Research on temperature variation algorithm in nitrogen pre-cooling LNG pipeline
In order to investigate the thermal behavior at the top and bottom sections of an LNG unloading pipeline during a nitrogen pre-cooling process,and to computationally predict these temperature variations,Fluent software was utilized to construct a three-dimensional model of an LNG pipeline with π-type expansion bend.The model was employed to simulate the temperature dynamics throughout the nitrogen pre-cooling phase of the LNG pipeline.A one-dimensional com-putational model for the nitrogen pre-cooling pipeline was developed,incorporated spatial and tem-poral discretization alongside iterative calculations for temporal and spatial domains.The analysis of factors influencing the thermal gradient between the top and bottom sections during the pipe-line's pre-cooling phase led to the derivation of an empirical correlation formula for theoretical temperature calculations.The numerical simulation results of the nitrogen pre-cooling LNG pipe-line were applied to fit this theoretical empirical correlation.Subsequent validation of this empiri-cal correlation with numerical simulation data demonstrated that,within the confines of the fitted data's sample space,the predictive error for the top and bottom temperatures during the pre-cool-ing process remains within 10％accuracy.
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