CN116202016B - Integrated LNG shore-based filling system - Google Patents

Integrated LNG shore-based filling system Download PDF

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Publication number
CN116202016B
CN116202016B CN202211579599.XA CN202211579599A CN116202016B CN 116202016 B CN116202016 B CN 116202016B CN 202211579599 A CN202211579599 A CN 202211579599A CN 116202016 B CN116202016 B CN 116202016B
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China
Prior art keywords
port
filling
module
storage tank
pump
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CN202211579599.XA
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CN116202016A (en
Inventor
张皓威
徐建浩
邵雪锋
王俊凯
王健
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Shanghai MicroPowers Co Ltd
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Shanghai MicroPowers Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
    • F17C5/02—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with liquefied gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The invention discloses an integrated LNG shore-based filling system, which comprises: the filling device comprises an adiabatic pump sled, and a filling module, a pressurizing module and an NG purging module which are arranged in the adiabatic pump sled, wherein the filling module comprises a filling joint, a first immersed pump, a second immersed pump, a liquid phase flowmeter, a regulating valve and a filling arm, the filling joint is respectively connected with a first port of the first immersed pump and a first port of the second immersed pump, a second port of the first immersed pump and a second port of the second immersed pump are respectively connected with a first port of the liquid phase flowmeter, a second port of the liquid phase flowmeter is connected with a first port of the regulating valve, and a second port of the regulating valve is connected with the filling arm. According to the invention, through the modularized design, the device has the advantages of compact structure, small occupied space, convenience in installation and transportation, and high filling quantity and high filling speed due to the double-pump arrangement.

Description

Integrated LNG shore-based filling system
Technical Field
The invention relates to the technical field of natural gas equipment, in particular to an integrated LNG shore-based filling system.
Background
The demand for clean energy is increasing, especially in the marine shipping industry. By the end of 6 months of 2022, there are 696 LNG ships in total worldwide, of which about 80% are project ships. Only 2022, 1 to 8 months, there are 111 LNG ship orders worldwide. In 2021, the number of ocean-going LNG power vessels is 251 times as large as 119 LNG power vessels in 2017, and the number of LNG power vessels is 225 LNG power vessels, which is 300% as large as 56 LNG power vessels in 2020. The latest data published by Norway DNV on day 1,5, 2022 show that if the trend can be maintained, the total number of LNG powered ocean-going vessels at the end of the year will be up to 1000. As the number of LNG carriers and power vessels increases, the demand for LNG shore-based filling systems increases. However, the existing shore-based filling system is slow in filling speed, relatively bulky, and not modularized and centralized, so that the increasingly-growing requirements cannot be met.
Therefore, there is a need to design an integrated LNG shore-based filling system to address the above-described issues.
Disclosure of Invention
Aiming at the technical problems, the invention aims to provide an integrated LNG shore-based filling system which is compact in structure, small in occupied space, convenient to install and transport, high in filling quantity and high in filling speed due to the arrangement of double pumps through the modularized design.
To achieve the above object, the present invention provides an integrated LNG shore-based filling system, comprising: the filling device comprises an adiabatic pump sled, and a filling module, a pressurizing module and an NG purging module which are arranged in the adiabatic pump sled, wherein the filling module comprises a filling joint, a first immersed pump, a second immersed pump, a liquid phase flowmeter, a regulating valve and a filling arm, the filling joint is respectively connected with a first port of the first immersed pump and a first port of the second immersed pump, a second port of the first immersed pump and a second port of the second immersed pump are respectively connected with a first port of the liquid phase flowmeter, a second port of the liquid phase flowmeter is connected with a first port of the regulating valve, and a second port of the regulating valve is connected with the filling arm.
In some embodiments, the filling joint comprises a liquid phase filling joint and a gas phase filling joint, a first port of the liquid phase filling joint is connected with the storage tank, and a second port of the liquid phase filling joint is connected with a first port of the first immersed pump and a first port of the second immersed pump respectively; the first port of the gas phase filling joint is connected with the storage tank, and the second port of the gas phase filling joint is respectively connected with the first port of the first immersed pump and the first port of the second immersed pump.
In some embodiments, further comprising: a storage tank filling line;
The storage tank filling pipeline comprises an LNG filling pipeline and a BOG return air pipeline, the LNG filling pipeline is connected with the storage tank, and the BOG return air pipeline is connected with the first port of the gas phase filling joint.
