ring, a control panel spring, and other components. The panel 180 primarily controls the opening and closing of the gas seal, thereby controlling the internal and external pressures at the shaft end of the compressor body 120.

[0057] The specific working principle of the dry gas sealing system control panel 180 is that when the internal pressure of the shaft end is higher than the external pressure, the control panel seal ring will be compressed to seal, and the gas sealing ring is in the closed state. When the internal pressure of the pump body is lower than the external pressure, the control panel spring will relax the control panel seal ring, and the gas sealing ring will be in the open state, thereby achieving the control of the shaft end sealing gas.

[0058] At the same time, the dry gas sealing system control panel 180 also includes a monitoring device. When the sealing gas leaks, the monitoring device issues an alarm, thereby realizing the monitoring of the shaft end sealing gas.

[0059] At the same time, the dry gas sealing system control panel 180 is also arranged on the common base 170 , forming an integrated skid with the common base 170 .

[0060] like Figure 1 As shown, the centrifugal compressor assembly also includes: a low-voltage electrical control box 190, which is electrically connected to the driving machine 110, the compressor body 120 and the dry gas sealing system control panel 180, and the low-voltage electrical control box 190 is used to distribute and control power to the driving machine 110, the compressor body 120 and the dry gas sealing system control panel 180.

[0061] In this technical solution, the centrifugal compressor assembly also includes a low-voltage electrical control box 190, which is electrically connected to the driver 110, the compressor body 120, and the dry gas seal system control panel 180. Low-voltage electrical control box 190 is used to distribute and control power to the driver 110, the compressor body 120, and the dry gas seal system. Low-voltage electrical control box 190 transmits high-voltage power to the aforementioned low-voltage electrical equipment, ensuring safe and rational distribution of power and improving energy utilization.

[0062] like Figure 1 As shown, the lubricating oil station 140 includes an oil tank, which is embedded in the common base 170 , and the compressor body 120 and the driving machine 110 are connected to the common base 170 through the oil tank.

[0063] In this technical solution, the lubricating oil station 140 has an oil tank, which is embedded in the common base 170 and serves as a new base. The compressor body 120 and the driving machine 110 are arranged on the oil tank and connected to the common base 170 through the oil tank.

[0064] In this technical solution, the oil tank is used as the base of the compressor body 120 and the driver 110, which effectively reduces the footprint of the centrifugal compressor assembly and makes the centrifugal compressor assembly easier to transport and install.

[0065] like Figure 1 As shown, the centrifugal compressor assembly further includes: a lubricating oil pipeline, which is connected to the lubricating oil station 140, the compressor body 120 and the driving machine 110, and the lubricating oil pipeline is pickled and passivated.

[0066] In this technical solution, the centrifugal compressor assembly also includes a lubricating oil pipeline, which connects the lubricating oil station 140, the compressor body 120, and the driver 110. It is understood that the shaft head pump 150 acts on the lubricating oil pipeline. In this technical solution, because the shaft head pump 150 replaces the high-level oil tank and the common base 170 forms an integrated skid, there is no need to assemble the high-level oil tank and the lubricating oil station 140 on site. The lubricating oil pipeline can be completely prefabricated and pickled and passivated before leaving the factory. This arrangement can improve the stability of the lubricating oil pipeline during use and avoid failures caused by the inability to prefabricate and pickle individual parts.

[0067] like Figure 1 As shown, it also includes: a sealing gas pipeline, which is connected to the dry gas sealing system control panel 180 and the compressor body 120, and the sealing gas pipeline is pickled and passivated.

[0068] In this technical solution, the centrifugal compressor assembly also includes a sealing air pipeline, which connects the dry gas sealing system control panel 180 and the compressor body 120. In this technical solution, the centrifugal compressor assembly forms an integrated skid, and the dry gas sealing system control panel 180 is installed on the common base 170, so that the sealing air pipeline can be completely prefabricated and pickled and passivated before leaving the factory, just like the above-mentioned lubricating oil pipeline.

[0069] like Figure 1 As shown, the intake and exhaust system 160 further includes inlet guide vanes, which are provided at the first stage air inlet 161 and the second stage air inlet 163 , and are used to adjust the load of the compressor body 120 .

[0070] In this technical solution, the intake and exhaust system 160 also includes inlet guide vanes, which are arranged at the first stage air inlet 161 and the second stage air inlet 163. The inlet guide vanes can adjust the load of the compressor body 120, guide the mixed refrigerant, and reduce the inlet speed to meet the requirements of the centrifugal compressor assembly.

