Production of synthetic gasoline and diesel fuel by alternative processes using natural gas and coal: Process simulation and optimization

摘要

The problem of producing synthetic liquid fuels by alternative routes is addressed. Industrial processesrnknown as gas to liquid (GTL) and coal to liquid (CTL) are considered and compared to a hybrid processrnpresently developed, which combines features of both GTL and CTL.rnDetailed process models are developed. Based on simulations, it is shown that the fuel produced per unitrnof feedstock (weight basis, with a productivity of 100 t/h of synthetic fuels) are 66.7% and 32.5% for GTLrnand CTL, respectively, and that the CO_2 emitted per unit mass of liquid fuel is 0.63 kg CO_2/kg for GTL andrn4.66 kg CO_2/kg for CTL The hybrid process allows the production of 44.4% of fuel and to reduce CO_2rnemissions to 2.45 kg CO_2/kg liquid fuel.rnBy using pinch technology analysis (PTA) a heat integration of the hybrid process is carried out. From thernresults of PTA, no pinch point is found, a considerable amount of cooling water is needed, and thernresulting thermal efficiency is around 55%.