Management of liquefied natural gas

Abstract

The usage of natural gas has been rapidly increasing in the modern world. For logistical reasons, natural gas is only transported as liquid (LNG). Mathematical modelling allowed understanding and managing LNG ageing process during marine transport and processing on Floating Storage Units (FSU) and Floating Storage Regasification Unit (FSRU). The purpose of analyses was to investigate the changes of initial physical properties and chemical composition of LNG during its storage and regasification processes as well as factors that affect the ageing process. These include the daily changes in the content of methane and nitrogen as well as the calorific value and the Wobbe index. All models were verified using collected data of three different periods obtained from FSRU tanks measurement system to predict changes of physical properties and chemical composition of LNG following its maximum allowable storage period for 60 days. The created model could be useful in case of LNG market oversupply or with existing demand to storage LNG as a reserve.