Optimization of Natural Gas Pressurized Liquefaction Process with C3MR Refrigeration and CO_2 Cryogenic Removal

摘要

The recovery of the otherwise flared offshore natural gas by means of LNG is drawing more and morernattention. However, offshore natural gas liquefaction faces many challenges, such as very limited space onrnthe offshore platform. This paper proposed a natural gas pressurized liquefaction process integrated with CO_2rncryogenic removal to realize smaller footprint. To minimize energy consumption, the composition, the flowrnrate, the high and low pressure in mixed refrigerant cycle is optimized by sequential search method with thernhelp of Aspen HYSYS. Moreover, the relationship between optimal MR composition and the feed gasrncomposition, the high and the low pressure is investigated. In addition, comparison study between thernproposed process and conventional C3MR process shows that the process is very suitable for offshore naturalrngas liquefaction for it is more spacing-saving and energy-saving.