JP2014505842A - LNG re-vaporization facility using marine jetty structure - Google Patents

Abstract

A steel or reinforced concrete jetty unit installed in a fixed manner at sea, a storage unit anchored in the jetty unit to provide a space for storing LNG, and regasification of LNG supplied from the storage unit A re-vaporization unit that is modularized to be separated from the jetty unit; an unloading pipe that connects the re-vaporization unit and the storage unit to each other; and An LNG re-vaporization facility using a marine jetty structure comprising: a piping unit including a supply piping for transporting natural gas vaporized by the vaporizing unit.
[Selection] Figure 1

Description

  The present invention relates to a liquefied natural gas (LNG) re-vaporization facility using a marine jetty structure, and more specifically, by applying a modularized LNG re-vaporization facility to a jetty structure installed on the sea. , LNG can be re-vaporized more safely compared to the case where re-vaporization equipment is installed on an LNG ship or when re-vaporization equipment is installed on land, reducing installation costs, operating costs and production time. The present invention relates to an LNG re-vaporization facility using a marine jetty structure.

  The LNG revaporization facility is a facility for vaporizing liquefied natural gas (LNG).

  Facilities that vaporize and supply LNG are roughly classified into land facilities and offshore facilities. An onshore facility has an LNG storage facility and a revaporization facility installed on land, and an offshore facility has a floating structure (generally, an LNG ship) or a fixed structure (GBS: gravity based). Some structures have LNG storage facilities and revaporization equipment (FSRU: floating storage regasification unit), and LNG ships have revaporization facilities (SRV: shuttle regasification vessel) ) Or LNG RV (regasification vessel). SRV or LNG RV is a special marine facility that has its own voyage function and is equipped with a re-vaporization facility on the ship. After LNG is loaded at the production site, it moves to the loading position, and STL (submerged turret loading) ) Is a special vessel that can supply LNG in gas form using the re-vaporization equipment installed on the ship, and has recently been routinely used for natural gas supply in the US and other countries. It was also built at the shipyard. In the case of FRSU, construction of a new offshore structure is also being considered based on the LNG ship, but due to problems such as economic efficiency and delivery time, several used LNG ships have been converted to FRSU, and Latin America, Asia, etc. Supply natural gas at sea.

  When installing a facility that supplies natural gas on land, a large-scale site must be established near the LNG ship's berthing facility, and a large-scale construction must be performed. There is a disadvantage that it is necessary to resolve the petition of neighboring residents, and once it is established, it cannot be transferred. Recently, natural gas has been introduced to the sea for the purpose of supplying natural gas in a short period of time. We are planning to install a facility that can supply gas.

  However, when building LNG ships equipped with new floating structures and re-vaporization facilities for LNG storage and re-vaporization facilities on the sea, it takes a long time of at least several years and a lot of costs. When a used LNG ship is remodeled and used as a floating structure equipped with re-vaporization equipment, the repair time will be as short as one year or as long as several years depending on the age of the used LNG ship and the form of cargo hold. And a great amount of remodeling costs. At this time, in the case of a used LNG ship with a membrane-type cargo hold, structural reinforcement may be necessary for a part of the cargo hold because of the re-vaporization equipment installed on the upper part of the deck. At the time of LNG loading and re-vaporization Frequent LNG liquid level changes may cause partial loading of the LNG in the cargo hold (partial loading), risk of sloshing damage, LNG storage and re-vaporization facilities There are restrictions on the operation of

  On the other hand, in the case of FSRU and SRV, for the purpose of mooring that is stable from the marine climatic environment, the loading arm installed in Jetty is moored in an offshore structure such as jetty. LNG is supplied via a high-pressure gas arm, and high-pressure (typically 40 to 90 atm) natural gas is supplied to the ground via a re-vaporization facility installed on the ship. . At this time, in the case of a moored state, in the case of floating type equipment such as FSRU and LNG RV, it is affected by tidal currents and winds. Inevitably, the loading arm and high-pressure gas arm installed in Jetty, which is a fixed structure, include parts that have mobility to absorb the movement of the hull, and FSRU and LNG RV are tidal currents. By moving with a wave, the pipeline is automatically separated when it is separated from the jetty beyond the operating design range of the loading arm and the high-pressure gas loading arm. A general LNG ship is operated within a few atmospheres when unloading or loading (loading), but the high-pressure gas arm of the FSRU or LNG RV handles high-pressure natural gas. There is always the potential for leaking high pressure natural gas, which is a risk factor for FSRU and LNG RV fires and explosions.

