941 results about "LNG storage tank" patented technology

A LNG storage and regasification plant includes a reliquefaction unit in which boil-off vapors from the storage tanks are re liquefied and recycled back to the LNG storage tanks for tank pressure and Wobbe index control. Preferably, LNG cold is used for reliquefaction and operational flexibility is achieved by feeding a portion of the pressurized boil-off gas to a fuel gas header and/or to be recondensed by the sendout LNG.

An LNG terminal is disclosed which includes an offshore mooring turret, an LNG storage vessel operatively coupled to the mooring turret, the LNG storage vessel including at least one LNG storage tank for the storage of liquid natural gas and a regasification vessel operatively coupled to the LNG storage vessel. A method of operating an offshore LNG terminal is also disclosed which includes obtaining liquefied natural gas from at least one LNG storage tank on an LNG storage vessel that is operatively coupled to a mooring turret, regasifying the liquefied natural gas from the LNG storage vessel using a regasification vessel operatively coupled to the LNG storage vessel, and supplying the regasified gas to at least one subsea pipeline via the mooring turret.

Disclosed is a liquid container adapted to store liquefied natural gas (LNG). The LNG storage container include a sealing wall directly contacting liquid contained in the tank and a structural wall, which is an exterior wall or inner structure integrated with the exterior wall. The container further includes a plurality of connectors mechanically connecting the sealing wall and the structural wall and an intermediate wall structure positioned between the structural wall and the interior wall. The intermediate wall structure is configured to move relative to at least one of the interior wall and the structural wall.

The invention relates to design of a high-manganese medium-thickness plate applied to LNG (Liquefied Natural Gas) storage tanks and a production method thereof and belongs to the field of steel materials. The high-manganese medium-thickness plate comprises the following chemical components in percentage by weight: 0.45-0.67% of C, 0.02-0.48% of Si, 23.70-27.20% of Mn, less than or equal to 0.051% of P, less than or equal to 0.02% of S, 0.00-2.20% of Ni, 0.00-4.13% of Cr, 0.00-1.10% of Cu, 0.00-0.94% of Mo, 0.00-0.21% of V, 0.00-4.64% of Al and the balance of Fe and inevitable impurities. The production method of the high-manganese medium-thickness plate comprises the steps of smelting, pouring, forging and rolling. The product obtains a single-phase austenite structure; the experiment steel has high plasticity, simultaneously obtains excellent impact toughness at ultralow temperature of 196 DEG C below zero and has potential for replacing 9% Ni steel; and the cost of the experiment steel is far lower than that of the 9% Ni steel.

The invention discloses an LNG storage tank for a diesel-LNG hybrid power ship. The LNG storage tank comprises a sealed shell and a sealed inner container arranged in the shell, wherein the shell is provided with a first LNG filling pipe communicated with the bottom of the inner container; the inner container is supported in the shell through a plurality of glass steel pipe struts, and a heat insulation layer is wound on the inner container; an interlayer between the shell and the inner container is vacuum; the middle part of the inner container is provided with a wave-proof device; the wave-proof device comprises a central pipe and a support plate; the axis of the central pipe is superposed with the axis of the inner container; and the support plate is trumpet-shaped, an opening at the small end of the support plate is welded with the outer circumference surface of the central pipe, and an opening at the large end of the support plate is welded with the inner wall of the inner container. Because the wave-proof plate with a special structure is arranged in the inner container, impact and oscillation of liquid in the tank body in each direction when the ship runs are reduced, and the safety is ensured. Meanwhile, the LNG storage tank provides proper liquid storage volume and good heat insulation performance, and is fully suitable to be used in the ship.

