JP2014088163A - Floating structure equipped with power plant, and arrangement structure thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a floating structure including at least one power generator room disposed in a central portion within a hull of the floating structure and at least one fuel tank disposed in each of both sides of the power generator room.SOLUTION: A floating structure F equipped with a power plant is disclosed. The floating structure equipped with a power plant includes: at least one power generator room 100 disposed in a central portion within a hull of the floating structure; and at least one fuel tank 200 disposed in each of both sides of the power generator room.

Description

  The present invention relates to a floating structure on which a power plant is mounted and an arrangement structure thereof, and more specifically, at least one power generation chamber is disposed at the center of the floating structure inside a hull, The present invention relates to a floating structure in which at least one fuel tank is disposed.

  Natural gas is a fossil fuel mainly composed of methane and containing a small amount of ethane, propane, etc. In recent years, it has attracted attention as a low pollution energy source in various technical fields. Have been bathed.

  Natural gas may be transported in a gas state or liquefied natural gas (LNG), i.e., stored in a LNG transport vessel in a liquefied state, and may be transported to a distant consumption location. Liquefied natural gas is obtained by cooling natural gas to an extremely low temperature (about -163 ° C or lower), and its volume is reduced to about 1/600 compared to natural gas in the gas state. Very suitable for.

  In recent years, along with the depletion of energy buried in land, development of various marine resources has become active, but securing and development of oil wells and gas wells for mining crude oil and natural gas at sea is also the first in each country. It is advanced to fight.

  For this reason, a lot of floating offshore structures such as LNG FPSO (Floating Production Storage and Offloading) and LNG FSRU (Floating Storage and Reconfiguration Unit) have been developed as facilities for producing LNG at sea.

  Since LNG is relatively inexpensive and does not generate much pollution, it can be said that LNG is suitable for power generation fuel.

  Conventionally, power plants using LNG as fuel have been generally installed mainly on land, particularly near the coast where the supply and demand of raw materials is easy and the cost for securing land is low.

  Vessels and offshore structures that can generate power by appropriately arranging them in places where raw material supply and demand is convenient or where power supply is necessary, while reducing the cost of purchasing plant sites and foundation construction, away from the fixed power plant on land Technology to mount a power plant on things is required.

  Among them, there is a high demand for technology that installs a power plant in floating offshore structures such as barges and supplies the necessary electricity to the offshore structures themselves, or technology that produces a lot of electricity at sea and transmits it to land. It has become.

  FIG. 1 schematically shows a barge 1 equipped with a power plant. The fuel tank 13 is mounted on the hull 11 of the barge 1 and various facilities 20 of the power plant are mounted on the deck of the barge 1.

  In this way, when installing a power plant on a floating offshore structure such as a barge, the power generation and transmission equipment may cause a fire due to sparks, leakage, short circuit, etc. In addition to the power plant, various safety devices for preventing the occurrence of fire are installed.

  Furthermore, floating offshore structures such as LNG FPSO that boring, producing, refining, and storing crude oil or gas are offshore structures that handle explosive gases.・ The risk of explosion is even higher, and various safety equipment should be provided to cope with this.

  Thus, conventional floating offshore structures that handle explosive gases and substances require various additional equipment to prevent explosions. Therefore, various facilities of power plants are mounted on the deck of floating offshore structures. In addition, various safety facilities are added, and the space and work space for installing other facilities may be lost.

  In addition, the power plant such as the power generation room and the power transmission facility and the additional equipment for preventing the explosion are all mounted on the top (top side), thereby increasing the load of the floating offshore structure itself. Problems in the structure of offshore structures are likely to occur, and the concentration of the center of weight at the top can make it difficult to restore and maintain balance of floating offshore structures.

  Because of these problems, it is difficult to produce a large amount of electricity by installing a large power plant on the offshore structure, and only small-scale power generation that supplies the necessary electricity to the offshore structure itself is possible. It is.