  The present invention has been derived to solve the problems of the background art, and has a construction period longer than that of an FSRU or LNG RV in which a FSRU or LNG RV is newly constructed or a used LNG ship is modified. The object of the present invention is to provide a LNG re-vaporization facility that uses a safer offshore jetty structure while being shortened to save costs.

  As a means for solving the above-mentioned problems, the present invention provides a steel structure or a reinforced concrete structure jetty unit that is fixedly installed on the sea, and a storage unit that is anchored in the jetty unit and provides a space for storing LNG. A re-vaporization unit that is modularized for re-vaporization of LNG supplied from the storage unit, and is installed on the upper part of the jetty unit so as to be separable from the jetty unit, and the re-vaporization unit and the storage A marine jetty structure comprising: an unloading pipe that connects the units to each other; and a pipe unit that includes a supply pipe for transporting the natural gas vaporized by the revaporization unit. Provide LNG re-vaporization equipment using materials.

  Utility equipment including a power source and a seawater pump is modularized so as to supply electric power, seawater, etc. to the re-vaporization unit, and further includes a utility unit detachably installed above the jetty. desirable.

  More preferably, the revaporization unit is in the form of an open rack evaporator using seawater.

  Seawater may be supplied to the re-vaporization unit by simultaneously using the seawater pump of the utility unit and the ballast water pump provided in the storage unit.

  The power supply, steam, and seawater necessary for the re-vaporization unit may be supplied by using power equipment, a steam generator, and a ballast water pump provided in the storage unit.

  Preferably, the storage unit is installed in a fixed manner with respect to the jetty unit, loads LNG from a movable LNG ship or FSU, and transfers it to the revaporization unit.

  The storage unit is preferably installed to be separable from the jetty unit and configured to be movable to load LNG.

  According to the present invention, a re-vaporization facility is installed in a jetty unit that is a fixed structure to re-vaporize LNG, so that re-vaporization is performed with a floating structure while re-vaporizing LNG at sea. It is possible to provide an LNG revaporization facility capable of significantly reducing the risk of high-pressure natural gas leakage that may occur in some cases.

It is a mimetic diagram for explaining the LNG re-vaporization equipment by one embodiment of the present invention.

  Hereinafter, the specific content for implementing this invention is demonstrated by demonstrating the LNG re-vaporization equipment by one Embodiment of this invention, referring drawings.

  FIG. 1 is a schematic diagram for explaining an LNG re-vaporization facility according to one embodiment of the present invention.

  The LNG re-vaporization facility according to the present embodiment is a facility for re-vaporizing LNG at sea and supplying it to land-based natural gas usage destinations. The jetty unit 10, the storage unit 20, the re-vaporization unit 30, and the piping unit 40. And a utility unit 50.

  The jetty unit 10 is fixedly installed on the sea and is made of a steel structure or a reinforced concrete structure. Jetty is used for various purposes, but it is used to mean a structure that separates the inland sea from the open sea, such as a breakwater, or a facility for berthing a ship. It is used. In order to anchor large ships such as large container ships, tankers, and LNG ships, a place where a certain depth of water is secured is required, but jetty connected from the land to the sea is installed, and the berthing facility After the dredging, construction of containers and terminals, etc. will be constructed and used as a berthing facility. In the present invention, the jetty unit 10 is a structure that can be semipermanently installed on the sea and can maintain a constant altitude above sea level even when the height of the water surface changes due to tidal currents, etc. Is not important, and it is sufficient if the storage unit 20 has a structure that can be anchored. The jetty unit 10 is provided with a structure such as a mooring dolphin or a fender for anchoring the storage unit 20, and such a structure is provided for convenience of illustration. For this reason, it is omitted in FIG. 1 (all configurations are shown in a very simplified state in FIG. 1).