In some embodiments, the filling module further comprises a gas phase flow meter, a first port of the gas phase flow meter being connected to the filling arm, and a second port of the gas phase flow meter being connected to the first port of the gas phase filling joint.
In some embodiments, the pressurization module includes a plunger pump and a vaporizer, a first port of the plunger pump is connected with the LNG fill line, a second port of the plunger pump is connected with the first port of the gas phase fill joint and the first port of the vaporizer, respectively, and a second port of the vaporizer is connected with the BOG return line and the NG purge module, respectively.
In some embodiments, the NG purge module includes a NG gas tank having a first port connected to the second port of the gasifier and a second port connected to the second port of the liquid phase fill connector and the second port of the regulator valve, respectively.
In some embodiments, the filling module further comprises a cold-keeping circulation line, a first port of the cold-keeping circulation line being connected to a second port of the regulating valve, a second port of the cold-keeping circulation line being connected to a second port of the liquid phase filling joint.
In some embodiments, further comprising: a safety diffusing module;
The safety diffusing module comprises an EAG heater, a diffusing tower and a plurality of safety valves, wherein a first port of the EAG heater is connected with the storage tank and each connecting pipeline through the safety valves respectively, and a second port of the EAG heater is connected with the diffusing tower.
In some embodiments, further comprising: a nitrogen purging module;
The nitrogen purging module comprises a nitrogen storage tank, a nitrogen conveying pipe and a plurality of purging pipes, wherein the nitrogen conveying pipe is connected with a first port of the nitrogen storage tank and used for conveying nitrogen to enable preset pressure to be kept in the nitrogen storage tank, a second port of the nitrogen storage tank is connected with a plurality of first ports of the purging pipes respectively, and a plurality of second ports of the purging pipes are connected with inlet ends of the filling arms respectively.
In some embodiments, further comprising: an instrument wind module;
The instrument wind module comprises a one-way valve and a plurality of pneumatic valves, and the pneumatic valves are connected with the second port of the nitrogen storage tank through the one-way valves and used for providing air sources required by opening and closing the emergency cut-off valve for the system.
Compared with the prior art, the integrated LNG shore-based filling system provided by the invention has at least one of the following beneficial effects:
1. According to the integrated LNG shore-based filling system provided by the invention, through the modularized design, each module of the system is integrated in the standard container body, so that the integrated LNG shore-based filling system has a compact structure, small occupied space and convenient installation and transportation; and the double pumps are arranged, so that the requirements of different flow can be met in a frequency conversion and cooperation mode, the filling quantity is large, and the filling speed is high.
2. According to the integrated LNG shore-based filling system provided by the invention, one flowmeter is respectively arranged in a liquid phase filling pipeline and a gas phase return pipeline, the two flowmeters are integrated in an adiabatic pump sled, and the flow difference between the liquid phase flowmeter and the gas phase flowmeter is used as the actual value of filling quantity; according to the calculation mode, the loss of BOG in the fuel ship is considered, so that a more accurate filling value can be obtained; the heat preservation circulation pipeline is arranged, so that the immersed pump and the flowmeter are always in a low-temperature state in the non-working time of the system, the precooling time of key equipment can be reduced, and the metering precision is ensured.
3. According to the integrated LNG shore-based filling system provided by the invention, the arranged nitrogen storage tank can be used for inerting a pipeline when the system is just started or stopped, the arranged NG storage tank is inflated by adopting a combination of the plunger pump and the vaporizer to replace the NG storage tank after nitrogen purging, and the LNG remained in the pipeline can be blown to the injected fuel tank after filling is completed; the pressurizing module adopts a mode of combining a gasifier and a plunger pump, so that the pressurizing module can pressurize the LNG storage tank and also can pressurize the NG storage tank.
Drawings
The above features, technical features, advantages and implementation of the present invention will be further described in the following description of preferred embodiments with reference to the accompanying drawings in a clear and easily understood manner.
