REDUCING FLARING OF BOG'S SHIPS BY INSTALLATION OF AN LNG QUENCHING SYSTEM

摘要

Badak LNG plant is located in Bontang, East Kalimantan, Indonesia. The facility consists of eight LNG Trains with a total production capacity of 22.5 MTPA of LNG.rnBadak has three LNG Loading Docks which is designed to provide a flexibility for loading LNG ship at each of three Docks from any of two of the six Storage tanks. During loading, LNG product from the LNG tanks is pumped to the ship through a pair of the LNG transfer lines. Any return LNG vapor (Boil Off Gas) from the ship is flown to the Marine flare or to the fuel gas system.rnBadak experienced when cooling down an LNG ship's tanks and ship LNG loading, the warm BOG from the ship could not be recovered by the BOG Compressors and has to be flared in order to control the ship's tank pressure.rnTo reduce the gas flaring, Badak installed an LNG Quenching drum to cool the ship's BOG from Docks of -80℃ or warmer to the required suction of the BOG Compressors of -110℃. This effort resulted in reduction of ship BOG flaring approximately 212,500 Nm~3 each ship and resulted in an increase in the Plant thermal efficiency of 0.21%.rnThe LNG quenching is vertical drum equipped with a section of structured packing. Vapor from the dock enters the drum and flows upward through structured packing and contact with LNG taken from Transfer lines. The LNG flow is controlled by gas exiting the top of the drum. Any accumulated LNG in the drum is pumped back to the loading line. By installing this facility, the ship BOG flaring during loading can be significantly reduced and increased Plant thermal efficiency.