  The storage unit 20 is anchored in the jetty unit 10 and provides a space for storing LNG. A used LNG ship can be modified and used, or an LNG FSU (floating storage unit) can be used. On the other hand, the storage unit 20 is fixedly moored to the jetty unit 10 and can be moved separately from the jetty unit 10 if necessary. It is also possible to supply LNG again to the re-vaporization unit 30, re-vaporize while moving to the LNG production base or other FSU, supplied with LNG, and anchored in the Jetty unit 10 again. LNG can also be supplied to the unit 30. In that case, depending on the amount of LNG remaining, other LNG ships can carry LNG, moored on the other side of Jetty, and supply LNG to the re-vaporization unit in order for continuous LNG re-vaporization. .

  Whether the storage unit 20 in a fixed form or the storage unit 20 to be moved is used can be determined in consideration of surrounding conditions, economy, and the like. For example, when a used LNG ship is used as the storage unit 20, the mobility is already secured, so whether to use it in a fixed state or to use it in a fixed state can be determined in consideration of the surrounding conditions. It's fine.

  On the other hand, when a used LNG ship is used as the storage unit 20, generally, in the case of a used LNG ship, the piping is configured so that LNG loading and unloading cannot be performed at the same time. Therefore, it is also necessary to appropriately modify the pipe 21 for loading LNG from the LNG ship and the unloading pipe 41 for unloading LNG at the same time. Further, when the storage unit 20 moves, an appropriate facility for separating the unloading pipe 41 and the storage unit 20 is necessary. In the present embodiment, the storage unit 20 is connected by the LNG loading pipe 21 so that LNG is supplied from the LNG ship. However, the LNG ship may supply LNG directly to the revaporization unit 30. it can. When taking such a configuration, the re-vaporization unit 30 is supplied with LNG from the storage unit 20 and a separate LNG ship (not shown) and vaporizes.

  The storage unit 20 includes utility facilities 22 such as power facilities, steam generators, and ballast water pumps P2, but generally includes facilities such as used LNG ships and FSUs. Therefore, when remodeling a used LNG ship or FSU, no additional equipment is required.

  The re-vaporization unit 30 is modularized for re-vaporization of LNG supplied from the storage unit 20, and is installed so as to be separable from the jetty unit 10. Although the re-vaporization unit 30 is installed on the stationary jetty unit 10, the problem of the maritime re-vaporization unit such as the conventional FSRU and LNG RV is achieved even though LNG is re-vaporized at sea. The risk of natural gas leakage due to the operation of the high-pressure gas arm due to changes in the height of the water surface, the tidal current and wind, and the automatic piping separation due to the separation of the operation range can be basically solved.

  In the present embodiment, the heat exchanger of the re-vaporization unit 30 uses an open rack vaporizer using seawater, which is a system in which seawater flows uniformly from the upper part to the lower part of the heat exchanger. This is a facility for vaporizing LNG, and has the advantages of low initial investment and low operating costs. In the case of this method, if seawater is applied non-uniformly, freezing occurs inside the heat exchanger and the performance of the heat exchanger decreases, so in the re-vaporization equipment of FSRU and LNG RV, which are existing offshore floating equipment, Although it is practically impossible to use, in the case of the present invention, an open rack evaporation, which is a relatively low-priced heat exchange system, is provided by installing a revaporization facility 30 above the fixed jetty unit 10. You can use the machine.

  The seawater is supplied to the open rack evaporator by using a seawater pump P1 provided in the utility unit 50 and a ballast water pump P2 of the utility facility 22 provided in the storage unit 20. FIG. 1 shows that both are used, but it is not necessary to use both. The seawater pump P1 can be used as a main, the ballast water pump P2 can be used as an auxiliary, and the storage unit 20 moves. If so, it may be desirable to use only the seawater pump P1. The method of supplying seawater to the open rack evaporator can also be selected appropriately in consideration of the situation.

  The piping unit 40 connects the revaporization unit 30 and the storage unit 20 to each other, and vaporizes the unloading piping 41 for supplying LNG from the storage unit 20 to the revaporization unit 30. Supply piping 42 for supplying the natural gas to land use. If necessary, a part of the piping unit 40 may be installed below the sea level.