Disclosed are a method and an apparatus for treating boil-off gas generated in an LNG storage tank of an LNG carrier for transporting LNG in a cryogenic liquid state, the LNG carrier having a boil-off gas reliquefaction plant, wherein an amount of boil-off gas corresponding to a treatment capacity of the reliquefaction plant among the total amount of boil-off gas generated during the voyage of the LNG carrier is discharged from the LNG storage tank and reliquefied by the reliquefaction plant. The boil-off gas treating method and apparatus can maintain an amount of boil-off gas discharged from an LNG storage tank at a constant level by storing in the LNG storage tank, instead of discharging and burning, surplus boil-off gas which has not been returned to the LNG storage tank through the reliquefaction plant among the total amount of boil-off gas generated in the LNG storage tank, and can prevent waste of boil-off gas and save energy by allowing an internal pressure of the LNG storage tank to be increased.

A liquefied natural gas (LNG) transport vessel for transporting liquefied natural gas (LNG) is disclosed which is capable of storing excess boil off gas BOG until needed for combustion in one or more combustion apparatus on the vessel. A method for managing the delivery of the BOG to the combustion apparatus is also described. The LNG vessel includes at least one insulated LNG storage tank which stores LNG. A first stage LNG receiver receives and stores BOG from the at least one LNG storage tank. A second stage or high pressure BOG storage tank receives compressed BOG from the receiver and stores the BOG as needed for combustion by one or more combustion apparatus of the vessel. A pressure regulator allows BOG gas to be delivered to the combustion apparatus if there is sufficient pressure in the high pressure storage tank to passively deliver the BOG at a predetermined delivery pressure. If the pressure in the high pressure BOG storage tank is insufficient to passively delivery the BOG to combustion apparatus, then a combustion apparatus compressor may be used to actively increase the pressure in BOG such that the BOG is delivered at the necessary delivery pressure. If there is still insufficient BOG in the high pressure BOG storage tank, then it may be necessary to supply supplemental auxiliary fuel to meet the needs of the combustion apparatus.

The invention discloses a full-automatic submerged-arc welding solid-core welding wire for high-manganese steel for preparing an LNG storage tank. According to the technical scheme, the full-automatic submerged-arc welding solid-core welding wire comprises 0.25-0.45wt% of C, 23-26wt% of Mn, 6-8wt% of Ni, 3-5wt% of W, 0.02-0.04wt% of N, less than or equal to 0.02wt% of P, less than or equal to 0.001wt% of S and the balance of Fe and inevitable impurities. The full-automatic submerged-arc welding solid-core welding wire has the advantages that the price of adopted alloy elements is low, and an alloy component system is simple; and the low-temperature toughness of weld metal formed by the prepared full-automatic submerged-arc welding solid-core welding wire is excellent, the strength of the full-automatic submerged-arc welding solid-core welding wire is matched with the strength of the ultralow-temperature high-manganese steel for preparing the LNG storage tank, and the technical requirements for the strength and the ultralow-temperature toughness of the welded LNG storage tank can be met.

A high-pressure pressure vessel for storing natural gas comprises a plurality of first vessel regions of first diameters, a plurality of couplers, and a fiber layer. A three dimensional volume is filled using at least in part the plurality of first vessel regions. Each coupler of the plurality of couplers couples each pair of first vessel regions of the plurality of first vessel regions. Each coupler of the plurality of couplers comprises a second vessel region of a second diameter and two third vessel regions that transition diameters between the first diameter and the second diameter. The three dimensional volume is filled using at least in part the plurality of couplers. The first vessel regions and the couplers comprise a material with low permeability to natural gas. The fiber layer surrounds the plurality of first vessel regions and the plurality of couplers.

A fuel gas supply system of a ship is provided for supplying fuel gas to a high-pressure gas injection engine of a ship, wherein LNG is extracted from an LNG tank of the ship, compressed at a high pressure, gasified, and then supplied to the high-pressure gas injection engine.

