CN111853531A - Modular structure of LNG receiving station - Google Patents

Abstract

The invention provides a modular structure of an LNG receiving station, which comprises a loading and unloading ship module, a storage tank module, a high-pressure conveying module, a recondensor module, a BOG processing module, an SCV module, an ORV module, a torch module, a tank car loading and unloading module and a main pipe gallery module. The whole device can be built by a plurality of modules and prying blocks like a 'le Gao building block'; each module becomes the sled independently, is convenient for be under construction and installation, can demolish alone or change inside module simultaneously when the maintenance. The invention not only greatly shortens the installation and debugging time of field construction, reduces the construction and debugging personnel and saves the cost of field machines, but also can adapt to the development trend and direction of large-scale, comprehensive, integrated and intelligent LNG receiving station, improve the integration level of the device, reduce the equipment investment and save the occupied area of a factory.

Description

Modular structure of LNG receiving station

Technical Field

The invention relates to an LNG receiving station, in particular to a modularized LNG receiving station.

Background

A typical LNG receiving station includes: the system comprises a loading and unloading system, a storage system, an evaporation gas treatment system, a pressurization system, a gasification output system and a tank car loading system. In the traditional LNG receiving station engineering project, a receiving and unloading system, a storage system, a vaporized gas processing system, a pressurizing system, a gasification output system, a tank car loading system and the like are bulk material supplies, and are installed after being transported to the site.

These systems are complex, EPC general contractors supply bulk parts on site, construction materials such as equipment, cables, instruments, bridges, steel structures and the like are millions of parts, the heat preservation painting has high construction difficulty on site, and is limited by weather factors, the construction debugging period is long, the overall progress of projects is slow, the coordination of manufacturers is difficult, and the site service cost is high. The traditional technical scheme leads to large floor area of the device, long execution period, high investment cost and huge increase of construction risk, is difficult to adapt to the development trend and direction of large-scale, integrated and intelligent devices, and particularly has the following defects or shortcomings:

1. the construction amount is large, the installation period is long, and the field project progress is seriously influenced;

2. the construction work is influenced and restricted by the field environment;

3. the number of parts is large, and parts are easy to be lost and lost on site;

4. the coordination of manufacturers is difficult, and the service labor cost is high;

5. the installation is complex, and the requirements on installation instructors and site constructors are high;

6. the requirement on the construction precision of the civil foundation is high;

EPC general contractor coordination interfaces are numerous, and management is very complex;

8. the lack of stock for a single piece of equipment or material is a fatal hit to the overall project schedule;

9. The equipment investment is large, and the economic benefit is not good;

10. the occupied area of a factory is wasted, and the arrangement is tense;

11. the device cannot adapt to the development direction of large-scale and integration of the device, and the integration level of the device is poor.

Disclosure of Invention

The invention provides a modular structure of an LNG receiving station, which is characterized in that a receiving and unloading system, a storage system, a boil-off gas processing system, a pressurizing system, a gasification output system and a tank car loading system in the traditional LNG receiving station are optimized and integrated according to the concept of 'modules and block prying of three levels of devices, units and equipment', and the devices at the topmost layer and the equipment units at the bottommost layer are all modularized and block prying is realized, so that the whole device can be built by a plurality of modules and skid blocks like 'happy high building blocks'; each module is independently prized, so that construction and installation are facilitated, and meanwhile, the internal module can be independently removed or replaced during maintenance; the invention not only greatly shortens the installation and debugging time of field construction, reduces the construction and debugging personnel and saves the cost of field machines, but also can adapt to the development trend and direction of large-scale, comprehensive, integrated and intelligent LNG receiving station, improve the integration level of the device, reduce the equipment investment and save the occupied area of a factory.

In order to achieve the purpose, the invention adopts the technical scheme that:

an LNG receiving station modular structure which characterized in that: the system is provided with a loading and unloading ship module, a storage tank module, a high-pressure conveying module, a recondensor module, a BOG processing module, an SCV module, an ORV module, a flare module, a tank wagon loading and unloading module and a main pipe gallery module, wherein the loading and unloading ship module, the storage tank module, the high-pressure conveying module, the recondensor module, the BOG processing module, the SCV module, the ORV module, the flare module and the tank wagon loading and unloading module are respectively connected with the main pipe gallery module through a connecting pipe gallery module.

