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Self-developed LNG Sub-cooling System (LSC) successfully commissioned and delivered
Release time :
2024-05-31
On May 31, 2024, SMDERI QET successfully completed all the sea trial tests and delivered the LNG Sub-cooling System (LSC) for the 14,000m³ LNG Bunker Vessel built by Hudong-Zhonghua Shipbuilding (Group) Co., Ltd, which was unanimously affirmed by the shipowner, the shipyard and the classification society.
The LNG Sub-Cooling System (LSC) constitutes the core equipment of the cargo system of an LNG Bunker Vessel. Utilising the cold volume generated by the compression and expansion of nitrogen and helium, the system enables deep cooling of the LNG. The LNG is then sprayed back into the tank to achieve re-balancing liquefaction of BOG.The LNG Sub-Cooling System (LSC) can only avoids economic loss and greenhouse hazards caused by direct combustion and emission of BOG, but also ensure that the temperature and pressure inside the liquid cargo tank are in the appropriate range, and reduces the generation of BOG at source. It has the advantages of stability, high efficiency, safety, reliability, and maintenance-free for a long period of time.
R&D team of SMDERI QET spent 3 years to successfully break through the deep cryogenic process dynamic simulation, magnetic levitation bearing control, high-speed permanent magnet motor, high efficiency fluid mechanical design and other key technologies, and successfully developed a high-power magnetic levitation compression/expansion unit, to achieve -175 ℃ high efficiency and large cooling capacity output.
During the trial voyage, the LNG Sub-Cooling System (LSC) developed by SMDERI QET underwent system full-load operation performance and reliability testing under actual ship conditions, including maximum ship acceleration and maximum inclination and sway.The results indicated that the equipment met the design specifications and the requirements for practical shipboard applications. It could achieve efficient control of the LNG tank pressure and effectively reduce CH4 emissions.
In addition, the LNG Sub-cooling System (LSC) for the30,000m3 LNG Bunker Vessel developed by SMDERI QET in conjunction with CNOOC Gas & Power Group has completed the factory performance test. In the field of large ocean-going LNG vessels, the R&D team has started the development of a large-scale LSC of 1.7T/h, and it is expected to complete the land tests within this year. By that time, SMDERI QET will form a series of LSC design and supply capacity.
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