[0071] like Figure 1 As shown, according to the second aspect of an embodiment of the present application, a liquefied natural gas system is proposed, comprising: a centrifugal compressor assembly as described in any one of the above; a cooling and separation device, wherein the intake and exhaust system 160 of the compressor body 120 assembly is connected to the cooling and separation device; and a throttling expansion refrigeration assembly, wherein the intake and exhaust system 160 of the compressor body 120 assembly is connected to the throttling expansion refrigeration assembly.

[0072] In the present invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "plurality" refers to two or more, unless expressly limited otherwise. Terms such as "installed," "connected," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; "connected" can mean a direct connection or an indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0073] In the description of the present invention, it should be understood that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front" and "back" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0074] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0075] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A centrifugal compressor assembly, characterized in that: include: A driving machine, wherein the driving machine is an electric motor; A compressor body, the compressor body including an impeller, the compressor body drives the impeller to rotate through a gear speed increaser, and the compressor body converts the energy of the driving machine into pressure energy of the gas by utilizing the rotation of the impeller; a coupling, through which the driving machine and the compressor body are connected; A lubricating oil station, which is used to supply oil to the driving machine and the compressor body; A shaft head pump, connected to the compressor body, for extracting lubricating oil from the lubricating oil station to lubricate the centrifugal compressor; An intake and exhaust system connected to the compressor body for delivering the mixed refrigerant into the compressor body for compression and discharging it to an external pipeline. The intake and exhaust system has two intake sections and two exhaust sections. The common base, the driving machine, the compressor body, the coupling, the lubricating oil station and the shaft head pump are all arranged on the common base and form a skid.

2. The centrifugal compressor assembly according to claim 1, wherein: The intake and exhaust system includes: An air inlet, one end of which is an air inlet end and the other end is connected to the compressor body, and the mixed refrigerant enters the compressor body from the air inlet end of the air inlet end to be compressed for a stage; A first exhaust port, one end of which is an exhaust end and the other end is connected to the compressor body, and the mixed refrigerant after a stage of compression is discharged through the exhaust end of the first exhaust port to an external device for cooling; A two-stage air inlet, one end of which is the air inlet end and the other end is connected to the compressor body. After the mixed refrigerant is cooled by an external device, it is sent into the compressor body through the two-stage air inlet and subjected to two-stage compression; The second-stage exhaust port has one end as the exhaust end and the other end connected to the compressor body. The mixed refrigerant after the second-stage compression is discharged to the external device through the exhaust end of the first-stage exhaust port and is used to provide the cooling capacity required for the production of liquefied natural gas.

3. The centrifugal compressor assembly according to claim 1, wherein: The compressor body is a multi-shaft gear-speed-increasing centrifugal compressor with two-stage four-stage compression.

4. The centrifugal compressor assembly according to claim 1, wherein: Also includes: A dry gas sealing system control panel, which is used to control and monitor the sealing gas of the compressor shaft end seal; The dry gas sealing system control panel is arranged on the common base.

5. The centrifugal compressor assembly according to claim 4, wherein: Also includes: A low-voltage electric control box is electrically connected to the driving machine, the compressor body and the dry gas sealing system control panel, and is used to distribute and control power to the driving machine, the compressor body and the dry gas sealing system control panel.

6. The centrifugal compressor assembly according to claim 1, wherein: The lubricating oil station includes an oil tank, which is embedded in the common base. The compressor body and the driving machine are connected to the common base through the oil tank.

7. The centrifugal compressor assembly according to claim 1, wherein: Also includes: A lubricating oil pipeline is connected to the lubricating oil station, the compressor body and the driving machine, and the lubricating oil pipeline is pickled and passivated.

8. The centrifugal compressor assembly according to claim 4, wherein: Also includes: A sealing gas pipeline is connected to the dry gas sealing system control panel and the compressor body, and the sealing gas pipeline is pickled and passivated.

9. The centrifugal compressor assembly according to claim 1, wherein: The intake and exhaust system further includes: Inlet guide vanes are provided at the first stage air inlet and the second stage air inlet, and are used to adjust the load of the compressor body.

10. A liquefied natural gas system, characterized in that: include A centrifugal compressor assembly according to any one of claims 1 to 9; a cooling and separation device, wherein the intake and exhaust system of the compressor body assembly is connected to the cooling and separation device; A throttling expansion refrigeration component, wherein the intake and exhaust system of the compressor body component is connected to the throttling expansion refrigeration component.

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