The invention relates to a low-energy-consumption zero-emission evaporated gas treating
system of a
liquefied natural gas (LNG) receiving
station. The characteristics that
wharf unloading pipelines need to be opened in normal operation working conditions and intermittent zero outward conveying working conditions of the LNG receiving
station for cold insulation circulation are utilized, an LNG refrigerating
branch is arranged on a cold insulation circulation pipeline of the existing
wharf discharging pipeline of the LNG receiving
station, LNG is led out from the cold insulation circulation pipeline and further cooled by aid of a refrigerating device, and the cooled LNG is fed back to a previous pre-cooling spraying
system at the top of an
LNG storage tank and sprayed into the
LNG storage tank through the previous pre-cooling spraying
system, so that boiled off gas (
BOG) in the tank can be absorbed, and zero-emission treatment of the
BOG can be achieved. The low-energy-consumption zero-emission evaporated gas treating system is particularly suitable for peak adjusting type LNG receiving stations, can ensure
safe operation of the system under the working conditions of intermittent zero outward conveying, can avoid huge waste caused by the traditional
BOG discharging depressurizing mode and has outstanding economic benefit.