The invention discloses a cross-critical carbon dioxide energy storage system and method based on utilization of LNG cold energy utilization. The system comprises a carbon dioxide circulation loop; the carbon dioxide circulating loop comprises a liquid carbon dioxide gas storage tank, a first heat exchanger, a second heat exchanger, a compression unit, a supercritical carbon dioxide storage tank and an expansion unit; the outlet of the liquid carbon dioxide storage tank is connected with the inlet of the supercritical carbon dioxide storage tank through the evaporation side of the first heat exchanger and the compression unit; the outlet of the supercritical carbon dioxide storage tank is connected with the inlet of the liquid carbon dioxide air storage tank sequentially through the expansion unit, the condensation side of the first heat exchanger and the condensation side of the second heat exchanger; the evaporation side inlet of the second heat exchanger is connected with an LNG storage tank, and the outlet of the second heat exchanger is connected with the user end to form an LNG utilization loop; and the liquefied carbon dioxide flowing out from the condensing side of the first heat exchanger is further condensed through LNG as a cold source; the compression unit is connected with a motor driven by an off-peak electric motor for energy storage; and the expansion unit is connected with a user through a power generator to carry out energy release.

The invention discloses a cold energy utilizing device for a liquefied natural gas refrigerator truck. The device comprises a fuel gas system and a refrigerating system, wherein the fuel gas system comprises an LNG (liquefied natural gas) storage tank, a plate-fin heat exchanger and a water tank, wherein the LNG comes out of the storage tank, enters the plate-fin heat exchanger to exchange heat with nitrogen, further enters the water tank to exchange heat with the water, and enters an engine to act as the fuel gas. The refrigeration system comprises two coil pipes; the nitrogen is divided into two ways after coming out of the heat exchanger, wherein one nitrogen enters the coil pipe at a refrigeration carriage to exchange heat with the cold air, and the cold air subjected to the heat exchange provides cold energy to the carriage; and the other nitrogen enters the coil pipe in a cab to exchange heat with the air, so as to provide cold air. According to the cold energy utilizing device, the refrigerator truck is provided with the fuel gas, and at the same time the refrigeration carriage and the cab are provided with the cold air of better quality; and the waste of energy is reduced.

The invention relates to a refrigerant phase transformation-free refrigerator for recovering liquefied natural gas (LNG) cold energy, which belongs to the technical fields of energy saving and refrigeration. The refrigerant phase transformation-free refrigerator for recovering LNG cold energy comprises an LNG storage tank, an LNG cryopump, an LNG carburetor, an LNG-refrigerant heat exchanger, a refrigerator heat exchanger, a refrigerator fan, a refrigerant low-temperature storage tank, a low-temperature refrigerant pump and various flow valves. R410A is selected as refrigerant to sequentially enter all refrigerators after obtaining refrigeration amount from LNG, the refrigerant releases the refrigeration amount step by step, and the step utilization of the cold energy is realized. The refrigerant is run in a complete liquid state in the whole process and does not generate phase transformation in heat exchangers of all the refrigerators; and the refrigeration amount transformation needed by the refrigerators is realized by adjusting the rotating speed of the fan and the flow of the refrigerant. The invention has the obvious effects of saving the energy and reducing the discharge.

LNG from a carrier is unloaded to an LNG storage tank in configurations and methods in which expansion of compressed and condensed boil-off vapors from the LNG storage tank provide refrigeration to subcool the LNG that is being unloaded. Most advantageously, such configuration and methods reduce the amount of boil-off vapors and eliminate the need for a vapor return line and associated compressor.

A process is provided for recovering residual boil-off gas from LNG storage tanks at or near atmospheric pressure. Vaporized natural gas is recycled to an eductor to provide a motive force to withdraw residual boil-off gas in a container. The vapor is mixed with intermediate pressure LNG and sent to a vaporizer for down stream processing.

The invention discloses a heat treatment process capable of improving low temperature impact toughness of 9Ni steel. The heat treatment process are as follows: (a) quenching-dual-phase intercritical quenching-tempering (OLT) heat treatment process, wherein the quenching temperature is 830-850 DEG C, the intercritical quenching temperature is 635-655 DEG C and the tempering temperature is 560-600 DEG C; or (b) quenching-quenching-secondary tempering (QQT) heat treatment process, wherein the quenching temperature is 830-850 DEG C, the secondary tempering temperature is 735-755 DEG C, and the tempering temperature is 560-600 DEG C; or (c) normalizing-secondary normalizing-tempering (NNT) heat treatment process, wherein the normalizing temperature is 830-850 DEG C, the secondary normalizing temperature is 735-755 DEG C, and the tempering temperature is 560-600 DEG C; therefore, 9Ni steel with excellent low temperature impact toughness is obtained. The heat treatment process has the advantages that the low temperature impact toughness is improved greatly and the mechanical property of 9Ni steel is optimized while the strength of the 9Ni steel is reduced slightly, so that the 9Ni steel can completely meet the property requirement of large LNG storage cylinders.