  The present invention is to solve such a problem. The power generation chamber is arranged below the deck of the offshore structure, and the power generation chamber and the fuel tank are balanced inside the offshore structure inside the hull. It is an object of the present invention to provide a floating structure that can reduce the center of weight and to secure a space on the deck of the floating structure.

  According to one aspect of the present invention, in a floating structure on which a power generation plant is mounted, at least one power generation chamber disposed at the center of the hull of the floating structure and both sides of the power generation chamber, respectively. A floating structure is provided on which a power plant including at least one fuel tank is disposed.

  By arranging the power generation chamber and the fuel tank inside the hull, the center of weight of the floating structure can be lowered.

  A ballast tank may be disposed at at least one end of the floating structure.

  At least one power transmission tower for transmitting electricity produced in the power generation chamber to the outside of the floating structure may be provided on the deck above the power generation chamber.

  The fuel used for power generation in the power generation chamber may be LNG.

  A vaporizer may be provided on the floating structure deck to vaporize LNG stored in the fuel tank and supply the LNG as power generation fuel to the power generation chamber.

  The space ratio of the at least one power generation chamber and the at least one fuel tank in the hull of the floating structure may be 30:70 to 50:50.

  The power generation chamber can generate power using the ME-GI engine as a main engine.

  According to another aspect of the present invention, in the arrangement structure of the floating structure on which the power generation plant is mounted, the power generation chamber and the fuel tank are arranged below the deck of the floating structure, and the center below the deck is arranged. The power generation chamber is disposed in a portion, the fuel tanks are disposed on both sides of the power generation chamber, and a space ratio between the power generation chamber and the fuel tank is 30:70 to 50:50. An arrangement structure of a floating structure on which is mounted is provided.

  A power transmission tower for transmitting the electricity produced in the power generation chamber may be provided on the deck above the power generation chamber.

  A ballast tank may be disposed at at least one end of the floating structure.

  In the floating structure on which the power plant of the present invention is mounted, at least one power generation chamber is disposed in the center of the hull of the floating structure, and at least one fuel tank is disposed on each side of the power generation chamber. Thus, the center of weight can be lowered to secure a space on the deck of the floating structure. In addition, by providing a ballast tank at least at one end of the floating structure, the previously-consumed ballast tank on the fuel tank side can be filled with seawater to maintain the balance of the floating structure.

It is a figure showing roughly a barge ship carrying a power plant. It is a figure which shows roughly the side cross section of the floating structure in which the plant for electric power generation by one Embodiment of this invention is mounted.

  For a full understanding of the invention and the operational advantages thereof and the objects achieved by the practice of the invention, reference should be made to the accompanying drawings that illustrate preferred embodiments of the invention and the contents described in the accompanying drawings. Should.

  Hereinafter, the present invention will be described in detail by explaining preferred embodiments of the invention with reference to the attached drawings.

  FIG. 2 is a diagram schematically showing a side cross section of a floating structure F on which a power plant according to an embodiment of the present invention is mounted.

  As shown in FIG. 2, the floating structure F on which the power plant according to an embodiment of the present invention is mounted includes at least one power generation chamber 100 disposed in the center of the hull of the floating structure F, And at least one fuel tank 200 disposed on each side of the power generation chamber 100.

  In this embodiment, the floating structure F refers to a floating marine platform that floats on the sea surface, and has a propulsion device inside itself or a tugboat on the sea without having a propulsion device. It includes any towed floating marine platform, an example being a barge.

  In the present embodiment, the center of weight of the floating structure F can be lowered by arranging the power generation chamber 100 and the fuel tank 200 inside the hull.

  The power generation chamber 100 is provided with a main engine 110 and a heavy power generation facility such as a generator. By placing such a heavy power generation facility in the power generation chamber 100 provided in the center of the hull, a floating structure is provided. The center of weight of the object F can be lowered to the lower part of the hull to enhance safety, and the balance of the hull can be easily maintained. Further, by arranging the power generation chamber 100 in the center without being biased to one side of the floating structure F, the floating structure is also used when an engine or a generator inside the power generation chamber 100 is further installed in order to increase the power generation capacity. It is easy to maintain the balance of the object F.

