A more detailed description on [Reforming + FT] sub-system can be referred to the process modelling for GTL in our prior work. This section only mentions some essential information related to this work. As shown in Figure , the [Reforming + FT] sub-system is modelled in Aspen Plus, including combined reforming, FT synthesis, and product upgrading section. This process starts with the combined reforming (CO2 + H2O) of natural gas to syngas, followed by FT synthesis for fuels. Since the upgrading section has little influence on the overall performance, we use a distillation column to simplify it. To deal with a petrochemical process, Peng-Robinson is selected as the thermodynamic method.