The LNG receiving station modular structure, wherein: the main pipe gallery module mainly comprises a nitrogen pipeline, an instrument wind pipeline, a factory air pipeline, a low-pressure pipeline, a high-pressure pipeline, a BOG pipeline and a drain pipeline.

The LNG receiving station modular structure, wherein: the connecting pipe gallery module mainly comprises a branch nitrogen pipeline, a branch instrument wind pipeline, a branch factory air pipeline, a branch low-pressure pipeline, a branch high-pressure pipeline, a branch BOG pipeline and a branch exhaust pipeline;

the branch nitrogen pipeline, the branch instrument wind pipeline, the branch factory air pipeline, the branch low-pressure pipeline, the branch high-pressure pipeline, the branch BOG pipeline and the branch exhaust pipeline are connected with the nitrogen pipeline, the instrument wind pipeline, the factory air pipeline, the low-pressure pipeline, the high-pressure pipeline, the BOG pipeline and the exhaust pipeline in a one-to-one correspondence mode.

The LNG receiving station modular structure, wherein: the loading and unloading ship module is used for unloading an LNG ship to a storage tank, the LNG ship is connected with a BOG return pipeline, an LNG cold insulation circulating pipeline and an LNG loading pipeline through a unloading arm, and the BOG return pipeline, the LNG cold insulation circulating pipeline and the LNG loading pipeline are respectively connected to a branch BOG pipeline, a branch low-pressure pipeline and a branch high-pressure pipeline of the connecting pipe gallery module;

the LNG cold insulation circulation pipeline and the LNG shipping pipeline are communicated to the nitrogen buffer tank through branch pipelines, the LNG cold insulation circulation pipeline and the LNG shipping pipeline are further communicated to the dock LNG emptying tank through pipelines, and the dock LNG emptying tank is further communicated to the BOG return pipeline through a pipeline.

The LNG receiving station modular structure, wherein: the storage tank module mainly comprises an LNG storage tank, a process pipeline, a valve, an in-tank pump and an on-tank operation platform;

the LNG storage tank is capable of storing liquid LNG discharged from an LNG ship; the in-tank pump is used for conveying the liquid LNG in the LNG storage tank to the high-pressure conveying module; the process pipeline and the valve are used for connecting the storage tank module with the loading and unloading ship module and the high-pressure conveying module through the connecting pipe rack module and the main pipe rack module.

The LNG receiving station modular structure, wherein: the high-pressure conveying module mainly comprises a high-pressure pump, a pump well, a flowmeter, a regulating valve and an inlet and outlet cut-off valve;

the high-pressure pump is arranged in the pump well and used for pressurizing and conveying liquid LNG to the SCV module or the ORV module; the pump well provides a closed container environment for the high-pressure pump and stores liquid LNG pumped from the low-pressure pump; the flow meter is used for metering LNG at the outlet of the high-pressure pump; the governing valve and import and export trip valve are used for adjusting and cutting off the LNG flow of high-pressure pump export.

The LNG receiving station modular structure, wherein: the recondensor module mainly comprises an inlet and outlet valve, a recondensor, an on-site control panel, an on-site instrument and an operation platform;

the inlet and outlet valve is used for controlling the flow of the liquid LNG entering the recondenser module; the recondenser is connected with the inlet and outlet valve and is used for converting redundant BOG gas into liquid LNG; the in-place control panel is for in-place control of the recondenser module; the in-situ meter mainly comprises a liquid level meter and a pressure gauge, and can monitor the state of the recondenser on line.

The LNG receiving station modular structure, wherein: the BOG processing module mainly comprises an inlet and outlet buffer tank, a cooling water station, a lubricating oil station, a BOG compressor body and a dry gas sealing system;

the inlet and outlet buffer tanks are used for stabilizing and buffering gas entering and exiting the BOG compressor; the cooling water station is used for cooling a main machine of the BOG compressor; the lubricating oil station is used for lubricating and cooling the moving parts of the compressor; the dry gas sealing system is used for sealing a piston rod and a piston of the compressor.