  A ballast tank (not shown) may be disposed at at least one end of the floating structure F.

  In the present embodiment, since the power generation chamber 100 is provided in the center of the hull, there are advantages in terms of maintaining the balance of the COG (Center Of Gravity) and the hull and securing the space on the deck.

  Thus, in this embodiment, since the heavy power generation chamber 100 is provided in the center of the hull, the balance of the hull can be easily maintained. However, the fuel in the fuel tanks 200 on both sides of the power generation chamber 100 is consumed at the same time. There is a possibility that the fuel in the one fuel tank 200 is consumed first. In this case, another ballast tank is disposed at least at one end of the floating structure F, that is, at the end of the hull, for ballasting. By arranging the ballast tank at the end, the ballast effect can be enhanced even with a small amount of ballast water by the lever principle.

  It is preferable to simultaneously consume the fuel stored in the fuel tanks 200 on both sides for maintaining the balance of the floating structure F. However, since it is difficult to supply the fuel in this way, A ballast tank (not shown) is disposed at one end. For example, a ballast tank (not shown) is arranged on the stern side, and the stern side ballast tank (not shown) is matched to the weight of the fuel that decreases while the fuel in the stern side fuel tank 200 is supplied to the power generation chamber 100 first. The balance of the floating structure F can be maintained by filling the seawater.

  A side wall of the hull and a lower ballast tank (not shown) may be disposed together as provided in a conventional floating offshore structure or ship. For example, ballast tanks (not shown) may be arranged on the side wall and the lower part outside the fuel tank 200 inside the hull.

  On the deck D above the power generation chamber 100, at least one power transmission tower 300 that transmits electricity generated in the power generation chamber 100 to the outside of the floating structure F may be provided.

  The power transmission tower 300 can be provided in consideration of the power generation capacity. By providing the power transmission tower 300 on the deck D above the power generation room 100, the main cable of the power transmission tower 300 can be directly connected to the power generation room 100, and the produced electricity Thus, the high-voltage transmission line provided in the floating structure F can be minimized.

  The fuel used for power generation in the power generation chamber 100 may be LNG.

  A vaporizer may be provided on the deck D of the floating structure F to vaporize LNG stored in the fuel tank 200 and supply it to the power generation chamber 100 as power generation fuel.

  The space ratio of at least one power generation chamber 100 and at least one fuel tank 200 in the hull of the floating structure F may be 30:70 to 50:50, more preferably 40:60. There may be.

  In the power generation chamber 100, the ME-GI engine can generate power as the main engine 110.

  The ME-GI engine is an engine that can be used on ships, and is a high-pressure natural gas injection engine for LNG carriers that has been developed and used to reduce emissions of nitrogen oxides (NOx) and sulfur oxides (SOx). It is. ME-GI engines can be installed in offshore structures such as LNG carriers that store and transport LNG (Liquid Natural Gas) in storage tanks that can withstand cryogenic temperatures, and use natural gas as fuel. Depending on the load, a high gas supply pressure of about 150-400 bara (absolute pressure) is required.

  In the case of a marine structure equipped with a high-pressure natural gas injection engine such as an ME-GI engine, a reliquefaction device is used to process evaporative gas (Boil Off Gas; BOG) generated in the LNG storage tank. Is still needed. ME-GI engine is the next generation environmentally-friendly engine that can reduce pollutant emissions by 23% for carbon dioxide, 80% for nitrogen compounds and 95% for sulfur compounds compared to diesel engines with the same level of output. Have been bathed.

  In the present embodiment, such a ME-GI engine is disposed in the power generation chamber 100 in the floating structure F and is used as the main engine 110 to generate power. In the power generation chamber 100, a generator using an alternator that generates an alternating current using electromagnetic induction may be provided on a shaft of the main engine 110.

