Abstract
The boil-off gas (BOG) recondensation system is one of the most important facilities at liquefied natural gas (LNG) storing and receiving terminals, whose failure may cause BOG loss and/or severe accidents. Operation of a BOG recondensation system requires sufficient care under various situations, especially when LNG load and BOG load fluctuate. This study improves the control algorithm for a BOG recondensation system at an LNG receiving terminal and employs dynamic simulations to examine its operation reliability and energy minimization. Key system parameters, such as recondenser pressure, liquid level, and high-pressure pump suction pressure are tracked during simulation. On the basis of process dynamic simulation by use of DYNSIM and analysis of tracked key system parameters, the developed control algorithm is verified as reliable and is expected to be applied to other LNG terminals.
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