LNG Evaporative Gas Reliquefaction System for Small and Medium-sized LNG Fuel Propulsion Ships

摘要

PROBLEM TO BE SOLVED: To promote small and medium-sized LNG fuel which can effectively recycle discarded evaporative gas (BOG) even in a small and medium-sized vessel not provided with a separate reliquefaction system and reduce operating cost and bunker ring cost of the small and medium-sized vessel. Provided is an LNG evaporative gas reliquefaction system for ships. An LNG evaporative gas reliquefaction system 100 for small and medium-sized LNG fuel propulsion vessels that reliquefies evaporative gas (BOG) many times via a large number of heat exchangers, such as an evaporative gas compressor 110 and an in-tank pump 120. , A pressurizing pump 130, a first heat exchanger 140 and a second heat exchanger 150. The evaporative gas compressor 110 pressurizes and compresses the low-pressure evaporative gas generated in the LNG fuel tank 10, and the first heat exchanger 140 and the second heat exchanger 150 are supplied via the in-tank pump 120. The cold heat of the LNG fuel is used to cool the evaporative gas supplied via the evaporative gas compressor 110. By expanding the evaporative gas cooled by the first heat exchanger 140, it is exchanged for liquefied LNG fuel and supplied to the LNG fuel tank 10. [Selection diagram] Fig. 1