FIG. 1 is a flow chart of an integrated LNG shore-based filling system in accordance with a preferred embodiment of the present invention;
FIG. 2 is a flow chart of a preferred embodiment of the priming module of the present invention;
FIG. 3 is a flow chart of the metering function of the preferred embodiment of the present invention;
FIG. 4 is a flow chart of a preferred embodiment boost module of the present invention;
FIG. 5 is a flow chart of a preferred embodiment pressurization module and purge module of the present invention;
FIG. 6 is a flow chart of a preferred embodiment of the insulated circulating line of the present invention;
FIG. 7 is a flow chart of a preferred embodiment security diffusion module of the present invention;
FIG. 8 is a flow chart of a preferred embodiment nitrogen purge module of the present invention.
Reference numerals illustrate:
The heat insulation pump skid 1, the filling module 2, the liquid phase filling joint 21, the gas phase filling joint 22, the first immersed pump 23, the second immersed pump 24, the liquid phase flowmeter 25, the regulating valve 26, the filling arm 27, the liquid phase port 271, the gas phase port 272, the gas phase flowmeter 28, the cold insulation circulation pipeline 29, the storage tank 3, the LNG filling pipeline 31, the BOG return pipeline 32, the pressurizing module 4, the plunger pump 41, the gasifier 42, the NG purging module 5, the NG gas storage tank 51, the safety purging module 6, the EAG heater 61, the purging tower 62, the safety valve 63, the nitrogen purging module 7, the nitrogen storage tank 71, the nitrogen delivery pipe 72, the purging pipe 73, the check valve 74 and the pneumatic valve 75.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will explain the specific embodiments of the present invention with reference to the accompanying drawings. It is evident that the drawings in the following description are only examples of the invention, from which other drawings and other embodiments can be obtained by a person skilled in the art without inventive effort.
For simplicity of the drawing, only the parts relevant to the invention are schematically shown in each drawing, and they do not represent the actual structure thereof as a product. Additionally, in order to simplify the drawing for ease of understanding, components having the same structure or function in some of the drawings are shown schematically with only one of them, or only one of them is labeled. Herein, "a" means not only "only this one" but also "more than one" case.
It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
In this context, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless explicitly stated or limited otherwise; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, in the description of the present application, the terms "first," "second," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.
In one embodiment, referring to fig. 1 and 2 of the specification, the integrated LNG shore-based filling system provided by the present invention includes: the adiabatic pump sled 1 and set up filling module 2, pressurization module 4 and NG in adiabatic pump sled 1 sweep module 5. The filling module 2 comprises a filling joint, a first immersed pump 23, a second immersed pump 24, a liquid phase flowmeter 25, a regulating valve 26 and a filling arm 27, wherein the filling joint is respectively connected with a first port of the first immersed pump 23 and a first port of the second immersed pump 24, a second port of the first immersed pump 23 and a second port of the second immersed pump 24 are respectively connected with a first port of the liquid phase flowmeter 25, a second port of the liquid phase flowmeter 25 is connected with a first port of the regulating valve 26, and a second port of the regulating valve 26 is connected with the filling arm. The LNG filling flow is as follows: the storage tank 3, the first immersed pump 23, the second immersed pump 24, the liquid phase flowmeter 25, the regulating valve 26, the filling arm 27 and the fuel ship.
Specifically, the filling joint comprises a liquid phase filling joint 21 and a gas phase filling joint 22, wherein a first port of the liquid phase filling joint 21 is connected with the storage tank 3, and a second port of the liquid phase filling joint 21 is respectively connected with a first port of the first immersed pump 23 and a first port of the second immersed pump 24; the first port of the gas phase filling joint 22 is connected to the tank 3, and the second port of the gas phase filling joint 22 is connected to the first port of the first immersed pump 23 and the first port of the second immersed pump 24, respectively.
Further, the integrated LNG shore-based filling system further includes: a tank filling line for delivering LNG to the tank 3; the tank filling line includes an LNG filling line 31 and a BOG return line 32, the LNG filling line 31 being connected to the tank 3, the BOG return line 32 being connected to the first port of the gas phase filling joint 22.