The LNG receiving station modular structure, wherein: the SCV module mainly comprises a fan prying block, an air pipe prying block, a water tank prying block, a chimney prying block, an alkali liquor tank prying block, a fuel gas system prying block and a circulating water prying block;

the fan pry block is used for providing combustion air for the SCV module; the air pipe prying block is used for connecting the fan prying block and the water tank prying block; the water tank prying block is used for storing desalted water for heat exchange; the chimney prying block is used for discharging combusted gas; the alkali liquor tank prying block is used for adjusting the pH value of desalted water in the water tank module; the fuel gas system skid is used for providing fuel gas required by combustion of the SCV module; the circulating water prying block is used for circulating desalted water in the water tank module.

The LNG receiving station modular structure, wherein: the ORV module mainly comprises a seawater regulating valve, a main seawater pipeline, an ORV water tank and a heat exchange plate;

the seawater regulating valve is used for regulating the flow of seawater entering the ORV water tank; the main seawater line functions to carry seawater to the ORV water tank; the ORV water tank is used for uniformly distributing seawater on the surface of the heat exchange plate; the heat exchange plate is used for exchanging heat and gasifying liquid LNG and seawater.

The LNG receiving station modular structure, wherein: the torch module mainly comprises a torch, a torch liquid separating tank, a liquid separating tank heater and a local control panel;

the torch is used for combusting the unprocessed BOG gas and discharging waste gas under the driving working condition; the torch liquid separation tank is used for carrying out gas-liquid separation on the device discharge in the liquid separation tank; the local control panel is used for monitoring and controlling the state of the torch locally.

The LNG receiving station modular structure, wherein: the tank car loading and unloading module mainly comprises an electrostatic grounding module, a prying block part, an on-site control cabinet module and a low-temperature oil filling riser module;

the skid block part is used for regulating, metering and cutting off LNG and BOG evaporated gas in the tank car loading skid; the local control cabinet module is used for monitoring and controlling the loading speed and the loading amount of the tank car loading pry; the low temperature oil filling riser module includes liquid phase arm and meteorological arm for be connected tank wagon loading sled and tank wagon.

The invention can realize the following results:

1. the whole investment of equipment (the total cost of equipment cost, field installation and debugging and the like) is reduced.

2. The system functionalization and modularization degree are improved, and the field construction period can be greatly shortened;

3. the service cost of field labor and machines is reduced;

4. the installation, debugging, driving, operation and maintenance are convenient;

5. the module (prying block) is convenient to maintain and replace;

6. the device can be spliced by a 'le gao building block type';

7. the integration level of the device is improved, and the device is suitable for the development direction and trend of large-scale, comprehensive and integrated devices;

8. the factory floor space is saved.

Drawings

FIG. 1 is a schematic block diagram of the present invention;

FIG. 2 is a schematic structural view of a loading and unloading ship module;

FIG. 3 is a schematic structural view of a tank module;

FIG. 4 is a schematic structural view of a high pressure delivery module;

FIG. 5 is a schematic view of a recondenser module;

FIG. 6 is a schematic diagram of the structure of a BOG processing module;

FIG. 7 is a schematic diagram of the structure of an SCV module;

FIG. 8 is a schematic diagram of the structure of the ORV module;

FIG. 9 is a schematic structural view of a flare module;

FIG. 10 is a schematic structural view of a tank car loading module;

FIG. 11 is a schematic structural view of a main tube lane module;

figure 12 is a schematic view of the structure of the connecting tube lane module.

Detailed Description

The invention provides a modular structure of an LNG receiving station, which has a structure shown in figure 1 and comprises a loading and unloading ship module 1, a storage tank module 2, a high-pressure conveying module 3, a recondenser module 4, a BOG processing module 5, an SCV module 6, an ORV module 7, a flare module 8, a tank wagon loading and unloading module 9 and a main pipe gallery module 12, wherein the loading and unloading ship module 1, the storage tank module 2, the high-pressure conveying module 3, the recondenser module 4, the BOG processing module 5, the SCV module 6, the ORV module 7, the flare module 8 and the tank wagon loading and unloading module 9 (which are all process modules) are respectively connected with the main pipe gallery module 12 through a connecting pipe gallery module 11, wherein:

