Dynamic simulation of LNG import terminal process

The main function of the LNG import terminal is LNG receiving,storage and re-gasification,then supplying natural gas to power plants and city users by pipelines.Through building the dynamic models of each equipment in the LNG import terminal,and adding the necessary control systems,the process was simulated in dynamic mode,and then three operation conditions of the LNG import terminal were analyzed,including seasonal peak shaving,ship unloading and tank overpressure.During the peak shaving of LNG terminal,the power consumption of LNG send-out pump and in-tank pump changed with the same trend as the flow rate of export nature gas.Compressor power consumption and inlet flow rate of re-condenser,including BOG and LNG were affected by the ship unloading condition,which spent 13 h for the entire process.During the tank overpressure accident,which spent 15.2 h for the entire process,compressor power consumption,re-condenser pressure and inlet flow rate of re-condenser changed with the adjustment of compressor load.Finally,some suggestions on the design and operation of the LNG import terminal were proposed.