In the embodiment, through the modularized design, each module of the system is integrated in the heat-insulating pump sled 1, so that the heat-insulating pump sled is compact in structure, small in occupied space and convenient to install and transport; and the double pumps are arranged, so that the requirements of different flow can be met in a frequency conversion and cooperation mode, the filling quantity is large, and the filling speed is high. The actual filling flow of the LNG filling station which is known to operate is about 20-30 m 3/h, factors such as project requirements, actual demands and project cost are comprehensively considered, two immersed pumps with rated flow of 30m 3/h are arranged in the heat-insulating pump sled 1, and the requirements of different flow within 60m 3/h are met through frequency conversion and cooperation; and each module is integrated in a 20-square standard container, so that the installation and the transportation are more convenient.
In one embodiment, referring to fig. 3 of the drawings, the filling module 2 further comprises a gas phase flow meter 28, wherein a first port of the gas phase flow meter 28 is connected to the filling arm 27, and a second port of the gas phase flow meter 28 is connected to a first port of the gas phase filling joint 22. The metering flow is as follows: the storage tank 3, the first immersed pump 23, the second immersed pump 24, the liquid phase flowmeter 25, the regulating valve 26, the liquid phase port 271 of the filling arm 27, the fuel vessel, the gas phase port 272 of the filling arm 27, the gas phase flowmeter 28 and the storage tank 3.
By arranging a flowmeter in each of the liquid-phase filling pipeline and the gas-phase return pipeline, the two flowmeters are integrated in the adiabatic pump sled 1, and the flow difference of the liquid-phase flowmeter 25 and the gas-phase flowmeter 28 is used as the actual value of filling quantity; in this way, a more accurate filling value can be obtained taking into account the amount of BOG lost in the fuel vessel. If in actual use, owners put forward higher metering requirements, a heat value instrument and an online heat value measuring function can be added, and the purity of the LNG can be monitored in real time. And the flowmeter works simultaneously, so that the benefits of customers are guaranteed, and the customers are more relieved when the customers are injected. However, the increase of the equipment increases the cost of the whole system.
Specifically, referring to fig. 3 of the specification, the liquid phase filling joint 21 is connected with the first immersed pump 23 through a pipeline, and a manual stop valve, a pneumatic stop valve, a pressure transmitter, a pressure gauge and a temperature display which are connected through ball valves are sequentially arranged on the pipeline. The gas-phase filling connection 22 is connected to a first immersed pump 23 via a line, on which a pneumatic shut-off valve is arranged. The liquid phase filling joint 21 is connected with the second immersed pump 24 through a pipeline, and a manual stop valve, a pneumatic stop valve, a pressure transmitter, a pressure gauge and a temperature display which are connected through ball valves are sequentially arranged on the pipeline. The gas-phase filling connection 22 is connected to a second immersed pump 24 via a line, on which a pneumatic shut-off valve is arranged. The first immersed pump 23 and the second immersed pump 24 are respectively connected with a temperature transmitter, a temperature display, a booster pump, a connection port of a safety diffusion module and the like. A one-way valve and a temperature transmitter are respectively arranged between the first immersed pump 23, the second immersed pump 24 and the liquid phase flowmeter 25. A connection port of the pressure transmitter and the safety diffusing module is arranged between the liquid phase flowmeter 25 and the regulating valve 26. A pressure transmitter and a pressure gauge which are connected through ball valves, a manual stop valve, a connecting port of a safety relief module, a pneumatic stop valve, a connecting port of the safety relief module and a purging pipe which is connected through a one-way valve are sequentially arranged between the regulating valve 26 and the filling arm 27. The filling arm 27 is connected with a purging pipe connected through a one-way valve, and a purging pipe connected through a one-way valve, a connecting port of a safety relief module, a pneumatic stop valve, a connecting port of the safety relief module and a manual stop valve are sequentially arranged between the filling arm 27 and the gas phase flowmeter 28. A one-way valve is provided between the gas phase flow meter 28 and the gas phase fill connector 22.
In one embodiment, referring to fig. 4 of the specification, the pressurization module 4 includes a plunger pump 41 and a vaporizer 42, wherein a first port of the plunger pump 41 is connected to the LNG filling line 31, a second port of the plunger pump 41 is connected to a first port of the gas phase filling joint 22 and a first port of the vaporizer 42, respectively, and a second port of the vaporizer 42 is connected to the BOG return line 32 and the NG purge module 5, respectively.