  According to another aspect of the present invention, in the arrangement structure of the floating structure F on which the power generation plant is mounted, the power generation chamber 100 and the fuel tank 200 are arranged below the deck D of the floating structure F, The power generation chamber 100 is disposed at the center below the deck D, the fuel tanks 200 are disposed on both sides of the power generation chamber 100, and the space ratio between the power generation chamber 100 and the fuel tank 200 is 30:70 to 50:50. An arrangement structure of the floating structure F on which the characteristic power plant is mounted is provided.

  A power transmission tower 300 for transmitting electricity produced in the power generation chamber 100 may be provided on the deck D above the power generation chamber 100.

  A ballast tank (not shown) may be disposed on at least one end of the floating structure F.

  As described above, the floating structure F on which the power plant according to the present embodiment is mounted has at least one power generation chamber 100 disposed in the center of the hull, and at least one fuel on each side of the power generation chamber 100. By disposing the tank 200, the center of weight can be lowered and a space can be secured on the deck D of the floating structure F.

  Further, by arranging the ballast tank at least at one end of the floating structure F, the balance of the floating structure F can be maintained by filling the ballast tank on the fuel tank 200 side that has been consumed first with seawater.

  By arranging the power generation chamber 100 inside the hull and lowering the center of weight, it is possible to carry out mass power generation by mounting a large-scale power generation facility without fear of maintaining the structure or balance of the floating structure F.

  Moreover, since sufficient space is secured on the deck D, when other equipment is arranged on the deck D, work efficiency is not limited by the power generation equipment and various piping necessary for power generation. Can be placed in consideration.

  In addition, it is expected that a sufficient work space can be secured on the deck D, and the work environment of the worker can be greatly improved, thereby reducing the risk of accidents occurring during work.

  The present invention is not limited to the above embodiment, and various modifications and variations can be made without departing from the spirit and scope of the present invention. It is obvious to those who have it. Accordingly, such modifications or variations fall within the scope of the claims of the present invention.

F: Floating structure D: Deck 100: Power generation chamber 110: Main engine 200: Fuel tank 300: Transmission tower

Claims (11)

In a floating structure equipped with a power plant,
A floating structure on which a power generation plant including at least one power generation chamber disposed in a central portion of the hull of the floating structure and at least one fuel tank disposed on both sides of the power generation chamber is mounted.   The floating structure mounted with the power plant according to claim 1, wherein the center of weight of the floating structure is lowered by arranging the power generation chamber and the fuel tank inside the hull.   The floating structure mounted with the power plant according to claim 1, wherein a ballast tank is disposed at at least one end of the floating structure.   The power plant according to claim 1, wherein at least one power transmission tower for transmitting electricity produced in the power generation chamber to the outside of the floating structure is provided on a deck above the power generation chamber. Mounted floating structure.   The floating structure having the power plant according to claim 1, wherein the fuel used for power generation in the power generation chamber is LNG.   The power plant according to claim 5, wherein a vaporizer is provided on the deck of the floating structure to vaporize LNG stored in the fuel tank and supply the LNG as power generation fuel to the power generation chamber. Mounted floating structure.   2. The power plant according to claim 1, wherein a space ratio of the at least one power generation chamber and the at least one fuel tank in the hull of the floating structure is 30:70 to 50:50. Floating structure equipped with   2. The floating structure mounted with the power plant according to claim 1, wherein the power generation chamber generates power using a ME-GI engine as a main engine. In the layout structure of floating structures with power plants,
A power generation chamber and a fuel tank are disposed below the deck of the floating structure, the power generation chamber is disposed at the center below the deck, the fuel tanks are disposed on both sides of the power generation chamber, An arrangement structure of a floating structure on which a power plant is mounted, wherein a space ratio with the fuel tank is 30:70 to 50:50.   The arrangement structure of a floating structure on which a power plant according to claim 9 is mounted, wherein a power transmission tower for transmitting electricity produced in the power generation chamber is provided on a deck above the power generation chamber.   The arrangement structure of the floating structure on which the power plant according to claim 9 is mounted, wherein a ballast tank is arranged at least at one end of the floating structure.

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