the main pipe gallery module 12, which is used to integrate the various process modules, as shown in fig. 11, mainly includes a nitrogen gas pipeline 124, an instrument wind pipeline 125, a plant air pipeline 126, a low pressure pipeline 127, a high pressure pipeline 128, a BOG pipeline 129, and a drain pipeline 120, wherein the high pressure pipeline 128 is provided with a shut-off valve 121, a control valve 122, and a main electrical instrument bridge 123, and the main electrical instrument bridge 123 is used to connect the various process modules with the MCC and DCS chambers;

wherein the nitrogen pipeline 124, the instrument air pipeline 125 and the factory air pipeline 126 are main utility engineering pipelines and the like, and the functions of the pipelines provide required utility consumption for each process module; the low pressure line 127, the high pressure line 128, the BOG line 129, and the purge line 120 are main process pipes, and function to connect the respective process modules.

The connecting pipe gallery module 11, its function is to connect each technology module and the main pipe gallery module 12, as shown in fig. 12, mainly includes: the branch nitrogen pipeline 114, the branch instrument wind pipeline 115, the branch factory air pipeline 116, the branch low-pressure pipeline 117, the branch high-pressure pipeline 118, the branch BOG pipeline 119 and the branch exhaust pipeline 110, the branch high-pressure pipeline 118 is provided with a branch cut-off valve 111, a branch control valve 112 and a branch electric instrument bridge 113, and the branch electric instrument bridge 113 comprises a branch electric bridge and a branch instrument bridge and has the function of connecting the process module with a main electric instrument bridge in the main pipe gallery module 12.

Wherein the branch nitrogen line 114, the branch instrument wind line 115, and the branch plant air line 116 are branch utility pipes that function to connect the process module with the nitrogen line 124, the instrument wind line 125, and the plant air line 126 in the main pipe rack module; the branch low pressure line 117, the branch high pressure line 118, the branch BOG line 119, and the branch purge line 110 are branch process pipes that function to connect the process module with the low pressure line 127, the high pressure line 128, the BOG line 129, and the purge line 120 in the main pipe rack module.

When the connecting pipe gallery module 11 is connected with the main pipe gallery module 12, the branch nitrogen pipeline 114, the branch instrument wind pipeline 115, the branch plant air pipeline 116, the branch low-pressure pipeline 117, the branch high-pressure pipeline 118, the branch BOG pipeline 119 and the branch exhaust pipeline 110 are connected with the nitrogen pipeline 124, the instrument wind pipeline 125, the plant air pipeline 126, the low-pressure pipeline 127, the high-pressure pipeline 128, the BOG pipeline 129 and the exhaust pipeline 120 in a one-to-one correspondence manner.

The loading and unloading ship module 1 is generally located at a wharf, and the main function of the loading and unloading ship module is to realize unloading from the LNG ship 104 to a storage tank, as shown in fig. 2, the LNG ship 104 is connected with a BOG return line 107, an LNG cold insulation circulation line 105 and an LNG loading ship line 106 through a unloading arm 103, and the BOG return line 107, the LNG cold insulation circulation line 105 and the LNG loading ship line 106 are respectively connected to a branch BOG line 119, a branch low pressure line 117 and a branch high pressure line 118 of the connecting pipe gallery module 11;

the LNG cold insulation circulation pipeline 105 and the LNG ship loading pipeline 106 are further connected to the nitrogen buffer tank 102 by branch lines, the LNG cold insulation circulation pipeline 105 and the LNG ship loading pipeline 106 are further connected to the dock LNG drain tank 101 by pipelines, and the dock LNG drain tank 101 is further connected to the BOG return pipeline 107 by pipelines;

During the unloading process, LNG from the LNG ship 104 is transported to the storage tanks at the quay via the LNG loading pipeline 106, and BOG in the storage tanks is displaced and returned to the LNG ship 104 via the BOG return pipeline 107; after the ship is unloaded, the wharf LNG drain tank 101 can collect the liquid LNG remained in the LNG unloading arm after the ship is unloaded through the LNG cold insulation circulating pipeline 105; the nitrogen buffer tank 102 has a main function of storing nitrogen for purging, and liquid LNG remaining in the discharge arm is purged to the dock LNG purge tank 101 by the nitrogen pressure in the nitrogen buffer tank 102 after the ship is unloaded and stored;

the storage tank module 2, whose main function is to store LNG, as shown in fig. 3, mainly includes: an LNG storage tank 21, process pipelines and valves 22, an in-tank pump 23, an on-tank operation platform 24 and the like;

the LNG storage tank 21 functions to store liquid LNG discharged from the LNG ship; the in-tank pump 23 has a main function of transferring the liquid LNG in the LNG storage tank 21 to the high-pressure transfer module 3; the process lines and valves 22 mainly comprise feed and discharge lines and auxiliary valves, and their main function is to connect the tank module 2 with the handling ship module 1 and the high pressure transport module 3 via the connecting pipe gallery module 11 and the main pipe gallery module 12.

