Light hydrocarbon recovery technology for LNG receiving terminal

The invention discloses a light hydrocarbon recovery technology for an LNG receiving terminal. The light hydrocarbon recovery technology for the LNG receiving terminal comprises the steps that firstly, LNG in a storage tank is pressurized through a low pressure pump in the storage tank, and then the LNG is discharged out of the storage tank and enters a high pressure output pump to be pressurized; the high pressure output pump conducts pressurization on the LNG, and the pressurized LNG enters a first-stage gasifier to be gasified after the pressure of the LNG reaches the output pressure; part of the gasified LNG enters a gas-liquid separator through a first pipeline, the two phases of gas and liquid are separated in the gas-liquid separator, liquid phase LNG, ethane and a small amount of gas phase NG enter a light hydrocarbon recovery device through a second pipeline, the light hydrocarbon recovery device separates the LNG from the ethane, the LNG and the ethane are collected into respective storage tanks, and the small amount of the gas phase NG enters a second-stage gasifier after being pressurized through a pressurizing machine; and the gas phase NG is continuously heated in the second-stage gasifier, and when the temperature of the gas phase NG reaches the output temperature, the gas phase NG enters an output pipe network after being metered through a metering output system. According to the recovery technology, the recovery process is milder, therefore, the energy consumption of the device is reduced, the requirement for materials of the device is reduced, and the operating risks of the device are lowered to some extend.