Specifically, a manual stop valve is provided between the plunger pump 41 and the LNG filling line 31, and a temperature transmitter, a connection port of the safety bleeding module, and a check valve are provided between the plunger pump 41 and the gas phase filling joint 22 and between the plunger pump 41 and the vaporizer 42. A temperature transmitter, a one-way valve, a pressure transmitter and a pressure gauge which are connected through ball valves and a manual stop valve are respectively arranged between the gasifier 42 and the BOG return air pipeline 32 and between the gasifier 42 and the NG purge module 5.
Further, referring to fig. 5 of the specification, the NG purge module 5 includes a NG air tank 51, a first port of the NG air tank 51 is connected to the second port of the gasifier 42, and a second port of the NG air tank 51 is connected to the second port of the liquid phase filling joint 21 and the second port of the regulating valve 26, respectively. The unique NG purging function, through the NG gas holder 51 that sets up, adopts plunger pump 41 and vaporizer 42 combination, inflates for NG gas holder 51, carries out the replacement after the nitrogen purging, also can blow the residual LNG in the pipeline to the fuel tank of annotating after the filling is accomplished.
Wherein, a manual stop valve and a one-way valve are sequentially arranged between the NG gas storage tank 51 and the gasifier 42. A manual stop valve, a connecting port of a safety relief module, a one-way valve, a purging pipe, a manual stop valve or a starting stop valve are respectively arranged between the NG gas tank 51 and the liquid phase filling joint 21 and between the NG gas tank 51 and the regulating valve 26.
In the embodiment, a plunger pump 41 and a gasifier 42 are adopted to supply air to a NG air storage tank 51 for pressurization, and two plunger pump 41 return air pipelines are arranged in the system in consideration of the need of pre-cooling before the plunger pump 41 works, and one path of air is directly led to the gas phase space of the LNG storage tank; when the vapor space pressure is high, the return gas is inconvenient to return, then the valve to the EAG pipe is opened, and the return gas is discharged through the EAG pipe. And a temperature sensor is arranged on the return air pipeline, when the temperature is detected to be low, a signal that the pre-cooling of the plunger pump is finished can be obtained remotely, and then the pump is started to carry out supercharging work. In order to prevent the downstream pressure from being too high, a safety discharge device is arranged on the downstream pipeline in consideration of the working characteristics of the plunger pump in pressurization.
The main function of the NG purge module 5 is for purging, which is required in both cases. First case: when the pump is first installed or needs to be restarted after a long period of time without use (no LNG in the pump tank), the nitrogen needs to be replaced with NG after the pump tank or piping has been inerted. Second case: at the end of filling, the LNG after the flowmeter needs to be blown into the LNG fuel tank using NG. In operation in the second case, the gas phase spaces of the onshore tank and the LNG fuel tank on the ship are in communication with each other. The gas phase space pressure is generally between 0.5 and 0.7MPa during filling, so that the NG purge tank pressure is required to be higher than 0.7MPa during purging by using BOG. In the scheme, the NG purge tank pressure is set between 0.8 and 1.0MPa in consideration of smaller resistance of the purge pipe section and minimized purge time. The NG tank pressure is derived from the immersed pump, so when selecting the pump, the pump outlet pressure is required to be not lower than 1.0MPa.
In one embodiment, referring to fig. 6 of the drawings, the filling module 2 further comprises a cold-keeping circulation line 29, a first port of the cold-keeping circulation line 29 being connected to a second port of the regulating valve 26, and a second port of the cold-keeping circulation line 29 being connected to a second port of the liquid-phase filling joint 21. The cold insulation circulation pipeline 29 is provided with a manual stop valve and a connection port of the safety diffusing module. The cold insulation circulation flow is as follows: the storage tank 3, the first immersed pump 23, the second immersed pump 24, the liquid phase flowmeter 25, the regulating valve 26, the cold insulation circulation pipeline 29, the first immersed pump 23 and the second immersed pump 24.
In this embodiment, by providing the cold insulation circulation line 29, the immersed pump and the flowmeter tube section can be kept in a cold state at all times in the filling gap. When the function is started, the immersed pump only needs to be operated at the lowest rotating speed, so that LNG flows through the flowmeter and the regulating valve bypass pipe at a smaller flow rate, and then returns to the inlet of the pump pool. So as to ensure that the reaction can be fast when filling is performed next time; and the condition that metering is inaccurate due to frequent cold and hot alternation of equipment such as a flowmeter is avoided.
