Abstract: A fuel gas supply system of a vessel, such as an LNG carrier, is provided for supplying fuel gas to a high-pressure gas injection engine of an LNG carrier, wherein LNG is extracted from an LNG storage tank of the LNG carrier, compressed at a high pressure, gasified, and then supplied to the high-pressure gas injection engine. In one embodiment, the system includes a boil-off gas reliquefaction apparatus for reliquefying boil-off gas generated in the LNG tank.

Abstract: A fuel gas supply system of a vessel, such as an LNG carrier, is provided for supplying fuel gas to a high-pressure gas injection engine of an LNG carrier, wherein LNG is extracted from an LNG storage tank of the LNG carrier, compressed at a high pressure, gasified, and then supplied to the high-pressure gas injection engine. In one embodiment, the system is operated to supply fuel to an MEGI engine.

Abstract: 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.

Abstract: Disclosed is an apparatus for producing nitrogen equipped in a marine structure such as a liquefied natural gas regasification vessel (LNG RV) and a floating storage and regasification unit (FSRU), and a method for producing nitrogen in a marine structure using the apparatus. The apparatus for producing nitrogen equipped in a flowing marine structure produces nitrogen to be mixed with natural gas to be supplied to consumers after regasification. The floating marine structure in which the apparatus is equipped has an LNG regasification facility for compressing the LNG stored in a storage tank using a high-pressure pump and then vaporizing the LNG into natural gas in a vaporizer to supply natural gas to consumers. The apparatus for producing nitrogen secures cold heat necessary to produce nitrogen using the LNG supplied from the storage tank.

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

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

Abstract: Disclosed herein is an apparatus and method for liquefied natural gas (LNG) carrier propulsion. In the apparatus and method, the propulsion of an LNG carrier is done by only a single main diesel engine and has construction to promptly cope with emergencies caused by malfunction of the main diesel engine. The propulsion apparatus for an LNG carrier comprising a boil-off gas re-liquefaction apparatus for re-liquefying boil-off gas generated in LNG storage tanks to return re-liquefied boil-off gas back to the LNG storage tank comprises a single main diesel engine, a propulsion shaft separably connected to the main diesel engine, and an electric motor for propulsion separably connected to the propulsion shaft and supplied with power intended for operation of the boil-off gas re-liquefaction apparatus.

Abstract: Disclosed is a liquefied natural gas storage apparatus. The apparatus includes a heat insulated tank and liquefied natural gas contained in the tank. The tank has heat insulation sufficient to maintain liquefied natural gas therein such that most of the liquefied natural gas stays in liquid. The contained liquefied natural gas has a vapor pressure from about 0.3 bar to about 2 bar. The apparatus further includes a safety valve configured to release a part of liquefied natural gas contained in the tank when a vapor pressure of liquefied natural gas within the tank becomes higher than a cut-off pressure. The cut-off pressure is from about 0.3 bar to about 2 bar.

Abstract: Disclosed is a liquefied natural gas storage apparatus. The apparatus includes a heat insulated tank and liquefied natural gas contained in the tank. The tank has heat insulation sufficient to maintain liquefied natural gas therein such that most of the liquefied natural gas stays in liquid. The contained liquefied natural gas has a vapor pressure from about 0.3 bar to about 2 bar. The apparatus further includes a safety valve configured to release a part of liquefied natural gas contained in the tank when a vapor pressure of liquefied natural gas within the tank becomes higher than a cut off pressure. The cut off pressure is from about 0.3 bar to about 2 bar.

Abstract: Disclosed is a liquefied natural gas storage apparatus. The apparatus includes a heat insulated tank and liquefied natural gas contained in the tank. The tank has heat insulation sufficient to maintain liquefied natural gas therein such that most of the liquefied natural gas stays in liquid. The contained liquefied natural gas has a vapor pressure from about 0.3 bar to about 2 bar. The apparatus further includes a safety valve configured to release a part of liquefied natural gas contained in the tank when a vapor pressure of liquefied natural gas within the tank becomes higher than a cut-off pressure. The cut-off pressure is from about 0.3 bar to about 2 bar.

Abstract: An oxidation catalyst unit for a wet-type electrophotographic image forming apparatus which oxidizes a carrier vapor generated in a fusing unit and method for controlling the same are provided. The wet-type electrophotographic image forming apparatus includes a photoconductive medium, a laser scanning unit scans a laser beam onto the photoconductive medium, a developing unit develops a developer on the photoconductive medium, a transfer unit transfers the developer on the photoconductive medium to a recording medium, a fusing unit fixes the developer on the recording medium, and an oxidation catalyst unit oxidizes and resolves a carrier vapor generated in the fusing unit. The oxidation catalyst unit comprises a duct connected to the fusing unit to guide the carrier vapor generated in the fusing unit into the oxidation catalyst unit, a fan for guiding the carrier vapor into the duct, and a controller for varying a velocity of the fan according to data.

Abstract: A developer supply and recovery system used with a wet electro-photographic image forming apparatus includes a supply pump installed on a supply line to supply a developer from an ink cartridge to a development bath, a recovery pump installed on a recovery line to recover the developer from a developer container to the ink cartridge, an overflow sensor installed at the developer container to sense the developer overflowing from the development bath, a control unit to control the supply pump and the recovery pump in response to a sensed value of the overflow sensor, wherein operation states of the supply pump and the recovery pump are sensed, and the developer is appropriately contained in the developer container such that air is not introduced together with the developer recovered to the recovery pump, thereby reducing noise.

Abstract: An oxidation catalyst unit for a wet-type electrophotographic image forming apparatus which oxidizes a carrier vapor generated in a fusing unit. The wet-type electrophotographic image forming apparatus comprises a photoconductive medium, a laser scanning unit scans a laser beam onto the photoconductive medium, a developing unit develops a developer on the photoconductive medium, a transfer unit transfers the developer on the photoconductive medium to a recording medium, a fusing unit fixes the developer on the recording medium, and an oxidation catalyst unit oxidizes and resolves a carrier vapor generated in the fusing unit. The oxidation catalyst unit comprises a duct connected to the fusing unit to guide the carrier vapor generated in the fusing unit into the oxidation catalyst unit, a fan for guiding the carrier vapor into the duct, and a controller for varying a velocity of the fan according to data.

Abstract: A developer supply and recovery system used with a wet electro-photographic image forming apparatus includes a supply pump installed on a supply line to supply a developer from an ink cartridge to a development bath, a recovery pump installed on a recovery line to recover the developer from a developer container to the ink cartridge, an overflow sensor installed at the developer container to sense the developer overflowing from the development bath, a control unit to control the supply pump and the recovery pump in response to a sensed value of the overflow sensor, wherein operation states of the supply pump and the recovery pump are sensed, and the developer is appropriately contained in the developer container such that air is not introduced together with the developer recovered to the recovery pump, thereby reducing noise.

Abstract: A color registration control method is provided. The color registration control method includes developing a registration pattern with predetermined colors by overlapping a left-half pattern and a right-half pattern of a second pattern, and a left-half pattern and a right-half pattern of a first pattern, which are arranged symmetrically to a center, respectively, in a scanning direction; detecting density information of the left-half pattern and the right-half pattern of the registration pattern by using a first and a second density sensor, and sending the detected information to a comparator; calculating a color registration error by comparing the density of the left-half pattern with the density of the right-half pattern; and outputting from the control unit a color registration control signal according to an error signal received by the comparator.