The invention discloses a self-supporting type LNG (Liquefied Natural Gas) storage tank which comprises a main storage tank body, wherein the main storage tank body is arranged on a pile foundation and comprises an outer concrete tank and an inner composite steel structure tank which is sleeved in the outer concrete tank; the outer concrete tank comprises a concrete bearing platform, a concrete tank wall and a concrete tank top; the concrete bearing platform is arranged on the pile foundation; and the tank top of the outer concrete tank is communicated with an LNG feeding pipeline, is communicated with an outward LNG transporting system and is also communicated with a pressure protection system. According to the storage tank, a wall plate of the inner tank can bear hydraulic pressures at different position heights by being densely added with rib piece and strengthening ring structures, so that the wall plate is thin, the composite structure can enable the material utilization rate to be high, and the investment cost of the LNG storage tank can be reduced to a great degree; the wall plate of the inner tank is thin, so that most of prefabricating and mounting processes of the wall plate of the inner tank, the rib piece and strengthening string composite structures can be finished in advance in a workshop or a site, and the high-altitude welding amount is reduced; and the compared with the conventional LNG storage tank, the LNG storage tank disclosed by the invention can be used for shortening the construction period.

The invention relates to a liquefaction system and a liquefaction method for NG (Natural Gas). The system comprises a cold box, a supply pipe for supplying the NG to the cold box, a No.1 refrigerant liquefaction subsystem, a No.2 refrigerant liquefaction subsystem, a No.1 refrigerant cooling subsystem, a No.2 refrigerant cooling subsystem, a heavy hydrocarbon separation tank which is used for conducting gas-liquid separation to liquid heavy hydrocarbon and gas light hydrocarbon, and an LNG (Liquefied Natural Gas) storage tank which is used for storing LNG obtained through liquefaction, wherein the cold box comprises an NG precooling passage which is connected with the heavy hydrocarbon separation tank and is used for supplying the NG; an NG deep cooling passage which is connected with the LNG storage tank and is used for supplying the gas light hydrocarbon; a No.1 refrigerant precooling passage and a No.2 refrigerant precooling passage which are used for respectively supplying and cooling high-pressure No.1 refrigerant and high-pressure No.2 refrigerant which are respectively supplied by the No.1 refrigerant liquefaction subsystem the No.2 refrigerant liquefaction subsystem, and are used for respectively supplying the cooled high-pressure No.1 refrigerant and the cooled high-pressure No.2 refrigerant to the No.1 refrigerant cooling subsystem and the No.2 refrigerant cooling subsystem; and a No.1 refrigerant cooling passage and a No.2 refrigerant cooling passage which are used for respectively supplying low-temperature No.1 refrigerant and low-temperature No.2 refrigerant which are respectively supplied by the No.1 refrigerant cooling subsystem and the No.2 refrigerant cooling subsystem to cool the NG, high-temperature No.1 refrigerant and high-temperature No.2 refrigerant. By adopting the technical scheme, the complexity and the energy consumption of the system can be reduced.

The invention relates to a method and system for operating a LNG fuelled marine vessel. The marine vessel (1) comprises a LNG storage tank (3) and a LNG fuelled power plant (71). LNG is stored in the LNG storage tank, and in connection with a bunkering operation the marine vessel is supplied with LNG by connecting a source of LNG to a bunkering line (14) of the marine vessel and subsequently supplying the marine vessel with LNG through the bunkering line. In order to achieve a faster bunkering operation the bunkering line (14) is cooled down prior to the bunkering operation.