In one embodiment, referring to fig. 7 of the specification, the integrated LNG shore-based filling system further comprises: a security diffusion module 6. The safety diffusing module 6 comprises an EAG heater 61, a diffusing tower 62 and a plurality of safety valves 63, wherein the safety valves 63 are used as connecting ports of the safety diffusing module 6, the first ports of the EAG heater 61 are respectively connected with the storage tank 3 and each connecting pipeline through the safety valves 63, and the second ports of the EAG heater 61 are connected with the diffusing tower 62. The safe diffusing flow is as follows: the storage tank 3 or each connecting pipeline, a safety valve 63, an EAG heater 61, a flame arrester and a diffusing tower 62. Wherein, the connection port on the liquid phase pipeline needs to be heated by the EAG heater 61 and then enters the diffusing tower 62, and the connection port on the gas phase pipeline can directly enter the diffusing tower 62.
In this embodiment, when the system pressure is higher than the setting pressure of the relief valve, the relief valve automatically releases pressure to protect the system, and the relief valve can be opened manually to release the pressure. After the EAG is discharged from each position through the safety valve and the process pipeline, the temperature is still low, about-107 ℃, an EAG heater 61 is required to be arranged, and after the EAG is heated to normal temperature, the EAG is discharged into the atmosphere through a diffusing tower 62. Considering the safety and environmental protection problem possibly generated by direct emission, the NG collecting tank and the ignition device can be arranged on the main emission pipeline to intensively burn and then emit EAG and BOG.
In one embodiment, referring to fig. 8 of the specification, the integrated LNG shore-based filling system further comprises: the nitrogen purge module 7. The nitrogen purging module 7 comprises a nitrogen storage tank 71, a nitrogen conveying pipe 72 and a plurality of purging pipes 73, wherein the nitrogen conveying pipe 72 is connected with a first port of the nitrogen storage tank 71 and used for conveying nitrogen to enable preset pressure to be kept in the nitrogen storage tank 71, a second port of the nitrogen storage tank 71 is respectively connected with a first port of the plurality of purging pipes 73, and a second port of the plurality of purging pipes 73 is respectively connected with an inlet end or a connecting pipeline of the filling arm 27. The nitrogen purging module 7 is mainly used for inerting pipelines and pump ponds, and ensures the safety of the system. Generally, when the whole system is started for the first time, nitrogen is adopted to replace air; or when the liquid is to be used for a long time after filling, the LNG or NG is replaced by nitrogen.
Further, the integrated LNG shore-based filling system further includes: an instrument wind module; the instrument wind module comprises a check valve 74 and a plurality of pneumatic valves 75, wherein the plurality of pneumatic valves 75 are connected with a second port of the nitrogen storage tank 71 through the check valve 74 and are used for providing a gas source required by opening and closing the emergency shut-off valve for the system. The instrument wind module is used for providing an air source required by opening and closing the emergency cut-off valve, the air pressure is generally controlled to be 0.4-0.7 MPa, and the instrument wind module and the nitrogen purging module 7 adopt the same pipeline.
In the foregoing embodiments, the descriptions of the embodiments are focused on, and the parts of a certain embodiment that are not described or depicted in detail may be referred to in the related descriptions of other embodiments.
It should be noted that the above embodiments can be freely combined as needed. The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.

Claims (7)

1. An integrated LNG shore-based filling system, comprising: the filling device comprises an adiabatic pump sled, and a filling module, a pressurizing module and an NG purging module which are arranged in the adiabatic pump sled, wherein the filling module comprises a filling joint, a first immersed pump, a second immersed pump, a liquid phase flowmeter, a regulating valve and a filling arm, the filling joint is respectively connected with a first port of the first immersed pump and a first port of the second immersed pump, a second port of the first immersed pump and a second port of the second immersed pump are respectively connected with a first port of the liquid phase flowmeter, a second port of the liquid phase flowmeter is connected with a first port of the regulating valve, and a second port of the regulating valve is connected with the filling arm;
The filling joint comprises a liquid phase filling joint and a gas phase filling joint, a first port of the liquid phase filling joint is connected with the storage tank, and a second port of the liquid phase filling joint is respectively connected with a first port of the first immersed pump and a first port of the second immersed pump; the first port of the gas phase filling joint is connected with the storage tank, and the second port of the gas phase filling joint is respectively connected with the first port of the first immersed pump and the first port of the second immersed pump;
further comprises: a storage tank filling line;
the storage tank filling pipeline comprises an LNG filling pipeline and a BOG return air pipeline, the LNG filling pipeline is connected with the storage tank, and the BOG return air pipeline is connected with a first port of the gas phase filling joint;
The filling module further comprises a gas phase flowmeter, a first port of the gas phase flowmeter is connected with the filling arm, and a second port of the gas phase flowmeter is connected with the first port of the gas phase filling joint;
The metering flow is as follows: the method comprises the steps of storing a tank, a first immersed pump, a second immersed pump, a liquid phase flowmeter, a regulating valve, a liquid phase port of a filling arm, a fuel ship, a gas phase port of the filling arm, a gas phase flowmeter and a storage tank, wherein the flow difference between the liquid phase flowmeter and the gas phase flowmeter is used as an actual filling amount value.
