Abstract:
본 발명의 탄화수소가스의 액화 시스템에 따르면, 액체 상태의 탄화수소가스가 증발하여 발생된 증발가스의 제1 스트림을 다단 압축장치에서 가압하고, 상기 제1 스트림은 상기 다단압축장치의 모든 단을 통과하여 압축된 후 또는 상기 압축장치의 일부의 단을 통과하여 압축된 후 제2 스트림과 제3 스트림으로 분기되고, 상기 제2 스트림은 엔진에 공급되고, 상기 엔진에서 필요로 하는 연료의 필요량에 따라 상기 제2 스트림의 양은 상기 제1 스트림의 양과 같거나 작게 정해지고, 상기 제3 스트림은 열교환기에서 상기 제1 스트림과의 열교환을 통해 냉각되고, 상기 열교환기에 공급되는 상기 제3 스트림은 상기 다단압축장치에 의해 150 내지 400 bara로 압축되고, 상기 다단압축장치에서 가압되고 상기 열교환기에서 냉각된 상기 제3 스트림은 감압수단에서 감압된다.
Abstract:
Disclosed is a system for treating boil-off gas of a ship having a storage tank storing liquefied natural gas; and an engine using the liquefied natural gas stored in the storage tank as fuel. The system for treating boil-off gas of a ship includes a first stream of boil-off gas discharged from the storage tank after being generated from the liquefied natural gas in the storage tank; a second stream of boil-off gas branched from the first stream to be supplied to the engine as fuel when the amount of the first stream is greater than the amount of fuel required by the engine; and a third stream of boil-off gas not supplied to the engine among the first stream. The third stream is liquefied by heat exchange with the first stream in a heat exchanger, thereby treating boil-off gas without using a reliquefying device having a separate freezing cycle.
Abstract:
The present invention relates to a boil-off gas treatment system for treating boil-off gas discharged from a storage tank in which liquefied gas is stored. According to the present invention, the boil-off treatment system for treating boil-off gas discharged from a storage tank in which liquefied gas is stored comprises a compressor for compressing boil-off gas generated in a storage tank; a heat exchanger for cooling the boil-off gas compressed by the compressor; and an expansion unit for decreasing the pressure of the boil-off gas cooled by the heat exchanger. The heat exchanger heat-exchanges the boil-off gas compressed by the compressor and the boil-off gas discharged from the storage tank and supplied to the compressor.
Abstract:
Disclosed is a coolant cycle system with an enhanced heat transfer performance. The coolant cycle system with an enhanced heat transfer performance of the present invention includes: a coolant cycling unit which circulates a coolant; and a heat exchanger which exchanges heat with the coolant. The coolant creates a pulsating flow in the coolant circling system to enter the heat exchanger.
Abstract:
PURPOSE: A two-phase fluid supply device for a microchannel heat exchanger and a method thereof are provided to evenly disperse a two-phase fluid to each microchannel layer by moving gas and liquid of a two-phase fluid when the two-phase fluid is supplied to an inlet of the microchannel heat exchanger. CONSTITUTION: A two-phase fluid supply device for a microchannel heat exchanger comprises a gas and liquid separator(11) and a mixer(12). The gas and liquid separator separates gas and liquid of a two-phase fluid. The mixer includes mixed space inside and evenly mixes the liquid and the gas.
Abstract:
PURPOSE: A fuel supply system and method for an offshore structure with a high pressure natural gas injection engine and a re-liquefying device are provided to save energy for re-liquefying evaporation gas. CONSTITUTION: A fuel supply system with a heat exchanger for recovering cold energy comprises a storage tank(11), a unit(13) for compressing evaporation gas, a re-liquefying device(60), a high pressure pump(33), a high pressure vaporizer(37), and a heat exchanger(70) for recovering cold energy. The re-liquefying device comprises a cold box(61), a multistage compression unit, a gas-liquid separator(64), and a refrigerant expansion valve(65). The cold box re-liquefies the evaporation gas by heat exchanging a refrigerant with the evaporation gas. The multistage compression unit comprises a plurality of refrigerant compressors and refrigerant coolers. The gas-liquid separator separates the refrigerant discharged from the multistage compression unit into liquid and gas states. The refrigerant expansion valve decreases the temperature of the refrigerant.
Abstract:
PURPOSE: A fuel supply system for a high-pressure natural gas injection engine with a surplus BOG(boil-off gas) consumption unit is provided to reduce the heat duty of a high pressure evaporator and the thermal stress applied to a heat exchanger. CONSTITUTION: A fuel supply system for a high-pressure natural gas injection engine with a surplus BOG consumption unit comprises a BOG compression unit, a re-liquefying device, a high pressure pump, a high pressure vaporizer, and a surplus BOG consumption unit. The BOG compression unit is supplied with BOG from a storage tank, and compresses the BOG at 12~45 bar. The re-liquefying device liquefies the compressed BOG. The high pressure pump compresses the liquefied BOG. The high pressure vaporizer vaporizes the BOG, and supplies the BOG to the high-pressure natural gas injection engine. The surplus BOG consumption unit consumes the difference between the BOG generated from the storage tank and the BOG needed in the engine. [Reference numerals] (AA) Storage tank; (BB) Evaporated gas compressor; (CC) Saving the energy for re-liquefying; (DD) Heavy boil off gas; (EE) Re-liquefying apparatus; (FF) Fuel gas supply system; (GG) High pressure liquid boil off gas; (HH) ME-GI engine