A bog processing system for lng transport ship

Abstract

The present invention disclosed a LNG transport ship BOG processing system, which includes the LNG supply system, BOG fuel system, hydrational synthesis and vaporization system, and cylinder water heating system.The invention system recycles the excess BOG generated during the anchor of LNG transportation, and makes it a relatively stable natural gas hydrochties to avoid direct discharge into the atmosphere, causing waste of energy and environmental pollution. At the same timeA large amount of cold water released before the use of the use of low temperature water, thereby reducing the energy consumption in the synthesis of natural gas hydraulic compounds, and increasing the energy utilization rate. The invention system does not need to add additional refrigeration equipment to achieve it.And with the widespread application of dual -fuel diesel engines on ships, the invention system has good application value.

Description

technical field [0001] The invention belongs to the technical field of ships, and in particular relates to a BOG processing system of an LNG carrier. Background technique [0002] A liquefied natural gas (LNG) carrier refers to a ship dedicated to transporting liquefied natural gas. LNG is a cryogenic liquid at -163°C, and there is a temperature difference of about 200°C between it and the surrounding environment during transportation. Even if a thermal insulation layer with good heat insulation effect is used, LNG will absorb external heat and evaporate during transportation. In addition, when the ship sails in strong winds and waves, the ship produces violent swaying motion, and the mechanical energy contained in the LNG sloshing process will also be converted into heat energy, which also aggravates the Generation of BOGs. [0003] Normally, an LNG carrier can produce 50t to 60t of BOG a day when it is fully loaded. Since the main component of BOG is methane, the greenho...

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Problems solved by technology

[0006] The patent No. CN103343882B proposes a liquefied natural gas BOG recovery device and recovery method, which recovers the produced BOG in the form of hydrate, avoiding the secondary flash evaporation in the BOG recondensation process, but the structure of the whole system is complex and difficult accomplish

Patent CN106641701 proposes a hydrate method BOG recovery device, which realizes the recovery of BOG in the form of hydrate, but the system uses normal temperature water to decompose hydrate, due to normal temperature water and the low temperature required for the preparation of hydrate The water temperature difference is not very large, so it is not conducive to the complete decomposition of hydrates, and the decomposition efficiency is low

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