  The utility unit 50 includes a power source for supplying electric power, steam, seawater and the like to the revaporization unit 30, a seawater pump P 1, a steam generator, and the like. It is modularized and installed in the upper part of the jetty unit 10 in a separable manner. The utility unit 50 and the revaporization unit 30 are connected by a power line 51, a seawater pipe 52, a steam pipe 53, and the like. In this embodiment, the power line 51, the seawater pipe 52, and the steam pipe 53 are stored. The utility facilities installed in the unit 20 are connected to each other, and can be used simultaneously or complementarily. Of course, unlike the one shown in FIG. 1, only the utility unit 50 can be used.

  The piping unit 40, the power line 51, the seawater piping 52, and the steam piping 53 illustrated in FIG. 1 are illustrated in a very simplified form for convenience of illustration, and are actually configured to be much more complicated. However, even in such a simple illustration, it is determined that a person skilled in the art to which the present invention belongs can fully understand.

  In the following, a description will be given of functions, operations, and effects of the above-described components by describing a flow for re-vaporizing LNG.

  The LNG stored in the storage unit 20 is supplied to the revaporization unit 30 via the unloading pipe 41, and the LNG in the liquid state supplied to the revaporization facility 30 is in a state vaporized by the revaporization unit 30. Then, the product is transferred to a land use destination via the supply pipe 42.

  The storage unit 20 is used in a state of being semi-fixed to the Jetty 10, and can also load LNG from an LNG ship (supply via a loading pipe 21), while moving by itself from a nearby FSU or LNG production site. LNG is also supplied. If storage units 20 are moving, several storage units 20 are used and natural gas is transferred from the other storage units 20 to the re-vaporization unit 30 while one storage unit 20 moves for LNG loading. It is desirable to supply the natural gas and keep the supply of natural gas.

  Electric power, seawater, steam and the like supplied to the re-vaporization unit 30 are supplied via a modularized utility unit 50.

  As mentioned above, specific contents for implementing the present invention have been provided by describing one desirable embodiment of the present invention, but the technical idea of the present invention is limited to the described embodiment. Instead, the present invention is embodied in various forms of LNG re-vaporization equipment within the scope not departing from the technical idea of the present invention.

Claims (8)

A steel or reinforced concrete jetty unit fixedly installed at sea;
A storage unit anchored in the Jetty unit to provide a space for storing LNG;
A re-vaporization unit that is modularized for re-vaporization of LNG supplied from the storage unit, and is installed on the upper part of the jetty unit so as to be separable from the jetty unit;
A utility unit including a power source and a seawater pump so as to supply electric power or seawater to the re-vaporization unit;
An unloading pipe for connecting the revaporization unit and the storage unit to each other; and a pipe unit including a supply pipe for transporting the natural gas vaporized by the revaporization unit. LNG re-vaporization equipment using marine jetty structures characterized by   The LNG re-vaporization facility using a marine jetty structure according to claim 1, wherein the utility unit is provided in a module form so as to be separable from the jetty unit.   The LNG re-vaporization facility using an offshore jetty structure according to claim 1, wherein the re-vaporization unit is in the form of an open rack evaporator using seawater.   The marine jetty structure according to claim 3, wherein seawater is supplied to the re-vaporization unit by simultaneously using a seawater pump of the utility unit and a ballast water pump provided in the storage unit. LNG re-vaporization equipment.   The marine jetty structure according to claim 1, wherein power, steam, and seawater necessary for the re-vaporization unit are supplied by using power equipment, a steam generator, and a ballast water pump provided in the storage unit. LNG re-vaporization equipment using materials.   The storage unit is installed in a fixed manner with respect to the jetty unit, loads LNG from a movable LNG ship or FSU, and transfers the LNG to the re-vaporization unit. LNG re-vaporization equipment using the described marine jetty structure.   The LNG re-vaporization equipment using a marine jetty structure according to claim 1, wherein the storage unit is installed to be separable from the jetty unit and is moved to load the LNG. .   The LNG re-vaporization facility using a marine jetty structure according to claim 1, wherein the storage unit is an LNG ship or a FSU (floating storage unit).

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