Optimal Operation of Small LNG Refrigeration Cycles
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With the recent increases in the market of natural gas, new production alternatives have become available. One of these is the production in remote places. To increase the profit of this process, it is necessary to count with highly efficient transportation.The Mini-LNG alternative is an on-board refrigeration system that aims to minimize the gas loses. This work aimed to model and optimize the operation of it. Modelling and optimization were carried out using Malab. To model the fluid properties, Soave's modification of Redlich-Kwong equation of state. The solution of the model and properties was done using an equations-oriented approach. The approach followed the guidelines set up by Kamath. The model was optimized for a range of disturbances. The optimization problem was set up according to the plantwide control steps proposed by Skogestad. The chosen method was Matlab interior point. The solution of the nonlinear optimization problem provided sufficiently good results to account for the internal interactions of the system.