2. An integrated LNG shore based filling system according to claim 1, wherein,
The pressurizing module comprises a plunger pump and a gasifier, a first port of the plunger pump is connected with the LNG filling pipeline, a second port of the plunger pump is respectively connected with a first port of the gas phase filling joint and a first port of the gasifier, and a second port of the gasifier is respectively connected with the BOG return air pipeline and the NG purging module.
3. An integrated LNG shore based filling system according to claim 2, wherein,
The NG purging module comprises a NG gas storage tank, a first port of the NG gas storage tank is connected with a second port of the gasifier, and a second port of the NG gas storage tank is respectively connected with a second port of the liquid phase filling joint and a second port of the regulating valve.
4. An integrated LNG shore based filling system according to claim 1, wherein,
The filling module further comprises a cold insulation circulating pipeline, a first port of the cold insulation circulating pipeline is connected with a second port of the regulating valve, and a second port of the cold insulation circulating pipeline is connected with a second port of the liquid phase filling joint.
5. The integrated LNG shore-based filling system of claim 1, further comprising: a safety diffusing module;
The safety diffusing module comprises an EAG heater, a diffusing tower and a plurality of safety valves, wherein a first port of the EAG heater is connected with the storage tank and each connecting pipeline through the safety valves respectively, and a second port of the EAG heater is connected with the diffusing tower.
6. The integrated LNG shore-based filling system of claim 1, further comprising: a nitrogen purging module;
The nitrogen purging module comprises a nitrogen storage tank, a nitrogen conveying pipe and a plurality of purging pipes, wherein the nitrogen conveying pipe is connected with a first port of the nitrogen storage tank and used for conveying nitrogen to enable preset pressure to be kept in the nitrogen storage tank, a second port of the nitrogen storage tank is connected with a plurality of first ports of the purging pipes respectively, and a plurality of second ports of the purging pipes are connected with inlet ends of the filling arms respectively.
7. The integrated LNG shore-based filling system of claim 6, further comprising: an instrument wind module;
The instrument wind module comprises a one-way valve and a plurality of pneumatic valves, and the pneumatic valves are connected with the second port of the nitrogen storage tank through the one-way valves and used for providing air sources required by opening and closing the emergency cut-off valve for the system.
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CN1106905A (en) * 1992-12-07 1995-08-16 芝加哥桥及铁技术服务公司 Method and apparatus for fueling vehicles with liquefield natural gas
CN111174086A (en) * 2018-11-12 2020-05-19 乔治洛德方法研究和开发液化空气有限公司 Method and apparatus for storing and dispensing liquefied hydrogen

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US8028724B2 (en) * 2007-02-12 2011-10-04 Daewoo Shipbuilding & Marine Engineering Co., Ltd. LNG tank and unloading of LNG from the tank
CN108006432A (en) * 2017-12-15 2018-05-08 杰瑞石油天然气工程有限公司 A kind of LNG bank bases formula loading system peculiar to vessel

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CN1106905A (en) * 1992-12-07 1995-08-16 芝加哥桥及铁技术服务公司 Method and apparatus for fueling vehicles with liquefield natural gas
CN111174086A (en) * 2018-11-12 2020-05-19 乔治洛德方法研究和开发液化空气有限公司 Method and apparatus for storing and dispensing liquefied hydrogen

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