The high pressure delivery module 3, whose function is to pressurize the LNG to the gasification zone, as shown in fig. 4, mainly comprises: a high-pressure pump 31, a pump well 32, a flow meter 33, a regulating valve 34, an inlet/outlet shut-off valve 35, and the like;

a high pressure pump 31 is arranged in the pump well 32, the main function of which is to pressurize the liquid LNG to the SCV module 6 or the ORV module 7; the main function of the pump well 32 is to provide a sealed container environment for the high pressure pump 31, and to store the liquid LNG pumped from the low pressure pump; the flow meter 33 functions to meter the LNG at the outlet of the high-pressure pump 31; the function of the regulating valve 34 and the inlet/outlet shutoff valve 35 is to regulate and shut off the flow rate of LNG at the outlet of the high-pressure pump 31.

The recondenser module 4, which is used to convert BOG to LNG, as shown in fig. 5, mainly includes: an inlet/outlet valve 41, a recondenser 42, a local control panel 43, local instrumentation 44 (e.g., level gauge, pressure gauge, etc.), an operating platform 45;

the inlet and outlet valve 41 mainly controls the flow of liquid LNG entering the recondenser module 4; a recondenser 42 is connected to the inlet/outlet valve 41 and mainly functions to convert the excess BOG gas into liquid LNG; the in-place control panel 43 functions to provide in-place control of the recondenser module 4; the in-situ meters 44, which mainly include a liquid level meter and a pressure gauge, monitor the state of the recondenser on-line;

The BOG processing module 5 is configured to compress BOG boil-off gas, and as shown in fig. 6, mainly includes: an inlet and outlet buffer tank 51, a cooling water station 52, a lubricating oil station 53, a BOG compressor body 54 and a dry gas sealing system 55;

the inlet and outlet buffer tanks 51 function to stabilize and buffer the gas entering and exiting the BOG compressor; the cooling water station 52 functions to cool the main machine of the BOG compressor; the function of the lubricating oil station 53 is to lubricate and cool the moving parts of the compressor; the dry gas seal system 55 functions to seal the piston rod and piston of the compressor;

the SCV module 6 is used for the LNG gasification function, and as shown in fig. 7, mainly includes: a fan pry block 61, an air pipe pry block 62, a water tank pry block 63, a chimney pry block 64, an alkali liquor tank pry block 65, a fuel gas system pry block 66 and a circulating water pry block 67;

the primary function of fan skid 61 is to provide combustion air for the SCV module; the air pipe prying block 62 has the main function of connecting the fan prying block 61 and the water tank prying block 63; the water tank pry block 63 has the main function of storing desalted water for heat exchange; the primary function of the chimney pry 64 is to exhaust combusted gases; the lye tank pry block 65 functions to adjust the pH of the desalinated water in the water tank module 63; the fuel gas system skid 66 functions to provide fuel gas for combustion of the SCV module; the circulating water pry block 67 has the function of circulating the desalted water in the water tank module 63;

The ORV module 7 is used for the LNG gasification function, as shown in fig. 8, and mainly includes: a seawater regulating valve 71, a main seawater pipeline 72, an ORV water tank 73 and a heat exchange plate 74;

the function of the seawater regulating valve 71 is to regulate the flow of seawater into the ORV water tank 73; the main seawater line 72 functions to carry seawater to the ORV water tank 73; the ORV water tank 73 functions to uniformly distribute seawater on the surface of the heat exchange plate 74; the heat exchange plates 74 function to heat exchange and vaporize the liquid LNG with the seawater;

