Research on Dynamic Simulation and Scheme Optimization of Nitrogen Replacement in LNG-FSRU Storage Tanks
Nitrogen replacement of tanks in Floating Storage and Regasification Units(FSRU)is one of the most important aspects before commissioning.Since FSRU requires nitrogen replacement for sev-eral tanks,the conventional replacement scheme has high nitrogen consumption.In order to reduce the waste of resources,based on the nitrogen reuse process,a tandem replacement optimization scheme is proposed,and the process flow of tandem replacement is given.The nitrogen replacement model of FSRU with multiple tanks is established and validated by using HYSYS dynamic simulation technology.Simultaneous replacement,single tank replacement,and four tandem replacement schemes are simulat-ed dynamically.The results show that the tandem replacement scheme can reduce the initial oxygen vol-ume fraction in the tank.After comparing and selecting various options,it is found that the most eco-nomical solution is the tandem replacement option 1,with a gas consumption of 286 tons and a re-placement time of 95 hours.Compared to simultaneous replacement and single tank replacement,this option can save 35%and 31%of nitrogen consumption,respectively.It can provide a reference for the development of FSRU multi-tank nitrogen replacement scheme.
FSRUstorage tanknitrogen replacementdynamic simulationscheme comparison and selection
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