Basis for estimation of heat and mass balance and CO2 emissions in LNG plants
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The present work has been performed to provide initial estimations of the production rate, energy demand and CO2 emissions in early phase LNG plant projects. The model created has been developed to be implemented in Microsoft Excel, and focus has been given to the definition of simple expressions that could be applied in the mentioned spreadsheet software. The model has been defined for and objective accuracy of +/- 30% with respect to the reference data. The plant model has been split into different blocks which represent different processes in the plant, and each block has been modelled differently by using HYSYS simulations, real data and theoretical models. Six reference cases have been benchmarked against the model estimations for the LNG, LPG and Condensate production, liquefaction power and CO2 emissions from the feed gas and for the liquefaction power, electrical power and heat generation. Moreover, additional electrical power, heat duty and fuel gas flow rate estimations have been benchmarked against two of the reference cases. The representative estimations for the six reference cases present an accuracy range between -19% and +28%. The Condensate production estimation presents deviations between the reference and the predicted data outside of the +/-30% limit, and LPG production has been modelled for a single case with a deviation of -16%. Representative electrical power, heat duty and fuel flow rate estimations for cases A and B present relative error percentages between -10% and +25%.