the function of the flare module 8 is that LNG is driven and discharged under emergency conditions, as shown in fig. 9, and the flare module mainly comprises: a torch 81, a torch liquid separation tank 82, a liquid separation tank heater 83, and an in-place control panel 84;

the torch 81 functions to burn unprocessed BOG gas and discharge waste gas in the driving condition; the torch liquid separating tank 82 is used for carrying out gas-liquid separation on the device discharge in the liquid separating tank, wherein gas is discharged to a torch for combustion; the local control panel 84 functions to monitor and control the status of the flare locally;

the tank wagon handling module 9, whose function is LNG tank wagon handling, as shown in fig. 10, mainly includes: an electrostatic grounding module 91, a pry block part 92 (comprising pipelines, valves and instruments), an in-situ control cabinet module 93 and a low-temperature crane pipe module 94;

The prying block part 92 has the functions of regulating, metering and cutting off LNG and BOG evaporated gas in the tank car loading pry; the local control cabinet module 93 has the functions of monitoring and controlling the loading speed and the loading amount of the tank car loading pry; the low temperature oil filling riser module 94 includes a liquid phase arm and a meteorological arm that function to connect the tanker-loading skid with the tanker.

The structural description of each process module is simply introduced only for the composition thereof, because the key point of the present invention is to split each process module, and actually the overall structure of the LNG receiving station and the connection relationship of the internal pipelines thereof belong to the prior art, and a person skilled in the art can clearly understand the specific implementation manner of each process module and how to connect each process module with the main pipe gallery module 12 through the connecting pipe gallery module 11 by combining the drawings and the description, and therefore, the details are not repeated herein.

The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (12)

1. An LNG receiving station modular structure which characterized in that: the system is provided with a loading and unloading ship module, a storage tank module, a high-pressure conveying module, a recondensor module, a BOG processing module, an SCV module, an ORV module, a flare module, a tank wagon loading and unloading module and a main pipe gallery module, wherein the loading and unloading ship module, the storage tank module, the high-pressure conveying module, the recondensor module, the BOG processing module, the SCV module, the ORV module, the flare module and the tank wagon loading and unloading module are respectively connected with the main pipe gallery module through a connecting pipe gallery module.

2. The LNG receiving station modular structure of claim 1, wherein: the main pipe gallery module mainly comprises a nitrogen pipeline, an instrument wind pipeline, a factory air pipeline, a low-pressure pipeline, a high-pressure pipeline, a BOG pipeline and a drain pipeline.

3. The LNG receiving station modular structure of claim 2, wherein: the connecting pipe gallery module mainly comprises a branch nitrogen pipeline, a branch instrument wind pipeline, a branch factory air pipeline, a branch low-pressure pipeline, a branch high-pressure pipeline, a branch BOG pipeline and a branch exhaust pipeline;

the branch nitrogen pipeline, the branch instrument wind pipeline, the branch factory air pipeline, the branch low-pressure pipeline, the branch high-pressure pipeline, the branch BOG pipeline and the branch exhaust pipeline are connected with the nitrogen pipeline, the instrument wind pipeline, the factory air pipeline, the low-pressure pipeline, the high-pressure pipeline, the BOG pipeline and the exhaust pipeline in a one-to-one correspondence mode.

4. The LNG receiving station modular structure of claim 1, wherein: the loading and unloading ship module is used for unloading an LNG ship to a storage tank, the LNG ship is connected with a BOG return pipeline, an LNG cold insulation circulating pipeline and an LNG loading pipeline through a unloading arm, and the BOG return pipeline, the LNG cold insulation circulating pipeline and the LNG loading pipeline are respectively connected to a branch BOG pipeline, a branch low-pressure pipeline and a branch high-pressure pipeline of the connecting pipe gallery module;

the LNG cold insulation circulation pipeline and the LNG shipping pipeline are communicated to the nitrogen buffer tank through branch pipelines, the LNG cold insulation circulation pipeline and the LNG shipping pipeline are further communicated to the dock LNG emptying tank through pipelines, and the dock LNG emptying tank is further communicated to the BOG return pipeline through a pipeline.

5. The LNG receiving station modular structure of claim 1, wherein: the storage tank module mainly comprises an LNG storage tank, a process pipeline, a valve, an in-tank pump and an on-tank operation platform;

the LNG storage tank is capable of storing liquid LNG discharged from an LNG ship; the in-tank pump is used for conveying the liquid LNG in the LNG storage tank to the high-pressure conveying module; the process pipeline and the valve are used for connecting the storage tank module with the loading and unloading ship module and the high-pressure conveying module through the connecting pipe rack module and the main pipe rack module.

6. The LNG receiving station modular structure of claim 1, wherein: the high-pressure conveying module mainly comprises a high-pressure pump, a pump well, a flowmeter, a regulating valve and an inlet and outlet cut-off valve;

the high-pressure pump is arranged in the pump well and used for pressurizing and conveying liquid LNG to the SCV module or the ORV module; the pump well provides a closed container environment for the high-pressure pump and stores liquid LNG pumped from the low-pressure pump; the flow meter is used for metering LNG at the outlet of the high-pressure pump; the governing valve and import and export trip valve are used for adjusting and cutting off the LNG flow of high-pressure pump export.

7. The LNG receiving station modular structure of claim 1, wherein: the recondensor module mainly comprises an inlet and outlet valve, a recondensor, an on-site control panel, an on-site instrument and an operation platform;

the inlet and outlet valve is used for controlling the flow of the liquid LNG entering the recondenser module; the recondenser is connected with the inlet and outlet valve and is used for converting redundant BOG gas into liquid LNG; the in-place control panel is for in-place control of the recondenser module; the in-situ meter mainly comprises a liquid level meter and a pressure gauge, and can monitor the state of the recondenser on line.

8. The LNG receiving station modular structure of claim 1, wherein: the BOG processing module mainly comprises an inlet and outlet buffer tank, a cooling water station, a lubricating oil station, a BOG compressor body and a dry gas sealing system;

the inlet and outlet buffer tanks are used for stabilizing and buffering gas entering and exiting the BOG compressor; the cooling water station is used for cooling a main machine of the BOG compressor; the lubricating oil station is used for lubricating and cooling the moving parts of the compressor; the dry gas sealing system is used for sealing a piston rod and a piston of the compressor.

9. The LNG receiving station modular structure of claim 1, wherein: the SCV module mainly comprises a fan prying block, an air pipe prying block, a water tank prying block, a chimney prying block, an alkali liquor tank prying block, a fuel gas system prying block and a circulating water prying block;

the fan pry block is used for providing combustion air for the SCV module; the air pipe prying block is used for connecting the fan prying block and the water tank prying block; the water tank prying block is used for storing desalted water for heat exchange; the chimney prying block is used for discharging combusted gas; the alkali liquor tank prying block is used for adjusting the pH value of desalted water in the water tank module; the fuel gas system skid is used for providing fuel gas required by combustion of the SCV module; the circulating water prying block is used for circulating desalted water in the water tank module.

10. The LNG receiving station modular structure of claim 1, wherein: the ORV module mainly comprises a seawater regulating valve, a main seawater pipeline, an ORV water tank and a heat exchange plate;

the seawater regulating valve is used for regulating the flow of seawater entering the ORV water tank; the main seawater line functions to carry seawater to the ORV water tank; the ORV water tank is used for uniformly distributing seawater on the surface of the heat exchange plate; the heat exchange plate is used for exchanging heat and gasifying liquid LNG and seawater.

11. The LNG receiving station modular structure of claim 1, wherein: the torch module mainly comprises a torch, a torch liquid separating tank, a liquid separating tank heater and a local control panel;

the torch is used for combusting the unprocessed BOG gas and discharging waste gas under the driving working condition; the torch liquid separation tank is used for carrying out gas-liquid separation on the device discharge in the liquid separation tank; the local control panel is used for monitoring and controlling the state of the torch locally.

12. The LNG receiving station modular structure of claim 1, wherein: the tank car loading and unloading module mainly comprises an electrostatic grounding module, a prying block part, an on-site control cabinet module and a low-temperature oil filling riser module;

The skid block part is used for regulating, metering and cutting off LNG and BOG evaporated gas in the tank car loading skid; the local control cabinet module is used for monitoring and controlling the loading speed and the loading amount of the tank car loading pry; the low temperature oil filling riser module includes liquid phase arm and meteorological arm for be connected tank wagon loading sled and tank wagon.

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